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Monorepo for Tangled forked from tangled.org/core
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1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980import type { Did, Nsid } from "@atcute/lexicons/syntax";
type RepoAction = "create" | "update" | "delete";
export type Permission = | { readonly resource: "repo"; readonly collection: Nsid; readonly actions: readonly RepoAction[]; } | { readonly resource: "rpc"; readonly lxm: Nsid; readonly aud: Did } | { readonly resource: "identity"; readonly attr: "handle" };
const ANY = "*";
const ALL_ACTIONS: readonly RepoAction[] = ["create", "update", "delete"];
interface Grant { readonly resource: string; readonly positional: string | null; readonly params: URLSearchParams;}
const grantFrom = (scope: string): Grant => { const query = scope.indexOf("?"); const head = query < 0 ? scope : scope.slice(0, query); const params = new URLSearchParams(query < 0 ? "" : scope.slice(query + 1)); const colon = head.indexOf(":"); return colon < 0 ? { resource: head, positional: null, params } : { resource: head.slice(0, colon), positional: head.slice(colon + 1), params };};
const listOf = (grant: Grant, name: string): readonly string[] => grant.positional === null ? grant.params.getAll(name) : grant.positional === "" ? [] : [grant.positional];
const isRepoAction = (value: string): value is RepoAction => (ALL_ACTIONS as readonly string[]).includes(value);
const nameMatches = (granted: string, wanted: Nsid): boolean => granted === ANY || granted === wanted;
const covers = (grant: Grant, wanted: Permission): boolean => { if (grant.resource !== wanted.resource) return false; if (wanted.resource === "identity") { return listOf(grant, "attr").some((attr) => attr === ANY || attr === wanted.attr); } if (wanted.resource === "repo") { const asked = grant.params.getAll("action"); const held = asked.length === 0 ? ALL_ACTIONS : asked.filter(isRepoAction); return ( listOf(grant, "collection").some((granted) => nameMatches(granted, wanted.collection) ) && wanted.actions.every((action) => held.includes(action)) ); } const auds = grant.params.getAll("aud"); return ( auds.some((aud) => aud === ANY || aud === wanted.aud) && listOf(grant, "lxm").some((granted) => nameMatches(granted, wanted.lxm)) );};
export const missingPermissions = ( granted: string, wanted: readonly Permission[]): readonly Permission[] => { const scopes = granted.split(/\s+/).filter((scope) => scope !== ""); const unreadable = scopes.some( (scope) => scope === "transition:generic" || scope.startsWith("include:") ); if (unreadable) return []; const grants = scopes.map(grantFrom); return wanted.filter((permission) => !grants.some((grant) => covers(grant, permission)));};