rocket.chat.mqtt/node_modules/ejson/index.js

It's a MQTT Server, using redis to scale horizontally.

module.exports = (function () {
"use strict";
var Meteor = { _noYieldsAllowed:function nope(f) { return f(); }};
var EJSON, EJSONTest, i, Base64, root = {};
var _ = require("underscore");
// Base 64 encoding

var BASE_64_CHARS = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

var BASE_64_VALS = {};

for (var i = 0; i < BASE_64_CHARS.length; i++) {
  BASE_64_VALS[BASE_64_CHARS.charAt(i)] = i;
};

Base64 = {};

Base64.encode = function (array) {

  if (typeof array === "string") {
    var str = array;
    array = Base64.newBinary(str.length);
    for (var i = 0; i < str.length; i++) {
      var ch = str.charCodeAt(i);
      if (ch > 0xFF) {
        throw new Error(
          "Not ascii. Base64.encode can only take ascii strings.");
      }
      array[i] = ch;
    }
  }

  var answer = [];
  var a = null;
  var b = null;
  var c = null;
  var d = null;
  for (var i = 0; i < array.length; i++) {
    switch (i % 3) {
    case 0:
      a = (array[i] >> 2) & 0x3F;
      b = (array[i] & 0x03) << 4;
      break;
    case 1:
      b = b | (array[i] >> 4) & 0xF;
      c = (array[i] & 0xF) << 2;
      break;
    case 2:
      c = c | (array[i] >> 6) & 0x03;
      d = array[i] & 0x3F;
      answer.push(getChar(a));
      answer.push(getChar(b));
      answer.push(getChar(c));
      answer.push(getChar(d));
      a = null;
      b = null;
      c = null;
      d = null;
      break;
    }
  }
  if (a != null) {
    answer.push(getChar(a));
    answer.push(getChar(b));
    if (c == null)
      answer.push('=');
    else
      answer.push(getChar(c));
    if (d == null)
      answer.push('=');
  }
  return answer.join("");
};

var getChar = function (val) {
  return BASE_64_CHARS.charAt(val);
};

var getVal = function (ch) {
  if (ch === '=') {
    return -1;
  }
  return BASE_64_VALS[ch];
};

// XXX This is a weird place for this to live, but it's used both by
// this package and 'ejson', and we can't put it in 'ejson' without
// introducing a circular dependency. It should probably be in its own
// package or as a helper in a package that both 'base64' and 'ejson'
// use.
Base64.newBinary = function (len) {
  if (typeof Uint8Array === 'undefined' || typeof ArrayBuffer === 'undefined') {
    var ret = [];
    for (var i = 0; i < len; i++) {
      ret.push(0);
    }
    ret.$Uint8ArrayPolyfill = true;
    return ret;
  }
  return new Uint8Array(new ArrayBuffer(len));
};

Base64.decode = function (str) {
  var len = Math.floor((str.length*3)/4);
  if (str.charAt(str.length - 1) == '=') {
    len--;
    if (str.charAt(str.length - 2) == '=')
      len--;
  }
  var arr = Base64.newBinary(len);

  var one = null;
  var two = null;
  var three = null;

  var j = 0;

  for (var i = 0; i < str.length; i++) {
    var c = str.charAt(i);
    var v = getVal(c);
    switch (i % 4) {
    case 0:
      if (v < 0)
        throw new Error('invalid base64 string');
      one = v << 2;
      break;
    case 1:
      if (v < 0)
        throw new Error('invalid base64 string');
      one = one | (v >> 4);
      arr[j++] = one;
      two = (v & 0x0F) << 4;
      break;
    case 2:
      if (v >= 0) {
        two = two | (v >> 2);
        arr[j++] = two;
        three = (v & 0x03) << 6;
      }
      break;
    case 3:
      if (v >= 0) {
        arr[j++] = three | v;
      }
      break;
    }
  }
  return arr;
};

