MAIL M2: Mail mode — reader, threads, safe HTML, search (DESIGN §45) #396
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opened 2026-09-29 04:40:50 +00:00 by kayg
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MAIL M2: the Mail mode — reader and search (DESIGN §45, build order: accounts and sync (M1, done #313) → reader and search → send and actions (M3))
Build exactly what DESIGN §45 decided for reading (read the whole section and docs/research/mail-plugin.md, mail-threads.md):
Gates before release (§45): hostile MIME/HTML tests (malformed MIME, huge parts, nested multiparts, charset tricks, CSS/HTML exploits, remote-content leaks), cross-User authorization tests, sync recovery tests, one adversarial round, and a measured "newest mail visible" time and search latency on a large mailbox (e.g. 100k messages). Production-build screenshots at 390/820/1440, light and dark.
Started job/mail-m2 from
00015e652a. Reading DESIGN §45, mail research, M1 projection, and existing web/search integration before implementation. I will report concrete findings and gate output here.Finding: M1 sync already stores a stable UUID and owner-scoped live membership for each message, but the projection has no HTML or full-text index. I am adding sanitized HTML as derived data and an owner-filtered FTS projection. The reader must still use a sandboxed iframe and network-denying CSP. DESIGN §45 marks reply forks OPEN, so I will not infer them from subjects.
Finding: M1's generated OpenAPI contract incorrectly described Mail paging fields as path parameters. The route already reads them from the query string. I changed the schema annotation to Query and regenerated the client; the web type check now reports 0 errors and 0 warnings. The first web test run found one new direct date-format call in MailView; I replaced it with the shared formatter, and its reuse-gate test now passes.
Finding: M1's keyset page cursor used the extra unreturned row, so opening the next page skipped that message. I changed the cursor to the last returned row and added a 3-message/2-row regression test. This matters for Mail's “Load older messages” control and stable newest-first reading.
Resumed job/mail-m2 at
00015e65after the service-tier restart. The worktree contains an uncommitted Mail reader and search slice. I am validating and committing that slice, then will merge dev once and run the final gates and one adversarial round. No merge into dev or deploy is planned.Finding: the first Mail mode draft combined only the first 50 messages from each account and had no unified cursor. A User with a large mailbox could not reach older unified Inbox messages. I added an Index query that pages by received time and stable message ID across enabled accounts, live folder generations and the authenticated User. The Mail crate suite passes (21 tests); API client generation and web integration are in progress.
Category decision (DESIGN §45 does not specify precedence): receipt subject patterns take precedence, then standard List headers, then Auto-Submitted and sender-address/domain notification signals, then People. The User's per-sender correction overrides every guess and is persisted as Security state. The Mail crate suite passes (22 tests). I also constrained the search FTS update trigger to text fields so category corrections do not reindex each message body.
Thread decision: the Index assigns a stable thread ID from the provider thread ID when present, otherwise from normalized Message-ID, References and In-Reply-To keys within one connected account. When two partial graphs meet, old thread IDs remain valid through an alias. Existing M1 messages have only their own Message-ID stored, so pre-M2 replies can join when they are refetched; historical groups without a refetch remain a known migration gap. A test covers merge and old-link resolution. Remote HTML images remain stripped by default; per-sender consent permits only absolute HTTPS image sources in sanitized HTML and a CSP-limited frame. The Mail crate suite passes (25 tests).
Performance finding on a local 100k-message Mail Index fixture (shared build host, 25 warmed SQL samples): the first unified Inbox query had p50 279.17 ms / p95 371.01 ms because GROUP BY and ORDER BY built temporary trees. A correlated live-membership pick measured p50 0.18 ms / p95 0.26 ms on the same fixture. Common-term Mail search with received-time sorting had p50 259.86 ms / p95 398.58 ms; bounded FTS hit order measured p50 0.06 ms / p95 0.30 ms. I changed those two queries and am running crate tests. These are Index query timings, not end-to-end newest-mail-visible timings.
