Add archived chat retriever

pytchat/paramgen/arcparam.py

@@ -0,0 +1,128 @@
+from base64 import urlsafe_b64encode as b64enc
+from functools import reduce
+import calendar, datetime, pytz
+import math
+import random
+import urllib.parse
+
+
+def _gen_vid(video_id):
+    """generate video_id parameter.
+    Parameter
+    ---------
+        video_id : str
+
+    Return
+    ---------
+    byte[] : base64 encoded video_id parameter.
+    """
+    header_magic = b'\x0A\x0F\x1A\x0D\x0A'
+    header_id =  video_id.encode()
+    header_sep_1 = b'\x1A\x13\xEA\xA8\xDD\xB9\x01\x0D\x0A\x0B'
+    header_terminator = b'\x20\x01'
+
+    item = [
+        header_magic,
+        _nval(len(header_id)),
+        header_id,
+        header_sep_1,
+        header_id,
+        header_terminator
+    ]
+
+    return urllib.parse.quote(
+        b64enc(reduce(lambda x, y: x+y, item)).decode()
+    ).encode()
+
+def _nval(val):
+    """convert value to byte array"""
+    if val<0: raise ValueError
+    buf = b''
+    while val >> 7:
+        m = val & 0xFF | 0x80
+        buf += m.to_bytes(1,'big')
+        val >>= 7
+    buf += val.to_bytes(1,'big')
+    return buf
+
+def get(video_id, pos = 0, topchatonly = False):
+    switch_01 = b'\x04' if topchatonly else b'\x01'
+
+
+    if pos<0:
+        raise ValueError('pos is 0 or positive number.')
+    if pos == 0:  
+        times =_nval(1)
+        switch = b'\x04'       
+    else:
+        times =_nval(int(pos*1000000))
+        switch = b'\x03'
+    header_magic= b'\xA2\x9D\xB0\xD3\x04'
+    sep_0       = b'\x1A'
+    vid         = _gen_vid(video_id)
+    time_tag    = b'\x28'
+    timestamp1  = times
+    sep_1       = b'\x30\x00\x38\x00\x40\x00\x48'
+    sep_2       = b'\x52\x1C\x08\x00\x10\x00\x18\x00\x20\x00'
+    chkstr      = b'\x2A\x0E\x73\x74\x61\x74\x69\x63\x63\x68\x65\x63\x6B\x73\x75\x6D\x40'
+    sep_3       = b'\x00\x58\x03\x60'
+    sep_4       = b'\x68\x00\x72\x04\x08'
+    sep_5       = b'\x10\x00\x78\x00'
+
+    body = [
+        sep_0,
+        _nval(len(vid)),
+        vid,
+        time_tag,
+        timestamp1,
+        sep_1,
+        switch,
+        sep_2,
+        chkstr,
+        sep_3,
+        switch_01,
+        sep_4,
+        switch_01,
+        sep_5
+    ]
+
+    body = reduce(lambda x, y: x+y, body)
+    
+    return  urllib.parse.quote(
+                b64enc( header_magic +
+                        _nval(len(body)) +
+                        body
+                ).decode()
+            )
+
+import requests
+import json
+from .. core_multithread.parser import Parser
+if __name__=='__main__':
+    headers = {
+        'user-agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/77.0.3865.120 Safari/537.36'}
+
+    #"sirpY2XUktI"
+    # print(_gen_vid("KeytykF37jY"))
+    param = get("OzBmHAOA2rA",pos = 0)
+    # target = "op2w0wRyGjxDZzhhRFFvTFMyVjVkSGxyUmpNM2Fsa2FFLXFvM2JrQkRRb0xTMlY1ZEhsclJqTTNhbGtnQVElM0QlM0QoATAAOABAAEgEUhwIABAAGAAgACoOc3RhdGljY2hlY2tzdW1AAFgDYAFoAHIECAEQAHgA"
+    print(param)
+    # if param == target:
+    #     print('ok')
+    # else:
+    #     print('ng')
+    #     print(target)
+    #     for i,t in enumerate(target):
+    #         if(param[i]!=t):
+    #             print('^',end = '')
+    #         else:
+    #             print(' ',end = '')
+    url=f"https://www.youtube.com/live_chat_replay/get_live_chat_replay?continuation={param}&pbj=1"
+    print(url)
+    resp = requests.Session().get(url,headers = headers)
+    print(resp)
+    jsn = json.loads(resp.text)
+    print(jsn)
+    parser = Parser()
+    metadata , chatdata = parser.parse(jsn)
+    print(chatdata[0])