| 1 | import { noGrant } from "./errors.js"; |
| 2 | |
| 3 | export interface BrowserGrant { |
| 4 | grantId: string; |
| 5 | taskId: string; |
| 6 | sessionId: string; |
| 7 | diagnosticScope?: string; |
| 8 | generation: string; |
| 9 | createdAt: number; |
| 10 | } |
| 11 | |
| 12 | export interface GrantRegistryDeps { |
| 13 | generation(): string; |
| 14 | now?(): number; |
| 15 | onRevoked?(grant: BrowserGrant): void; |
| 16 | } |
| 17 | |
| 18 | // Grants are minted by Go per task (its "tabId") and die with the service |
| 19 | // generation that minted them, so a restarted service can never act on a |
| 20 | // grant it does not remember. |
| 21 | export class GrantRegistry { |
| 22 | private readonly grants = new Map<string, BrowserGrant>(); |
| 23 | private generation = ""; |
| 24 | private readonly revokedListeners = new Set<(grant: BrowserGrant) => void>(); |
| 25 | |
| 26 | constructor(private readonly deps: GrantRegistryDeps) {} |
| 27 | |
| 28 | onRevoke(listener: (grant: BrowserGrant) => void): () => void { |
| 29 | this.revokedListeners.add(listener); |
| 30 | return () => { this.revokedListeners.delete(listener); }; |
| 31 | } |
| 32 | |
| 33 | install(input: { grantId: string; taskId: string; sessionId: string; diagnosticScope?: string }): BrowserGrant { |
| 34 | if (input.grantId === "" || input.taskId === "") throw noGrant("grantId and tabId are required"); |
| 35 | const generation = this.deps.generation(); |
| 36 | if (generation === "") throw noGrant("desktop service is not running"); |
| 37 | this.generation = generation; |
| 38 | const grant: BrowserGrant = { ...input, generation, createdAt: (this.deps.now ?? Date.now)() }; |
| 39 | this.grants.set(input.grantId, grant); |
| 40 | return grant; |
| 41 | } |
| 42 | |
| 43 | revoke(grantId: string): BrowserGrant | null { |
| 44 | const grant = this.grants.get(grantId); |
| 45 | if (!grant) return null; |
| 46 | this.grants.delete(grantId); |
| 47 | this.deps.onRevoked?.(grant); |
| 48 | for (const listener of this.revokedListeners) listener(grant); |
| 49 | return grant; |
| 50 | } |
| 51 | |
| 52 | // A generation change (service restart) retires every grant at once. |
| 53 | observeGeneration(generation: string): void { |
| 54 | if (generation === this.generation) return; |
| 55 | this.generation = generation; |
| 56 | for (const grantId of [...this.grants.keys()]) this.revoke(grantId); |
| 57 | } |
| 58 | |
| 59 | verify(grantId: string): BrowserGrant { |
| 60 | const grant = this.grants.get(grantId); |
| 61 | if (!grant) throw noGrant(`unknown grant ${grantId || "(empty)"}`); |
| 62 | if (grant.generation !== this.deps.generation()) { |
| 63 | this.revoke(grantId); |
| 64 | throw noGrant("grant belongs to an earlier service generation"); |
| 65 | } |
| 66 | return grant; |
| 67 | } |
| 68 | |
| 69 | // The tab must belong to the grant's task; a grant never reaches across. |
| 70 | verifyTab(grantId: string, tabTaskId: string | undefined, tabSessionId?: string): BrowserGrant { |
| 71 | const grant = this.verify(grantId); |
| 72 | if (tabTaskId === undefined) throw noGrant("unknown browser tab"); |
| 73 | if (tabTaskId !== grant.taskId) throw noGrant("browser tab belongs to another task"); |
| 74 | if ((tabSessionId ?? "") !== grant.sessionId) throw noGrant("browser tab belongs to another session"); |
| 75 | return grant; |
| 76 | } |
| 77 | |
| 78 | get size(): number { |
| 79 | return this.grants.size; |
| 80 | } |
| 81 | |
| 82 | // Diagnostic attribution follows live grants, not a separately evicted |
| 83 | // cache. This read does not authorize access or revoke stale generations. |
| 84 | diagnosticScopeForTab(taskId: string, sessionId: string): string | undefined { |
| 85 | let scope: string | undefined; |
| 86 | const generation = this.deps.generation(); |
| 87 | for (const grant of this.grants.values()) { |
| 88 | if (grant.generation !== generation || grant.taskId !== taskId || grant.sessionId !== sessionId || !grant.diagnosticScope || !/^[a-f0-9]{64}$/.test(grant.diagnosticScope)) continue; |
| 89 | if (scope && scope !== grant.diagnosticScope) return undefined; |
| 90 | scope = grant.diagnosticScope; |
| 91 | } |
| 92 | return scope; |
| 93 | } |
| 94 | } |
| 95 |