Prise en charge des événements FB avec plusieurs imges en slide

src/agenda_culturel/import_tasks/extractor_facebook.py

@@ -23,6 +23,7 @@ class SimpleFacebookEvent:
 
 class FacebookEvent:
     name = "event"
+    # keys corresponds to javascript elements that are containing interesting data
     keys = [
         [
             "start_time_formatted",
@@ -40,17 +41,22 @@ class FacebookEvent:
         ["event_description"],
         ["start_timestamp", "end_timestamp"],
     ]
+    # rules are defined by a sub-key within intersesting data where elements will be find
+    # each pair in the associated list is a key of our model and a path within FB data to
+    # get the corresponding field
     rules = {
-        "event_description": {"description": ["text"]},
-        "cover_media_renderer": {
-            "image_alt": ["cover_photo", "photo", "accessibility_caption"],
-            "image": ["cover_photo", "photo", "full_image", "uri"],
-        },
-        "event_creator": {
-            "event_creator_name": ["name"],
-            "event_creator_url": ["url"],
-        },
-        "event_place": {"event_place_name": ["name"]},
+        "event_description":  [("description", ["text"])],
+        "cover_media_renderer": [
+            ("image_alt", ["cover_photo", "photo", "accessibility_caption"]),
+            ("image", ["cover_photo", "photo", "full_image", "uri"]),
+            ("image", ["cover_media", 0, "full_image", "uri"]),
+            ("image_alt", ["cover_media", 0, "accessibility_caption"]),
+         ],
+        "event_creator":
+            [("event_creator_name", ["name"]),
+             ("event_creator_url", ["url"]),
+            ],
+        "event_place": [("event_place_name", ["name"])],
     }
 
     def __init__(self, *args):
@@ -98,16 +104,15 @@ class FacebookEvent:
                 if k == "comet_neighboring_siblings":
                     self.get_neighbor_events(event[k])
                 elif k in FacebookEvent.rules:
-                    for nk, rule in FacebookEvent.rules[
-                        k
-                    ].items():
+                    for nk, rule in FacebookEvent.rules[k]:
                         error = False
                         c = event[k]
                         for ki in rule:
-                            if c is not None:
+                            if c is not None and ki in c or (isinstance(c, list) and ki < len(c)):
                                 c = c[ki]
                             else:
                                 error = True
+                                break
                         if not error:
                             self.elements[nk] = c
                 else: