feat(worker-hall): 抢单大厅支持分类与全部按钮图标自定义及PNG透明通道修复

apps/backend/src/services/file-storage/file-storage-service.ts

@@ -225,12 +225,23 @@ export function refreshUploadedFileUrls(value: unknown) {
   }
 }
 
+export const PUBLIC_SCENES = new Set(['category_icon', 'hall_icon', 'public', 'announcement'])
+
+export function isPublicObjectKey(objectKey: string) {
+  const normalized = normalizeObjectKey(objectKey)
+  const firstSegment = normalized.split('/')[0] || ''
+  return PUBLIC_SCENES.has(firstSegment)
+}
+
 export function verifyFileAccessSignature(
   objectKey: string,
   expiresValue: unknown,
   signatureValue: unknown,
   nowSeconds = Math.floor(Date.now() / 1000),
 ) {
+  if (isPublicObjectKey(objectKey)) {
+    return
+  }
   const expires = Number(expiresValue || 0)
   const signature = String(signatureValue || '').trim()
   if (!Number.isSafeInteger(expires) || expires < nowSeconds || !signature) {
@@ -388,22 +399,24 @@ async function generateImageVariants(objectKey: string, data: Buffer, contentTyp
 
   for (const config of configs) {
     try {
-      const content = await sharp(data)
-        .rotate()
-        .resize({
-          width: config.maxSide,
-          height: config.maxSide,
-          fit: 'inside',
-          withoutEnlargement: true,
-        })
-        .flatten({ background: '#ffffff' })
-        .jpeg({ quality: config.quality, mozjpeg: true })
-        .toBuffer()
+      const isAlpha = contentType === 'image/png' || contentType === 'image/webp'
+      const pipeline = sharp(data).rotate().resize({
+        width: config.maxSide,
+        height: config.maxSide,
+        fit: 'inside',
+        withoutEnlargement: true,
+      })
+      const content = isAlpha
+        ? await pipeline.webp({ quality: config.quality, alphaQuality: 95 }).toBuffer()
+        : await pipeline
+            .flatten({ background: '#ffffff' })
+            .jpeg({ quality: config.quality, mozjpeg: true })
+            .toBuffer()
       variants.push({
         name: config.name,
         key: imageVariantKey(objectKey, config.name),
         content,
-        contentType: 'image/jpeg',
+        contentType: isAlpha ? 'image/webp' : 'image/jpeg',
       })
     } catch {
       return variants