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gecko/services/sync/modules/util.js
Marina Samuel 07d683aed8 Bug 664792 - Tune sync intervals according to user behaviour. r=philikon 
Part 2: Pull out all score- & interval-related code into a separate SyncScheduler component
2011-06-27 14:22:49 +01:00

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/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Bookmarks Sync.
*
* The Initial Developer of the Original Code is Mozilla.
* Portions created by the Initial Developer are Copyright (C) 2007
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Dan Mills <thunder@mozilla.com>
* Richard Newman <rnewman@mozilla.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
const EXPORTED_SYMBOLS = ["XPCOMUtils", "Services", "NetUtil", "PlacesUtils",
"FileUtils", "Utils", "Svc", "Str"];
const Cc = Components.classes;
const Ci = Components.interfaces;
const Cr = Components.results;
const Cu = Components.utils;
Cu.import("resource://services-sync/constants.js");
Cu.import("resource://services-sync/ext/Observers.js");
Cu.import("resource://services-sync/ext/Preferences.js");
Cu.import("resource://services-sync/ext/StringBundle.js");
Cu.import("resource://services-sync/log4moz.js");
Cu.import("resource://services-sync/status.js");
Cu.import("resource://gre/modules/XPCOMUtils.jsm");
Cu.import("resource://gre/modules/Services.jsm");
Cu.import("resource://gre/modules/PlacesUtils.jsm");
Cu.import("resource://gre/modules/NetUtil.jsm");
Cu.import("resource://gre/modules/FileUtils.jsm");
/*
* Utility functions
*/
let Utils = {
/**
* Execute an arbitrary number of asynchronous functions one after the
* other, passing the callback arguments on to the next one. All functions
* must take a callback function as their last argument. The 'this' object
* will be whatever asyncChain's is.
*
* @usage this._chain = Utils.asyncChain;
* this._chain(this.foo, this.bar, this.baz)(args, for, foo)
*
* This is equivalent to:
*
* let self = this;
* self.foo(args, for, foo, function (bars, args) {
* self.bar(bars, args, function (baz, params) {
* self.baz(baz, params);
* });
* });
*/
asyncChain: function asyncChain() {
let funcs = Array.slice(arguments);
let thisObj = this;
return function callback() {
if (funcs.length) {
let args = Array.slice(arguments).concat(callback);
let f = funcs.shift();
f.apply(thisObj, args);
}
};
},
/**
* Wrap a function to catch all exceptions and log them
*
* @usage MyObj._catch = Utils.catch;
* MyObj.foo = function() { this._catch(func)(); }
*
* Optionally pass a function which will be called if an
* exception occurs.
*/
catch: function Utils_catch(func, exceptionCallback) {
let thisArg = this;
return function WrappedCatch() {
try {
return func.call(thisArg);
}
catch(ex) {
thisArg._log.debug("Exception: " + Utils.exceptionStr(ex));
if (exceptionCallback) {
return exceptionCallback.call(thisArg, ex);
}
return null;
}
};
},
/**
* Wrap a function to call lock before calling the function then unlock.
*
* @usage MyObj._lock = Utils.lock;
* MyObj.foo = function() { this._lock(func)(); }
*/
lock: function lock(label, func) {
let thisArg = this;
return function WrappedLock() {
if (!thisArg.lock()) {
throw "Could not acquire lock. Label: \"" + label + "\".";
}
try {
return func.call(thisArg);
}
finally {
thisArg.unlock();
}
};
},
isLockException: function isLockException(ex) {
return ex && ex.indexOf && ex.indexOf("Could not acquire lock.") == 0;
},
/**
* Wrap functions to notify when it starts and finishes executing or if it got
* an error. The message is a combination of a provided prefix and local name
* with the current state and the subject is the provided subject.
*
* @usage function MyObj() { this._notify = Utils.notify("prefix:"); }
* MyObj.foo = function() { this._notify(name, subject, func)(); }
*/
notify: function Utils_notify(prefix) {
return function NotifyMaker(name, subject, func) {
let thisArg = this;
let notify = function(state) {
let mesg = prefix + name + ":" + state;
thisArg._log.trace("Event: " + mesg);
Observers.notify(mesg, subject);
};
return function WrappedNotify() {
try {
notify("start");
let ret = func.call(thisArg);
notify("finish");
return ret;
}
catch(ex) {
notify("error");
throw ex;
}
};
};
},
runInTransaction: function(db, callback, thisObj) {
let hasTransaction = false;
try {
db.beginTransaction();
hasTransaction = true;
} catch(e) { /* om nom nom exceptions */ }
try {
return callback.call(thisObj);
} finally {
if (hasTransaction) {
db.commitTransaction();
}
}
},
/*
* Partition the input array into an array of arrays. Return a generator.
