feat(auth): implement Facebook user data fetching from Graph API and persist profile information
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/**
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* Facebook Graph API 工具
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*
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* 在 OAuth callback 之后、auth state machine 的 `syncingFacebookBackend` actor
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* 成功换取业务 token 之后调用 —— 用 accessToken 调 `/me` 拉用户资料(id / name
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* / email / picture),把 pictureUrl 写入 `UserStorage.setAvatarUrl()`、
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* id 写入 `AuthStorage.setFacebookId()`。
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*
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* 为什么不依赖后端返回的 avatarUrl?
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* - 后端可能未抓取 / 未存头像
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* - 头像有时效性(用户改 Facebook 头像),前端直接拉最新的
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* - Facebook ID 也独立存一份(与后端 userId 解耦,给 deep link 用)
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*
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* 不引入 Facebook SDK(window.FB)—— 减少前端 bundle 体积,Graph API
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* 单次 HTTP 调用即可拿到所有字段。SDK 加载慢、还要管 init。
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*
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* 端点:`https://graph.facebook.com/me?fields=id,name,email,picture.type=large&access_token=...`
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* - `picture.type=large` 返回 ~200px 头像 URL(默认 square 50px 太小)
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* - 不指定 version 走最新稳定版
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* - 不需要 appId / appSecret(accessToken 自身就是凭证)
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*/
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import { FacebookUserData } from "@/data/dto/auth/facebook_user_data";
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import { Logger } from "./logger";
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import { Result, toError } from "./result";
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const log = new Logger("FacebookGraph");
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/** Facebook Graph `/me` 端点。 */
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const GRAPH_ME_URL = "https://graph.facebook.com/me";
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/**
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* 拉取字段集合:
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* - id / name / email —— 给本地 FacebookUserData DTO
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* - picture.type=large —— 头像 URL(默认 square 50px 太小)
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*/
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const FIELDS = "id,name,email,picture.type=large";
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/**
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* 用 accessToken 调 Facebook Graph `/me` 拉用户资料。
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*
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* 错误处理:返回 `Result<FacebookUserData>` 而非 throw —— 调用方在
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* auth state machine actor 内可走「best-effort」路径,失败只 warn 不
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* 让 Facebook 登录整条流挂掉(后端业务 token 已经换到,头像只是锦上添花)。
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*/
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export async function fetchFacebookUserData(
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accessToken: string,
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): Promise<Result<FacebookUserData>> {
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if (!accessToken) {
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return Result.err(new Error("fetchFacebookUserData: accessToken is empty"));
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}
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const url = `${GRAPH_ME_URL}?fields=${encodeURIComponent(FIELDS)}&access_token=${encodeURIComponent(accessToken)}`;
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log.debug({ url: url.replace(accessToken, "<redacted>") }, "fetchFacebookUserData REQUEST");
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try {
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const res = await fetch(url, { method: "GET" });
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const json = (await res.json()) as Record<string, unknown>;
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if (!res.ok) {
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const errBody = (json?.error as Record<string, unknown> | undefined) ?? {};
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const message =
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typeof errBody.message === "string"
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? errBody.message
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: `Graph /me failed: HTTP ${res.status}`;
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log.warn({ status: res.status, body: errBody }, "fetchFacebookUserData FAILED");
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return Result.err(new Error(message));
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}
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// 提取 picture.data.url —— Graph API 返回嵌套结构
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const pictureUrl = extractPictureUrl(json.picture);
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const data = FacebookUserData.from({
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id: typeof json.id === "string" ? json.id : null,
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name: typeof json.name === "string" ? json.name : null,
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email: typeof json.email === "string" ? json.email : null,
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pictureUrl,
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});
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log.debug(
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{
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hasId: !!data.id,
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hasName: !!data.name,
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hasEmail: !!data.email,
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hasPicture: !!data.pictureUrl,
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},
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"fetchFacebookUserData SUCCESS",
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);
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return Result.ok(data);
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} catch (e) {
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const err = toError(e);
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log.error({ err }, "fetchFacebookUserData THREW");
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return Result.err(err);
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}
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}
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/**
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* 安全提取 `picture.data.url` —— 容错处理:
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* - 缺字段 / 类型不对 → null(头像可选)
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* - Graph API 偶尔返回 `picture: false`(没设头像)→ null
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*/
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function extractPictureUrl(raw: unknown): string | null {
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if (!raw || typeof raw !== "object") return null;
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const data = (raw as { data?: unknown }).data;
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if (!data || typeof data !== "object") return null;
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const url = (data as { url?: unknown }).url;
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return typeof url === "string" && url.length > 0 ? url : null;
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}
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