social.js

/**
 * This is a JavaScript module for Titanium Mobile made by Dawson Toth. I adapted the majority of this code from other
 * authors to make it easy to share content on social sites through a single interface.
 *
 * Example usage: http://appc.me/social.sample.js
 *
 */


//
// We'll start off by defining what's normally included in external files "sha1.js" and "oauth.js".
// To keep things simple, I'm going to define them inline. (If this violates some licenses and someone
// cares enough to sue me, I'll move them to their own files. Sound good?
//
/*
 * A JavaScript implementation of the Secure Hash Algorithm, SHA-1, as defined
 * in FIPS PUB 180-1
 * Version 2.1a Copyright Paul Johnston 2000 - 2002.
 * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
 * Distributed under the BSD License
 * See http://pajhome.org.uk/crypt/md5 for details.
 */

/*
 * Configurable variables. You may need to tweak these to be compatible with
 * the server-side, but the defaults work in most cases.
 */
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;
}

/*
 * 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.
 */

/* Here's some JavaScript software for implementing OAuth.

 This isn't as useful as you might hope. OAuth is based around
 allowing tools and websites to talk to each other. However,
 JavaScript running in web browsers is hampered by security
 restrictions that prevent code running on one website from
 accessing data stored or served on another.

 Before you start hacking, make sure you understand the limitations
 posed by cross-domain XMLHttpRequest.

 On the bright side, some platforms use JavaScript as their
 language, but enable the programmer to access other web sites.
 Examples include Google Gadgets, and Microsoft Vista Sidebar.
 For those platforms, this library should come in handy.
 */

// The HMAC-SHA1 signature method calls b64_hmac_sha1, defined by
// http://pajhome.org.uk/crypt/md5/sha1.js
/* An OAuth message is represented as an object like this:
 {method: "GET", action: "http://server.com/path", parameters: ...}

 The parameters may be either a map {name: value, name2: value2}
 or an Array of name-value pairs [[name, value], [name2, value2]].
 The latter representation is more powerful: it supports parameters
 in a specific sequence, or several parameters with the same name;
 for example [["a", 1], ["b", 2], ["a", 3]].

 Parameter names and values are NOT percent-encoded in an object.
 They must be encoded before transmission and decoded after reception.
 For example, this message object:
 {method: "GET", action: "http://server/path", parameters: {p: "x y"}}
 ... can be transmitted as an HTTP request that begins:
 GET /path?p=x%20y HTTP/1.0
 (This isn't a valid OAuth request, since it lacks a signature etc.)
 Note that the object "x y" is transmitted as x%20y. To encode
 parameters, you can call OAuth.addToURL, OAuth.formEncode or
 OAuth.getAuthorization.

 This message object model harmonizes with the browser object model for
 input elements of an form, whose value property isn't percent encoded.
 The browser encodes each value before transmitting it. For example,
 see consumer.setInputs in example/consumer.js.
 */

/* This script needs to know what time it is. By default, it uses the local
 clock (new Date), which is apt to be inaccurate in browsers. To do
 better, you can load this script from a URL whose query string contains
 an oauth_timestamp parameter, whose value is a current Unix timestamp.
 For example, when generating the enclosing document using PHP:

 <script src="oauth.js?oauth_timestamp=<?=time()?>" ...

 Another option is to call OAuth.correctTimestamp with a Unix timestamp.
 */

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 += OAuth.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 OAuth.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 OAuth.getParameterMap(OAuth.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;
        },
        /** Correct the time using a parameter from the URL from which the last script was loaded. */
        correctTimestampFromSrc: function correctTimestampFromSrc(parameterName) {
            parameterName = parameterName || "oauth_timestamp";
            var scripts = document.getElementsByTagName('script');
            if (scripts == null || !scripts.length) return;
            var src = scripts[scripts.length - 1].src;
            if (!src) return;
            var q = src.indexOf("?");
            if (q < 0) return;
            parameters = OAuth.getParameterMap(OAuth.decodeForm(src.substring(q + 1)));
            var t = parameters[parameterName];
            if (t == null) return;
            OAuth.correctTimestamp(t);
        },
        /** Generate timestamps starting with the given value. */
        correctTimestamp: function correctTimestamp(timestamp) {
            OAuth.timeCorrectionMsec = (timestamp * 1000) - (new Date()).getTime();
        },
        /** The difference between the correct time and my clock. */
        timeCorrectionMsec: 0,
        timestamp: function timestamp() {
            var t = (new Date()).getTime() + OAuth.timeCorrectionMsec;
            return '' + Math.floor(t / 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) {
        b64pad = '=';
        var signature = b64_hmac_sha1(this.key, baseString);
        return signature;
    }));