*/
slices: function slices(arr, sliceSize) {
if (!sliceSize || sliceSize <= 0)
throw "Invalid slice size.";
if (sliceSize > arr.length) {
yield arr;
} else {
let offset = 0;
while (arr.length > offset) {
yield arr.slice(offset, offset + sliceSize);
offset += sliceSize;
}
}
},
byteArrayToString: function byteArrayToString(bytes) {
return [String.fromCharCode(byte) for each (byte in bytes)].join("");
},
/**
* Generate a string of random bytes.
*/
generateRandomBytes: function generateRandomBytes(length) {
let rng = Cc["@mozilla.org/security/random-generator;1"]
.createInstance(Ci.nsIRandomGenerator);
let bytes = rng.generateRandomBytes(length);
return Utils.byteArrayToString(bytes);
},
/**
* Encode byte string as base64url (RFC 4648).
*/
encodeBase64url: function encodeBase64url(bytes) {
return btoa(bytes).replace('+', '-', 'g').replace('/', '_', 'g');
},
/**
* GUIDs are 9 random bytes encoded with base64url (RFC 4648).
* That makes them 12 characters long with 72 bits of entropy.
*/
makeGUID: function makeGUID() {
return Utils.encodeBase64url(Utils.generateRandomBytes(9));
},
_base64url_regex: /^[-abcdefghijklmnopqrstuvwxyz0123456789_]{12}$/i,
checkGUID: function checkGUID(guid) {
return !!guid && this._base64url_regex.test(guid);
},
ensureOneOpen: let (windows = {}) function ensureOneOpen(window) {
// Close the other window if it exists
let url = window.location.href;
let other = windows[url];
if (other != null)
other.close();
// Save the new window for future closure
windows[url] = window;
// Actively clean up when the window is closed
window.addEventListener("unload", function() windows[url] = null, false);
},
// Returns a nsILocalFile representing a file relative to the current
// user's profile directory. The argument should be a string with
// unix-style slashes for directory names (these slashes are automatically
// converted to platform-specific path separators).
getProfileFile: function getProfileFile(path) {
return FileUtils.getFile("ProfD", path.split("/"), true);
},
/**
* Add a simple getter/setter to an object that defers access of a property
* to an inner property.
*
* @param obj
* Object to add properties to defer in its prototype
* @param defer
* Property of obj to defer to
* @param prop
* Property name to defer (or an array of property names)
*/
deferGetSet: function Utils_deferGetSet(obj, defer, prop) {
if (Utils.isArray(prop))
return prop.map(function(prop) Utils.deferGetSet(obj, defer, prop));
let prot = obj.prototype;
// Create a getter if it doesn't exist yet
if (!prot.__lookupGetter__(prop)) {
prot.__defineGetter__(prop, function () {
return this[defer][prop];
});
}
// Create a setter if it doesn't exist yet
if (!prot.__lookupSetter__(prop)) {
prot.__defineSetter__(prop, function (val) {
this[defer][prop] = val;
});
}
},
/**
* Determine if some value is an array
*
* @param val
* Value to check (can be null, undefined, etc.)
* @return True if it's an array; false otherwise
*/
isArray: function Utils_isArray(val) val != null && typeof val == "object" &&
val.constructor.name == "Array",
lazyStrings: function Weave_lazyStrings(name) {
let bundle = "chrome://weave/locale/services/" + name + ".properties";
return function() new StringBundle(bundle);
},
deepEquals: function eq(a, b) {
// If they're triple equals, then it must be equals!
