runet-censorship-bypass/extensions/chromium/pac-generator-extension/background.js

'use strict';

var RKN = {

  version: chrome.runtime.getManifest().version,
  csvMirrors: [
    'https://raw.githubusercontent.com/zapret-info/z-i/master/dump.csv',
    'http://sourceforge.net/p/z-i/code-0/HEAD/tree/dump.csv?format=raw',
    'https://www.assembla.com/spaces/z-i/git/source/master/dump.csv?_format=raw'
  ],
  lastUpdate: (new Date(0)).toString(),
  updatePeriodInMinutes: 7*60,
  ifEnabled: false,

  updateIcon: function(cb) {
    var cb = cb || () => {};
    return chrome.browserAction.setIcon(
      { path: this.ifEnabled ? './assets/icons/rkn.png' : './assets/icons/rkn-disabled.png' },
      cb
    );
  },

  disable: function(cb) {
    var cb = cb || () => {};

    if(!this.ifEnabled)
      return cb();

    this.checkForUpdates( (err, res) => {
      if (err) return cb(err);
      this.applyPac();
      this.ifEnabled = false;
      this.persistToStorage();
      return this.updateIcon(cb);
    });

  },

  enable: function(cb) {
    var cb = cb || () => {};

    return chrome.proxy.settings.clear({/*All*/}, () => {
      this.ifEnabled = true;
      this.persistToStorage();
      return this.updateIcon(cb);
    });

  },

  switch: function(cb) {
    var cb = cb || () => {};
    return this.ifEnabled ? this.disable(cb) : this.enable(cb);
  },

  persistToStorage: function(cb) {
    var cb = cb || () => {};
    var storage = {};
    storage[this.version] = JSON.stringify(this);
    chrome.storage.local.set(storage, cb);
  },
  syncWithStorage: function(cb) {
    var cb = cb || () => {};
    chrome.storage.local.get(
      this.version,
      object => {
        if (!Object.keys(object).length)
          return this.persistToStorage(cb);

        var self = JSON.parse(object[this.version]);

        for(var key of Object.keys(self))
          this[key] = self[key];

        return cb(this);
      }
    );
  },

  install: function() {
    chrome.storage.local.clear();
    this.disable();
  },

  rescheduleUpdate: function(period) {
    var checkNewBlocked = 'Check for new blocked sites';
    var period = period || this.updatePeriodInMinutes;
    chrome.alarms.clearAll( ifWasCleared => {

      chrome.alarms.create(checkNewBlocked, {
        delayInMinutes: period
      });

      chrome.alarms.onAlarm.addListener( alarm => {
        if (alarm.name === checkNewBlocked) {
          this.checkForUpdate();
        }
      });

    });
  },
  checkForUpdates: function(url, cb) {

    if (!url || !cb)
      return this._useTheMirrorsLuke(this.checkForUpdates, url, cb);

	  var req = new XMLHttpRequest();
    var ifAsync = true;
	  req.open('HEAD', url, ifAsync);
	  req.onload = event => {
      if (req.status === 404)
        return cb(req.status);

      var date = Date.parse(req.getResponseHeader('Date'));
      if (date > Date.parse(this.lastUpdate))
        return this.update(url, cb);

      return cb(null);
    };
	  req.send(null);
  },
  update: function(url, cb) {

    if (!url || !cb)
      return this._useTheMirrorsLuke(this.update, url, cb);

	  var req = new XMLHttpRequest();
	  req.open('GET', url, true);
	  req.onload = event => {
      this.lastUpdate = (new Date()).toString();
      this.generatePacFromCsv(req.responseText);
      this.persistToStorage();
      this.rescheduleUpdate();
      return cb(null, req.responseText);
    };
	  req.send(null);
  },
  generatePacFromCsv: function(csv) {
    this.pac = chrome.extension.getBackgroundPage().generatePac(csv);
    return this.pac;
  },
  applyPac: function(pac) {

    var pac = pac || this.pac;

    var config = {
      mode: 'pac_script',
      pacScript: {
        data: pac,
        mandatory: true
      }
    };

    chrome.proxy.settings.set(
      {value: config, scope: 'regular'}, function() {}
    );

