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oauth.js
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/*
* Copyright 2008 Netflix, Inc.
*
* Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
// The HMAC-SHA1 signature method calls b64_hmac_sha1, defined by
// http://pajhome.org.uk/crypt/md5/sha1.js
function TWITTERBAR_OAUTH() {
var OAuth; if (OAuth == null) OAuth = {};
OAuth.setProperties = function setProperties(into, from) {
if (into != null && from != null) {
for (var key in from) {
into[key] = from[key];
}
}
return into;
}
OAuth.setProperties(OAuth, // utility functions
{
percentEncode: function percentEncode(s) {
if (s == null) {
return "";
}
if (s instanceof Array) {
var e = "";
for (var i = 0; i < s.length; ++s) {
if (e != "") e += '&';
e += percentEncode(s[i]);
}
return e;
}
s = encodeURIComponent(s);
// Now replace the values which encodeURIComponent doesn't do
// encodeURIComponent ignores: - _ . ! ~ * ' ( )
// OAuth dictates the only ones you can ignore are: - _ . ~
// Source: http://developer.mozilla.org/en/docs/Core_JavaScript_1.5_Reference:Global_Functions:encodeURIComponent
s = s.replace(/\!/g, "%21");
s = s.replace(/\*/g, "%2A");
s = s.replace(/\'/g, "%27");
s = s.replace(/\(/g, "%28");
s = s.replace(/\)/g, "%29");
return s;
}
,
decodePercent: function decodePercent(s) {
if (s != null) {
// Handle application/x-www-form-urlencoded, which is defined by
// http://www.w3.org/TR/html4/interact/forms.html#h-17.13.4.1
s = s.replace(/\+/g, " ");
}
return decodeURIComponent(s);
}
,
/** Convert the given parameters to an Array of name-value pairs. */
getParameterList: function getParameterList(parameters) {
if (parameters == null) {
return [];
}
if (typeof parameters != "object") {
return decodeForm(parameters + "");
}
if (parameters instanceof Array) {
return parameters;
}
var list = [];
for (var p in parameters) {
list.push([p, parameters[p]]);
}
return list;
}
,
/** Convert the given parameters to a map from name to value. */
getParameterMap: function getParameterMap(parameters) {
if (parameters == null) {
return {};
}
if (typeof parameters != "object") {
return getParameterMap(decodeForm(parameters + ""));
}
if (parameters instanceof Array) {
var map = {};
for (var p = 0; p < parameters.length; ++p) {
var key = parameters[p][0];
if (map[key] === undefined) { // first value wins
map[key] = parameters[p][1];
}
}
return map;
}
return parameters;
}
,
getParameter: function getParameter(parameters, name) {
if (parameters instanceof Array) {
for (var p = 0; p < parameters.length; ++p) {
if (parameters[p][0] == name) {
return parameters[p][1]; // first value wins
}
}
} else {
return OAuth.getParameterMap(parameters)[name];
}
return null;
}
,
formEncode: function formEncode(parameters) {
var form = "";
var list = OAuth.getParameterList(parameters);
for (var p = 0; p < list.length; ++p) {
var value = list[p][1];
if (value == null) value = "";
if (form != "") form += '&';
form += OAuth.percentEncode(list[p][0])
+'='+ OAuth.percentEncode(value);
}
return form;
}
,
decodeForm: function decodeForm(form) {
var list = [];
var nvps = form.split('&');
for (var n = 0; n < nvps.length; ++n) {
var nvp = nvps[n];
if (nvp == "") {
continue;
}
var equals = nvp.indexOf('=');
var name;
var value;
if (equals < 0) {
name = OAuth.decodePercent(nvp);
value = null;
} else {
name = OAuth.decodePercent(nvp.substring(0, equals));
value = OAuth.decodePercent(nvp.substring(equals + 1));
}
list.push([name, value]);
}
return list;
}
,
setParameter: function setParameter(message, name, value) {
var parameters = message.parameters;
if (parameters instanceof Array) {
for (var p = 0; p < parameters.length; ++p) {
if (parameters[p][0] == name) {
if (value === undefined) {
parameters.splice(p, 1);
} else {
parameters[p][1] = value;
value = undefined;
}
}
}
if (value !== undefined) {
parameters.push([name, value]);
}
} else {
parameters = OAuth.getParameterMap(parameters);
parameters[name] = value;
message.parameters = parameters;
}
}
,
setParameters: function setParameters(message, parameters) {
var list = OAuth.getParameterList(parameters);
for (var i = 0; i < list.length; ++i) {
OAuth.setParameter(message, list[i][0], list[i][1]);
}
}
,
/** Fill in parameters to help construct a request message.