if (a === b)
return true;
// If they weren't equal, they must be objects to be different
if (typeof a != "object" || typeof b != "object")
return false;
// But null objects won't have properties to compare
if (a === null || b === null)
return false;
// Make sure all of a's keys have a matching value in b
for (let k in a)
if (!eq(a[k], b[k]))
return false;
// Do the same for b's keys but skip those that we already checked
for (let k in b)
if (!(k in a) && !eq(a[k], b[k]))
return false;
return true;
},
deepCopy: function Weave_deepCopy(thing, noSort) {
if (typeof(thing) != "object" || thing == null)
return thing;
let ret;
if (Utils.isArray(thing)) {
ret = [];
for (let i = 0; i < thing.length; i++)
ret.push(Utils.deepCopy(thing[i], noSort));
} else {
ret = {};
let props = [p for (p in thing)];
if (!noSort)
props = props.sort();
props.forEach(function(k) ret[k] = Utils.deepCopy(thing[k], noSort));
}
return ret;
},
// Works on frames or exceptions, munges file:// URIs to shorten the paths
// FIXME: filename munging is sort of hackish, might be confusing if
// there are multiple extensions with similar filenames
formatFrame: function Utils_formatFrame(frame) {
let tmp = "<file:unknown>";
let file = frame.filename || frame.fileName;
if (file)
tmp = file.replace(/^(?:chrome|file):.*?([^\/\.]+\.\w+)$/, "$1");
if (frame.lineNumber)
tmp += ":" + frame.lineNumber;
if (frame.name)
tmp = frame.name + "()@" + tmp;
return tmp;
},
exceptionStr: function Weave_exceptionStr(e) {
let message = e.message ? e.message : e;
return message + " " + Utils.stackTrace(e);
},
stackTraceFromFrame: function Weave_stackTraceFromFrame(frame) {
let output = [];
while (frame) {
let str = Utils.formatFrame(frame);
if (str)
output.push(str);
frame = frame.caller;
}
return output.join(" < ");
},
stackTrace: function Weave_stackTrace(e) {
// Wrapped nsIException
if (e.location)
return "Stack trace: " + Utils.stackTraceFromFrame(e.location);
// Standard JS exception
if (e.stack)
return "JS Stack trace: " + e.stack.trim().replace(/\n/g, " < ").
replace(/@[^@]*?([^\/\.]+\.\w+:)/g, "@$1");
return "No traceback available";
},
// Generator and discriminator for HMAC exceptions.
// Split these out in case we want to make them richer in future, and to
// avoid inevitable confusion if the message changes.
throwHMACMismatch: function throwHMACMismatch(shouldBe, is) {
throw "Record SHA256 HMAC mismatch: should be " + shouldBe + ", is " + is;
},
isHMACMismatch: function isHMACMismatch(ex) {
const hmacFail = "Record SHA256 HMAC mismatch: ";
return ex && ex.indexOf && (ex.indexOf(hmacFail) == 0);
},
/**
* UTF8-encode a message and hash it with the given hasher. Returns a
* string containing bytes. The hasher is reset if it's an HMAC hasher.
*/
digestUTF8: function digestUTF8(message, hasher) {
let data = this._utf8Converter.convertToByteArray(message, {});
hasher.update(data, data.length);
let result = hasher.finish(false);
if (hasher instanceof Ci.nsICryptoHMAC) {
hasher.reset();
}
return result;
},
/**
* Treat the given message as a bytes string and hash it with the given
* hasher. Returns a string containing bytes. The hasher is reset if it's
* an HMAC hasher.
*/
digestBytes: function digestBytes(message, hasher) {
// No UTF-8 encoding for you, sunshine.
let bytes = [b.charCodeAt() for each (b in message)];
hasher.update(bytes, bytes.length);
let result = hasher.finish(false);
if (hasher instanceof Ci.nsICryptoHMAC) {
hasher.reset();
}
return result;
},
bytesAsHex: function bytesAsHex(bytes) {
let hex = "";
for (let i = 0; i < bytes.length; i++) {
hex += ("0" + bytes[i].charCodeAt().toString(16)).slice(-2);
}
return hex;
},
_sha256: function _sha256(message) {
let hasher = Cc["@mozilla.org/security/hash;1"].
createInstance(Ci.nsICryptoHash);
hasher.init(hasher.SHA256);
return Utils.digestUTF8(message, hasher);
},
sha256: function sha256(message) {
return Utils.bytesAsHex(Utils._sha256(message));
},
sha256Base64: function (message) {
return btoa(Utils._sha256(message));
},
_sha1: function _sha1(message) {
let hasher = Cc["@mozilla.org/security/hash;1"].
createInstance(Ci.nsICryptoHash);
hasher.init(hasher.SHA1);
return Utils.digestUTF8(message, hasher);
},
sha1: function sha1(message) {
return Utils.bytesAsHex(Utils._sha1(message));
},
sha1Base32: function sha1Base32(message) {
return Utils.encodeBase32(Utils._sha1(message));
},
sha1Base64: function (message) {
return btoa(Utils._sha1(message));
},
/**
* Produce an HMAC key object from a key string.
*/
makeHMACKey: function makeHMACKey(str) {
return Svc.KeyFactory.keyFromString(Ci.nsIKeyObject.HMAC, str);
},
/**
* Produce an HMAC hasher and initialize it with the given HMAC key.
