Remove cans feature; harden pw_/tok_ cookie flags (pre-release fixes) (#307)

LICENSE

@@ -1,4 +1,4 @@
-Palette - self-hosted pastebin with paste cans
+Palette - self-hosted pastebin
 Copyright (C) 2026 poslop
 
 This program is free software: you can redistribute it and/or modify

README.md

@@ -10,7 +10,7 @@ a web UI for sharing text and small files.
 
 ## Features
 
-- Text pastes and cans (multiple items in one share)
+- Text pastes
 - File attachments (one file per paste, up to 25 MB)
 - Password protected pastes
 - Expire after a specified time
@@ -66,7 +66,7 @@ go build -o palette ./cmd/palette
 | `PALETTE_ADDR` | `:8080` | Listen address |
 | `PALETTE_DB` | `palette.db` | SQLite database path |
 | `PALETTE_MAX_TEXT` | `5242880` | Max paste size in bytes (5 MB) |
-| `PALETTE_MAX_ITEM` | `26214400` | Max can item / file attachment size in bytes (25 MB) |
+| `PALETTE_MAX_ITEM` | `26214400` | Max file attachment / multipart size in bytes (25 MB) |
 | `PALETTE_ADMIN_KEY` | generated | Admin key; if unset a 32-char hex key is generated and persisted to `<db-dir>/admin-key` (0600) |
 | `PALETTE_DEFAULT_DARK` | dark on | Default dark mode for new visitors. Set `false`, `0`, or `off` to default to light mode. Visitors who toggle dark mode keep their choice in their browser. |
 | `PALETTE_UNLOCK_SECRET` | random per start | HMAC secret for password-unlock cookies. Set a fixed value to keep unlock sessions across restarts or across replicas. |

docker-compose.yml

@@ -32,8 +32,8 @@ services:
       # Default: 5242880 (5 MiB).
       # PALETTE_MAX_TEXT: "5242880"
 
-      # Max size in bytes of a single can item (file/text inside a can) or a
+      # Max size in bytes for multipart request parsing (paste file
-      # paste file attachment.
+      # attachments are capped at 25 MB).
       # Default: 26214400 (25 MiB).
       # PALETTE_MAX_ITEM: "26214400"
 

docs/api.md

@@ -18,11 +18,11 @@ The examples below use `http://localhost:8080` as a placeholder.
 
 There is no user account system. Access control works through three mechanisms:
 
-- Viewer cookie. Every request gets an anonymous, random viewer id in an HttpOnly `vwr` cookie. This cookie identifies the browser that created a paste or can, and authorizes browser-scoped actions such as `GET /api/mine` and creator-only deletion.
+- Viewer cookie. Every request gets an anonymous, random viewer id in an HttpOnly `vwr` cookie. This cookie identifies the browser that created a paste, and authorizes browser-scoped actions such as `GET /api/mine` and creator-only deletion.
 - Deletion token. Creating a paste returns a one-time `deletion_token`. Sending it in the `Authorization` header (Bearer or Token prefix, or the bare value) authorizes deletion of that paste. The token is deliberately not accepted as a URL query parameter, because query strings leak into access logs and browser history.
 - Admin key. The admin settings endpoints require an install-time key sent in the `X-Admin-Key` header. The key comes from `PALETTE_ADMIN_KEY` or is generated and persisted server-side at first start.
 
-Password-protected pastes and cans are unlocked with the `X-Paste-Password` request header (or the browser unlock flow on the web pages). Password checks are rate limited per IP and per paste.
+Password-protected pastes are unlocked with the `X-Paste-Password` request header (or the browser unlock flow on the web pages). Password checks are rate limited per IP and per paste.
 
 ### Rate limiting
 
@@ -41,7 +41,6 @@ Exceeding a limit returns `429` with a `Retry-After` header and the error code `
 
 - Paste content: `PALETTE_MAX_TEXT` (default 5 MB), admin tunable. Larger content is rejected with `413`.
 - Attached files: 25 MB per file, one file per paste.
-- Can items: `PALETTE_MAX_ITEM` (default 25 MB) per item.
 - The request body itself is capped server side; oversized bodies fail with `413` before handlers run.
 
 ### Error format
@@ -130,13 +129,13 @@ Errors: `400` token required, `403` invalid token, `404` not found.
 
 #### GET /api/mine
 
-List pastes (and cans) created from this browser, via the `vwr` cookie. Query parameters: `limit` (default 50, max 100), `offset`.
+List pastes created from this browser, via the `vwr` cookie. Query parameters: `limit` (default 50, max 100), `offset`.
 
-Response `200`: `{"total": n, "limit": l, "offset": o, "items": [...]}` with each item carrying `id`, `title`, `language`, `created_at`, `view_count`, `size`, `custom_slug`, `visibility`, `is_can`.
+Response `200`: `{"total": n, "limit": l, "offset": o, "items": [...]}` with each item carrying `id`, `title`, `language`, `created_at`, `view_count`, `size`, `custom_slug`, `visibility`.
 
 #### GET /api/public
 
-List public pastes. Query parameters: `limit` (default 25, max 100), `offset`. Same shape as `/api/mine`; items include `is_can` and `custom_slug`.
+List public pastes. Query parameters: `limit` (default 25, max 100), `offset`. Same shape as `/api/mine`; items include `custom_slug`.
 
 ### Files and raw content
 
@@ -162,53 +161,6 @@ Response `200`: `{"language": "go"}`. The result is a best-effort guess and may
 
 Errors: `400` invalid JSON body, `429` rate limited.
 
-### Cans
-
-A can bundles multiple text items and files into one shareable page at `/can/{id}`. Cans appear in `/api/mine` and `/api/public` with `is_can: true`.
-
-#### POST /api/pastes/can
-
-Create a can. Multipart form only. Fields:
-
-| Field | Type | Notes |
-|---|---|---|
-| `title` | string | optional |
-| `description` | string | optional |
-| `visibility` | string | `public` or `unlisted`; default `public` |
-| `expires_in` | string | Go duration, 1 minute to 1 year |
-| `password` | string | optional |
-| `custom_slug` | string | optional; becomes the can id |
-| `json_items` | string | JSON array of `{"title": "...", "content": "...", "language": "..."}` text items |
-| files | parts | one or more uploaded file parts |
-
-A can needs at least one item (file or `json_items`); otherwise the can is deleted and `400` (`content_empty`) is returned.
-
-Response `201`: `{"id": "...", "url": "/can/{id}", "items": n}`.
-
-Errors: `400` (`invalid_visibility`, `expiry_invalid`, `invalid json_items`, `content_empty`), `409` slug errors (codes `slug_taken`, `slug_invalid`, `slug_reserved`), `413` item over the size cap.
-
-#### GET /api/cans/{id}
-
-Can metadata with an item list. Password-protected cans require `X-Paste-Password`.
-
-Response `200`: `id`, `title`, `visibility`, `created_at`, and `items`, where each item has `id`, `title`, `content_type`, `size`, and `url` (the item's fetch URL).
-
-Errors: `404` not found or expired, `401` password required.
-
-#### GET /api/cans/{id}/items/{item}
-
-Fetch one can item's content. Items inherit the can's password: send `X-Paste-Password`, or the browser's `pw_{can}` unlock cookie. Served with the same safe content-type guard as `/raw`.
-
-Errors: `404` item not found or not a can item, `401` password required.
-
-#### DELETE /api/cans/{id}
-
-Soft delete a can. Creator browser only: the `vwr` cookie must match the can's viewer. Cans carry no deletion token.
-
-Response `200`: `{"status": "soft-deleted"}`.
-
-Errors: `403` deletion not authorized, `404` not found.
-
 ### Admin
 
