feat(scrobbling): somewhere to link a token, and to answer for a listen by InstaZDLL · Pull Request #193 · InstaZDLL/waveflow-server

InstaZDLL · 2026-09-13T22:10:56Z

Summary

The third slice of RFC-010: somebody outside the host can finally link a token.

#191 built the durable half and #192 made the outbound call, but both were reachable only from a shell on the server. Decision 9 draws the line this PR implements: a destination's base URL belongs to the deployment and lives in src/config.rs; an authorisation belongs to a person, so it is posed by a route — and by a command, for an operator preparing a server nobody has opened a browser on.

The surface

Six operations on five paths, all self-scoped. (Five .route(...) entries: PUT and DELETE share the one that names a destination.)


`GET /api/v2/scrobble-links`	what each link is doing
`PUT /api/v2/scrobble-links/{provider}`	pose an authorisation, replacing any it had there
`DELETE /api/v2/scrobble-links/{provider}`	withdraw it
`GET /api/v2/scrobble-queue/uncertain`	the listens nobody knows the fate of
`DELETE /api/v2/scrobble-queue/uncertain/{entry_id}`	prefer the gap
`POST /api/v2/scrobble-queue/uncertain/{entry_id}/retry`	accept a possible duplicate

Access::Write, not Access::Admin. Access::Admin's own doc lists "credentials", which is nearly a trap: a dedicated Subsonic password is set by an administrator for somebody else, while a scrobbling link is the account's own — closer to a bookmark or a share. The CLI is the opposite case and stays administrative, acting on a --username the way create_token does.

scrobble-queue rather than scrobble-links/uncertain. Under scrobble-links/, the word uncertain would sit in the same position as {provider} and the two would be one segment read two ways. Separated rather than left to whichever way the matcher resolves it.

A gap the RFC did not name

Decision 13 makes uncertain terminal and asks a person to choose the fate of a listen nobody knows was recorded. discard_uncertain_scrobble and retry_uncertain_scrobble both name an entry by its public_id — and nothing published one. Two gestures granted, with no way to learn what to aim them at: a choice offered with nothing to choose between.

uncertain_scrobbles closes it, and what it publishes is deliberately thin: the public id, the destination, played_at, the attempts, a normalised cause. Never the title or the artists. Decision 12 is titled "des compteurs, jamais un écho" and spells it out: "Jamais le contenu de l'enveloppe, jamais la réponse brute du fournisseur."

The same decision adds that this must not travel through synchronisation — it is the server's operational state, not user data to replicate to the desktop. None of these routes take a MutationContext, so none of them write to the sync journal. That fell out of the service signatures rather than from reading the decision, which is luck rather than care; it is checked here because the PR now claims it.

That leaves a real tension, resolved rather than ignored: a person cannot decide about a bare UUID. played_at is the answer — it is the moment of their own gesture, already readable through /api/v2/history, so a client matches the entry against a listen it already holds instead of this server republishing one.

Its exclusions are the counter's, on purpose. An entry already retried has stopped asking, so scrobble_links stops counting it; an unlinked generation drops out because retry_uncertain_scrobble refuses one anyway — there is no live authorisation left to answer under. A list built on a different predicate would offer a decision the count standing beside it says is already made. The test asserts both together, before and after a retry, because either one alone passes while they disagree.

The command line

waveflow-server scrobble link | unlink | status, admin-actor on a --username.

The token comes from an environment variable and never from argv: a shell history and a process list are both readable by people this credential is not for. --token-env names the variable rather than fixing it, so an operator linking one account after another can keep each token in a variable of its own rather than overwriting one — and so a test can name its own, which matters because cargo test runs these as threads in one process. It permits that; it does not enforce it, and the default is there for the single-link case.

Every command goes through DomainServices. That is the reasoning create_token already carries in a comment: a link made here must carry the same validation, the same sealing and the same generation semantics as one made over HTTP, which two copies of the insert would not guarantee.

The destination is read by FromStr on both surfaces — no derived Deserialize, no clap ValueEnum. The wire name, the database CHECK, as_str and FromStr are one fact held together by a unit test whose own comment says it was written because the serialising surface did not exist yet. This PR is that surface; a fifth spelling is exactly the drift it exists to stop.

Verification

Seventy unit tests, and the integration targets this touches at 35 (scrobbling), 14 (native_api) and 5 (service). cargo fmt --all --check, cargo clippy --all-targets --all-features -- -D warnings and all eighteen targets are green.

Thirteen inversions, each removed on its own, its test watched falling, then restored and the restored tree re-run green.