*/
makeHMACHasher: function makeHMACHasher(type, key) {
let hasher = Cc["@mozilla.org/security/hmac;1"]
.createInstance(Ci.nsICryptoHMAC);
hasher.init(type, key);
return hasher;
},
/**
* Some HMAC convenience functions for tests and backwards compatibility:
*
* sha1HMACBytes: hashes byte string, returns bytes string
* sha256HMAC: hashes UTF-8 encoded string, returns hex string
* sha256HMACBytes: hashes byte string, returns bytes string
*/
sha1HMACBytes: function sha1HMACBytes(message, key) {
let h = Utils.makeHMACHasher(Ci.nsICryptoHMAC.SHA1, key);
return Utils.digestBytes(message, h);
},
sha256HMAC: function sha256HMAC(message, key) {
let h = Utils.makeHMACHasher(Ci.nsICryptoHMAC.SHA256, key);
return Utils.bytesAsHex(Utils.digestUTF8(message, h));
},
sha256HMACBytes: function sha256HMACBytes(message, key) {
let h = Utils.makeHMACHasher(Ci.nsICryptoHMAC.SHA256, key);
return Utils.digestBytes(message, h);
},
/**
* HMAC-based Key Derivation Step 2 according to RFC 5869.
*/
hkdfExpand: function hkdfExpand(prk, info, len) {
const BLOCKSIZE = 256 / 8;
let h = Utils.makeHMACHasher(Ci.nsICryptoHMAC.SHA256,
Utils.makeHMACKey(prk));
let T = "";
let Tn = "";
let iterations = Math.ceil(len/BLOCKSIZE);
for (let i = 0; i < iterations; i++) {
Tn = Utils.digestBytes(Tn + info + String.fromCharCode(i + 1), h);
T += Tn;
}
return T.slice(0, len);
},
byteArrayToString: function byteArrayToString(bytes) {
return [String.fromCharCode(byte) for each (byte in bytes)].join("");
},
/**
* PBKDF2 implementation in Javascript.
*
* The arguments to this function correspond to items in
* PKCS #5, v2.0 pp. 9-10
*
* P: the passphrase, an octet string: e.g., "secret phrase"
* S: the salt, an octet string: e.g., "DNXPzPpiwn"
* c: the number of iterations, a positive integer: e.g., 4096
* dkLen: the length in octets of the destination
* key, a positive integer: e.g., 16
*
* The output is an octet string of length dkLen, which you
* can encode as you wish.
*/
pbkdf2Generate : function pbkdf2Generate(P, S, c, dkLen) {
// We don't have a default in the algo itself, as NSS does.
// Use the constant.
if (!dkLen)
dkLen = SYNC_KEY_DECODED_LENGTH;
/* For HMAC-SHA-1 */
const HLEN = 20;
function F(S, c, i, h) {
function XOR(a, b, isA) {
if (a.length != b.length) {
return false;
}
let val = [];
for (let i = 0; i < a.length; i++) {
if (isA) {
val[i] = a[i] ^ b[i];
} else {
val[i] = a.charCodeAt(i) ^ b.charCodeAt(i);
}
}
return val;
}
let ret;
let U = [];
/* Encode i into 4 octets: _INT */
let I = [];
I[0] = String.fromCharCode((i >> 24) & 0xff);
I[1] = String.fromCharCode((i >> 16) & 0xff);
I[2] = String.fromCharCode((i >> 8) & 0xff);
I[3] = String.fromCharCode(i & 0xff);
U[0] = Utils.digestBytes(S + I.join(''), h);
for (let j = 1; j < c; j++) {
U[j] = Utils.digestBytes(U[j - 1], h);
}
ret = U[0];
for (j = 1; j < c; j++) {
ret = Utils.byteArrayToString(XOR(ret, U[j]));
}
return ret;
}
let l = Math.ceil(dkLen / HLEN);
let r = dkLen - ((l - 1) * HLEN);
// Reuse the key and the hasher. Remaking them 4096 times is 'spensive.
let h = Utils.makeHMACHasher(Ci.nsICryptoHMAC.SHA1, Utils.makeHMACKey(P));
T = [];
for (let i = 0; i < l;) {
T[i] = F(S, c, ++i, h);
}
let ret = '';
for (i = 0; i < l-1;) {
ret += T[i++];
}
ret += T[l - 1].substr(0, r);
return ret;
},
/**
* Base32 decode (RFC 4648) a string.
*/
decodeBase32: function decodeBase32(str) {
const key = "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567";
let padChar = str.indexOf("=");
let chars = (padChar == -1) ? str.length : padChar;
let bytes = Math.floor(chars * 5 / 8);
let blocks = Math.ceil(chars / 8);
// Process a chunk of 5 bytes / 8 characters.