/**
 * @namespace
 * @summary Namespace for EJSON functions
 */
EJSON = {};
EJSONTest = {};



// Custom type interface definition
/**
 * @class CustomType
 * @instanceName customType
 * @memberOf EJSON
 * @summary The interface that a class must satisfy to be able to become an
 * EJSON custom type via EJSON.addType.
 */

/**
 * @function typeName
 * @memberOf EJSON.CustomType
 * @summary Return the tag used to identify this type.  This must match the tag used to register this type with [`EJSON.addType`](#ejson_add_type).
 * @locus Anywhere
 * @instance
 */

/**
 * @function toJSONValue
 * @memberOf EJSON.CustomType
 * @summary Serialize this instance into a JSON-compatible value.
 * @locus Anywhere
 * @instance
 */

/**
 * @function clone
 * @memberOf EJSON.CustomType
 * @summary Return a value `r` such that `this.equals(r)` is true, and modifications to `r` do not affect `this` and vice versa.
 * @locus Anywhere
 * @instance
 */

/**
 * @function equals
 * @memberOf EJSON.CustomType
 * @summary Return `true` if `other` has a value equal to `this`; `false` otherwise.
 * @locus Anywhere
 * @param {Object} other Another object to compare this to.
 * @instance
 */


var customTypes = {};
// Add a custom type, using a method of your choice to get to and
// from a basic JSON-able representation.  The factory argument
// is a function of JSON-able --> your object
// The type you add must have:
// - A toJSONValue() method, so that Meteor can serialize it
// - a typeName() method, to show how to look it up in our type table.
// It is okay if these methods are monkey-patched on.
// EJSON.clone will use toJSONValue and the given factory to produce
// a clone, but you may specify a method clone() that will be
// used instead.
// Similarly, EJSON.equals will use toJSONValue to make comparisons,
// but you may provide a method equals() instead.
/**
 * @summary Add a custom datatype to EJSON.
 * @locus Anywhere
 * @param {String} name A tag for your custom type; must be unique among custom data types defined in your project, and must match the result of your type's `typeName` method.
 * @param {Function} factory A function that deserializes a JSON-compatible value into an instance of your type.  This should match the serialization performed by your type's `toJSONValue` method.
 */
EJSON.addType = function (name, factory) {
  if (_.has(customTypes, name))
    throw new Error("Type " + name + " already present");
  customTypes[name] = factory;
};

var isInfOrNan = function (obj) {
  return _.isNaN(obj) || obj === Infinity || obj === -Infinity;
};

