Private API: favorite-tags routes - #93
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Four passthroughs for followed hashtags, mirroring the favorites ones: list, check, add and delete. The username comes from the validated code only. The tag is a body string, so the check and delete paths go through FavoriteTagPath, which escapes both segments and rejects dot segments, the same way NotificationsPath does. Parity harness: bodies and known-divergence entries for the additive routes.
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PR Summary by QodoAdd private API routes for followed hashtags
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| return $"{action}/{Uri.EscapeDataString(username)}/{Uri.EscapeDataString(tag)}"; |
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When an authenticated client supplies a valid JSON string containing a lone surrogate such as "\ud800", TemplateField deliberately materializes that UTF-16 value, but Uri.EscapeDataString(tag) throws UriFormatException. The check and delete handlers therefore fall through to the global 500 response instead of reaching their intended invalid-tag 400 branch. Validate Unicode scalar sequences or catch the escaping exception and return null from this helper.
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Checked on the runtime this service targets (net10.0): Uri.EscapeDataString("\ud800") does not throw. It encodes the lone surrogate as U+FFFD, giving %EF%BF%BD, and "a\udc00b" gives a%EF%BF%BDb. So the check and delete handlers stay on their own path and never reach the 500 page on this input. NotificationsPath and PostTipsPath rely on the same behaviour.
Pinned it as LoneSurrogateIsEncodedNotThrown in FavoriteTagsPathTests, so a runtime change would show up in CI rather than in production.
On the runtime this service targets, Uri.EscapeDataString encodes a lone surrogate as U+FFFD rather than throwing, so the check and delete handlers never fall through to the 500 page on such input. Record that as a test.
📝 WalkthroughWalkthroughThe change adds four private favorite-tags routes, escaped upstream path construction, dot-segment validation, focused path tests, and parity-driver cases for known reference-build divergences. ChangesFavorite-tags private API
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🔵 Low · up to The new favorite-tag routes use the configured private service and may forward authentication headers across automatic redirects, which could expose credentials if that service redirects to an unintended host. The PR is mergeable with explicit owner awareness and follow-up to require HTTPS and restrict redirects. Sequence Diagram(s)sequenceDiagram
participant Client
participant Routes
participant PrivateApi
participant Upstream
Client->>Routes: POST /private-api/favorite-tags-check
Routes->>PrivateApi: Invoke FavoriteTagsCheck
PrivateApi->>PrivateApi: Validate code and escape path values
PrivateApi->>Upstream: GET isfavoritetag/{username}/{tag}
Upstream-->>PrivateApi: Return response
PrivateApi-->>Client: Forward response
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Full details: Linked Issues checkExplanation The changes implement the four routes in issue
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In `@dotnet/EcencyApi/Handlers/PrivateApi.UserData2.cs`:
- Line 164: Update the private API request flow around UserData2Js.Query to
validate PRIVATE_API_ADDR as an HTTPS URI and prevent automatic redirects from
forwarding PRIVATE_API_AUTH credentials; disable redirects or allow only
same-origin HTTPS redirects without credentials.
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📒 Files selected for processing (4)
dotnet/EcencyApi.Tests/FavoriteTagsPathTests.csdotnet/EcencyApi/Handlers/PrivateApi.UserData2.csdotnet/EcencyApi/Handlers/Routes.csdotnet/parity/driver.py
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TemplateField turns a missing tag into the literal "undefined", and null, booleans and numbers into their JS string forms. Upstream, those are all valid tag names, so a delete with no tag would remove a follow the caller never named. FavoriteTagField now yields the tag only when it is a non-empty JSON string; check, delete and add answer 400 otherwise.
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Four private-api routes for followed hashtags, mirroring the favorites passthroughs. The onboard side is ecency/onboard#20.
/private-api/favorite-tagsfavorite-tags/{username}, query string passed through/private-api/favorite-tags-checkisfavoritetag/{username}/{tag}/private-api/favorite-tags-addfavorite-tagwith{username, tag}/private-api/favorite-tags-deletefavoriteTag/{username}/{tag}ValidateCodeonly, never from the body.tagmust be a present, non-empty JSON string (FavoriteTagField), else 400. The favorites handlers template a missingaccountinto the literalundefined; a tag cannot go that way, sinceundefined,null,trueand123are all valid tag names upstream and a delete with no tag would remove a follow the caller never named.FavoriteTagPathbuilds the check and delete paths: both segments escaped, dot segments rejected with a 400, same reasoning asNotificationsPath. A leading#is escaped rather than dropped, since the upstream normalises the tag and strips one itself. A lone surrogate is encoded as U+FFFD by the runtime rather than thrown on, and that is pinned by a test.Tests:
FavoriteTagsPathTests(unchanged real requests,#escaping, structural characters contained to their segment, dot segments rejected, lone surrogate encoding, absent or non-string tag rejected). Full suite green, 235 tests.Closes #92