// The processing of this is known in advance,
// so avoid arithmetic!
function processBlock(ret, cOffset, rOffset) {
let c, val;
// N.B., this relies on
// undefined | foo == foo.
function accumulate(val) {
ret[rOffset] |= val;
}
function advance() {
c = str[cOffset++];
if (!c || c == "" || c == "=") // Easier than range checking.
throw "Done"; // Will be caught far away.
val = key.indexOf(c);
if (val == -1)
throw "Unknown character in base32: " + c;
}
// Handle a left shift, restricted to bytes.
function left(octet, shift)
(octet << shift) & 0xff;
advance();
accumulate(left(val, 3));
advance();
accumulate(val >> 2);
++rOffset;
accumulate(left(val, 6));
advance();
accumulate(left(val, 1));
advance();
accumulate(val >> 4);
++rOffset;
accumulate(left(val, 4));
advance();
accumulate(val >> 1);
++rOffset;
accumulate(left(val, 7));
advance();
accumulate(left(val, 2));
advance();
accumulate(val >> 3);
++rOffset;
accumulate(left(val, 5));
advance();
accumulate(val);
++rOffset;
}
// Our output. Define to be explicit (and maybe the compiler will be smart).
let ret = new Array(bytes);
let i = 0;
let cOff = 0;
let rOff = 0;
for (; i < blocks; ++i) {
try {
processBlock(ret, cOff, rOff);
} catch (ex) {
// Handle the detection of padding.
if (ex == "Done")
break;
throw ex;
}
cOff += 8;
rOff += 5;
}
// Slice in case our shift overflowed to the right.
return Utils.byteArrayToString(ret.slice(0, bytes));
},
/**
* Base32 encode (RFC 4648) a string
*/
encodeBase32: function encodeBase32(bytes) {
const key = "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567";
let quanta = Math.floor(bytes.length / 5);
let leftover = bytes.length % 5;
// Pad the last quantum with zeros so the length is a multiple of 5.
if (leftover) {
quanta += 1;
for (let i = leftover; i < 5; i++)
bytes += "\0";
}
// Chop the string into quanta of 5 bytes (40 bits). Each quantum
// is turned into 8 characters from the 32 character base.
let ret = "";
for (let i = 0; i < bytes.length; i += 5) {
let c = [byte.charCodeAt() for each (byte in bytes.slice(i, i + 5))];
ret += key[c[0] >> 3]
+ key[((c[0] << 2) & 0x1f) | (c[1] >> 6)]
+ key[(c[1] >> 1) & 0x1f]
+ key[((c[1] << 4) & 0x1f) | (c[2] >> 4)]
+ key[((c[2] << 1) & 0x1f) | (c[3] >> 7)]
+ key[(c[3] >> 2) & 0x1f]
+ key[((c[3] << 3) & 0x1f) | (c[4] >> 5)]
+ key[c[4] & 0x1f];
}
switch (leftover) {
case 1:
return ret.slice(0, -6) + "======";
case 2:
return ret.slice(0, -4) + "====";
case 3:
return ret.slice(0, -3) + "===";
case 4:
return ret.slice(0, -1) + "=";
default:
return ret;
}
},
/**
* Turn RFC 4648 base32 into our own user-friendly version.
* ABCDEFGHIJKLMNOPQRSTUVWXYZ234567
* becomes
* abcdefghijk8mn9pqrstuvwxyz234567
*/
base32ToFriendly: function base32ToFriendly(input) {
return input.toLowerCase()
.replace("l", '8', "g")
.replace("o", '9', "g");
},
base32FromFriendly: function base32FromFriendly(input) {
return input.toUpperCase()
.replace("8", 'L', "g")
.replace("9", 'O', "g");
},
/**
* Key manipulation.
*/
// Return an octet string in friendly base32 *with no trailing =*.
encodeKeyBase32: function encodeKeyBase32(keyData) {
return Utils.base32ToFriendly(
Utils.encodeBase32(keyData))
.slice(0, SYNC_KEY_ENCODED_LENGTH);
},
decodeKeyBase32: function decodeKeyBase32(encoded) {
return Utils.decodeBase32(
Utils.base32FromFriendly(
Utils.normalizePassphrase(encoded)))
.slice(0, SYNC_KEY_DECODED_LENGTH);
},
base64Key: function base64Key(keyData) {
return btoa(keyData);
},
deriveKeyFromPassphrase: function deriveKeyFromPassphrase(passphrase, salt, keyLength, forceJS) {
if (Svc.Crypto.deriveKeyFromPassphrase && !forceJS) {
return Svc.Crypto.deriveKeyFromPassphrase(passphrase, salt, keyLength);
}
else {
// Fall back to JS implementation.
// 4096 is hardcoded in WeaveCrypto, so do so here.
return Utils.pbkdf2Generate(passphrase, atob(salt), 4096, keyLength);
}
},
/**
* N.B., salt should be base64 encoded, even though we have to decode
* it later!
