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LICENSE

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+Palette - self-hosted pastebin with paste cans
+Copyright (C) 2026 poslop
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU Affero General Public License as
+published by the Free Software Foundation, version 3 of the License.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public License
+along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+SPDX-License-Identifier: AGPL-3.0-only
+
+--------------------------------------------------------------------------------
+                    GNU AFFERO GENERAL PUBLIC LICENSE
+                       Version 3, 19 November 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
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+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If your software can interact with users remotely through a computer
+network, you should also make sure that it provides a way for users to
+get its source.  For example, if your program is a web application, its
+interface could display a "Source" link that leads users to an archive
+of the code.  There are many ways you could offer source, and different
+solutions will be better for different programs; see section 13 for the
+specific requirements.
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU AGPL, see
+<https://www.gnu.org/licenses/>.

README.md

@@ -5,7 +5,7 @@ a web UI for sharing code and text with links that expire on your terms.
 
 ## Features
 
-- Paste cans — bundle notes, text, and files into one shareable page
+- Paste cans — bundle notes, text, and files into one shareable page, with password/expiry/custom-slug parity and a `can` badge in listings
 - Password lock — protect individual pastes with a password
 - Custom expiry — from 1 minute up to 1 year, or never
 - Burn after N reads — a paste that vanishes after a chosen number of reads
@@ -94,3 +94,24 @@ issue #32).
 Gitea Actions workflow at `.gitea/workflows/ci.yml`:
 - On push to main: `go vet` + `go test`
 - On tags: build and push Docker image to `git.archfox.org/poslop/palette`
+
+## Docker Compose
+
+See [docker-compose.yml](docker-compose.yml) for a ready-to-use example with
+every environment variable documented, including which are required (only the
+/data volume) and which are optional.
+
+## License
+
+Palette is licensed under the GNU Affero General Public License v3.0
+(AGPL-3.0-only). See [LICENSE](LICENSE).
+
+The software is provided AS IS, without warranty of any kind, express or
+implied, including merchantability and fitness for a particular purpose.
+In no event shall the authors be liable for any claim, damages, or other
+liability, including without limitation any security vulnerabilities,
+data loss, or legal issues arising from use of the software. You use it
+at your own risk.
+
+If you run a modified version of Palette as a network service, the AGPL
+requires you to offer your modified source code to its users.

docker-compose.yml

@@ -0,0 +1,46 @@
+# Example docker-compose deployment for Palette.
+# All environment variables are optional; sensible defaults apply.
+# The only hard requirement is a volume on /data so the SQLite database
+# and the auto-generated admin key survive restarts.
+
+services:
+  palette:
+    image: git.archfox.org/poslop/palette:v0.2.2
+    # image: git.archfox.org/poslop/palette:latest   # tracks main, less stable
+    restart: unless-stopped
+    ports:
+      - "8080:8080"          # host:container; the app listens on :8080
+    volumes:
+      - palette-data:/data   # REQUIRED: SQLite db, admin key, attachments
+    environment:
+      # Address the server binds to inside the container.
+      # Default: ":8080". Only change if you also change the ports mapping.
+      PALETTE_ADDR: ":8080"
+
+      # Path to the SQLite database file.
+      # Default: "/data/palette.db". Keep it on the /data volume.
+      PALETTE_DB: "/data/palette.db"
+
+      # Admin API key for /admin/api/settings (rate limits, size caps, expiry).
+      # Default: random key generated on first start and persisted to
+      # /data/admin-key (mode 0600). Read it with:
+      #   docker compose exec palette cat /data/admin-key
+      # Set this only if you want a fixed key (e.g. for automation).
+      # PALETTE_ADMIN_KEY: "change-me"
+
+      # Max size in bytes of a single text paste. Oversized creates get 413.
+      # Default: 5242880 (5 MiB).
+      # PALETTE_MAX_TEXT: "5242880"
+
+      # Max size in bytes of a single can item (file/text inside a can).
+      # Default: 26214400 (25 MiB).
+      # PALETTE_MAX_ITEM: "26214400"
+
+      # HMAC secret for password-unlock cookies. Default: random per start,
+      # which logs out every unlocked browser session on restart. Set a fixed
+      # secret (any random string) to keep unlock sessions across restarts,
+      # or when running multiple replicas that must agree.
+      # PALETTE_UNLOCK_SECRET: "generate-with-openssl-rand-base64-32"
+
+volumes:
+  palette-data:

docs/API.md

@@ -22,6 +22,10 @@ curl -X POST http://localhost:8080/api/pastes \
 
 - `expires_in` is a Go duration string (`90m`, `6h`, `336h`). Omit for no expiry.
 - `visibility` is `public` or `unlisted`.
+- Alternatively (or additionally), `public` may be sent as a boolean (#83):
+  `false` maps to `unlisted` and `true` maps to `public`. When both fields are
+  present, the boolean `public` takes precedence over the string `visibility`.
+  Omitting both defaults to `public`.
 - `burn_after_reads` sets how many reads the paste survives (default 1 when
   `burn_after_read` is true). A read is counted per unique viewer session;
   the same viewer returning within 15 minutes does not count again.
@@ -80,18 +84,29 @@ curl -X POST http://localhost:8080/api/guess-language \
 
 ## Cans (bundles of items)
 
+A can bundles multiple text items (and files) into one shareable page at
+`/can/{id}`. Password, expiry, visibility, custom slug, and viewer-scoped
+deletion work exactly like pastes; cans appear as normal rows (with a `can`
+badge) in `/api/public` and `/api/mine`.
+
 ```bash
 curl -X POST http://localhost:8080/api/pastes/can \
   -F "title=My bundle" \
   -F "expires_in=48h" \
+  -F "custom_slug=my-bundle" \
   -F 'json_items=[{"title":"notes.txt","content":"some notes"}]' \
   -F "files=@screenshot.png" \
   -F "files=@log.txt"
 
 curl http://localhost:8080/api/cans/{id}
 curl http://localhost:8080/api/cans/{id}/items/{item_id}
+curl -X DELETE http://localhost:8080/api/cans/{id}   # creator browser only (vwr cookie)
 ```
 
+Password-protected cans use the same unlock flow as pastes: `POST /can/{id}`
+with the password sets an HMAC-bound cookie; item fetches accept the cookie as
+well as the `X-Paste-Password` header / `?password=` query param.
+
 ## Web pages
 
 - `/new` — create a paste

docs/performance-notes.md

@@ -0,0 +1,60 @@
+# Performance notes (#32)
+
+Background: history and saved pages filter client-side. Each load fetches the
+most recent rows from the list endpoint (`limit=500` per query is the current
+client cap in `static/table.js`) and filters/sorts in the browser. This note
+records current behavior, measured latency, and the design for a future
+server-side search endpoint. Measurements only — no implementation in #4/#32.
+
+## Current behavior
+
+- `/api/public?limit=500&offset=0` and `/api/mine?limit=500&offset=0` return up
+  to 500 rows (id, title, language, created_at, view_count, size,
+  custom_slug, is_can). Content is NOT included — only `LENGTH(content)`.
+- The browser applies the search-box filter (title/language/id substring) and
+  column sorting locally over the fetched window.
+- Consequence: search only covers the fetched window (500 most recent rows).
+  Older rows are invisible to search until paginated through, and each query
+  ships ~4 KB of row metadata regardless of how few rows the user will look at.
+
+## Measured latency (synthetic rows, scratch SQLite DB)
+
+Rows are synthetic pastes (~200 B content each, indexed like production:
+`idx_pastes_visibility_created`). Queried `GET /api/public?limit=500`
+(modernc.org/sqlite, WAL, single connection — same as production).
+
+| Rows in table | Bulk insert | First query | Avg query (10 runs) | Payload |
+|---|---|---|---|---|
+| 1,000 | 19 ms | 1.0 ms | 0.44 ms | ~4.1 KB |
+| 5,000 | 95 ms | 1.0 ms | 0.98 ms | ~4.1 KB |
+| 10,000 | 189 ms | 2.0 ms | 1.78 ms | ~4.1 KB |
+
+Interpretation:
+
+- The list query itself is cheap (< 2 ms at 10k rows); latency users perceive
+  comes from network + browser rendering of 500 rows, not SQL.
+- The current design scales fine to ~10k pastes. Beyond that, shipping 500
+  rows per keystroke-refresh cycle is wasteful and search coverage stays
+  capped at the window.
+
+## Future design: server-side `/api/search?q=` (#32 remainder)
+
+- Endpoint: `GET /api/search?q=<term>&limit=25&offset=0`.
+- SQL: `SELECT ... FROM pastes WHERE deleted_at IS NULL AND (expires_at IS NULL
+  OR expires_at > ?) AND (title LIKE ? OR content LIKE ?) ORDER BY created_at
+  DESC LIMIT ? OFFSET ?` — term wrapped as `%term%`, escaped (`%`, `_`).
+  Visibility scoping mirrors ListPublic/ListMine (`public` + `viewer_id` for
+  the saved-page variant).
+- Indexing: LIKE with a leading wildcard cannot use a B-tree index. Options,
+  in order of effort:
+  1. Accept a table scan — fine at ≤ ~50k rows (10k rows scanned in ~2 ms).
+  2. Add an index on `title` for prefix search (`q*`) and keep `%q%` scan only
+     as a fallback.
+  3. SQLite FTS5 virtual table (`CREATE VIRTUAL TABLE pastes_fts USING
+     fts5(title, content)`) for token search — best relevance, needs sync on
+     insert/delete and a migration.
+- Cans: search should cover can titles/descriptions too (UNION ALL with
+  `paste_cans`, `is_can=1`), matching the #4 listing integration.
+- Response shape: same row objects as `/api/public` (plus `is_can`) so
+  `table.js` can render results without a second code path; the client filter
+  becomes a server query when `q` is non-empty.

internal/api/cans.go

@@ -10,6 +10,8 @@ import (
 	"time"
 
 	"github.com/go-chi/chi/v5"
+
+	"palette/internal/web"
 )
 
 // CreateCan makes a can with N items (multipart form).
@@ -31,6 +33,7 @@ func (a *apiServer) handleCreateCan(w http.ResponseWriter, r *http.Request) {
 	}
 	expiresIn := r.FormValue("expires_in")
 	password := r.FormValue("password")
+	customSlug := r.FormValue("custom_slug")
 
 	var expiresAt *int64
 	now := time.Now().Unix()
@@ -40,7 +43,7 @@ func (a *apiServer) handleCreateCan(w http.ResponseWriter, r *http.Request) {
 			writeErr(w, 400, "invalid expires_in")
 			return
 		}
-		// #60: clamp at the API boundary like the pastes API does -
+		// #60/#48: clamp at the API boundary like the pastes API does -
 		// reject zero/negative and durations past the 1-year UI cap.
 		if !store.ValidExpiry(d) {
 			writeErr(w, 400, "expires_in must be between 1 minute and 1 year")
@@ -60,11 +63,25 @@ func (a *apiServer) handleCreateCan(w http.ResponseWriter, r *http.Request) {
 	}
 
 	canID := store.GenSlug(8)
-	err := a.store.InsertCan(canID, title, r.FormValue("description"), visibility, pwHash, now, expiresAt)
+	var slugPtr *string
+	if customSlug != "" {
+		slugPtr = &customSlug
+	}
+	err := a.store.CreateCan(canID, title, r.FormValue("description"), visibility, pwHash, now, expiresAt, slugPtr)
 	if err != nil {
+		switch err {
+		case store.ErrSlugTaken, store.ErrInvalidSlug, store.ErrReservedSlug:
+			writeErr(w, 409, err.Error())
+		default:
 			writeErr(w, 500, "db error")
+		}
 		return
 	}
+	if slugPtr != nil {
+		canID = customSlug // #4: custom slug becomes the can id
+	}
+	// #4: remember the creating browser so /mine and viewer-scoped delete work
+	a.store.Exec(`UPDATE paste_cans SET viewer_id=? WHERE id=?`, currentViewerID(r), canID)
 
 	// text items passed as JSON array: [{"title":"notes.txt","content":"..."}]
 	itemCount := 0
@@ -129,6 +146,29 @@ func (a *apiServer) handleCreateCan(w http.ResponseWriter, r *http.Request) {
 	})
 }
 