Removed	Test that fell
the exclusion shared with the `uncertain` counter	`an_ambiguous_entry_can_be_found_before_it_is_answered`
the tenancy join on the listing	`one_account_never_sees_another_account_s_ambiguous_entries`
the unlinked-generation filter	`an_unlinked_generation_stops_asking_for_a_decision`
the `422` on a destination the server cannot name	`an_account_poses_and_withdraws_its_own_scrobble_link`
the uncertain routes being registered at all	`an_uncertain_entry_is_listed_and_answered_over_http`
the same refusal on the command line	`the_cli_refuses_an_unknown_destination_and_a_non_administrator`
the administrator check those commands stand on	`the_cli_refuses_an_unknown_destination_and_a_non_administrator`
the `active`-link requirement on a deliberate retry	`an_entry_under_a_broken_link_can_be_discarded_but_not_retried`
tenancy on discarding an ambiguous entry	`an_uncertain_entry_is_listed_and_answered_over_http`
tenancy on retrying one	`an_uncertain_entry_is_listed_and_answered_over_http`
the redaction in `LinkScrobbleRequest`'s `Debug`	`a_link_request_does_not_print_its_secret`
the `scrobbling` tag that keeps the mutation protocol out	`the_scrobbling_routes_advertise_no_operation_id_protocol`
both exclusions on discarding an entry	`an_ambiguous_entry_can_be_found_before_it_is_answered` and `an_unlinked_generation_stops_asking_for_a_decision`

The route-registration one is the one worth reading. A handler can be written, correct, and reached by nothing — which is precisely what happened one level down in #192, where asked_wait existed while submit still called reset_in and only a dead-code warning noticed. Pointing the uncertain routes at an unregistered path answers 404 while every handler stays perfectly good.

The command-line inversion earned its keep too. With the provider falling back silently, the test's own output reads cli-refusing-user had no link to listenbrainz — spotify had become ListenBrainz and the unlink succeeded. That is the shape of the harm, printed by the failure itself.

The two tenancy inversions earned their keep, and say why the review mattered. Neutering the tenancy on discard answers 204 where 404 is owed; on retry, 200. Both would have left the previous version of that test green, because it sent an id belonging to nobody — see the review section below.

A claim this PR made and had to withdraw. An earlier revision said the whitespace guard on read_secret_env could not be tested, because exercising it needed a variable to be set and setting one is the std::env::set_var removed here as a data race. That was wrong, and a review showed it by pointing at this PR's own work: the predicate was welded to the lookup. Split apart as non_blank(name, value), it takes no environment at all and now has two tests — one for every spelling of blank, one proving a padded token is returned untrimmed, because the same path reads account and Subsonic passwords and trimming those would alter credentials that already work.

"Untestable" almost always means "not yet separated from the thing that made it awkward". Left here as the correction rather than quietly deleted.

And two more left alone deliberately, named rather than numbered around. The 401 exercises authenticated(), which is covered elsewhere — inverting it would measure somebody else's code. And route-level self-scoping has no second id in scope to substitute: the defect is unrepresentable at that line, so the second account in that test is cheap insurance rather than a falsifiable guard.

One inversion is composed rather than direct. require_admin is called from three commands, so its body was neutered rather than the call site in scrobble_status. The suite being green today is what says the call exists there; the inversion is what says the body is load-bearing. Neither half proves it alone.

Three rounds of review, and what each one found

The first returned six findings, all taken. The second returned five, one of which was that my answer to the first had made something worse — and four smaller ones, three taken and one declined below.

The one worth leading with is mine. an_uncertain_entry_is_listed_and_answered_over_http claimed to show that a stranger's id answers 404 rather than acting — and sent a fresh Uuid::new_v4(), an id belonging to nobody at all. A handler that had dropped the tenancy binding entirely would have answered 404 to that and passed. The test whose sibling comment boasts about catching "what a route can get wrong that a service method cannot: whose id it passes" could not catch it. It now creates a second account, logs it in, and presents the owner's real entry under the stranger's bearer; the two tenancy inversions above are what that bought.

The list offered a decision retry would always refuse. retry_uncertain_scrobble requires status='active', while the listing filtered status <> 'unlinked' — so a broken link's ambiguous entries were listed for ever and retried never. The docstring claimed the two agreed: true of unlinked, false of broken. The asymmetry itself is right, because discarding stays meaningful under a refused token while resubmitting does not, so the prose is corrected and a test now holds it. Its own first draft scrobbled the untagged track, queued nothing, and asserted a break that had never happened — it now asserts the destination was actually asked, so it cannot pass without exercising the path it names.