*/
derivePresentableKeyFromPassphrase : function derivePresentableKeyFromPassphrase(passphrase, salt, keyLength, forceJS) {
let k = Utils.deriveKeyFromPassphrase(passphrase, salt, keyLength, forceJS);
return Utils.encodeKeyBase32(k);
},
/**
* N.B., salt should be base64 encoded, even though we have to decode
* it later!
*/
deriveEncodedKeyFromPassphrase : function deriveEncodedKeyFromPassphrase(passphrase, salt, keyLength, forceJS) {
let k = Utils.deriveKeyFromPassphrase(passphrase, salt, keyLength, forceJS);
return Utils.base64Key(k);
},
/**
* Take a base64-encoded 128-bit AES key, returning it as five groups of five
* uppercase alphanumeric characters, separated by hyphens.
* A.K.A. base64-to-base32 encoding.
*/
presentEncodedKeyAsSyncKey : function presentEncodedKeyAsSyncKey(encodedKey) {
return Utils.encodeKeyBase32(atob(encodedKey));
},
makeURI: function Weave_makeURI(URIString) {
if (!URIString)
return null;
try {
return Services.io.newURI(URIString, null, null);
} catch (e) {
let log = Log4Moz.repository.getLogger("Sync.Utils");
log.debug("Could not create URI: " + Utils.exceptionStr(e));
return null;
}
},
makeURL: function Weave_makeURL(URIString) {
let url = Utils.makeURI(URIString);
url.QueryInterface(Ci.nsIURL);
return url;
},
/**
* Load a json object from disk
*
* @param filePath
* Json file path load from weave/[filePath].json
* @param that
* Object to use for logging and "this" for callback
* @param callback
* Function to process json object as its first parameter
*/
jsonLoad: function Utils_jsonLoad(filePath, that, callback) {
filePath = "weave/" + filePath + ".json";
if (that._log)
that._log.trace("Loading json from disk: " + filePath);
let file = Utils.getProfileFile(filePath);
if (!file.exists()) {
callback.call(that);
return;
}
let channel = NetUtil.newChannel(file);
channel.contentType = "application/json";
NetUtil.asyncFetch(channel, function (is, result) {
if (!Components.isSuccessCode(result)) {
callback.call(that);
return;
}
let string = NetUtil.readInputStreamToString(is, is.available());
is.close();
let json;
try {
json = JSON.parse(string);
} catch (ex) {
if (that._log)
that._log.debug("Failed to load json: " + Utils.exceptionStr(ex));
}
callback.call(that, json);
});
},
/**
* Save a json-able object to disk
*
* @param filePath
* Json file path save to weave/[filePath].json
* @param that
* Object to use for logging and "this" for callback
* @param obj
* Function to provide json-able object to save. If this isn't a
* function, it'll be used as the object to make a json string.
* @param callback
* Function called when the write has been performed. Optional.
*/
jsonSave: function Utils_jsonSave(filePath, that, obj, callback) {
filePath = "weave/" + filePath + ".json";
if (that._log)
that._log.trace("Saving json to disk: " + filePath);
let file = Utils.getProfileFile(filePath);
let json = typeof obj == "function" ? obj.call(that) : obj;
let out = JSON.stringify(json);
let fos = FileUtils.openSafeFileOutputStream(file);
let is = this._utf8Converter.convertToInputStream(out);
NetUtil.asyncCopy(is, fos, function (result) {
if (typeof callback == "function") {
callback.call(that);
}
});
},
/**
* Execute a function on the next event loop tick.
*
* @param callback
* Function to invoke.
* @param thisObj [optional]
* Object to bind the callback to.
*/
nextTick: function nextTick(callback, thisObj) {
if (thisObj) {
callback = callback.bind(thisObj);
}
Services.tm.currentThread.dispatch(callback, Ci.nsIThread.DISPATCH_NORMAL);
},
/**
* Return a timer that is scheduled to call the callback after waiting the
* provided time or as soon as possible. The timer will be set as a property
* of the provided object with the given timer name.
