added a plugin system for lyrics sources

git-svn-id: https://svn.musicpd.org/ncmpc/branches/tradiaz@5217 09075e82-0dd4-0310-85a5-a0d7c8717e4f

1 files changed, 158 insertions, 0 deletions

diff --git a/plugins/leoslyrics/lyrics_leoslyrics.c b/plugins/leoslyrics/lyrics_leoslyrics.c
new file mode 100644
index 000000000..47aabe10b
--- /dev/null
+++ b/plugins/leoslyrics/lyrics_leoslyrics.c
@@ -0,0 +1,158 @@
+#include "src_lyrics.h"
+#include "easy_download.h"
+#include <expat.h>
+#include <string.h>
+#include "options.h"
+
+#define LEOSLYRICS_SEARCH_URL "http://api.leoslyrics.com/api_search.php?auth=ncmpc&artist=%s&songtitle=%s"
+#define LEOSLYRICS_CONTENT_URL "http://api.leoslyrics.com/api_lyrics.php?auth=ncmpc&hid=%s"
+#define CREDITS "Lyrics provided by www.LeosLyrics.com"
+
+char *hid;
+XML_Parser parser, contentp;
+
+int check_dl_progress(void *clientp, double dltotal, double dlnow,
+                        double ultotal, double ulnow)
+{
+        if(g_timer_elapsed(dltime, NULL) >= options.lyrics_timeout || lock == 4)
+        {	
+                formed_text_init(&lyr_text);
+                return -1;
+        }
+
+        return 0;
+}	
+
+
+
+static void check_content(void *data, const char *name, const char **atts)
+{ 
+        if(strstr(name, "text") != NULL)
+        {
+
+                result |= 16;
+        }
+}
+        
+
+static void check_search_response(void *data, const char *name,
+                 const char **atts)
+{
+        if(strstr(name, "response") != NULL)
+        {
+        result |=2;
+        return;
+        }  
+            
+        if(result & 4)
+        {
+                if(strstr(name, "result") != NULL)
+                {
+                        if(strstr(atts[2], "hid") != NULL)
+                        {
+                                hid = atts[3];
+                        }
+        
+                        if(strstr(atts[2], "exactMatch") != NULL)
+                        {
+                                result |= 8;
+                        }			
+                }
+        }
+                        
+}
+
+static void end_tag(void *data, const char *name)
+{
+  //hmmmmmm		
+}
+
+  static void check_search_success(void *userData, const XML_Char *s, int len)
+    {
+        if(result & 2)	//lets first check whether we're right
+        {		//we don't really want to search in the wrong string
+                if(strstr((char*) s, "SUCCESS"))
+                {
+                result |=4;
+                }
+        }	
+    }
+
+static void fetch_text(void *userData, const XML_Char *s, int len) 
+{
+        if(result & 16)
+        {
+                add_text_line(&lyr_text, s, len); 
+        }
+}
+
+/*int deregister_lyr_leoslyrics ()
+{
+  
+}*/
+
+int check_lyr_leoslyrics(char *artist, char *title, char *url)
+{
+        char url_avail[256];
+
+        //this replacess the whitespaces with '+'
+        g_strdelimit(artist, " ", '+');
+        g_strdelimit(title, " ", '+');
+        
+        //we insert the artist and the title into the url		
+        snprintf(url_avail, 512, LEOSLYRICS_SEARCH_URL, artist, title);
+
+        //download that xml!
+        easy_download_struct lyr_avail = {NULL, 0,-1};	
+        
+        g_timer_start(dltime);
+        if(!easy_download(url_avail, &lyr_avail, check_dl_progress)) return -1;
+        g_timer_stop(dltime);
+
+        //we gotta parse that stuff with expat
+        parser = XML_ParserCreate(NULL);
+        XML_SetUserData(parser, NULL);
+        
+        XML_SetElementHandler(parser, check_search_response, end_tag);
+        XML_SetCharacterDataHandler(parser, check_search_success);
+        XML_Parse(parser, lyr_avail.data, strlen(lyr_avail.data), 0);	
+        XML_ParserFree(parser);	
+
+        if(!(result & 4)) return -1; //check whether lyrics found
+        snprintf(url, 512, LEOSLYRICS_CONTENT_URL, hid);
+
+        return 0;
+}
+
+int get_lyr_leoslyrics(char *artist, char *title)
+{
+        char url_hid[256];
+        if(dltime == NULL) dltime = g_timer_new();
+
+        if(check_lyr_leoslyrics(artist, title, url_hid) != 0) return -1;
+        
+        easy_download_struct lyr_content = {NULL, 0,-1};  
+        g_timer_continue(dltime);		
+        if(!(easy_download(url_hid, &lyr_content, check_dl_progress))) return -1;
+        g_timer_stop(dltime);
+        
+        contentp = XML_ParserCreate(NULL);
+        XML_SetUserData(contentp, NULL);
+        XML_SetElementHandler(contentp, check_content, end_tag);	
+        XML_SetCharacterDataHandler(contentp, fetch_text);
+        XML_Parse(contentp, lyr_content.data, strlen(lyr_content.data), 0);
+        XML_ParserFree(contentp);
+
+        return 0;
+        
+}
+#if SRC_LYR_LEOSLYRICS == plugin
+int register_me (src_lyr *source_descriptor)
+{ 
+  source_descriptor->check_lyr = check_lyr_leoslyrics;
+  source_descriptor->get_lyr = get_lyr_leoslyrics;
+  
+  source_descriptor->name = "Leoslyrics";
+  source_descriptor->description = "powered by http://www.leoslyrics.com";
+}
+#endif