Return error if backend is not able to tell a feed from an entry

[cascardo/atompub.git] / src / backend.c

diff --git a/src/backend.c b/src/backend.c
index 1eb4aeb..d71eb29 100644 (file)
--- a/src/backend.c
+++ b/src/backend.c
@@ -99,11 +99,20 @@ int
 atom_is_feed (AtomCtx *ctx, AtomID *id)
 {
   AtomBackend *backend;
+  AtomError *aerr;
   backend = atom_backend (ctx);
   if (backend && backend->is_feed)
     {
       return backend->is_feed (ctx, id);
     }
+  /* Frontend may make the decision of whether the requested resource is
+   * a feed or not. If it is not able to do so and backend isn't either,
+   * it is an error.
+   */
+  aerr = atom_error_new ();
+  atom_error_code_set (aerr, 404);
+  atom_error_message_set (aerr, "Not Found");
+  atom_error_set (ctx, aerr);
   return 0;
 }
 
@@ -114,6 +123,8 @@ atom_retrieve_feed (AtomCtx *ctx)
   AtomEntry **entries;
   size_t len;
   atom_backend_enumerate_entries (ctx, &entries, &len);
+  if (atom_error_get (ctx) != NULL)
+    return NULL;
   feed = atom_feed_new ();
   atom_feed_entry_append_array (feed, entries, len);
   return feed;
@@ -123,6 +134,7 @@ AtomResource *
 atom_retrieve_resource (AtomCtx *ctx, AtomID *id)
 {
   AtomResource *res;
+  res = NULL;
   if (atom_is_feed (ctx, id))
     {
       AtomFeed *feed;
@@ -132,7 +144,7 @@ atom_retrieve_resource (AtomCtx *ctx, AtomID *id)
       res = atom_resource_new_from_feed (feed);
       atom_feed_delete (feed);
     }
-  else
+  else if (atom_error_get (ctx) != NULL)
     {
       AtomEntry *entry;
       entry = atom_retrieve_entry (ctx, id);