cryptstorage.js 7.33 KB
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/*jslint indent: 2, maxlen: 80, sloppy: true, nomen: true */
/*global jIO: true, sjcl: true, $: true, setTimeout: true */
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jIO.addStorageType('crypt', function (spec, my) {
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  spec = spec || {};
  var that = my.basicStorage(spec, my),
    priv = {},
    is_valid_storage = (spec.storage ? true : false),
    super_serialized = that.serialized;
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  priv.username = spec.username || '';
  priv.password = spec.password || '';
  priv.sub_storage_spec = spec.storage || {
    type: 'base'
  };
  priv.sub_storage_string = JSON.stringify(priv.sub_storage_string);
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  that.serialized = function () {
    var o = super_serialized();
    o.username = priv.username;
    o.password = priv.password; // TODO : unsecured !!!
    o.storage = priv.sub_storage_string;
    return o;
  };
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  that.validateState = function () {
    if (priv.username && is_valid_storage) {
      return '';
    }
    return 'Need at least two parameters: "username" and "storage".';
  };
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  // TODO : IT IS NOT SECURE AT ALL!
  // WE MUST REWORK CRYPTED STORAGE!
  priv.encrypt_param_object = {
    "iv": "kaprWwY/Ucr7pumXoTHbpA",
    "v": 1,
    "iter": 1000,
    "ks": 256,
    "ts": 128,
    "mode": "ccm",
    "adata": "",
    "cipher": "aes",
    "salt": "K4bmZG9d704"
  };
  priv.decrypt_param_object = {
    "iv": "kaprWwY/Ucr7pumXoTHbpA",
    "ks": 256,
    "ts": 128,
    "salt": "K4bmZG9d704"
  };
  priv.encrypt = function (data, callback) {
    // end with a callback in order to improve encrypt to an
    // asynchronous encryption.
    var tmp = sjcl.encrypt(priv.username + ':' + priv.password, data,
      priv.encrypt_param_object);
    callback(JSON.parse(tmp).ct);
  };
  priv.decrypt = function (data, callback) {
    var tmp, param = $.extend(true, {}, priv.decrypt_param_object);
    param.ct = data || '';
    param = JSON.stringify(param);
    try {
      tmp = sjcl.decrypt(priv.username + ':' + priv.password, param);
    } catch (e) {
      callback({
        status: 403,
        statusText: 'Forbidden',
        error: 'forbidden',
        message: 'Unable to decrypt.',
        reason: 'unable to decrypt'
      });
      return;
    }
    callback(undefined, tmp);
  };
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  priv.newAsyncModule = function () {
    var async = {};
    async.call = function (obj, function_name, arglist) {
      obj._wait = obj._wait || {};
      if (obj._wait[function_name]) {
        obj._wait[function_name] -= 1;
        return function () {};
      }
      // ok if undef or 0
      arglist = arglist || [];
      setTimeout(function () {
        obj[function_name].apply(obj[function_name], arglist);
      });
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    };
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    async.neverCall = function (obj, function_name) {
      obj._wait = obj._wait || {};
      obj._wait[function_name] = -1;
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    };
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    async.wait = function (obj, function_name, times) {
      obj._wait = obj._wait || {};
      obj._wait[function_name] = times;
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    };
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    async.end = function () {
      async.call = function () {};
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    };
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    return async;
  };
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  that.post = function (command) {
    that.put(command);
  };

  /**
   * Saves a document.
   * @method put
   */
  that.put = function (command) {
    var new_file_name, new_file_content, am = priv.newAsyncModule(),
      o = {};
    o.encryptFilePath = function () {
      priv.encrypt(command.getDocId(), function (res) {
        new_file_name = res;
        am.call(o, 'save');
      });
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    };
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    o.encryptFileContent = function () {
      priv.encrypt(command.getDocContent(), function (res) {
        new_file_content = res;
        am.call(o, 'save');
      });
    };
    o.save = function () {
      var success = function (val) {
        val.id = command.getDocId();
        that.success(val);
      },
        error = function (err) {
          that.error(err);
        },
        cloned_doc = command.cloneDoc();
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      cloned_doc._id = new_file_name;
      cloned_doc.content = new_file_content;
      that.addJob('put', priv.sub_storage_spec, cloned_doc,
        command.cloneOption(), success, error);
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    };
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    am.wait(o, 'save', 1);
    am.call(o, 'encryptFilePath');
    am.call(o, 'encryptFileContent');
  }; // end put
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  /**
   * Loads a document.
   * @method get
   */
  that.get = function (command) {
    var new_file_name, am = priv.newAsyncModule(),
      o = {};
    o.encryptFilePath = function () {
      priv.encrypt(command.getDocId(), function (res) {
        new_file_name = res;
        am.call(o, 'get');
      });
    };
    o.get = function () {
      that.addJob('get', priv.sub_storage_spec, new_file_name,
        command.cloneOption(), o.success, o.error);
    };
    o.success = function (val) {
      val._id = command.getDocId();
      if (command.getOption('metadata_only')) {
        that.success(val);
      } else {
        priv.decrypt(val.content, function (err, res) {
          if (err) {
            that.error(err);
          } else {
            val.content = res;
            that.success(val);
          }
        });
      }
    };
    o.error = function (error) {
      that.error(error);
    };
    am.call(o, 'encryptFilePath');
  }; // end get
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  /**
   * Gets a document list.
   * @method allDocs
   */
  that.allDocs = function (command) {
    var result_array = [],
      am = priv.newAsyncModule(),
      o = {};
    o.allDocs = function () {
      that.addJob('allDocs', priv.sub_storage_spec, null,
        command.cloneOption(), o.onSuccess, o.error);
    };
    o.onSuccess = function (val) {
      if (val.total_rows === 0) {
        return am.call(o, 'success');
      }
      result_array = val.rows;
      var i, decrypt = function (c) {
        priv.decrypt(result_array[c].id, function (err, res) {
          if (err) {
            am.call(o, 'error', [err]);
          } else {
            result_array[c].id = res;
            result_array[c].key = res;
            am.call(o, 'success');
          }
        });
        if (!command.getOption('metadata_only')) {
          priv.decrypt(
            result_array[c].value.content,
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            function (err, res) {
              if (err) {
                am.call(o, 'error', [err]);
              } else {
                result_array[c].value.content = res;
                am.call(o, 'success');
              }
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            }
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          );
        }
      };
      if (command.getOption('metadata_only')) {
        am.wait(o, 'success', val.total_rows - 1);
      } else {
        am.wait(o, 'success', val.total_rows * 2 - 1);
      }
      for (i = 0; i < result_array.length; i += 1) {
        decrypt(i);
      }
    };
    o.error = function (error) {
      am.end();
      that.error(error);
    };
    o.success = function () {
      am.end();
      that.success({
        total_rows: result_array.length,
        rows: result_array
      });
    };
    am.call(o, 'allDocs');
  }; // end allDocs
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  /**
   * Removes a document.
   * @method remove
   */
  that.remove = function (command) {
    var new_file_name, o = {};
    o.encryptDocId = function () {
      priv.encrypt(command.getDocId(), function (res) {
        new_file_name = res;
        o.removeDocument();
      });
    };
    o.removeDocument = function () {
      var cloned_doc = command.cloneDoc();
      cloned_doc._id = new_file_name;
      that.addJob('remove', priv.sub_storage_spec, cloned_doc,
        command.cloneOption(), o.success, that.error);
    };
    o.success = function (val) {
      val.id = command.getDocId();
      that.success(val);
    };
    o.encryptDocId();
  }; // end remove
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  return that;
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});