From 6baa178ee249fde9b660e91c6d6cc374b3d755ac Mon Sep 17 00:00:00 2001
From: Carl Worth <cworth@cworth.org>
Date: Thu, 11 Jun 2020 17:08:02 -0700
Subject: [PATCH 1/1] Add clean support for rejecting categories that are too
 large

This is clean in the sense that it prints a message if the server
rejects the submission, but before that it will even do the nice thing
of checking the number on the client side, (and reporting this with
the HTML5 validity API).
---
 empathy/empathy.jsx | 35 ++++++++++++++++++++++++++++++-----
 1 file changed, 30 insertions(+), 5 deletions(-)

diff --git a/empathy/empathy.jsx b/empathy/empathy.jsx
index fcfea4d..3d70345 100644
--- a/empathy/empathy.jsx
+++ b/empathy/empathy.jsx
@@ -1,3 +1,5 @@
+const MAX_PROMPT_ITEMS = 20;
+
 function undisplay(element) {
   element.style.display="none";
 }
@@ -185,11 +187,15 @@ class CategoryRequest extends React.PureComponent {
     const category_input = this.category.current;
     const category = category_input.value;
 
-    if (/[0-9]/.test(category))
-      category_input.setCustomValidity("");
+    const match = category.match(/[0-9]+/);
+    if (match) {
+      const num_items = parseInt(match[0], 10);
+      if (num_items <= MAX_PROMPT_ITEMS)
+        category_input.setCustomValidity("");
+    }
   }
 
-  handle_submit(event) {
+  async handle_submit(event) {
     const form = event.currentTarget;
     const category_input = this.category.current;
     const category = category_input.value;
@@ -204,11 +210,30 @@ class CategoryRequest extends React.PureComponent {
       return;
     }
 
-    fetch_post_json("prompts", {
-      items: parseInt(match[0], 10),
+    const num_items = parseInt(match[0], 10);
+
+    if (num_items > MAX_PROMPT_ITEMS) {
+      category_input.setCustomValidity(`Maximum number of items is ${MAX_PROMPT_ITEMS}`);
+      form.reportValidity();
+      return;
+    }
+
+    const response = await fetch_post_json("prompts", {
+      items: num_items,
       prompt: category
     });
 
+    if (response.status === 200) {
+      const result = await response.json();
+      console.log(result);
+      if (! result.valid) {
+        add_message("danger", result.message);
+        return;
+      }
+    } else {
+      add_message("danger", "An error occurred submitting your category");
+    }
+
     form.reset();
   }
 
-- 
2.43.0