fix: reduce upload failures on Cloudflare Workers

Optimize zip validation, lower max upload to 25MB, raise CPU limit, and show clear errors when Cloudflare returns HTML error pages.

Co-authored-by: Cursor <cursoragent@cursor.com>

.env.example

@@ -8,4 +8,4 @@ GITHUB_TOKEN=ghp_your_personal_access_token
 GITHUB_OWNER=shumengya
 GITHUB_REPO=Web2App
 DEFAULT_BRANCH=main
-MAX_UPLOAD_MB=50
+MAX_UPLOAD_MB=25

frontend/src/api/client.ts

@@ -1,3 +1,5 @@
+import { MAX_UPLOAD_BYTES, MAX_UPLOAD_MB } from "../lib/upload-limits";
+
 const API_BASE = import.meta.env.VITE_API_BASE ?? "";
 
 export type BuildStatus =
@@ -36,6 +38,12 @@ function apiUrl(path: string): string {
   return `${API_BASE}${path}`;
 }
 
+export function assertUploadSize(file: File): void {
+  if (file.size > MAX_UPLOAD_BYTES) {
+    throw new Error(`zip 不能超过 ${MAX_UPLOAD_MB}MB，请压缩后重试`);
+  }
+}
+
 export async function createBuild(formData: FormData): Promise<{ id: string }> {
   let response: Response;
   try {
@@ -49,7 +57,7 @@ export async function createBuild(formData: FormData): Promise<{ id: string }> {
     );
   }
 
-  const data = (await readJson(response)) as CreateBuildResponse;
+  const data = (await readResponseBody(response)) as CreateBuildResponse;
   if (!response.ok) {
     throw new Error(data.error ?? "上传失败");
   }
@@ -58,7 +66,7 @@ export async function createBuild(formData: FormData): Promise<{ id: string }> {
 
 export async function fetchBuild(id: string): Promise<Build> {
   const response = await fetch(apiUrl(`/api/builds/${id}`));
-  const data = (await readJson(response)) as Build;
+  const data = (await readResponseBody(response)) as Build;
   if (!response.ok) {
     const errorData = data as Build & ApiErrorResponse;
     throw new Error(errorData.error ?? "Failed to load build");
@@ -68,21 +76,56 @@ export async function fetchBuild(id: string): Promise<Build> {
 
 export async function fetchBuilds(): Promise<Build[]> {
   const response = await fetch(apiUrl("/api/builds"));
-  const data = (await readJson(response)) as { builds: Build[] };
+  const data = (await readResponseBody(response)) as { builds: Build[] };
   if (!response.ok) {
     throw new Error("Failed to load builds");
   }
   return data.builds;
 }
 
-async function readJson(response: Response): Promise<unknown> {
+function parseCloudflareHtmlError(status: number, text: string): string {
+  const codeMatch = text.match(/cloudflare[^0-9]*(\d{4})/i);
+  const cfCode = codeMatch?.[1];
+
+  if (status === 413) {
+    return `上传体积过大（HTTP 413），请压缩 zip 到 ${MAX_UPLOAD_MB}MB 以内`;
+  }
+  if (status === 502 || status === 503 || status === 524) {
+    return `服务器处理超时或暂时不可用（HTTP ${status}）。请缩小 zip 体积后重试，或稍后再试`;
+  }
+  if (cfCode === "1102" || text.includes("1102")) {
+    return "Worker CPU 时间超限（Cloudflare 1102）。请缩小 zip 或升级 Workers 付费套餐";
+  }
+  if (cfCode === "1101" || text.includes("1101")) {
+    return "Worker 运行时错误（Cloudflare 1101）。请检查 zip 是否损坏，或查看部署日志";
+  }
+
+  return `服务器返回了错误页面（HTTP ${status}），通常因 zip 过大或 Worker 超时。请压缩到 ${MAX_UPLOAD_MB}MB 以内后重试`;
+}
+
+async function readResponseBody(response: Response): Promise<unknown> {
   const text = await response.text();
   if (!text) return {};
 
+  const trimmed = text.trim();
+  if (trimmed.startsWith("{") || trimmed.startsWith("[")) {
     try {
-    return JSON.parse(text) as unknown;
+      return JSON.parse(trimmed) as unknown;
     } catch {
-    throw new Error(`Unexpected response from server: ${text.slice(0, 200)}`);
+      /* fall through */
+    }
+  }
+
+  if (trimmed.startsWith("<!DOCTYPE") || trimmed.startsWith("<html")) {
+    throw new Error(parseCloudflareHtmlError(response.status, text));
+  }
+
+  try {
+    return JSON.parse(trimmed) as unknown;
+  } catch {
+    throw new Error(
+      `服务器返回了无法解析的响应（HTTP ${response.status}）：${text.slice(0, 120)}`,
+    );
   }
 }
 