try {
    OAuth.correctTimestampFromSrc();
} catch (e) {
}


/*
 * ATTENTION: Some efforts has been put in order to produce this code.
 * If you like and use it consider making a dontation in order
 * to allow me to do more and provide you with more solutions.
 *
 * Thanks,
 * David Riccitelli
 *
 * To donate, copy and paste this link in your browser:
 * https://www.paypal.com/cgi-bin/webscr?cmd=_donations&business=T5HUU4J5EQTJU&lc=IT&item_name=OAuth%20Adapter&currency_code=USD&bn=PP%2dDonationsBF%3abtn_donate_LG%2egif%3aNonHosted
 *
 * Copyright 2010 David Riccitelli, Interact SpA
 *
 * 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.
 */
/*
 * This library currently works only with Twitter, although I'd like to
 * spend some more time to make it generally compatible with other services
 * too.
 *
 * Sample use with Twitter:

 // create a new OAuthAdapter instance by passing by your consumer data and signature method
 var oAuthAdapter = new OAuthAdapter(
 'your-consumer-secret',
 'your-consumer-key',
 'HMAC-SHA1');

 // load the access token for the service (if previously saved)
 oAuthAdapter.loadAccessToken('twitter');

 // consume a service API - in this case the status update by Twitter
 oAuthAdapter.send('https://api.twitter.com/1/statuses/update.json', [['status','Hey @ziodave, I managed to use the #oauth adapter for @titanium consuming @twitterapi']],'Twitter','Tweet published.','Tweet not published.');

 // if the client is not authorized, ask for authorization. the previous tweet will be sent automatically after authorization
 if (oAuthAdapter.isAuthorized() == false)
 {
 // this function will be called as soon as the application is authorized
 var receivePin = function() {
 // get the access token with the provided pin/oauth_verifier
 oAuthAdapter.getAccessToken('https://api.twitter.com/oauth/access_token');
 // save the access token
 oAuthAdapter.saveAccessToken('twitter');
 };

 // show the authorization UI and call back the receive PIN function
 oAuthAdapter.showAuthorizeUI('https://api.twitter.com/oauth/authorize?' + oAuthAdapter.getRequestToken('https://api.twitter.com/oauth/request_token'), receivePin);
 }

 */

// create an OAuthAdapter instance
var OAuthAdapter = function (pConsumerSecret, pConsumerKey, pSignatureMethod) {

    Ti.API.info('*********************************************');
    Ti.API.info('If you like the OAuth Adapter, consider donating at');
    Ti.API.info('https://www.paypal.com/cgi-bin/webscr?cmd=_donations&business=T5HUU4J5EQTJU&lc=IT&item_name=OAuth%20Adapter&currency_code=USD&bn=PP%2dDonationsBF%3abtn_donate_LG%2egif%3aNonHosted');
    Ti.API.info('*********************************************');

    // will hold the consumer secret and consumer key as provided by the caller
    var consumerSecret = pConsumerSecret;
    var consumerKey = pConsumerKey;

    // will set the signature method as set by the caller
    var signatureMethod = pSignatureMethod;

    // the pin or oauth_verifier returned by the authorization process window
    var pin = null;

    // will hold the request token and access token returned by the service
    var requestToken = null;
    var requestTokenSecret = null;
    var accessToken = null;
    var accessTokenSecret = null;

    // the accessor is used when communicating with the OAuth libraries to sign the messages
    var accessor = {
        consumerSecret: consumerSecret,
        tokenSecret: ''
    };

