fix: poll grsai image tasks and return originals

lib/ai/providers/gemini-image.ts

@@ -664,6 +664,30 @@ async function sendGrsaiGptImageRequest(params: {
       responseKeys: isRecord(data) ? Object.keys(data).slice(0, 12) : [],
     });
 
+    if (!hasGrsaiImages(data)) {
+      const status = getGrsaiStatus(data);
+      if (status === "failed" || status === "error") {
+        throw new Error(`图片生成失败: ${getGrsaiErrorMessage(data)}`);
+      }
+
+      const taskId = getGrsaiTaskId(data);
+      if (taskId) {
+        logger.info(`${apiLogPrefix} Native response has no images, polling task result`, {
+          taskId,
+          progress: getGrsaiProgress(data),
+          status: status || null,
+        });
+        return pollGrsaiDrawResult({
+          baseURL,
+          apiKey,
+          taskId,
+          timeoutMs: timeout,
+          apiLogPrefix,
+          timeoutLabel: "Grsai GPT Image",
+        });
+      }
+    }
+
     return data;
   } catch (error) {
     clearTimeout(timeoutId);
@@ -827,6 +851,20 @@ async function pollGrsaiNanoBananaResult(params: {
   taskId: string;
   timeoutMs: number;
   apiLogPrefix: string;
+}): Promise<any> {
+  return pollGrsaiDrawResult({
+    ...params,
+    timeoutLabel: "GRSAI Nano Banana",
+  });
+}
+
+async function pollGrsaiDrawResult(params: {
+  baseURL: string;
+  apiKey: string;
+  taskId: string;
+  timeoutMs: number;
+  apiLogPrefix: string;
+  timeoutLabel: string;
 }): Promise<any> {
   const resultUrl = `${params.baseURL.replace(/\/+$/, "")}/v1/draw/result`;
   const deadline = Date.now() + params.timeoutMs;
@@ -882,7 +920,7 @@ async function pollGrsaiNanoBananaResult(params: {
     lastPayload: JSON.stringify(lastPayload || {}).substring(0, 500),
   });
   throw new Error(
-    `GRSAI Nano Banana 异步任务超时（${Math.round(params.timeoutMs / 1000)}秒），请稍后重试或切换备用模型`
+    `${params.timeoutLabel} 异步任务超时（${Math.round(params.timeoutMs / 1000)}秒），请稍后重试或切换备用模型`
   );
 }
 

lib/external-image-api/service.ts

@@ -51,6 +51,7 @@ export class ExternalImageApiGenerationError extends Error {
 
 type ExternalImageApiGeneratedImage = {
   id: number;
+  url: string;
   originalUrl: string;
   thumbnailUrl: string;
   imageSize: string;
@@ -484,6 +485,18 @@ function filterCompatibleCandidates(
   return acceptedCandidates;
 }
 
+function parseGeneratedImageMarkdownMeta(alt: string) {
+  const metaMatch = alt.match(/thumb\|\|\|([^|]+)\|\|\|(.+)$/i);
+  if (!metaMatch) {
+    return null;
+  }
+
+  return {
+    originalUrl: normalizeText(metaMatch[1]),
+    imageSize: normalizeText(metaMatch[2]),
+  };
+}
+
 export async function ensureHostedImageMarkdown(
   markdown: string,
   imageSize = "2K",
@@ -510,13 +523,21 @@ export async function ensureHostedImageMarkdown(
 
   for (const match of matches) {
     const raw = match[0];
-    const sourceUrl = match[2] || "";
+    const alt = match[1] || "";
+    const thumbnailSourceUrl = normalizeText(match[2]);
+    const metadata = parseGeneratedImageMarkdownMeta(alt);
+    const originalSourceUrl = metadata?.originalUrl || thumbnailSourceUrl;
+    const resolvedImageSize = metadata?.imageSize || imageSize;
     const start = match.index ?? -1;
     if (start < 0) continue;
 
     rebuilt += markdown.slice(cursor, start);
-    const hostedUrl = await ensureHostedImageUrl(sourceUrl);
-    rebuilt += `![thumb|||${hostedUrl}|||${imageSize}](${hostedUrl})`;
+    const hostedOriginalUrl = await ensureHostedImageUrl(originalSourceUrl);
+    const hostedThumbnailUrl =
+      thumbnailSourceUrl && thumbnailSourceUrl !== originalSourceUrl
+        ? await ensureHostedImageUrl(thumbnailSourceUrl)
+        : hostedOriginalUrl;
+    rebuilt += `![thumb|||${hostedOriginalUrl}|||${resolvedImageSize}](${hostedThumbnailUrl})`;
     cursor = start + raw.length;
   }
 
@@ -533,13 +554,14 @@ export function extractGeneratedImagesFromMarkdown(markdown: string) {
     const thumbnailUrl = match[2] || "";
     let originalUrl = thumbnailUrl;
     let imageSize = "2K";
-    const metaMatch = alt.match(/thumb\|\|\|([^|]+)\|\|\|(.+)$/i);
-    if (metaMatch) {
-      originalUrl = normalizeText(metaMatch[1]) || thumbnailUrl;
-      imageSize = normalizeText(metaMatch[2]) || imageSize;
+    const metadata = parseGeneratedImageMarkdownMeta(alt);
+    if (metadata) {
+      originalUrl = metadata.originalUrl || thumbnailUrl;
+      imageSize = metadata.imageSize || imageSize;
     }
     return {
       id: index + 1,
+      url: originalUrl,
       originalUrl,
       thumbnailUrl,
       imageSize,