Translate Slack attachment failures into actionable user-facing notices
instead of generic download errors. When a scope/auth/permission issue
breaks attachment processing, the user sees:
[Slack attachment notice]
- Slack attachment access failed for photo.jpg. Missing scope:
files:read. Update the Slack app scopes/settings and reinstall
the app to the workspace.
Two helpers do the translation:
_describe_slack_api_error — handles SlackApiError responses
(missing_scope, invalid_auth, file_not_found, access_denied, etc.)
_describe_slack_download_failure — handles httpx.HTTPStatusError
(401/403/404) and Slack-returns-HTML-sign-in fallbacks
Wired into three existing call sites:
- the Slack Connect files.info path (PR #11111) so scope errors
surface instead of being logged as generic "files.info failed"
- the image, audio, and document download paths so 401/403 and
HTML-body responses translate into actionable notices
Adjustment from original PR: dropped _probe_slack_file_access_issue,
the proactive pre-download files.info probe. It added one extra
Slack API call per attachment even on healthy ones, and overlapped
with the existing files.info call from PR #11111. The post-failure
translation path covers the same user-facing diagnostic value
without the per-message tax.
Also documents files:read scope more prominently in the Slack setup
guide and troubleshooting table.
Contributed back from https://github.com/xinbenlv/zn-hermes-agent.
Closes#7015.
Co-authored-by: xinbenlv <zzn+pa@zzn.im>
778fd1898e