A lexicon-driven AppView for ATProto.
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19 kB · 513 lines
Rust
at dev
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pub use happyview_scopes::RepoAction;use happyview_scopes::{ AccountPermission, BlobPermission, IdentityPermission, IncludeScope, RepoPermission, RpcPermission, ScopePermissions,};
/// The legacy `transition:` values that mean anything. An authorization server/// refuses any other, so refusing here turns a dead grant into a message.const TRANSITION_VALUES: [&str; 3] = ["generic", "chat.bsky", "email"];
pub fn parse(input: &str) -> Vec<String> { happyview_scopes::parse_scope_list(input)}
/// Validate one scope token, returning an operator-facing message on failure.////// The accept/reject decision is the crate's; only the wording is ours. Where a/// mistake is common and its server-side error unhelpful, the message names the/// fix rather than restating the rejection.pub fn validate(scope: &str) -> Result<(), String> { if scope.is_empty() { return Err("scope must not be empty".into()); }
if scope == "atproto" { return Ok(()); }
let prefix = match scope.split_once([':', '?']) { Some((prefix, _)) => prefix, None => return Err(format!("unknown scope: {scope}")), };
match prefix { "repo" => { RepoPermission::parse(scope).map(|_| ()).ok_or_else(|| repo_scope_error(scope)) } "blob" => BlobPermission::parse(scope) .map(|_| ()) .ok_or_else(|| format!("invalid blob scope: {scope} — expected type/subtype, e.g. blob:image/* or blob:*/*")), "rpc" => RpcPermission::parse(scope).map(|_| ()).ok_or_else(|| { // Overwhelmingly the reason an `rpc:` scope fails: `aud` is // required by the grammar and easy to omit. if !scope.contains("aud=") { format!( "invalid rpc scope: {scope} — rpc scopes require an audience, \ e.g. {scope}?aud=* or ?aud=did:web:example.com%23service" ) } else { format!( "invalid rpc scope: {scope} — aud must be * or an absolute DID reference \ like did:web:example.com%23service, and rpc:*?aud=* is not allowed" ) } }), "identity" => IdentityPermission::parse(scope) .map(|_| ()) .ok_or_else(|| format!("invalid identity scope: {scope} — expected identity:handle or identity:*")), "account" => AccountPermission::parse(scope) .map(|_| ()) .ok_or_else(|| format!("invalid account scope: {scope} — expected account:<email|repo|status> with an optional ?action=read or ?action=manage")), "include" => IncludeScope::parse(scope) .map(|_| ()) .ok_or_else(|| format!("invalid include scope: {scope} — expected include:<nsid> with an optional ?aud=<did>")), "transition" => match scope.strip_prefix("transition:") { Some(value) if TRANSITION_VALUES.contains(&value) => Ok(()), Some("") | None => Err("transition scope requires a value".into()), Some(other) => Err(format!( "unknown transition scope: {other} — expected one of {}", TRANSITION_VALUES.join(", ") )), }, other => Err(format!("unknown scope prefix: {other}")), }}
/// `repo` gets its own message builder because two of its failure modes are/// common and neither explains itself server-side.fn repo_scope_error(scope: &str) -> String { if let Some((_, query)) = scope.split_once('?') { for pair in query.split('&') { if let Some(value) = pair.strip_prefix("action=") && value.contains(',') { let repeated: Vec<String> = value .split(',') .filter(|a| !a.is_empty()) .map(|a| format!("action={a}")) .collect(); return format!( "invalid repo scope: {scope} — repo actions are repeated parameters, \ not a comma-separated list; write {}", repeated.join("&") ); } } } format!( "invalid repo scope: {scope} — expected repo:<nsid> or repo:* with optional \ repeated ?action= parameters (create, update, delete)" )}
