server/posts: report duplicate post ID and URL

server/szurubooru/func/posts.py

@@ -20,7 +20,13 @@ class PostAlreadyFeaturedError(errors.ValidationError):
 
 
 class PostAlreadyUploadedError(errors.ValidationError):
-    pass
+    def __init__(self, other_post):
+        super().__init__(
+            'Post already uploaded (%d)' % other_post.post_id,
+            {
+                'otherPostUrl': get_post_content_url(other_post),
+                'otherPostId': other_post.post_id,
+            })
 
 
 class InvalidPostIdError(errors.ValidationError):
@@ -303,8 +309,7 @@ def update_post_content(post, content):
     if other_post \
             and other_post.post_id \
             and other_post.post_id != post.post_id:
-        raise PostAlreadyUploadedError(
-            'Post already uploaded (%d)' % other_post.post_id)
+        raise PostAlreadyUploadedError(other_post)
 
     post.file_size = len(content)
     try:

server/szurubooru/tests/api/test_post_creating.py

@@ -261,6 +261,7 @@ def test_errors_not_spending_ids(
         config_injector, tmpdir, context_factory, read_asset, user_factory):
     config_injector({
         'data_dir': str(tmpdir.mkdir('data')),
+        'data_url': 'example.com',
         'thumbnails': {
             'post_width': 300,
             'post_height': 300,

server/szurubooru/tests/func/test_posts.py

@@ -329,6 +329,7 @@ def test_update_post_content_to_existing_content(
         tmpdir, config_injector, post_factory, read_asset):
     config_injector({
         'data_dir': str(tmpdir.mkdir('data')),
+        'data_url': 'example.com',
         'thumbnails': {
             'post_width': 300,
             'post_height': 300,