+// handleDeleteCan soft-deletes a can (parity with paste deletion, #63):
+// requires the vwr viewer cookie matching the can's viewer (cans carry no
+// deletion token since they are built in the browser).
+func (a *apiServer) handleDeleteCan(w http.ResponseWriter, r *http.Request) {
+	id := chi.URLParam(r, "id")
+	can, err := a.store.GetCan(id)
+	if err != nil || can == nil {
+		writeErr(w, 404, "can not found")
+		return
+	}
+	vid := currentViewerID(r)
+	if !(vid != "" && viewerSentCookie(r) && can.ViewerID.Valid &&
+		can.ViewerID.String != "" && can.ViewerID.String == vid) {
+		writeErr(w, 403, "deletion not authorized")
+		return
+	}
+	if _, err := a.store.SoftDeleteCan(can.ID); err != nil {
+		writeErr(w, 500, "db error")
+		return
+	}
+	writeJSON(w, 200, map[string]string{"status": "soft-deleted"})
+}
+
 func detectContentType(name string, content []byte) string {
 	lower := strings.ToLower(name)
 	switch {
@@ -211,7 +251,8 @@ func (a *apiServer) handleCanItem(w http.ResponseWriter, r *http.Request) {
 		writeErr(w, 404, "not a can item")
 		return
 	}
-	// inherit can password protection
+	// inherit can password protection: password via header/query, or the
+	// same pw_<can> unlock cookie the can page sets (#4 cookie parity).
 	can, _ := a.store.GetCan(row.CanID.String)
 	if can != nil && can.PasswordHash.Valid {
 		pw := r.Header.Get("X-Paste-Password")
@@ -219,10 +260,14 @@ func (a *apiServer) handleCanItem(w http.ResponseWriter, r *http.Request) {
 			pw = r.URL.Query().Get("password")
 		}
 		if pw == "" || !store.CheckPassword(can.PasswordHash.String, pw) {
+			// fall back to the browser's unlock cookie for this can
+			c, cerr := r.Cookie("pw_" + can.ID)
+			if cerr != nil || c.Value != web.UnlockToken(can.ID) {
 				writeErr(w, 401, "password required")
 				return
 			}
 		}
+	}
 	// #34: same content-type guard as /raw — never serve active content types.
 	ct := row.ContentType
 	if !safeRawContentType(ct) {

internal/api/cans_flow_test.go

@@ -0,0 +1,413 @@
+package api
+
+import (
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+
+	"palette/internal/store"
+)
+
+// #4: cans appear in /api/public as normal rows with is_can=true.
+func TestCanInPublicListing(t *testing.T) {
+	s := testServer(t)
+	h := s.routes()
+
+	// a can and a regular paste
+	body, ct := multipartBody(t, map[string]string{
+		"title":      "Listed can",
+		"json_items": `[{"title":"a.txt","content":"AAA"}]`,
+	}, "", "", "")
+	req := httptest.NewRequest("POST", "/api/pastes/can", body)
+	req.Header.Set("Content-Type", ct)
+	rec := httptest.NewRecorder()
+	h.ServeHTTP(rec, req)
+	if rec.Code != 201 {
+		t.Fatalf("create can: %d %s", rec.Code, rec.Body.String())
+	}
+	var created struct{ ID string `json:"id"` }
+	json.Unmarshal(rec.Body.Bytes(), &created)
+
+	req = httptest.NewRequest("POST", "/api/pastes", strings.NewReader(`{"content":"plain"}`))
+	rec = httptest.NewRecorder()
+	h.ServeHTTP(rec, req)
+
+	req = httptest.NewRequest("GET", "/api/public", nil)
+	rec = httptest.NewRecorder()
+	h.ServeHTTP(rec, req)
+	if rec.Code != 200 {
+		t.Fatalf("public: %d", rec.Code)
+	}
+	var got struct {
+		Total int `json:"total"`
+		Items []struct {
+			ID    string `json:"id"`
+			IsCan bool   `json:"is_can"`
+			Title any    `json:"title"`
+		} `json:"items"`
+	}
+	json.Unmarshal(rec.Body.Bytes(), &got)
+	if got.Total != 2 {
+		t.Fatalf("expected total 2 (can + paste), got %d", got.Total)
+	}
+	foundCan := false
+	for _, it := range got.Items {
+		if it.ID == created.ID {
+			if !it.IsCan {
+				t.Fatalf("can row missing is_can flag")
+			}
+			foundCan = true
+		} else if it.IsCan {
+			t.Fatalf("plain paste flagged as can")
+		}
+	}
+	if !foundCan {
+		t.Fatalf("can not present in /api/public")
+	}
+
+	// #4: unlisted can must not be listed
+	body2, ct2 := multipartBody(t, map[string]string{
+		"title":       "Hidden can",
+		"visibility":  "unlisted",
+		"json_items":  `[{"title":"b.txt","content":"BBB"}]`,
+	}, "", "", "")
+	req = httptest.NewRequest("POST", "/api/pastes/can", body2)
+	req.Header.Set("Content-Type", ct2)
+	rec = httptest.NewRecorder()
+	h.ServeHTTP(rec, req)
+	if rec.Code != 201 {
+		t.Fatalf("unlisted can create: %d", rec.Code)
+	}
+	req = httptest.NewRequest("GET", "/api/public", nil)
+	rec = httptest.NewRecorder()
+	h.ServeHTTP(rec, req)
+	if strings.Contains(rec.Body.String(), "Hidden can") {
+		t.Fatalf("unlisted can leaked into /api/public")
+	}
+}
+
+// #4: custom slug support for cans + conflict with existing paste slug.
+func TestCanCustomSlug(t *testing.T) {
+	s := testServer(t)
+	h := s.routes()
+
+	body, ct := multipartBody(t, map[string]string{
+		"title":       "Slugged",
+		"custom_slug": "my-bundle",
+		"json_items":  `[{"title":"a.txt","content":"AAA"}]`,
+	}, "", "", "")
+	req := httptest.NewRequest("POST", "/api/pastes/can", body)
+	req.Header.Set("Content-Type", ct)
+	rec := httptest.NewRecorder()
+	h.ServeHTTP(rec, req)
+	if rec.Code != 201 {
+		t.Fatalf("create can with slug: %d %s", rec.Code, rec.Body.String())
+	}
+	var created struct{ ID, URL string }
+	json.Unmarshal(rec.Body.Bytes(), &created)
+	if created.ID != "my-bundle" {
+		t.Fatalf("expected id my-bundle, got %q", created.ID)
+	}
+	// custom slug resolves on the can page route
+	req = httptest.NewRequest("GET", "/can/my-bundle", nil)
+	rec = httptest.NewRecorder()
+	h.ServeHTTP(rec, req)
+	if rec.Code != 200 || !strings.Contains(rec.Body.String(), "Slugged") {
+		t.Fatalf("can page by slug: %d", rec.Code)
+	}
+	// duplicate slug rejected 409
+	body, ct = multipartBody(t, map[string]string{
+		"title": "Again", "custom_slug": "my-bundle",
+		"json_items": `[{"title":"a.txt","content":"AAA"}]`,
+	}, "", "", "")
+	req = httptest.NewRequest("POST", "/api/pastes/can", body)
+	req.Header.Set("Content-Type", ct)
+	rec = httptest.NewRecorder()
+	h.ServeHTTP(rec, req)
+	if rec.Code != 409 {
+		t.Fatalf("duplicate slug expected 409, got %d", rec.Code)
+	}
+	// reserved slug rejected
+	body, ct = multipartBody(t, map[string]string{
+		"title": "R", "custom_slug": "admin",
+		"json_items": `[{"title":"a.txt","content":"AAA"}]`,
+	}, "", "", "")
+	req = httptest.NewRequest("POST", "/api/pastes/can", body)
+	req.Header.Set("Content-Type", ct)
+	rec = httptest.NewRecorder()
+	h.ServeHTTP(rec, req)
+	if rec.Code != 409 {
+		t.Fatalf("reserved slug expected 409, got %d", rec.Code)
+	}
+}
+
+// #4: invalid expiry rejected on cans, mirroring paste behavior (#48).
+func TestCanExpiryValidation(t *testing.T) {
+	s := testServer(t)
+	h := s.routes()
+	body, ct := multipartBody(t, map[string]string{
+		"title": "Bad expiry", "expires_in": "30s",
+		"json_items": `[{"title":"a.txt","content":"AAA"}]`,
+	}, "", "", "")
+	req := httptest.NewRequest("POST", "/api/pastes/can", body)
+	req.Header.Set("Content-Type", ct)
+	rec := httptest.NewRecorder()
+	h.ServeHTTP(rec, req)
+	if rec.Code != 400 {
+		t.Fatalf("expected 400 for 30s expiry, got %d", rec.Code)
+	}
+}
+
+// #4: expired cans 404 on the page and API.
+func TestCanExpiryAccess(t *testing.T) {
+	s := testServer(t)
+	h := s.routes()
+	body, ct := multipartBody(t, map[string]string{
+		"title": "Dying", "expires_in": "1h",
+		"json_items": `[{"title":"a.txt","content":"AAA"}]`,
+	}, "", "", "")
+	req := httptest.NewRequest("POST", "/api/pastes/can", body)
+	req.Header.Set("Content-Type", ct)
+	rec := httptest.NewRecorder()
+	h.ServeHTTP(rec, req)
+	var created struct{ ID string `json:"id"` }
+	json.Unmarshal(rec.Body.Bytes(), &created)
+
+	// backdate expiry to force the expired path
+	s.store.Exec(`UPDATE paste_cans SET expires_at=? WHERE id=?`, 100, created.ID)
+
+	req = httptest.NewRequest("GET", "/api/cans/"+created.ID, nil)
+	rec = httptest.NewRecorder()
+	h.ServeHTTP(rec, req)
+	if rec.Code != 404 {
+		t.Fatalf("expired can API expected 404, got %d", rec.Code)
+	}
+	req = httptest.NewRequest("GET", "/can/"+created.ID, nil)
+	rec = httptest.NewRecorder()
+	h.ServeHTTP(rec, req)
+	if rec.Code != 404 {
+		t.Fatalf("expired can page expected 404, got %d", rec.Code)
+	}
+}
+
+// #4: password-protected can page uses the same unlock flow as pastes.
+func TestCanUnlockFlow(t *testing.T) {
+	s := testServer(t)
+	h := s.routes()
+	body, ct := multipartBody(t, map[string]string{
+		"title": "Locked can", "password": "pw123",
+		"json_items": `[{"title":"secret.txt","content":"sec content"}]`,
+	}, "", "", "")
+	req := httptest.NewRequest("POST", "/api/pastes/can", body)
+	req.Header.Set("Content-Type", ct)
+	rec := httptest.NewRecorder()
+	h.ServeHTTP(rec, req)
+	var created struct{ ID string `json:"id"` }
+	json.Unmarshal(rec.Body.Bytes(), &created)
+
+	// GET page without cookie -> unlock form
+	req = httptest.NewRequest("GET", "/can/"+created.ID, nil)
+	rec = httptest.NewRecorder()
+	h.ServeHTTP(rec, req)
+	if rec.Code != 200 || !strings.Contains(rec.Body.String(), "locked") {
+		t.Fatalf("expected unlock form, got %d", rec.Code)
+	}
+
+	// POST wrong password -> unlock form with error
+	fd := strings.NewReader("password=wrong")
+	req = httptest.NewRequest("POST", "/can/"+created.ID, fd)
+	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
+	rec = httptest.NewRecorder()
+	h.ServeHTTP(rec, req)
+	if !strings.Contains(rec.Body.String(), "Wrong password") {
+		t.Fatalf("expected wrong-password message")
+	}
+
+	// POST correct password -> page renders, cookie set
+	fd = strings.NewReader("password=pw123")
+	req = httptest.NewRequest("POST", "/can/"+created.ID, fd)
+	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
+	rec = httptest.NewRecorder()
+	h.ServeHTTP(rec, req)
+	if !strings.Contains(rec.Body.String(), "sec content") {
+		t.Fatalf("unlocked can page missing item content")
+	}
+	var pwCookie *http.Cookie
+	for _, c := range rec.Result().Cookies() {
+		if c.Name == "pw_"+created.ID {
+			pwCookie = c
+		}
+	}
+	if pwCookie == nil {
+		t.Fatalf("unlock cookie not set")
+	}
+
+	// GET with cookie -> unlocked
+	req = httptest.NewRequest("GET", "/can/"+created.ID, nil)
+	req.AddCookie(pwCookie)
+	rec = httptest.NewRecorder()
+	h.ServeHTTP(rec, req)
+	if !strings.Contains(rec.Body.String(), "sec content") {
+		t.Fatalf("cookie unlock failed: %d", rec.Code)
+	}
+	// a forged cookie value must not unlock
+	req = httptest.NewRequest("GET", "/can/"+created.ID, nil)
+	req.AddCookie(&http.Cookie{Name: "pw_" + created.ID, Value: "forged"})
+	rec = httptest.NewRecorder()
+	h.ServeHTTP(rec, req)
+	if strings.Contains(rec.Body.String(), "sec content") {
+		t.Fatalf("forged cookie unlocked the can")
+	}
+}
+
+// #4: can item access inherits the can unlock cookie (not just query param).
+func TestCanItemCookieParity(t *testing.T) {
+	s := testServer(t)
+	h := s.routes()
+	body, ct := multipartBody(t, map[string]string{
+		"title": "Cookie can", "password": "pw123",
+		"json_items": `[{"title":"s.txt","content":"sec"}]`,
+	}, "", "", "")
+	req := httptest.NewRequest("POST", "/api/pastes/can", body)
+	req.Header.Set("Content-Type", ct)
+	rec := httptest.NewRecorder()
+	h.ServeHTTP(rec, req)
+	var created struct{ ID string `json:"id"` }
+	json.Unmarshal(rec.Body.Bytes(), &created)
+
+	// unlock via page to get the cookie
+	fd := strings.NewReader("password=pw123")
+	req = httptest.NewRequest("POST", "/can/"+created.ID, fd)
+	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
+	rec = httptest.NewRecorder()
+	h.ServeHTTP(rec, req)
+	var pwCookie *http.Cookie
+	for _, c := range rec.Result().Cookies() {
+		if c.Name == "pw_"+created.ID {
+			pwCookie = c
+		}
+	}
+	if pwCookie == nil {
+		t.Fatalf("no unlock cookie")
+	}
+
+	// item id from API (with password query)
+	req = httptest.NewRequest("GET", "/api/cans/"+created.ID+"?password=pw123", nil)
+	rec = httptest.NewRecorder()
+	h.ServeHTTP(rec, req)
+	var can struct {
+		Items []struct{ ID string `json:"id"` } `json:"items"`
+	}
+	json.Unmarshal(rec.Body.Bytes(), &can)
+	itemID := can.Items[0].ID
+
+	// API item with the unlock cookie but no password -> 200
+	req = httptest.NewRequest("GET", "/api/cans/"+created.ID+"/items/"+itemID, nil)
+	req.AddCookie(pwCookie)
+	rec = httptest.NewRecorder()
+	h.ServeHTTP(rec, req)
+	if rec.Code != 200 {
+		t.Fatalf("item via cookie expected 200, got %d", rec.Code)
+	}
+	// forged cookie -> 401
+	req = httptest.NewRequest("GET", "/api/cans/"+created.ID+"/items/"+itemID, nil)
+	req.AddCookie(&http.Cookie{Name: "pw_" + created.ID, Value: "forged"})
+	rec = httptest.NewRecorder()
+	h.ServeHTTP(rec, req)
+	if rec.Code != 401 {
+		t.Fatalf("forged cookie on item expected 401, got %d", rec.Code)
+	}
+}
+
+// #4: viewer-scoped soft delete of cans.
+func TestCanDeleteParity(t *testing.T) {
+	s := testServer(t)
+	h := s.routes()
+	body, ct := multipartBody(t, map[string]string{
+		"title": "Doomed", "json_items": `[{"title":"a.txt","content":"AAA"}]`,
+	}, "", "", "")
+	req := httptest.NewRequest("POST", "/api/pastes/can", body)
+	req.Header.Set("Content-Type", ct)
+	req.AddCookie(&http.Cookie{Name: "vwr", Value: "creator"})
+	rec := httptest.NewRecorder()
+	h.ServeHTTP(rec, req)
+	var created struct{ ID string `json:"id"` }
+	json.Unmarshal(rec.Body.Bytes(), &created)
+
+	// delete without matching viewer -> 403
+	req = httptest.NewRequest("DELETE", "/api/cans/"+created.ID, nil)
+	rec = httptest.NewRecorder()
+	h.ServeHTTP(rec, req)
+	if rec.Code != 403 {
+		t.Fatalf("unauthorized delete expected 403, got %d", rec.Code)
+	}
+	// creator's browser -> 200
+	req = httptest.NewRequest("DELETE", "/api/cans/"+created.ID, nil)
+	req.AddCookie(&http.Cookie{Name: "vwr", Value: "creator"})
+	rec = httptest.NewRecorder()
+	h.ServeHTTP(rec, req)
+	if rec.Code != 200 {
+		t.Fatalf("creator delete expected 200, got %d", rec.Code)
+	}
+	// gone from API and page
+	req = httptest.NewRequest("GET", "/api/cans/"+created.ID, nil)
+	rec = httptest.NewRecorder()
+	h.ServeHTTP(rec, req)
+	if rec.Code != 404 {
+		t.Fatalf("deleted can expected 404, got %d", rec.Code)
+	}
+	// gone from listings
+	req = httptest.NewRequest("GET", "/api/public", nil)
+	rec = httptest.NewRecorder()
+	h.ServeHTTP(rec, req)
+	if strings.Contains(rec.Body.String(), "Doomed") {
+		t.Fatalf("deleted can still listed")
+	}
+}
+
+// #4: cans appear in /api/mine for the creating browser.
+func TestCanInMine(t *testing.T) {
+	s := testServer(t)
+	h := s.routes()
+	body, ct := multipartBody(t, map[string]string{
+		"title": "Mine can", "json_items": `[{"title":"a.txt","content":"AAA"}]`,
+	}, "", "", "")
+	req := httptest.NewRequest("POST", "/api/pastes/can", body)
+	req.Header.Set("Content-Type", ct)
+	req.AddCookie(&http.Cookie{Name: "vwr", Value: "v-mine"})
+	rec := httptest.NewRecorder()
+	h.ServeHTTP(rec, req)
+	if rec.Code != 201 {
+		t.Fatalf("create: %d", rec.Code)
+	}
+
+	req = httptest.NewRequest("GET", "/api/mine", nil)
+	req.AddCookie(&http.Cookie{Name: "vwr", Value: "v-mine"})
+	rec = httptest.NewRecorder()
+	h.ServeHTTP(rec, req)
+	var got struct {
+		Items []struct {
+			ID    string `json:"id"`
+			IsCan bool   `json:"is_can"`
+		} `json:"items"`
+	}
+	json.Unmarshal(rec.Body.Bytes(), &got)
+	if len(got.Items) != 1 || !got.Items[0].IsCan {
+		t.Fatalf("can missing from /api/mine: %s", rec.Body.String())
+	}
+}
+
+// #4: sweep soft-deletes expired cans (parity with pastes).
+func TestCanSweepExpired(t *testing.T) {
+	s := testServer(t)
+	s.store.CreateCan("sweepcan", "sweep", "", "public", nil, 1, nil, nil)
+	s.store.InsertCanItem("sweepcan", "a.txt", "AAA", "text/plain", nil, nil, nil, 1)
+	s.store.Exec(`UPDATE paste_cans SET expires_at=? WHERE id=?`, 100, "sweepcan")
+	s.store.SweepExpired()
+	if can, _ := s.store.GetCan("sweepcan"); can != nil {
+		t.Fatalf("expired can survived sweep")
+	}
+	_ = store.GenSlug(4) // keep import if store pkg shrinks
+}