This function doesn't fill in every parameter.
The accessor object should be like:
{consumerKey:'foo', consumerSecret:'bar', accessorSecret:'nurn', token:'krelm', tokenSecret:'blah'}
The accessorSecret property is optional.
*/
completeRequest: function completeRequest(message, accessor) {
if (message.method == null) {
message.method = "GET";
}
var map = OAuth.getParameterMap(message.parameters);
if (map.oauth_consumer_key == null) {
OAuth.setParameter(message, "oauth_consumer_key", accessor.consumerKey || "");
}
if (map.oauth_token == null && accessor.token != null) {
OAuth.setParameter(message, "oauth_token", accessor.token);
}
if (map.oauth_version == null) {
OAuth.setParameter(message, "oauth_version", "1.0");
}
if (map.oauth_timestamp == null) {
OAuth.setParameter(message, "oauth_timestamp", OAuth.timestamp());
}
if (map.oauth_nonce == null) {
OAuth.setParameter(message, "oauth_nonce", OAuth.nonce(6));
}
OAuth.SignatureMethod.sign(message, accessor);
}
,
setTimestampAndNonce: function setTimestampAndNonce(message) {
OAuth.setParameter(message, "oauth_timestamp", OAuth.timestamp());
OAuth.setParameter(message, "oauth_nonce", OAuth.nonce(6));
}
,
addToURL: function addToURL(url, parameters) {
newURL = url;
if (parameters != null) {
var toAdd = OAuth.formEncode(parameters);
if (toAdd.length > 0) {
var q = url.indexOf('?');
if (q < 0) newURL += '?';
else newURL += '&';
newURL += toAdd;
}
}
return newURL;
}
,
/** Construct the value of the Authorization header for an HTTP request. */
getAuthorizationHeader: function getAuthorizationHeader(realm, parameters) {
var header = 'OAuth realm="' + OAuth.percentEncode(realm) + '"';
var list = OAuth.getParameterList(parameters);
for (var p = 0; p < list.length; ++p) {
var parameter = list[p];
var name = parameter[0];
if (name.indexOf("oauth_") == 0) {
header += ',' + OAuth.percentEncode(name) + '="' + OAuth.percentEncode(parameter[1]) + '"';
}
}
return header;
}
,
timestamp: function timestamp() {
var d = new Date();
return Math.floor(d.getTime()/1000);
}
,
nonce: function nonce(length) {
var chars = OAuth.nonce.CHARS;
var result = "";
for (var i = 0; i < length; ++i) {
var rnum = Math.floor(Math.random() * chars.length);
result += chars.substring(rnum, rnum+1);
}
return result;
}
});
OAuth.nonce.CHARS = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXTZabcdefghiklmnopqrstuvwxyz";
/** Define a constructor function,
without causing trouble to anyone who was using it as a namespace.
That is, if parent[name] already existed and had properties,
copy those properties into the new constructor.
*/
OAuth.declareClass = function declareClass(parent, name, newConstructor) {
var previous = parent[name];
parent[name] = newConstructor;
if (newConstructor != null && previous != null) {
for (var key in previous) {
if (key != "prototype") {
newConstructor[key] = previous[key];
}
}
}
return newConstructor;
}
/** An abstract algorithm for signing messages. */
OAuth.declareClass(OAuth, "SignatureMethod", function OAuthSignatureMethod(){});
OAuth.setProperties(OAuth.SignatureMethod.prototype, // instance members
{
/** Add a signature to the message. */
sign: function sign(message) {
var baseString = OAuth.SignatureMethod.getBaseString(message);
var signature = this.getSignature(baseString);
OAuth.setParameter(message, "oauth_signature", signature);
return signature; // just in case someone's interested
}
,
/** Set the key string for signing. */
initialize: function initialize(name, accessor) {
var consumerSecret;
if (accessor.accessorSecret != null
&& name.length > 9
&& name.substring(name.length-9) == "-Accessor")
{
consumerSecret = accessor.accessorSecret;
} else {
consumerSecret = accessor.consumerSecret;
}
this.key = OAuth.percentEncode(consumerSecret)
+"&"+ OAuth.percentEncode(accessor.tokenSecret);
}
});
/* SignatureMethod expects an accessor object to be like this:
{tokenSecret: "lakjsdflkj...", consumerSecret: "QOUEWRI..", accessorSecret: "xcmvzc..."}
The accessorSecret property is optional.