var builtinConverters = [
  { // Date
    matchJSONValue: function (obj) {
      return _.has(obj, '$date') && _.size(obj) === 1;
    },
    matchObject: function (obj) {
      return obj instanceof Date;
    },
    toJSONValue: function (obj) {
      return {$date: obj.getTime()};
    },
    fromJSONValue: function (obj) {
      return new Date(obj.$date);
    }
  },
  { // NaN, Inf, -Inf. (These are the only objects with typeof !== 'object'
    // which we match.)
    matchJSONValue: function (obj) {
      return _.has(obj, '$InfNaN') && _.size(obj) === 1;
    },
    matchObject: isInfOrNan,
    toJSONValue: function (obj) {
      var sign;
      if (_.isNaN(obj))
        sign = 0;
      else if (obj === Infinity)
        sign = 1;
      else
        sign = -1;
      return {$InfNaN: sign};
    },
    fromJSONValue: function (obj) {
      return obj.$InfNaN/0;
    }
  },
  { // Binary
    matchJSONValue: function (obj) {
      return _.has(obj, '$binary') && _.size(obj) === 1;
    },
    matchObject: function (obj) {
      return typeof Uint8Array !== 'undefined' && obj instanceof Uint8Array
        || (obj && _.has(obj, '$Uint8ArrayPolyfill'));
    },
    toJSONValue: function (obj) {
      return {$binary: Base64.encode(obj)};
    },
    fromJSONValue: function (obj) {
      return Base64.decode(obj.$binary);
    }
  },
  { // Escaping one level
    matchJSONValue: function (obj) {
      return _.has(obj, '$escape') && _.size(obj) === 1;
    },
    matchObject: function (obj) {
      if (_.isEmpty(obj) || _.size(obj) > 2) {
        return false;
      }
      return _.any(builtinConverters, function (converter) {
        return converter.matchJSONValue(obj);
      });
    },
    toJSONValue: function (obj) {
      var newObj = {};
      _.each(obj, function (value, key) {
        newObj[key] = EJSON.toJSONValue(value);
      });
      return {$escape: newObj};
    },
    fromJSONValue: function (obj) {
      var newObj = {};
      _.each(obj.$escape, function (value, key) {
        newObj[key] = EJSON.fromJSONValue(value);
      });
      return newObj;
    }
  },
  { // Custom
    matchJSONValue: function (obj) {
      return _.has(obj, '$type') && _.has(obj, '$value') && _.size(obj) === 2;
    },
    matchObject: function (obj) {
      return EJSON._isCustomType(obj);
    },
    toJSONValue: function (obj) {
      var jsonValue = Meteor._noYieldsAllowed(function () {
        return obj.toJSONValue();
      });
      return {$type: obj.typeName(), $value: jsonValue};
    },
    fromJSONValue: function (obj) {
      var typeName = obj.$type;
      if (!_.has(customTypes, typeName))
        throw new Error("Custom EJSON type " + typeName + " is not defined");
      var converter = customTypes[typeName];
      return Meteor._noYieldsAllowed(function () {
        return converter(obj.$value);
      });
    }
  }
];

EJSON._isCustomType = function (obj) {
  return obj &&
    typeof obj.toJSONValue === 'function' &&
    typeof obj.typeName === 'function' &&
    _.has(customTypes, obj.typeName());
};

EJSON._getTypes = function () {
  return customTypes;
};

EJSON._getConverters = function () {
  return builtinConverters;
};

// for both arrays and objects, in-place modification.
var adjustTypesToJSONValue =
EJSON._adjustTypesToJSONValue = function (obj) {
  // Is it an atom that we need to adjust?
  if (obj === null)
    return null;
  var maybeChanged = toJSONValueHelper(obj);
  if (maybeChanged !== undefined)
    return maybeChanged;

  // Other atoms are unchanged.
  if (typeof obj !== 'object')
    return obj;

  // Iterate over array or object structure.
  _.each(obj, function (value, key) {
    if (typeof value !== 'object' && value !== undefined &&
        !isInfOrNan(value))
      return; // continue

    var changed = toJSONValueHelper(value);
    if (changed) {
      obj[key] = changed;
      return; // on to the next key
    }
    // if we get here, value is an object but not adjustable
    // at this level.  recurse.
    adjustTypesToJSONValue(value);
  });
  return obj;
};

// Either return the JSON-compatible version of the argument, or undefined (if
// the item isn't itself replaceable, but maybe some fields in it are)
var toJSONValueHelper = function (item) {
  for (var i = 0; i < builtinConverters.length; i++) {
    var converter = builtinConverters[i];
    if (converter.matchObject(item)) {
      return converter.toJSONValue(item);
    }
  }
  return undefined;
};

/**
 * @summary Serialize an EJSON-compatible value into its plain JSON representation.
 * @locus Anywhere
 * @param {EJSON} val A value to serialize to plain JSON.
 */
EJSON.toJSONValue = function (item) {
  var changed = toJSONValueHelper(item);
  if (changed !== undefined)
    return changed;
  if (typeof item === 'object') {
    item = EJSON.clone(item);
    adjustTypesToJSONValue(item);
  }
  return item;
};