frontend/src/lib/upload-limits.ts

@@ -0,0 +1,7 @@
+/** 与 wrangler.toml MAX_UPLOAD_MB 保持一致 */
+export const MAX_UPLOAD_MB = 25;
+export const MAX_UPLOAD_BYTES = MAX_UPLOAD_MB * 1024 * 1024;
+
+export function formatMaxUploadLabel(): string {
+  return `${MAX_UPLOAD_MB}MB`;
+}

frontend/src/pages/Upload.tsx

@@ -1,7 +1,8 @@
 import { FormEvent, useEffect, useState } from "react";
 import { useNavigate } from "react-router-dom";
-import { createBuild } from "../api/client";
+import { assertUploadSize, createBuild } from "../api/client";
 import { getDefaultAppVersion } from "../lib/version";
+import { formatMaxUploadLabel } from "../lib/upload-limits";
 
 export default function Upload() {
   const navigate = useNavigate();
@@ -32,6 +33,13 @@ export default function Upload() {
       return;
     }
 
+    try {
+      assertUploadSize(file);
+    } catch (err) {
+      setError(err instanceof Error ? err.message : "文件过大");
+      return;
+    }
+
     setLoading(true);
     setError(null);
 
@@ -67,7 +75,8 @@ export default function Upload() {
       <section className="doc-section">
         <h2>使用说明</h2>
         <p className="prose">
-          压缩包需包含 index.html（根目录或单层文件夹内），默认不超过 50MB。
+          压缩包需包含 index.html（根目录或单层文件夹内），默认不超过{" "}
+          {formatMaxUploadLabel()}。
           可单独上传应用图标（PNG / JPG / ICO，优先于 zip 内图标），版本号默认取当天日期（如
           2026.5.29）。中文名用于展示，英文名用于安装包与 Bundle ID。
         </p>

frontend/tsconfig.app.tsbuildinfo

@@ -1 +1 @@
-{"root":["./src/app.tsx","./src/main.tsx","./src/vite-env.d.ts","./src/api/client.ts","./src/components/layout.tsx","./src/lib/version.ts","./src/pages/buildlist.tsx","./src/pages/jobstatus.tsx","./src/pages/upload.tsx"],"version":"5.6.3"}
+{"root":["./src/app.tsx","./src/main.tsx","./src/vite-env.d.ts","./src/api/client.ts","./src/components/layout.tsx","./src/lib/duration.ts","./src/lib/upload-limits.ts","./src/lib/version.ts","./src/pages/buildlist.tsx","./src/pages/jobstatus.tsx","./src/pages/upload.tsx"],"version":"5.6.3"}

worker/src/index.ts

@@ -7,6 +7,7 @@ import {
 
 export default {
   async fetch(request: Request, env: Env): Promise<Response> {
+    try {
       const url = new URL(request.url);
 
       if (request.method === "OPTIONS" && url.pathname.startsWith("/api/")) {
@@ -18,9 +19,22 @@ export default {
       }
 
       if (url.pathname.startsWith("/api/builds")) {
-      return handleBuildsRequest(request, env, url);
+        return await handleBuildsRequest(request, env, url);
       }
 
       return env.ASSETS.fetch(request);
+    } catch (error) {
+      console.error("Unhandled worker error:", error);
+      return jsonResponseWithCors(
+        request,
+        {
+          error:
+            error instanceof Error
+              ? error.message
+              : "Internal server error",
+        },
+        500,
+      );
+    }
   },
 };

worker/src/routes/builds.ts

@@ -9,18 +9,6 @@ import {
   type BuildRecord,
 } from "../db/builds";
 import { jsonResponseWithCors } from "../lib/response";
-
-function apiJson(
-  request: Request,
-  data: unknown,
-  status = 200,
-): Response {
-  return jsonResponseWithCors(request, data, status);
-}
-
-function apiError(request: Request, message: string, status: number): Response {
-  return jsonResponseWithCors(request, { error: message }, status);
-}
 import {
   getActionsRunUrl,
   getReleaseAssets,
@@ -43,6 +31,18 @@ import {
   ZipValidationError,
 } from "../services/zip";
 
+function apiJson(
+  request: Request,
+  data: unknown,
+  status = 200,
+): Response {
+  return jsonResponseWithCors(request, data, status);
+}
+
+function apiError(request: Request, message: string, status: number): Response {
+  return jsonResponseWithCors(request, { error: message }, status);
+}
+
 function maxUploadBytes(env: Env): number {
   const mb = Number(env.MAX_UPLOAD_MB ?? "50");
   return mb * 1024 * 1024;

