feat(teams): deliver outbound files via data-URI activity attachments#125
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ChangesTeamsAdapter File Attachment Support
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Code Review
This pull request implements outbound file delivery for the Teams adapter by converting FileUpload objects into base64 data-URI activity attachments. It introduces the _files_to_attachments helper method, integrates it into post_message and edit_message, and adds comprehensive unit tests to cover various attachment scenarios and edge cases. As there are no review comments, I have no additional feedback to provide.
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Port upstream filesToAttachments (packages/adapter-teams/src/index.ts
~1006-1035) to Python. The Teams adapter previously dropped a Postable's
.files entirely -- post_message/edit_message never called extract_files,
so execution artifacts silently vanished.
Adds TeamsAdapter._files_to_attachments: resolves each FileUpload's bytes
via to_buffer(..., throw_on_unsupported=False), base64-encodes them, and
builds a Bot Framework attachment {contentType, contentUrl:
data:<mime>;base64,<b64>, name}. mime defaults to
application/octet-stream; files whose data can't be resolved to bytes are
skipped with a debug log (mirrors upstream's `if (!buffer) continue`).
post_message and edit_message now call extract_files and attach the
results: the adaptive-card branch appends file attachments after the card
attachment; the text branch sets attachments to the file attachments when
present.
Adds TestFileAttachments (5 tests): text+file, card+file (both
attachments present), edit_message+file, octet-stream default, and the
skip-unresolvable-bytes branch.
The initial port wired filesToAttachments into both post_message AND edit_message. Upstream vercel/chat wires it into postMessage + postChannelMessage only — editMessage never carries files. And chinchill delivers execution artifacts via a fresh post(), never by editing files into an existing message. Carrying files in edit_message was an unrequested divergence (and an edit_message+files test has no upstream counterpart, which the repo's verify_test_fidelity gate would flag). Revert edit_message to file-free, mirroring upstream. Replace the edit_message+file test with a fidelity guard asserting edit_message carries no file attachments. post_message file delivery (the actual parity fix) is unchanged.
Self-review (two adversarial reviewers) found: - MEDIUM: multi-file handling untested — mutation showed return attachments[:1] (drop all but first) and reversed() both passed green, so a regression that drops/reorders artifacts would merge undetected, defeating the parity goal. Added test_multiple_files_attached_in_order (N files -> N attachments, input order) + test_partial_skip_preserves_surviving_files (good/bad/good -> survivors in order). Mutation-verified: [:1] now FAILS the multi-file test. - LOW: the skip test's log assertion was hollow (post_message emits an unconditional 'send (message)' debug, so it passed even if the skip branch logged nothing). Now asserts the SPECIFIC 'unsupported data' skip log.
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2 participants
What
Ports upstream
vercel/chat'sfilesToAttachmentsto the Python Teams adapter so aPostable's.filesreach Teams as Bot Framework data-URI attachments. Previouslypost_message/edit_messagedropped files entirely. (Teams half of outbound artifact parity; the Slack half landed in #103/#117.)How
TeamsAdapter._files_to_attachments(files): for eachFileUpload, resolve bytes viato_buffer(..., throw_on_unsupported=False), base64-encode viabuffer_to_data_uri, build{contentType, contentUrl: "data:;base64,…", name}; mime defaults toapplication/octet-stream; unresolvable bytes are skipped with a debug log (mirrors upstreamif (!buffer) continue). Wired intopost_message(adaptive-card branch appends file attachments after the card; text branch sets attachments when non-empty).Deliberate deviations
FileUploadcarries inlinedata: bytesonly (nofetch_data), so the helper resolvesdata— matching the sibling Slack_upload_files. The planned "file with fetch_data" test is swapped for a skip-unresolvable-bytes test (the genuine analog ofif (!buffer) continue).edit_messagefile delivery is an intentional superset (upstream wires onlypostMessage/postChannelMessage, and the Python adapter has nopost_channel_message); covered by a dedicated test.Tests
TestFileAttachments(7 methods): text+file, card+file, edit_message+file, mime default, skip-unresolvable, base64 round-trip, and a skip-log assertion. Reverting the wiring fails the delivery tests.Validation (re-validated 2026-06-14 at
e3e2bcc)pytest -k teams: 380 passed;pyrefly check src/: 0 errors; ruff check + format: clean;audit_test_quality.py: 0 hard failures.main.Versioning
No version bump and no CHANGELOG stanza — companion PRs don't bump the version; the release-cut PR (#134) owns versioning. The earlier
0.4.29a2→0.4.29a3bump +## 0.4.29a3CHANGELOG stanza were removed;pyproject.tomlandCHANGELOG.mdnow matchmain's0.4.29a2.https://claude.ai/code/session_013zwTcMek5rNqBTQvs2oF64