server/helpers/custom-jsonld-signature.ts

   1 import AsyncLRU from 'async-lru'
   2 import { logger } from './logger'
   3
   4 import jsonld = require('jsonld')
   5
   6 const CACHE = {
   7   'https://w3id.org/security/v1': {
   8     '@context': {
   9       id: '@id',
  10       type: '@type',
  11
  12       dc: 'http://purl.org/dc/terms/',
  13       sec: 'https://w3id.org/security#',
  14       xsd: 'http://www.w3.org/2001/XMLSchema#',
  15
  16       EcdsaKoblitzSignature2016: 'sec:EcdsaKoblitzSignature2016',
  17       Ed25519Signature2018: 'sec:Ed25519Signature2018',
  18       EncryptedMessage: 'sec:EncryptedMessage',
  19       GraphSignature2012: 'sec:GraphSignature2012',
  20       LinkedDataSignature2015: 'sec:LinkedDataSignature2015',
  21       LinkedDataSignature2016: 'sec:LinkedDataSignature2016',
  22       CryptographicKey: 'sec:Key',
  23
  24       authenticationTag: 'sec:authenticationTag',
  25       canonicalizationAlgorithm: 'sec:canonicalizationAlgorithm',
  26       cipherAlgorithm: 'sec:cipherAlgorithm',
  27       cipherData: 'sec:cipherData',
  28       cipherKey: 'sec:cipherKey',
  29       created: { '@id': 'dc:created', '@type': 'xsd:dateTime' },
  30       creator: { '@id': 'dc:creator', '@type': '@id' },
  31       digestAlgorithm: 'sec:digestAlgorithm',
  32       digestValue: 'sec:digestValue',
  33       domain: 'sec:domain',
  34       encryptionKey: 'sec:encryptionKey',
  35       expiration: { '@id': 'sec:expiration', '@type': 'xsd:dateTime' },
  36       expires: { '@id': 'sec:expiration', '@type': 'xsd:dateTime' },
  37       initializationVector: 'sec:initializationVector',
  38       iterationCount: 'sec:iterationCount',
  39       nonce: 'sec:nonce',
  40       normalizationAlgorithm: 'sec:normalizationAlgorithm',
  41       owner: { '@id': 'sec:owner', '@type': '@id' },
  42       password: 'sec:password',
  43       privateKey: { '@id': 'sec:privateKey', '@type': '@id' },
  44       privateKeyPem: 'sec:privateKeyPem',
  45       publicKey: { '@id': 'sec:publicKey', '@type': '@id' },
  46       publicKeyBase58: 'sec:publicKeyBase58',
  47       publicKeyPem: 'sec:publicKeyPem',
  48       publicKeyWif: 'sec:publicKeyWif',
  49       publicKeyService: { '@id': 'sec:publicKeyService', '@type': '@id' },
  50       revoked: { '@id': 'sec:revoked', '@type': 'xsd:dateTime' },
  51       salt: 'sec:salt',
  52       signature: 'sec:signature',
  53       signatureAlgorithm: 'sec:signingAlgorithm',
  54       signatureValue: 'sec:signatureValue'
  55     }
  56   }
  57 }
  58
  59 const nodeDocumentLoader = jsonld.documentLoaders.node()
  60
  61 const lru = new AsyncLRU({
  62   max: 10,
  63   load: (url, cb) => {
  64     if (CACHE[url] !== undefined) {
  65       logger.debug('Using cache for JSON-LD %s.', url)
  66
  67       return cb(null, {
  68         contextUrl: null,
  69         document: CACHE[url],
  70         documentUrl: url
  71       })
  72     }
  73
  74     nodeDocumentLoader(url)
  75       .then(value => cb(null, value))
  76       .catch(err => cb(err))
  77   }
  78 })
  79
  80 /* eslint-disable no-import-assign */
  81 jsonld.documentLoader = (url) => {
  82   return new Promise((res, rej) => {
  83     lru.get(url, (err, value) => {
  84       if (err) return rej(err)
  85
  86       return res(value)
  87     })
  88   })
  89 }
  90
  91 export { jsonld }