// for both arrays and objects. Tries its best to just
// use the object you hand it, but may return something
// different if the object you hand it itself needs changing.
//
var adjustTypesFromJSONValue =
EJSON._adjustTypesFromJSONValue = function (obj) {
  if (obj === null)
    return null;
  var maybeChanged = fromJSONValueHelper(obj);
  if (maybeChanged !== obj)
    return maybeChanged;

  // Other atoms are unchanged.
  if (typeof obj !== 'object')
    return obj;

  _.each(obj, function (value, key) {
    if (typeof value === 'object') {
      var changed = fromJSONValueHelper(value);
      if (value !== changed) {
        obj[key] = changed;
        return;
      }
      // if we get here, value is an object but not adjustable
      // at this level.  recurse.
      adjustTypesFromJSONValue(value);
    }
  });
  return obj;
};

// Either return the argument changed to have the non-json
// rep of itself (the Object version) or the argument itself.

// DOES NOT RECURSE.  For actually getting the fully-changed value, use
// EJSON.fromJSONValue
var fromJSONValueHelper = function (value) {
  if (typeof value === 'object' && value !== null) {
    if (_.size(value) <= 2
        && _.all(value, function (v, k) {
          return typeof k === 'string' && k.substr(0, 1) === '$';
        })) {
      for (var i = 0; i < builtinConverters.length; i++) {
        var converter = builtinConverters[i];
        if (converter.matchJSONValue(value)) {
          return converter.fromJSONValue(value);
        }
      }
    }
  }
  return value;
};

/**
 * @summary Deserialize an EJSON value from its plain JSON representation.
 * @locus Anywhere
 * @param {JSONCompatible} val A value to deserialize into EJSON.
 */
EJSON.fromJSONValue = function (item) {
  var changed = fromJSONValueHelper(item);
  if (changed === item && typeof item === 'object') {
    item = EJSON.clone(item);
    adjustTypesFromJSONValue(item);
    return item;
  } else {
    return changed;
  }
};

/**
 * @summary Serialize a value to a string.

For EJSON values, the serialization fully represents the value. For non-EJSON values, serializes the same way as `JSON.stringify`.
 * @locus Anywhere
 * @param {EJSON} val A value to stringify.
 * @param {Object} [options]
 * @param {Boolean | Integer | String} options.indent Indents objects and arrays for easy readability.  When `true`, indents by 2 spaces; when an integer, indents by that number of spaces; and when a string, uses the string as the indentation pattern.
 * @param {Boolean} options.canonical When `true`, stringifies keys in an object in sorted order.
 */
EJSON.stringify = function (item, options) {
  var json = EJSON.toJSONValue(item);
  if (options && (options.canonical || options.indent)) {
    return EJSON._canonicalStringify(json, options);
  } else {
    return JSON.stringify(json);
  }
};

/**
 * @summary Parse a string into an EJSON value. Throws an error if the string is not valid EJSON.
 * @locus Anywhere
 * @param {String} str A string to parse into an EJSON value.
 */
EJSON.parse = function (item) {
  if (typeof item !== 'string')
    throw new Error("EJSON.parse argument should be a string");
  return EJSON.fromJSONValue(JSON.parse(item));
};

/**
 * @summary Returns true if `x` is a buffer of binary data, as returned from [`EJSON.newBinary`](#ejson_new_binary).
 * @param {Object} x The variable to check.
 * @locus Anywhere
 */
EJSON.isBinary = function (obj) {
  return !!((typeof Uint8Array !== 'undefined' && obj instanceof Uint8Array) ||
    (obj && obj.$Uint8ArrayPolyfill));
};

