feat(auth): 前端接入 Discord 登录 + 设置页登录方式管理

app/[locale]/login/page.tsx

@@ -30,8 +30,9 @@ export default async function LoginPage({ params }: Props) {
           <h1 className="text-3xl font-bold">{t("heading")}</h1>
           <p className="text-muted-foreground">{t("subheading")}</p>
         </div>
-        <div className="flex justify-center">
-          <SignInButton />
+        <div className="flex flex-col items-center gap-3">
+          <SignInButton provider="github" label={t("github")} />
+          <SignInButton provider="discord" label={t("discord")} />
         </div>
       </div>
     </div>

app/[locale]/settings/LinkedAccounts.tsx

@@ -0,0 +1,117 @@
+"use client";
+
+import { useEffect, useState } from "react";
+import { useTranslations } from "next-intl";
+
+type LinkedIdentity = {
+  provider: string;
+  displayNameAtLink: string | null;
+  linkedAt: string | null;
+  lastLoginAt: string | null;
+};
+
+function getToken(): string | null {
+  if (typeof window === "undefined") return null;
+  return localStorage.getItem("satoken");
+}
+
+const PROVIDER_LABEL: Record<string, string> = {
+  github: "GitHub",
+  discord: "Discord",
+};
+
+/**
+ * 已绑定登录方式的查看 + 解绑（后端 M2a）。绑定新 provider 走 OAuth 流程，
+ * 待绑定流程（M2b）上线后再加"连接"按钮——现在加会把用户登成新账号（分叉）。
+ */
+export function LinkedAccounts() {
+  const t = useTranslations("settings.linked");
+  const [items, setItems] = useState<LinkedIdentity[] | null>(null);
+  const [error, setError] = useState<string | null>(null);
+  const [busy, setBusy] = useState<string | null>(null);
+
+  async function load() {
+    const token = getToken();
+    if (!token) return;
+    try {
+      const res = await fetch("/api/user-center/identities", {
+        headers: { satoken: token },
+      });
+      if (!res.ok) throw new Error();
+      const body = await res.json();
+      setItems(body.data ?? []);
+      setError(null);
+    } catch {
+      setError(t("loadFail"));
+    }
+  }
+
+  useEffect(() => {
+    load();
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, []);
+
+  async function unbind(provider: string) {
+    const token = getToken();
+    if (!token) return;
+    setBusy(provider);
+    try {
+      const res = await fetch(`/api/user-center/identities/${provider}`, {
+        method: "DELETE",
+        headers: { satoken: token },
+      });
+      const body = await res.json();
+      if (!res.ok || body.success === false) {
+        // 后端把"最后一种登录方式不能解绑"等作为 400 + message 返回
+        setError(body.message ?? t("unbindFail"));
+        return;
+      }
+      setItems(body.data ?? []);
+      setError(null);
+    } catch {
+      setError(t("unbindFail"));
+    } finally {
+      setBusy(null);
+    }
+  }
+
+  if (items === null && !error) return null; // 未登录或加载中，保持安静
+
+  return (
+    <section className="mt-10">
+      <label className="block font-serif font-bold text-lg mb-3">
+        {t("label")}
+      </label>
+      {error && (
+        <p className="font-mono text-xs text-[#CC0000] mb-3">{error}</p>
+      )}
+      <ul className="border border-[var(--foreground)] divide-y divide-[var(--foreground)]/20">
+        {(items ?? []).map((it) => (
+          <li
+            key={it.provider}
+            className="flex items-center justify-between px-4 py-3"
+          >
+            <span className="font-mono text-sm text-[var(--foreground)]">
+              {PROVIDER_LABEL[it.provider] ?? it.provider}
+              {it.displayNameAtLink ? ` · ${it.displayNameAtLink}` : ""}
+            </span>
+            <button
+              type="button"
+              onClick={() => unbind(it.provider)}
+              disabled={busy === it.provider || (items ?? []).length <= 1}
+              title={(items ?? []).length <= 1 ? t("lastHint") : undefined}
+              className="font-mono text-xs uppercase tracking-widest text-[var(--foreground)]/70 hover:text-[#CC0000] transition-colors disabled:opacity-40 disabled:cursor-not-allowed"
+            >
+              {busy === it.provider ? "…" : t("unbind")}
+            </button>
+          </li>
+        ))}
+        {(items ?? []).length === 0 && (
+          <li className="px-4 py-3 font-mono text-sm text-neutral-500">
+            {t("empty")}
+          </li>
+        )}
+      </ul>
+    </section>
+  );
+}

