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  • Committer: Scott Ringwelski
  • Date: 2011-02-10 21:30:53 UTC
  • Revision ID: sgringwe@mtu.edu-20110210213053-d3c7mnexeref3cwj
sexy icons, sexy waf

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LastFM.vala
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/** Queries last.fm for information and similar tracks. yay. third try.
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 * @author Scott Ringwelski
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*/
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using Xml;
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public class LastFM.Core : Object {
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        BeatBox.LibraryManager _lm;
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        public static const string api = "a40ea1720028bd40c66b17d7146b3f3b";
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        public static const string secret = "92ba5023f6868e680a3352c71e21243d";
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        public string token;
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        public string session_key;
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        Gee.ArrayList<BeatBox.Song> similar;
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        BeatBox.Song similarToAdd;
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        public Core(BeatBox.LibraryManager lm) {
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                _lm = lm;
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        }
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        /** vala sucks here **/
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        public static string fix_for_url(string fix) {
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                var fix1 = fix.replace(" ", "%20");
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                var fix2 = fix1.replace("!", "%21");
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                var fix3 = fix2.replace("\"","%22");
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                var fix4 = fix3.replace("#", "%23");
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                var fix5 = fix4.replace("$", "%24");
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                var fix6 = fix5.replace("&", "%26");
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                var fix7 = fix6.replace("'", "%27");
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                var fix8 = fix7.replace("(", "%28");
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                var fix9 = fix8.replace(")", "%29");
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                var fix0 = fix9.replace("*", "%2A");
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                return fix0;
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        }
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        public string generate_md5(string text) {
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                return GLib.Checksum.compute_for_string(ChecksumType.MD5, text, text.length);
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        }
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        public string generate_signature(string token, string method) {
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                return generate_md5("api_key" + api + "method" + method + "token" + token + secret);
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        }
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        public string? getToken() {
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                var url = "http://ws.audioscrobbler.com/2.0/?method=auth.gettoken&api_key=" + api;
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                Xml.Doc* doc = Parser.parse_file (url);
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                if(doc == null) return null;
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                Xml.Node* root = doc->get_root_element();
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                if(root == null) return null;
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                for (Xml.Node* iter = root->children; iter != null; iter = iter->next) {
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            if(iter->name == "token") {
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                                return iter->get_content();
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                        }
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                }
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                return null;
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        }
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        public string? getSessionKey(string token) {
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                var url = "http://ws.audioscrobbler.com/2.0/?method=auth.getSession&api_key=" + api + "&api_sig=" + generate_signature(token, "auth.getSession") + "&token=" + token;
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                Xml.Doc* doc = Parser.parse_file (url);
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                if(doc == null) return null;
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                Xml.Node* root = doc->get_root_element();
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                if(root == null) return null;
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                for (Xml.Node* iter = root->children; iter != null; iter = iter->next) {
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            if(iter->name == "session") {
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                                for(Xml.Node* n = iter->children; n != null; n = n->next) {
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                                        if(n->name == "key")
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                                                return n->get_content();
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                                }
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                        }
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                }
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                return null;
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        }
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        public bool loveTrack(string title, string artist) {
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                return false;
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        }
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        public bool banTrack(string title, string artist) {
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                return false;
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        }
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        /** Gets similar songs
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         * @param artist The artist of song to get similar to
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         * @param title The title of song to get similar to
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         * @return The songs that are similar
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         */
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        public Gee.ArrayList<BeatBox.Song> getSimilarTracks(string title, string artist) {
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                var artist_fixed = fix_for_url(artist);
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                var title_fixed = fix_for_url(title);
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                var url = "http://ws.audioscrobbler.com/2.0/?method=track.getsimilar&artist=" + artist_fixed + "&track=" + title_fixed + "&api_key=" + api;
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                Xml.Doc* doc = Parser.parse_file (url);
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                if(doc == null)
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                        stdout.printf("Could not load similar artist information for %s by %s", title, artist);
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                else if(doc->get_root_element() == null)
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                        stdout.printf("Oddly, similar artist information was invalid");
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                else {
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                        //stdout.printf("Getting similar tracks with %s... \n", url);
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                        similar = new Gee.ArrayList<BeatBox.Song>();
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                        similarToAdd = null;
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                        parse_similar_nodes(doc->get_root_element(), "");
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                        return similar;
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                }
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                return new Gee.ArrayList<BeatBox.Song>();
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        }
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        public void parse_similar_nodes(Xml.Node* node, string parent) {
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                for (Xml.Node* iter = node->children; iter != null; iter = iter->next) {
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            if (iter->type != ElementType.ELEMENT_NODE) {
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                continue;
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            }
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            string node_name = iter->name;
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            string node_content = iter->get_content ();
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            if(parent == "similartrackstrack") {
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                                if(node_name == "name") {
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                                        if(similarToAdd != null) {
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                                                similar.add(similarToAdd);
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                                        }
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                                        similarToAdd = new BeatBox.Song("");
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                                        similarToAdd.title = node_content;
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                                }
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                        }
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                        else if(parent == "similartrackstrackartist") {
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                                if(node_name == "name") {
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                                        similarToAdd.artist = node_content;
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                                }
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                        }
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                        parse_similar_nodes(iter, parent+node_name);
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                }
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        }
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}