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\"../wire\";\n\nexport const MAX_WATCH_FRAME_REPOSITORIES = 50;\nexport const MAX_WATCHED_REPOSITORIES = 200;\nexport const MAX_WATCHED_DOCUMENTS = 500;\n\nconst REPOSITORY_ID = /^[A-Za-z0-9_=+/-]{1,200}$/;\nconst OWNER = /^[A-Za-z0-9](?:[A-Za-z0-9]|-(?=[A-Za-z0-9])){0,38}$/;\nconst REPOSITORY = /^[A-Za-z0-9._-]{1,100}$/;\n\nexport type WatchedRepository = Sidebar.WatchedRepository;\nexport type RepositoryIdentity = Omit;\n\ntype RepositoryOutcome = \"watched\" | \"refused\" | \"unavailable\" | \"superseded\";\n\ntype Authorization = {\n\tidentity: RepositoryIdentity;\n\toutcome: Promise;\n};\n\nexport type DecisionWatch = {\n\trepositories: Map;\n\tauthorizing: Map;\n\treleased: boolean;\n};\n\nexport type WatchTopics = {\n\tsubscribe(repositoryId: string): void;\n\tunsubscribe(repositoryId: string): void;\n};\n\nexport type RepositoryAuthorizer = (repository: RepositoryIdentity) => Promise;\n\nexport type WatchOutcome = {\n\twatched: WatchedRepository[];\n\trefused: string[];\n\tunavailable: string[];\n};\n\nexport function decisionWatch(): DecisionWatch {\n\treturn { repositories: new Map(), authorizing: new Map(), released: false };\n}\n\ntype RepositoryRead = (\n\towner: string,\n\tname: string,\n) => Promise<{ id: string; permissions: { pull: boolean } } | undefined>;\n\nexport function repositoryReader(read: RepositoryRead): RepositoryAuthorizer {\n\treturn async repository => {\n\t\ttry {\n\t\t\tlet found = await read(repository.owner, repository.name);\n\t\t\treturn found?.id === repository.repositoryId && found.permissions.pull\n\t\t\t\t? \"allowed\"\n\t\t\t\t: \"denied\";\n\t\t} catch (err) {\n\t\t\treturn err instanceof GitHubError\n\t\t\t\t\t&& (err.status === 429 || err.status === 502 || err.status === 503)\n\t\t\t\t? \"unavailable\"\n\t\t\t\t: \"denied\";\n\t\t}\n\t};\n}\n\nfunction text(value: unknown, pattern: RegExp): value is string {\n\treturn typeof value === \"string\" && pattern.test(value);\n}\n\nexport function watchRequest(value: unknown): WatchedRepository[] | undefined {\n\tif (!Array.isArray(value) || value.length > MAX_WATCH_FRAME_REPOSITORIES) return undefined;\n\tlet seen = new Set();\n\tlet repositories: WatchedRepository[] = [];\n\tfor (let entry of value) {\n\t\tif (!entry || typeof entry !== \"object\" || Array.isArray(entry)) return undefined;\n\t\tlet { repositoryId, owner, name, channelIds } = entry as Record;\n\t\tif (!text(repositoryId, REPOSITORY_ID) || seen.has(repositoryId)) return undefined;\n\t\tif (!text(owner, OWNER) || !text(name, REPOSITORY)) return undefined;\n\t\tif (\n\t\t\t!Array.isArray(channelIds) || channelIds.length > MAX_WATCHED_DOCUMENTS\n\t\t\t|| !channelIds.every(id => typeof id === \"string\" && isChannelId(id))\n\t\t) return undefined;\n\t\tseen.add(repositoryId);\n\t\trepositories.push({ repositoryId, owner, name, channelIds: [...new Set(channelIds)] });\n\t}\n\treturn repositories;\n}\n\nexport function unwatchRequest(value: unknown): string[] | undefined {\n\tif (!Array.isArray(value) || value.length > MAX_WATCHED_REPOSITORIES) return undefined;\n\tif (!value.every(id => text(id, REPOSITORY_ID))) return undefined;\n\treturn [...new Set(value as string[])];\n}\n\nfunction sameRepository(\n\tcurrent: RepositoryIdentity | undefined,\n\trequested: RepositoryIdentity,\n): boolean {\n\treturn current?.repositoryId === requested.repositoryId\n\t\t&& current.owner === requested.owner\n\t\t&& current.name === requested.name;\n}\n\nfunction