    // will hold UI components
    var window = null;
    var view = null;
    var webView = null;
    var loadingView = null;
    var loadingContainer = null;
    var receivePinCallback = null;

    var accessTokenStore = {};

    this.loadAccessToken = function (pService) {
        var token;
        if (accessTokenStore[pService]) {
            token = accessTokenStore[pService];
        }
        else {
            var raw = Ti.App.Properties.getString('Social.js-AccessToken-' + pService, '');
            if (!raw) {
                return;
            }

            try {
                token = accessTokenStore[pService] = JSON.parse(raw);
            }
            catch (err) {
                Ti.API.error('Failed to parse stored access token for ' + pService + '!');
                Ti.API.error(err);
                return;
            }
        }

        if (token.accessToken)
            accessToken = token.accessToken;
        if (token.accessTokenSecret)
            accessTokenSecret = token.accessTokenSecret;
    };
    this.saveAccessToken = function (pService) {
        accessTokenStore[pService] = {
            accessToken: accessToken,
            accessTokenSecret: accessTokenSecret
        };
        Ti.App.Properties.setString('Social.js-AccessToken-' + pService, JSON.stringify(accessTokenStore[pService]));
    };
    this.clearAccessToken = function (pService) {
        delete accessTokenStore[pService];
        Ti.App.Properties.setString('Social.js-AccessToken-' + pService, null);
        accessToken = null;
        accessTokenSecret = null;
    };

    // will tell if the consumer is authorized
    this.isAuthorized = function () {
        return !(accessToken == null || accessTokenSecret == null);
    };

    // creates a message to send to the service
    var createMessage = function (pUrl) {
        var message = {
            action: pUrl,
            method: 'POST',
            parameters: []
        };
        message.parameters.push(['oauth_consumer_key', consumerKey]);
        message.parameters.push(['oauth_signature_method', signatureMethod]);
        return message;
    };

    // returns the pin
    this.getPin = function () {
        return pin;
    };

    // requests a requet token with the given Url
    this.getRequestToken = function (pUrl, callback) {
        accessor.tokenSecret = '';

        var message = createMessage(pUrl);
        OAuth.setTimestampAndNonce(message);
        OAuth.SignatureMethod.sign(message, accessor);

        var done = false;
        var client = Ti.Network.createHTTPClient({
            onload: function () {
                var responseParams = OAuth.getParameterMap(this.responseText);
                requestToken = responseParams['oauth_token'];
                requestTokenSecret = responseParams['oauth_token_secret'];
                callback({ success: true, token: this.responseText });
                done = true;
            },
            onerror: function () {
                Ti.API.error('Social.js: FAILED to getRequestToken!');
                Ti.API.error(this.responseText);
                callback({ success: false });
                done = true;
            }
        });
        client.open('POST', pUrl);
        client.send(OAuth.getParameterMap(message.parameters));
    };

    // unloads the UI used to have the user authorize the application
    var destroyAuthorizeUI = function () {
        // if the window doesn't exist, exit
        if (window == null)
            return;

        // remove the UI
        try {
            webView.removeEventListener('load', authorizeUICallback);
            webView.removeEventListener('beforeload', showLoading);
            loadingView.hide();
            window.close();
            loading = null;
            webView = null;
            loadingView = null;
            loading = false;
            firstLoad = true;
            view = null;
            window = null;
        }
        catch (ex) {
            Ti.API.debug('Cannot destroy the authorize UI. Ignoring.');
        }
    };

    var firstLoad = true;
    var loading = false;
    var estimates = JSON.parse(Ti.App.Properties.getString('Social-LoadingEstimates', '{}'));
    var estimateID;
    var startTime;
    var intervalID = 0;

    function showLoading() {
        if (loading)
            return;
        loading = true;
        loadingView.value = 0;
        estimateID = firstLoad ? 'tokenRequest' : 'pageLoad';
        if (!estimates[estimateID]) {
            estimates[estimateID] = firstLoad ? 2000 : 1000;
        }
        firstLoad = false;
        startTime = new Date().getTime();
        intervalID = setInterval(updateProgress, 30);
        webView && webView.hide();
        loadingView && loadingView.show();
        loadingContainer && loadingContainer.show();
    }

