fix: validate length of each tag

js/tag_input.js

@@ -89,6 +89,8 @@ class TagsInput {
             this.inputNode.value = ''
             this.updateHiddenInputValue();
 
+            evt.preventDefault();
+        } else if (evt.key !== 'Backspace' && tagValue.length > 255) { // This could be improved to check if it would actually result in a new char being typed...
             evt.preventDefault();
         }
     }

public/assets/bundle/archive.js

@@ -397,6 +397,8 @@ class TagsInput {
             this.inputNode.value = '';
             this.updateHiddenInputValue();
 
+            evt.preventDefault();
+        } else if (evt.key !== 'Backspace' && tagValue.length > 255) { // This could be improved to check if it would actually result in a new char being typed...
             evt.preventDefault();
         }
     }

public/assets/bundle/generic.js

@@ -128,6 +128,8 @@ class TagsInput {
             this.inputNode.value = '';
             this.updateHiddenInputValue();
 
+            evt.preventDefault();
+        } else if (evt.key !== 'Backspace' && tagValue.length > 255) { // This could be improved to check if it would actually result in a new char being typed...
             evt.preventDefault();
         }
     }

public/assets/bundle/user_profile.js

@@ -397,6 +397,8 @@ class TagsInput {
             this.inputNode.value = '';
             this.updateHiddenInputValue();
 
+            evt.preventDefault();
+        } else if (evt.key !== 'Backspace' && tagValue.length > 255) { // This could be improved to check if it would actually result in a new char being typed...
             evt.preventDefault();
         }
     }

public/index.php

@@ -96,6 +96,13 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
         goto OutPut;
     }
 
+    foreach ($tags as $tag) {
+        if (strlen($tag) > 255) {
+            $error = 'A single tag cannot be longer than 255 characters.';
+            goto OutPut;
+        }
+    }
+
     $editing = isset($_POST['edit']);
 
     $paste_title = trim($_POST['title']);