Wikipedia.js

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Components.utils.import("resource://gre/modules/XPCOMUtils.jsm");
Components.utils.import("resource://app/jsmodules/sbLibraryUtils.jsm");
Components.utils.import("resource://app/jsmodules/sbProperties.jsm");

const Cc = Components.classes;
const Ci = Components.interfaces;
const Cr = Components.results;
var JSON = Cc["@mozilla.org/dom/json;1"].createInstance(Ci.nsIJSON);

const DESCRIPTION = "mashTape Provider: Wikipedia Artist Info Provider";
const CID         = "{a7780910-8c10-11dd-ad8b-0800200c9a66}";
const CONTRACTID  = "@songbirdnest.com/mashTape/provider/info/WikipediaLocal;1";

var language;
var homepage;
var wikipedia;

// XPCOM constructor for our Artist Info mashTape provider
function ArtistInfo() {
    this.wrappedJSObject = this;
    Components.utils.import("resource://mashtape/mtUtils.jsm");

    if (typeof(language) == "undefined") {
        // Get the user's locale
        var prefBranch = Cc["@mozilla.org/preferences-service;1"]
                .getService(Ci.nsIPrefService).getBranch("general.");
        var locale = prefBranch.getCharPref("useragent.locale");
        language = locale.split(/-/)[0];
        mtUtils.log("Wikipedia", "language set to " + language);
    }
    if (typeof(homepage) == "undefined") {
        // Initialise to English for now
        homepage = "Homepage";
        wikipedia = "Wikipedia";

        if (language == "en")
            return;
        var gtReq = Cc["@mozilla.org/xmlextras/xmlhttprequest;1"]
                .createInstance(Ci.nsIXMLHttpRequest);
        var url = "http://ajax.googleapis.com/ajax/services/language/translate"
            + "?v=1.0&q=Wikipedia%7CHomepage&langpair=en%7C" + language;
        mtUtils.log("Wikipedia", "translate URL: " + url);
        gtReq.open("GET", url, true);
        gtReq.onreadystatechange = function(ev) {
            if (this.readyState != 4)
                return;
            if (this.status != 200)
                return;
            var results = JSON.decode(this.responseText);
            if (results.responseStatus == 200) {
                var text = results.responseData.translatedText.split("|");
                wikipedia = text[0].replace(/^[\s]*/, '').replace(/[\s]*$/, '');
                homepage = text[1].replace(/^[\s]*/, '').replace(/[\s]*$/, '');
                mtUtils.log("Wikipedia", "Homepage: " + homepage);
                mtUtils.log("Wikipedia", "Wikipedia: " + wikipedia);
            }
        }
        gtReq.send(null);
    }
}

ArtistInfo.prototype.constructor = ArtistInfo;
ArtistInfo.prototype = {
    classDescription: DESCRIPTION,
    classID:          Components.ID(CID),
    contractID:       CONTRACTID,
    QueryInterface: XPCOMUtils.generateQI([Ci.sbIMashTapeInfoProvider,
            Ci.sbIMashTapeProvider]),

    providerName: "Wikipedia",
    providerType: "info",
    numSections: 4,
    providerIconBio : "chrome://mashtape/content/tabs/wikipedia.png",
    providerIconDiscography : "chrome://mashtape/content/tabs/wikipedia.png",
    providerIconMembers : "chrome://mashtape/content/tabs/wikipedia.png",
    providerIconTags : "chrome://mashtape/content/tabs/wikipedia.png",
    providerIconLinks : "chrome://mashtape/content/tabs/wikipedia.png",

    query: function(artist, callback) {
        // Initiate the request
        var dbReq = Cc["@mozilla.org/xmlextras/xmlhttprequest;1"]
                .createInstance(Ci.nsIXMLHttpRequest);
        /*
        var url = "http://dbpedia.org:8890/sparql?" +
                "default-graph-uri=http%3A%2F%2Fdbpedia.org" +
                "&query=DESCRIBE+%3Chttp://dbpedia.org/resource/" +
                artist.replace(/ /g, "_") + "%3E&output=xml";
        */
        var url = "http://dbpedia.org/data/" +
            artist.replace(/ /g, "_") + ".rdf";
        mtUtils.log("Wikipedia", "DBpedia URL:" + url);
        var prefBranch = Cc["@mozilla.org/preferences-service;1"]
            .getService(Ci.nsIPrefService).getBranch("extensions.mashTape.");
        var autolocalise = prefBranch.getBoolPref("info.autolocalise");
        if (!autolocalise)
            language = "en";
        dbReq.open("GET", url, true);
        dbReq.onreadystatechange = function(ev) {
            return function(updateFn) {
                if (dbReq.readyState != 4)
                    return;
                if (dbReq.status != 200)
                    return;
                var xmlText = dbReq.responseText.replace(
                        /<\?xml version="1.0" encoding="utf-8" \?>/,
                        "");
                var x = new XML(xmlText);

