CANVAS: Share and Collaborate — live co-editing with presence, view-only links (§60, headline) #991
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opened 2026-10-03 07:10:10 +00:00 by kayg
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kayg/calternal#991
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Owner direction (2026-10-03, #509)
"Sharing/collab would be the most awesome feature, because Excalidraw's hosted product doesn't allow self-hosting, and this adds state to Excalidraw, the biggest missing part." Contract: DESIGN §60 "Share and Collaborate", §54 (Share vs Collaborate, public links view only), §61 history. Builds on #976.
Scope
Verification
Two- and three-browser e2e as Users (owner + collaborator + viewer): live strokes appear, presence shows, viewer cannot edit, revoke kicks the collaborator within the recheck window. Mac + iPad simulator screenshots.
Started #991 on
job/canvas-collab-991, Canvas core basebeb3bbf4b. Mergedorigin/dev; start HEAD isa2a95af2b0.Findings: Canvas core already validates author-bound events and rechecks recipient access for every frame/broadcast. The current web editor disables offline drawing; awareness renders cursors only; shared Canvas files fall back to Quick Look because the own-Home Note index cannot resolve recipient paths. Public Canvas collaboration sockets currently return 404. §61 requires a measured history encoding decision; this job must not choose one without that decision.
Work starts with reconnect-safe event retention and presence on the existing Canvas event path. No new dependencies are planned. Full multi-browser, adversarial, Mac interoperability and performance runs are reserved for the merge round under the latest verification policy.
Started #991 on
job/canvas-collab-991, Canvas core basebeb3bbf4b. Mergedorigin/dev; start HEAD isa2a95af2b0.Findings: Canvas core already validates author-bound events and rechecks recipient access for every frame/broadcast. The current web editor disables offline drawing; awareness renders cursors only; shared Canvas files fall back to Quick Look because the own-Home Note index cannot resolve recipient paths. Public Canvas collaboration sockets currently return 404. §61 requires a measured history encoding decision; this job must not choose one without that decision.
Work starts with reconnect-safe event retention and presence on the existing Canvas event path. No new dependencies are planned. Full multi-browser, adversarial, Mac interoperability and performance runs are reserved for the merge round under the latest verification policy.
Implemented and committed acknowledged Canvas events (
3dd2ef079) and recipient streams with live access and presence (281b527ae).Verified finding: the room baseline contains the drawing body without frontmatter. Recipient titles must come from the Notes index. The real-socket regression caught this and now passes: one collaborator event reaches a Viewer, downgrade sends
editable: false, revoke closes with code 1008, and Viewer edits do not persist.The web uses one User-scoped presence list, shared cursor springs, selection outlines, laser state, follow controls and an in-memory event outbox. A local recovery download preserves unsaved drawing after a lost grant or room epoch. Focused Vitest: 35 passed. Web check:
svelte-check found 0 errors and 0 warnings. Production screenshot capture is in progress.Decisions: use a server session frame (103) on the existing socket to report access and validated recipient source; use
/n/<Note ID>?owner=<User ID>for recipient navigation; cap the acknowledged outbox at 2 MiB, and budget two presence plus two drawing frames per second. No dependency or migration was added.Remaining scope: public Canvas rendering/updates, group recipients, live-card viewer resolution (#977), durable per-author history (§61/#975), and plain-JSON Canvas discovery from Shared. These prevent READY FOR MERGE until completed. Full matrices, Apple interoperability and performance measurements remain merge-round work per the latest verification policy.
Production evidence found a presence colour mismatch: Excalidraw 0.18's getClientColor hashes the collaborator ID and ignores Collaborator.color. Canvas avatars used the Notes palette, so Ari's avatar and cursor had different colours. The Canvas boundary now uses the renderer's identity hash for its Top row projection. Notes colour behaviour is unchanged. The same User keeps the same Canvas colour across reconnects and device widths. Focused web gates and refreshed production evidence are running.
READY FOR MERGE: no
Head:
6964681d783ee856ad123cbf1e4c696778bea7cf. Branch:job/canvas-collab-991. Base: approved Canvas corebeb3bbf4b. The initial origin/dev merge isa2a95af2b; the one final fetch/merge reported Already up to date. No push or deploy was run. #991 stays open.Built
Authenticated Canvas collaboration uses the core event validator, author identity and single room writer. Collaborate recipients open a live Canvas by immutable owner and Note IDs. Share recipients see the same scene without edit controls. The server reports access on the existing socket, removes edit access after downgrade and closes revoked Canvas connections with 1008. A three-socket regression checks scene fan-out, downgrade, revoke and refused Viewer edits.
Presence includes named cursors, selection outlines, laser state, one avatar row and follow. Remote cursors use the shared spring and reduced-motion setting. Escape stops follow from the avatar button. Canvas avatars match the renderer's identity-derived cursor colour. Presence contains no remote avatar or embed URL.