Backend finding: at 100,000 projected messages, the original unified Inbox query took p50 279.17 ms / p95 371.01 ms and the original common-term FTS query took p50 259.86 ms / p95 398.58 ms on 25 warm SQLite samples. The indexed live-membership page and bounded FTS stream measured p50 0.664 ms / p95 1.161 ms and p50 0.268 ms / p95 0.406 ms on the same fixture. These are Index query timings, not browser newest-mail-visible timings. The first SQL revision had a malformed owner bind; Mail crate tests caught it and it was fixed before commits
11ccd10aand4c5cbd8c. Current Mail crate gate: 28 passed, 0 failed. A fake IMAP session now supplies hostile multipart HTML and verifies text extraction and sanitized storage.Search design finding: DESIGN §32 specifies Tantivy for server-side content in the universal palette. The existing Indexer API accepts Home file paths and has no public plugin-document writer. This branch currently exposes Mail full text through the shared SearchProvider and Mail facet, backed by a rebuildable FTS5 projection in the Mail Index. This meets cross-account sender/subject/recipient/body lookup and the local 100k latency probe, but it is not the one Tantivy Index specified by §32. Moving Mail into Tantivy would require a new cross-crate indexing API; I am reporting that deviation rather than changing the Search crate's behavior inside this job.
Reader decision where §45 is silent: the saved per-sender image choice permits absolute HTTPS image sources in a scriptless, opaque-origin sandboxed iframe. The frame has a deny-by-default CSP and no-referrer policy. Links are stripped from the HTML and exposed as explicit, safe-scheme links outside the frame. There is no image proxy in this slice; a User who permits a sender's remote images makes direct HTTPS requests to that sender's image hosts. Tests cover blocked-by-default resources and hostile HTML/CSS.
Deep-link decision where §33/§45 give no Mail format parameter:
/mail/m/{id}?format=plainand/mail/t/{id}?format=plainrestore the reader's plain-text view. The HTML view is the default without that parameter. The format action updates the URL in place, and Copy link includes the plain view when selected.Post-merge design finding:
devadded DESIGN §48 (one search Index per User; structural isolation) and §49 (provider sign-in moves to Settings → Integrations, while Settings → Mail keeps service preferences). This M2 branch extends M1's shared SQLite Mail projection with owner-filtered reads and continues using M1's Settings → Mail account UI. The new sections require cross-feature migration work (#400/#407) outside this reader slice. The new decisions are now in this branch after the singlegit merge dev; I am listing the remaining conflicts with them in the final report.Production screenshot finding: the root
/mailview showed “Inbox” twice at 820/1440 px because the app chrome already supplies the mode title and MailView added a second root heading. I removed MailView's root heading while retaining its Copy link action. Sub-views keep their own title under the Mail chrome. I am rebuilding and recapturing 390/820/1440 light/dark after the change; no screenshot is committed to git.Production-build review evidence: 54 Mail screenshots, PNG ZIP. The archive includes Inbox empty and populated, category, folder, thread, message HTML and plain text, truncated body, and action menu at 390/820/1440 px in light and dark. The capture script asserted the rendered theme before every screenshot. The root Inbox screenshot reflects commit
16d78dfc, which removed the duplicated title. Screenshots are attached to this issue and are not in git.Post-merge production-build and real-server findings (2026-09-29):
/api/v1/searchroute returned HTTP 200 withtimed_out=trueand no hit in all five paced 100,000-message requests, p50 216.40 ms / p95 227.90 ms. One-message control returned the hit in all five requests, p50 36.90 ms / p95 69.20 ms. The shared Search route has a 200 ms provider deadline. This is a remaining search-at-scale gap; no 5xx or data loss was observed in the paced sample. The earlier unpaced 25-request run hit one 503 under concurrent host load and was stopped to avoid piling up work; its body was not captured.Mail API probe: anonymous access, Unicode and public-endpoint policy, malformed/oversized JSON, hostile IDs/cursors, and 24 parallel account/Inbox reads passed.16d78dfc.Scope audit before the final gate report: the branch implements the reader, sanitized HTML, sender-gated remote images, plain/flowed text, Print, categories, stable message/thread IDs, and Mail results in the shared search palette. #396 remains open because the message list is still per-message rather than grouped by thread; attachment listing and Save to Files are not implemented; and reader actions do not yet have CLI/MCP/WebMCP parity. The §45 reader preferences (read marking after about 1 s), oldest-unread jump, and new-message notice are also outstanding. I will include these gaps in the final report. No reply-fork work was attempted because §45 marks it OPEN.