tracked(watch: DecisionWatch): number {\n\tlet ids = new Set(watch.repositories.keys());\n\tfor (let id of watch.authorizing.keys()) ids.add(id);\n\treturn ids.size;\n}\n\nfunction drop(watch: DecisionWatch, repositoryId: string, topics: WatchTopics): void {\n\tif (!watch.repositories.delete(repositoryId)) return;\n\ttopics.unsubscribe(repositoryId);\n}\n\nfunction authorizeRepository(\n\twatch: DecisionWatch,\n\tidentity: RepositoryIdentity,\n\tauthorize: RepositoryAuthorizer,\n\ttopics: WatchTopics,\n): Authorization {\n\tlet id = identity.repositoryId;\n\tlet authorization: Authorization = {\n\t\tidentity,\n\t\toutcome: Promise.resolve()\n\t\t\t.then(() => authorize(identity))\n\t\t\t.catch((): AuthorizationResult => \"unavailable\")\n\t\t\t.then(result => {\n\t\t\t\tif (watch.released || watch.authorizing.get(id) !== authorization) return \"superseded\";\n\t\t\t\twatch.authorizing.delete(id);\n\t\t\t\tif (result === \"unavailable\") return \"unavailable\";\n\t\t\t\tif (result === \"denied\") {\n\t\t\t\t\tdrop(watch, id, topics);\n\t\t\t\t\treturn \"refused\";\n\t\t\t\t}\n\t\t\t\tif (!watch.repositories.has(id)) topics.subscribe(id);\n\t\t\t\twatch.repositories.set(id, identity);\n\t\t\t\treturn \"watched\";\n\t\t\t}),\n\t};\n\twatch.authorizing.set(id, authorization);\n\treturn authorization;\n}\n\nfunction watchRepository(\n\twatch: DecisionWatch,\n\t{ repositoryId, owner, name }: WatchedRepository,\n\tauthorize: RepositoryAuthorizer,\n\ttopics: WatchTopics,\n): Promise {\n\tlet identity = { repositoryId, owner, name };\n\tif (watch.released) return Promise.resolve(\"superseded\");\n\tif (sameRepository(watch.repositories.get(repositoryId), identity)) {\n\t\treturn Promise.resolve(\"watched\");\n\t}\n\tlet pending = watch.authorizing.get(repositoryId);\n\tif (pending && sameRepository(pending.identity, identity)) return pending.outcome;\n\tlet known = watch.repositories.has(repositoryId) || !!pending;\n\tif (!known && tracked(watch) >= MAX_WATCHED_REPOSITORIES) return Promise.resolve(\"refused\");\n\treturn authorizeRepository(watch, identity, authorize, topics).outcome;\n}\n\nexport async function watchDecisions(\n\twatch: DecisionWatch,\n\trequested: WatchedRepository[],\n\tauthorize: RepositoryAuthorizer,\n\ttopics: WatchTopics,\n): Promise {\n\tlet outcomes = await Promise.all(\n\t\trequested.map(repository => watchRepository(watch, repository, authorize, topics)),\n\t);\n\tlet result: WatchOutcome = { watched: [], refused: [], unavailable: [] };\n\trequested.forEach((repository, index) => {\n\t\tlet outcome = outcomes[index];\n\t\tif (outcome === \"watched\") result.watched.push(repository);\n\t\telse if (outcome === \"refused\") result.refused.push(repository.repositoryId);\n\t\telse if (outcome === \"unavailable\") result.unavailable.push(repository.repositoryId);\n\t});\n\treturn result;\n}\n\nexport function unwatchDecisions(\n\twatch: DecisionWatch,\n\trepositoryIds: string[],\n\ttopics: WatchTopics,\n): void {\n\tfor (let repositoryId of repositoryIds) {\n\t\twatch.authorizing.delete(repositoryId);\n\t\tdrop(watch, repositoryId, topics);\n\t}\n}\n\nexport async function recheckDecisionWatch(\n\twatch: DecisionWatch,\n\tauthorize: RepositoryAuthorizer,\n\ttopics: WatchTopics,\n): Promise {\n\tlet current = [...watch.repositories.values()];\n\tlet results = await Promise.all(\n\t\tcurrent.map(repository =>\n\t\t\tauthorize(repository).catch((): AuthorizationResult => 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