Removing the 409 on retry made the document worse, and only the tag fixed it. The service excludes anything already retried with NOT EXISTS, so a spent entry stops being findable and answers 404 — its comment says the clause exists for exactly that. But deleting the hand-written (status = 409, body = ErrorResponse) did not delete the 409: annotate_mutation_headers injects one into every user-data write, and my declaration had merely been winning an or_insert_with race. Vacating the entry let the injected one land — with no response schema and a description about operation-id conflicts that is false for this route. It also pushes x-waveflow-operation-id and x-waveflow-device-id onto handlers that never read them.

The real fix is a tag. user-data in this codebase means "a mutation that carries the operation-id protocol", and decision 12 says this state never travels through synchronisation at all — so these six operations are scrobbling, which is true rather than evasive. annotate_scope_refusals keys on security rather than on the tag, so the injected 403 and its sweep test are untouched. the_scrobbling_routes_advertise_no_operation_id_protocol is what says the tag still means that, and putting user-data back makes it fail with "advertises a conflict it cannot produce".

std::env::set_var was a data race, not a style note. A unique variable name solves collision, not the race: these tests are threads in one process and tempfile::tempdir() reads TMPDIR on every sibling. link is now exercised where no environment is needed — an absent variable, which is the default state — plus a parse-only assertion pinning the flag names and the default.

The doc comments were being published as the API. utoipa maps a handler's /// into the operation's summary and description, so every generated client was shipping commit archaeology: how a 409 came to be declared, what db_error maps sqlx failures to, why scrobble-queue sits where it does. None of that is what a caller needs. The reasoning moved to // — where it is still worth having, just not in somebody's SDK — and the /// now says the behaviour: a second attempt and somebody else's entry both answer 404.

A whitespace-only token gave a mute error, and LinkScrobbleRequest derived Debug while holding a plaintext secret. Both fixed, and both now have tests — though the first only after a second review showed that my reason for leaving it untested was wrong. See the Verification section for that correction.

Declined, and said rather than skipped. set_credential checks password.len() < 12 on the untrimmed value, so " abcdefghij " clears the twelve-character rule with ten real ones — and the new blank check now disagrees with it about what counts as content. Fixing that changes which passwords a server accepts, which is a decision about credentials rather than about scrobbling, so it belongs to its own change. Noted here so it is not discovered as an oversight.

A note for anyone reading a security scan of this branch: that inversion puts .field("secret", &self.secret) on disk for the length of one cargo test, and an automated review caught it mid-run. It is restored — hash-verified — before the next command, and the fix it suggested is character-for-character what the file already contains.

And a third round

The commit that fixed a stolen doc comment stole another one. Round two found that a new test in tests/scrobbling.rs had been inserted between an existing doc block and the function it documented, leaving that function undocumented and the new one wearing prose about a different subject. The commit that moved it back inserted the new OpenAPI test into src/lib.rs the same way, so every_public_operation_is_found_and_cleared lost its doc block to the_scrobbling_routes_advertise_no_operation_id_protocol. The same mistake, one file over, in the act of repairing it. Moved back.

A whole class of published reasoning I had missed. Round two established that utoipa maps a handler's /// into the operation description. It also maps a ToSchema type's /// into the schema description — so UncertainScrobble was shipping "Decision 12 keeps the envelope out of the API… decision 13 asks a person to choose" into every generated client, and its id field was shipping the argument about sequential rowids. Two handlers were still doing it too: PUT explained that "decision 4 makes the row the generation", and DELETE's summary — the line an SDK puts beside the method name — began "The first of the two gestures decision 13 grants". All moved to //. "Decision 12" has no referent outside docs/rfcs/.

Another .is_err() that could not fail for its reason, in the tenancy test, sixty lines above the one the previous round had just sharpened for exactly that. It names ServiceError::NotFound now.

discard_uncertain_scrobble carried none of the listing's exclusions. The list, the counter and retry all skip an entry that has been retried or whose generation was withdrawn; discard did not. So a client holding an id could flip a retried original to discarded — a gesture nothing offered any more, contradicting retry's own promise that the original "stays uncertain for good". Pre-existing, and reachable only because this branch publishes the ids. Aligned, and both halves asserted.

One assertion the CLI tests were missing. link checks the admin, resolves the account, parses the provider, then reads the secret — and the absent-variable case asserts only about the last, so hoisting read_secret_env to the top would have left every CLI test green. A non-administrator with an absent variable must now fail on the administrator message, and must not mention the variable.

And the tag needed declaring. scrobbling was not in the tags(...) list, so it shipped with no description — the one thing moving out of user-data actually cost. Declared.

Declined: an unparseable stored public_id maps to ServiceError::Invalid and so answers 422, blaming the caller for a row this server wrote. The path is unreachable, list_scrobble_links has the same shape on main, and changing an error mapping for a case that cannot happen is churn.

Also here

.env.example gains WAVEFLOW_SCROBBLE_TOKEN, beside the two passwords already documented there for the same reason.

