PttCodingMan · November 5, 2020 17:50 · Jul 10, 2020 · Jul 10, 2020 · Jul 10, 2020
diff --git a/get_aid_from_url.py b/get_aid_from_url.py
@@ -1,4 +1,4 @@
-def get_aid_from_url(self, url: str) -> (str, str):
+def get_aid_from_url(url: str) -> (str, str):
 
     # from get_aid_from_url in PyPtt
 

diff --git a/get_aid_from_url → get_aid_from_url.py b/get_aid_from_url → get_aid_from_url.py
diff --git a/get_aid_from_url b/get_aid_from_url
@@ -0,0 +1,41 @@
+def get_aid_from_url(self, url: str) -> (str, str):
+
+    # from get_aid_from_url in PyPtt
+
+    # 檢查是否符合 PTT BBS 文章網址格式
+    pattern = re.compile('https://www.ptt.cc/bbs/[-.\w]+/M.[\d]+.A[.\w]*.html')
+    r = pattern.search(url)
+    if r is None:
+        raise ValueError('url must be www.ptt.cc article url')
+
+    # 演算法參考 https://www.ptt.cc/man/C_Chat/DE98/DFF5/DB61/M.1419434423.A.DF0.html
+    # aid 字元表
+    aid_table = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-_'
+
+    board = url[23:]
+    board = board[:board.find('/')]
+
+    temp = url[url.rfind('/') + 1:].split('.')
+    # print(temp)
+
+    id_0 = int(temp[1])  # dec
+
+    aid_0 = ''
+    for _ in range(6):
+        index = id_0 % 64
+        aid_0 = f'{aid_table[index]}{aid_0}'
+        id_0 = int(id_0 / 64)
+
+    if temp[3] != 'html':
+        id_1 = int(temp[3], 16)  # hex
+        aid_1 = ''
+        for _ in range(2):
+            index = id_1 % 64
+            aid_1 = f'{aid_table[index]}{aid_1}'
+            id_1 = int(id_1 / 64)
+    else:
+        aid_1 = '00'
+
+    aid = f'{aid_0}{aid_1}'
+
+    return board, aid