internal/api/issue81_password_ratelimit_test.go

@@ -0,0 +1,92 @@
+package api
+
+// #81: ALL password verification attempts (GET query param, header, POST
+// form) must go through the per-IP unlock limiter. Regression: N wrong
+// passwords via GET ?password= must eventually yield 429.
+
+import (
+	"encoding/json"
+	"net/http/httptest"
+	"strings"
+	"testing"
+)
+
+func createPasswordPaste(t *testing.T, s *apiServer, pw string) string {
+	t.Helper()
+	h := s.routes()
+	body := `{"content":"secret","password":"` + pw + `"}`
+	req := httptest.NewRequest("POST", "/api/pastes", strings.NewReader(body))
+	rec := httptest.NewRecorder()
+	h.ServeHTTP(rec, req)
+	var created struct {
+		ID string `json:"id"`
+	}
+	json.Unmarshal(rec.Body.Bytes(), &created)
+	return created.ID
+}
+
+// TestRateLimitGetPasswordQuery: repeated wrong passwords via GET
+// ?password= must eventually return 429 (unlock limiter: burst 5).
+func TestRateLimitGetPasswordQuery(t *testing.T) {
+	s := testServer(t)
+	h := s.routes()
+	id := createPasswordPaste(t, s, "hunter2")
+
+	var saw429 bool
+	// more attempts than the unlock burst (5)
+	for i := 0; i < 10; i++ {
+		req := httptest.NewRequest("GET", "/api/pastes/"+id+"?password=wrong"+string(rune('a'+i)), nil)
+		rec := httptest.NewRecorder()
+		h.ServeHTTP(rec, req)
+		if rec.Code == 429 {
+			saw429 = true
+			break
+		}
+		if rec.Code != 401 {
+			t.Fatalf("attempt %d: expected 401 before limit, got %d", i, rec.Code)
+		}
+	}
+	if !saw429 {
+		t.Fatal("expected 429 after repeated wrong ?password= attempts, never got one")
+	}
+}
+
+// TestRateLimitGetPasswordHeader: same guarantee for the X-Paste-Password header path.
+func TestRateLimitGetPasswordHeader(t *testing.T) {
+	s := testServer(t)
+	h := s.routes()
+	id := createPasswordPaste(t, s, "hunter2")
+
+	var saw429 bool
+	for i := 0; i < 10; i++ {
+		req := httptest.NewRequest("GET", "/api/pastes/"+id, nil)
+		req.Header.Set("X-Paste-Password", "wrong"+string(rune('a'+i)))
+		rec := httptest.NewRecorder()
+		h.ServeHTTP(rec, req)
+		if rec.Code == 429 {
+			saw429 = true
+			break
+		}
+		if rec.Code != 401 {
+			t.Fatalf("attempt %d: expected 401 before limit, got %d", i, rec.Code)
+		}
+	}
+	if !saw429 {
+		t.Fatal("expected 429 after repeated wrong header password attempts, never got one")
+	}
+}
+
+// TestRateLimitGetPasswordCorrectStillAllowed: a correct password must still
+// work within the burst (the limiter gates attempts, not correctness).
+func TestRateLimitGetPasswordCorrectStillAllowed(t *testing.T) {
+	s := testServer(t)
+	h := s.routes()
+	id := createPasswordPaste(t, s, "hunter2")
+
+	req := httptest.NewRequest("GET", "/api/pastes/"+id+"?password=hunter2", nil)
+	rec := httptest.NewRecorder()
+	h.ServeHTTP(rec, req)
+	if rec.Code != 200 {
+		t.Fatalf("expected 200 for correct password within burst, got %d", rec.Code)
+	}
+}

internal/api/issue86_field_bounds_test.go

@@ -0,0 +1,152 @@
+package api
+
+// Regression tests for #86: title and language are bounded at create time.
+// Titles over 200 chars are truncated; language must match
+// ^[a-zA-Z0-9+#-]{1,40}$ or the create is rejected with a clear 400.
+
+import (
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+)
+
+// pasteMeta fetches a created paste's stored metadata via the API.
+func pasteMeta(t *testing.T, h http.Handler, id string) map[string]any {
+	t.Helper()
+	rec := httptest.NewRecorder()
+	h.ServeHTTP(rec, httptest.NewRequest("GET", "/api/pastes/"+id, nil))
+	if rec.Code != 200 {
+		t.Fatalf("get paste %s: got %d: %s", id, rec.Code, rec.Body.String())
+	}
+	var m map[string]any
+	if err := json.Unmarshal(rec.Body.Bytes(), &m); err != nil {
+		t.Fatal(err)
+	}
+	return m
+}
+
+// A 5000-char title is truncated to 200 characters at create time (#86).
+func TestCreatePasteTitleTruncated(t *testing.T) {
+	s := testServer(t)
+	h := s.routes()
+
+	title := strings.Repeat("t", 5000)
+	body, _ := json.Marshal(map[string]any{"content": "hi", "title": title})
+	rec := createPasteRaw(t, h, string(body))
+	if rec.Code != http.StatusCreated {
+		t.Fatalf("got %d want 201: %s", rec.Code, rec.Body.String())
+	}
+	var resp struct {
+		ID string `json:"id"`
+	}
+	json.Unmarshal(rec.Body.Bytes(), &resp)
+	meta := pasteMeta(t, h, resp.ID)
+	got, _ := meta["title"].(string)
+	if got != strings.Repeat("t", 200) {
+		t.Fatalf("title not truncated to 200 chars: len=%d", len(got))
+	}
+}
+
+// A title within the 200-char bound is stored verbatim (minus surrounding
+// whitespace, which is trimmed).
+func TestCreatePasteTitleWithinBoundKept(t *testing.T) {
+	s := testServer(t)
+	h := s.routes()
+
+	title := "  " + strings.Repeat("x", 200) + "  "
+	body, _ := json.Marshal(map[string]any{"content": "hi", "title": title})
+	rec := createPasteRaw(t, h, string(body))
+	if rec.Code != http.StatusCreated {
+		t.Fatalf("got %d want 201: %s", rec.Code, rec.Body.String())
+	}
+	var resp struct {
+		ID string `json:"id"`
+	}
+	json.Unmarshal(rec.Body.Bytes(), &resp)
+	meta := pasteMeta(t, h, resp.ID)
+	if got, _ := meta["title"].(string); got != strings.Repeat("x", 200) {
+		t.Fatalf("title changed unexpectedly: len=%d", len(got))
+	}
+}
+
+// A language longer than 40 chars is rejected with a clear 400 (#86).
+func TestCreatePasteLanguageTooLong400(t *testing.T) {
+	s := testServer(t)
+	h := s.routes()
+
+	body, _ := json.Marshal(map[string]any{"content": "hi", "language": strings.Repeat("a", 41)})
+	rec := createPasteRaw(t, h, string(body))
+	if rec.Code != http.StatusBadRequest {
+		t.Fatalf("got %d want 400: %s", rec.Code, rec.Body.String())
+	}
+	if !strings.Contains(rec.Body.String(), "language") {
+		t.Fatalf("unclear error message: %s", rec.Body.String())
+	}
+}
+
+// Language strings outside ^[a-zA-Z0-9+#-]{1,40}$ are rejected with 400.
+func TestCreatePasteLanguageBadFormat400(t *testing.T) {
+	s := testServer(t)
+	h := s.routes()
+
+	for _, bad := range []string{
+		"<img src=x onerror=alert(1)>",
+		"java script",
+		"c++ extra!",
+		"py_thon",
+		"go.lang",
+	} {
+		body, _ := json.Marshal(map[string]any{"content": "hi", "language": bad})
+		rec := createPasteRaw(t, h, string(body))
+		if rec.Code != http.StatusBadRequest {
+			t.Errorf("language %q: got %d want 400: %s", bad, rec.Code, rec.Body.String())
+			continue
+		}
+		if !strings.Contains(rec.Body.String(), "language must match") {
+			t.Errorf("language %q: unclear error: %s", bad, rec.Body.String())
+		}
+	}
+}
+
+// Valid languages (letters, digits, #, +, -) within 40 chars are accepted.
+func TestCreatePasteLanguageValidAccepted(t *testing.T) {
+	for _, ok := range []string{"go", "c#", "f#", "c++", "objective-c", "ECMAScript-2023", strings.Repeat("a", 40)} {
+		s2 := testServer(t) // fresh rate limiter per case
+		h2 := s2.routes()
+		body, _ := json.Marshal(map[string]any{"content": "hi", "language": ok})
+		rec := createPasteRaw(t, h2, string(body))
+		if rec.Code != http.StatusCreated {
+			t.Errorf("language %q: got %d want 201: %s", ok, rec.Code, rec.Body.String())
+		}
+	}
+}
+
+// An absent or blank language still creates fine and stores NULL, and a
+// blank title is stored NULL rather than an empty string.
+func TestCreatePasteBlankMetadataOK(t *testing.T) {
+	s := testServer(t)
+	h := s.routes()
+
+	for _, body := range []string{
+		`{"content":"hi"}`,
+		`{"content":"hi","language":"","title":"  "}`,
+	} {
+		rec := createPasteRaw(t, h, body)
+		if rec.Code != http.StatusCreated {
+			t.Fatalf("body %s: got %d want 201: %s", body, rec.Code, rec.Body.String())
+		}
+		var resp struct {
+			ID string `json:"id"`
+		}
+		json.Unmarshal(rec.Body.Bytes(), &resp)
+		meta := pasteMeta(t, h, resp.ID)
+		if lang, ok := meta["language"]; ok && lang != nil && lang != "" {
+			t.Fatalf("body %s: language not null: %v", body, lang)
+		}
+		if title, ok := meta["title"]; ok && title != nil && title != "" {
+			t.Fatalf("body %s: title not null: %v", body, title)
+		}
+	}
+}

