[bellazon] improve 'filename' & 'extension' (#8544)

https://github.com/mikf/gallery-dl/issues/8544#issuecomment-3522617104

- use 'extension' from file URL (except attachments)
- strip everything after the first '.' from non-URL filenames

gallery_dl/extractor/bellazon.py

@@ -62,11 +62,12 @@ class BellazonExtractor(Extractor):
                     data["num_internal"] += 1
                     if not (alt := text.extr(info, ' alt="', '"')) or (
                             alt.startswith("post-") and "_thumb." in alt):
-                        name = url
+                        dc = text.nameext_from_url(url, data.copy())
                     else:
-                        name = text.unescape(alt)
+                        dc = data.copy()
+                        dc["name"] = name = text.unescape(alt)
+                        dc["filename"] = name.partition(".")[0]
 
-                    dc = text.nameext_from_url(name, data.copy())
                     dc["id"] = text.extr(info, 'data-fileid="', '"')
                     if ext := text.extr(info, 'data-fileext="', '"'):
                         dc["extension"] = ext
@@ -75,7 +76,10 @@ class BellazonExtractor(Extractor):
                             dc["id"] = \
                                 url.rpartition("?id=")[2].partition("&")[0]
                         if name := text.extr(info, ">", "<").strip():
-                            text.nameext_from_url(name, dc)
+                            dc["name"] = name = text.unescape(name)
+                            text.nameext_from_name(name, dc)
+                    else:
+                        dc["extension"] = text.ext_from_url(url)
 
                     if url[0] == "/":
                         url = f"https:{url}"

test/results/bellazon.py

@@ -237,6 +237,17 @@ __tests__ = (
     "id"          : "14418097",
 },
 
+{
+    "#url"     : "https://www.bellazon.com/main/topic/4322-candids/page/1066/#comment-3956772",
+    "#comment" : "weird/wrong 'filename' & 'extension' (#8544)",
+    "#class"   : bellazon.BellazonPostExtractor,
+    "#count"   : 16,
+
+    "extension"   : "jpg",
+    "filename"    : r"re:^[^.]+$",
+    "id"          : r"re:^\d+$",
+},
+
 {
     "#url"     : "https://www.bellazon.com/main/topic/57872-millie-brady/",
     "#class"   : bellazon.BellazonThreadExtractor,