'use strict';

// Helper functions for accessing the google API.
var Parse = require('parse/node').Parse;
const https = require('https');
const jwt = require('jsonwebtoken');
const authUtils = require('./utils');
const TOKEN_ISSUER = 'accounts.google.com';
const HTTPS_TOKEN_ISSUER = 'https://accounts.google.com';
let cache = {};

// Retrieve Google Signin Keys (with cache control)
function getGoogleKeyByKeyId(keyId) {
  if (cache[keyId] && cache.expiresAt > new Date()) {
    return cache[keyId];
  }
  return new Promise((resolve, reject) => {
    https.get(`https://www.googleapis.com/oauth2/v3/certs`, res => {
      let data = '';
      res.on('data', chunk => {
        data += chunk.toString('utf8');
      });
      res.on('end', () => {
        const {
          keys
        } = JSON.parse(data);
        const pems = keys.reduce((pems, {
          n: modulus,
          e: exposant,
          kid
        }) => Object.assign(pems, {
          [kid]: rsaPublicKeyToPEM(modulus, exposant)
        }), {});
        if (res.headers['cache-control']) {
          var expire = res.headers['cache-control'].match(/max-age=([0-9]+)/);
          if (expire) {
            cache = Object.assign({}, pems, {
              expiresAt: new Date(new Date().getTime() + Number(expire[1]) * 1000)
            });
          }
        }
        resolve(pems[keyId]);
      });
    }).on('error', reject);
  });
}
async function verifyIdToken({
  id_token: token,
  id
}, {
  clientId
}) {
  if (!token) {
    throw new Parse.Error(Parse.Error.OBJECT_NOT_FOUND, `id token is invalid for this user.`);
  }
  const {
    kid: keyId,
    alg: algorithm
  } = authUtils.getHeaderFromToken(token);
  let jwtClaims;
  const googleKey = await getGoogleKeyByKeyId(keyId);
  try {
    jwtClaims = jwt.verify(token, googleKey, {
      algorithms: algorithm,
      audience: clientId
    });
  } catch (exception) {
    const message = exception.message;
    throw new Parse.Error(Parse.Error.OBJECT_NOT_FOUND, `${message}`);
  }
  if (jwtClaims.iss !== TOKEN_ISSUER && jwtClaims.iss !== HTTPS_TOKEN_ISSUER) {
    throw new Parse.Error(Parse.Error.OBJECT_NOT_FOUND, `id token not issued by correct provider - expected: ${TOKEN_ISSUER} or ${HTTPS_TOKEN_ISSUER} | from: ${jwtClaims.iss}`);
  }
  if (jwtClaims.sub !== id) {
    throw new Parse.Error(Parse.Error.OBJECT_NOT_FOUND, `auth data is invalid for this user.`);
  }
  if (clientId && jwtClaims.aud !== clientId) {
    throw new Parse.Error(Parse.Error.OBJECT_NOT_FOUND, `id token not authorized for this clientId.`);
  }
  return jwtClaims;
}

// Returns a promise that fulfills if this user id is valid.
function validateAuthData(authData, options = {}) {
  return verifyIdToken(authData, options);
}

// Returns a promise that fulfills if this app id is valid.
function validateAppId() {
  return Promise.resolve();
}
module.exports = {
  validateAppId: validateAppId,
  validateAuthData: validateAuthData
};