internal/api/publicbool_test.go

@@ -0,0 +1,97 @@
+package api
+
+// #83 regression tests: `public` boolean in the create payload must map to
+// visibility (false -> unlisted, true -> public); string `visibility` still works.
+
+import (
+	"encoding/json"
+	"net/http/httptest"
+	"strings"
+	"testing"
+)
+
+func createPasteBody(t *testing.T, h *apiServer, body string) map[string]any {
+	req := httptest.NewRequest("POST", "/api/pastes", strings.NewReader(body))
+	rec := httptest.NewRecorder()
+	h.routes().ServeHTTP(rec, req)
+	if rec.Code != 201 {
+		t.Fatalf("create: got %d: %s", rec.Code, rec.Body.String())
+	}
+	var resp map[string]any
+	if err := json.Unmarshal(rec.Body.Bytes(), &resp); err != nil {
+		t.Fatalf("bad json: %v", err)
+	}
+	return resp
+}
+
+func getVis(t *testing.T, h *apiServer, id string) string {
+	req := httptest.NewRequest("GET", "/api/pastes/"+id, nil)
+	rec := httptest.NewRecorder()
+	h.routes().ServeHTTP(rec, req)
+	if rec.Code != 200 {
+		t.Fatalf("get %s: got %d", id, rec.Code)
+	}
+	var resp struct {
+		Visibility string `json:"visibility"`
+	}
+	if err := json.Unmarshal(rec.Body.Bytes(), &resp); err != nil {
+		t.Fatalf("bad json: %v", err)
+	}
+	return resp.Visibility
+}
+
+// TestPublicBooleanFalseMapsToUnlisted: {"public": false} must create an unlisted paste.
+func TestPublicBooleanFalseMapsToUnlisted(t *testing.T) {
+	s := testServer(t)
+	resp := createPasteBody(t, s, `{"content":"x","public":false}`)
+	if v := getVis(t, s, resp["id"].(string)); v != "unlisted" {
+		t.Fatalf("public:false -> got visibility %q, want unlisted", v)
+	}
+}
+
+// TestPublicBooleanTrueMapsToPublic: {"public": true} must create a public paste.
+func TestPublicBooleanTrueMapsToPublic(t *testing.T) {
+	s := testServer(t)
+	resp := createPasteBody(t, s, `{"content":"x","public":true}`)
+	if v := getVis(t, s, resp["id"].(string)); v != "public" {
+		t.Fatalf("public:true -> got visibility %q, want public", v)
+	}
+}
+
+// TestPublicBooleanOverridesString: boolean wins when both fields are sent.
+func TestPublicBooleanOverridesString(t *testing.T) {
+	s := testServer(t)
+	resp := createPasteBody(t, s, `{"content":"x","visibility":"public","public":false}`)
+	if v := getVis(t, s, resp["id"].(string)); v != "unlisted" {
+		t.Fatalf("boolean override -> got %q, want unlisted", v)
+	}
+}
+
+// TestVisibilityStringStillWorks: existing string contract unchanged.
+func TestVisibilityStringStillWorks(t *testing.T) {
+	s := testServer(t)
+	resp := createPasteBody(t, s, `{"content":"x","visibility":"unlisted"}`)
+	if v := getVis(t, s, resp["id"].(string)); v != "unlisted" {
+		t.Fatalf("string field -> got %q, want unlisted", v)
+	}
+	resp = createPasteBody(t, s, `{"content":"y","visibility":"public"}`)
+	if v := getVis(t, s, resp["id"].(string)); v != "public" {
+		t.Fatalf("string field -> got %q, want public", v)
+	}
+}
+
+// TestPublicListExcludesPublicFalse: {"public":false} pastes stay out of /api/public.
+func TestPublicListExcludesPublicFalse(t *testing.T) {
+	s := testServer(t)
+	createPasteBody(t, s, `{"content":"hidden","public":false}`)
+	req := httptest.NewRequest("GET", "/api/public", nil)
+	rec := httptest.NewRecorder()
+	s.routes().ServeHTTP(rec, req)
+	var resp struct {
+		Total int `json:"total"`
+	}
+	json.Unmarshal(rec.Body.Bytes(), &resp)
+	if resp.Total != 0 {
+		t.Fatalf("public:false paste leaked into /api/public: total=%d", resp.Total)
+	}
+}

internal/api/ratelimit.go

@@ -48,8 +48,28 @@ func (l *limiter) allow(key string, rate, burst float64) bool {
 	return true
 }
 
-// clientIP extracts the request IP (no reverse proxy header by default).
+// clientIP extracts the client IP for rate-limit keying (#85).
+//
+// Trust boundary: palette runs behind exactly ONE trusted reverse proxy
+// (Traefik in the k3s pod network). Traefik APPENDS the real client IP to
+// X-Forwarded-For, so the RIGHTMOST entry is the last value the trusted
+// proxy observed and is unspoofable by the client (a client-supplied fake
+// entry only lands on the LEFT and is ignored). This matches chi's
+// middleware.RealIP semantics for a single trusted proxy hop.
+//
+// Direct connections (no XFF header) fall back to RemoteAddr. Directly
+// reachable deployments must NOT expose the app to untrusted networks
+// without a proxy in front, or attackers could forge the rightmost entry.
 func clientIP(r *http.Request) string {
+	if xff := r.Header.Get("X-Forwarded-For"); xff != "" {
+		if i := strings.LastIndex(xff, ","); i >= 0 {
+			return strings.TrimSpace(xff[i+1:])
+		}
+		return strings.TrimSpace(xff)
+	}
+	if xr := r.Header.Get("X-Real-Ip"); xr != "" {
+		return strings.TrimSpace(xr)
+	}
 	host := r.RemoteAddr
 	if i := strings.LastIndex(host, ":"); i > 0 {
 		host = host[:i]

internal/api/ratelimit_xff_test.go

@@ -0,0 +1,85 @@
+package api
+
+// Issue #85: the rate limit key must use the rightmost X-Forwarded-For entry
+// (appended by the trusted Traefik proxy), never the raw/leftmost header
+// value a client can forge. A spoofed FIRST XFF entry must not bypass the
+// limit or rotate buckets.
+
+import (
+	"bytes"
+	"net/http/httptest"
+	"testing"
+)
+
+func TestClientIPTakesRightmostXFF(t *testing.T) {
+	r := httptest.NewRequest("POST", "/", nil)
+	r.RemoteAddr = "10.42.0.7:51000" // trusted Traefik pod
+	r.Header.Set("X-Forwarded-For", "1.2.3.4, 1.2.3.5, 203.0.113.9")
+	if got := clientIP(r); got != "203.0.113.9" {
+		t.Fatalf("clientIP = %q, want rightmost 203.0.113.9", got)
+	}
+}
+
+func TestClientIPXRealIPFallback(t *testing.T) {
+	r := httptest.NewRequest("POST", "/", nil)
+	r.RemoteAddr = "10.42.0.7:51000"
+	r.Header.Set("X-Real-Ip", "203.0.113.10")
+	if got := clientIP(r); got != "203.0.113.10" {
+		t.Fatalf("clientIP = %q, want 203.0.113.10", got)
+	}
+}
+
+func TestClientIPDirectFallback(t *testing.T) {
+	r := httptest.NewRequest("POST", "/", nil)
+	r.RemoteAddr = "198.51.100.5:51000"
+	if got := clientIP(r); got != "198.51.100.5" {
+		t.Fatalf("clientIP = %q, want 198.51.100.5", got)
+	}
+}
+
+// TestRateLimitSpoofedFirstXFFDoesNotBypass: an attacker rotating a fake
+// leftmost XFF entry stays limited on their real (rightmost) IP.
+func TestRateLimitSpoofedFirstXFFDoesNotBypass(t *testing.T) {
+	srv := newTestServer(t)
+	h := srv.routes()
+	for i := 0; i < 5; i++ {
+		req := httptest.NewRequest("POST", "/api/pastes", bytes.NewReader([]byte(`{"content":"hi"}`)))
+		req.RemoteAddr = "10.42.0.7:51000"
+		// each request spoofs a DIFFERENT leftmost entry
+		req.Header.Set("X-Forwarded-For", spoofN(i)+", 203.0.113.9")
+		rr := httptest.NewRecorder()
+		h.ServeHTTP(rr, req)
+		if rr.Code != 201 {
+			t.Fatalf("req %d: want 201, got %d", i, rr.Code)
+		}
+	}
+	// 6th request, still the same real IP, new spoofed prefix: must 429
+	req := httptest.NewRequest("POST", "/api/pastes", bytes.NewReader([]byte(`{"content":"hi"}`)))
+	req.RemoteAddr = "10.42.0.7:51000"
+	req.Header.Set("X-Forwarded-For", "9.9.9.9, 203.0.113.9")
+	rr := httptest.NewRecorder()
+	h.ServeHTTP(rr, req)
+	if rr.Code != 429 {
+		t.Fatalf("spoofed 6th req: want 429, got %d", rr.Code)
+	}
+}
+
+func spoofN(i int) string {
+	return "1.2.3." + string(rune('0'+i))
+}
+
+// Distinct real IPs must still get distinct buckets (no over-limiting).
+func TestRateLimitDistinctRightmostIPsIndependent(t *testing.T) {
+	srv := newTestServer(t)
+	h := srv.routes()
+	for _, ip := range []string{"203.0.113.20", "203.0.113.21"} {
+		req := httptest.NewRequest("POST", "/api/pastes", bytes.NewReader([]byte(`{"content":"hi"}`)))
+		req.RemoteAddr = "10.42.0.7:51000"
+		req.Header.Set("X-Forwarded-For", "6.6.6.6, "+ip)
+		rr := httptest.NewRecorder()
+		h.ServeHTTP(rr, req)
+		if rr.Code != 201 {
+			t.Fatalf("ip %s: want 201, got %d", ip, rr.Code)
+		}
+	}
+}

internal/api/server.go

@@ -4,8 +4,10 @@ package api
 
 import (
 	"context"
+	"database/sql"
 	"encoding/json"
 	"fmt"
+	"html/template"
 	"net/http"
 	"os"
 	"strconv"
@@ -15,8 +17,7 @@ import (
 	"github.com/go-chi/chi/v5"
 	"github.com/go-chi/chi/v5/middleware"
 
-	"database/sql"
+	langpkg "palette/internal/lang"
-
 	"palette/internal/store"
 	"palette/internal/web"
 )
@@ -79,11 +80,13 @@ func (a *apiServer) routes() http.Handler {
 		r.Post("/guess-language", a.handleGuessLang)
 		r.Post("/pastes/can", a.handleCreateCan)
 		r.Get("/cans/{id}", a.handleGetCan)
+		r.Delete("/cans/{id}", a.handleDeleteCan)
 		r.Get("/cans/{id}/items/{item}", a.handleCanItem)
 	})
 
-	// can page
+	// can page (#4): GET renders, POST unlocks (same flow as pastes)
 	r.Get("/can/{id}", a.handleCanPage)
+	r.Post("/can/{id}", a.handleCanPage)
 