Mail M2 branch report (2026-09-29)
Head:
16d78dfcb0on job/mail-m2, based on dev and merged from dev once. Pushed; no merge into dev.Built:
Files: crates/plugins/mail/{src,migrations,Cargo.toml}, apps/web/src/lib/mail, apps/web/src/routes/mail, navigation/search/sidebar integration, contracts/openapi.json, packages/api-client/src/generated.ts, tests/adversarial/mail_api.mjs, Cargo.lock.
Evidence:
Mail API probe: anonymous access, Unicode and public-endpoint policy, malformed/oversized JSON, hostile IDs/cursors, and 24 parallel account/Inbox reads passed.Gates (output quoted verbatim from the logs):
cargo fmt --check: exit 0, no output.cargo clippy --all-targets -- -D warnings: interrupted near the job time box, exit 130. Last output:cargo test: interrupted near the job time box, exit 130. It never acquired Cargo's build lock. Entire output:cargo test -p calternal-plugin-mail: exit 0 before the dev merge; dev did not modify Mail sources. Result lines:bun run check: exit 0 after the merge and final visual fix:bun run test: exit 1 on the final run because a ThemePicker keyboard submenu test exceeded its 5000 ms timeout under shared-host load. Result lines:The same full suite passed immediately before the visual-only heading fix:
The isolated ThemePicker test then passed:
Production
bun run build: exit 0:Post-merge
cargo build -p calternal-server: exit 0; the binary ran the screenshots, benchmark and adversarial probe.cargo clean: exit 0:apps/web/buildandapps/web/.svelte-kit/outputwere also removed.Known gaps:
Decisions where §45 was silent: category signal precedence is receipt > newsletter > notification > people; thread aliases preserve old links after References merges; remote images are direct HTTPS requests after sender consent;
?format=plainpreserves plain-reader deep links. Reply forks were left unbuilt because §45 marks them OPEN.Starting the mail-m2 resume on branch
job/mail-m2at16d78dfcb081fd9c5810f3fc04c5914d45b62c84. The worktree is clean. I am refreshingorigin/devbecause localdevis behind the visible #398 merge, then I will mergedevonce and resolve conflicts with both sides in mind.Merge finding: the refreshed dev tip was
b96693da1f24922778aba5652176a36aba30c500. Localdevis checked out in/home/kayg/Developer/calternal, so I merged the currentorigin/devtip once intojob/mail-m2instead of moving that other worktree's branch. The only conflict was the shared sidebar import: I kept MailSidebar and combined the newswipehelper import with Mail's existing gesture imports. Merge-resolution commit:44d21b72aaabf744d62fe53813148121a8e201fb.Parity finding: #395's source-backed adapter matrix is present on the refreshed dev tree. The initial merge commit tree did not contain its three tracked files, although
origin/devdid. I restoreddocs/parity-matrix.md,docs/parity-exceptions.json, andscripts/parity_matrix.pyfrom that dev tip ina56d3e86, so Mail reader adapters can use the checked matrix. #395's current generator records 156 pre-existing adapter gaps; I will limit this job to the Mail reader routes it touches.M2 findings and decisions:
MailView.sveltecompared message flags against a JavaScript string containing two literal backslashes. The Mail projection returns one\Seenflag, so a message could still look unread after its provider state changed. The reader now compares the same flag value as the API.I am running the Mail crate tests against these changes now.