  },
  _useTheMirrorsLuke: function(method, url, cb) {

    if (!cb)
      if (typeof url === 'function') {
        cb = url;
        url = undefined;
      } else cb = () => {};

    var it;
    if (typeof url === 'string')
      it = [url][Symbol.iterator]();
    else
      it = url || this.csvMirrors[Symbol.iterator]();

    var self = this;
    function cbb(err, res) {
      var cur = it.next();
      if (cur.done || !err)
        return cb(err, res);

      method.call(self, cur.value, cbb);
    }

    var url = it.next().value;
    return method.call(this, url, cbb);
  }
};

chrome.storage.local.clear();
RKN.syncWithStorage( () => RKN.updateIcon() );

chrome.runtime.onInstalled.addListener( details => {
  switch(details.reason) {
    case 'install':
    case 'update':
      RKN.install();
  }
});

chrome.browserAction.onClicked.addListener( tab => {alert('!!');} );

//==============GENERATE-PACS.JS============================

function generatePac(input) {

  var columnsSep = ';';
  var valuesSep = /\s*\|\s*/g;

  var ips = [], hosts = [], urls = [], orgs = [], date, reason;

  var lines = input.trim().split(/\r?\n/g).slice(1);
  lines.forEach( function(line) {
    var values = line.split( columnsSep );
    var newIps    = values.shift().split( valuesSep );
    var newHosts  = values.shift().split( valuesSep ).map( punycode.toASCII ).map( function(h) { return h.replace(/\.+$/g); } );
    var newUrls   = values.shift().split( valuesSep );
    var newOrgs   = values.shift().split( valuesSep );
    var newDate   = values.pop();
    var newReason = values.join(';');
    ips.push.apply(ips, newIps);
    hosts.push.apply(hosts, newHosts);

  });

  function toHash(arr) {
    var res = {};
    arr.forEach( function(el) { res[el] = true; } );
    return res;
  }

  var ipsHash   = toHash(ips);
  var hostsHash = toHash(hosts);

  // Remove duplicates and sort.
  var ips   = Object.keys(ipsHash).sort();
  var hosts = Object.keys(hostsHash).sort();

  function FindProxyForURL(url, host) {
    // ProstoVPN.AntiZapret PAC-ip File
    // Generated on Sun Nov 22 10:12:29 MSK 2015

    // The whole PAC script is reevaluated on each call of this function.

    host = host.replace(/\.+$/).toLowerCase(); // E.g. WinHTTP may be nasty.

    // HTTPS proxy is a HTTP proxy over SSL. It is NOT CONNECT proxy!
    // Supported only in Chrome and Firefox.
    // http://www.chromium.org/developers/design-documents/secure-web-proxy
    // This is to bypass FULL DPI
    var isIE = /*@cc_on!@*/!1;
    var viaProxy = isIE
    ? 'PROXY proxy.antizapret.prostovpn.org:3128; DIRECT'
    : 'HTTPS proxy.antizapret.prostovpn.org:3143; PROXY proxy.antizapret.prostovpn.org:3128; DIRECT';

    return IFPROXY() ? viaProxy : 'DIRECT';
  }

  var pacTemplate = FindProxyForURL.toString();

  function stringifyCall() {
    var fun = arguments[0];
    var args = [].slice.call( arguments, 1 )
    .map( function(a) { return typeof a !== 'string' ? JSON.stringify(a) : a; } ).join(', ');
    return '('+fun+')('+args+')';
  }

  // REVERSED HOSTS SWITCH

  function populateTrie(trie, doms) {

    var dom = doms.pop();
    if (!doms.length || doms.length === 1 && doms[0] === 'www') {
      trie[''] = trie[''] || [];
      trie[''].push( dom )
      return trie;
    }

    if (trie[''] && trie[''].indexOf(dom) !== -1) // Subdomain of a blocked domain.
    return trie;

    trie[dom] = trie[dom] || {};

    populateTrie( trie[dom], doms );
    return trie;
  }

  var trie = {};
  hosts.forEach( function(host) {
    var doms = host.replace(/\.+$/).split('.');
    populateTrie(trie, doms);
  });

  function trieToSwitch(trie, indent) {

    var _indent = indent || '';
    var indent = _indent + '  ';
    var keys = Object.keys(trie).sort();

    if (!trie[''] && keys.length === 1) {
      var key = keys[0];
      return _indent + 'if (doms.pop() === "'+key+'")\n'+ trieToSwitch(trie[key], indent);
    }