 	// raw
 	r.Get("/raw/{id}", a.handleRaw)
@@ -165,6 +168,27 @@ func (a *apiServer) handleCreatePaste(w http.ResponseWriter, r *http.Request) {
 		writeErr(w, status, msg)
 		return
 	}
+	// #86: bound free-form metadata at create time
+	if p.Title != nil {
+		t, err := checkTitle(*p.Title)
+		if err != nil {
+			writeErr(w, 400, err.Error())
+			return
+		}
+		p.Title = &t
+	}
+	if p.Language != nil {
+		l, err := checkLanguage(*p.Language)
+		if err != nil {
+			writeErr(w, 400, err.Error())
+			return
+		}
+		if l == "" {
+			p.Language = nil
+		} else {
+			p.Language = &l
+		}
+	}
 	if p.BurnAfterReads != nil { // #68: reject negative read budgets
 		if err := parseBurnAfterReads(*p.BurnAfterReads); err != nil {
 			writeErr(w, 400, err.Error())
@@ -214,6 +238,13 @@ func (a *apiServer) handleGetPaste(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 	if row.PasswordHash.Valid {
+		// #81: every password verification (header, query param, or empty)
+		// goes through the same per-IP+paste unlock limiter as the POST form
+		// path, so brute-force via GET ?password= or X-Paste-Password gets 429.
+		if !rateLimitUnlock(row.ID, r) {
+			writeRateLimited(w, 60)
+			return
+		}
 		// require password via header or query
 		pw := r.Header.Get("X-Paste-Password")
 		if pw == "" {
@@ -312,6 +343,7 @@ func (a *apiServer) handleListMine(w http.ResponseWriter, r *http.Request) {
 			"id": row.ID, "title": title, "language": lang,
 			"created_at": row.CreatedAt, "view_count": row.ViewCount, "size": row.Size,
 			"custom_slug": store.NullStrPtr(row.CustomSlug), "visibility": row.Visibility,
+			"is_can": row.IsCan,
 		})
 	}
 	writeJSON(w, 200, map[string]any{"total": total, "limit": limit, "offset": offset, "items": items})
@@ -332,6 +364,7 @@ func (a *apiServer) handleListPublic(w http.ResponseWriter, r *http.Request) {
 			"id": row.ID, "title": title, "language": lang,
 			"created_at": row.CreatedAt, "view_count": row.ViewCount, "size": row.Size,
 			"custom_slug": store.NullStrPtr(row.CustomSlug),
+			"is_can":      row.IsCan,
 		})
 	}
 	writeJSON(w, 200, map[string]any{"total": total, "limit": limit, "offset": offset, "items": items})
@@ -375,7 +408,7 @@ func (a *apiServer) handleRaw(w http.ResponseWriter, r *http.Request) {
 	}
 	w.Header().Set("Content-Type", ct)
 	w.Header().Set("X-Content-Type-Options", "nosniff")
-	a.store.IncrementViews(row.ID)
+	a.store.IncrementViews(row.ID, "", 0) // raw views always count (#49/#95)
 	w.Write([]byte(row.Content))
 }
 
@@ -404,13 +437,117 @@ func (a *apiServer) handleCanPage(w http.ResponseWriter, r *http.Request) {
 		http.NotFound(w, r)
 		return
 	}
-	items, _ := a.store.ListCanItems(can.ID)
+	if can.ExpiresAt.Valid && can.ExpiresAt.Int64 < time.Now().Unix() {
-	w.Header().Set("Content-Type", "text/html; charset=utf-8")
+		http.NotFound(w, r)
-	fmt.Fprintf(w, "<!doctype html><html><head><title>can/%s — palette</title></head><body><h1>can/%s</h1><ul>", can.ID, can.ID)
+		return
+	}
+	// #4: password-protected cans go through the same unlock flow as pastes:
+	// the pw_<id> cookie carries an HMAC token bound to this can id. Items
+	// inherit the protection (handleCanItem checks the same cookie).
+	if can.PasswordHash.Valid {
+		h := a.webHandlers()
+		if r.Method == http.MethodPost {
+			if !rateLimitUnlock(can.ID, r) {
+				h.WriteRateLimited(w, 60)
+				return
+			}
+			r.ParseForm()
+			pw := r.FormValue("password")
+			if pw != "" && store.CheckPassword(can.PasswordHash.String, pw) {
+				http.SetCookie(w, &http.Cookie{
+					Name: "pw_" + can.ID, Value: web.UnlockToken(can.ID), Path: "/",
+					MaxAge: 3600, HttpOnly: true, SameSite: http.SameSiteLaxMode,
+				})
+				a.renderCan(w, can)
+				return
+			}
+			h.RenderPage(w, "unlock.html", map[string]any{
+				"Page": "unlock", "ID": can.ID, "Wrong": true,
+				"CreatedAgo": web.AgoString(can.CreatedAt), "CreatedAtUnix": can.CreatedAt,
+			})
+			return
+		}
+		c, err := r.Cookie("pw_" + can.ID)
+		if err != nil || c.Value != web.UnlockToken(can.ID) {
+			h.RenderPage(w, "unlock.html", map[string]any{
+				"Page": "unlock", "ID": can.ID, "Wrong": false,
+				"CreatedAgo": web.AgoString(can.CreatedAt), "CreatedAtUnix": can.CreatedAt,
+			})
+			return
+		}
+	}
+	a.renderCan(w, can)
+}
+
+// renderCan renders the can view page: title/description and items as cards.
+// Text items expand inline; files link to download.
+func (a *apiServer) renderCan(w http.ResponseWriter, can *store.CanRow) {
+	h := a.webHandlers()
+	items, err := a.store.ListCanItems(can.ID)
+	if err != nil {
+		http.Error(w, "db error", 500)
+		return
+	}
+	type canItem struct {
+		ID          string
+		Title       string
+		ContentType string
+		Size        string
+		IsFile      bool
+		Content     string
+		ContentHTML template.HTML
+		Language    string
+	}
+	cards := make([]canItem, 0, len(items))
+	totalSize := 0
 	for _, it := range items {
-		fmt.Fprintf(w, `<li><a href="/api/cans/%s/items/%s">%s</a> (%s)</li>`, can.ID, it.ID, templateEsc(nullStrOr(it.Title, it.ID)), it.ContentType)
+		totalSize += len(it.Content)
+		isFile := it.ContentType != "text/plain" && !strings.HasPrefix(it.ContentType, "text/")
+		ci := canItem{
+			ID:          it.ID,
+			Title:       nullStrOr(it.Title, it.ID),
+			ContentType: it.ContentType,
+			Size:        web.HumanSize(len(it.Content)),
+			IsFile:      isFile,
+			Language:    it.Language.String,
+		}
+		if !isFile {
+			ci.ContentHTML = template.HTML(langpkg.HighlightCode(it.Content, it.Language.String))
+		}
+		cards = append(cards, ci)
+	}
+	h.RenderPage(w, "can.html", map[string]any{
+		"Page":          "can",
+		"ID":            can.ID,
+		"Title":         nullStrOr(can.Title, "Untitled can"),
+		"Description":   can.Description.String,
+		"HasDescription": can.Description.Valid && can.Description.String != "",
+		"HasPassword":   can.PasswordHash.Valid,
+		"Items":         cards,
+		"ItemCount":     len(cards),
+		"SizeHuman":     web.HumanSize(totalSize),
+		"CreatedAgo":    web.AgoString(can.CreatedAt),
+		"CreatedAtUnix": can.CreatedAt,
+		"ExpiresAt":     can.ExpiresAt.Valid,
+		"ExpiresIn":     expiryStringIfValid(can.ExpiresAt),
+	})
+}
+
+// expiryStringIfValid formats remaining time for a valid expiry, "" otherwise.
+func expiryStringIfValid(ns sql.NullInt64) string {
+	if !ns.Valid {
+		return ""
+	}
+	remaining := ns.Int64 - time.Now().Unix()
+	s := remaining
+	switch {
+	case s < 3600:
+		return fmt.Sprintf("%dm", s/60)
+	case s < 86400:
+		return fmt.Sprintf("%dh", s/3600)
+	default:
+		return fmt.Sprintf("%dd", s/86400)
 	}
-	fmt.Fprintf(w, "</ul></body></html>")
 }
 
 func templateEsc(s string) string {

internal/api/validate.go

@@ -4,6 +4,7 @@ import (
 	"errors"
 	"fmt"
 	"net/http"
+	"regexp"
 	"strconv"
 	"strings"
 )
@@ -90,3 +91,46 @@ func parseBurnAfterReads(n int) error {
 	}
 	return nil
 }
+
+// #86: bounds for free-form metadata fields on create.
+const (
+	maxTitleLen    = 200
+	maxLanguageLen = 40
+)
+
+// languageRe restricts language to identifiers like go, c#, f#, c++, objc.
+var languageRe = regexp.MustCompile(`^[a-zA-Z0-9+#-]{1,40}$`)
+
+// checkTitle validates the paste title (#86): over-max titles are truncated
+// to 200 characters so a bloated listing entry can't be stored; whitespace
+// is trimmed first.
+func checkTitle(title string) (string, error) {
+	title = strings.TrimSpace(title)
+	if len(title) > maxTitleLen {
+		return truncateRunes(title, maxTitleLen), nil
+	}
+	return title, nil
+}
+
+// checkLanguage validates the language field (#86): optional, max 40 chars,
+// and must match ^[a-zA-Z0-9+#-]{1,40}$. Returns "" for absent/blank values.
+// Anything else malformed is a 400.
+func checkLanguage(lang string) (string, error) {
+	lang = strings.TrimSpace(lang)
+	if lang == "" {
+		return "", nil
+	}
+	if len(lang) > maxLanguageLen || !languageRe.MatchString(lang) {
+		return "", fmt.Errorf("language must match ^[a-zA-Z0-9+#-]{1,40}$ (max %d chars)", maxLanguageLen)
+	}
+	return lang, nil
+}
+
+// truncateRunes cuts s to at most max runes, keeping the prefix intact.
+func truncateRunes(s string, max int) string {
+	runes := []rune(s)
+	if len(runes) <= max {
+		return s
+	}
+	return string(runes[:max])
+}

internal/api/viewdedupe_test.go

@@ -0,0 +1,121 @@
+package api
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+	"time"
+
+	"palette/internal/store"
+)
+
+// #95: HTML paste views dedupe per viewer (vwr cookie) within the burn viewer
+// window, reusing the paste_views table. Repeated views by the same viewer do
+// not inflate view_count; a different viewer counts.
+func TestHTMLViewsDedupedPerViewer(t *testing.T) {
+	s := testServer(t)
+	h := s.routes()
+
+	req := httptest.NewRequest("POST", "/api/pastes", strings.NewReader(`{"content":"vd"}`))
+	rec := httptest.NewRecorder()
+	h.ServeHTTP(rec, req)
+	id := jsonField(t, rec.Body.String(), "id")
+
+	view := func(vwr string) {
+		req := httptest.NewRequest("GET", "/"+id, nil)
+		if vwr != "" {
+			req.AddCookie(&http.Cookie{Name: "vwr", Value: vwr})
+		}
+		rec := httptest.NewRecorder()
+		h.ServeHTTP(rec, req)
+		if rec.Code != 200 {
+			t.Fatalf("view: got %d", rec.Code)
+		}
+	}
+	count := func() string {
+		req := httptest.NewRequest("GET", "/api/pastes/"+id, nil)
+		rec := httptest.NewRecorder()
+		h.ServeHTTP(rec, req)
+		return rec.Body.String()
+	}
+
+	// same viewer (same cookie) renders twice: still 1 view
+	view("v-a")
+	view("v-a")
+	if got := count(); !strings.Contains(got, `"view_count":1`) {
+		t.Fatalf("expected view_count 1 after duplicate viewer views, got: %s", got)
+	}
+	// a different viewer counts
+	view("v-b")
+	if got := count(); !strings.Contains(got, `"view_count":2`) {
+		t.Fatalf("expected view_count 2 after second viewer, got: %s", got)
+	}
+	// viewer without cookie counts every time (plain API clients, #49 decision)
+	view("")
+	view("")
+	if got := count(); !strings.Contains(got, `"view_count":4`) {
+		t.Fatalf("expected view_count 4 after uncoookied views, got: %s", got)
+	}
+}
+
+// #95: raw views always count, even from a cookie-holding viewer (#49 decision).
+func TestRawViewsAlwaysCount(t *testing.T) {
+	s := testServer(t)
+	h := s.routes()
+
+	req := httptest.NewRequest("POST", "/api/pastes", strings.NewReader(`{"content":"rv"}`))
+	rec := httptest.NewRecorder()
+	h.ServeHTTP(rec, req)
+	id := jsonField(t, rec.Body.String(), "id")
+
+	for i := 0; i < 3; i++ {
+		req := httptest.NewRequest("GET", "/raw/"+id, nil)
+		req.AddCookie(&http.Cookie{Name: "vwr", Value: "same-viewer"})
+		rec := httptest.NewRecorder()
+		h.ServeHTTP(rec, req)
+		if rec.Code != 200 {
+			t.Fatalf("raw view: got %d", rec.Code)
+		}
+	}
+	req = httptest.NewRequest("GET", "/api/pastes/"+id, nil)
+	rec = httptest.NewRecorder()
+	h.ServeHTTP(rec, req)
+	if got := rec.Body.String(); !strings.Contains(got, `"view_count":3`) {
+		t.Fatalf("expected view_count 3 after 3 raw views by one viewer, got: %s", got)
+	}
+}
+
+// #95: after the dedupe window passes, the same viewer counts again.
+func TestViewDedupeWindowExpires(t *testing.T) {
+	s := testServer(t)
+	h := s.routes()
+
+	req := httptest.NewRequest("POST", "/api/pastes", strings.NewReader(`{"content":"we"}`))
+	rec := httptest.NewRecorder()
+	h.ServeHTTP(rec, req)
+	id := jsonField(t, rec.Body.String(), "id")
+
+	view := func() {
+		req := httptest.NewRequest("GET", "/"+id, nil)
+		req.AddCookie(&http.Cookie{Name: "vwr", Value: "v-w"})
+		rec := httptest.NewRecorder()
+		h.ServeHTTP(rec, req)
+		if rec.Code != 200 {
+			t.Fatalf("view: got %d", rec.Code)
+		}
+	}
+	view()
+	view()
+	// jump past the 15-minute window
+	realNow := store.TimeNow
+	store.TimeNow = func() time.Time { return realNow().Add(16 * time.Minute) }
+	defer func() { store.TimeNow = realNow }()
+	view()
+	req = httptest.NewRequest("GET", "/api/pastes/"+id, nil)
+	rec = httptest.NewRecorder()
+	h.ServeHTTP(rec, req)
+	if got := rec.Body.String(); !strings.Contains(got, `"view_count":2`) {
+		t.Fatalf("expected view_count 2 after window expiry, got: %s", got)
+	}
+}