pub fn client_base_scopes(scope: Option<&str>, client_id: &str) -> String { if let Some(s) = scope.map(str::trim).filter(|s| !s.is_empty()) { return s.to_string(); }
let Some((_, query)) = client_id.split_once('?') else { return String::new(); }; for pair in query.split('&') { let Some(value) = pair.strip_prefix("scope=") else { continue; }; let value = value.replace('+', " "); return urlencoding::decode(&value) .map(|s| s.into_owned()) .unwrap_or(value); } String::new()}
pub fn union(scope_strings: &[String], base: &str) -> String { let mut all: Vec<String> = parse(base); for grant_scopes in scope_strings { for scope in parse(grant_scopes) { if !all.contains(&scope) { all.push(scope); } } } all.sort(); all.join(" ")}
/// May this grant write `collection` with `action`?////// Delegates to the shared crate, which is where `transition:generic` is/// honoured. It previously was not honoured at all here: both matchers stripped/// a `repo:`/`blob:` prefix and bailed, so a grant holding only the broad legacy/// scope stored happily and then failed every authorization.pub fn allows_repo(scopes: &[String], collection: &str, action: RepoAction) -> bool { ScopePermissions::from_scopes(scopes.to_vec()).allows_repo(collection, action)}
/// May this grant upload a blob of this content type?////// Both sides are canonicalised first, which is HTTP's business rather than the/// scope grammar's:////// - `mime` is a raw `Content-Type` header, so its parameters are stripped/// (`text/plain; charset=utf-8` → `text/plain`). The crate answers only about/// a clean MIME type and refuses to match anything that is not one./// - `blob:` scope values are lower-cased. The reference matches/// case-sensitively but *canonicalises* to lower case, so `blob:image/PNG`/// round-trips through an authorization server as `blob:image/png` and only a/// hand-written scope would still carry upper case. Folding it here means a/// grant behaves the same either way.pub fn allows_blob(scopes: &[String], mime: &str) -> bool { let mime = mime .split(';') .next() .unwrap_or(mime) .trim() .to_ascii_lowercase();
let canonical: Vec<String> = scopes .iter() .map(|s| { if s.starts_with("blob:") { s.to_ascii_lowercase() } else { s.clone() } }) .collect();
ScopePermissions::from_scopes(canonical).allows_blob(&mime)}
#[cfg(test)]mod tests { use super::*;
#[test] fn parse_splits_and_dedupes() { let out = parse(" atproto repo:com.example.a \n atproto "); assert_eq!(out, vec!["atproto", "repo:com.example.a"]); }
#[test] fn parse_empty_input_yields_empty() { assert!(parse(" \n\t ").is_empty()); }
#[test] fn validate_accepts_known_shapes() { for s in [ "atproto", "identity:*", "account:email", "repo:*", "repo:com.example.note", "repo:com.example.note?action=create", "repo:com.example.note?action=create&action=update&action=delete", "blob:*/*", "blob:image/*", "blob:image/png", "rpc:*?aud=did:web:example.com%23service", "rpc:com.example.doThing?aud=*", "rpc:com.example.doThing?aud=did:web:example.com%23service", "transition:generic", "transition:chat.bsky", "transition:email", "include:com.example.permissionSet", "include:com.example.permissionSet?aud=did:web:example.com%23service", ] { assert!( validate(s).is_ok(), "expected {s} to validate: {:?}", validate(s) ); } }