/**
 * @summary Return true if `a` and `b` are equal to each other.  Return false otherwise.  Uses the `equals` method on `a` if present, otherwise performs a deep comparison.
 * @locus Anywhere
 * @param {EJSON} a
 * @param {EJSON} b
 * @param {Object} [options]
 * @param {Boolean} options.keyOrderSensitive Compare in key sensitive order, if supported by the JavaScript implementation.  For example, `{a: 1, b: 2}` is equal to `{b: 2, a: 1}` only when `keyOrderSensitive` is `false`.  The default is `false`.
 */
EJSON.equals = function (a, b, options) {
  var i;
  var keyOrderSensitive = !!(options && options.keyOrderSensitive);
  if (a === b)
    return true;
  if (_.isNaN(a) && _.isNaN(b))
    return true; // This differs from the IEEE spec for NaN equality, b/c we don't want
                 // anything ever with a NaN to be poisoned from becoming equal to anything.
  if (!a || !b) // if either one is falsy, they'd have to be === to be equal
    return false;
  if (!(typeof a === 'object' && typeof b === 'object'))
    return false;
  if (a instanceof Date && b instanceof Date)
    return a.valueOf() === b.valueOf();
  if (EJSON.isBinary(a) && EJSON.isBinary(b)) {
    if (a.length !== b.length)
      return false;
    for (i = 0; i < a.length; i++) {
      if (a[i] !== b[i])
        return false;
    }
    return true;
  }
  if (typeof (a.equals) === 'function')
    return a.equals(b, options);
  if (typeof (b.equals) === 'function')
    return b.equals(a, options);
  if (a instanceof Array) {
    if (!(b instanceof Array))
      return false;
    if (a.length !== b.length)
      return false;
    for (i = 0; i < a.length; i++) {
      if (!EJSON.equals(a[i], b[i], options))
        return false;
    }
    return true;
  }
  // fallback for custom types that don't implement their own equals
  switch (EJSON._isCustomType(a) + EJSON._isCustomType(b)) {
    case 1: return false;
    case 2: return EJSON.equals(EJSON.toJSONValue(a), EJSON.toJSONValue(b));
  }
  // fall back to structural equality of objects
  var ret;
  if (keyOrderSensitive) {
    var bKeys = [];
    _.each(b, function (val, x) {
        bKeys.push(x);
    });
    i = 0;
    ret = _.all(a, function (val, x) {
      if (i >= bKeys.length) {
        return false;
      }
      if (x !== bKeys[i]) {
        return false;
      }
      if (!EJSON.equals(val, b[bKeys[i]], options)) {
        return false;
      }
      i++;
      return true;
    });
    return ret && i === bKeys.length;
  } else {
    i = 0;
    ret = _.all(a, function (val, key) {
      if (!_.has(b, key)) {
        return false;
      }
      if (!EJSON.equals(val, b[key], options)) {
        return false;
      }
      i++;
      return true;
    });
    return ret && _.size(b) === i;
  }
};

/**
 * @summary Return a deep copy of `val`.
 * @locus Anywhere
 * @param {EJSON} val A value to copy.
 */
EJSON.clone = function (v) {
  var ret;
  if (typeof v !== "object")
    return v;
  if (v === null)
    return null; // null has typeof "object"
  if (v instanceof Date)
    return new Date(v.getTime());
  // RegExps are not really EJSON elements (eg we don't define a serialization
  // for them), but they're immutable anyway, so we can support them in clone.
  if (v instanceof RegExp)
    return v;
  if (EJSON.isBinary(v)) {
    ret = EJSON.newBinary(v.length);
    for (var i = 0; i < v.length; i++) {
      ret[i] = v[i];
    }
    return ret;
  }
  // XXX: Use something better than underscore's isArray
  if (_.isArray(v) || _.isArguments(v)) {
    // For some reason, _.map doesn't work in this context on Opera (weird test
    // failures).
    ret = [];
    for (i = 0; i < v.length; i++)
      ret[i] = EJSON.clone(v[i]);
    return ret;
  }
  // handle general user-defined typed Objects if they have a clone method
  if (typeof v.clone === 'function') {
    return v.clone();
  }
  // handle other custom types
  if (EJSON._isCustomType(v)) {
    return EJSON.fromJSONValue(EJSON.clone(EJSON.toJSONValue(v)), true);
  }
  // handle other objects
  ret = {};
  _.each(v, function (value, key) {
    ret[key] = EJSON.clone(value);
  });
  return ret;
};

