Add upload image method

Author: kylehg

medium/__init__.py

@@ -1,4 +1,5 @@
 # Copyright 2015 A Medium Corporation
+from os.path import basename
 try:
     from urllib.parse import urlencode
 except ImportError:
@@ -88,6 +89,8 @@ def exchange_refresh_token(self, refresh_token):
     def get_current_user(self):
         """Fetch the data for the currently authenticated user.
 
+        Requires the ``basicProfile`` scope.
+
         :returns: A dictionary with the users data ::
 
             {
@@ -104,6 +107,8 @@ def create_post(self, user_id, title, content, content_format, tags=None,
                     canonical_url=None, publish_status=None, license=None):
         """Create a post for the current user.
 
+        Requires the ``publishPost`` scope.
+
         :param str user_id: The application-specific user ID as returned by
             ``get_current_user()``
         :param str title: The title of the post
@@ -156,6 +161,26 @@ def create_post(self, user_id, title, content, content_format, tags=None,
         path = "/v1/users/%s/posts" % user_id
         return self._request("POST", path, json=data)
 
+    def upload_image(self, file_path, content_type):
+        """Upload a local image to Medium for use in a post.
+
+        Requires the ``uploadImage`` scope.
+
+        :param str file_path: The file path of the image
+        :param str content_type: The type of the image. Valid values are
+            ``image/jpeg``, ``image/png``, ``image/gif``, and ``image/tiff``.
+        :returns: A dictionary with the image data ::
+
+            {
+                'url': 'https://cdn-images-1.medium.com/0*dlkfjalksdjfl.jpg',
+                'md5': 'd87e1628ca597d386e8b3e25de3a18b8'
+            }
+        """
+        with open(file_path, "rb") as f:
+            filename = basename(file_path)
+            files = {"image": (filename, f, content_type)}
+            return self._request("POST", "/v1/images", files=files)
+
     def _request_and_set_auth_code(self, data):
         """Request an access token and set it on the current client."""
         result = self._request("POST", "/v1/tokens", form_data=data)
@@ -170,10 +195,7 @@ def _request(self, method, path, json=None, form_data=None, files=None):
             "Accept-Charset": "utf-8",
             "Authorization": "Bearer %s" % self.access_token,
         }
-        if form_data is not None:
-            headers["Content-Type"] = "application/x-www-form-urlencoded"
-        else:
-            headers["Content-Type"] = "application/json"
+
         resp = requests.request(method, url, json=json, data=form_data,
                                 files=files, headers=headers)
         json = resp.json()