{
  "version": 3,
  "sources": ["../src/envelope.ts"],
  "sourcesContent": ["import type { Envelope, PayloadTag, EnvelopeDecodeOptions, EnvelopeEncodeOptions, EnvelopeSignOptions, SignaturePayload, PayloadSpec, DecodedEnvelope, DelegationPayload, InvocationPayload, Payload } from './types.js'\nimport type { ByteView } from 'multiformats'\nimport type { SignatureType } from 'iso-signatures/types'\nimport * as cbor from '@ipld/dag-cbor'\nimport { isObject } from './util.js'\nimport * as varsig from './index.js'\n\n/** Version */\nexport const VERSION = '1.0.0-rc.1'\n\n/**\n * Get the signature payload for a given payload\n */\nexport function getSignaturePayload (options:{\n  spec:PayloadSpec\n  payload:Payload\n  version?:string\n  signatureType:SignatureType\n}):SignaturePayload {\n    const { spec, version, signatureType, payload } = options\n\n    const payloadTag:PayloadTag = `ucan/${spec}@${version ?? VERSION}` as PayloadTag\n\n    const h = varsig.encode({ enc: 'DAG-CBOR', alg: signatureType })\n\n    const signaturePayload = {\n        h,\n        [payloadTag]: payload,\n    } as SignaturePayload\n\n    return signaturePayload\n}\n\n/**\n * Decode a signature payload\n */\nexport function decodeSignaturePayload (bytes:Uint8Array) {\n    const decoded = cbor.decode(bytes) as unknown\n\n    if (!isObject(decoded)) {\n        throw new TypeError(\n      `Invalid signature payload expected object got ${typeof decoded}`\n        )\n    }\n    if (!('h' in decoded)) {\n        throw new TypeError('Invalid signature payload missing h')\n    }\n    const keys = Object.keys(decoded)\n    if (keys.length !== 2) {\n        throw new TypeError(\n      `Invalid signature payload expected 2 keys got ${keys.length}`\n        )\n    }\n    if (!keys[1].startsWith('ucan/dlg') && !keys[1].startsWith('ucan/inv')) {\n        throw new TypeError('Invalid signature payload missing payload')\n    }\n\n    const payloadTag:PayloadTag = keys[1] as PayloadTag\n    const { alg, enc } = varsig.decode((decoded as SignaturePayload).h)\n    const payload = (decoded as SignaturePayload)[payloadTag]\n    return {\n        alg,\n        enc,\n        payload,\n    }\n}\n\n/**\n * Check if a payload is an invocation payload\n */\nexport function isInvocationPayload (payload:Payload):payload is InvocationPayload {\n    return 'args' in payload\n}\n\n/**\n * Check if a payload is a delegation payload\n */\nexport function isDelegationPayload (payload:Payload):payload is DelegationPayload {\n    return 'pol' in payload\n}\n\nexport async function sign (options:EnvelopeSignOptions) {\n    const { spec, version, signer, payload } = options\n\n    const signaturePayload = getSignaturePayload({\n        spec,\n        version,\n        signatureType: signer.signatureType,\n        payload,\n    })\n    const signature = await signer.sign(cbor.encode(signaturePayload))\n    return {\n        signature,\n        signaturePayload,\n    }\n}\n\n/**\n * Encode a UCAN envelope\n *\n * @see https://github.com/ucan-wg/spec#envelope\n */\nexport function encode (options:EnvelopeEncodeOptions):Uint8Array {\n    const { signature, signaturePayload } = options\n\n    const envelope = [signature, signaturePayload]\n\n    return cbor.encode(envelope)\n}\n\n/**\n * Decode a UCAN envelope\n *\n * @see https://github.com/ucan-wg/spec#envelope\n */\nexport function decode<Spec extends PayloadSpec> (options:EnvelopeDecodeOptions):DecodedEnvelope<Spec> {\n    const { envelope } = options\n\n    const decoded = cbor.decode(envelope as ByteView<Envelope>) as Envelope\n\n    const [signature, sigPayload] = decoded\n    const [_h, payloadTag] = Object.keys(sigPayload)\n    const header = sigPayload.h\n    const payload:DelegationPayload | InvocationPayload = sigPayload[payloadTag as PayloadTag]\n\n    const [_ucan, specVersion] = payloadTag.split('/')\n    const [spec, version] = specVersion.split('@')\n\n    const { alg, enc } = varsig.decode(header)\n\n    return {\n        alg,\n        enc,\n        signature,\n        // Narrow payload type based on Spec\n        payload,\n        spec,\n        version,\n    } as DecodedEnvelope<Spec>\n}\n"],
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