*/
// Class members:
OAuth.setProperties(OAuth.SignatureMethod, // class members
{
sign: function sign(message, accessor) {
var name = OAuth.getParameterMap(message.parameters).oauth_signature_method;
if (name == null || name == "") {
name = "HMAC-SHA1";
OAuth.setParameter(message, "oauth_signature_method", name);
}
OAuth.SignatureMethod.newMethod(name, accessor).sign(message);
}
,
/** Instantiate a SignatureMethod for the given method name. */
newMethod: function newMethod(name, accessor) {
var impl = OAuth.SignatureMethod.REGISTERED[name];
if (impl != null) {
var method = new impl();
method.initialize(name, accessor);
return method;
}
var err = new Error("signature_method_rejected");
var acceptable = "";
for (var r in OAuth.SignatureMethod.REGISTERED) {
if (acceptable != "") acceptable += '&';
acceptable += OAuth.percentEncode(r);
}
err.oauth_acceptable_signature_methods = acceptable;
throw err;
}
,
/** A map from signature method name to constructor. */
REGISTERED : {}
,
/** Subsequently, the given constructor will be used for the named methods.
The constructor will be called with no parameters.
The resulting object should usually implement getSignature(baseString).
You can easily define such a constructor by calling makeSubclass, below.
*/
registerMethodClass: function registerMethodClass(names, classConstructor) {
for (var n = 0; n < names.length; ++n) {
OAuth.SignatureMethod.REGISTERED[names[n]] = classConstructor;
}
}
,
/** Create a subclass of OAuth.SignatureMethod, with the given getSignature function. */
makeSubclass: function makeSubclass(getSignatureFunction) {
var superClass = OAuth.SignatureMethod;
var subClass = function() {
superClass.call(this);
};
subClass.prototype = new superClass();
// Delete instance variables from prototype:
// delete subclass.prototype... There aren't any.
subClass.prototype.getSignature = getSignatureFunction;
subClass.prototype.constructor = subClass;
return subClass;
}
,
getBaseString: function getBaseString(message) {
var URL = message.action;
var q = URL.indexOf('?');
var parameters;
if (q < 0) {
parameters = message.parameters;
} else {
// Combine the URL query string with the other parameters:
parameters = OAuth.decodeForm(URL.substring(q + 1));
var toAdd = OAuth.getParameterList(message.parameters);
for (var a = 0; a < toAdd.length; ++a) {
parameters.push(toAdd[a]);
}
}
return OAuth.percentEncode(message.method.toUpperCase())
+'&'+ OAuth.percentEncode(OAuth.SignatureMethod.normalizeUrl(URL))
+'&'+ OAuth.percentEncode(OAuth.SignatureMethod.normalizeParameters(parameters));
}
,
normalizeUrl: function normalizeUrl(url) {
var uri = OAuth.SignatureMethod.parseUri(url);
var scheme = uri.protocol.toLowerCase();
var authority = uri.authority.toLowerCase();
var dropPort = (scheme == "http" && uri.port == 80)
|| (scheme == "https" && uri.port == 443);
if (dropPort) {
// find the last : in the authority
var index = authority.lastIndexOf(":");
if (index >= 0) {
authority = authority.substring(0, index);
}
}
var path = uri.path;
if (!path) {
path = "/"; // conforms to RFC 2616 section 3.2.2
}
// we know that there is no query and no fragment here.
