moved youtube logic to the extra module

app/tools/yt.py

@@ -0,0 +1,40 @@
+""" Module for working with YouTube service """
+import re
+import urllib
+from urllib.request import Request
+
+_YT_PATTERN = re.compile(r"https://www.youtube.com/.+(?:v=|\/)([\w-]{11})&?(list=)?([\w-]{34})?.*")
+_YT_VIDEO_PATTERN = re.compile(r"https://r\d+---sn-[\w]{10}-[\w]{3,5}.googlevideo.com/videoplayback?.*")
+
+
+class YouTube:
+    """ Helper class for working with YouTube service. """
+
+    @staticmethod
+    def is_yt_video_link(url):
+        return re.match(_YT_VIDEO_PATTERN, url)
+
+    @staticmethod
+    def get_yt_id(url):
+        """ Returns video id or None """
+        yt = re.search(_YT_PATTERN, url)
+        if yt:
+            return yt.group(1)
+
+    @staticmethod
+    def get_yt_link(video_id):
+        """ Getting link to YouTube video by id.
+
+            returns tuple from the video link and title
+         """
+        headers = {"User-Agent": "Mozilla/5.0"}
+        req = Request("https://youtube.com/get_video_info?video_id={}".format(video_id), headers=headers)
+        with urllib.request.urlopen(req, timeout=2) as resp:
+            data = resp.read().decode('utf-8').split("&")
+            out = {k: v for k, sep, v in (str(d).partition("=") for d in map(urllib.request.unquote, data))}
+            stream_map = out.get("url_encoded_fmt_stream_map", None)
+            if stream_map:
+                s_map = {k: v for k, sep, v in (str(d).partition("=") for d in stream_map.split("&"))}
+                url, title = s_map.get("url", None), out.get("title", None)
+                return urllib.request.unquote(url) if url else "", title.replace("+", " ") if title else ""
+            return "", ""