Switch to POST for Commons API call

Avoid crash caused by URL being too long.

depicts/commons.py

@@ -25,7 +25,7 @@ def image_detail(filenames, thumbheight=None, thumbwidth=None):
         call_params = params.copy()
         call_params['titles'] = '|'.join(f'File:{f}' for f in cur)
 
-        r = mediawiki.api_call(call_params, api_url=commons_url)
+        r = mediawiki.api_post(call_params, api_url=commons_url)
 
         for image in r.json()['query']['pages']:
             filename = utils.drop_start(image['title'], 'File:')

depicts/mediawiki.py

@@ -24,6 +24,16 @@ def api_call(params, api_url=wikidata_url):
     r = requests.get(api_url, params=call_params, timeout=5)
     return r
 
+def api_post(params, api_url=wikidata_url):
+    call_params = {
+        'format': 'json',
+        'formatversion': 2,
+        **params,
+    }
+
+    r = requests.post(api_url, data=call_params, timeout=5)
+    return r
+
 def get_list(list_name, **params):
     r = api_call({'action': 'query', 'list': list_name, **params})
     return r.json()['query'][list_name]