From 9bf40a0aa6633b8fa45b87b1f0439144ef574df9 Mon Sep 17 00:00:00 2001
From: Alexej Wolff <awolff@draug.me>
Date: Thu, 7 May 2026 01:02:55 +0200
Subject: [PATCH] fix: explicit UTF-8 charset everywhere

---
 server/index.js          | 10 +++++-----
 src/services/deepseek.ts | 10 +++++-----
 2 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/server/index.js b/server/index.js
index 366e186..73f3a25 100644
--- a/server/index.js
+++ b/server/index.js
@@ -1217,7 +1217,7 @@ app.post("/api/deepseek/chat", requireAuth, async (req, res) => {
     const response = await fetch(DEEPSEEK_API_URL, {
       method: "POST",
       headers: {
-        "Content-Type": "application/json",
+        "Content-Type": "application/json; charset=utf-8",
         Authorization: `Bearer ${apiKey}`,
       },
       body: JSON.stringify({
@@ -1279,7 +1279,7 @@ app.post("/api/deepseek/chat/stream", requireAuth, async (req, res) => {
     const response = await fetch(DEEPSEEK_API_URL, {
       method: "POST",
       headers: {
-        "Content-Type": "application/json",
+        "Content-Type": "application/json; charset=utf-8",
         Authorization: `Bearer ${apiKey}`,
       },
       body: JSON.stringify({
@@ -1299,13 +1299,13 @@ app.post("/api/deepseek/chat/stream", requireAuth, async (req, res) => {
     }
 
     // Set headers for SSE
-    res.setHeader("Content-Type", "text/event-stream");
+    res.setHeader("Content-Type", "text/event-stream; charset=utf-8");
     res.setHeader("Cache-Control", "no-cache");
     res.setHeader("Connection", "keep-alive");
 
     // Pipe the stream
     const reader = response.body.getReader();
-    const decoder = new TextDecoder();
+    const decoder = new TextDecoder("utf-8");
 
     const pump = async () => {
       try {
@@ -1368,7 +1368,7 @@ app.post("/api/deepseek/translate", requireAuth, async (req, res) => {
     const response = await fetch(DEEPSEEK_API_URL, {
       method: "POST",
       headers: {
-        "Content-Type": "application/json",
+        "Content-Type": "application/json; charset=utf-8",
         Authorization: `Bearer ${apiKey}`,
       },
       body: JSON.stringify({
diff --git a/src/services/deepseek.ts b/src/services/deepseek.ts
index b973906..c3da97d 100644
--- a/src/services/deepseek.ts
+++ b/src/services/deepseek.ts
@@ -42,7 +42,7 @@ export async function sendMessage(
   const response = await fetch(`${API_BASE}/api/deepseek/chat`, {
     method: "POST",
     headers: {
-      "Content-Type": "application/json",
+      "Content-Type": "application/json; charset=utf-8",
     },
     credentials: "include",
     body: JSON.stringify({
@@ -82,7 +82,7 @@ export async function sendMessageStream(
   const response = await fetch(`${API_BASE}/api/deepseek/chat/stream`, {
     method: "POST",
     headers: {
-      "Content-Type": "application/json",
+      "Content-Type": "application/json; charset=utf-8",
     },
     credentials: "include",
     body: JSON.stringify({
@@ -110,7 +110,7 @@ export async function sendMessageStream(
   const reader = response.body?.getReader();
   if (!reader) throw new Error("No response body");
 
-  const decoder = new TextDecoder();
+  const decoder = new TextDecoder("utf-8");
   let fullContent = "";
   let buffer = ""; // Buffer for incomplete lines
 
@@ -120,7 +120,7 @@ export async function sendMessageStream(
 
     // Append new data to buffer
     buffer += decoder.decode(value, { stream: true });
-    
+
     // Process complete lines only
     const lines = buffer.split("\n");
     // Keep last incomplete line in buffer
@@ -129,7 +129,7 @@ export async function sendMessageStream(
     for (const line of lines) {
       const trimmed = line.trim();
       if (!trimmed || !trimmed.startsWith("data: ")) continue;
-      
+
       const data = trimmed.slice(6);
       if (data === "[DONE]") continue;