// Helpers functions to convert the RSA certs to PEM (from jwks-rsa)
function rsaPublicKeyToPEM(modulusB64, exponentB64) {
  const modulus = new Buffer(modulusB64, 'base64');
  const exponent = new Buffer(exponentB64, 'base64');
  const modulusHex = prepadSigned(modulus.toString('hex'));
  const exponentHex = prepadSigned(exponent.toString('hex'));
  const modlen = modulusHex.length / 2;
  const explen = exponentHex.length / 2;
  const encodedModlen = encodeLengthHex(modlen);
  const encodedExplen = encodeLengthHex(explen);
  const encodedPubkey = '30' + encodeLengthHex(modlen + explen + encodedModlen.length / 2 + encodedExplen.length / 2 + 2) + '02' + encodedModlen + modulusHex + '02' + encodedExplen + exponentHex;
  const der = new Buffer(encodedPubkey, 'hex').toString('base64');
  let pem = '-----BEGIN RSA PUBLIC KEY-----\n';
  pem += `${der.match(/.{1,64}/g).join('\n')}`;
  pem += '\n-----END RSA PUBLIC KEY-----\n';
  return pem;
}
function prepadSigned(hexStr) {
  const msb = hexStr[0];
  if (msb < '0' || msb > '7') {
    return `00${hexStr}`;
  }
  return hexStr;
}
function toHex(number) {
  const nstr = number.toString(16);
  if (nstr.length % 2) {
    return `0${nstr}`;
  }
  return nstr;
}
function encodeLengthHex(n) {
  if (n <= 127) {
    return toHex(n);
  }
  const nHex = toHex(n);
  const lengthOfLengthByte = 128 + nHex.length / 2;
  return toHex(lengthOfLengthByte) + nHex;
}
//# sourceMappingURL=data:application/json;charset=utf-8;base64,{"version":3,"names":["Parse","require","https","jwt","authUtils","TOKEN_ISSUER","HTTPS_TOKEN_ISSUER","cache","getGoogleKeyByKeyId","keyId","expiresAt","Date","Promise","resolve","reject","get","res","data","on","chunk","toString","keys","JSON","parse","pems","reduce","n","modulus","e","exposant","kid","Object","assign","rsaPublicKeyToPEM","headers","expire","match","getTime","Number","verifyIdToken","id_token","token","id","clientId","Error","OBJECT_NOT_FOUND","alg","algorithm","getHeaderFromToken","jwtClaims","googleKey","verify","algorithms","audience","exception","message","iss","sub","aud","validateAuthData","authData","options","validateAppId","module","exports","modulusB64","exponentB64","Buffer","exponent","modulusHex","prepadSigned","exponentHex","modlen","length","explen","encodedModlen","encodeLengthHex","encodedExplen","encodedPubkey","der","pem","join","hexStr","msb","toHex","number","nstr","nHex","lengthOfLengthByte"],"sources":["../../../src/Adapters/Auth/google.js"],"sourcesContent":["'use strict';\n\n// Helper functions for accessing the google API.\nvar Parse = require('parse/node').Parse;\n\nconst https = require('https');\nconst jwt = require('jsonwebtoken');\nconst authUtils = require('./utils');\n\nconst TOKEN_ISSUER = 'accounts.google.com';\nconst HTTPS_TOKEN_ISSUER = 'https://accounts.google.com';\n\nlet cache = {};\n\n// Retrieve Google Signin Keys (with cache control)\nfunction getGoogleKeyByKeyId(keyId) {\n  if (cache[keyId] && cache.expiresAt > new Date()) {\n    return cache[keyId];\n  }\n\n  return new Promise((resolve, reject) => {\n    https\n      .get(`https://www.googleapis.com/oauth2/v3/certs`, res => {\n        let data = '';\n        res.on('data', chunk => {\n          data += chunk.toString('utf8');\n        });\n        res.on('end', () => {\n          const { keys } = JSON.parse(data);\n          const pems = keys.reduce(\n            (pems, { n: modulus, e: exposant, kid }) =>\n              Object.assign(pems, {\n                [kid]: rsaPublicKeyToPEM(modulus, exposant),\n              }),\n            {}\n          );\n\n          if (res.headers['cache-control']) {\n            var expire = res.headers['cache-control'].match(/max-age=([0-9]+)/);\n\n            if (expire) {\n              cache = Object.assign({}, pems, {\n                expiresAt: new Date(new Date().getTime() + Number(expire[1]) * 1000),\n              });\n            }\n          }\n\n          resolve(pems[keyId]);\n        });\n      })\n      .on('error', reject);\n  });\n}\n\nasync function verifyIdToken({ id_token: token, id }, { clientId }) {\n  if (!token) {\n    throw new Parse.Error(Parse.Error.OBJECT_NOT_FOUND, `id token is invalid for this user.`);\n  }\n\n  const { kid: keyId, alg: algorithm } = authUtils.getHeaderFromToken(token);\n  let jwtClaims;\n  const googleKey = await getGoogleKeyByKeyId(keyId);\n\n  try {\n    jwtClaims = jwt.verify(token, googleKey, {\n      algorithms: algorithm,\n      audience: clientId,\n    });\n  } catch (exception) {\n    const message = exception.message;\n    throw new Parse.Error(Parse.Error.OBJECT_NOT_FOUND, `${message}`);\n  }\n\n  if (jwtClaims.iss !== TOKEN_ISSUER && jwtClaims.iss !== HTTPS_TOKEN_ISSUER) {\n    throw new Parse.Error(\n      Parse.Error.OBJECT_NOT_FOUND,\n      `id token not issued by correct provider - expected: ${TOKEN_ISSUER} or ${HTTPS_TOKEN_ISSUER} | from: ${jwtClaims.iss}`\n    );\n  }\n\n  if (jwtClaims.sub !== id) {\n    throw new Parse.Error(Parse.Error.OBJECT_NOT_FOUND, `auth data is invalid for this user.`);\n  }\n\n  if (clientId && jwtClaims.aud !== clientId) {\n    throw new Parse.Error(\n      Parse.Error.OBJECT_NOT_FOUND,\n      `id token not authorized for this clientId.`\n    );\n  }\n\n  return jwtClaims;\n}\n\n// Returns a promise that fulfills if this user id is valid.\nfunction validateAuthData(authData, options = {}) {\n  return verifyIdToken(authData, options);\n}\n\n// Returns a promise that fulfills if this app id is valid.\nfunction validateAppId() {\n  return Promise.resolve();\n}\n\nmodule.exports = {\n  validateAppId: validateAppId,\n  validateAuthData: validateAuthData,\n};\n\n// Helpers functions to convert the RSA certs to PEM (from jwks-rsa)\nfunction rsaPublicKeyToPEM(modulusB64, exponentB64) {\n  const modulus = new Buffer(modulusB64, 'base64');\n  const exponent = new Buffer(exponentB64, 'base64');\n  const modulusHex = prepadSigned(modulus.toString('hex'));\n  const exponentHex = prepadSigned(exponent.toString('hex'));\n  const modlen = modulusHex.length / 2;\n  const explen = exponentHex.length / 2;\n\n  const encodedModlen = encodeLengthHex(modlen);\n  const encodedExplen = encodeLengthHex(explen);\n  const encodedPubkey =\n    '30' +\n    encodeLengthHex(modlen + explen + encodedModlen.length / 2 + encodedExplen.length / 2 + 2) +\n    '02' +\n    encodedModlen +\n    modulusHex +\n    '02' +\n    encodedExplen +\n    exponentHex;\n\n  const der = new Buffer(encodedPubkey, 'hex').toString('base64');\n\n  let pem = '-----BEGIN RSA PUBLIC KEY-----\\n';\n  pem += `${der.match(/.{1,64}/g).join('\\n')}`;\n  pem += '\\n-----END RSA PUBLIC KEY-----\\n';\n  return pem;\n}\n\nfunction prepadSigned(hexStr) {\n  const msb = hexStr[0];\n  if (msb < '0' || msb > '7') {\n    return `00${hexStr}`;\n  }\n  return hexStr;\n}\n\nfunction toHex(number) {\n  const nstr = number.toString(16);\n  if (nstr.length % 2) {\n    return `0${nstr}`;\n  }\n  return nstr;\n}\n\nfunction encodeLengthHex(n) {\n  if (n <= 127) {\n    return toHex(n);\n  }\n  const nHex = toHex(n);\n  const lengthOfLengthByte = 128 + nHex.length / 2;\n  return toHex(lengthOfLengthByte) + 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