*/
namedTimer: function delay(callback, wait, thisObj, name) {
if (!thisObj || !name) {
throw "You must provide both an object and a property name for the timer!";
}
// Delay an existing timer if it exists
if (name in thisObj && thisObj[name] instanceof Ci.nsITimer) {
thisObj[name].delay = wait;
return;
}
// Create a special timer that we can add extra properties
let timer = {};
timer.__proto__ = Cc["@mozilla.org/timer;1"].createInstance(Ci.nsITimer);
// Provide an easy way to clear out the timer
timer.clear = function() {
thisObj[name] = null;
timer.cancel();
};
// Initialize the timer with a smart callback
timer.initWithCallback({
notify: function notify() {
// Clear out the timer once it's been triggered
timer.clear();
callback.call(thisObj, timer);
}
}, wait, timer.TYPE_ONE_SHOT);
return thisObj[name] = timer;
},
getIcon: function(iconUri, defaultIcon) {
try {
let iconURI = Utils.makeURI(iconUri);
return PlacesUtils.favicons.getFaviconLinkForIcon(iconURI).spec;
}
catch(ex) {}
// Just give the provided default icon or the system's default
return defaultIcon || PlacesUtils.favicons.defaultFavicon.spec;
},
getErrorString: function Utils_getErrorString(error, args) {
try {
return Str.errors.get(error, args || null);
} catch (e) {}
// basically returns "Unknown Error"
return Str.errors.get("error.reason.unknown");
},
encodeUTF8: function(str) {
try {
str = this._utf8Converter.ConvertFromUnicode(str);
return str + this._utf8Converter.Finish();
} catch(ex) {
return null;
}
},
decodeUTF8: function(str) {
try {
str = this._utf8Converter.ConvertToUnicode(str);
return str + this._utf8Converter.Finish();
} catch(ex) {
return null;
}
},
/**
* Generate 26 characters.
*/
generatePassphrase: function generatePassphrase() {
// Note that this is a different base32 alphabet to the one we use for
// other tasks. It's lowercase, uses different letters, and needs to be
// decoded with decodeKeyBase32, not just decodeBase32.
return Utils.encodeKeyBase32(Utils.generateRandomBytes(16));
},
/**
* The following are the methods supported for UI use:
*
* * isPassphrase:
* determines whether a string is either a normalized or presentable
* passphrase.
* * hyphenatePassphrase:
* present a normalized passphrase for display. This might actually
* perform work beyond just hyphenation; sorry.
* * hyphenatePartialPassphrase:
* present a fragment of a normalized passphrase for display.
* * normalizePassphrase:
* take a presentable passphrase and reduce it to a normalized
* representation for storage. normalizePassphrase can safely be called
* on normalized input.
* * normalizeAccount:
* take user input for account/username, cleaning up appropriately.
*/
isPassphrase: function(s) {
if (s) {
return /^[abcdefghijkmnpqrstuvwxyz23456789]{26}$/.test(Utils.normalizePassphrase(s));
}
return false;
},
/**
* Hyphenate a passphrase (26 characters) into groups.
* abbbbccccddddeeeeffffggggh
* =>
* a-bbbbc-cccdd-ddeee-effff-ggggh
*/
hyphenatePassphrase: function hyphenatePassphrase(passphrase) {
// For now, these are the same.
return Utils.hyphenatePartialPassphrase(passphrase, true);
},
hyphenatePartialPassphrase: function hyphenatePartialPassphrase(passphrase, omitTrailingDash) {
if (!passphrase)
return null;
// Get the raw data input. Just base32.
let data = passphrase.toLowerCase().replace(/[^abcdefghijkmnpqrstuvwxyz23456789]/g, "");
// This is the neatest way to do this.
if ((data.length == 1) && !omitTrailingDash)
return data + "-";
// Hyphenate it.
let y = data.substr(0,1);
let z = data.substr(1).replace(/(.{1,5})/g, "-$1");
// Correct length? We're done.
if ((z.length == 30) || omitTrailingDash)
return y + z;
// Add a trailing dash if appropriate.
return (y + z.replace(/([^-]{5})$/, "$1-")).substr(0, SYNC_KEY_HYPHENATED_LENGTH);
},
normalizePassphrase: function normalizePassphrase(pp) {
// Short var name... have you seen the lines below?!
// Allow leading and trailing whitespace.
pp = pp.trim().toLowerCase();
// 20-char sync key.
if (pp.length == 23 &&
[5, 11, 17].every(function(i) pp[i] == '-')) {
return pp.slice(0, 5) + pp.slice(6, 11)
+ pp.slice(12, 17) + pp.slice(18, 23);
}
// "Modern" 26-char key.
if (pp.length == 31 &&
[1, 7, 13, 19, 25].every(function(i) pp[i] == '-')) {
return pp.slice(0, 1) + pp.slice(2, 7)
+ pp.slice(8, 13) + pp.slice(14, 19)
+ pp.slice(20, 25) + pp.slice(26, 31);
}
// Something else -- just return.
return pp;
},
normalizeAccount: function normalizeAccount(acc) {
return acc.trim();
},
// WeaveCrypto returns bad base64 strings. Truncate excess padding
// and decode.
// See Bug 562431, comment 4.
safeAtoB: function safeAtoB(b64) {
let len = b64.length;
let over = len % 4;
return over ? atob(b64.substr(0, len - over)) : atob(b64);
},
/**
* Create an array like the first but without elements of the second. Reuse
* arrays if possible.
