updating meme manager to update memes

src/meme_upload_handler.mjs

@@ -107,3 +107,117 @@ export const handleMemeUpload = async (req, res) => {
         return sendJson(res, { success: false, message: err.message }, 500);
     }
 };
+
+export const handleMemeEdit = async (req, res) => {
+    console.log('[BOOT] [MEME HANDLER] Edit Started');
+
+    // Manual Session Lookup
+    let user = [];
+    if (req.cookies && req.cookies.session) {
+        user = await db`
+            select "user".id, "user".login, "user".user, "user".admin, "user".is_moderator, "user_sessions".id as sess_id, "user_sessions".csrf_token
+            from "user_sessions"
+            left join "user" on "user".id = "user_sessions".user_id
+            where "user_sessions".session = ${lib.sha256(req.cookies.session)}
+            limit 1
+          `;
+    }
+
+    if (user.length === 0 || !user[0].admin) {
+        console.log('[MEME HANDLER] Unauthorized');
+        return sendJson(res, { success: false, message: 'Unauthorized' }, 403);
+    }
+
+    req.session = user[0];
+
+    // CSRF validation
+    if (req.session.csrf_token) {
+        const csrfToken = req.headers['x-csrf-token'];
+        if (!csrfToken || csrfToken !== req.session.csrf_token) {
+            console.warn(`[CSRF] Blocked meme edit for user ${req.session.user}. Invalid token.`);
+            return sendJson(res, { success: false, message: 'Invalid CSRF token' }, 403);
+        }
+    }
+
+    const id = req.params.id;
+
+    try {
+        // Fetch existing template first
+        const currentMeme = await db`SELECT * FROM meme_templates WHERE id = ${id}`;
+        if (currentMeme.length === 0) {
+            return sendJson(res, { success: false, message: 'Meme template not found' }, 404);
+        }
+
+        const contentType = req.headers['content-type'] || '';
+        const boundaryMatch = contentType.match(/boundary=([^;]+)/);
+
+        if (!boundaryMatch) {
+            return sendJson(res, { success: false, message: 'Invalid content type' }, 400);
+        }
+
+        let boundary = boundaryMatch[1].trim();
+        if (boundary.startsWith('"') && boundary.endsWith('"')) {
+            boundary = boundary.substring(1, boundary.length - 1);
+        }
+
+        const bodyBuffer = await collectBody(req);
+        const parts = parseMultipart(bodyBuffer, boundary);
+
+        const template_id = (parts.template_id || '').trim().toLowerCase();
+        const name = (parts.name || '').trim();
+        const category = (parts.category || '').trim() || 'General';
+        let url = (parts.url || '').trim();
+
+        if (!template_id || !name) {
+            return sendJson(res, { success: false, message: 'Template ID and Name are required' }, 400);
+        }
+
+        if (!/^[a-z0-9-]+$/.test(template_id)) {
+            return sendJson(res, { success: false, message: 'Invalid ID. Use lowercase a-z, 0-9, - only.' }, 400);
+        }
+
+        // Ensure template_id is unique
+        const existing = await db`SELECT id FROM meme_templates WHERE template_id = ${template_id} AND id != ${id}`;
+        if (existing.length > 0) {
+            return sendJson(res, { success: false, message: 'Template ID is already in use by another template' }, 400);
+        }
+
+        const file = parts.file;
+        if (file && file.data && file.data.length > 0) {
+            const extMatch = file.filename.match(/\.([a-z0-9]+)$/i);
+            const ext = extMatch ? extMatch[1].toLowerCase() : 'jpg';
+            const filename = `${template_id}_${Math.random().toString(36).substring(7)}.${ext}`;
+
+            const filePath = path.join(cfg.paths.memes, filename);
+            console.error(`[BOOT] [MEME HANDLER] Writing file to: ${filePath} (Size: ${file.data.length})`);
+            await fs.writeFile(filePath, file.data);
+            
+            const exists = (await fs.stat(filePath)).size > 0;
+            console.error(`[BOOT] [MEME HANDLER] Write verify: ${exists ? 'SUCCESS' : 'FAILURE'}`);
+            
+            if (exists) {
+                url = `/memes/${filename}`;
+            } else {
+                throw new Error("File was written but verify failed (size 0 or not found)");
+            }
+        }
+
+        // If no file uploaded and no URL input provided, keep the existing one
+        if (!url) {
+            url = currentMeme[0].url;
+        }
+
+        await db`
+            UPDATE meme_templates
+            SET template_id = ${template_id}, name = ${name}, category = ${category}, url = ${url}
+            WHERE id = ${id}
+        `;
+
+        return sendJson(res, { success: true });
+
+    } catch (err) {
+        console.error('[MEME HANDLER ERROR]', err);
+        return sendJson(res, { success: false, message: err.message }, 500);
+    }
+};
+