Drawing edits stay in an in-memory outbox until the server echoes them. Reconnect sync runs before replay. Large edits drain as whole-element frames within the 2 MiB budget. Remote updates retain pending local edits. A local download preserves unsaved drawing after access loss or a room epoch change.
The existing Share dialog opens from Canvas. Recipient Copy link keeps owner, Note and element IDs. Shared Canvas Markdown opens from Files using a bounded frontmatter read. A ten-User benchmark profile covers 100 and 5,000 elements, authoritative echo p50/p95, a burst and server CPU/RSS.
Files
apps/web/src/lib/canvas/CanvasReact.tsx,CanvasView.svelte,canvas.css,scene.ts,scene.test.tsapps/web/src/lib/notes/collab.ts,collab.test.tsapps/web/src/lib/files/FilesBrowser.svelteapps/web/src/routes/notes/[id]/+page.sveltecrates/calternal-collab/src/session.rs,tests/canvas_shares.rs,README.mdapps/web/e2e/canvas-collab-991.mjsbench/canvas-collab-991.mjsFive atomic implementation/test commits follow the initial merge:
3dd2ef079,281b527ae,5e6139a96,cb8dea270,6964681d7. No dependency or migration was added. Doc comments were read before this report.UX gaps closed
Shared Canvas files no longer fall back to Quick Look when their Markdown frontmatter has a stable ID. Share viewers cannot enter Edit. Downgrade removes Edit; revoke stops reconnect retries. Pending drawings survive connection loss in memory and offer a local recovery download. Escape works while follow controls own focus. Upstream duplicate avatars are hidden. Avatar, cursor and selection colours use the same identity. Large edits do not wait forever on an oversized aggregate event.
Known gaps / UX gaps left
This is an authenticated collaboration slice, not all of #991. Public Canvas rendering and public live updates remain absent. Group recipients require Files Share support. Viewer-specific live cards remain #977 work. Durable per-author history and undo await the measured §61/#975 encoding decision; current source Versions are not that history. Plain JSON
.excalidrawdiscovery from Shared remains absent. Recipient PNG/SVG export is absent. The outbox is not persisted across browser closure; a single element above the core event limit stays unsaved and can be downloaded. Real iPad/Pencil, real macOS, offline multi-browser conflict scenarios and follow camera motion still need merge-round review.Decisions
The socket uses session frame 103 for server-confirmed access and the validated recipient source. Recipient navigation uses
/n/<Note ID>?owner=<User ID>; the owner hint is not authorization. The outbox is bounded at 2 MiB and stays in memory. Drawing and presence each use at most two frames per second. Follow uses the peer's viewport centre and zoom; local gestures or Escape stop it. Excalidraw 0.18 ignores its colour field, so the Canvas boundary mirrors its small identity hash for avatar colour. Notes colour behaviour is unchanged. No history encoding was selected without §61's measurement decision.Verification
Rust gates used
CARGO_PROFILE_DEV_DEBUG=line-tables-only CARGO_INCREMENTAL=0 CARGO_BUILD_JOBS=4and the preset job target.cargo fmt --checkexited 0 with no output. The per-crate clippy and test commands passed. The full collab suite preceded the recipient title fix; the new focused socket regression passed after that fix. Full gate logs stay inartifacts/.Verbatim retained output follows.
cargo clippy -p calternal-collab --all-targets -- -D warningscargo test -p calternal-collabcargo test -p calternal-collab --test canvas_shares -- --test-threads=2cargo clippy -p calternal-server --all-targets -- -D warningscargo test -p calternal-server -- --test-threads=4bun run checkbunx vitest run src/lib/notes/collab.test.ts src/lib/canvas/scene.test.ts --maxWorkers=2production focused browser regressionbun run buildexited 0. Existing bundle/import.meta warnings remain. Script syntax checks andgit diff --checkpassed. Performance was not measured: the latest branch verification policy reserves measurements for performance issues.docs/perf/baseline.jsonhas no ten-User Canvas metric, so no performance comparison is claimed.For the merge round
Run with its prepared server and authorization fixture environment:
cd apps/web && bun run test -- --maxWorkers=2: full web regression suite.bun apps/web/e2e/canvas-976.mjsandbun apps/web/e2e/share.mjs: core and Share cross-feature regression.bun apps/web/e2e/canvas-collab-991.mjs: repeat this focused production regression against the combined server.bash tests/adversarial/run-split.sh: full authorization, cross-User and robustness matrices, including room isolation. No full hostile-input matrix was run in this branch job.flock /root/perf.lock bash -c 'uptime; bun bench/canvas-collab-991.mjs --json artifacts/canvas-collab-profile.json'. Establish ten-User baseline numbers and confirm burst behaviour. Never compile there.Production screenshots
Thirty macOS-emulated production screenshots cover owner, Collaborate recipient, Share recipient, Canvas menu and the existing Share dialog at 390, 820 and 1440 px in light and dark. Claude/orchestrator owns the visual quality review. The earlier attachment set preceded the colour correction; use the following refreshed set.