internal/store/store.go

@@ -30,6 +30,8 @@ type Paste struct {
 	BurnAfterRead bool  `json:"burn_after_read,omitempty"`
 	BurnAfterReads *int `json:"burn_after_reads,omitempty"` // #49: readable N times (default 1)
 	Visibility  string  `json:"visibility"`
+	// #83: accept "public": true/false as an alias for visibility.
+	Public *bool `json:"public,omitempty"`
 	CanID       *string `json:"can_id,omitempty"`
 	CreatedAt   int64   `json:"created_at"`
 	DeletedAt   *int64  `json:"deleted_at,omitempty"`
@@ -60,6 +62,7 @@ type PasteRow struct {
 	Size          int
 	DeletionToken sql.NullString
 	ViewerID      sql.NullString
+	IsCan         bool // set on list rows that are cans (#4)
 }
 
 type CanRow struct {
@@ -70,6 +73,8 @@ type CanRow struct {
 	CreatedAt    int64
 	DeletedAt    sql.NullInt64
 	ExpiresAt    sql.NullInt64
+	Description  sql.NullString
+	ViewerID     sql.NullString
 }
 
 type Store struct {
@@ -130,6 +135,7 @@ deletion_token TEXT
 	s.db.Exec(`ALTER TABLE pastes ADD COLUMN viewer_id TEXT`)     // ignore if exists (#37)
 	s.db.Exec(`ALTER TABLE pastes ADD COLUMN reads_limit INTEGER`)          // ignore if exists (#49)
 	s.db.Exec(`ALTER TABLE pastes ADD COLUMN reads_used INTEGER DEFAULT 0`) // ignore if exists (#49)
+	s.db.Exec(`ALTER TABLE paste_cans ADD COLUMN viewer_id TEXT`) // ignore if exists (#4)
 	s.db.Exec(`CREATE TABLE IF NOT EXISTS paste_views (
 		paste_id    TEXT NOT NULL,
 		viewer_id   TEXT NOT NULL,
@@ -215,6 +221,14 @@ func (s *Store) CreatePaste(p *Paste) (*Paste, error) {
 	}
 
 	visibility := p.Visibility
+	// #83: "public": false -> unlisted, true -> public; overrides string field
+	if p.Public != nil {
+		if *p.Public {
+			visibility = "public"
+		} else {
+			visibility = "unlisted"
+		}
+	}
 	if visibility == "" {
 		visibility = "public"
 	}
@@ -262,9 +276,14 @@ func (s *Store) GetPaste(idOrSlug string) (*PasteRow, error) {
 // listed, and password-protected pastes are excluded at the query level
 // (#65) so their metadata (title, slug, existence) never leaks.
 func (s *Store) ListPublic(limit, offset int) ([]PasteRow, int, error) {
-	rows, err := s.db.Query(`SELECT id, custom_slug, content_type, language, title, visibility, created_at, view_count, LENGTH(content) FROM pastes
+	rows, err := s.db.Query(`SELECT id, custom_slug, content_type, language, title, visibility, created_at, view_count, LENGTH(content), 0
+		FROM pastes
 		WHERE visibility='public' AND deleted_at IS NULL AND can_id IS NULL AND password_hash IS NULL AND (expires_at IS NULL OR expires_at > ?)
-		ORDER BY created_at DESC LIMIT ? OFFSET ?`, time.Now().Unix(), limit, offset)
+		UNION ALL
+		SELECT id, NULL, 'text/plain', NULL, title, visibility, created_at, 0, 0, 1
+		FROM paste_cans
+		WHERE visibility='public' AND deleted_at IS NULL AND (expires_at IS NULL OR expires_at > ?)
+		ORDER BY created_at DESC LIMIT ? OFFSET ?`, time.Now().Unix(), time.Now().Unix(), limit, offset)
 	if err != nil {
 		return nil, 0, err
 	}
@@ -273,25 +292,33 @@ func (s *Store) ListPublic(limit, offset int) ([]PasteRow, int, error) {
 	for rows.Next() {
 		var r PasteRow
 		var cs, lang, title sql.NullString
-		if err := rows.Scan(&r.ID, &cs, &r.ContentType, &lang, &title, &r.Visibility, &r.CreatedAt, &r.ViewCount, &r.Size); err != nil {
+		var isCan int
+		if err := rows.Scan(&r.ID, &cs, &r.ContentType, &lang, &title, &r.Visibility, &r.CreatedAt, &r.ViewCount, &r.Size, &isCan); err != nil {
 			return nil, 0, err
 		}
 		r.CustomSlug = cs
 		r.Language = lang
 		r.Title = title
+		r.IsCan = isCan == 1
 		out = append(out, r)
 	}
 	var total int
-	s.db.QueryRow(`SELECT COUNT(*) FROM pastes WHERE visibility='public' AND deleted_at IS NULL AND can_id IS NULL AND password_hash IS NULL AND (expires_at IS NULL OR expires_at > ?)`, time.Now().Unix()).Scan(&total)
+	s.db.QueryRow(`SELECT (SELECT COUNT(*) FROM pastes WHERE visibility='public' AND deleted_at IS NULL AND can_id IS NULL AND password_hash IS NULL AND (expires_at IS NULL OR expires_at > ?))
+		+ (SELECT COUNT(*) FROM paste_cans WHERE visibility='public' AND deleted_at IS NULL AND (expires_at IS NULL OR expires_at > ?))`,
+		time.Now().Unix(), time.Now().Unix()).Scan(&total)
 	return out, total, nil
 }
 
 // ListMine lists pastes created from the given viewer id (browser cookie), newest first.
 func (s *Store) ListMine(viewerID string, limit, offset int) ([]PasteRow, int, error) {
-	rows, err := s.db.Query(`SELECT id, custom_slug, language, title, visibility, created_at, view_count, LENGTH(content)
+	rows, err := s.db.Query(`SELECT id, custom_slug, language, title, visibility, created_at, view_count, LENGTH(content), 0
 		FROM pastes
 		WHERE viewer_id = ? AND deleted_at IS NULL AND can_id IS NULL AND (expires_at IS NULL OR expires_at > ?)
-		ORDER BY created_at DESC LIMIT ? OFFSET ?`, viewerID, time.Now().Unix(), limit, offset)
+		UNION ALL
+		SELECT id, NULL, NULL, title, visibility, created_at, 0, 0, 1
+		FROM paste_cans
+		WHERE viewer_id = ? AND deleted_at IS NULL AND (expires_at IS NULL OR expires_at > ?)
+		ORDER BY created_at DESC LIMIT ? OFFSET ?`, viewerID, time.Now().Unix(), viewerID, time.Now().Unix(), limit, offset)
 	if err != nil {
 		return nil, 0, err
 	}
@@ -300,16 +327,18 @@ func (s *Store) ListMine(viewerID string, limit, offset int) ([]PasteRow, int, e
 	for rows.Next() {
 		var r PasteRow
 		var cs, lang, title sql.NullString
-		if err := rows.Scan(&r.ID, &cs, &lang, &title, &r.Visibility, &r.CreatedAt, &r.ViewCount, &r.Size); err != nil {
+		var isCan int
+		if err := rows.Scan(&r.ID, &cs, &lang, &title, &r.Visibility, &r.CreatedAt, &r.ViewCount, &r.Size, &isCan); err != nil {
 			return nil, 0, err
 		}
 		r.CustomSlug, r.Language, r.Title = cs, lang, title
+		r.IsCan = isCan == 1
 		out = append(out, r)
 	}
 	var total int
-	s.db.QueryRow(`SELECT COUNT(*) FROM pastes
+	s.db.QueryRow(`SELECT (SELECT COUNT(*) FROM pastes WHERE viewer_id = ? AND deleted_at IS NULL AND can_id IS NULL AND (expires_at IS NULL OR expires_at > ?))
-		WHERE viewer_id = ? AND deleted_at IS NULL AND can_id IS NULL AND (expires_at IS NULL OR expires_at > ?)`,
+		+ (SELECT COUNT(*) FROM paste_cans WHERE viewer_id = ? AND deleted_at IS NULL AND (expires_at IS NULL OR expires_at > ?))`,
-		viewerID, time.Now().Unix()).Scan(&total)
+		viewerID, time.Now().Unix(), viewerID, time.Now().Unix()).Scan(&total)
 	return out, total, nil
 }
 
@@ -342,14 +371,38 @@ func (s *Store) SoftDelete(id string) (bool, error) {
 	return n > 0, err
 }
 
-func (s *Store) IncrementViews(id string) {
+// IncrementViews counts one view. With a viewerID (#95): views are deduped
+// per-viewer within burnViewerWindow minutes using the paste_views table,
+// namespaced with a "views/" viewer prefix so these rows never collide with
+// RegisterRead's burn-after-read dedupe rows (which key on the raw viewer id).
+// Raw views always count (#49 decision) — call with viewerID="" for those.
+// Returns true when the view was counted.
+func (s *Store) IncrementViews(id, viewerID string, burnWindowMinutes int) bool {
+	if viewerID == "" {
 		s.db.Exec(`UPDATE pastes SET view_count = view_count + 1 WHERE id = ?`, id)
+		return true
+	}
+	now := TimeNow().Unix()
+	vkey := "views/" + viewerID
+	var last sql.NullInt64
+	s.db.QueryRow(`SELECT last_viewed FROM paste_views WHERE paste_id=? AND viewer_id=?`,
+		id, vkey).Scan(&last)
+	if last.Valid && now-last.Int64 < int64(burnWindowMinutes)*60 {
+		return false
+	}
+	s.db.Exec(`INSERT INTO paste_views (paste_id, viewer_id, last_viewed) VALUES (?,?,?)
+		ON CONFLICT(paste_id, viewer_id) DO UPDATE SET last_viewed = excluded.last_viewed`,
+		id, vkey, now)
+	s.db.Exec(`UPDATE pastes SET view_count = view_count + 1 WHERE id = ?`, id)
+	return true
 }
 
 // SweepExpired soft-deletes expired pastes and hard-deletes soft-deleted pastes past grace.
 func (s *Store) SweepExpired() {
 	now := time.Now().Unix()
 	s.db.Exec(`UPDATE pastes SET deleted_at=? WHERE expires_at IS NOT NULL AND expires_at < ? AND deleted_at IS NULL`, now, now)
+	// #4: cans expire too — mirror paste behavior
+	s.db.Exec(`UPDATE paste_cans SET deleted_at=? WHERE expires_at IS NOT NULL AND expires_at < ? AND deleted_at IS NULL`, now, now)
 	grace := now - SoftDeleteGraceDays*86400
 	s.db.Exec(`DELETE FROM pastes WHERE deleted_at IS NOT NULL AND deleted_at < ?`, grace)
 }
@@ -406,13 +459,46 @@ func (s *Store) HardDelete(id string) {
 	s.db.Exec(`DELETE FROM pastes WHERE id = ?`, id)
 }
 
-// InsertCan creates a paste_can row.
+// CreateCan inserts a paste_can row with optional custom slug (parity with
-func (s *Store) InsertCan(canID, title, description, visibility string, pwHash *string, createdAt int64, expiresAt *int64) error {
+// pastes: validated by the same rules, checked against both tables).
+// Returns ErrSlugTaken / ErrInvalidSlug / ErrReservedSlug on conflict.
+func (s *Store) CreateCan(canID, title, description, visibility string, pwHash *string, createdAt int64, expiresAt *int64, customSlug *string) error {
+	if customSlug != nil && *customSlug != "" {
+		slug := *customSlug
+		if err := ValidateCustomSlug(slug); err != nil {
+			return err
+		}
+		taken, err := s.SlugTaken(slug)
+		if err != nil {
+			return err
+		}
+		if taken {
+			return ErrSlugTaken
+		}
+		canID = slug
+	}
+	if visibility == "" {
+		visibility = "public"
+	}
+	if visibility != "public" && visibility != "unlisted" {
+		return errors.New("visibility must be public or unlisted")
+	}
 	_, err := s.db.Exec(`INSERT INTO paste_cans (id, title, description, visibility, password_hash, created_at, expires_at)
 		VALUES (?,?,?,?,?,?,?)`, canID, title, description, visibility, pwHash, createdAt, expiresAt)
 	return err
 }
 
