implement message sending to channels

libdc/include/dc/api.h

@@ -90,6 +90,12 @@ bool dc_api_create_channel(dc_api_t api, dc_account_t login,
  */
 bool dc_api_get_messages(dc_api_t api, dc_account_t login, dc_channel_t c);
 
+/**
+ * post a message to the given channel
+ */
+bool dc_api_post_message(dc_api_t api, dc_account_t login,
+                         dc_channel_t c, dc_message_t m);
+
 /**
  * Fetch a list of friends of the login account "login". The friends are stored
  * within the login object.

libdc/include/dc/message.h

@@ -10,6 +10,7 @@ struct dc_message_;
 typedef struct dc_message_ *dc_message_t;
 
 dc_message_t dc_message_new(void);
+dc_message_t dc_message_new_content(char const *s, int len);
 dc_message_t dc_message_from_json(json_t *j);
 json_t *dc_message_to_json(dc_message_t m);
 

libdc/include/dc/session.h

@@ -52,6 +52,12 @@ bool dc_session_has_token(dc_session_t s);
  */
 dc_account_t dc_session_me(dc_session_t s);
 
+/**
+ * Return the API handle in use by the session. Do not unref the reference
+ * and if you need it for something else, dc_ref() it yourself.
+ */
+dc_api_t dc_session_api(dc_session_t s);
+
 /**
  * access to the internal account cache
  */