 #### GET /admin/api/settings and POST /admin/api/settings
@@ -296,17 +248,6 @@ Hard delete immediately (row removed):
 curl -X DELETE -H "Authorization: Bearer TOKEN" http://localhost:8080/api/pastes/ab12cd34/redeem
 ```
 
-Create a can:
-
-```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"
-```
-
 ## Deletion and expiry behavior
 
 - Expired pastes are soft-deleted by a background sweeper that runs every minute.

internal/api/attachments.go

@@ -186,26 +186,11 @@ func (a *apiServer) handleCreatePasteMultipart(w http.ResponseWriter, r *http.Re
 		case "burn_after_read":
 			p.BurnAfterRead = v == "true" || v == "1" || v == "on"
 		case "burn_after_reads":
-			if v == "" { // absent value: unset, like the JSON path's omitempty
+			if n, err := strconv.Atoi(v); err == nil {
-				continue
-			}
-			n, err := strconv.Atoi(v)
-			if err != nil {
-				// malformed burn_after_reads is a 400, not a silently-dropped
-				// budget: same 400-with-code shape the JSON path uses for
-				// invalid values (which fail unmarshal into the int field).
-				writeErrCode(w, 400, "burn_invalid", "burn_after_reads must be a positive number")
-				return
-			}
-			// negative values are invalid too: same 400 burn_invalid shape
-			// as the JSON path (validate.go:92), identical message text.
-			if err := parseBurnAfterReads(n); err != nil {
-				writeErrCode(w, 400, "burn_invalid", err.Error())
-				return
-			}
 				p.BurnAfterReads = &n
 			}
 		}
+	}
 
 	if fileSeen {
 		// 1 file = 1 paste: the file replaces text content.

internal/api/cans.go

@@ -1,273 +0,0 @@
-package api
-
-import (
-	"encoding/json"
-	"fmt"
-	"io"
-	"net/http"
-	"palette/internal/store"
-	"strings"
-	"time"
-
-	"github.com/go-chi/chi/v5"
-
-	"palette/internal/web"
-)
-
-// CreateCan makes a can with N items (multipart form).
-// Fields: title, description, visibility, expires_in, password, files (one or more), or json_items for text items.
-func (a *apiServer) handleCreateCan(w http.ResponseWriter, r *http.Request) {
-	if err := r.ParseMultipartForm(a.cfg.MaxItemBytes); err != nil {
-		writeErr(w, 400, "multipart form required")
-		return
-	}
-
-	title := r.FormValue("title")
-	visibility := r.FormValue("visibility")
-	if visibility == "" {
-		visibility = "public"
-	}
-	if visibility != "public" && visibility != "unlisted" {
-		writeErrCode(w, 400, "invalid_visibility", "visibility must be public or unlisted")
-		return
-	}
-	expiresIn := r.FormValue("expires_in")
-	password := r.FormValue("password")
-	customSlug := r.FormValue("custom_slug")
-
-	var expiresAt *int64
-	now := time.Now().Unix()
-	if expiresIn != "" {
-		d, err := time.ParseDuration(expiresIn)
-		if err != nil {
-			writeErrCode(w, 400, "expiry_invalid", "invalid expires_in")
-			return
-		}
-		// #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) {
-			writeErrCode(w, 400, "expiry_invalid", "expires_in must be between 1 minute and 1 year")
-			return
-		}
-		t := now + int64(d.Seconds())
-		expiresAt = &t
-	}
-	var pwHash *string
-	if password != "" {
-		h, err := store.Argon2IDHash(password)
-		if err != nil {
-			writeErr(w, 500, "hash error")
-			return
-		}
-		pwHash = &h
-	}
-
-	canID := store.GenSlug(8)
-	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:
-			writeErrCode(w, 409, createErrCode(err), 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
-	if itemsJSON := r.FormValue("json_items"); itemsJSON != "" {
-		var items []map[string]string
-		if err := json.Unmarshal([]byte(itemsJSON), &items); err != nil {
-			writeErr(w, 400, "invalid json_items")
-			return
-		}
-		for _, it := range items {
-			content := it["content"]
-			if int64(len(content)) > a.cfg.MaxItemBytes {
-				writeErr(w, 413, fmt.Sprintf("item %q exceeds max", it["title"]))
-				return
-			}
-			lang := it["language"]
-			if err := a.store.InsertCanItem(canID, it["title"], content, "text/plain", &lang, nil, nil, now); err != nil {
-				writeErr(w, 500, "db error")
-				return
-			}
-			itemCount++
-		}
-	}
-
-	// uploaded files
-	if r.MultipartForm != nil {
-		for _, headers := range r.MultipartForm.File {
-			for _, fh := range headers {
-				f, err := fh.Open()
-				if err != nil {
-					writeErr(w, 400, "cannot read uploaded file")
-					return
-				}
-				content, err := io.ReadAll(f)
-				f.Close()
-				if err != nil {
-					writeErr(w, 400, "cannot read uploaded file")
-					return
-				}
-				if int64(len(content)) > a.cfg.MaxItemBytes {
-					writeErr(w, 413, fmt.Sprintf("file %q exceeds max %d bytes", fh.Filename, a.cfg.MaxItemBytes))
-					return
-				}
-				contentStr := string(content)
-				if err := a.store.InsertCanItem(canID, fh.Filename, contentStr, detectContentType(fh.Filename, content), nil, nil, &contentStr, now); err != nil {
-					writeErr(w, 500, "db error")
-					return
-				}
-				itemCount++
-			}
-		}
-	}
-
-	if itemCount == 0 {
-		a.store.DeleteCan(canID)
-		writeErrCode(w, 400, "content_empty", "can needs at least one item (files or json_items)")
-		return
-	}
-
-	writeJSON(w, 201, map[string]any{
-		"id": canID, "url": "/can/" + canID, "items": itemCount,
-	})
-}
-
-// 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 {
-	case strings.HasSuffix(lower, ".png"):
-		return "image/png"
-	case strings.HasSuffix(lower, ".jpg"), strings.HasSuffix(lower, ".jpeg"):
-		return "image/jpeg"
-	case strings.HasSuffix(lower, ".gif"):
-		return "image/gif"
-	case strings.HasSuffix(lower, ".webp"):
-		return "image/webp"
-	case strings.HasSuffix(lower, ".pdf"):
-		return "application/pdf"
-	}
-	if len(content) > 8 && content[0] == 0x89 && content[1] == 'P' {
-		return "image/png"
-	}
-	return "text/plain"
-}
-
-func (a *apiServer) handleGetCan(w http.ResponseWriter, r *http.Request) {
-	id := chi.URLParam(r, "id")
-	can, err := a.store.GetCan(id)
-	if err != nil {