+// SoftDeleteCan marks a can deleted (its items stay; they are unlisted and
+// hidden from listings by can_id and disappear with the can's page).
+func (s *Store) SoftDeleteCan(canID string) (bool, error) {
+	res, err := s.db.Exec(`UPDATE paste_cans SET deleted_at=? WHERE id=? AND deleted_at IS NULL`, time.Now().Unix(), canID)
+	if err != nil {
+		return false, err
+	}
+	n, err := res.RowsAffected()
+	return n > 0, err
+}
+
 // DeleteCan removes an (empty/aborted) can row.
 func (s *Store) DeleteCan(canID string) {
 	s.db.Exec(`DELETE FROM paste_cans WHERE id=?`, canID)
@@ -431,10 +517,10 @@ func (s *Store) InsertCanItem(canID, title, content, contentType string, languag
 }
 
 func (s *Store) GetCan(id string) (*CanRow, error) {
-	row := s.db.QueryRow(`SELECT id, title, visibility, password_hash, created_at, deleted_at, expires_at
+	row := s.db.QueryRow(`SELECT id, title, visibility, password_hash, created_at, deleted_at, expires_at, description, viewer_id
-		FROM paste_cans WHERE id = ? AND deleted_at IS NULL`, id)
+		FROM paste_cans WHERE (id = ?) AND deleted_at IS NULL`, id)
 	var c CanRow
-	err := row.Scan(&c.ID, &c.Title, &c.Visibility, &c.PasswordHash, &c.CreatedAt, &c.DeletedAt, &c.ExpiresAt)
+	err := row.Scan(&c.ID, &c.Title, &c.Visibility, &c.PasswordHash, &c.CreatedAt, &c.DeletedAt, &c.ExpiresAt, &c.Description, &c.ViewerID)
 	if err == sql.ErrNoRows {
 		return nil, nil
 	}

internal/web/securityheaders_test.go

@@ -3,7 +3,6 @@ package web
 import (
 	"net/http"
 	"net/http/httptest"
-	"strings"
 	"testing"
 )
 
@@ -28,29 +27,20 @@ func TestSecurityHeaders(t *testing.T) {
 		t.Errorf("X-Content-Type-Options = %q, want nosniff", got)
 	}
 
-	// JSON response: no security headers.
+	// JSON/raw responses: headers are now set unconditionally BEFORE the handler
+	// runs. The previous post-handler approach was silently dropped once a page
+	// handler flushed its template output (headers must be set before WriteHeader).
+	// CSP/nosniff/referrer on non-HTML bodies is harmless and desirable.
 	jsonh := SecurityHeaders(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		w.Header().Set("Content-Type", "application/json")
 		w.Write([]byte(`{"ok":true}`))
 	}))
 	rec = httptest.NewRecorder()
 	jsonh.ServeHTTP(rec, httptest.NewRequest("GET", "/api/x", nil))
-	if got := rec.Header().Get("Content-Security-Policy"); got != "" {
+	if got := rec.Header().Get("Content-Security-Policy"); got != wantCSP {
-		t.Errorf("unexpected CSP %q on JSON response", got)
+		t.Errorf("CSP missing on JSON response: got %q", got)
 	}
-	if got := rec.Header().Get("Referrer-Policy"); got != "" {
+	if got := rec.Header().Get("Referrer-Policy"); got != "no-referrer" {
-		t.Errorf("unexpected Referrer-Policy %q on JSON response", got)
+		t.Errorf("Referrer-Policy missing on JSON response: got %q", got)
-	}
-
-	// Content type set after the first Write (as the inline can page does) is
-	// still picked up because headers are inspected post-handler.
-	lateh := SecurityHeaders(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		w.Write([]byte("<html></html>"))
-		w.Header().Set("Content-Type", "text/html; charset=utf-8")
-	}))
-	rec = httptest.NewRecorder()
-	lateh.ServeHTTP(rec, httptest.NewRequest("GET", "/", nil))
-	if got := rec.Header().Get("Content-Security-Policy"); !strings.Contains(got, "frame-ancestors 'none'") {
-		t.Errorf("CSP = %q, want frame-ancestors 'none'", got)
 	}
 }

internal/web/static/app.css

@@ -143,7 +143,7 @@ body {
 /* paste view */
 .meta-bar { display: flex; align-items: center; gap: 12px; padding: 12px 18px; flex-wrap: wrap; }
 .meta-bar h1 { font-size: 29.2px; font-weight: 600; }
-.slug { font-family: var(--font-mono); font-size: 21.6px; color: var(--muted-fg); background: var(--surface-2); padding: 3px 9px; border-radius: var(--radius); }
+.slug { font-family: var(--font-mono); font-size: 21.6px; color: var(--muted-fg); background: var(--surface-2); padding: 3px 9px; border-radius: var(--radius-sm); }
 .tag { font-size: 19.8px; color: var(--muted-fg); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 2px 9px; }
 .paste-title-bar { display: flex; align-items: center; gap: 12px; padding: 12px 18px; flex-wrap: wrap; }
 .paste-title-bar h1 { font-size: 29.2px; font-weight: 600; margin: 0; }
@@ -165,6 +165,20 @@ body {
 .settings-head { padding: 12px 18px; border-bottom: 1px solid var(--border); }
 .settings-head h1 { font-size: 29.2px; font-weight: 600; margin: 0; }
 .settings-body { padding: 16px 18px; color: var(--muted-fg); font-size: 21.6px; }
+.settings-section-title { color: var(--fg); font-size: 24px; margin-bottom: 6px; }
+/* theme switcher cards (#100) */
+.theme-grid { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 14px; }
+.theme-card {
+  display: flex; flex-direction: column; gap: 10px; align-items: flex-start;
+  padding: 14px 16px; min-width: 180px;
+  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
+  color: var(--fg); font: inherit; font-size: 20px; cursor: pointer;
+}
+.theme-card:hover { border-color: var(--muted); }
+.theme-card[aria-pressed="true"] { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent); }
+.theme-card .swatches { display: flex; gap: 4px; }
+.theme-card .swatch { width: 26px; height: 26px; border-radius: 6px; border: 1px solid rgba(255,255,255,.15); }
+.theme-name { font-weight: 600; }
 .iconbtn:hover { color: var(--fg); border-color: var(--muted); }
 .iconbtn.danger:hover { color: #ff8fa3; border-color: #ff8fa3; }
 .code-head {
@@ -201,7 +215,8 @@ th {
   text-align: left; font-size: 18.9px; text-transform: uppercase; letter-spacing: .08em;
   color: var(--muted-fg); padding: 10px 16px; border-bottom: 1px solid var(--border); font-weight: 600;
 }
-td { padding: 10px 16px; border-bottom: 1px solid var(--border); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
+td { padding: 10px 16px; border-bottom: 1px solid var(--border); overflow: clip; text-overflow: ellipsis; white-space: nowrap; }
+td:has(> a.slug), td:has(> .slug) { overflow: visible; }
 tr:last-child td { border-bottom: none; }
 tr.row { cursor: pointer; }
 tr.row:hover td { background: var(--surface-2); }
@@ -333,14 +348,15 @@ td a.slug:hover { color: var(--accent); }
 /* paste name under slug pill in Paste column (#43) */
 .paste-sub { font-size: 19.8px; color: var(--muted-fg); margin-top: 2px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
 .paste-sub.dim { color: var(--muted); }
-td .url-link { font-size: 19.8px; }
+td a.slug.url-link { max-width: 100%; display: inline-block; vertical-align: middle; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; box-sizing: border-box; }
 td .id-link { color: var(--muted-fg); text-decoration: none; font-family: var(--font-mono); font-size: 19.8px; }
 td .id-link:hover { color: var(--accent); }
 
 /* sortable column headers (#42) */
 th.sortable { cursor: pointer; user-select: none; }
 th.sortable:hover { color: var(--fg); }
-.sort-ind { display: inline-block; width: 0; height: 0; margin-left: 6px; vertical-align: middle; border-left: 5px solid transparent; border-right: 5px solid transparent; }
+th.sortable { cursor: pointer; user-select: none; white-space: nowrap; }
+.sort-ind { display: inline-block; width: 0; height: 0; margin-left: 8px; vertical-align: middle; border-left: 5px solid transparent; border-right: 5px solid transparent; }
 th.sorted.asc .sort-ind { border-bottom: 6px solid var(--accent); }
 th.sorted.desc .sort-ind { border-top: 6px solid var(--accent); }
 
@@ -456,3 +472,16 @@ th.sorted.desc .sort-ind { border-top: 6px solid var(--accent); }
   .unlock-err { font-size: 13px; }
   .center .foot { font-size: 13px; }
 }
+
+/* #4: can view page + can builder */
+.can-page h1 { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
+.can-items { display: flex; flex-direction: column; gap: 12px; margin-top: 14px; }
+.can-item { padding: 12px 14px; }
+.can-item-head { display: flex; align-items: center; gap: 10px; }
+.can-item-head strong { flex: 1; word-break: break-all; }
+.can-item-body { margin-top: 8px; }
+.can-item-body summary { cursor: pointer; font-size: 19px; color: var(--muted, #888); }
+.can-item-body pre.code { margin: 8px 0 0; overflow-x: auto; }
+.can-item-row { margin-top: 8px; }
+.can-item-row .can-item-title { width: 100%; margin-bottom: 6px; }
+.can-item-row .can-item-content { width: 100%; font-family: var(--mono, monospace); resize: vertical; }

internal/web/templates/can.html

@@ -0,0 +1,36 @@
+{{template "head" .}}
+{{template "topbar" .}}
+<div class="center">
+  <div class="float can-page" style="max-width:900px; width:100%;">
+    <div class="inner">
+      <h1>{{.Title}} <span class="badge" title="This is a can — a bundle of pastes">can</span></h1>
+      {{if .HasDescription}}<p class="sub">{{.Description}}</p>{{end}}
+      <p class="hint">{{.ItemCount}} item{{if ne .ItemCount 1}}s{{end}} · {{.SizeHuman}} · created <span data-ts="{{.CreatedAtUnix}}">{{.CreatedAgo}}</span>{{if .ExpiresAt}} · expires in {{.ExpiresIn}}{{end}}{{if .HasPassword}} · password protected{{end}}</p>
+
+      <div class="can-items">
+        {{range .Items}}
+        <div class="can-item float">
+          <div class="can-item-head">
+            <strong>{{.Title}}</strong>
+            <span class="dim">{{.Size}}</span>
+            {{if .IsFile}}
+              <a class="btn btn-icon" href="/api/cans/{{$.ID}}/items/{{.ID}}" download="{{.Title}}" title="Download file" aria-label="Download {{.Title}}">↓</a>
+            {{else}}
+              <a class="btn btn-icon" href="/api/cans/{{$.ID}}/items/{{.ID}}" title="Raw item" aria-label="Raw {{.Title}}">⧉</a>
+            {{end}}
+          </div>
+          {{if not .IsFile}}
+          <details class="can-item-body">
+            <summary>Show content</summary>
+            <pre class="code"><code>{{.ContentHTML}}</code></pre>
+          </details>
+          {{else}}
+          <div class="hint">Attached file — use the download button above.</div>
+          {{end}}
+        </div>
+        {{end}}
+      </div>
+    </div>
+  </div>
+</div>
+{{template "foot" .}}

internal/web/templates/history.html

@@ -10,13 +10,13 @@
     <table>
       <colgroup><col style="width:260px"><col style="width:140px"><col style="width:120px"><col style="width:96px"><col style="width:140px"><col style="width:190px"><col style="width:100px"></colgroup>
       <thead><tr>
-        <th data-sort="title" class="sortable"><span class="sort-ind"></span>Paste</th>
+        <th data-sort="title" class="sortable">Paste<span class="sort-ind"></span></th>
-        <th data-sort="language" class="sortable"><span class="sort-ind"></span>Language</th>
+        <th data-sort="language" class="sortable">Language<span class="sort-ind"></span></th>
-        <th data-sort="size" class="sortable"><span class="sort-ind"></span>Size</th>
+        <th data-sort="size" class="sortable">Size<span class="sort-ind"></span></th>
-        <th data-sort="view_count" class="sortable"><span class="sort-ind"></span>Views</th>
+        <th data-sort="view_count" class="sortable">Views<span class="sort-ind"></span></th>
-        <th data-sort="created_at" class="sortable"><span class="sort-ind"></span>Created</th>
+        <th data-sort="created_at" class="sortable">Created<span class="sort-ind"></span></th>
-        <th data-sort="custom_slug" class="sortable"><span class="sort-ind"></span>URL</th>
+        <th data-sort="custom_slug" class="sortable">URL<span class="sort-ind"></span></th>
-        <th data-sort="id" class="sortable"><span class="sort-ind"></span>ID</th>
+        <th data-sort="id" class="sortable">ID<span class="sort-ind"></span></th>
       </tr></thead>
       <tbody id="rows"></tbody>
     </table>
@@ -36,8 +36,8 @@ const t = PaletteTable.init({
   rowHtml: it =>
     `<tr class="row" data-href="/${t.esc(it.id)}"><td>` +
     (it.title
-      ? `${t.esc(it.title)}`
+      ? `${t.esc(it.title)}${it.is_can ? ' <span class="badge" title="Can — bundle of items">can</span>' : ''}`
-      : `<a class="slug" href="/${t.esc(it.id)}">${t.esc(it.id)}</a>`) +
+      : `<a class="slug" href="/${t.esc(it.id)}">${t.esc(it.id)}</a>${it.is_can ? ' <span class="badge" title="Can — bundle of items">can</span>' : ''}`) +
     `</td>` +
     `<td><span class="badge">${t.esc(it.language || 'text')}</span></td>` +
     `<td class="dim">${t.fmtSize(it.size)}</td><td class="dim">${it.view_count}</td><td class="dim" data-ts="${it.created_at}">${t.ago(it.created_at)}</td>` +