RFC-010's header no longer says the native routes and the CLI "restent dehors", because they no longer do.

Still out of scope, on purpose

Maloja and Last.fm, in that order, by decision 11. The vocabulary and the CHECK constraint already name them; only the adapters are missing.
Queue retention, recorded in the RFC by feat(scrobbling): give a listen a queue it can leave the server by #191 and unchanged here: a terminal row is kept forever, so the table grows by one row per listen per destination. It needs no migration, so it costs the same later as now.
A web client surface. These are routes, not screens.

https://claude.ai/code/session_01HreLtK4rFopmncpZEHzp59

Summary by CodeRabbit

Nouvelles fonctionnalités
- Ajout de la gestion des autorisations de scrobbling par destination via l’API et la CLI.
- Consultation, suppression et nouvelle tentative des écoutes nécessitant une décision.
- Affichage de l’état des files d’attente et des échecs de scrobbling.
- Prise en charge de plusieurs comptes via une variable d’environnement configurable.
Documentation
- Documentation enrichie des commandes, variables d’environnement et routes de scrobbling.
Tests
- Ajout de tests couvrant les autorisations, permissions, destinations invalides et écoutes ambiguës.

…wer for a listen RFC-010's third slice. #191 built the durable half and #192 made the outbound call; both were reachable only from a shell on the host, so nobody outside could link anything. Decision 9 says a destination's base URL belongs to the deployment while an *authorisation* belongs to a person — which means a route, and a command for an operator preparing a server nobody has opened a browser on. Six routes, all self-scoped: list the links, put and delete one by destination, list the ambiguous entries, discard one, retry one. A dedicated Subsonic password is set by an administrator *for* somebody; a scrobbling link is the account's own, like a bookmark, so `Access::Write` rather than `Access::Admin`. **A gap the RFC did not name.** Decision 13 makes `uncertain` terminal and asks a person to choose the fate of a listen nobody knows was recorded — and `discard_uncertain_scrobble` and `retry_uncertain_scrobble` both name an entry by its `public_id`, which nothing published. Two gestures granted, and no way to learn what to aim them at. `uncertain_scrobbles` closes it. What it publishes is deliberately thin: the public id, the destination, `played_at`, the attempts, a normalised cause. Never the title or the artists — decision 12 keeps the envelope out of the API. `played_at` is what makes an entry recognisable without republishing it: the moment of the person's own gesture, already readable through `/api/v2/history`, so a client matches against a listen it already holds. Its exclusions are the counter's, on purpose. An entry already retried has stopped asking, so `scrobble_links` stops counting it; an unlinked generation drops out because `retry_uncertain_scrobble` refuses one anyway. A list built on a different predicate would offer a decision the count beside it says is already made. The command line takes the token from an environment variable, never argv: a shell history and a process list are both readable by people this credential is not for. `--token-env` names the variable, so linking one account after another in the same shell does not reuse a stale value. Every command goes through `DomainServices` — the reasoning `create_token` already carries, since a link made here must carry the same validation, sealing and generation semantics as one made over HTTP. The destination is parsed by `FromStr` in both surfaces rather than by deriving `Deserialize` or a clap `ValueEnum`. The wire name, the database `CHECK`, `as_str` and `FromStr` are one fact held together by a unit test, and a fifth spelling is the drift it exists to stop. Seven inversions, each restored and the tree re-verified green: dropping the shared exclusion, the tenancy join or the unlinked filter each fails exactly one of the three service tests; making the provider fall back silently answers 204 where the route owes 422; pointing the uncertain routes at an unregistered path answers 404; and on the command line the same fallback makes `spotify` unlink ListenBrainz, while a neutered administrator check lets an ordinary account read another's queue. Not inverted, and said rather than numbered around: the 401 exercises `authenticated()`, which is covered elsewhere, and route-level self-scoping has no second id in scope to substitute — the defect is unrepresentable at that line, so the second account there is insurance rather than a falsifiable guard. Claude-Session: https://claude.ai/code/session_019coGCzcX775GmG9kYz8fft Signed-off-by: InstaZDLL <github.105mh@8shield.net>

