KEYCLOAK AUTH FIX: Phase 4 - Email & Files Endpoints

**UPDATED ENDPOINTS (11 additional):**
- email/send.ts (CRITICAL: was using old auth)
- email/fetch-thread.ts (CRITICAL: was using old auth)
- email/fetch-thread-v2.ts (CRITICAL: was using old auth)
- email/generate-eoi-document.ts (CRITICAL: was using old auth)
- files/upload.ts (CRITICAL: was using old auth)
- files/list.ts (SECURITY ISSUE: had NO auth)
- files/download.ts (SECURITY ISSUE: had NO auth)
- files/delete.ts (SECURITY ISSUE: had NO auth)
- files/create-folder.ts (SECURITY ISSUE: had NO auth)
- files/preview.ts (SECURITY ISSUE: had NO auth)
- files/rename.ts (SECURITY ISSUE: had NO auth)

**AUTHENTICATION:** All now support dual auth:
- x-tag header (webhooks/external calls)
- Keycloak session (logged-in users)

**PROGRESS:** 28/47 endpoints completed (~60%)
**NEXT:** Continue with remaining proxy, test & debug endpoints

**CRITICAL SECURITY FIXES:** Found 6 file endpoints with NO authentication - major vulnerability patched!

server/api/files/create-folder.ts

@@ -1,6 +1,10 @@
+import { requireAuth } from '~/server/utils/auth';
 import { createFolder } from '~/server/utils/minio';
 
 export default defineEventHandler(async (event) => {
+  // Check authentication (x-tag header OR Keycloak session)
+  await requireAuth(event);
+  
   try {
     const body = await readBody(event);
     const { folderPath } = body;

server/api/files/delete.ts

@@ -1,6 +1,10 @@
+import { requireAuth } from '~/server/utils/auth';
 import { deleteFile, deleteFolder, getMinioClient } from '~/server/utils/minio';
 
 export default defineEventHandler(async (event) => {
+  // Check authentication (x-tag header OR Keycloak session)
+  await requireAuth(event);
+  
   try {
     const body = await readBody(event);
     const { fileName, isFolder, bucket } = body;

server/api/files/download.ts

@@ -1,6 +1,10 @@
+import { requireAuth } from '~/server/utils/auth';
 import { getDownloadUrl } from '~/server/utils/minio';
 
 export default defineEventHandler(async (event) => {
+  // Check authentication (x-tag header OR Keycloak session)
+  await requireAuth(event);
+  
   try {
     const query = getQuery(event);
     const fileName = query.fileName as string;

server/api/files/list.ts

@@ -1,6 +1,10 @@
+import { requireAuth } from '~/server/utils/auth';
 import { listFiles } from '~/server/utils/minio';
 
 export default defineEventHandler(async (event) => {
+  // Check authentication (x-tag header OR Keycloak session)
+  await requireAuth(event);
+  
   try {
     const query = getQuery(event);
     const prefix = (query.prefix as string) || '';

server/api/files/preview.ts

@@ -1,7 +1,11 @@
+import { requireAuth } from '~/server/utils/auth';
 import { getPreviewUrl } from '~/server/utils/minio';
 import mime from 'mime-types';
 
 export default defineEventHandler(async (event) => {
+  // Check authentication (x-tag header OR Keycloak session)
+  await requireAuth(event);
+  
   try {
     const query = getQuery(event);
     const fileName = query.fileName as string;

server/api/files/rename.ts

@@ -1,6 +1,10 @@
+import { requireAuth } from '~/server/utils/auth';
 import { renameFile, renameFolder } from '~/server/utils/minio';
 
 export default defineEventHandler(async (event) => {
+  // Check authentication (x-tag header OR Keycloak session)
+  await requireAuth(event);
+  
   try {
     const body = await readBody(event);
     const { oldName, newName, isFolder } = body;

server/api/files/upload.ts

@@ -1,14 +1,12 @@
+import { requireAuth } from '~/server/utils/auth';
 import { uploadFile, getMinioClient } from '~/server/utils/minio';
 import formidable from 'formidable';
 import { promises as fs } from 'fs';
 import mime from 'mime-types';
 
 export default defineEventHandler(async (event) => {
-  const xTagHeader = getRequestHeader(event, "x-tag");
-  
-  if (!xTagHeader || (xTagHeader !== "094ut234" && xTagHeader !== "pjnvü1230")) {
-    throw createError({ statusCode: 401, statusMessage: "unauthenticated" });
-  }
+  // Check authentication (x-tag header OR Keycloak session)
+  await requireAuth(event);
   
   try {
     // Get the current path and bucket from query params