-		writeErr(w, 500, "db error")
-		return
-	}
-	if can == nil {
-		writeErr(w, 404, "can not found")
-		return
-	}
-	if can.ExpiresAt.Valid && can.ExpiresAt.Int64 < time.Now().Unix() {
-		writeErr(w, 404, "can expired")
-		return
-	}
-	if can.PasswordHash.Valid {
-		pw := r.Header.Get("X-Paste-Password")
-		if pw == "" || !store.CheckPassword(can.PasswordHash.String, pw) {
-			writeErr(w, 401, "password required")
-			return
-		}
-	}
-	items, err := a.store.ListCanItems(can.ID)
-	if err != nil {
-		writeErr(w, 500, "db error")
-		return
-	}
-	type itemMeta struct {
-		ID          string  `json:"id"`
-		Title       *string `json:"title"`
-		ContentType string  `json:"content_type"`
-		Size        int     `json:"size"`
-		URL         string  `json:"url"`
-	}
-	metas := make([]itemMeta, 0, len(items))
-	for _, it := range items {
-		metas = append(metas, itemMeta{
-			ID: it.ID, Title: store.NullStrPtr(it.Title), ContentType: it.ContentType,
-			Size: len(it.Content), URL: "/api/pastes/" + it.ID,
-		})
-	}
-	writeJSON(w, 200, map[string]any{
-		"id": can.ID, "title": store.NullStrPtr(can.Title), "visibility": can.Visibility,
-		"created_at": can.CreatedAt, "items": metas,
-	})
-}
-
-func (a *apiServer) handleCanItem(w http.ResponseWriter, r *http.Request) {
-	id := chi.URLParam(r, "item")
-	row, err := a.store.GetPaste(id)
-	if err != nil || row == nil {
-		writeErr(w, 404, "item not found")
-		return
-	}
-	// must belong to a can
-	if !row.CanID.Valid {
-		writeErr(w, 404, "not a can item")
-		return
-	}
-	// 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")
-		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) {
-		ct = "text/plain; charset=utf-8"
-	}
-	w.Header().Set("Content-Type", ct)
-	w.Header().Set("X-Content-Type-Options", "nosniff")
-	w.Write([]byte(row.Content))
-}

internal/api/cans_expiry_test.go

@@ -1,45 +0,0 @@
-package api
-
-import (
-	"net/http/httptest"
-	"testing"
-)
-
-// #60: the cans API must clamp expires_in at the boundary exactly like the
-// pastes API — reject zero/negative durations and anything over the 1-year
-// UI cap, accept the exact boundaries.
-func TestCreateCanExpiryBounds(t *testing.T) {
-	s := testServer(t)
-	h := s.routes()
-
-	cases := []struct {
-		expiresIn string
-		wantCode  int
-	}{
-		{"-1h", 400},    // negative
-		{"-0s", 400},    // negative zero
-		{"0s", 400},     // zero
-		{"1ns", 400},    // positive but below the 1-minute floor
-		{"59s", 400},    // just under the floor
-		{"1m", 201},     // exactly the floor
-		{"90s", 201},    // just over the floor
-		{"8760h", 201},  // exactly 1 year
-		{"8785h", 400},  // 1 year + 1 day: over the cap
-		{"87600h", 400}, // 10 years, the originally reported case
-	}
-	for _, c := range cases {
-		globalLimiter = newLimiter() // avoid create rate limit between cases
-		body, ct := multipartBody(t, map[string]string{
-			"json_items": `[{"title":"a.txt","content":"AAA"}]`,
-			"expires_in": c.expiresIn,
-		}, "files", "pic.txt", "file data")
-		req := httptest.NewRequest("POST", "/api/pastes/can", body)
-		req.Header.Set("Content-Type", ct)
-		rec := httptest.NewRecorder()
-		h.ServeHTTP(rec, req)
-		if rec.Code != c.wantCode {
-			t.Errorf("expires_in %q: got %d want %d (%s)",
-				c.expiresIn, rec.Code, c.wantCode, rec.Body.String())
-		}
-	}
-}

internal/api/cans_flow_test.go

@@ -1,414 +0,0 @@
-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, nil)
-	req.Header.Set("X-Paste-Password", "pw123")
-	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/cans_test.go

@@ -1,144 +0,0 @@
-package api
-
-import (
-	"bytes"
-	"encoding/json"
-	"mime/multipart"
-	"net/http/httptest"
-	"strings"
-	"testing"
-)
-
-func multipartBody(t *testing.T, fields map[string]string, fileField, fileName, fileContent string) (*bytes.Buffer, string) {
-	t.Helper()
-	var buf bytes.Buffer
-	w := multipart.NewWriter(&buf)
-	for k, v := range fields {
-		w.WriteField(k, v)
-	}
-	if fileField != "" {
-		fw, _ := w.CreateFormFile(fileField, fileName)
-		fw.Write([]byte(fileContent))
-	}
-	w.Close()
-	return &buf, w.FormDataContentType()
-}
-
-func TestCreateAndGetCan(t *testing.T) {
-	s := testServer(t)
-	h := s.routes()
-
-	body, ct := multipartBody(t, map[string]string{
-		"title":      "My can",
-		"json_items": `[{"title":"a.txt","content":"AAA"},{"title":"b.txt","content":"BBB"}]`,
-		"expires_in": "1h",
-	}, "files", "pic.txt", "file data")
-
-	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: got %d: %s", rec.Code, rec.Body.String())
-	}
-	var created struct {
-		ID    string `json:"id"`
-		Items int    `json:"items"`
-	}
-	json.Unmarshal(rec.Body.Bytes(), &created)
-	if created.Items != 3 {
-		t.Fatalf("expected 3 items, got %d", created.Items)
-	}
-
-	// get can
-	req = httptest.NewRequest("GET", "/api/cans/"+created.ID, nil)
-	rec = httptest.NewRecorder()
-	h.ServeHTTP(rec, req)
-	if rec.Code != 200 {
-		t.Fatalf("get can: got %d", rec.Code)
-	}
-	var can struct {
-		Items []struct{ ID string `json:"id"` } `json:"items"`
-	}
-	json.Unmarshal(rec.Body.Bytes(), &can)
-	if len(can.Items) != 3 {
-		t.Fatalf("expected 3 items in get, got %d", len(can.Items))
-	}
-
-	// fetch item
-	req = httptest.NewRequest("GET", "/api/cans/"+created.ID+"/items/"+can.Items[0].ID, nil)
-	rec = httptest.NewRecorder()
-	h.ServeHTTP(rec, req)
-	if rec.Code != 200 {
-		t.Fatalf("item fetch: got %d", rec.Code)
-	}
-}
-
-func TestEmptyCanRejected(t *testing.T) {
-	s := testServer(t)
-	h := s.routes()
-	body, ct := multipartBody(t, map[string]string{"title": "empty"}, "", "", "")
-	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 empty can, got %d", rec.Code)
-	}
-}
-
-func TestCanPasswordInheritedByItems(t *testing.T) {
-	s := testServer(t)
-	h := s.routes()
-
-	body, ct := multipartBody(t, map[string]string{
-		"title":      "locked",
