From 179faf0d2cbee41a3eb63df8f07995185d4652e6 Mon Sep 17 00:00:00 2001
From: Rotimi Best <best@classroomio.com>
Date: Fri, 13 Jun 2025 16:56:09 +0100
Subject: [PATCH] fix: katex fetching from the backend

---
 apps/backend/.env.example               |  1 -
 apps/backend/src/routes/course/katex.ts | 21 +++++++--------------
 docker-compose.yaml                     |  1 -
 3 files changed, 7 insertions(+), 16 deletions(-)

diff --git a/apps/backend/.env.example b/apps/backend/.env.example
index 2c9fb028..0f24be11 100644
--- a/apps/backend/.env.example
+++ b/apps/backend/.env.example
@@ -9,7 +9,6 @@ CLOUDFLARE_BUCKET_DOMAIN=
 CLOUDFLARE_ACCESS_KEY=
 CLOUDFLARE_SECRET_ACCESS_KEY=
 CLOUDFLARE_ACCOUNT_ID=
-CLOUDFLARE_BUCKET_ID=
 
 # Email
 SMTP_HOST=
diff --git a/apps/backend/src/routes/course/katex.ts b/apps/backend/src/routes/course/katex.ts
index 15e36ea1..49f8d70e 100644
--- a/apps/backend/src/routes/course/katex.ts
+++ b/apps/backend/src/routes/course/katex.ts
@@ -5,25 +5,18 @@ import { z } from 'zod';
 
 export const katexRouter = new Hono();
 
-const katexSchema = z.object({
-  latex: z.string().min(1),
-  displayMode: z.boolean().optional()
-});
-
-katexRouter.post('/', async (c: Context) => {
+katexRouter.get('/', async (c: Context) => {
   try {
-    const data = await c.req.json();
-    const validatedData = katexSchema.parse(data);
+    const original = c.req.raw.url;
 
-    const html = katex.renderToString(validatedData.latex, {
-      displayMode: validatedData.displayMode ?? false,
+    const latexString = original.split('?')[1].replaceAll('&plus;', '+').replaceAll('&space;', '');
+
+    const html = katex.renderToString(latexString, {
+      output: 'mathml',
       throwOnError: false
     });
 
-    return c.json({
-      success: true,
-      html
-    });
+    return c.html(html);
   } catch (error) {
     if (error instanceof z.ZodError) {
       return c.json(
diff --git a/docker-compose.yaml b/docker-compose.yaml
index 39c861b2..a78b6082 100644
--- a/docker-compose.yaml
+++ b/docker-compose.yaml
@@ -38,7 +38,6 @@ services:
       - CLOUDFLARE_ACCESS_KEY=${CLOUDFLARE_ACCESS_KEY}
       - CLOUDFLARE_SECRET_ACCESS_KEY=${CLOUDFLARE_SECRET_ACCESS_KEY}
       - CLOUDFLARE_ACCOUNT_ID=${CLOUDFLARE_ACCOUNT_ID}
-      - CLOUDFLARE_BUCKET_ID=${CLOUDFLARE_BUCKET_ID}
       # SMTP - Emails
       - SMTP_HOST=${SMTP_HOST}
       - SMTP_USER=${SMTP_USER}