feat: validate and persist per-file quality in POST /api/jobs

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/app.js

@@ -13,6 +13,14 @@ import { deleteIfExists } from './storage.js';
 import { createJob, getJobByUuid } from './jobs/jobRepository.js';
 import { outputPath } from './storage.js';
 
+function isValidQuality(targetFormat, quality) {
+  if (quality === null || quality === undefined) return true;
+  if (!Number.isInteger(quality)) return false;
+  if (targetFormat === 'gif') return false;
+  if (targetFormat === 'png') return quality >= 0 && quality <= 9;
+  return quality >= 1 && quality <= 100;
+}
+
 let convertersRegistered = false;
 
 function registerAllConverters() {
@@ -73,6 +81,21 @@ export function createApp(config, pool) {
       return res.status(400).json({ error: 'targetFormats must have one entry per uploaded file' });
     }
 
+    let qualities;
+    try {
+      qualities = JSON.parse(req.body.qualities ?? '[]');
+    } catch {
+      return res.status(400).json({ error: 'qualities must be a JSON array' });
+    }
+
+    if (!Array.isArray(qualities)) {
+      return res.status(400).json({ error: 'qualities must be a JSON array' });
+    }
+
+    if (qualities.length > 0 && qualities.length !== req.files.length) {
+      return res.status(400).json({ error: 'qualities must have one entry per uploaded file, or be omitted' });
+    }
+
     const results = [];
     for (let i = 0; i < req.files.length; i += 1) {
       const file = req.files[i];
@@ -97,6 +120,16 @@ export function createApp(config, pool) {
         continue;
       }
 
+      const requestedQuality = qualities[i] ?? null;
+      if (!isValidQuality(targetFormat, requestedQuality)) {
+        await deleteIfExists(file.path);
+        results.push({
+          file: file.originalname,
+          error: `Invalid quality for target format ${targetFormat}`,
+        });
+        continue;
+      }
+
       const expiresAt = new Date(Date.now() + config.retentionHours * 3600 * 1000);
       await createJob(pool, {
         uuid,
@@ -108,6 +141,7 @@ export function createApp(config, pool) {
         inputMimeType: mime,
         inputSizeBytes: file.size,
         expiresAt,
+        quality: requestedQuality,
       });
 
       results.push({ file: file.originalname, id: uuid, status: 'pending' });