refactor chan.py, update endchan, add doushio

chan/synch_json.py

@@ -0,0 +1,18 @@
+from chan.json import JsonChanHelper
+from post_process import get_links_from_body
+
+
+class SynchJsonChanHelper(JsonChanHelper):
+
+    def item_urls(self, item, board):
+        urls = set()
+
+        if "com" in item and item["com"]:
+            urls.update(get_links_from_body(item["com"]))
+        elif "sub" in item and item["sub"]:
+            urls.update(get_links_from_body(item["sub"]))
+        if "fsize" in item and item["fsize"]:
+            urls.add(self._image_url + self._image_path + item["tim"] + item["ext"])
+
+        return list(urls)
+