/// Adopting the shared crate tightened `validate`, which previously waved /// through anything non-empty after `rpc:`, `identity:`, `account:`, /// `transition:` and `include:`. Every shape below was accepted before and /// is refused now — each one an authorization server would have rejected, /// so this moves the failure from OAuth time to grant-creation time. #[test] fn validate_now_rejects_shapes_it_used_to_wave_through() { for (scope, expected_hint) in [ // `aud` is required by the grammar. ("rpc:*", "require an audience"), ("rpc:com.example.doThing", "require an audience"), // An audience must be absolute — a bare DID has no fragment. ( "rpc:com.example.doThing?aud=did:web:example.com", "absolute DID reference", ), // Unbounded "every method against every audience" is forbidden. ("rpc:*?aud=*", "not allowed"), ("identity:email", "identity:handle"), ("account:bogus", "account:<email|repo|status>"), ("transition:bogus", "expected one of"), ("include:notannsid", "include:<nsid>"), ] { let err = validate(scope).expect_err(&format!("expected {scope} to be rejected")); assert!( err.contains(expected_hint), "{scope}: expected the message to mention {expected_hint:?}, got: {err}" ); } }
/// The comma-joined form parses as one value `"create,update"`, which is /// not an action. An authorization server refuses the whole request with /// `invalid_scope`, so a grant spelled this way can never be authorized — /// catching it here turns a dead-end grant into an actionable message. #[test] fn validate_rejects_comma_joined_actions() { let err = validate("repo:com.example.note?action=create,update,delete").unwrap_err(); assert!( err.contains("action=create&action=update&action=delete"), "error should name the correct spelling, got: {err}" ); }
#[test] fn allows_repo_ignores_comma_joined_actions() { let scopes = parse("repo:com.example.note?action=create,update"); assert!(!allows_repo( &scopes, "com.example.note", RepoAction::Create )); }
#[test] fn allows_repo_reads_repeated_action_params() { let scopes = parse("repo:com.example.note?action=create&action=delete"); assert!(allows_repo(&scopes, "com.example.note", RepoAction::Create)); assert!(allows_repo(&scopes, "com.example.note", RepoAction::Delete)); assert!(!allows_repo( &scopes, "com.example.note", RepoAction::Update )); }
#[test] fn validate_rejects_malformed() { for s in [ "", "repo:", "repo:com.example.note?action=", "repo:com.example.note?action=frobnicate", "blob:image", "blob:", "nonsense:thing", "transition:", "include:", ] { assert!(validate(s).is_err(), "expected {s} to be rejected"); } }
#[test] fn union_merges_dedupes_and_sorts() { let grants = vec![ "repo:com.example.b atproto".to_string(), "repo:com.example.a atproto".to_string(), ]; let out = union(&grants, "atproto identity:*"); assert_eq!( out, "atproto identity:* repo:com.example.a repo:com.example.b" ); }
#[test] fn union_with_no_grants_is_just_base() { assert_eq!(union(&[], "atproto identity:*"), "atproto identity:*"); }
#[test] fn client_base_scopes_prefers_the_metadata_field() { assert_eq!( client_base_scopes(Some("atproto identity:*"), "https://example.com/x.json"), "atproto identity:*" ); }
#[test] fn client_base_scopes_falls_back_to_a_loopback_client_id() { let client_id = "http://localhost?redirect_uri=http%3A%2F%2F127.0.0.1%3A3000%2Fauth%2Fcallback&scope=atproto+identity%3A*"; assert_eq!( client_base_scopes(None, client_id), "atproto identity:*", "a loopback client's scopes must not vanish from the advertised doc" ); }
#[test] fn client_base_scopes_is_empty_when_there_is_nowhere_to_read_it() { assert_eq!(client_base_scopes(None, "http://localhost"), ""); assert_eq!(client_base_scopes(Some(" "), "http://localhost"), ""); }
#[test] fn union_carries_every_base_scope_through() { let out = union( &["repo:com.example.a".to_string()], "atproto identity:* account:email", ); assert_eq!(out, "account:email atproto identity:* repo:com.example.a"); }
#[test] fn allows_repo_defaults_to_all_actions() { let scopes = parse("repo:com.example.note"); assert!(allows_repo(&scopes, "com.example.note", RepoAction::Create)); assert!(allows_repo(&scopes, "com.example.note", RepoAction::Update)); assert!(allows_repo(&scopes, "com.example.note", RepoAction::Delete)); }