worker/src/services/zip.ts

@@ -7,6 +7,99 @@ export class ZipValidationError extends Error {
   }
 }
 
+const CDH_SIG = 0x02014b50;
+
+/** 只读中央目录，不解压文件体，降低 Worker CPU 占用 */
+function listZipEntryNames(buffer: Uint8Array): string[] {
+  const eocdOffset = findEndOfCentralDirectory(buffer);
+  if (eocdOffset < 0) {
+    throw new ZipValidationError("Invalid zip archive");
+  }
+
+  const view = new DataView(
+    buffer.buffer,
+    buffer.byteOffset,
+    buffer.byteLength,
+  );
+  const cdSize = view.getUint32(eocdOffset + 12, true);
+  const cdOffset = view.getUint32(eocdOffset + 16, true);
+  const names: string[] = [];
+
+  let ptr = cdOffset;
+  const end = cdOffset + cdSize;
+  while (ptr + 46 <= end) {
+    if (view.getUint32(ptr, true) !== CDH_SIG) break;
+
+    const nameLen = view.getUint16(ptr + 28, true);
+    const extraLen = view.getUint16(ptr + 30, true);
+    const commentLen = view.getUint16(ptr + 32, true);
+    const nameStart = ptr + 46;
+
+    if (nameStart + nameLen > buffer.length) break;
+
+    const raw = new TextDecoder().decode(
+      buffer.subarray(nameStart, nameStart + nameLen),
+    );
+    const name = raw.replace(/\\/g, "/");
+    if (!name.endsWith("/")) {
+      names.push(name);
+    }
+
+    ptr = nameStart + nameLen + extraLen + commentLen;
+  }
+
+  if (names.length === 0) {
+    throw new ZipValidationError("Zip archive is empty");
+  }
+
+  return names;
+}
+
+function findEndOfCentralDirectory(buffer: Uint8Array): number {
+  const minEocd = 22;
+  const maxComment = 0xffff;
+  const start = Math.max(0, buffer.length - minEocd - maxComment);
+
+  for (let i = buffer.length - minEocd; i >= start; i--) {
+    if (
+      buffer[i] === 0x50 &&
+      buffer[i + 1] === 0x4b &&
+      buffer[i + 2] === 0x05 &&
+      buffer[i + 3] === 0x06
+    ) {
+      return i;
+    }
+  }
+
+  return -1;
+}
+
+function needsFlatten(entries: string[]): boolean {
+  if (entries.includes("index.html")) return false;
+
+  const indexEntry = entries.find((entry) => {
+    const parts = entry.split("/");
+    return parts.length === 2 && parts[1] === "index.html";
+  });
+
+  if (!indexEntry) {
+    throw new ZipValidationError(
+      "Zip must contain index.html at root or in a single top-level folder",
+    );
+  }
+
+  const folder = indexEntry.split("/")[0];
+  const topDirs = new Set(entries.map((k) => k.split("/")[0]).filter(Boolean));
+
+  if (topDirs.size !== 1 || !topDirs.has(folder)) {
+    throw new ZipValidationError(
+      "index.html must be at zip root or inside exactly one folder",
+    );
+  }
+
+  return true;
+}
+
 export function validateZipBuffer(
   buffer: Uint8Array,
   maxBytes: number,
@@ -17,6 +110,12 @@ export function validateZipBuffer(
     );
   }
 
+  const entries = listZipEntryNames(buffer);
+
+  if (!needsFlatten(entries)) {
+    return { normalizedBuffer: buffer };
+  }
+
   let files: Record<string, Uint8Array>;
   try {
     files = unzipSync(buffer);
@@ -24,26 +123,6 @@ export function validateZipBuffer(
     throw new ZipValidationError("Invalid zip archive");
   }
 
-  const entries = Object.keys(files).filter(
-    (key) => !key.endsWith("/") && files[key].length > 0,
-  );
-  if (entries.length === 0) {
-    throw new ZipValidationError("Zip archive is empty");
-  }
-
-  const indexEntry = entries.find((entry) => {
-    const normalized = entry.replace(/\\/g, "/");
-    if (normalized === "index.html") return true;
-    const parts = normalized.split("/");
-    return parts.length === 2 && parts[1] === "index.html";
-  });
-
-  if (!indexEntry) {
-    throw new ZipValidationError(
-      "Zip must contain index.html at root or in a single top-level folder",
-    );
-  }
-
   const normalized = normalizeZipFiles(files);
   return { normalizedBuffer: zipSync(normalized) };
 }

wrangler.toml

@@ -2,6 +2,10 @@ name = "web2app"
 main = "worker/src/index.ts"
 compatibility_date = "2024-11-01"
 
+# 付费 Workers 可提高 CPU 上限，避免大 zip 上传时触发 Cloudflare 1102
+[limits]
+cpu_ms = 300000
+
 [assets]
 directory = "./frontend/dist"
 not_found_handling = "single-page-application"
@@ -15,6 +19,6 @@ migrations_dir = "worker/migrations"
 
 [vars]
 DEFAULT_BRANCH = "main"
-MAX_UPLOAD_MB = "50"
+MAX_UPLOAD_MB = "25"
 GITHUB_OWNER = "shumengya"
 GITHUB_REPO = "Web2App"