return scheme + "://" + authority + path;
}
,
parseUri: function parseUri (str) {
/* This function was adapted from parseUri 1.2.1
http://stevenlevithan.com/demo/parseuri/js/assets/parseuri.js
*/
var o = {key: ["source","protocol","authority","userInfo","user","password","host","port","relative","path","directory","file","query","anchor"],
parser: {strict: /^(?:([^:\/?#]+):)?(?:\/\/((?:(([^:@]*):?([^:@]*))?@)?([^:\/?#]*)(?::(\d*))?))?((((?:[^?#\/]*\/)*)([^?#]*))(?:\?([^#]*))?(?:#(.*))?)/ }};
var m = o.parser.strict.exec(str);
var uri = {};
var i = 14;
while (i--) uri[o.key[i]] = m[i] || "";
return uri;
}
,
normalizeParameters: function normalizeParameters(parameters) {
if (parameters == null) {
return "";
}
var list = OAuth.getParameterList(parameters);
var sortable = [];
for (var p = 0; p < list.length; ++p) {
var nvp = list[p];
if (nvp[0] != "oauth_signature") {
sortable.push([ OAuth.percentEncode(nvp[0])
+ " " // because it comes before any character that can appear in a percentEncoded string.
+ OAuth.percentEncode(nvp[1])
, nvp]);
}
}
sortable.sort(function(a,b) {
if (a[0] < b[0]) return -1;
if (a[0] > b[0]) return 1;
return 0;
});
var sorted = [];
for (var s = 0; s < sortable.length; ++s) {
sorted.push(sortable[s][1]);
}
return OAuth.formEncode(sorted);
}
});
OAuth.SignatureMethod.registerMethodClass(["PLAINTEXT", "PLAINTEXT-Accessor"],
OAuth.SignatureMethod.makeSubclass(
function getSignature(baseString) {
return this.key;
}
));
OAuth.SignatureMethod.registerMethodClass(["HMAC-SHA1", "HMAC-SHA1-Accessor"],
OAuth.SignatureMethod.makeSubclass(
function getSignature(baseString) {
var hexcase = 0; /* hex output format. 0 - lowercase; 1 - uppercase */
var b64pad = "="; /* base-64 pad character. "=" for strict RFC compliance */
var chrsz = 8; /* bits per input character. 8 - ASCII; 16 - Unicode */
/*
* These are the functions you'll usually want to call
* They take string arguments and return either hex or base-64 encoded strings
*/
function hex_sha1(s){return binb2hex(core_sha1(str2binb(s),s.length * chrsz));}
function b64_sha1(s){return binb2b64(core_sha1(str2binb(s),s.length * chrsz));}
function str_sha1(s){return binb2str(core_sha1(str2binb(s),s.length * chrsz));}
function hex_hmac_sha1(key, data){ return binb2hex(core_hmac_sha1(key, data));}
function b64_hmac_sha1(key, data){ return binb2b64(core_hmac_sha1(key, data));}
function str_hmac_sha1(key, data){ return binb2str(core_hmac_sha1(key, data));}
/*
* Perform a simple self-test to see if the VM is working
*/
function sha1_vm_test()
{
return hex_sha1("abc") == "a9993e364706816aba3e25717850c26c9cd0d89d";
}
/*
* Calculate the SHA-1 of an array of big-endian words, and a bit length
*/
function core_sha1(x, len)
{
/* append padding */
x[len >> 5] |= 0x80 << (24 - len % 32);
x[((len + 64 >> 9) << 4) + 15] = len;
var w = Array(80);
var a = 1732584193;
var b = -271733879;
var c = -1732584194;
var d = 271733878;
var e = -1009589776;
for(var i = 0; i < x.length; i += 16)
{
var olda = a;
var oldb = b;
var oldc = c;
var oldd = d;
var olde = e;
for(var j = 0; j < 80; j++)
{
if(j < 16) w[j] = x[i + j];
else w[j] = rol(w[j-3] ^ w[j-8] ^ w[j-14] ^ w[j-16], 1);