-		"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)
-
-	// can without pw -> 401
-	req = httptest.NewRequest("GET", "/api/cans/"+created.ID, nil)
-	rec = httptest.NewRecorder()
-	h.ServeHTTP(rec, req)
-	if rec.Code != 401 {
-		t.Fatalf("expected 401, got %d", rec.Code)
-	}
-
-	// get item id with pw
-	req = httptest.NewRequest("GET", "/api/cans/"+created.ID, nil)
-	req.Header.Set("X-Paste-Password", "pw123")
-	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
-
-	// item without pw -> 401
-	req = httptest.NewRequest("GET", "/api/cans/"+created.ID+"/items/"+itemID, nil)
-	rec = httptest.NewRecorder()
-	h.ServeHTTP(rec, req)
-	if rec.Code != 401 {
-		t.Fatalf("item expected 401, got %d", rec.Code)
-	}
-
-	// item with pw -> 200
-	req = httptest.NewRequest("GET", "/api/cans/"+created.ID+"/items/"+itemID, nil)
-	req.Header.Set("X-Paste-Password", "pw123")
-	rec = httptest.NewRecorder()
-	h.ServeHTTP(rec, req)
-	if rec.Code != 200 {
-		t.Fatalf("item expected 200, got %d", rec.Code)
-	}
-	if !strings.Contains(rec.Body.String(), "sec") {
-		t.Fatalf("item content mismatch: %s", rec.Body.String())
-	}
-}

internal/api/cookie_set_test.go

@@ -1,7 +1,7 @@
 package api
 
-// #143: create responses must set the short-lived tok_<id> HttpOnly cookie
+// #143: create responses must set the short-lived tok_<id> HttpOnly+Secure
-// that the paste view reads for the one-time created banner.
+// cookie that the paste view reads for the one-time created banner.
 
 import (
 	"net/http"
@@ -29,6 +29,9 @@ func TestCreateSetsDeletionTokenCookie(t *testing.T) {
 			if !c.HttpOnly {
 				t.Error("tok_ cookie not HttpOnly")
 			}
+			if !c.Secure {
+				t.Error("tok_ cookie not Secure")
+			}
 			if c.MaxAge != 60 {
 				t.Errorf("tok_ cookie MaxAge = %d, want 60", c.MaxAge)
 			}

internal/api/issue105_errorcode_test.go

@@ -86,38 +86,3 @@ func TestErrorCodeRateLimited(t *testing.T) {
 	}
 	t.Fatalf("never got rate_limited, last code = %q", code)
 }
-
-func TestErrorCodeCanValidation(t *testing.T) {
-	h := testServer(t).routes()
-
-	post := func(fields map[string]string) *httptest.ResponseRecorder {
-		var b strings.Builder
-		for k, v := range fields {
-			b.WriteString("--B\r\nContent-Disposition: form-data; name=\"" + k + "\"\r\n\r\n" + v + "\r\n")
-		}
-		b.WriteString("--B--\r\n")
-		req := httptest.NewRequest("POST", "/api/pastes/can", strings.NewReader(b.String()))
-		req.Header.Set("Content-Type", "multipart/form-data; boundary=B")
-		rec := httptest.NewRecorder()
-		h.ServeHTTP(rec, req)
-		return rec
-	}
-
-	// bad visibility
-	if _, _, code := decodeErr(t, post(map[string]string{"title": "x", "visibility": "nope"})); code != "invalid_visibility" {
-		t.Fatalf("visibility code = %q, want invalid_visibility", code)
-	}
-
-	// invalid expiry
-	if _, _, code := decodeErr(t, post(map[string]string{"title": "x", "expires_in": "1s"})); code != "expiry_invalid" {
-		t.Fatalf("expiry code = %q, want expiry_invalid", code)
-	}
-
-	// slug taken on can create
-	if rec := postCreate(h, `{"content":"a","custom_slug":"can-slug"}`); rec.Code != 201 {
-		t.Fatalf("seed create: %d", rec.Code)
-	}
-	if _, _, code := decodeErr(t, post(map[string]string{"title": "x", "custom_slug": "can-slug", "json_items": `[{"title":"a","content":"b"}]`})); code != "slug_taken" {
-		t.Fatalf("can slug code = %q, want slug_taken", code)
-	}
-}

internal/api/server.go

@@ -1,5 +1,5 @@
 // Package api implements palette's REST handlers and the HTTP router:
-// pastes, cans, guess-language, rate limiting middleware, and the admin API.
+// pastes, guess-language, rate limiting middleware, and the admin API.
 package api
 
 import (
@@ -8,7 +8,6 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
-	"html/template"
 	"net/http"
 	"os"
 	"strconv"
@@ -18,7 +17,6 @@ import (
 	"github.com/go-chi/chi/v5"
 	"github.com/go-chi/chi/v5/middleware"
 
-	langpkg "palette/internal/lang"
 	"palette/internal/store"
 	"palette/internal/web"
 )
@@ -59,8 +57,7 @@ func writeErrCode(w http.ResponseWriter, status int, code, msg string) {
 	writeJSON(w, status, map[string]string{"error": msg, "code": code})
 }
 
-// createErrCode maps a store.CreatePaste/CreateCan error to its UI error
+// createErrCode maps a store.CreatePaste error to its UI error code (#105).
-// code (#105).
 func createErrCode(err error) string {
 	switch {
 	case errors.Is(err, store.ErrSlugTaken):
@@ -103,16 +100,8 @@ func (a *apiServer) routes() http.Handler {
 		r.Delete("/pastes/{id}/redeem", a.handleRedeemDeletion)
 		r.Get("/public", a.handleListPublic)
 		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 (#4): GET renders, POST unlocks (same flow as pastes)
-	r.Get("/can/{id}", a.handleCanPage)
-	r.Post("/can/{id}", a.handleCanPage)
-
 	// raw + #38 attachment serving
 	r.Get("/f/{aid}/{filename}", a.handleServeAttachment)
 	r.Get("/raw/{id}", a.handleRaw)
@@ -189,7 +178,7 @@ func viewerSentCookie(r *http.Request) bool {
 func setDeletionTokenCookie(w http.ResponseWriter, pasteID, token string) {
 	http.SetCookie(w, &http.Cookie{
 		Name: "tok_" + pasteID, Value: token, Path: "/",
-		MaxAge: 60, HttpOnly: true, SameSite: http.SameSiteLaxMode,
+		MaxAge: 60, HttpOnly: true, SameSite: http.SameSiteLaxMode, Secure: true,
 	})
 }
 
@@ -442,7 +431,6 @@ func (a *apiServer) handleListMine(w http.ResponseWriter, r *http.Request) {
 			"id": row.ID, "title": title, "language": lang, "type": displayType(lang, row.AttFilename),
 			"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})
@@ -462,8 +450,7 @@ func (a *apiServer) handleListPublic(w http.ResponseWriter, r *http.Request) {
 		items = append(items, map[string]any{
 			"id": row.ID, "title": title, "language": lang, "type": displayType(lang, row.AttFilename),
 			"created_at": row.CreatedAt, "view_count": row.ViewCount, "size": row.Size,