The Mail CLI attachment download wrote the user-selected output path directly with
OpenOptions. That bypassed the filesystem confinement rule. I addedRoot::write_new_file_at_rootincalternal-fs, which creates one private new file relative to a held directory handle withopenat2andRESOLVE_BENEATH, and routed the Mail export through it. The helper rejects an existing destination and symlink. I will run thecalternal-fsandcalternal-clicrate gates.I added attachment Copy link actions and restored the selected attachment from a deep link. The Mail API has no separate attachment ID, so the link uses the stable message ID plus the provider section ID:
/mail/m/<message-id>?attachment=<section-id>or/mail/t/<thread-id>?attachment=<message-id>:<section-id>. Opening the link opens the attachment inspector and selects the item. I recorded this grammar indocs/DESIGN.mdand made WebMCP accept the same links.Finding #396: the one-second read timer could expire while the browser tab was hidden. It then discarded the timer without marking the message read when the User returned. MailView now cancels that interval and starts a fresh visible second when the reader becomes visible. A manual read-state change and route change also clear the pending timer. Web verification is pending.
Finding #396: the first
cargo clippy -p calternal-plugin-mail --all-targets -- -D warningspass reported six style warnings: two collapsible conditions inhtml.rs, one needless lifetime inroutes.rs, two collapsible conditions and onemanual_containsinsync.rs. I am applying the clippy suggestions so the required warning-free gate can pass.Search cause found on the 100k-message protocol: SQLx uses SQLite 3.51.3, whose plan started with
SEARCH mail_messages USING INDEX mail_messages_page (owner_id=?), then tested FTS across the owner's rows. Python's plan started with the FTS virtual-table match and used a rowid lookup. The Mail pool wait was only 1–8 ms; the query stage used 176–203 ms and timed out. The comparable pre-fix run returned p50 220.30 ms / p95 225.10 ms, 0/5 Mail hits, and 5/5 timeouts. I am forcing FTS to drive the Mail query while keeping the owner, enabled-account, and live-membership checks.mail-m2 status
The job reached its four-hour limit while
cargo clippy -p calternal-server --all-targets -- -D warningswas still compiling dependencies. I stopped further work at that limit. The server Clippy gate did not produce a final result,cargo test -p calternal-serverwas not run, and the one-time adversarial run and production screenshots were not completed. No screenshots were attached.Built and committed
calternal-fs.node --check; it was not run on a real server.Commits:
1d123b23,02213412,b7f30ae1,1402fa8b,52a52ca2,c9f285ff,12057292,21ba5163.Head:
21ba51632bf3ab2b2564ed5d95b094636928acab. The worktree is clean. No push or deploy was made. The requested one-timegit merge devwas already completed earlier in the job.Search benchmark
The same five-request, one-second-spaced protocol used a production web build and 100,000 seeded Mail messages.
220.30 ms, p95225.10 ms;0/5hits and5/5timed out.90.80 ms, p95592.40 ms;5/5hits and0/5timed out.20.183,21.552,64.001,78.607, and98.955 ms(p5064.001 ms, p9598.955 ms). The 592.40 ms client p95 includes one outlier while the server handler was 98.955 ms; client scheduling is a likely cause, but this is an inference.SCAN message_search_fts VIRTUAL TABLE INDEX 0:M6, then looks upmail_messagesby rowid. The old plan started withmail_messages_page(owner_id=?)and scanned the 100k messages before FTS matching.Gate output
cargo clippy -p calternal-plugin-mail --all-targets -- -D warnings:cargo test -p calternal-plugin-mail:cargo clippy -p calternal-fs --all-targets -- -D warnings:cargo test -p calternal-fs:cargo clippy -p calternal-cli --all-targets -- -D warnings:cargo test -p calternal-cli:bun run check:bun run test:python3 scripts/parity_matrix.py --check:cargo build -p calternal-serverpassed after the Mail search change. Server Clippy was interrupted at the time limit while still compiling dependencies (process exit143); no final Clippy output was produced. Server tests were not run.cargo fmtcompleted after the final Rust edits; a finalcargo fmt --checkwas not rerun.cargo cleanoutput:The production web build output was removed after use.