    function updateProgress() {
        loadingView && (loadingView.value = (new Date().getTime() - startTime) / estimates[estimateID]);
    }

    function authorizeUICallback(e) {
        var response = e.source.evalJS('(p = document.getElementById("oauth_pin")) && p.innerHTML;');
        if (response) {
            pin = response.split('<code>')[1].split('</code>')[0];
            destroyAuthorizeUI();
            receivePinCallback();
        }
        else {
            loadingView && loadingView.hide();
            loadingContainer && loadingContainer.hide();
            webView && webView.show();
        }
        loading = false;
        clearInterval(intervalID);
        estimates[estimateID] = new Date().getTime() - startTime;
        Ti.App.Properties.setString('Social-LoadingEstimates', JSON.stringify(estimates));
    }

    this.showLoadingUI = function () {
        window = Ti.UI.createWindow({
            backgroundColor: 'transparent'
        });
        if (!Ti.Android) {
            window.opacity = 0;
            window.transform = Ti.UI.create2DMatrix().scale(0);
        }
        view = Ti.UI.createView({
            top: 10, right: 10, bottom: 10, left: 10,
            backgroundColor: '#52D3FE',
            border: 10,
            borderColor: '#52D3FE', borderRadius: 10, borderWidth: 4,
            zIndex: -1
        });
        var closeLabel = Ti.UI.createButton({
            font: { fontSize: 11, fontWeight: 'bold' },
            backgroundColor: '#52D3FE',
            borderColor: '#52D3FE',
            color: '#fff',
            style: 0,
            borderRadius: 6,
            title: 'X',
            top: 8, right: 8,
            width: 30, height: 30
        });
        closeLabel.addEventListener('click', destroyAuthorizeUI);
        window.open();
        
        var offset = 0;
        if (Ti.Android) {
            offset = '10dp';
        }

        loadingContainer = Ti.UI.createView({
            top: offset, right: offset, bottom: offset, left: offset,
        	backgroundColor: '#fff'
        });
        loadingView = Ti.UI.createProgressBar({
            top: 10, right: 10, bottom: 10, left: 10,
            min: 0, max: 1, value: 0.5,
            message: 'Loading, please wait.',
            backgroundColor: '#fff',
            font: { fontSize: 14, fontWeight: 'bold' },
            style: 0
        });
        view.add(loadingContainer);
        loadingContainer.add(loadingView);
        loadingView.show();

        window.add(view);
        window.add(closeLabel);

        if (!Ti.Android) {
            var tooBig = Ti.UI.createAnimation({
                transform: Ti.UI.create2DMatrix().scale(1.1),
                opacity: 1,
                duration: 350
            });
            var shrinkBack = Ti.UI.createAnimation({
                transform: Ti.UI.create2DMatrix(),
                duration: 400
            });
            tooBig.addEventListener('complete', function () {
                window.animate(shrinkBack);
            });
            window.animate(tooBig);
        }
        // Kick off the timer.
        showLoading();
    };

    // shows the authorization UI
    this.showAuthorizeUI = function (pUrl, pReceivePinCallback) {
        receivePinCallback = pReceivePinCallback;

        var offset = 0;
        if (Ti.Android) {
            offset = '10dp';
        }
        webView = Ti.UI.createWebView({
            url: pUrl,
            top: offset, right: offset, bottom: offset, left: offset,
            autoDetect: [ Ti.UI.AUTODETECT_NONE ]
        });
        webView.addEventListener('beforeload', showLoading);
        webView.addEventListener('load', authorizeUICallback);
        view.add(webView);
    };

    this.getAccessToken = function (pUrl, callback) {
        accessor.tokenSecret = requestTokenSecret;

        var message = createMessage(pUrl);
        message.parameters.push(['oauth_token', requestToken]);
        message.parameters.push(['oauth_verifier', pin]);