-			"custom_slug": store.NullStrPtr(row.CustomSlug),
+			"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})
@@ -548,130 +535,6 @@ func safeRawContentType(ct string) bool {
 	return false
 }
 
-func (a *apiServer) handleCanPage(w http.ResponseWriter, r *http.Request) {
-	id := chi.URLParam(r, "id")
-	can, err := a.store.GetCan(id)
-	if err != nil || can == nil {
-		http.NotFound(w, r)
-		return
-	}
-	if can.ExpiresAt.Valid && can.ExpiresAt.Int64 < time.Now().Unix() {
-		http.NotFound(w, r)
-		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 {
-		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)
-	}
-}
-
-func templateEsc(s string) string {
-	r := strings.NewReplacer("&", "&amp;", "<", "&lt;", ">", "&gt;")
-	return r.Replace(s)
-}
 
 func (a *apiServer) handlePasteView(w http.ResponseWriter, r *http.Request) {
 	h := a.webHandlers()

internal/api/validate.go

@@ -9,7 +9,7 @@ import (
 	"strings"
 )
 
-// #68 input-validation helpers. Paste/can payloads are size-capped and list
+// #68 input-validation helpers. Paste payloads are size-capped and list
 // endpoints get a single place where limit/offset are parsed and clamped.
 
 // maxRequestBody returns the HTTP body cap for JSON create endpoints: the

internal/store/customslug.go

@@ -10,7 +10,7 @@ var slugRE = regexp.MustCompile(`^[a-zA-Z0-9][a-zA-Z0-9-_]{0,63}$`)
 
 // reserved words that would collide with routes
 var reservedSlugs = map[string]bool{
-	"api": true, "raw": true, "can": true, "cans": true, "public": true,
+	"api": true, "raw": true, "public": true,
 	"history": true, "static": true, "assets": true, "favicon.ico": true,
 	"new": true, "login": true, "logout": true, "admin": true, "settings": true,
 	"mine": true, "saved": true, "unlock": true, "guess": true, "f": true,
@@ -36,12 +36,5 @@ func (s *Store) SlugTaken(slug string) (bool, error) {
 	if err != nil {
 		return false, err
 	}
-	if n > 0 {
-		return true, nil
-	}
-	err = s.db.QueryRow(`SELECT COUNT(*) FROM paste_cans WHERE id = ?`, slug).Scan(&n)
-	if err != nil {
-		return false, err
-	}
 	return n > 0, nil
 }

internal/store/migration_test.go

@@ -0,0 +1,108 @@
+package store
+
+import (
+	"database/sql"
+	"path/filepath"
+	"testing"
+)
+
+// Cans feature removal (2026-10-16): opening a store on a pre-removal
+// database must drop the paste_cans table (only when empty) and the
+// pastes.can_id column. A non-empty paste_cans table is left in place.
+func TestMigrateDropsCansSchema(t *testing.T) {
+	dir := t.TempDir()
+
+	legacy := func(name string, canRows int) string {
+		db, err := sql.Open("sqlite", filepath.Join(dir, name))
+		if err != nil {
+			t.Fatalf("open raw db: %v", err)
+		}
+		defer db.Close()
+		stmts := []string{
+			`CREATE TABLE pastes (
+				id TEXT PRIMARY KEY, custom_slug TEXT UNIQUE, content TEXT NOT NULL,
+				content_type TEXT NOT NULL DEFAULT 'text/plain', language TEXT, title TEXT,
+				password_hash TEXT, expires_at INTEGER, burn_after_read INTEGER DEFAULT 0,
+				visibility TEXT NOT NULL DEFAULT 'public', can_id TEXT,
+				created_at INTEGER NOT NULL, deleted_at INTEGER,
+				view_count INTEGER NOT NULL DEFAULT 0, deletion_token TEXT
+			)`,
+			`CREATE TABLE paste_cans (
+				id TEXT PRIMARY KEY, title TEXT, description TEXT,
+				visibility TEXT NOT NULL DEFAULT 'public', password_hash TEXT,
+				created_at INTEGER NOT NULL, deleted_at INTEGER, expires_at INTEGER
+			)`,
+			`ALTER TABLE paste_cans ADD COLUMN viewer_id TEXT`,
+			`INSERT INTO pastes (id, content, content_type, visibility, can_id, created_at)
+				VALUES ('p1', 'x', 'text/plain', 'public', NULL, 1)`,
+		}
+		for _, q := range stmts {
+			if _, err := db.Exec(q); err != nil {
+				t.Fatalf("seed %q: %v", q, err)
+			}
+		}
+		for i := 0; i < canRows; i++ {
+			if _, err := db.Exec(`INSERT INTO paste_cans (id, created_at) VALUES (?, 1)`, string(rune('a'+i))); err != nil {
+				t.Fatalf("seed can row: %v", err)
+			}
+		}
+		return filepath.Join(dir, name)
+	}
+
+	intCol := func(s *Store, table, col string) int {
+		var n int
+		s.db.QueryRow(`SELECT COUNT(*) FROM pragma_table_info(?) WHERE name = ?`, table, col).Scan(&n)
+		return n
+	}
+	tableExists := func(s *Store, table string) bool {
+		var n int
+		s.db.QueryRow(`SELECT COUNT(*) FROM sqlite_master WHERE type='table' AND name=?`, table).Scan(&n)
+		return n > 0
+	}
+
+	// Empty paste_cans: table and column both dropped.
+	s1, err := OpenStore(legacy("empty.db", 0))
+	if err != nil {
+		t.Fatalf("open: %v", err)
+	}
+	defer s1.db.Close()
+	if tableExists(s1, "paste_cans") {
+		t.Error("paste_cans still exists after migrate (was empty; should be dropped)")
+	}
+	if intCol(s1, "pastes", "can_id") != 0 {
+		t.Error("pastes.can_id still exists after migrate; should be dropped")
+	}
+	// The store still works end to end.
+	if _, err := s1.CreatePaste(&Paste{Content: "hello", Visibility: "public"}); err != nil {
+		t.Fatalf("create paste on migrated db: %v", err)
+	}
+	if got := s1.QueryInt(`SELECT COUNT(*) FROM pastes`); got != 2 {
+		t.Errorf("pastes count = %d, want 2", got)
+	}
+
+	// Non-empty paste_cans: table kept, can_id still dropped.
+	s2, err := OpenStore(legacy("full.db", 2))
+	if err != nil {
+		t.Fatalf("open: %v", err)
+	}
+	defer s2.db.Close()
+	if !tableExists(s2, "paste_cans") {
+		t.Error("non-empty paste_cans was dropped; must be kept until cleaned")
+	}
+	if intCol(s2, "pastes", "can_id") != 0 {
+		t.Error("pastes.can_id still exists after migrate; should be dropped")
+	}
+
+	// Fresh database: neither the table nor the column is ever created.
+	s3, err := OpenStore(filepath.Join(dir, "fresh.db"))
+	if err != nil {
+		t.Fatalf("open fresh: %v", err)
+	}
+	defer s3.db.Close()
+	if tableExists(s3, "paste_cans") {
+		t.Error("fresh db created paste_cans")
+	}
+	if intCol(s3, "pastes", "can_id") != 0 {
