implement channel acking and new messages

libdc/include/dc/api.h

@@ -96,6 +96,13 @@ bool dc_api_get_messages(dc_api_t api, dc_account_t login, dc_channel_t c);
 bool dc_api_post_message(dc_api_t api, dc_account_t login,
                          dc_channel_t c, dc_message_t m);
 
+/**
+ * "ack" a channel, meaning that you have read it its contents. You must provide
+ * a message, so that discord knows which message was the last you read.
+ */
+bool dc_api_channel_ack(dc_api_t api, dc_account_t login,
+                        dc_channel_t c, dc_message_t msg);
+
 /**
  * Fetch a list of friends of the login account "login". The friends are stored
  * within the login object.

libdc/include/dc/channel.h

@@ -67,4 +67,7 @@ void dc_channel_add_messages(dc_channel_t c, dc_message_t *m, size_t s);
 
 bool dc_channel_compare(dc_channel_t a, dc_channel_t b);
 
+bool dc_channel_has_new_messages(dc_channel_t c);
+void dc_channel_mark_read(dc_channel_t c);
+
 #endif

libdc/src/api-channel.c

@@ -2,6 +2,40 @@
 
 #include "internal.h"
 
+bool dc_api_channel_ack(dc_api_t api, dc_account_t login,
+                        dc_channel_t c, dc_message_t m)
+{
+    bool ret = false;
+    char *url = NULL;
+    json_t *reply = NULL, *j = NULL;
+
+    return_if_true(api == NULL || login == NULL ||
+                   c == NULL || m == NULL, false);
+
+    asprintf(&url, "channels/%s/messages/%s/ack",
+             dc_channel_id(c),
+             dc_message_id(m)
+        );
+    goto_if_true(url == NULL, cleanup);
+
+    j = json_object();
+    goto_if_true(j == NULL, cleanup);
+    json_object_set_new(j, "token", json_string(TOKEN(login)));
+
+    reply = dc_api_call_sync(api, "POST", TOKEN(login), url, j);
+    goto_if_true(reply != NULL, cleanup);
+
+    ret = true;
+
+cleanup:
+
+    free(url);
+    json_decref(reply);
+    json_decref(j);
+
+    return ret;
+}
+
 bool dc_api_post_message(dc_api_t api, dc_account_t login,
                          dc_channel_t c, dc_message_t m)
 {

libdc/src/channel.c

@@ -46,6 +46,7 @@ struct dc_channel_
 
     GHashTable *messages_byid;
     GPtrArray *messages;
+    bool new_messages;
 };
 
 static void dc_channel_free(dc_channel_t c)
@@ -318,6 +319,8 @@ void dc_channel_add_messages(dc_channel_t c, dc_message_t *m, size_t s)
 
         g_hash_table_insert(c->messages_byid, strdup(id), dc_ref(m[i]));
         g_ptr_array_add(c->messages, dc_ref(m[i]));
+
+        c->new_messages = true;
     }
 
     g_ptr_array_sort(c->messages, (GCompareFunc)dc_message_compare);
@@ -329,3 +332,15 @@ bool dc_channel_compare(dc_channel_t a, dc_channel_t b)
     return_if_true(a->id == NULL || b->id == NULL, false);
     return (strcmp(a->id, b->id) == 0);
 }
+
+bool dc_channel_has_new_messages(dc_channel_t c)
+{
+    return_if_true(c == NULL, false);
+    return c->new_messages;
+}
+
+void dc_channel_mark_read(dc_channel_t c)
+{
+    return_if_true(c == NULL,);
+    c->new_messages = false;
+}