*/
arraySub: function arraySub(minuend, subtrahend) {
if (!minuend.length || !subtrahend.length)
return minuend;
return minuend.filter(function(i) subtrahend.indexOf(i) == -1);
},
/**
* Build the union of two arrays. Reuse arrays if possible.
*/
arrayUnion: function arrayUnion(foo, bar) {
if (!foo.length)
return bar;
if (!bar.length)
return foo;
return foo.concat(Utils.arraySub(bar, foo));
},
bind2: function Async_bind2(object, method) {
return function innerBind() { return method.apply(object, arguments); };
},
mpLocked: function mpLocked() {
let modules = Cc["@mozilla.org/security/pkcs11moduledb;1"]
.getService(Ci.nsIPKCS11ModuleDB);
let sdrSlot = modules.findSlotByName("");
let status = sdrSlot.status;
let slots = Ci.nsIPKCS11Slot;
if (status == slots.SLOT_READY || status == slots.SLOT_LOGGED_IN
|| status == slots.SLOT_UNINITIALIZED)
return false;
if (status == slots.SLOT_NOT_LOGGED_IN)
return true;
// something wacky happened, pretend MP is locked
return true;
},
// If Master Password is enabled and locked, present a dialog to unlock it.
// Return whether the system is unlocked.
ensureMPUnlocked: function ensureMPUnlocked() {
let sdr = Cc["@mozilla.org/security/sdr;1"]
.getService(Ci.nsISecretDecoderRing);
try {
sdr.encryptString("bacon");
return true;
} catch(e) {}
return false;
},
/**
* Check if the app is ready (not quitting)
*/
checkAppReady: function checkAppReady() {
// Watch for app-quit notification to stop any sync calls
Svc.Obs.add("quit-application", function() {
Utils.checkAppReady = function() {
throw Components.Exception("App. Quitting", Cr.NS_ERROR_ABORT);
};
});
// In the common case, checkAppReady just returns true
return (Utils.checkAppReady = function() true)();
},
/**
* Return a value for a backoff interval. Maximum is eight hours, unless
* Status.backoffInterval is higher.
*
*/
calculateBackoff: function calculateBackoff(attempts, base_interval) {
let backoffInterval = attempts *
(Math.floor(Math.random() * base_interval) +
base_interval);
return Math.max(Math.min(backoffInterval, MAXIMUM_BACKOFF_INTERVAL), Status.backoffInterval);
}
};
XPCOMUtils.defineLazyGetter(Utils, "_utf8Converter", function() {
let converter = Cc["@mozilla.org/intl/scriptableunicodeconverter"]
.createInstance(Ci.nsIScriptableUnicodeConverter);
converter.charset = "UTF-8";
return converter;
});
/*
* Commonly-used services
*/
let Svc = {};
Svc.Prefs = new Preferences(PREFS_BRANCH);
Svc.DefaultPrefs = new Preferences({branch: PREFS_BRANCH, defaultBranch: true});
Svc.Obs = Observers;
let _sessionCID = Services.appinfo.ID == SEAMONKEY_ID ?
"@mozilla.org/suite/sessionstore;1" :
"@mozilla.org/browser/sessionstore;1";
[["Form", "@mozilla.org/satchel/form-history;1", "nsIFormHistory2"],
["Idle", "@mozilla.org/widget/idleservice;1", "nsIIdleService"],
["KeyFactory", "@mozilla.org/security/keyobjectfactory;1", "nsIKeyObjectFactory"],
["Session", _sessionCID, "nsISessionStore"]
].forEach(function([name, contract, iface]) {
XPCOMUtils.defineLazyServiceGetter(Svc, name, contract, iface);
});
// nsIPrivateBrowsingService is not implemented in mobile Firefox.
// Svc.Private should just return undefined in this case instead of throwing.
XPCOMUtils.defineLazyGetter(Svc, "Private", function() {
try {
return Cc["@mozilla.org/privatebrowsing;1"].getService(Ci["nsIPrivateBrowsingService"]);
} catch (e) {
return undefined;
}
});
Svc.__defineGetter__("Crypto", function() {
let cryptoSvc;
let ns = {};
Cu.import("resource://services-crypto/WeaveCrypto.js", ns);
cryptoSvc = new ns.WeaveCrypto();
delete Svc.Crypto;
return Svc.Crypto = cryptoSvc;
});
let Str = {};
["errors", "sync"].forEach(function(lazy) {
XPCOMUtils.defineLazyGetter(Str, lazy, Utils.lazyStrings(lazy));
});
Svc.Obs.add("xpcom-shutdown", function () {
for (let name in Svc)
delete Svc[name];
});
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