+		t.Error("fresh db created pastes.can_id")
+	}
+}

internal/store/store.go

@@ -32,7 +32,6 @@ type Paste struct {
 	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"`
 	ExpiresAt   *int64  `json:"expires_at,omitempty"`
@@ -55,29 +54,15 @@ type PasteRow struct {
 	ReadsLimit    sql.NullInt64
 	ReadsUsed     int
 	Visibility    string
-	CanID         sql.NullString
 	CreatedAt     int64
 	DeletedAt     sql.NullInt64
 	ViewCount     int
 	Size          int
 	DeletionToken sql.NullString
 	ViewerID      sql.NullString
-	IsCan         bool // set on list rows that are cans (#4)
 	AttFilename   string // attachment filename when the paste is a file paste (#235); empty otherwise
 }
 
-type CanRow struct {
-	ID           string
-	Title        sql.NullString
-	Visibility   string
-	PasswordHash sql.NullString
-	CreatedAt    int64
-	DeletedAt    sql.NullInt64
-	ExpiresAt    sql.NullInt64
-	Description  sql.NullString
-	ViewerID     sql.NullString
-}
-
 type Store struct {
 	db   *sql.DB
 	blob BlobStore // #38: attachment byte storage (nil in some unit tests)
@@ -119,7 +104,6 @@ func (s *Store) migrate() error {
 		expires_at    INTEGER,
 		burn_after_read INTEGER DEFAULT 0,
 		visibility    TEXT NOT NULL DEFAULT 'public',
-		can_id        TEXT,
 		created_at    INTEGER NOT NULL,
 		deleted_at    INTEGER,
 		view_count    INTEGER NOT NULL DEFAULT 0,
@@ -128,22 +112,32 @@ deletion_token TEXT
 	CREATE INDEX IF NOT EXISTS idx_pastes_visibility_created ON pastes(visibility, created_at DESC);
 	CREATE INDEX IF NOT EXISTS idx_pastes_expires ON pastes(expires_at) WHERE expires_at IS NOT NULL;
 	CREATE INDEX IF NOT EXISTS idx_pastes_deleted ON pastes(deleted_at) WHERE deleted_at IS NOT NULL;
-	CREATE TABLE IF NOT EXISTS paste_cans (
-		id            TEXT PRIMARY KEY,
-		title         TEXT,
-		description   TEXT,
-		visibility    TEXT NOT NULL DEFAULT 'public',
-		password_hash TEXT,
-		created_at    INTEGER NOT NULL,
-		deleted_at    INTEGER,
-		expires_at    INTEGER
-	);
 	`)
 	s.db.Exec(`ALTER TABLE pastes ADD COLUMN deletion_token TEXT`) // ignore if exists
 	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)
+	// Cans feature removal (owner decision 2026-10-16): drop the leftover
+	// schema. paste_cans is only dropped when empty so no data is silently
+	// destroyed; a non-empty table is left in place and logged. The dormant
+	// pastes.can_id column is dropped too (prod verified clean 2026-10-16:
+	// zero rows referenced a can).
+	var tbl int
+	s.db.QueryRow(`SELECT COUNT(*) FROM sqlite_master WHERE type='table' AND name='paste_cans'`).Scan(&tbl)
+	if tbl > 0 {
+		var rows int
+		s.db.QueryRow(`SELECT COUNT(*) FROM paste_cans`).Scan(&rows)
+		if rows == 0 {
+			s.db.Exec(`DROP TABLE paste_cans`)
+		} else {
+			log.Printf("store: paste_cans still holds %d row(s); leaving the table in place (cans feature removed)", rows)
+		}
+	}
+	var col int
+	s.db.QueryRow(`SELECT COUNT(*) FROM pragma_table_info('pastes') WHERE name='can_id'`).Scan(&col)
+	if col > 0 {
+		s.db.Exec(`ALTER TABLE pastes DROP COLUMN can_id`)
+	}
 	s.db.Exec(`CREATE TABLE IF NOT EXISTS paste_views (
 		paste_id    TEXT NOT NULL,
 		viewer_id   TEXT NOT NULL,
@@ -290,10 +284,10 @@ func (s *Store) CreatePaste(p *Paste) (*Paste, error) {
 }
 
 func (s *Store) GetPaste(idOrSlug string) (*PasteRow, error) {
-	row := s.db.QueryRow(`SELECT id, custom_slug, content, content_type, language, title, password_hash, expires_at, burn_after_read, visibility, can_id, created_at, deleted_at, view_count, deletion_token, viewer_id, reads_limit, COALESCE(reads_used, 0)
+	row := s.db.QueryRow(`SELECT id, custom_slug, content, content_type, language, title, password_hash, expires_at, burn_after_read, visibility, created_at, deleted_at, view_count, deletion_token, viewer_id, reads_limit, COALESCE(reads_used, 0)
 		FROM pastes WHERE (id = ? OR custom_slug = ?) AND deleted_at IS NULL`, idOrSlug, idOrSlug)
 	var r PasteRow
-	err := row.Scan(&r.ID, &r.CustomSlug, &r.Content, &r.ContentType, &r.Language, &r.Title, &r.PasswordHash, &r.ExpiresAt, &r.BurnAfterRead, &r.Visibility, &r.CanID, &r.CreatedAt, &r.DeletedAt, &r.ViewCount, &r.DeletionToken, &r.ViewerID, &r.ReadsLimit, &r.ReadsUsed)
+	err := row.Scan(&r.ID, &r.CustomSlug, &r.Content, &r.ContentType, &r.Language, &r.Title, &r.PasswordHash, &r.ExpiresAt, &r.BurnAfterRead, &r.Visibility, &r.CreatedAt, &r.DeletedAt, &r.ViewCount, &r.DeletionToken, &r.ViewerID, &r.ReadsLimit, &r.ReadsUsed)
 	if err == sql.ErrNoRows {
 		return nil, nil
 	}
@@ -301,19 +295,15 @@ func (s *Store) GetPaste(idOrSlug string) (*PasteRow, error) {
 }
 
 // ListPublic backs /api/public and the public listing page. Visibility rules
-// mirror the history page: only non-deleted, non-expired, non-can pastes are
+// mirror the history page: only non-deleted, non-expired pastes are listed,
-// listed, and password-protected pastes are excluded at the query level
+// and password-protected pastes are excluded at the query level (#65) so
-// (#65) so their metadata (title, slug, existence) never leaks.
+// their metadata (title, slug, existence) never leaks.
 func (s *Store) ListPublic(limit, offset int) ([]PasteRow, int, error) {
-	rows, err := s.db.Query(`SELECT p.id, p.custom_slug, p.content_type, p.language, p.title, p.visibility, p.created_at, p.view_count, LENGTH(p.content), 0, COALESCE(a.filename, '')
+	rows, err := s.db.Query(`SELECT p.id, p.custom_slug, p.content_type, p.language, p.title, p.visibility, p.created_at, p.view_count, LENGTH(p.content), COALESCE(a.filename, '')
 		FROM pastes p
 		LEFT JOIN attachments a ON a.paste_id = p.id
-		WHERE p.visibility='public' AND p.deleted_at IS NULL AND p.can_id IS NULL AND p.password_hash IS NULL AND (p.expires_at IS NULL OR p.expires_at > ?)
