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Validation is re-derivation. The redirect_uri is the\n * account key: register the same URI at IdP and AS → two distinct IDs, but\n * the IdP can re-derive the AS one because it knows both issuers and the URI.\n */\n\nimport { URLS } from \"./config.ts\";\n\n// Per-server prefixes. The IdP needs to know the AS's prefix too — it's part\n// of what deriveAsClientIdFor uses to match what the AS /register emitted.\nexport const IDP_PREFIX = \"idp\";\nexport const AS_PREFIX = \"as1\";\n\nconst KEY = \"xaa-demo-hmac-key-not-secret\";\nconst enc = new TextEncoder();\n\nlet hmacKey: CryptoKey | undefined;\nasync function key(): Promise {\n return hmacKey ??= await crypto.subtle.importKey(\n \"raw\", enc.encode(KEY), { name: \"HMAC\", hash: \"SHA-256\" }, false, [\"sign\"],\n );\n}\n\nasync function hmacHex(input: string): Promise {\n const sig = await crypto.subtle.sign(\"HMAC\", await key(), enc.encode(input));\n return Array.from(new Uint8Array(sig), (b) => b.toString(16).padStart(2, \"0\")).join(\"\");\n}\n\n/**\n * `resource` (RS URL) is the per-RS dimension: same redirect_uri + same AS,\n * different resource → different client_id. The IdP has all three inputs at\n * token-exchange time (reg_uri in id_token, audience + resource in request).\n * For the IdP's own client_ids it's empty — the IdP doesn't front a resource.\n */\nexport async function deriveClientId(prefix: string, issuer: string, redirectUri: string, resource = \"\"): Promise {\n return `${prefix}_id_${(await hmacHex(`${issuer}|${redirectUri}|${resource}`)).slice(0, 12)}`;\n}\n\nexport async function deriveClientSecret(clientId: string): Promise {\n // Secret keys off the full client_id — prefix is bound, not cosmetic.\n const prefix = clientId.split(\"_id_\")[0];\n return `${prefix}_sec_${(await hmacHex(clientId)).slice(0, 16)}`;\n}\n\n/** /register: inputs in, creds out. Same inputs → same creds (idempotent). */\nexport async function register(prefix: string, issuer: string, redirectUri: string, resource = \"\") {\n const client_id = await deriveClientId(prefix, issuer, redirectUri, resource);\n const client_secret = await deriveClientSecret(client_id);\n return { client_id, client_secret, redirect_uri: redirectUri, ...(resource && { resource }) };\n}\n\n/** Validate a (client_id, client_secret) pair without knowing the redirect_uri. */\nexport async function validateSecret(clientId: string, clientSecret: string): Promise {\n return clientSecret === await deriveClientSecret(clientId);\n}\n\n/** Validate that a client_id was issued for a given redirect_uri at a given issuer. */\nexport async function validateRedirect(prefix: string, issuer: string, clientId: string, redirectUri: string): Promise {\n return clientId === await deriveClientId(prefix, issuer, redirectUri);\n}\n\n/**\n * The IdP's \"app<>app\" mapping. At token-exchange the IdP knows: reg_uri\n * (from id_token), audience (= AS issuer), resource (the MCP URL being\n * requested). Those are exactly what the AS keyed off at /register.\n */\nexport async function deriveAsClientIdFor(asIssuer: string, redirectUri: string, resource: string): Promise {\n return deriveClientId(AS_PREFIX, asIssuer, redirectUri, resource);\n}\n\n/** Canonical redirect_uri for /debug endpoints — matches CC's default port. */\nexport const DEBUG_REDIRECT_URI = \"http://localhost:52118/callback\";\n\n/**\n * Pre-derived creds for /debug/context. AS creds are bound to the todos RS —\n * to get creds for cal, POST /register at the AS with resource=.\n */\nexport async function debugCreds() {\n const idp = await register(IDP_PREFIX, URLS.idp, DEBUG_REDIRECT_URI);\n const as = await register(AS_PREFIX, URLS.as, DEBUG_REDIRECT_URI, `${URLS.rs}/mcp`);\n return { idp, as };\n}\n","deleted","label",[175,157],"shared","permalink","https://www.val.town/x/pcarleton/xaa-mcp-as/code/shared/register.ts","extension","actionData","errors"]