static createWithSigningFunction()

in common/core/src/shared_access_signature.ts [123:156]

• 24 lines of code
• 8 McCabe index (conditional complexity)

static createWithSigningFunction(credentials: authorization.TransportConfig, expiry: number, signingFunction: (stringToSign: any, callback: Callback<any>) => void, callback: (err: Error, sas?: SharedAccessSignature) => void): void {
  function throwRef(name: string, value: any): void {
    throw new ReferenceError('Argument \'' + name + '\' is ' + value);
  }

  /*Codes_SRS_NODE_COMMON_SAS_06_001: [If `credentials`, `expiry`, `signingFunction`, or `callback` are falsy, `createWithSigningFunction` shall throw `ReferenceError`.] */
  if (!credentials) throwRef('credentials', credentials);
  if (!expiry) throwRef('expiry', expiry);
  if (!signingFunction) throwRef('signingFunction', signingFunction);
  if (!callback) throwRef('callback', callback);
  const sas = new SharedAccessSignature();
  /*Codes_SRS_NODE_COMMON_SAS_06_002: [The `createWithSigningFunction` shall create a `SharedAccessSignature` object with an `sr` property formed by url encoding `credentials.host` + `/devices/` + `credentials.deviceId` + `/modules/` + `credentials.moduleId`.] */
  let resource = credentials.host + '/devices/' + credentials.deviceId;
  if (credentials.moduleId) {
    resource += `/modules/${credentials.moduleId}`;
  }
  sas.sr = authorization.encodeUriComponentStrict(resource);
  /*Codes_SRS_NODE_COMMON_SAS_06_003: [** The `createWithSigningFunction` shall create a `SharedAccessSignature` object with an `se` property containing the value of the parameter `expiry`.] */
  sas.se = expiry;
  /*Codes_SRS_NODE_COMMON_SAS_06_004: [The `createWithSigningFunction` shall create a `SharedAccessSignature` object with an optional property `skn`, if the `credentials.sharedAccessKeyName` is not falsy,  The value of the `skn` property will be the url encoded value of `credentials.sharedAccessKeyName`.] */
  if (credentials.sharedAccessKeyName) {
    sas.skn = authorization.encodeUriComponentStrict(credentials.sharedAccessKeyName);
  }
  signingFunction(Buffer.from(authorization.stringToSign(sas.sr, sas.se.toString())), (err, signed) => {
    if (err) {
      /*Codes_SRS_NODE_COMMON_SAS_06_006: [** The `createWithSigningFunction` will invoke the `callback` function with an error value if an error occurred during the signing. **] */
      callback(err);
    } else {
      /*Codes_SRS_NODE_COMMON_SAS_06_005: [The `createWithSigningFunction` shall create a `SharedAccessSignature` object with a `sig` property with the SHA256 hash of the string sr + `\n` + se.  The `sig` value will first be base64 encoded THEN url encoded.] */
      sas.sig = authorization.encodeUriComponentStrict(signed.toString('base64'));
      callback(null, sas);
    }
  });
}