    var cases = '';
    if (trie['']) {
      var values = trie[''].sort();

      if (values.length === 1 && keys.length === 1)
        return _indent + 'return doms.pop() === "'+values[0]+'";\n';

      cases =
        values.filter( function(v) { return v; } ).map( function(val) { return indent +'case "'+val+'":\n'; } ).join('') + indent +'  return true;\n';

      delete trie[''];
      keys = Object.keys(trie).sort();
    }

    cases += keys.filter( function(k) { return k; } ).map(
      function(key) {
        var tmp = trieToSwitch( trie[key], indent+'  ');
        if (!/^\s*return/.test(tmp))
          tmp += indent+'  break;\n';
        return indent +'case "'+key+'":\n' +tmp;
      }).join('');

    return ''
    + _indent +'switch( doms.pop() ) {\n'
    + cases
    + _indent +'}\n';
  }

  function ifProxyByTrie(host) {
    var doms = host.replace(/\.+$/).split('.');
    "{SWITCH}"
    return false;
  }

  var ifProxyByTrieStr = ifProxyByTrie.toString().replace('"{SWITCH}"', trieToSwitch(trie, '  '));

  return pacTemplate
    .replace( 'IFPROXY()', stringifyCall(ifProxyByTrieStr, 'host') );
}

//==============PUNYCODE====================================

/*! https://mths.be/punycode v1.3.2 by @mathias */
;(function(root) {

	/** Detect free variables */
	var freeExports = typeof exports == 'object' && exports &&
		!exports.nodeType && exports;
	var freeModule = typeof module == 'object' && module &&
		!module.nodeType && module;
	var freeGlobal = typeof global == 'object' && global;
	if (
		freeGlobal.global === freeGlobal ||
		freeGlobal.window === freeGlobal ||
		freeGlobal.self === freeGlobal
	) {
		root = freeGlobal;
	}

	/**
	 * The `punycode` object.
	 * @name punycode
	 * @type Object
	 */
	var punycode,

	/** Highest positive signed 32-bit float value */
	maxInt = 2147483647, // aka. 0x7FFFFFFF or 2^31-1

	/** Bootstring parameters */
	base = 36,
	tMin = 1,
	tMax = 26,
	skew = 38,
	damp = 700,
	initialBias = 72,
	initialN = 128, // 0x80
	delimiter = '-', // '\x2D'

	/** Regular expressions */
	regexPunycode = /^xn--/,
	regexNonASCII = /[^\x20-\x7E]/, // unprintable ASCII chars + non-ASCII chars
	regexSeparators = /[\x2E\u3002\uFF0E\uFF61]/g, // RFC 3490 separators

	/** Error messages */
	errors = {
		'overflow': 'Overflow: input needs wider integers to process',
		'not-basic': 'Illegal input >= 0x80 (not a basic code point)',
		'invalid-input': 'Invalid input'
	},

	/** Convenience shortcuts */
	baseMinusTMin = base - tMin,
	floor = Math.floor,
	stringFromCharCode = String.fromCharCode,

	/** Temporary variable */
	key;

	/*--------------------------------------------------------------------------*/

	/**
	 * A generic error utility function.
	 * @private
	 * @param {String} type The error type.
	 * @returns {Error} Throws a `RangeError` with the applicable error message.
	 */
	function error(type) {
		throw new RangeError(errors[type]);
	}

	/**
	 * A generic `Array#map` utility function.
	 * @private
	 * @param {Array} array The array to iterate over.
	 * @param {Function} callback The function that gets called for every array
	 * item.
	 * @returns {Array} A new array of values returned by the callback function.
	 */
	function map(array, fn) {
		var length = array.length;
		var result = [];
		while (length--) {
			result[length] = fn(array[length]);
		}
		return result;
	}

