fix: improve toutiao image uploads

packages/publisher-platforms/src/toutiao.ts

@@ -138,7 +138,7 @@ async function uploadCover(
 
   if (publishType === 'publish') {
     const form = new FormData()
-    form.append('upfile', blob, 'cover.png')
+    form.append('upfile', blob, imageFileName(blob, 'cover'))
     const uploaded = await transport
       .fetchJson<ToutiaoUploadPictureResponse>(
         'https://mp.toutiao.com/mp/agw/article_material/photo/upload_picture',
@@ -164,7 +164,7 @@ async function uploadCover(
   }
 
   const firstForm = new FormData()
-  firstForm.append('image', blob, 'cover.png')
+  firstForm.append('image', blob, imageFileName(blob, 'cover'))
   const first = await transport
     .fetchJson<ToutiaoSpiceImageResponse>(
       'https://mp.toutiao.com/spice/image?device_platform=web',
@@ -220,7 +220,7 @@ async function uploadContentImage(
   }
 
   const form = new FormData()
-  form.append('image', blob, 'image.png')
+  form.append('image', blob, imageFileName(blob, 'image'))
   const uploaded = await transport
     .fetchJson<ToutiaoSpiceImageResponse>(
       'https://mp.toutiao.com/spice/image?device_platform=web',
@@ -234,6 +234,14 @@ async function uploadContentImage(
   return uploaded?.data?.image_url ?? null
 }
 
+function imageFileName(blob: Blob, baseName: string): string {
+  const type = blob.type.toLowerCase()
+  if (type === 'image/jpeg' || type === 'image/jpg') {
+    return `${baseName}.jpg`
+  }
+  return `${baseName}.png`
+}
+
 export async function publishToutiaoArticle(
   input: ToutiaoPublishArticleInput,
   transport: ToutiaoPublishTransport,