/**
 * @summary Allocate a new buffer of binary data that EJSON can serialize.
 * @locus Anywhere
 * @param {Number} size The number of bytes of binary data to allocate.
 */
// EJSON.newBinary is the public documented API for this functionality,
// but the implementation is in the 'base64' package to avoid
// introducing a circular dependency. (If the implementation were here,
// then 'base64' would have to use EJSON.newBinary, and 'ejson' would
// also have to use 'base64'.)
EJSON.newBinary = Base64.newBinary;

// Based on json2.js from https://github.com/douglascrockford/JSON-js
//
//    json2.js
//    2012-10-08
//
//    Public Domain.
//
//    NO WARRANTY EXPRESSED OR IMPLIED. USE AT YOUR OWN RISK.

function quote(string) {
  return JSON.stringify(string);
}

var str = function (key, holder, singleIndent, outerIndent, canonical) {

  // Produce a string from holder[key].

  var i;          // The loop counter.
  var k;          // The member key.
  var v;          // The member value.
  var length;
  var innerIndent = outerIndent;
  var partial;
  var value = holder[key];

  // What happens next depends on the value's type.

  switch (typeof value) {
  case 'string':
    return quote(value);
  case 'number':
    // JSON numbers must be finite. Encode non-finite numbers as null.
    return isFinite(value) ? String(value) : 'null';
  case 'boolean':
    return String(value);
  // If the type is 'object', we might be dealing with an object or an array or
  // null.
  case 'object':
    // Due to a specification blunder in ECMAScript, typeof null is 'object',
    // so watch out for that case.
    if (!value) {
      return 'null';
    }
    // Make an array to hold the partial results of stringifying this object value.
    innerIndent = outerIndent + singleIndent;
    partial = [];

    // Is the value an array?
    if (_.isArray(value) || _.isArguments(value)) {

      // The value is an array. Stringify every element. Use null as a placeholder
      // for non-JSON values.

      length = value.length;
      for (i = 0; i < length; i += 1) {
        partial[i] = str(i, value, singleIndent, innerIndent, canonical) || 'null';
      }

      // Join all of the elements together, separated with commas, and wrap them in
      // brackets.

      if (partial.length === 0) {
        v = '[]';
      } else if (innerIndent) {
        v = '[\n' + innerIndent + partial.join(',\n' + innerIndent) + '\n' + outerIndent + ']';
      } else {
        v = '[' + partial.join(',') + ']';
      }
      return v;
    }


    // Iterate through all of the keys in the object.
    var keys = _.keys(value);
    if (canonical)
      keys = keys.sort();
    _.each(keys, function (k) {
      v = str(k, value, singleIndent, innerIndent, canonical);
      if (v) {
        partial.push(quote(k) + (innerIndent ? ': ' : ':') + v);
      }
    });


    // Join all of the member texts together, separated with commas,
    // and wrap them in braces.

    if (partial.length === 0) {
      v = '{}';
    } else if (innerIndent) {
      v = '{\n' + innerIndent + partial.join(',\n' + innerIndent) + '\n' + outerIndent + '}';
    } else {
      v = '{' + partial.join(',') + '}';
    }
    return v;
  }
}

// If the JSON object does not yet have a stringify method, give it one.

EJSON._canonicalStringify = function (value, options) {
  // Make a fake root object containing our value under the key of ''.
  // Return the result of stringifying the value.
  options = _.extend({
    indent: "",
    canonical: false
  }, options);
  if (options.indent === true) {
    options.indent = "  ";
  } else if (typeof options.indent === 'number') {
    var newIndent = "";
    for (var i = 0; i < options.indent; i++) {
      newIndent += ' ';
    }
    options.indent = newIndent;
  }
  return str('', {'': value}, options.indent, "", options.canonical);
};

  return EJSON;
}).call(this);