Cleanup completed. Web build output was deleted. Working tree is clean.
cargo cleanoutput:Continuing round 2 on
job/canvas-collab-991, base/head6964681d7. Remaining work: public Canvas views, Group sharing, Shared discovery, recipient exports.Finding: the repository has no instance Group or Group membership security-state tables/API (only photo grouping and OIDC role mapping). Group sharing needs the instance Group primitive; I will leave that gap explicit rather than create a Canvas-only Group authority that changes another crate’s design.
Decision: use the existing public-link authorization for a bounded, read-only Canvas projection, with private references replaced on the server before returning JSON. Live cards and history remain #977/#975. Full adversarial matrices and full e2e belong to the merge round under the current verification policy.
Round 2 findings and progress:
.excalidrawfiles have no frontmatter. Authorized listings now include the indexed Canvas Note ID; the browser uses it directly.Commits so far:
a898c4f70,24b1982f9,f86a35c3e. One required merge oforigin/devcompleted (843af4f05). Group sharing still needs the missing Instance Group authority; no Canvas-only Group store was introduced. Public reads use 2-second serial conditional requests and stop in hidden pages; the public hot path was added to the existing #991 bench profile. Measurements and full matrices remain merge-round work under the current verification policy.READY FOR MERGE: no
Head:
b17f3f038523bb710fcd5464da2a5640f94f290fonjob/canvas-collab-991.Round 2 builds public Canvas views, Shared JSON discovery and recipient exports. Group sharing remains unfinished because there is no Instance Group or membership authority in this repository. A Canvas-only Group store would change Security state design outside this job.
Built
Files
UX gaps closed
UX gaps left / known gaps
Decisions
843af4f05. No dependency or migration was added.Verification (gate output verbatim)
cargo fmt --checkexited 0 with no output.core:
notes:
files:
collab:
server:
Web and registry:
The server suite initially found a missing 429 declaration on the new public route. The declaration was fixed; the focused regression and final server suite passed. New browser assertions were corrected for canonical /notes routing, shortened filenames and anonymous OS theme behavior. Existing test expectations were not changed.
For the merge round
bun run --cwd apps/web test --maxWorkers=2: full web regression coverage.bash tests/adversarial/run-split.sh: authz, cross-user and robustness matrices, including new export and public-read classification rows. Focused live regression covers public POST refusal and mid-session Share/public-link revocation in this branch.bun apps/web/e2e/canvas-976.mjsandbun apps/web/e2e/canvas-export-976.mjs: full owner drawing/export behavior with the combined branches.flock ~/.local/state/codex-jobs/calternal/macvm.lock, as required by the shared verification policy. No Mac GUI session or staging deployment ran in this job.flock /root/perf.lock bash -c 'cat /proc/loadavg; bun bench/canvas-collab-991.mjs --json artifacts/canvas-collab-profile.json'. No measurements ran here under the current policy. There is no public Canvas projection baseline in docs/perf/baseline.json; numbers remain unmeasured.Focused production browser output (verbatim)
Production build exited 0. Type checks passed after the viewport-motion and shared-tooltip changes. The screenshot set is from that final build. Screenshot-only settling waits do not delay product content or input. Icon/label pairs were inspected at original screenshot resolution; visual approval remains with the orchestrator.
Cleanup (verbatim)
Generated web build, renderer and font output was removed.
git status --shorthas no output. No push or deployment ran.Evidence
All 48 macOS production screenshots and gate logs
Merge round 7c starts on
job/merge-round-7c, base4082669f7. The current owner job authorizes integration and full verification; it supersedes the original read-only #867 brief.Canvas order: core → files → collab → Sketch → Pencil → cards. Migrations follow the combined 7b schema. No pushes or deploys. Final report will include verbatim gates, screenshots, defensive renderer review and staging readiness.
Finished merge-round-7c integration at
094d22e44507bf8bdd87dd8ffd460c254cb6329c. READY FOR STAGING: no.Three distinct Users opened live editor/viewer scenes. Live edits, public placeholders/pan/zoom and recipient PNG/SVG exports passed. The full flow stops on the retained long-URL expectation after Shared discovery opens the correct stable /n/ identity. Revoke/reconnect and recipient screenshots remain incomplete.
Production macOS evidence is attached to #867: 390/820/1440, light/dark. Screenshots remain outside git.
Focused Canvas viewer authority regression:
Svelte check:
The full report, renderer boundary review, migration upgrade evidence, exact gate excerpts and decisions are in
docs/audits/merge-round-7c.mdand the final #867 comment. Staging blockers include the Notes process SIGSEGV after 278 passing assertions (#1069), stale performance exception pins, the retained thumbnail test conflict, Sketch save and unfinished verification. No pushes or deployments.