server/helpers/custom-jsonld-signature.ts

   1 import * as AsyncLRU from 'async-lru'
   2 import * as jsonld from 'jsonld'
   3 import { logger } from './logger'
   4
   5 const CACHE = {
   6   'https://w3id.org/security/v1': {
   7     '@context': {
   8       id: '@id',
   9       type: '@type',
  10
  11       dc: 'http://purl.org/dc/terms/',
  12       sec: 'https://w3id.org/security#',
  13       xsd: 'http://www.w3.org/2001/XMLSchema#',
  14
  15       EcdsaKoblitzSignature2016: 'sec:EcdsaKoblitzSignature2016',
  16       Ed25519Signature2018: 'sec:Ed25519Signature2018',
  17       EncryptedMessage: 'sec:EncryptedMessage',
  18       GraphSignature2012: 'sec:GraphSignature2012',
  19       LinkedDataSignature2015: 'sec:LinkedDataSignature2015',
  20       LinkedDataSignature2016: 'sec:LinkedDataSignature2016',
  21       CryptographicKey: 'sec:Key',
  22
  23       authenticationTag: 'sec:authenticationTag',
  24       canonicalizationAlgorithm: 'sec:canonicalizationAlgorithm',
  25       cipherAlgorithm: 'sec:cipherAlgorithm',
  26       cipherData: 'sec:cipherData',
  27       cipherKey: 'sec:cipherKey',
  28       created: { '@id': 'dc:created', '@type': 'xsd:dateTime' },
  29       creator: { '@id': 'dc:creator', '@type': '@id' },
  30       digestAlgorithm: 'sec:digestAlgorithm',
  31       digestValue: 'sec:digestValue',
  32       domain: 'sec:domain',
  33       encryptionKey: 'sec:encryptionKey',
  34       expiration: { '@id': 'sec:expiration', '@type': 'xsd:dateTime' },
  35       expires: { '@id': 'sec:expiration', '@type': 'xsd:dateTime' },
  36       initializationVector: 'sec:initializationVector',
  37       iterationCount: 'sec:iterationCount',
  38       nonce: 'sec:nonce',
  39       normalizationAlgorithm: 'sec:normalizationAlgorithm',
  40       owner: { '@id': 'sec:owner', '@type': '@id' },
  41       password: 'sec:password',
  42       privateKey: { '@id': 'sec:privateKey', '@type': '@id' },
  43       privateKeyPem: 'sec:privateKeyPem',
  44       publicKey: { '@id': 'sec:publicKey', '@type': '@id' },
  45       publicKeyBase58: 'sec:publicKeyBase58',
  46       publicKeyPem: 'sec:publicKeyPem',
  47       publicKeyWif: 'sec:publicKeyWif',
  48       publicKeyService: { '@id': 'sec:publicKeyService', '@type': '@id' },
  49       revoked: { '@id': 'sec:revoked', '@type': 'xsd:dateTime' },
  50       salt: 'sec:salt',
  51       signature: 'sec:signature',
  52       signatureAlgorithm: 'sec:signingAlgorithm',
  53       signatureValue: 'sec:signatureValue'
  54     }
  55   }
  56 }
  57
  58 const nodeDocumentLoader = jsonld.documentLoaders.node()
  59
  60 const lru = new AsyncLRU({
  61   max: 10,
  62   load: (url, cb) => {
  63     if (CACHE[url] !== undefined) {
  64       logger.debug('Using cache for JSON-LD %s.', url)
  65
  66       return cb(null, {
  67         contextUrl: null,
  68         document: CACHE[url],
  69         documentUrl: url
  70       })
  71     }
  72
  73     nodeDocumentLoader(url)
  74       .then(value => cb(null, value))
  75       .catch(err => cb(err))
  76   }
  77 })
  78
  79 jsonld.documentLoader = (url) => {
  80   return new Promise((res, rej) => {
  81     lru.get(url, (err, value) => {
  82       if (err) return rej(err)
  83
  84       return res(value)
  85     })
  86   })
  87 }
  88
  89 export { jsonld }