        OAuth.setTimestampAndNonce(message);
        OAuth.SignatureMethod.sign(message, accessor);

        var parameterMap = OAuth.getParameterMap(message.parameters);
        var client = Ti.Network.createHTTPClient({
            onload: function () {
                var responseParams = OAuth.getParameterMap(this.responseText);
                accessToken = responseParams['oauth_token'];
                accessTokenSecret = responseParams['oauth_token_secret'];
                callback({ success: true });
            },
            onerror: function () {
                Ti.API.error('Social.js: FAILED to getAccessToken!');
                Ti.API.error(this.responseText);
                callback({ success: false });
            }
        });
        client.open('POST', pUrl);
        client.send(parameterMap);

    };

    this.send = function (options, callback) {
        var pUrl = options.url,
            pParameters = options.parameters,
            pTitle = options.title,
            pSuccessMessage = options.onSuccess,
            pErrorMessage = options.onError;

        if (accessToken == null || accessTokenSecret == null) {

            Ti.API.debug('The send status cannot be processed as the client doesn\'t have an access token. Authorize before trying to send.');
            return;
        }

        accessor.tokenSecret = accessTokenSecret;

        var message = createMessage(pUrl);
        message.parameters.push(['oauth_token', accessToken]);
        for (p in pParameters) message.parameters.push(pParameters[p]);
        OAuth.setTimestampAndNonce(message);
        OAuth.SignatureMethod.sign(message, accessor);

        var parameterMap = OAuth.getParameterMap(message.parameters);
        var client = Ti.Network.createHTTPClient({
            onload: function () {
                if (client.status == 200) {
                    pSuccessMessage && pSuccessMessage(this.responseText);
                } else {
                    pErrorMessage && pErrorMessage(this.responseText);
                }
            },
            onerror: function () {
                Ti.API.error('Social.js: FAILED to send a request!');
                pErrorMessage && pErrorMessage(this.responseText);
            }
        });
        client.open('POST', pUrl);
        client.send(parameterMap);
    };

};


var supportedSites = {
    twitter: {
        accessToken: 'https://api.twitter.com/oauth/access_token',
        requestToken: 'https://api.twitter.com/oauth/request_token',
        authorize: 'https://api.twitter.com/oauth/authorize?',
        update: 'https://api.twitter.com/1.1/statuses/update.json'
    }
};

/**
 * Initializes the module with the passed in settings.
 * @param settings A dictionary containing "consumerKey", "consumerSecret", and "site". "site" defaults to Twitter.
 * @returns An object that can be used to share with the created site.
 */
exports.create = function (settings) {

    var site = (settings.site || 'twitter').toLowerCase();

    var adapter = new OAuthAdapter(settings.consumerSecret, settings.consumerKey, 'HMAC-SHA1');
    adapter.loadAccessToken(site);

    var urls = supportedSites[site];
    if (urls == null) {
        alert('The Social.js module does not support ' + site + ' yet!');
        return null;
    }

    // And return the site to the user.
    return {
        isAuthorized: function () {
            return adapter.isAuthorized();
        },
        deauthorize: function () {
            adapter.clearAccessToken(site);
        },
        authorize: function (callback) {
            if (!adapter.isAuthorized()) {
                function receivePin() {
                    adapter.getAccessToken(urls.accessToken, function (evt) {
                        if (!evt.success) {
                            alert('Twitter did not give us an access token!');
                        }
                        else {
                            adapter.saveAccessToken(site);
                            callback && callback();
                        }
                    });
                }

                adapter.showLoadingUI();
                adapter.getRequestToken(urls.requestToken, function (evt) {
                    if (!evt.success) {
                        alert('Twitter did not give us a request token!');
                    }
                    else {
                        adapter.showAuthorizeUI(urls.authorize + evt.token, receivePin);
                    }
                });
            }
            else {
                callback && callback();
            }
        },
        share: function (options) {
            this.authorize(function () {
                adapter.send({
                    url: urls.update,
                    parameters: [
                        ['status', options.message]
                    ],
                    title: 'Twitter',
                    onSuccess: options.success,
                    onError: options.error
                });
            });
        }
    };
};