	/**
	 * A simple `Array#map`-like wrapper to work with domain name strings or email
	 * addresses.
	 * @private
	 * @param {String} domain The domain name or email address.
	 * @param {Function} callback The function that gets called for every
	 * character.
	 * @returns {Array} A new string of characters returned by the callback
	 * function.
	 */
	function mapDomain(string, fn) {
		var parts = string.split('@');
		var result = '';
		if (parts.length > 1) {
			// In email addresses, only the domain name should be punycoded. Leave
			// the local part (i.e. everything up to `@`) intact.
			result = parts[0] + '@';
			string = parts[1];
		}
		// Avoid `split(regex)` for IE8 compatibility. See #17.
		string = string.replace(regexSeparators, '\x2E');
		var labels = string.split('.');
		var encoded = map(labels, fn).join('.');
		return result + encoded;
	}

	/**
	 * Creates an array containing the numeric code points of each Unicode
	 * character in the string. While JavaScript uses UCS-2 internally,
	 * this function will convert a pair of surrogate halves (each of which
	 * UCS-2 exposes as separate characters) into a single code point,
	 * matching UTF-16.
	 * @see `punycode.ucs2.encode`
	 * @see <https://mathiasbynens.be/notes/javascript-encoding>
	 * @memberOf punycode.ucs2
	 * @name decode
	 * @param {String} string The Unicode input string (UCS-2).
	 * @returns {Array} The new array of code points.
	 */
	function ucs2decode(string) {
		var output = [],
		    counter = 0,
		    length = string.length,
		    value,
		    extra;
		while (counter < length) {
			value = string.charCodeAt(counter++);
			if (value >= 0xD800 && value <= 0xDBFF && counter < length) {
				// high surrogate, and there is a next character
				extra = string.charCodeAt(counter++);
				if ((extra & 0xFC00) == 0xDC00) { // low surrogate
					output.push(((value & 0x3FF) << 10) + (extra & 0x3FF) + 0x10000);
				} else {
					// unmatched surrogate; only append this code unit, in case the next
					// code unit is the high surrogate of a surrogate pair
					output.push(value);
					counter--;
				}
			} else {
				output.push(value);
			}
		}
		return output;
	}

	/**
	 * Creates a string based on an array of numeric code points.
	 * @see `punycode.ucs2.decode`
	 * @memberOf punycode.ucs2
	 * @name encode
	 * @param {Array} codePoints The array of numeric code points.
	 * @returns {String} The new Unicode string (UCS-2).
	 */
	function ucs2encode(array) {
		return map(array, function(value) {
			var output = '';
			if (value > 0xFFFF) {
				value -= 0x10000;
				output += stringFromCharCode(value >>> 10 & 0x3FF | 0xD800);
				value = 0xDC00 | value & 0x3FF;
			}
			output += stringFromCharCode(value);
			return output;
		}).join('');
	}

	/**
	 * Converts a basic code point into a digit/integer.
	 * @see `digitToBasic()`
	 * @private
	 * @param {Number} codePoint The basic numeric code point value.
	 * @returns {Number} The numeric value of a basic code point (for use in
	 * representing integers) in the range `0` to `base - 1`, or `base` if
	 * the code point does not represent a value.
	 */
	function basicToDigit(codePoint) {
		if (codePoint - 48 < 10) {
			return codePoint - 22;
		}
		if (codePoint - 65 < 26) {
			return codePoint - 65;
		}
		if (codePoint - 97 < 26) {
			return codePoint - 97;
		}
		return base;
	}

	/**
	 * Converts a digit/integer into a basic code point.
	 * @see `basicToDigit()`
	 * @private
	 * @param {Number} digit The numeric value of a basic code point.
	 * @returns {Number} The basic code point whose value (when used for
	 * representing integers) is `digit`, which needs to be in the range
	 * `0` to `base - 1`. If `flag` is non-zero, the uppercase form is
	 * used; else, the lowercase form is used. The behavior is undefined
	 * if `flag` is non-zero and `digit` has no uppercase form.
	 */
	function digitToBasic(digit, flag) {
		//  0..25 map to ASCII a..z or A..Z
		// 26..35 map to ASCII 0..9
		return digit + 22 + 75 * (digit < 26) - ((flag != 0) << 5);
	}

	/**
	 * Bias adaptation function as per section 3.4 of RFC 3492.
	 * https://tools.ietf.org/html/rfc3492#section-3.4
	 * @private
	 */
	function adapt(delta, numPoints, firstTime) {
		var k = 0;
		delta = firstTime ? floor(delta / damp) : delta >> 1;
		delta += floor(delta / numPoints);
		for (/* no initialization */; delta > baseMinusTMin * tMax >> 1; k += base) {
			delta = floor(delta / baseMinusTMin);
		}
		return floor(k + (baseMinusTMin + 1) * delta / (delta + skew));
	}

