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A lexicon-driven AppView for ATProto.
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11 kB · 381 lines
Rust
at dev
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#[derive(Debug, Clone, Copy, PartialEq, Eq)]pub enum RepoAction { Create, Update, Delete,}
impl RepoAction { pub fn as_str(&self) -> &'static str { match self { Self::Create => "create", Self::Update => "update", Self::Delete => "delete", } }}
pub fn parse(input: &str) -> Vec<String> { let mut seen = Vec::new(); for token in input.split_whitespace() { let token = token.to_string(); if !seen.contains(&token) { seen.push(token); } } seen}
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, rest) = match scope.split_once(':') { Some(parts) => parts, None => return Err(format!("unknown scope: {scope}")), };
match prefix { "repo" => validate_repo(rest), "blob" => validate_blob(rest), "rpc" | "identity" | "account" | "transition" | "include" => { if rest.is_empty() { Err(format!("{prefix} scope requires a value")) } else { Ok(()) } } other => Err(format!("unknown scope prefix: {other}")), }}
fn validate_repo(rest: &str) -> Result<(), String> { let (target, query) = split_query(rest); if target.is_empty() { return Err("repo scope requires a collection or *".into()); } if target != "*" { Nsid::new(target.to_string()).map_err(|_| format!("invalid NSID: {target}"))?; } let Some(query) = query else { return Ok(()) };
let Some(actions) = query.strip_prefix("action=") else { return Err(format!("unsupported repo scope parameter: {query}")); }; if actions.is_empty() { return Err("repo scope action list must not be empty".into()); } for action in actions.split(',') { if !matches!(action, "create" | "update" | "delete") { return Err(format!("unknown repo action: {action}")); } } Ok(())}
fn validate_blob(rest: &str) -> Result<(), String> { let (target, _) = split_query(rest); let Some((ty, subtype)) = target.split_once('/') else { return Err("blob scope must be type/subtype".into()); }; if ty.is_empty() || subtype.is_empty() { return Err("blob scope must be type/subtype".into()); } Ok(())}
fn split_query(rest: &str) -> (&str, Option<&str>) { match rest.split_once('?') { Some((target, query)) => (target, Some(query)), None => (rest, None), }}
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(" ")}
pub fn allows_repo(scopes: &[String], collection: &str, action: RepoAction) -> bool { scopes.iter().any(|scope| { let Some(rest) = scope.strip_prefix("repo:") else { return false; }; let (target, query) = split_query(rest);
if target != "*" && target != collection { return false; }
match query { // No query at all means all actions. None => true, Some(q) => match q.strip_prefix("action=") { Some(actions) => actions.split(',').any(|a| a == action.as_str()), None => false, }, } })}
pub fn allows_blob(scopes: &[String], mime: &str) -> bool { let mime = mime.split(';').next().unwrap_or(mime).trim(); let Some((mime_ty, mime_sub)) = mime.split_once('/') else { return false; };
let mime_ty = mime_ty.to_ascii_lowercase(); let mime_sub = mime_sub.to_ascii_lowercase();
scopes.iter().any(|scope| { let Some(rest) = scope.strip_prefix("blob:") else { return false; }; let (target, _) = split_query(rest); let Some((ty, sub)) = target.split_once('/') else { return false; }; let ty = ty.to_ascii_lowercase(); let sub = sub.to_ascii_lowercase(); (ty == "*" || ty == mime_ty) && (sub == "*" || sub == mime_sub) })}
#[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,update,delete", "blob:*/*", "blob:image/*", "blob:image/png", "rpc:*", "rpc:com.example.doThing?aud=did:web:example.com", "transition:generic", "transition:chat.bsky", "include:com.example.permissionSet", ] { assert!(validate(s).is_ok(), "expected {s} to validate"); } }
#[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,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")); }
#[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()); }}