var t = safe_add(safe_add(rol(a, 5), sha1_ft(j, b, c, d)),
safe_add(safe_add(e, w[j]), sha1_kt(j)));
e = d;
d = c;
c = rol(b, 30);
b = a;
a = t;
}
a = safe_add(a, olda);
b = safe_add(b, oldb);
c = safe_add(c, oldc);
d = safe_add(d, oldd);
e = safe_add(e, olde);
}
return Array(a, b, c, d, e);
}
/*
* Perform the appropriate triplet combination function for the current
* iteration
*/
function sha1_ft(t, b, c, d)
{
if(t < 20) return (b & c) | ((~b) & d);
if(t < 40) return b ^ c ^ d;
if(t < 60) return (b & c) | (b & d) | (c & d);
return b ^ c ^ d;
}
/*
* Determine the appropriate additive constant for the current iteration
*/
function sha1_kt(t)
{
return (t < 20) ? 1518500249 : (t < 40) ? 1859775393 :
(t < 60) ? -1894007588 : -899497514;
}
/*
* Calculate the HMAC-SHA1 of a key and some data
*/
function core_hmac_sha1(key, data)
{
var bkey = str2binb(key);
if(bkey.length > 16) bkey = core_sha1(bkey, key.length * chrsz);
var ipad = Array(16), opad = Array(16);
for(var i = 0; i < 16; i++)
{
ipad[i] = bkey[i] ^ 0x36363636;
opad[i] = bkey[i] ^ 0x5C5C5C5C;
}
var hash = core_sha1(ipad.concat(str2binb(data)), 512 + data.length * chrsz);
return core_sha1(opad.concat(hash), 512 + 160);
}
/*
* Add integers, wrapping at 2^32. This uses 16-bit operations internally
* to work around bugs in some JS interpreters.
*/
function safe_add(x, y)
{
var lsw = (x & 0xFFFF) + (y & 0xFFFF);
var msw = (x >> 16) + (y >> 16) + (lsw >> 16);
return (msw << 16) | (lsw & 0xFFFF);
}
/*
* Bitwise rotate a 32-bit number to the left.
*/
function rol(num, cnt)
{
return (num << cnt) | (num >>> (32 - cnt));
}
/*
* Convert an 8-bit or 16-bit string to an array of big-endian words
* In 8-bit function, characters >255 have their hi-byte silently ignored.
*/
function str2binb(str)
{
var bin = Array();
var mask = (1 << chrsz) - 1;
for(var i = 0; i < str.length * chrsz; i += chrsz)
bin[i>>5] |= (str.charCodeAt(i / chrsz) & mask) << (32 - chrsz - i%32);
return bin;
}
/*
* Convert an array of big-endian words to a string
*/
function binb2str(bin)
{
var str = "";
var mask = (1 << chrsz) - 1;
for(var i = 0; i < bin.length * 32; i += chrsz)
str += String.fromCharCode((bin[i>>5] >>> (32 - chrsz - i%32)) & mask);
return str;
}
/*
* Convert an array of big-endian words to a hex string.
*/
function binb2hex(binarray)
{
var hex_tab = hexcase ? "0123456789ABCDEF" : "0123456789abcdef";
var str = "";
for(var i = 0; i < binarray.length * 4; i++)
{
str += hex_tab.charAt((binarray[i>>2] >> ((3 - i%4)*8+4)) & 0xF) +
hex_tab.charAt((binarray[i>>2] >> ((3 - i%4)*8 )) & 0xF);
}
return str;
}
/*
* Convert an array of big-endian words to a base-64 string
*/
function binb2b64(binarray)
{
var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
var str = "";
for(var i = 0; i < binarray.length * 4; i += 3)
{
var triplet = (((binarray[i >> 2] >> 8 * (3 - i %4)) & 0xFF) << 16)
| (((binarray[i+1 >> 2] >> 8 * (3 - (i+1)%4)) & 0xFF) << 8 )
| ((binarray[i+2 >> 2] >> 8 * (3 - (i+2)%4)) & 0xFF);
for(var j = 0; j < 4; j++)
{
if(i * 8 + j * 6 > binarray.length * 32) str += b64pad;
else str += tab.charAt((triplet >> 6*(3-j)) & 0x3F);
}
}
return str;
}
return b64_hmac_sha1(this.key, baseString);
}
));
return OAuth;
};