feat: add Curl.post()

botlib/curl.py

@@ -48,14 +48,40 @@ class Curl:
                               md5(url.encode()).hexdigest())
 
     @staticmethod
-    def open(url: str, *, headers: Optional[Dict[str, str]] = None) \
-            -> Optional[HTTPResponse]:
+    def _cached_is_recent(fname: str, *, maxAge: int) -> bool:
+        fname = os.path.join(Curl.CACHE_DIR, fname)
+        return os.path.isfile(fname) and FileTime.get(fname) < maxAge
+
+    @staticmethod
+    def _cached_read(
+        conn: Optional[HTTPResponse], fname_data: str, fname_head: str
+    ) -> Optional[TextIO]:
+        fname_data = os.path.join(Curl.CACHE_DIR, fname_data)
+        if conn:
+            os.makedirs(Curl.CACHE_DIR, exist_ok=True)
+            with open(os.path.join(Curl.CACHE_DIR, fname_head), 'w') as fp:
+                fp.write(str(conn.info()).strip())
+            with open(fname_data, 'wb') as fpb:
+                while True:
+                    data = conn.read(8192)  # 1024 Bytes
+                    if not data:
+                        break
+                    fpb.write(data)
+        return open(fname_data) if os.path.isfile(fname_data) else None
+
+    @staticmethod
+    def open(
+        url: str,
+        *,
+        post: Optional[bytes] = None,
+        headers: Optional[Dict[str, str]] = None,
+    ) -> Optional[HTTPResponse]:
         ''' Open a network connection, returl urlopen() result or None. '''
         try:
             head = {'User-Agent': 'Mozilla/5.0'}
             if headers:
                 head.update(headers)
-            return urlopen(Request(url, headers=head))
+            return urlopen(Request(url, data=post, headers=head))
         except Exception as e:
             if isinstance(e, HTTPError) and e.getcode() == 304:
                 # print('Not-Modified: {}'.format(url), file=stderr)
@@ -64,31 +90,48 @@ class Curl:
             return None
 
     @staticmethod
-    def get(url: str, *, cache_only: bool = False) -> Optional[TextIO]:
+    def get(
+        url: str,
+        *,
+        cache_only: bool = False,
+        headers: Optional[Dict[str, str]] = None,
+    ) -> Optional[TextIO]:
         '''
         Returns an already open file pointer.
         You are responsible for closing the file.
         NOTE: `HTML2List.parse` and `Feed2List.parse` will close it for you.
         '''
-        fname = '{}/curl-{}.data'.format(Curl.CACHE_DIR, Curl.url_hash(url))
-        fname_head = fname[:-5] + '.head'
+        fname = 'curl-{}.data'.format(Curl.url_hash(url))
         # If file was created less than 45 sec ago, reuse cached value
-        if cache_only or (os.path.isfile(fname) and FileTime.get(fname) < 45):
-            return open(fname)
+        if cache_only or Curl._cached_is_recent(fname, maxAge=45):
+            return Curl._cached_read(None, fname, '')
 
-        os.makedirs(Curl.CACHE_DIR, exist_ok=True)
-        conn = Curl.open(url, headers=_read_modified_header(fname_head))
-        if conn:
-            with open(fname_head, 'w') as fp:
-                fp.write(str(conn.info()).strip())
-            with open(fname, 'wb') as fpb:
-                while True:
-                    data = conn.read(8192)  # 1024 Bytes
-                    if not data:
-                        break
-                    fpb.write(data)
+        fname_head = fname[:-5] + '.head'
+        head = _read_modified_header(fname_head)
+        if headers:
+            head.update(headers)
+        conn = Curl.open(url, headers=head)
+        return Curl._cached_read(conn, fname, fname_head)
 
-        return open(fname) if os.path.isfile(fname) else None
+    @staticmethod
+    def post(
+        url: str,
+        data: bytes,
+        *,
+        cache_only: bool = False,
+        headers: Optional[Dict[str, str]] = None,
+    ) -> Optional[TextIO]:
+        '''
+        Perform POST operation.
+        Returns an already open file pointer.
+        You are responsible for closing the file.
+        '''
+        fname = 'curl-{}.post.data'.format(Curl.url_hash(url))
+        if cache_only:
+            return Curl._cached_read(None, fname, '')
+
+        conn = Curl.open(url, post=data, headers=headers)
+        return Curl._cached_read(conn, fname, fname[:-5] + '.head')
 
     @staticmethod
     def json(url: str, fallback: Any = None, *, cache_only: bool = False) \