	/**
	 * Converts a Punycode string of ASCII-only symbols to a string of Unicode
	 * symbols.
	 * @memberOf punycode
	 * @param {String} input The Punycode string of ASCII-only symbols.
	 * @returns {String} The resulting string of Unicode symbols.
	 */
	function decode(input) {
		// Don't use UCS-2
		var output = [],
		    inputLength = input.length,
		    out,
		    i = 0,
		    n = initialN,
		    bias = initialBias,
		    basic,
		    j,
		    index,
		    oldi,
		    w,
		    k,
		    digit,
		    t,
		    /** Cached calculation results */
		    baseMinusT;

		// Handle the basic code points: let `basic` be the number of input code
		// points before the last delimiter, or `0` if there is none, then copy
		// the first basic code points to the output.

		basic = input.lastIndexOf(delimiter);
		if (basic < 0) {
			basic = 0;
		}

		for (j = 0; j < basic; ++j) {
			// if it's not a basic code point
			if (input.charCodeAt(j) >= 0x80) {
				error('not-basic');
			}
			output.push(input.charCodeAt(j));
		}

		// Main decoding loop: start just after the last delimiter if any basic code
		// points were copied; start at the beginning otherwise.

		for (index = basic > 0 ? basic + 1 : 0; index < inputLength; /* no final expression */) {

			// `index` is the index of the next character to be consumed.
			// Decode a generalized variable-length integer into `delta`,
			// which gets added to `i`. The overflow checking is easier
			// if we increase `i` as we go, then subtract off its starting
			// value at the end to obtain `delta`.
			for (oldi = i, w = 1, k = base; /* no condition */; k += base) {

				if (index >= inputLength) {
					error('invalid-input');
				}

				digit = basicToDigit(input.charCodeAt(index++));

				if (digit >= base || digit > floor((maxInt - i) / w)) {
					error('overflow');
				}

				i += digit * w;
				t = k <= bias ? tMin : (k >= bias + tMax ? tMax : k - bias);

				if (digit < t) {
					break;
				}

				baseMinusT = base - t;
				if (w > floor(maxInt / baseMinusT)) {
					error('overflow');
				}

				w *= baseMinusT;

			}

			out = output.length + 1;
			bias = adapt(i - oldi, out, oldi == 0);

			// `i` was supposed to wrap around from `out` to `0`,
			// incrementing `n` each time, so we'll fix that now:
			if (floor(i / out) > maxInt - n) {
				error('overflow');
			}

			n += floor(i / out);
			i %= out;

			// Insert `n` at position `i` of the output
			output.splice(i++, 0, n);

		}

		return ucs2encode(output);
	}

	/**
	 * Converts a string of Unicode symbols (e.g. a domain name label) to a
	 * Punycode string of ASCII-only symbols.
	 * @memberOf punycode
	 * @param {String} input The string of Unicode symbols.
	 * @returns {String} The resulting Punycode string of ASCII-only symbols.
	 */
	function encode(input) {
		var n,
		    delta,
		    handledCPCount,
		    basicLength,
		    bias,
		    j,
		    m,
		    q,
		    k,
		    t,
		    currentValue,
		    output = [],
		    /** `inputLength` will hold the number of code points in `input`. */
		    inputLength,
		    /** Cached calculation results */
		    handledCPCountPlusOne,
		    baseMinusT,
		    qMinusT;

		// Convert the input in UCS-2 to Unicode
		input = ucs2decode(input);

		// Cache the length
		inputLength = input.length;

		// Initialize the state
		n = initialN;
		delta = 0;
		bias = initialBias;

		// Handle the basic code points
		for (j = 0; j < inputLength; ++j) {
			currentValue = input[j];
			if (currentValue < 0x80) {
				output.push(stringFromCharCode(currentValue));
			}
		}

		handledCPCount = basicLength = output.length;

		// `handledCPCount` is the number of code points that have been handled;
		// `basicLength` is the number of basic code points.

