{"ast":null,"code":"'use strict';\n\nvar crypto = require('crypto');\n\nfunction randomString(size) {\n  var bits = (size + 1) * 6;\n  var buffer = crypto.randomBytes(Math.ceil(bits / 8));\n  var string = buffer.toString('base64').replace(/\\+/g, '-').replace(/\\//g, '_').replace(/=/g, '');\n  return string.slice(0, size);\n}\n\nfunction calculatePayloadHash(payload, algorithm, contentType) {\n  var hash = crypto.createHash(algorithm);\n  hash.update('hawk.1.payload\\n');\n  hash.update((contentType ? contentType.split(';')[0].trim().toLowerCase() : '') + '\\n');\n  hash.update(payload || '');\n  hash.update('\\n');\n  return hash.digest('base64');\n}\n\nexports.calculateMac = function (credentials, opts) {\n  var normalized = 'hawk.1.header\\n' + opts.ts + '\\n' + opts.nonce + '\\n' + (opts.method || '').toUpperCase() + '\\n' + opts.resource + '\\n' + opts.host.toLowerCase() + '\\n' + opts.port + '\\n' + (opts.hash || '') + '\\n';\n\n  if (opts.ext) {\n    normalized = normalized + opts.ext.replace('\\\\', '\\\\\\\\').replace('\\n', '\\\\n');\n  }\n\n  normalized = normalized + '\\n';\n\n  if (opts.app) {\n    normalized = normalized + opts.app + '\\n' + (opts.dlg || '') + '\\n';\n  }\n\n  var hmac = crypto.createHmac(credentials.algorithm, credentials.key).update(normalized);\n  var digest = hmac.digest('base64');\n  return digest;\n};\n\nexports.header = function (uri, method, opts) {\n  var timestamp = opts.timestamp || Math.floor((Date.now() + (opts.localtimeOffsetMsec || 0)) / 1000);\n  var credentials = opts.credentials;\n\n  if (!credentials || !credentials.id || !credentials.key || !credentials.algorithm) {\n    return '';\n  }\n\n  if (['sha1', 'sha256'].indexOf(credentials.algorithm) === -1) {\n    return '';\n  }\n\n  var artifacts = {\n    ts: timestamp,\n    nonce: opts.nonce || randomString(6),\n    method: method,\n    resource: uri.pathname + (uri.search || ''),\n    host: uri.hostname,\n    port: uri.port || (uri.protocol === 'http:' ? 80 : 443),\n    hash: opts.hash,\n    ext: opts.ext,\n    app: opts.app,\n    dlg: opts.dlg\n  };\n\n  if (!artifacts.hash && (opts.payload || opts.payload === '')) {\n    artifacts.hash = calculatePayloadHash(opts.payload, credentials.algorithm, opts.contentType);\n  }\n\n  var mac = exports.calculateMac(credentials, artifacts);\n  var hasExt = artifacts.ext !== null && artifacts.ext !== undefined && artifacts.ext !== '';\n  var header = 'Hawk id=\"' + credentials.id + '\", ts=\"' + artifacts.ts + '\", nonce=\"' + artifacts.nonce + (artifacts.hash ? 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strict'\n\nvar crypto = require('crypto')\n\nfunction randomString (size) {\n  var bits = (size + 1) * 6\n  var buffer = crypto.randomBytes(Math.ceil(bits / 8))\n  var string = buffer.toString('base64').replace(/\\+/g, '-').replace(/\\//g, '_').replace(/=/g, '')\n  return string.slice(0, size)\n}\n\nfunction calculatePayloadHash (payload, algorithm, contentType) {\n  var hash = crypto.createHash(algorithm)\n  hash.update('hawk.1.payload\\n')\n  hash.update((contentType ? contentType.split(';')[0].trim().toLowerCase() : '') + '\\n')\n  hash.update(payload || '')\n  hash.update('\\n')\n  return hash.digest('base64')\n}\n\nexports.calculateMac = function (credentials, opts) {\n  var normalized = 'hawk.1.header\\n' +\n    opts.ts + '\\n' +\n    opts.nonce + '\\n' +\n    (opts.method || '').toUpperCase() + '\\n' +\n    opts.resource + '\\n' +\n    opts.host.toLowerCase() + '\\n' +\n    opts.port + '\\n' +\n    (opts.hash || '') + '\\n'\n\n  if (opts.ext) {\n    normalized = normalized + opts.ext.replace('\\\\', '\\\\\\\\').replace('\\n', '\\\\n')\n  }\n\n  normalized = normalized + '\\n'\n\n  if (opts.app) {\n    normalized = normalized + opts.app + '\\n' + (opts.dlg || '') + '\\n'\n  }\n\n  var hmac = crypto.createHmac(credentials.algorithm, credentials.key).update(normalized)\n  var digest = hmac.digest('base64')\n  return digest\n}\n\nexports.header = function (uri, method, opts) {\n  var timestamp = opts.timestamp || Math.floor((Date.now() + (opts.localtimeOffsetMsec || 0)) / 1000)\n  var credentials = opts.credentials\n  if (!credentials || !credentials.id || !credentials.key || !credentials.algorithm) {\n    return ''\n  }\n\n  if (['sha1', 'sha256'].indexOf(credentials.algorithm) === -1) {\n    return ''\n  }\n\n  var artifacts = {\n    ts: timestamp,\n    nonce: opts.nonce || randomString(6),\n    method: method,\n    resource: uri.pathname + (uri.search || ''),\n    host: uri.hostname,\n    port: uri.port || (uri.protocol === 'http:' ? 80 : 443),\n    hash: 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