#[test] fn allows_repo_honours_action_list() { let scopes = parse("repo:com.example.note?action=create&action=update"); assert!(allows_repo(&scopes, "com.example.note", RepoAction::Create)); assert!(allows_repo(&scopes, "com.example.note", RepoAction::Update)); assert!(!allows_repo( &scopes, "com.example.note", RepoAction::Delete )); }
#[test] fn allows_repo_wildcard_covers_any_collection() { let scopes = parse("repo:*"); assert!(allows_repo( &scopes, "com.example.anything", RepoAction::Delete )); }
#[test] fn allows_repo_rejects_other_collections() { let scopes = parse("repo:com.example.note"); assert!(!allows_repo( &scopes, "com.example.other", RepoAction::Create )); }
#[test] fn allows_repo_is_false_without_any_repo_scope() { let scopes = parse("atproto identity:*"); assert!(!allows_repo( &scopes, "com.example.note", RepoAction::Create )); }
#[test] fn allows_blob_matches_wildcards() { assert!(allows_blob(&parse("blob:*/*"), "image/png")); assert!(allows_blob(&parse("blob:image/*"), "image/png")); assert!(allows_blob(&parse("blob:image/png"), "image/png")); assert!(!allows_blob(&parse("blob:image/*"), "video/mp4")); assert!(!allows_blob(&parse("blob:image/png"), "image/jpeg")); assert!(!allows_blob(&parse("atproto"), "image/png")); }
#[test] fn allows_blob_ignores_mime_parameters() { assert!(allows_blob( &parse("blob:text/plain"), "text/plain; charset=utf-8" )); }
#[test] fn allows_repo_rejects_unrecognized_query() { let scopes = parse("repo:com.example.note?foo=bar"); assert!(!allows_repo( &scopes, "com.example.note", RepoAction::Create )); }
#[test] fn allows_blob_matches_case_insensitively() { assert!(allows_blob(&parse("blob:image/PNG"), "image/png")); assert!(allows_blob(&parse("blob:image/png"), "image/PNG")); }
// `transition:generic` is the broad legacy grant. `validate` accepts it, so a // grant can be stored holding nothing else — and both matchers used to strip // a `repo:`/`blob:` prefix and bail, making it invisible at authorization // time. The reference implementation (`ScopePermissionsTransition`) short // -circuits `allowsRepo`/`allowsBlob` to true when it is present. #[test] fn transition_generic_allows_every_repo_action() { let scopes = parse("atproto transition:generic"); for action in [RepoAction::Create, RepoAction::Update, RepoAction::Delete] { assert!( allows_repo(&scopes, "com.example.note", action), "transition:generic should allow {}", action.as_str() ); } }
#[test] fn transition_generic_allows_any_collection() { let scopes = parse("atproto transition:generic"); assert!(allows_repo( &scopes, "app.bsky.feed.post", RepoAction::Create )); }
#[test] fn transition_generic_allows_any_blob() { let scopes = parse("atproto transition:generic"); assert!(allows_blob(&scopes, "image/png")); assert!(allows_blob(&scopes, "video/mp4")); }
// Only `transition:generic` is broad. `transition:email` and // `transition:chat.bsky` are narrow legacy grants that cover neither repo // writes nor blob uploads, so they must not open the same door. #[test] fn other_transition_scopes_do_not_grant_repo_or_blob() { let scopes = parse("atproto transition:email transition:chat.bsky"); assert!(!allows_repo( &scopes, "com.example.note", RepoAction::Create )); assert!(!allows_blob(&scopes, "image/png")); }
#[test] fn validate_repo_rejects_malformed_nsid() { for s in ["repo:not an nsid", "repo:com"] { assert!(validate(s).is_err(), "expected {s} to be rejected"); } }
#[test] fn validate_repo_accepts_wildcard_and_valid_nsid() { assert!(validate("repo:*").is_ok()); assert!(validate("repo:com.example.note").is_ok()); }}