		// Finish the basic string - if it is not empty - with a delimiter
		if (basicLength) {
			output.push(delimiter);
		}

		// Main encoding loop:
		while (handledCPCount < inputLength) {

			// All non-basic code points < n have been handled already. Find the next
			// larger one:
			for (m = maxInt, j = 0; j < inputLength; ++j) {
				currentValue = input[j];
				if (currentValue >= n && currentValue < m) {
					m = currentValue;
				}
			}

			// Increase `delta` enough to advance the decoder's <n,i> state to <m,0>,
			// but guard against overflow
			handledCPCountPlusOne = handledCPCount + 1;
			if (m - n > floor((maxInt - delta) / handledCPCountPlusOne)) {
				error('overflow');
			}

			delta += (m - n) * handledCPCountPlusOne;
			n = m;

			for (j = 0; j < inputLength; ++j) {
				currentValue = input[j];

				if (currentValue < n && ++delta > maxInt) {
					error('overflow');
				}

				if (currentValue == n) {
					// Represent delta as a generalized variable-length integer
					for (q = delta, k = base; /* no condition */; k += base) {
						t = k <= bias ? tMin : (k >= bias + tMax ? tMax : k - bias);
						if (q < t) {
							break;
						}
						qMinusT = q - t;
						baseMinusT = base - t;
						output.push(
							stringFromCharCode(digitToBasic(t + qMinusT % baseMinusT, 0))
						);
						q = floor(qMinusT / baseMinusT);
					}

					output.push(stringFromCharCode(digitToBasic(q, 0)));
					bias = adapt(delta, handledCPCountPlusOne, handledCPCount == basicLength);
					delta = 0;
					++handledCPCount;
				}
			}

			++delta;
			++n;

		}
		return output.join('');
	}

	/**
	 * Converts a Punycode string representing a domain name or an email address
	 * to Unicode. Only the Punycoded parts of the input will be converted, i.e.
	 * it doesn't matter if you call it on a string that has already been
	 * converted to Unicode.
	 * @memberOf punycode
	 * @param {String} input The Punycoded domain name or email address to
	 * convert to Unicode.
	 * @returns {String} The Unicode representation of the given Punycode
	 * string.
	 */
	function toUnicode(input) {
		return mapDomain(input, function(string) {
			return regexPunycode.test(string)
				? decode(string.slice(4).toLowerCase())
				: string;
		});
	}

	/**
	 * Converts a Unicode string representing a domain name or an email address to
	 * Punycode. Only the non-ASCII parts of the domain name will be converted,
	 * i.e. it doesn't matter if you call it with a domain that's already in
	 * ASCII.
	 * @memberOf punycode
	 * @param {String} input The domain name or email address to convert, as a
	 * Unicode string.
	 * @returns {String} The Punycode representation of the given domain name or
	 * email address.
	 */
	function toASCII(input) {
		return mapDomain(input, function(string) {
			return regexNonASCII.test(string)
				? 'xn--' + encode(string)
				: string;
		});
	}

	/*--------------------------------------------------------------------------*/

	/** Define the public API */
	punycode = {
		/**
		 * A string representing the current Punycode.js version number.
		 * @memberOf punycode
		 * @type String
		 */
		'version': '1.3.2',
		/**
		 * An object of methods to convert from JavaScript's internal character
		 * representation (UCS-2) to Unicode code points, and back.
		 * @see <https://mathiasbynens.be/notes/javascript-encoding>
		 * @memberOf punycode
		 * @type Object
		 */
		'ucs2': {
			'decode': ucs2decode,
			'encode': ucs2encode
		},
		'decode': decode,
		'encode': encode,
		'toASCII': toASCII,
		'toUnicode': toUnicode
	};

	/** Expose `punycode` */
	// Some AMD build optimizers, like r.js, check for specific condition patterns
	// like the following:
	if (
		typeof define == 'function' &&
		typeof define.amd == 'object' &&
		define.amd
	) {
		define('punycode', function() {
			return punycode;
		});
	} else if (freeExports && freeModule) {
		if (module.exports == freeExports) { // in Node.js or RingoJS v0.8.0+
			freeModule.exports = punycode;
		} else { // in Narwhal or RingoJS v0.7.0-
			for (key in punycode) {
				punycode.hasOwnProperty(key) && (freeExports[key] = punycode[key]);
			}
		}
	} else { // in Rhino or a web browser
		root.punycode = punycode;
	}

}(this));