…a stranger Six findings, all taken. **A test of mine could not fail for the reason it named**, which is the one worth leading with. `an_uncertain_entry_is_listed_and_answered_over_http` claimed to show that "a stranger's id is a 404, not a decision" and sent a fresh `Uuid::new_v4()` — an id belonging to nobody at all. A handler that had dropped the tenancy binding entirely would still have answered 404 and passed. It now creates a second account, logs it in, and presents the owner's real entry under the stranger's bearer. Two new inversions prove the difference: neutering the tenancy on discard answers 204 where 404 is owed, and on retry 200 — and both would have left the old test green. **The list offered a decision retry would always refuse.** `retry` requires `status='active'`; the list filtered `status <> 'unlinked'`, so a `broken` link's ambiguous entries were listed for ever and retried never. The docstring asserted the two agreed, which was true of `unlinked` and false of `broken`. The asymmetry is right — discarding stays meaningful under a broken token, resubmitting does not — so the prose is corrected and `an_entry_under_a_broken_link_can_be_discarded_but_not_retried` holds it still. Its first draft scrobbled the untagged track, queued nothing and asserted a break that had not happened; it now asserts the destination was actually asked. **The `409` documented on retry cannot happen.** The service resolves the entry with a `NOT EXISTS` that already excludes anything retried, so a spent entry stops being findable and answers 404 — its own comment says the clause exists for exactly that. The annotation published a branch no client will ever see and none for the one it gets. **`std::env::set_var` in the CLI test is a data race, not a style note.** The unique variable name solved collision, not the race: `cargo test` runs these as threads in one process and `tempfile::tempdir()` reads `TMPDIR` on every sibling. `link` is now exercised where no environment is needed — a variable that is *absent*, which is the process's default state — plus a parse-only assertion pinning the flag names and the `--token-env` default. **A whitespace-only token gave a mute error.** `read_secret_env` now judges the trimmed value and returns the original: trimming what it hands back would silently alter account and Subsonic passwords that already work. This guard has no test, and that is not an oversight to be discovered later — exercising it would need the `set_var` removed above. **`LinkScrobbleRequest` derived `Debug` while holding a plaintext secret.** Latent rather than live, and now structural: a hand-written `Debug` prints `[redacted]`. Its test deliberately interpolates neither the secret nor the formatted output into the failure message, because if the guard were gone that output would be the token and a panic message is a log line — which is the CodeQL alert the previous slice earned. Claude-Session: https://claude.ai/code/session_019coGCzcX775GmG9kYz8fft Signed-off-by: InstaZDLL <github.105mh@8shield.net>

A second review, and the sharpest finding is that my previous fix made things worse. Removing the hand-written `409` from the retry route did not remove the `409`. `annotate_mutation_headers` injects one into every `user-data` write, and the declaration had merely been winning an `or_insert_with` race. Vacating the entry let the injected one land — with no response schema, and a description about operation-id conflicts that is false for a route which never calls `mutation_context`. The same pass pushes `x-waveflow-operation-id` and `x-waveflow-device-id` onto handlers that never read them. The fix is a tag rather than an annotation. `user-data` means "a mutation carrying the operation-id protocol"; RFC-010 decision 12 says this state never travels through synchronisation at all, so these six operations are `scrobbling`. `annotate_scope_refusals` keys on security rather than on the tag, so the injected `403` and its sweep test are untouched. `the_scrobbling_routes_advertise_no_operation_id_protocol` holds it, and putting `user-data` back makes it fail on the first route it reaches. **The doc comments were being published.** utoipa maps a handler's `///` into the operation's summary and description, so every generated client was shipping commit archaeology — how a `409` came to be declared, what `db_error` maps sqlx failures to. That reasoning moved to `//`; the `///` now says what a caller needs, which is that a second attempt and somebody else's entry both answer 404. **A test carried the wrong prose.** The new broken-link test was inserted between an existing doc block and the function it documented, so it wore three paragraphs about unlinking while `an_unlinked_generation_stops_asking_for_a_decision` was left with none. Moved back. **And a claim I made in this PR was wrong.** I said the whitespace guard on `read_secret_env` could not be tested without the `set_var` removed as a data race. The review showed otherwise by pointing at this PR's own work: the predicate was welded to the lookup. Split out as `non_blank`, it needs no environment and has two tests — every spelling of blank refused with the variable named, and a padded token returned intact, because the same path reads account and Subsonic passwords. `the_cli_links_and_unlinks_a_scrobble_destination` was renamed: it stopped linking through the CLI when `set_var` went, so the name had become a lie. It now says what it covers, and its doc says what it does not — the two lines after the secret is read, which a subprocess against `CARGO_BIN_EXE_waveflow-server` would reach. Claude-Session: https://claude.ai/code/session_01HreLtK4rFopmncpZEHzp59 Signed-off-by: InstaZDLL <github.105mh@8shield.net>