+		WHERE p.visibility='public' AND p.deleted_at IS NULL AND p.password_hash IS NULL AND (p.expires_at IS NULL OR p.expires_at > ?)
-		UNION ALL
+		ORDER BY p.created_at DESC LIMIT ? OFFSET ?`, time.Now().Unix(), limit, offset)
-		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
 	}
@@ -322,34 +312,27 @@ func (s *Store) ListPublic(limit, offset int) ([]PasteRow, int, error) {
 	for rows.Next() {
 		var r PasteRow
 		var cs, lang, title sql.NullString
-		var isCan int
+		if err := rows.Scan(&r.ID, &cs, &r.ContentType, &lang, &title, &r.Visibility, &r.CreatedAt, &r.ViewCount, &r.Size, &r.AttFilename); err != nil {
-		if err := rows.Scan(&r.ID, &cs, &r.ContentType, &lang, &title, &r.Visibility, &r.CreatedAt, &r.ViewCount, &r.Size, &isCan, &r.AttFilename); 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 (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 > ?))
+	s.db.QueryRow(`SELECT COUNT(*) FROM pastes WHERE visibility='public' AND deleted_at 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()).Scan(&total)
-		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 p.id, p.custom_slug, p.language, p.title, p.visibility, p.created_at, p.view_count, LENGTH(p.content), 0, COALESCE(a.filename, '')
+	rows, err := s.db.Query(`SELECT p.id, p.custom_slug, p.language, p.title, p.visibility, p.created_at, p.view_count, LENGTH(p.content), COALESCE(a.filename, '')
 		FROM pastes p
 		LEFT JOIN attachments a ON a.paste_id = p.id
-		WHERE p.viewer_id = ? AND p.deleted_at IS NULL AND p.can_id IS NULL AND (p.expires_at IS NULL OR p.expires_at > ?)
+		WHERE p.viewer_id = ? AND p.deleted_at IS NULL AND (p.expires_at IS NULL OR p.expires_at > ?)
-		UNION ALL
+		ORDER BY p.created_at DESC LIMIT ? OFFSET ?`, viewerID, time.Now().Unix(), limit, offset)
-		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
 	}
@@ -358,18 +341,15 @@ func (s *Store) ListMine(viewerID string, limit, offset int) ([]PasteRow, int, e
 	for rows.Next() {
 		var r PasteRow
 		var cs, lang, title sql.NullString
-		var isCan int
+		if err := rows.Scan(&r.ID, &cs, &lang, &title, &r.Visibility, &r.CreatedAt, &r.ViewCount, &r.Size, &r.AttFilename); err != nil {
-		if err := rows.Scan(&r.ID, &cs, &lang, &title, &r.Visibility, &r.CreatedAt, &r.ViewCount, &r.Size, &isCan, &r.AttFilename); 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 (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 > ?))
+	s.db.QueryRow(`SELECT COUNT(*) FROM pastes WHERE viewer_id = ? AND deleted_at 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
 }
 
@@ -432,8 +412,6 @@ func (s *Store) IncrementViews(id, viewerID string, burnWindowMinutes int) bool
 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)
 }
@@ -490,92 +468,6 @@ func (s *Store) HardDelete(id string) {
 	s.db.Exec(`DELETE FROM pastes WHERE id = ?`, id)
 }
 
-// CreateCan inserts a paste_can row with optional custom slug (parity with
-// 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)
-}
-
-// InsertCanItem adds an item paste belonging to a can.
-func (s *Store) InsertCanItem(canID, title, content, contentType string, language *string, expiresAt, binary *string, now int64) error {
-	// language/expiresAt unused here for now; content stored as text (binary-safe in sqlite)
-	_, err := s.db.Exec(`INSERT INTO pastes
-		(id, content, content_type, language, title, visibility, can_id, created_at)
-		VALUES (?,?,?,?,?,?,?,?)`,
-		genSlug(6), content, contentType, language, &title, "unlisted", canID, now)
-	_ = expiresAt
-	_ = binary
-	return err
-}
-
-func (s *Store) GetCan(id string) (*CanRow, error) {
-	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)
-	var c CanRow
-	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
-	}
-	return &c, err
-}
-
-func (s *Store) ListCanItems(canID string) ([]PasteRow, error) {
-	rows, err := s.db.Query(`SELECT id, custom_slug, content, content_type, language, title, password_hash, expires_at, burn_after_read, visibility, can_id, created_at, deleted_at, view_count
-		FROM pastes WHERE can_id = ? AND deleted_at IS NULL ORDER BY created_at ASC`, canID)
-	if err != nil {
-		return nil, err
-	}
-	defer rows.Close()
-	var out []PasteRow
-	for rows.Next() {
-		var r PasteRow
-		if err := rows.Scan(&r.ID, &r.CustomSlug, &r.Content, &r.ContentType, &r.Language, &r.Title, &r.PasswordHash, &r.ExpiresAt, &r.BurnAfterRead, &r.Visibility, &r.CanID, &r.CreatedAt, &r.DeletedAt, &r.ViewCount); err != nil {
-			return nil, err
-		}
-		out = append(out, r)
-	}
-	return out, nil
-}
-
 // GenSlug is the exported slug generator.
 func GenSlug(n int) string { return genSlug(n) }
 

internal/web/static/app.css

@@ -129,7 +129,7 @@ body {
 
 /* new paste page */
 .deck {
-  display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 16px;
+  display: grid; grid-template-columns: 1fr 300px; gap: 16px;
   padding: 16px 20px 20px; height: calc(100vh - 76px);
   max-width: 1400px; margin: 0 auto;
 }
@@ -694,26 +694,6 @@ a.admin-link:hover { color: var(--fg); text-decoration: underline; }
   .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); }
-/* #169: divider between the dropdown title and body must be persistent
-   (not hover dependent) and extend the full width of the card left and right */
-.can-item-body[open] summary {
-  border-bottom: 1px solid var(--border);
-  margin: 0 -14px 8px;
-  padding: 0 14px 8px;
-}
-.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; }
-
 /* ============================================================
    Styled controls (#123) — buttons, selects, checkboxes, radios
    match the custom URL box house pattern: 1px var(--border) on
@@ -892,7 +872,6 @@ button[type="submit"]:focus-visible,
 
 /* #139: CSP-safe replacements for inline style attributes (style-src 'self') */
 .hidden { display: none; }
-.can-page { max-width: 900px; width: 100%; }
 .col-a { width: 260px; } .col-b { width: 140px; } .col-c { width: 120px; }