internal/web/templates/mine.html

@@ -10,17 +10,21 @@
     <table>
       <colgroup><col style="width:260px"><col style="width:140px"><col style="width:120px"><col style="width:150px"><col style="width:190px"><col style="width:100px"></colgroup>
       <thead><tr>
-        <th data-sort="title" class="sortable"><span class="sort-ind"></span>Paste</th>
+        <th data-sort="title" class="sortable">Paste<span class="sort-ind"></span></th>
-        <th data-sort="language" class="sortable"><span class="sort-ind"></span>Language</th>
+        <th data-sort="language" class="sortable">Language<span class="sort-ind"></span></th>
-        <th data-sort="size" class="sortable"><span class="sort-ind"></span>Size</th>
+        <th data-sort="size" class="sortable">Size<span class="sort-ind"></span></th>
-        <th data-sort="created_at" class="sortable"><span class="sort-ind"></span>Created</th>
+        <th data-sort="created_at" class="sortable">Created<span class="sort-ind"></span></th>
-        <th data-sort="custom_slug" class="sortable"><span class="sort-ind"></span>URL</th>
+        <th data-sort="custom_slug" class="sortable">URL<span class="sort-ind"></span></th>
-        <th data-sort="id" class="sortable"><span class="sort-ind"></span>ID</th>
+        <th data-sort="id" class="sortable">ID<span class="sort-ind"></span></th>
       </tr></thead>
       <tbody id="rows"></tbody>
     </table>
     <div class="empty" id="empty" style="display:none">No pastes from this browser yet.</div>
   </div>
+  <div class="pager float">
+    <span id="showing"></span>
+    <div class="pg" id="pg"></div>
+  </div>
 </div>
 <script src="/static/table.js"></script>
 <script>
@@ -38,13 +42,13 @@ function toast(msg, kind) {
 
 const t = PaletteTable.init({
   endpoint: '/api/mine',
-  perPage: 50,
+  perPage: 25,
-  hasPager: false,
+  hasPager: true,
   rowHtml: it =>
     `<tr class="row" data-href="/${t.esc(it.id)}"><td>` +
     (it.title
-      ? `${t.esc(it.title)}`
+      ? `${t.esc(it.title)}${it.is_can ? ' <span class="badge" title="Can — bundle of items">can</span>' : ''}`
-      : `<a class="slug" href="/${t.esc(it.id)}">${t.esc(it.id)}</a>`) +
+      : `<a class="slug" href="/${t.esc(it.id)}">${t.esc(it.id)}</a>${it.is_can ? ' <span class="badge" title="Can — bundle of items">can</span>' : ''}`) +
     `</td>` +
     `<td><span class="badge">${t.esc(it.language || 'text')}</span></td>` +
     `<td class="dim">${t.fmtSize(it.size)}</td><td class="dim" data-ts="${it.created_at}">${t.ago(it.created_at)}</td>` +

internal/web/templates/new.html

@@ -68,6 +68,15 @@
       <input type="text" id="custom" class="custom-input" placeholder="/my-snippet">
       <div class="hint" style="margin-top:6px; font-size:19px;">Stays reserved while the paste exists</div>
     </div>
+    <div class="float side-section">
+      <h3>Can contents</h3>
+      <label class="toggle"><input type="checkbox" id="iscan"> Bundle as a can (multiple text items)</label>
+      <div class="pw-row" id="canrow" style="display:none">
+        <div id="can-items"></div>
+        <button class="btn btn-icon" id="can-add" type="button" title="Add item" style="margin-top:6px">+ Add item</button>
+        <div class="hint" style="margin-top:6px; font-size:19px;">Each item gets its own card on the can page. File uploads in cans come later.</div>
+      </div>
+    </div>
     <div class="float side-section" id="result-card" style="display:none">
       <h3>Result</h3>
       <div class="hint" id="result" style="word-break:break-all">empty</div>
@@ -145,6 +154,21 @@ $('pwreveal').addEventListener('click', () => {
   $('pwreveal').title = show ? 'Hide password' : 'Show password';
 });
 
+// #4: can builder — multiple text items bundled into one shareable page.
+// The main editor becomes the first item; extra items are added below.
+$('iscan').addEventListener('change', e => {
+  $('canrow').style.display = e.target.checked ? 'block' : 'none';
+  if (e.target.checked && !$('can-items').children.length) addCanItem();
+});
+function addCanItem() {
+  const row = document.createElement('div');
+  row.className = 'can-item-row';
+  row.innerHTML = '<input class="can-item-title" placeholder="Item title">' +
+    '<textarea class="can-item-content" placeholder="Item content" rows="3" spellcheck="false"></textarea>';
+  $('can-items').appendChild(row);
+}
+$('can-add').addEventListener('click', addCanItem);
+
 let guessed = ''; // last auto-detected language, '' = user override
 
 function showResult(html, isError) {
@@ -197,6 +221,9 @@ $('reguess').addEventListener('click', guessLang);
 content.addEventListener('paste', () => setTimeout(guessLang, 0));
 
 async function create() {
+  // #4: can mode — bundle the editor + extra items into a can via multipart
+  if ($('iscan').checked) return createCan();
+
   const body = {
     content: content.value,
     title: $('title').value || null,
@@ -252,6 +279,62 @@ async function create() {
   location.href = dest;
 }
 $('create').addEventListener('click', create);
+
+// #4: can creation — POST multipart to /api/pastes/can. The main editor is
+// the first item; each extra can-item row is another text item.
+async function createCan() {
+  const items = [];
+  if (content.value.trim()) {
+    items.push({title: $('title').value || 'main', content: content.value, language: $('language').value || ''});
+  }
+  document.querySelectorAll('#can-items .can-item-row').forEach(row => {
+    const t = row.querySelector('.can-item-title').value.trim();
+    const c = row.querySelector('.can-item-content').value;
+    if (c.trim()) items.push({title: t || ('item-' + (items.length + 1)), content: c});
+  });
+  if (!items.length) { toast('Nothing to put in the can', 'error'); return; }
+
+  const fd = new FormData();
+  fd.append('title', $('title').value || 'Untitled can');
+  fd.append('json_items', JSON.stringify(items));
+  if ($('haspw').checked) fd.append('password', $('password').value);
+  if ($('unlisted').checked) fd.append('visibility', 'unlisted');
+  const exp = document.querySelector('input[name="exp"]:checked').value;
+  if (exp === 'custom') {
+    const dur = composeCustomExpiry();
+    if (dur === null) { toast('Check the custom expiry', 'error'); return; }
+    if (dur) fd.append('expires_in', dur);
+  } else if (exp) {
+    fd.append('expires_in', exp);
+  }
+  if ($('custom').value.trim()) fd.append('custom_slug', $('custom').value.trim());
+
+  const res = await fetch('/api/pastes/can', {method: 'POST', body: fd});
+  const data = await res.json();
+  if (!res.ok) {
+    showResult('Error: ' + (data.error || res.status), true);
+    toast('Can create failed', 'error');
+    return;
+  }
+  const url = location.origin + data.url;
+  showResult('<a href="' + url + '">' + url + '</a> <button class="btn btn-icon" id="result-copy" title="Copy URL" type="button">⧉</button>', false);
+  const copyBtn = document.getElementById('result-copy');
+  copyBtn.addEventListener('click', () => {
+    try {
+      navigator.clipboard.writeText(url);
+      copyBtn.classList.add('ok');
+      copyBtn.textContent = 'Success!';
+      setTimeout(() => { copyBtn.classList.remove('ok'); copyBtn.textContent = '⧉'; }, 2000);
+    } catch(e) { toast('Copy failed', 'error'); }
+  });
+  // password-protected can: unlock now with the password we already have (#26 parity)
+  if ($('haspw').checked && data.id) {
+    const pd = new FormData();
+    pd.append('password', $('password').value);
+    try { await fetch('/can/' + data.id, {method: 'POST', body: pd}); } catch(e) {}
+  }
+  location.href = data.url;
+}
 // reset stale result state when returning via Back (bfcache) (#28)
 window.addEventListener('pageshow', e => {
   if (!e.persisted) return;

internal/web/version.go

@@ -0,0 +1,6 @@
+package web
+
+// Version is the display version, set at build time via
+// -ldflags "-X palette/internal/web.Version=v0.2.1" (#93). Falls back to
+// "dev" for bare `go build` runs.
+var Version = "dev"

internal/web/web.go

@@ -34,6 +34,7 @@ type UI struct {
 func New() (*UI, error) {
 	funcs := template.FuncMap{
 		"humanSize": humanSize,
+		"version":   func() string { return Version }, // #93: topbar version label
 	}
 	t, err := template.New("").Funcs(funcs).ParseFS(tmplFS, "templates/*.html")
 	if err != nil {
@@ -64,6 +65,29 @@ func (h *Handlers) renderPage(w http.ResponseWriter, name string, data any) {
 	}
 }
 
+// RenderPage is the exported wrapper used by the api package (#4 can pages).
+func (h *Handlers) RenderPage(w http.ResponseWriter, name string, data any) {
+	h.renderPage(w, name, data)
+}
+
+// WriteRateLimited is the exported rate-limit response used by the api package (#4).
+func (h *Handlers) WriteRateLimited(w http.ResponseWriter, retryAfterSecs int) {
+	h.writeRateLimited(w, retryAfterSecs)
+}
+
+// UnlockToken returns the per-id HMAC unlock token (cookie value, #34).
+// Exported for the api package so can pages share paste cookie semantics (#4).
+func UnlockToken(id string) string { return unlockToken(id) }
+
+// AgoString formats a relative "N ago" string (exported for the api package, #4).
+func AgoString(ts int64) string { return agoString(ts) }
+
+// HumanSize formats a byte count as a human string (exported for the api package, #4).
+func HumanSize(n int) string { return humanSize(n) }
+
+// ExpiryString formats remaining time until an epoch seconds expiry (#4).
+func ExpiryString(expiresAt int64) string { return expiryString(expiresAt) }
+
 // #34: per-paste unlock tokens. unlockSecret is generated once at startup
 // (also derivable from PALETTE_UNLOCK_SECRET for multi-instance deploys) and
 // used to HMAC paste ids, so a client can only hold a valid pw_<id> cookie by
@@ -245,12 +269,13 @@ func (h *Handlers) HandlePasteView(w http.ResponseWriter, r *http.Request) {
 		// one-time display of the deletion token via the created banner
 		http.SetCookie(w, &http.Cookie{Name: "tok_" + row.ID, Value: token, Path: "/", MaxAge: 60, HttpOnly: true, SameSite: http.SameSiteLaxMode})
 	}
-	// Count the view for every real page render. Raw views increment in
+	// Count the view for real page renders, deduped per-viewer within the
-	// handleRaw; the HTML path was missing its increment, so view_count only
+	// burn window (#95): a reload by the same vwr cookie doesn't inflate
-	// ever moved via /raw and the API-stored count stayed at 0 (#33).
+	// view_count. Raw views increment unconditionally in handleRaw (#49); the
-	// The just-created banner render does not count as a view.
+	// HTML path was missing its increment originally (#33). The just-created
+	// banner render does not count as a view.
 	if !justCreated {
-		h.Store.IncrementViews(row.ID)
+		h.Store.IncrementViews(row.ID, h.ViewerID(r), h.BurnWindowMin())
 	}
 	// #49: burn-after-N-reads budget (per-viewer dedupe window).
 	// Just-created first render does not count as a read for the creator.
@@ -279,7 +304,16 @@ func (h *Handlers) HandleHistoryPage(w http.ResponseWriter, r *http.Request) {
 
 // HandleSettingsPage serves /settings.
 func (h *Handlers) HandleSettingsPage(w http.ResponseWriter, r *http.Request) {
-	h.renderPage(w, "settings.html", map[string]any{"Page": "settings"})
+	// #100: theme presets. Midnight is the default (no data-preset attribute),
+	// so its swatches are hardcoded here; the CSS defines the token values.
+	themes := []map[string]any{
+		{"Name": "midnight", "Label": "Midnight", "Swatches": []string{"#241B30", "#2D2340", "#3A2D52", "#C4A8F0", "#F2EDF8"}},
+		{"Name": "smooth", "Label": "Smooth", "Swatches": []string{"#F6F5FA", "#FFFFFF", "#DAD7E6", "#7A7796", "#2A2A36"}},
+		{"Name": "pastel-lavender", "Label": "Pastel Lavender", "Swatches": []string{"#e6e0f5", "#f1edfa", "#cbb8e7", "#806bb8", "#3E3059"}},
+		{"Name": "pastel-peach", "Label": "Pastel Peach", "Swatches": []string{"#ffe0d6", "#fff0ea", "#ffc4a8", "#f9826c", "#4F2318"}},
+		{"Name": "pastel-cloud", "Label": "Pastel Cloud", "Swatches": []string{"#fff0f6", "#fff7fb", "#ffc8dd", "#a2d2ff", "#4A3355"}},
+	}
+	h.renderPage(w, "settings.html", map[string]any{"Page": "settings", "Themes": themes})
 }
 
 // HandleMinePage serves /mine.
@@ -304,13 +338,15 @@ func (u *UI) Handlers() *Handlers { return &Handlers{UI: u} }
 // pentest. Runs after the handler so the Content-Type is already set.
 func SecurityHeaders(next http.Handler) http.Handler {
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		next.ServeHTTP(w, r)
+		// Set before the handler runs: once a handler writes (template render
+		// flushes), header mutations are silently dropped. Setting the headers
+		// unconditionally is safe: CSP/nosniff/referrer on JSON or /raw bodies
+		// is harmless and arguably desirable.
 		h := w.Header()
-		if strings.HasPrefix(h.Get("Content-Type"), "text/html") {
 		h.Set("Content-Security-Policy",
 			"default-src 'self'; script-src 'self' 'unsafe-inline'; frame-ancestors 'none'")
 		h.Set("Referrer-Policy", "no-referrer")
 		h.Set("X-Content-Type-Options", "nosniff")
-		}
+		next.ServeHTTP(w, r)
 	})
 }