Decisions and known gaps
/mail/m/{message-id}?attachment={section-id}and/mail/t/{thread-id}?attachment={message-id}:{section-id}. They use stable message IDs and MIME section IDs.Resuming round 3 on branch job/mail-m2. Base SHA:
b96693da1f. Current head:21ba51632b. I am reviewing #395 parity integration and will merge dev once before final gates.Finding during the required dev merge: the job branch and dev both changed WebMCP registration/confirmations, CLI commands, layout confirmation state, and the parity generator/docs. The parity conflict is an add/add; I am taking dev's #395 generator and matrix as the base and folding Mail reader coverage into that shared framework.
The merged CLI reader surface is covered: cargo test -p calternal-cli passed 26 unit tests and 15 output-contract tests. The parity matrix now uses dev's generator and currently marks all M2 Mail reader routes across CLI, MCP and WebMCP.
Finding: the first final
cargo clippy -p calternal-server --all-targets -- -D warningsattempt could not compile because theRustEmbedfolderapps/web/build/was absent. The derive then leftFrontend::getunavailable. This is a generated production-asset prerequisite; I am building the web app before rerunning the server gates and probe. No source defect was indicated.Resuming Mail M2 round 3 on
job/mail-m2.Current HEAD:
adeb41074ebfe5190db1d854efd234211acbdb03.Current branch base from
origin/dev:43c1377c8fd3b1b495841446989a64156f8ae1e4.I am reviewing the existing #395 parity integration and Mail boundary probe, then I will finish the shared parity rows, run the requested API adversarial probe and capture the required production screenshots before final gates.
mail-m2 round 3: finished (resumed by Claude after the Codex usage limit)
Head:
8d19b921a6cd9d02f7eca39c0294018233460743onjob/mail-m2. The worktree is clean. No push, no merge into dev.State at resume
c1db3e2b4mergesorigin/devat369ab6a2f. It has no conflict markers.git diff origin/dev HEADshows only Mail M2 files, so no dev changes were lost.MailSection.svelteuses dev'sSettingsCardin all groups (#402).origin/devhas no newer commits, so no second merge was necessary.scripts/parity_matrix.py,docs/parity-matrix.md,docs/parity-exceptions.json). All the M2 Mail reader routes show CLI, MCP and WebMCP coverage. The regenerate check gives no diff.Done in this session
tests/adversarial/mail_api.mjs) against a server built from the merged tree. It passes. The first runs found:c87db6665):GET /api/v1/mail/threads/{id}/oldest-unreadanswered200 {"message":null}for another User's thread and for unknown thread IDs. The thread list and attachment routes answer 404 for these IDs, and the OpenAPI contract documents 404. No data leaked because the query is owner-scoped. The route now answers 404 when the caller cannot see the thread. Regression test:oldest_unread_hides_threads_the_caller_cannot_see.8d19b921a): a non-transient Mail Index error gave a generic 500 and wrote no log line. The error is now logged on the server withtracing::error!. The response stays generic.flags_jsonhad an invalid JSON escape, which caused the silent 500 above. The probe also sent{"read":true}to the remote-content route, and its Save to Files locator was ambiguous when there were 2 attachments. The probe now prints server diagnostics when it fails.malformed_headers_and_deep_multipart_nesting_still_sync. It uses broken encoded-words, an unknown charset, a header line with no colon, a 200 KiB header, a bad Date and 256 nestedmultipart/mixedlevels. Sync completes, the message enters the projection and the body stays bounded. The existing tests already cover huge parts, charset/CSS tricks, scripts,cid:and remote images.@importandurl()CSS exfiltration, remote images before consent,cid:loop) makes 0 remote requests before consent. After consent, only the sanitized HTTPS image loads. Another User's message, attachment, thread messages, thread attachments, oldest-unread, read-state and image-consent routes all answer 404. Another User's Mail does not appear in Search. Save to Files with a../../../../etc/passwdattachment name writes one safe path segment in the User's Home. The probe also sends hostile, malformed and oversized IDs and bodies, 24 parallel account reads and 24 parallel Inbox reads, and checks the 1-second visible read delay.mail-m2-round3-screenshots.zip(https://git.kayg.org/attachments/4a168ad1-dec7-4ac5-99ed-e001e410233f). They are also in the worktree atartifacts/mail-m2/mail-*.png.Visual issues I saw in the screenshots (not fixed; for the orchestrator's review)
