add size requirement for banners

files/routes/art_submissions.py

@@ -63,6 +63,11 @@ def submit_art_post(v):
 	file.save(highquality)
 	process_image(highquality, v) #to ensure not malware
 
+	with Image.open(highquality) as i:
+		if i.width != 2000 or i.height != 200:
+			os.remove(highquality)
+			abort(400, "Banners must be 2000x200")
+
 	path = f"files/assets/images/{SITE_NAME}/{entry.location_kind}"
 	if not entry.hashes:
 		for img in os.listdir(path):

files/templates/submit_art.html

@@ -20,6 +20,12 @@
 						</label>
 					</div>
 
+					{% if kind == 'Banner' %}
+						<div class="mt-3 text-danger font-weight-bold">
+							Please make sure your image is 2000x200 px
+						</div>
+					{% endif %}
+
 					<label class="mt-3" for="author">Author</label>
 					<input autocomplete="off" type="text" id="author" class="form-control" name="author" maxlength="30" pattern='[a-zA-Z0-9_\-]{1,30}|\?{3}' placeholder="Required" value="{{username}}" required>