…the SDK The smaller half of the second review, and one thing it found that reached further than the route it was reported on. `list_uncertain_scrobbles` still carried its routing argument in a `///` block — why `scrobble-queue` sits apart from `{provider}` — and utoipa publishes those verbatim as an operation's description. The retry handler was corrected for this in the previous commit; this is the same defect one function over. The reasoning is still worth having, just not in somebody's generated SDK, so it is a `//` now. The broken-link test asserted `.is_err()`, which cannot tell "the link is broken, so this entry is not findable for retry" from any other fault. It names `ServiceError::NotFound` now, and the existing inversion on `status='active'` still falls it — through `unwrap_err` rather than through the assertion, but for the same reason. `Cli::parse_from` calls `std::process::exit` on a parse error, which would have killed the test binary instead of failing the test — in the one assertion whose whole purpose is to notice a renamed flag. Both call sites use `try_parse_from`. Declined, and recorded in the PR: `set_credential` checks `len() < 12` on the untrimmed password, so twelve spaces around ten characters pass. The new blank check disagrees with it about what counts as content, but fixing that changes which passwords a server accepts — a decision about credentials, not about scrobbling. Claude-Session: https://claude.ai/code/session_01HreLtK4rFopmncpZEHzp59 Signed-off-by: InstaZDLL <github.105mh@8shield.net>

…card A third review. Six things, and the first is the worst kind. **The commit that fixed a stolen doc comment stole another one.** Round two found a new test inserted between an existing doc block and the function it documented; the commit that moved it back did exactly that to `src/lib.rs`, leaving `every_public_operation_is_found_and_cleared` undocumented and the new OpenAPI test wearing three paragraphs about `PUBLIC_OPERATIONS`. Moved back. **A whole class of published reasoning was still leaking.** Round two established that utoipa maps a handler's `///` into the operation description; it also maps a `ToSchema` type's `///` into the schema description. So `UncertainScrobble` shipped "Decision 12 keeps the envelope out of the API… decision 13 asks a person to choose" to every generated client, and its `id` field shipped the argument about sequential rowids. Two handlers were still doing it as well — `PUT` explaining that "decision 4 makes the row the generation", and `DELETE`'s summary, the line an SDK puts beside the method name, opening with "the two gestures decision 13 grants". All moved to `//`; "decision 12" names nothing a caller can look up. **`discard_uncertain_scrobble` carried none of the listing's exclusions.** The list, the counter and retry all skip an entry that has been retried or whose generation was withdrawn. Discard did not, so a client holding an id could flip a retried original to `discarded` — contradicting retry's own promise that the original "stays `uncertain` for good". Pre-existing, and reachable only because this branch publishes the ids. Both halves are asserted now, and inverting them fails both tests. **Another `.is_err()` that could not fail for its reason**, in the tenancy test, sixty lines above the one the previous round sharpened for exactly that reason. It names `ServiceError::NotFound`. **The CLI tests could not notice a reordering.** `link` checks the admin, resolves the account, parses the provider, then reads the secret — and the absent-variable case asserted only about the last, so hoisting `read_secret_env` to the top would have left every CLI test green. A non-administrator with an absent variable now has to fail on the administrator message, and must not mention the variable. **And `scrobbling` needed declaring** in `tags(...)`, which is the one thing moving these operations out of `user-data` actually cost. Declined: an unparseable stored `public_id` answers 422, blaming the caller for a row this server wrote. Unreachable, and `list_scrobble_links` has the same shape on `main`. Claude-Session: https://claude.ai/code/session_01HreLtK4rFopmncpZEHzp59 Signed-off-by: InstaZDLL <github.105mh@8shield.net>

A fourth review, narrowly scoped to the behaviour change and the `sed` moves. It verified both by mutation rather than by reading, and found one thing — mine, and of the class the previous commit had just established. `ScrobbleLinkState` still published "Decision 12" from its `///`, twenty lines above the type I had cleaned for exactly that. It is the 200 body of `GET /api/v2/scrobble-links`, so this branch's own route was shipping it to every generated client. Its `uncertain` field also carried an intra-doc link to `DomainServices::retry_uncertain_scrobble`, which OpenAPI publishes as literal brackets naming a Rust symbol no client can resolve. Both moved or dropped. And the ordering comment in `tests/service.rs` claimed more than the assertion holds. It pins admin-before-secret; moving `read_secret_env` between the admin check and the account lookup would still fail on the admin and leave the test green. The comment says that now. Recorded from the review rather than changed: a retried original, and any entry under an unlinked generation, are unreachable for both gestures while staying `uncertain` for ever. Nothing deletes outbox rows, so no pruning can resurrect them, and no counter names them. That is the design — the trace explaining a deliberate duplicate has to survive — not an oversight. Claude-Session: https://claude.ai/code/session_01HreLtK4rFopmncpZEHzp59 Signed-off-by: InstaZDLL <github.105mh@8shield.net>

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docs/rfcs/RFC-010-external-scrobbling.md
tests/native_api.rs
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📝 Walkthrough

Walkthrough

Le changement ajoute les routes API, les commandes CLI et les services de domaine pour gérer les liens de scrobbling et les écoutes incertaines. Il met à jour OpenAPI, la documentation d’environnement et la RFC. Des tests couvrent les parcours HTTP, service et CLI.

Changes

Gestion du scrobbling

Layer / File(s)	Summary
État des liens et écoutes incertaines `src/services/mod.rs`, `src/services/scrobbling.rs`	Le service expose `UncertainScrobble` et `uncertain_scrobbles`. Il filtre les entrées déjà retentées ou liées à une destination supprimée.
Routes HTTP et contrat OpenAPI `src/api/mod.rs`, `src/api/scrobbling.rs`, `src/lib.rs`	L’API ajoute les routes de liaison, de déliaison, de consultation, de suppression et de nouvelle tentative. Les permissions, fournisseurs, secrets masqués et réponses OpenAPI sont définis.
Commandes CLI et documentation `src/cli.rs`, `.env.example`, `docs/rfcs/RFC-010-external-scrobbling.md`	La CLI ajoute `scrobble link`, `unlink` et `status`. Elle valide les fournisseurs et les secrets. L’exemple d’environnement et la RFC décrivent ces surfaces.
Validation des parcours `tests/native_api.rs`, `tests/scrobbling.rs`, `tests/service.rs`	Les tests couvrent l’isolation entre comptes, les liens, les écoutes incertaines, les retries, les suppressions et les contrôles CLI.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~30 minutes

Change: Feature

Sequence Diagram(s)

sequenceDiagram
  participant Client
  participant ScrobblingRoutes
  participant DomainServices
  Client->>ScrobblingRoutes: Demande de consultation ou d’action
  ScrobblingRoutes->>DomainServices: Vérification des permissions et appel du service
  DomainServices-->>ScrobblingRoutes: État, entrées ou nouvel identifiant
  ScrobblingRoutes-->>Client: Réponse HTTP

Merge Risk: 🔵 Low · up to be43b

The uncertain-scrobble response contract needs confirmation before merge because clients may receive an unintended field.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 77.50% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 40 functions across 9 files. (1 skipped: …	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	Le titre décrit les deux axes principaux du changement : la liaison d’un jeton de scrobbling et le traitement des écoutes incertaines. La formulation est informelle, mais elle reste liée et suffisamme…
Description check	✅ Passed	La description couvre le résumé, les changements, le plan de test, les décisions techniques, les limites du périmètre et les résultats de vérification. Elle ne reprend pas exactement les cases du modè…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

Docstring coverage is 77.50% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 40 functions across 9 files. (1 skipped: 1 unsupported.)

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The header already said the native routes and the CLI were no longer outside; it could not name what put them inside until the pull request existed. Claude-Session: https://claude.ai/code/session_01HreLtK4rFopmncpZEHzp59 Signed-off-by: InstaZDLL <github.105mh@8shield.net>

Cosmetic, and said as such: a sed insertion left one line at half the width of every other in the block. Claude-Session: https://claude.ai/code/session_01HreLtK4rFopmncpZEHzp59 Signed-off-by: InstaZDLL <github.105mh@8shield.net>

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Inline comments:
In `@docs/rfcs/RFC-010-external-scrobbling.md`:
- Around line 16-18: Clarify the CLI scope in the RFC passage by stating that it
supports only linking, unlinking, and viewing status; replace the ambiguous
“mêmes gestes” wording so it does not imply support for responding to uncertain
listens or other undocumented operations.

In `@src/api/scrobbling.rs`:
- Around line 153-159: Update list_uncertain_scrobbles to return an API-layer
DTO containing only id, provider, played_at, attempts, and last_failure; map the
values from services::UncertainScrobble before wrapping them in Json, and update
the utoipa response annotation to reference the DTO instead of the service type.

In `@src/cli.rs`:
- Line 587: Move the secret environment lookup out of the CLI flow and into
config.rs by exposing a config-level function that wraps read_secret_env and its
std::env::var access. Update the command’s use of read_secret_env near
args.token_env to call the new config function, keeping all environment access
confined to config.rs.

In `@tests/native_api.rs`:
- Around line 352-357: Extend the HTTP test around send_as_stranger for DELETE
/api/v2/scrobble-queue/uncertain/{entry} to exercise a second uncertain entry,
delete it using the owner’s token, and assert the successful response status and
that the entry is absent from the resulting list. Keep the existing stranger 404
assertion.
- Around line 117-124: Extend the HTTP test around the PUT request in
tests/native_api.rs to submit a secret containing only whitespace for a known
provider, and assert that the response status is
StatusCode::UNPROCESSABLE_ENTITY. Keep the existing valid-secret and
unknown-provider cases unchanged.

