first commit

apps/gateway/src/sync/userService.ts

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+import { SyncRepository } from "./repository";
+import { createSyncToken } from "./crypto";
+import { config } from "../config";
+
+interface Code2SessionResult {
+  openid: string;
+  unionid?: string;
+}
+
+async function fetchCode2Session(code: string): Promise<Code2SessionResult> {
+  const url = new URL("https://api.weixin.qq.com/sns/jscode2session");
+  url.searchParams.set("appid", config.sync.miniprogramAppId);
+  url.searchParams.set("secret", config.sync.miniprogramAppSecret);
+  url.searchParams.set("js_code", code);
+  url.searchParams.set("grant_type", "authorization_code");
+  const response = await fetch(url, { signal: AbortSignal.timeout(10000) });
+  if (!response.ok) {
+    throw new Error(`wechat code2Session failed: ${response.status}`);
+  }
+  const payload = (await response.json()) as {
+    openid?: string;
+    unionid?: string;
+    errcode?: number;
+    errmsg?: string;
+  };
+  if (!payload.openid) {
+    throw new Error(payload.errmsg || `wechat code2Session failed: ${payload.errcode || "unknown"}`);
+  }
+  return {
+    openid: payload.openid,
+    unionid: payload.unionid
+  };
+}
+
+export async function loginMiniprogramUser(code: string, repository = new SyncRepository()) {
+  const result = await fetchCode2Session(code);
+  const user = repository.getOrCreateUser(result.openid, result.unionid || null);
+  const session = createSyncToken(user.id, user.openid);
+  return {
+    user,
+    ...session
+  };
+}