"use strict";

// Helper functions for accessing the Facebook Graph API.
const Parse = require('parse/node').Parse;
const crypto = require('crypto');
const jwksClient = require('jwks-rsa');
const jwt = require('jsonwebtoken');
const httpsRequest = require('./httpsRequest');
const authUtils = require('./utils');
const TOKEN_ISSUER = 'https://www.facebook.com';
function getAppSecretPath(authData, options = {}) {
  const appSecret = options.appSecret;
  if (!appSecret) {
    return '';
  }
  const appsecret_proof = crypto.createHmac('sha256', appSecret).update(authData.access_token).digest('hex');
  return `&appsecret_proof=${appsecret_proof}`;
}
function validateGraphToken(authData, options) {
  return graphRequest('me?fields=id&access_token=' + authData.access_token + getAppSecretPath(authData, options)).then(data => {
    if (data && data.id == authData.id || process.env.TESTING && authData.id === 'test') {
      return;
    }
    throw new Parse.Error(Parse.Error.OBJECT_NOT_FOUND, 'Facebook auth is invalid for this user.');
  });
}
async function validateGraphAppId(appIds, authData, options) {
  var access_token = authData.access_token;
  if (process.env.TESTING && access_token === 'test') {
    return;
  }
  if (!Array.isArray(appIds)) {
    throw new Parse.Error(Parse.Error.OBJECT_NOT_FOUND, 'appIds must be an array.');
  }
  if (!appIds.length) {
    throw new Parse.Error(Parse.Error.OBJECT_NOT_FOUND, 'Facebook auth is not configured.');
  }
  const data = await graphRequest(`app?access_token=${access_token}${getAppSecretPath(authData, options)}`);
  if (!data || !appIds.includes(data.id)) {
    throw new Parse.Error(Parse.Error.OBJECT_NOT_FOUND, 'Facebook auth is invalid for this user.');
  }
}
const getFacebookKeyByKeyId = async (keyId, cacheMaxEntries, cacheMaxAge) => {
  const client = jwksClient({
    jwksUri: `${TOKEN_ISSUER}/.well-known/oauth/openid/jwks/`,
    cache: true,
    cacheMaxEntries,
    cacheMaxAge
  });
  let key;
  try {
    key = await authUtils.getSigningKey(client, keyId);
  } catch (error) {
    throw new Parse.Error(Parse.Error.OBJECT_NOT_FOUND, `Unable to find matching key for Key ID: ${keyId}`);
  }
  return key;
};
const verifyIdToken = async ({
  token,
  id
}, {
  clientId,
  cacheMaxEntries,
  cacheMaxAge
}) => {
  if (!token) {
    throw new Parse.Error(Parse.Error.OBJECT_NOT_FOUND, 'id token is invalid for this user.');
  }
  const {
    kid: keyId,
    alg: algorithm
  } = authUtils.getHeaderFromToken(token);
  const ONE_HOUR_IN_MS = 3600000;
  let jwtClaims;
  cacheMaxAge = cacheMaxAge || ONE_HOUR_IN_MS;
  cacheMaxEntries = cacheMaxEntries || 5;
  const facebookKey = await getFacebookKeyByKeyId(keyId, cacheMaxEntries, cacheMaxAge);
  const signingKey = facebookKey.publicKey || facebookKey.rsaPublicKey;
  try {
    jwtClaims = jwt.verify(token, signingKey, {
      algorithms: algorithm,
      // the audience can be checked against a string, a regular expression or a list of strings and/or regular expressions.
      audience: clientId
    });
  } catch (exception) {
    const message = exception.message;
    throw new Parse.Error(Parse.Error.OBJECT_NOT_FOUND, `${message}`);
  }
  if (jwtClaims.iss !== TOKEN_ISSUER) {
    throw new Parse.Error(Parse.Error.OBJECT_NOT_FOUND, `id token not issued by correct OpenID provider - expected: ${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.');
  }
  return jwtClaims;
};

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

// Returns a promise that fulfills iff this app id is valid.
function validateAppId(appIds, authData, options) {
  if (authData.token) {
    return Promise.resolve();
  } else {
    return validateGraphAppId(appIds, authData, options);
  }
}