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.env.example
docs/rfcs/RFC-010-external-scrobbling.md
src/api/mod.rs
src/api/scrobbling.rs
src/cli.rs
src/lib.rs
src/services/mod.rs
src/services/scrobbling.rs
tests/native_api.rs
tests/scrobbling.rs
tests/service.rs

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CodeQL raises `rust/hard-coded-cryptographic-value` on every new value that reaches `security::hash_password`, and these four accounts reached it only to exist. None of them ever authenticates: the CLI resolves an account by username and checks a role, and nothing in this file logs in as one. So they are inserted, with a placeholder where a hash would be. Two alerts go with them. The technique is the one measured on #191 and already used by `fixture()` in `tests/scrobbling.rs`. The two accounts in `tests/native_api.rs` stay as they are: those do log in, and a placeholder would break them. Claude-Session: https://claude.ai/code/session_01HreLtK4rFopmncpZEHzp59 Signed-off-by: InstaZDLL <github.105mh@8shield.net>

Two branches these routes have were reachable in the suite only through what they refuse. A blank secret: the unknown-provider case never reaches the check, because the provider parse answers first. Spaces rather than an empty string, so that a guard written before the trim instead of after it would not pass. A discard that succeeds: the delete route was measured refusing a stranger and nothing else, which a handler refusing everybody would satisfy just as well. The copy the retry queued comes back ambiguous in its turn, and that is the entry this one throws away — then asks again, and discards again, so that "gone from the queue" is distinguished from "hidden from one listing". Both were inverted: removing `secret.is_empty()` answers 204 instead of 422, and an UPDATE that touches the row without changing its state leaves the entry listed while the stranger is still refused. Claude-Session: https://claude.ai/code/session_01HreLtK4rFopmncpZEHzp59 Signed-off-by: InstaZDLL <github.105mh@8shield.net>

"Les mêmes gestes" read as though an operator could answer an uncertain listen from a shell. They cannot, and deliberately: decision 13 asks that choice of the person whose listen it is. Claude-Session: https://claude.ai/code/session_01HreLtK4rFopmncpZEHzp59 Signed-off-by: InstaZDLL <github.105mh@8shield.net>

`tests/service.rs` says it holds probes, the embedded client and the backup bundle. #193 put two command-line tests in it anyway, and this branch added a third, so the file stopped matching its own first line. Asked about it, I said the file was where CLI tests live — describing the state I had created rather than any intention. `tests/cli.rs` now holds the three, with `run_cli` and `inserted_account`, and is declared in `Cargo.toml`; `CLAUDE.md` counts fifteen targets instead of fourteen. `service.rs` keeps what its header names, plus how a request comes to be named, and says where the rest went. One doc comment stops being hypothetical: the note about a subprocess closing the environment-variable gap now points at the test in the same file that does. Claude-Session: https://claude.ai/code/session_01HreLtK4rFopmncpZEHzp59 Signed-off-by: InstaZDLL <github.105mh@8shield.net>

InstaZDLL added 6 commits September 13, 2026 20:56

github-actions Bot added type: feat New feature scope: server Server core (Rust) scope: docs Docs, README, assets scope: api Native /api/v2 surface size: xl > 500 lines labels Sep 13, 2026

github-actions Bot added type: feat New feature and removed type: feat New feature labels Sep 13, 2026

github-advanced-security Bot found potential problems Sep 13, 2026

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coderabbitai Bot requested changes Sep 13, 2026

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Comment thread docs/rfcs/RFC-010-external-scrobbling.md Outdated

Comment thread src/api/scrobbling.rs

Comment thread src/cli.rs

Comment thread tests/native_api.rs

Comment thread tests/native_api.rs

InstaZDLL added 3 commits September 14, 2026 00:36

github-actions Bot added type: feat New feature and removed type: feat New feature labels Sep 13, 2026

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InstaZDLL merged commit 5228640 into main Sep 13, 2026
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InstaZDLL deleted the feat/somewhere-to-link-a-token branch September 13, 2026 22:51

InstaZDLL mentioned this pull request Sep 13, 2026

fix: what a stranger can put in front of an observer #194

Merged

InstaZDLL mentioned this pull request Sep 14, 2026

fix(scrobbling): spend the joker on the entry, not on its descendant #199

Merged

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feat(scrobbling): somewhere to link a token, and to answer for a listen - #193

feat(scrobbling): somewhere to link a token, and to answer for a listen#193
InstaZDLL merged 11 commits into
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Walkthrough

Changes

Sequence Diagram(s)

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Summary

The surface

A gap the RFC did not name

The command line

Verification

Three rounds of review, and what each one found

And a third round

Also here

Still out of scope, on purpose

Summary by CodeRabbit

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Walkthrough

Changes

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InstaZDLL commented Sep 13, 2026 •

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