 .col-d { width: 90px; } .col-d2 { width: 150px; } .col-e { width: 150px; }
 .col-f { width: 100px; } .col-g { width: 120px; }

internal/web/static/history.js

@@ -6,8 +6,8 @@ const t = PaletteTable.init({
   rowHtml: it =>
     `<tr class="row" data-href="/${t.esc(it.id)}"><td>` +
     (it.title
-      ? `<a class="paste-name" href="/${t.esc(it.id)}">${t.esc(it.title)}</a>${it.is_can ? ' <span class="badge" title="Can — bundle of items">can</span>' : ''}`
+      ? `<a class="paste-name" href="/${t.esc(it.id)}">${t.esc(it.title)}</a>`
-      : `<a class="slug paste-name" href="/${t.esc(it.id)}">${t.esc(it.id)}</a>${it.is_can ? ' <span class="badge" title="Can — bundle of items">can</span>' : ''}`) +
+      : `<a class="slug paste-name" href="/${t.esc(it.id)}">${t.esc(it.id)}</a>`) +
     `</td>` +
     `<td><span class="badge">${t.esc(it.type || 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/static/mine.js

@@ -18,8 +18,8 @@ const t = PaletteTable.init({
   rowHtml: it =>
     `<tr class="row" data-href="/${t.esc(it.id)}"><td>` +
     (it.title
-      ? `<a class="paste-name" href="/${t.esc(it.id)}">${t.esc(it.title)}</a>${it.is_can ? ' <span class="badge" title="Can — bundle of items">can</span>' : ''}`
+      ? `<a class="paste-name" href="/${t.esc(it.id)}">${t.esc(it.title)}</a>`
-      : `<a class="slug paste-name" href="/${t.esc(it.id)}">${t.esc(it.id)}</a>${it.is_can ? ' <span class="badge" title="Can — bundle of items">can</span>' : ''}`) +
+      : `<a class="slug paste-name" href="/${t.esc(it.id)}">${t.esc(it.id)}</a>`) +
     `</td>` +
     `<td><span class="badge">${t.esc(it.type || 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/can.html

@@ -1,36 +0,0 @@
-{{template "head" .}}
-{{template "topbar" .}}
-<div class="center">
-  <div class="float can-page">
-    <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/layout.html

@@ -1,6 +1,5 @@
 {{define "head"}}
 <meta charset="utf-8">
-<title>{{ pageTitle . }} · Palette</title>
 <meta name="viewport" content="width=device-width, initial-scale=1">
 <link rel="stylesheet" href="/static/app.css">
 <link rel="icon" type="image/svg+xml" href="/static/favicon.svg">

internal/web/web.go

@@ -1,5 +1,5 @@
-// Package web serves palette's HTML routes: paste pages, cans, unlock, and
+// Package web serves palette's HTML routes: paste pages, unlock, and the
-// the admin page. Templates and static assets are embedded in this package.
+// admin page. Templates and static assets are embedded in this package.
 package web
 
 import (
@@ -74,7 +74,6 @@ func New() (*UI, error) {
 		"humanSize":   humanSize,
 		"version":     func() string { return Version },   // #93: topbar version label
 		"defaultDark": func() bool { return DefaultDark }, // #127: server-configured default
-		"pageTitle":   pageTitle,                          // page <title> labels
 	}
 	t, err := template.New("").Funcs(funcs).ParseFS(tmplFS, "templates/*.html")
 	if err != nil {
@@ -83,38 +82,6 @@ func New() (*UI, error) {
 	return &UI{tmpl: t}, nil
 }
 
-// pageTitle returns the <title> label for the rendered page. Page data is
-// always a map with a "Page" key set by the handlers.
-func pageTitle(data any) string {
-	m, _ := data.(map[string]any)
-	page, _ := m["Page"].(string)
-	id, _ := m["ID"].(string)
-	title, _ := m["Title"].(string)
-	switch page {
-	case "new":
-		return "New paste"
-	case "public":
-		return "Public pastes"
-	case "saved":
-		return "Saved"
-	case "settings":
-		return "Settings"
-	case "paste":
-		if title != "" {
-			return title
-		}
-		return "Paste " + id
-	case "unlock":
-		return "Unlock " + id
-	case "can":
-		return "Can " + id
-	case "notfound":
-		return "Not found"
-	default:
-		return "Palette"
-	}
-}
-
 func humanSize(n int) string {
 	if n < 1024 {
 		return fmt.Sprintf("%d B", n)
@@ -144,29 +111,6 @@ func (h *Handlers) RenderNotFoundPage(w http.ResponseWriter, r *http.Request) {
 	h.renderNotFound(w, r, r.URL.Path)
 }
 
-// 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
@@ -402,7 +346,7 @@ func (h *Handlers) HandlePasteView(w http.ResponseWriter, r *http.Request) {
 				// the paste id under the server's random secret.
 				http.SetCookie(w, &http.Cookie{
 					Name: "pw_" + row.ID, Value: unlockToken(row.ID), Path: "/",
-					MaxAge: 3600, HttpOnly: true, SameSite: http.SameSiteLaxMode,
+					MaxAge: 3600, HttpOnly: true, SameSite: http.SameSiteLaxMode, Secure: true,
 				})
 				// re-render without lock, or redirect if ?next= was given (#26)
 				if next := r.FormValue("next"); next != "" {
@@ -436,7 +380,7 @@ func (h *Handlers) HandlePasteView(w http.ResponseWriter, r *http.Request) {
 	}
 	if justCreated && token != "" {
 		// one-time display of the deletion token via sessionStorage (#143)
-		http.SetCookie(w, &http.Cookie{Name: "tok_" + row.ID, Value: token, Path: "/", MaxAge: 60, HttpOnly: true, SameSite: http.SameSiteLaxMode})
+		http.SetCookie(w, &http.Cookie{Name: "tok_" + row.ID, Value: token, Path: "/", MaxAge: 60, HttpOnly: true, SameSite: http.SameSiteLaxMode, Secure: true})
 	}
 	// Count the view for real page renders, deduped per-viewer within the
 	// burn window (#95): a reload by the same vwr cookie doesn't inflate
@@ -499,7 +443,7 @@ func (h *Handlers) HandleAdminPage(w http.ResponseWriter, r *http.Request) {
 func (u *UI) Handlers() *Handlers { return &Handlers{UI: u} }
 
 // #59: security headers for rendered HTML pages. Applied wherever the
-// response is text/html (page templates and the inline can page); JSON API
+// response is text/html (page templates); JSON API
 // responses and /raw content pass through untouched.
 // #139: script-src and style-src no longer allow 'unsafe-inline'. All
 // previously-inline scripts moved to external files under static/ (page data