1 files changed, 202 insertions, 0 deletions

diff --git a/helpers/utils.js b/helpers/utils.js
new file mode 100644
index 000000000..7cdb2600d
--- /dev/null
+++ b/helpers/utils.js
@@ -0,0 +1,202 @@
+;(function () {
+  'use strict'
+
+  var async = require('async')
+  var config = require('config')
+  var crypto = require('crypto')
+  var fs = require('fs')
+  var openssl = require('openssl-wrapper')
+  var request = require('request')
+  var replay = require('request-replay')
+  var ursa = require('ursa')
+
+  var constants = require('../initializers/constants')
+  var logger = require('./logger')
+
+  var utils = {}
+
+  var http = config.get('webserver.https') ? 'https' : 'http'
+  var host = config.get('webserver.host')
+  var port = config.get('webserver.port')
+  var algorithm = 'aes-256-ctr'
+
+  // ----------- Private functions ----------
+
+  function makeRetryRequest (params, from_url, to_pod, signature, callbackEach) {
+    // Append the signature
+    if (signature) {
+      params.json.signature = {
+        url: from_url,
+        signature: signature
+      }
+    }
+
+    logger.debug('Make retry requests to %s.', to_pod.url)
+
+    replay(
+      request.post(params, function (err, response, body) {
+        callbackEach(err, response, body, params.url, to_pod)
+      }),
+      {
+        retries: constants.REQUEST_RETRIES,
+        factor: 3,
+        maxTimeout: Infinity,
+        errorCodes: [ 'EADDRINFO', 'ETIMEDOUT', 'ECONNRESET', 'ESOCKETTIMEDOUT', 'ENOTFOUND', 'ECONNREFUSED' ]
+      }
+    ).on('replay', function (replay) {
+      logger.info('Replaying request to %s. Request failed: %d %s. Replay number: #%d. Will retry in: %d ms.',
+        params.url, replay.error.code, replay.error.message, replay.number, replay.delay)
+    })
+  }
+
+  // ----------- Public attributes ----------
+  utils.certDir = __dirname + '/../' + config.get('storage.certs')
+
+  // { path, data }
+  utils.makeMultipleRetryRequest = function (all_data, pods, callbackEach, callback) {
+    if (!callback) {
+      callback = callbackEach
+      callbackEach = null
+    }
+
+    var url = http + '://' + host + ':' + port
+    var signature
+
+    // Add signature if it is specified in the params
+    if (all_data.method === 'POST' && all_data.data && all_data.sign === true) {
+      var myKey = ursa.createPrivateKey(fs.readFileSync(utils.certDir + 'peertube.key.pem'))
+      signature = myKey.hashAndSign('sha256', url, 'utf8', 'hex')
+    }
+
+    // Make a request for each pod
+    async.each(pods, function (pod, callback_each_async) {
+      function callbackEachRetryRequest (err, response, body, url, pod) {
+        if (callbackEach !== null) {
+          callbackEach(err, response, body, url, pod, function () {
+            callback_each_async()
+          })
+        } else {
+          callback_each_async()
+        }
+      }
+
+      var params = {
+        url: pod.url + all_data.path,
+        method: all_data.method
+      }
+
+      // Add data with POST requst ?
+      if (all_data.method === 'POST' && all_data.data) {
+        // Encrypt data ?
+        if (all_data.encrypt === true) {
+          var crt = ursa.createPublicKey(pod.publicKey)
+
+          // TODO: ES6 with let
+          ;(function (crt_copy, copy_params, copy_url, copy_pod, copy_signature) {
+            utils.symetricEncrypt(JSON.stringify(all_data.data), function (err, dataEncrypted) {
+              if (err) throw err
+
+              var passwordEncrypted = crt_copy.encrypt(dataEncrypted.password, 'utf8', 'hex')
+              copy_params.json = {
+                data: dataEncrypted.crypted,
+                key: passwordEncrypted
+              }
+
+              makeRetryRequest(copy_params, copy_url, copy_pod, copy_signature, callbackEachRetryRequest)
+            })
+          })(crt, params, url, pod, signature)
+        } else {
+          params.json = { data: all_data.data }
+          makeRetryRequest(params, url, pod, signature, callbackEachRetryRequest)
+        }
+      } else {
+        makeRetryRequest(params, url, pod, signature, callbackEachRetryRequest)
+      }
+    }, callback)
+  }
+
+  utils.certsExist = function (callback) {
+    fs.exists(utils.certDir + 'peertube.key.pem', function (exists) {
+      return callback(exists)
+    })
+  }
+
+  utils.createCerts = function (callback) {
+    utils.certsExist(function (exist) {
+      if (exist === true) {
+        var string = 'Certs already exist.'
+        logger.warning(string)
+        return callback(new Error(string))
+      }
+
+      logger.info('Generating a RSA key...')
+      openssl.exec('genrsa', { 'out': utils.certDir + 'peertube.key.pem', '2048': false }, function (err) {
+        if (err) {
+          logger.error('Cannot create private key on this pod.', { error: err })
+          return callback(err)
+        }
+        logger.info('RSA key generated.')
+
+        logger.info('Manage public key...')
+        openssl.exec('rsa', { 'in': utils.certDir + 'peertube.key.pem', 'pubout': true, 'out': utils.certDir + 'peertube.pub' }, function (err) {
+          if (err) {
+            logger.error('Cannot create public key on this pod .', { error: err })
+            return callback(err)
+          }
+
+          logger.info('Public key managed.')
+          return callback(null)
+        })
+      })
+    })
+  }
+
+  utils.createCertsIfNotExist = function (callback) {
+    utils.certsExist(function (exist) {
+      if (exist === true) {
+        return callback(null)
+      }
+
+      utils.createCerts(function (err) {
+        return callback(err)
+      })
+    })
+  }
+
+  utils.generatePassword = function (callback) {
+    crypto.randomBytes(32, function (err, buf) {
+      if (err) {
+        return callback(err)
+      }
+
+      callback(null, buf.toString('utf8'))
+    })
+  }
+
+  utils.symetricEncrypt = function (text, callback) {
+    utils.generatePassword(function (err, password) {
+      if (err) {
+        return callback(err)
+      }
+
+      var cipher = crypto.createCipher(algorithm, password)
+      var crypted = cipher.update(text, 'utf8', 'hex')
+      crypted += cipher.final('hex')
+      callback(null, { crypted: crypted, password: password })
+    })
+  }
+
+  utils.symetricDecrypt = function (text, password) {
+    var decipher = crypto.createDecipher(algorithm, password)
+    var dec = decipher.update(text, 'hex', 'utf8')
+    dec += decipher.final('utf8')
+    return dec
+  }
+
+  utils.cleanForExit = function (webtorrent_process) {
+    logger.info('Gracefully exiting')
+    process.kill(-webtorrent_process.pid)
+  }
+
+  module.exports = utils
+})()