../../../../etc/passwdrow's meta line and Save button are almost unreadable (1440 dark).fullPage, so the fixed app background stops at the first viewport and the area below is flat black or grey. This is a capture artifact, not what a User sees while scrolling.Gate output (verbatim)
cargo fmt --check: exit 0, no output.cargo clippy -p <crate> --all-targets -- -D warnings:cargo test -p <crate>:bun run check(apps/web):bun run test(apps/web):bash packages/api-client/check-generated.sh: exit 0 (git diff --exit-codeclean).python3 scripts/parity_matrix.py --check:Adversarial probe:
The web gates ran after the merge and before this session's changes. Those changes touch only Rust and test-probe files, so the web results still apply. Mail migrations 0003–0008 do not collide with
origin/dev, which has only 0001–0002.cargo cleanremoved 9.3 GiB. The web build output was deleted.Remaining / known gaps
sccacheserver ran at about 10 crates per minute with low host load.RUSTC_WRAPPER=built the server in 2 minutes.mail-m2 polish round: done
Head:
d4bbdd6fb128c9108fc932f0a7c561f9048478a3onjob/mail-m2. The worktree is clean. No push, no merge.Commits:
875893d8e(API:unread_countper folder),ebd216dd9(UI polish),d4bbdd6fb(parity exceptions for the new UI-only actions).What changed, point by point
L.timeLabel, with the full date as the hover title).usePageChromeinto the one mode header. They are icon buttons with warm tooltips and shortcuts: Jump to oldest unread (U), Attachments (A, popover) and Copy link (L), next to the existing ⋯. The ⋯ menu gains Mark as read/unread. The three shortcuts are new registry entries in a newmailgroup and scope, and they are ignored in text fields.apps/web/src/lib/mail/frame.ts):allow-same-originonly and NEVERallow-scripts. The frame CSP still blocks scripts and all network access; images load only after consent.:where()zero specificity. The self-hosted font faces are copied underfont-src 'self'.color-schemematches the app, so the frame stays transparent in dark mode. There is no serif and no white box.FileNamemiddle truncation on one line and never wrap into the actions. The glyph is centred on the name line (lhunit). The second row no longer fades: the cause was the white frame showing through the glass.MailFolderView.unread_count: one indexed membership scan with a substring test on the stored flags, and a store test covers it.mail-m2-polish-screenshots.zip(https://git.kayg.org/attachments/26e5fb41-23f6-4f21-acec-0afde298ce7a)/home/kayg/Developer/calternal-wt/mail-m2/artifacts/mail-m2/mail-{inbox,thread,html-consent,attachments,search,new-message,oldest-unread}-{390,820,1440}-{light,dark}.pngThe new-message and blocked-images notices are now compact cards with an icon, the text, one action and a hide control. On a narrow card the action moves under the text (container query).
Decisions (not covered by DESIGN)
NoticeBannerfor the Mail notices, because its--nowwarning tint reads as an error. The Mail notices are plain cards.L/U/Ain themailscope.Lmatches the block Copy link key.Gate output (verbatim)
bun run check:bun run test:bash packages/api-client/check-generated.sh: exit 0.python3 scripts/parity_matrix.py --check:Mail adversarial probe (real server, merged tree, UI changes included):
Not re-run this round, because the crates are unchanged since round 3 (gates in the previous comment):
calternal-fs,calternal-cli.Merged into dev at
1a72e9564and pushed. Deploy status is on #203.Owner decision (2026-10-01): confirmed again. Reuse Apple Mail and especially Gmail keyboard conventions; the shortcut presets (#542) check every Mail letter against them.