// A promisey wrapper for FB graph requests.
function graphRequest(path) {
  return httpsRequest.get('https://graph.facebook.com/' + path);
}
module.exports = {
  validateAppId: validateAppId,
  validateAuthData: validateAuthData
};
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accessing the Facebook Graph API.\nconst Parse = require('parse/node').Parse;\nconst crypto = require('crypto');\nconst jwksClient = require('jwks-rsa');\nconst jwt = require('jsonwebtoken');\nconst httpsRequest = require('./httpsRequest');\nconst authUtils = require('./utils');\n\nconst TOKEN_ISSUER = 'https://www.facebook.com';\n\nfunction getAppSecretPath(authData, options = {}) {\n  const appSecret = options.appSecret;\n  if (!appSecret) {\n    return '';\n  }\n  const appsecret_proof = crypto\n    .createHmac('sha256', appSecret)\n    .update(authData.access_token)\n    .digest('hex');\n\n  return `&appsecret_proof=${appsecret_proof}`;\n}\n\nfunction validateGraphToken(authData, options) {\n  return graphRequest(\n    'me?fields=id&access_token=' + authData.access_token + getAppSecretPath(authData, options)\n  ).then(data => {\n    if ((data && data.id == authData.id) || (process.env.TESTING && authData.id === 'test')) {\n      return;\n    }\n    throw new Parse.Error(Parse.Error.OBJECT_NOT_FOUND, 'Facebook auth is invalid for this user.');\n  });\n}\n\nasync function validateGraphAppId(appIds, authData, options) {\n  var access_token = authData.access_token;\n  if (process.env.TESTING && access_token === 'test') {\n    return;\n  }\n  if (!Array.isArray(appIds)) {\n    throw new Parse.Error(Parse.Error.OBJECT_NOT_FOUND, 'appIds must be an array.');\n  }\n  if (!appIds.length) {\n    throw new Parse.Error(Parse.Error.OBJECT_NOT_FOUND, 'Facebook auth is not configured.');\n  }\n  const data = await graphRequest(\n    `app?access_token=${access_token}${getAppSecretPath(authData, options)}`\n  );\n  if (!data || !appIds.includes(data.id)) {\n    throw new Parse.Error(Parse.Error.OBJECT_NOT_FOUND, 'Facebook auth is invalid for this user.');\n  }\n}\n\nconst getFacebookKeyByKeyId = async (keyId, cacheMaxEntries, cacheMaxAge) => {\n  const client = jwksClient({\n    jwksUri: `${TOKEN_ISSUER}/.well-known/oauth/openid/jwks/`,\n    cache: true,\n    cacheMaxEntries,\n    cacheMaxAge,\n  });\n\n  let key;\n  try {\n    key = await authUtils.getSigningKey(client, keyId);\n  } catch (error) {\n    throw new Parse.Error(\n      Parse.Error.OBJECT_NOT_FOUND,\n      `Unable to find matching key for Key ID: ${keyId}`\n    );\n  }\n  return key;\n};\n\nconst verifyIdToken = async ({ token, id }, { clientId, cacheMaxEntries, cacheMaxAge }) => {\n  if (!token) {\n    throw new Parse.Error(Parse.Error.OBJECT_NOT_FOUND, 'id token is invalid for this user.');\n  }\n\n  const { kid: keyId, alg: algorithm } = authUtils.getHeaderFromToken(token);\n  const ONE_HOUR_IN_MS = 3600000;\n  let jwtClaims;\n\n  cacheMaxAge = cacheMaxAge || ONE_HOUR_IN_MS;\n  cacheMaxEntries = cacheMaxEntries || 5;\n\n  const facebookKey = await getFacebookKeyByKeyId(keyId, cacheMaxEntries, cacheMaxAge);\n  const signingKey = facebookKey.publicKey || facebookKey.rsaPublicKey;\n\n  try {\n    jwtClaims = jwt.verify(token, signingKey, {\n      algorithms: algorithm,\n      // the audience can be checked against a string, a regular expression or a list of strings and/or regular expressions.\n      audience: clientId,\n    });\n  } catch (exception) {\n    const message = exception.message;\n\n    throw new Parse.Error(Parse.Error.OBJECT_NOT_FOUND, `${message}`);\n  }\n\n  if (jwtClaims.iss !== TOKEN_ISSUER) {\n    throw new Parse.Error(\n      Parse.Error.OBJECT_NOT_FOUND,\n      `id token not issued by correct OpenID provider - expected: ${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  return jwtClaims;\n};\n\n// Returns a promise that fulfills iff this user id is valid.\nfunction validateAuthData(authData, options) {\n  if (authData.token) {\n    return verifyIdToken(authData, options);\n  } else {\n    return validateGraphToken(authData, options);\n  }\n}\n\n// Returns a promise that fulfills iff this app id 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