                // Set our E4X namespaces
                var dbNs = new Namespace("http://dbpedia.org/property/");
                var foafNs = new Namespace("http://xmlns.com/foaf/0.1/");
                var rdfNs = new Namespace(
                                "http://www.w3.org/1999/02/22-rdf-syntax-ns#");
                var xmlNs = new Namespace(
                                "http://www.w3.org/XML/1998/namespace");

                // Links
                var links = new Object;
        var wikiUrl;
                links.provider = "Wikipedia";
                links.links = new Array();
                if (x..foafNs::page.length() >= 1) {
          wikiUrl = x..foafNs::page[0].@rdfNs::resource.toString();
          wikiUrl = wikiUrl.replace("en.wikipedia.org",
                                    language+".wikipedia.org");
                    links.links.push({
                        name: wikipedia,
                        url: wikiUrl
                    });
                }
        links.url = wikiUrl;
                
        /* bug 18865 - commenting this out for now since the schema changed
                var wikiUrl = null;
                var enUrl = null;
                for each (var resource in x..rdfNs::Description) {
                    var child = resource.child(0);
                    if (child.localName() == ("wikipage-" + language)) {
                        wikiUrl = decodeURI(child.@rdfNs::resource);
                        links.links.push({
                            name: wikipedia,
                            url: wikiUrl
                        });
                    } else if (child.localName() == ("page")) {
                        enUrl = decodeURI(child.@rdfNs::resource);
                        links.links.push({
                            name: wikipedia,
                            url: enUrl
                        });
                    }
                }
                if (wikiUrl == null)
                    wikiUrl = enUrl;
                links.url = wikiUrl;
        */
    
                var bio = new Object;
                var bioText = null;
                // Artist bio
                var englishBio = null;
                for each (var bio in x..dbNs::abstract) {
                    var thisLang = bio.@xmlNs::lang.toString();
                    mtUtils.log("Wikipedia", "Language scan: " + thisLang);
                    if (thisLang == language)
                        bioText = bio.toString();
                    if (thisLang == "en")
                        englishBio = bio.toString();
                }
                if (bioText == null)
                    bioText = englishBio;
                if (bioText == null)
                    updateFn.wrappedJSObject.update(CONTRACTID, null, "bio");
                else {
                    bio.provider = "Wikipedia";
                    bio.bioText = bioText;
                    bio.bioUrl = wikiUrl;
                    bio.bioEditUrl = wikiUrl;
                    updateFn.wrappedJSObject.update(CONTRACTID, bio, "bio");
                }

                // Members
                var members = new Object;
                members.provider = "Wikipedia";
                members.url = wikiUrl;
                members.members = new Array();
                if (x..dbNs::currentMembers.length() == 1 &&
                    x..dbNs::currentMembers.@rdfNs::resource.toString() == "")
                {
                    var memberStr = x..dbNs::currentMembers.toString();
                    members.members = memberStr.split(/\n/);
                } else {
                    for each (var memberName in x..dbNs::currentMembers) {
                        var name = memberName.@rdfNs::resource.toString();
                        var uri = name.split(/\//);
                        name = unescape(uri[uri.length-1].replace(/_/g, " "));
                        members.members.push(name);
                    }
                }

            
                var image = x..dbNs::img.@rdfNs::resource.toString();
                if (image == "")
                    updateFn.wrappedJSObject.update(CONTRACTID, null, "photo");
                else {
                    updateFn.wrappedJSObject.update(CONTRACTID, image, "photo");
                }

                if (members.members.length > 0)
                    updateFn.wrappedJSObject.update(CONTRACTID, members,
                        "members");
                else
                    updateFn.wrappedJSObject.update(CONTRACTID, null,
                        "members");

                if (links.links.length > 0)
                    updateFn.wrappedJSObject.update(CONTRACTID, links, "links");
                else
                    updateFn.wrappedJSObject.update(CONTRACTID, null, "links");
            }(callback);
        }
        dbReq.send(null);
    },
}

var components = [ArtistInfo];
function NSGetModule(compMgr, fileSpec) {
    return XPCOMUtils.generateModule([ArtistInfo]);
}