app/[locale]/settings/page.tsx

@@ -5,6 +5,7 @@ import type { Metadata } from "next";
 import { Header } from "@/app/components/Header";
 import { Footer } from "@/app/components/Footer";
 import { SettingsForm } from "./SettingsForm";
+import { LinkedAccounts } from "./LinkedAccounts";
 
 // SEO: 设置页仅登录用户相关，不参与搜索索引
 export const metadata: Metadata = {
@@ -29,6 +30,7 @@ export default function SettingsPage() {
             </p>
           </div>
           <SettingsForm />
+          <LinkedAccounts />
         </div>
       </main>
       <Footer />

app/components/SignInButton.tsx

@@ -4,16 +4,21 @@ import { Button } from "@/app/components/ui/button";
 
 interface SignInButtonProps {
   className?: string;
+  // 默认 github（header 处无 props 调用不变）；登录页可传 discord。
+  provider?: "github" | "discord";
+  label?: string;
 }
 
-export function SignInButton({ className }: SignInButtonProps) {
-  // 同源跳到 /oauth/render/github，经 next.config.mjs 的 rewrite 代理到后端。
-  // 好处：开发环境后端端口改来改去（8080 / 8081）都不用改前端；302 由 Next.js 透传给浏览器，
-  // 最终由浏览器跳到 GitHub 授权页。
-  // 注意：GitHub OAuth app 注册的 callback URL 决定最终返回的前端端口
-  // （当前注册为 localhost:3000/api/auth/callback/github），换端口跑本地时需在 GitHub OAuth app 里补一个。
+export function SignInButton({
+  className,
+  provider = "github",
+  label = "SignIn",
+}: SignInButtonProps) {
+  // 同源跳到 /oauth/render/{provider}，经 next.config.mjs 的 rewrite 代理到后端。
+  // 好处：开发环境后端端口改来改去都不用改前端；302 由 Next.js 透传给浏览器，
+  // 最终跳到 provider 授权页。各 provider 的 OAuth app 回调 URL 决定返回的前端地址。
   const handleSignIn = () => {
-    window.location.href = "/oauth/render/github";
+    window.location.href = `/oauth/render/${provider}`;
   };
 
   return (
@@ -25,8 +30,9 @@ export function SignInButton({ className }: SignInButtonProps) {
       data-umami-event="auth_click"
       data-umami-event-action="signin"
       data-umami-event-location="header"
+      data-umami-event-provider={provider}
     >
-      SignIn
+      {label}
     </Button>
   );
 }

messages/en.json

@@ -68,7 +68,9 @@
   },
   "login": {
     "heading": "Sign In",
-    "subheading": "Sign in to access protected pages"
+    "subheading": "Sign in to access protected pages",
+    "github": "Sign in with GitHub",
+    "discord": "Sign in with Discord"
   },
   "settings": {
     "theme": {
@@ -93,6 +95,14 @@
       "saveSuccess": "Preferences saved",
       "saveFail": "Save failed — try again later",
       "fetchFail": "Failed to fetch preferences"
+    },
+    "linked": {
+      "label": "Sign-in methods",
+      "unbind": "Unlink",
+      "empty": "No linked sign-in methods",
+      "loadFail": "Failed to load sign-in methods",
+      "unbindFail": "Unlink failed",
+      "lastHint": "This is your only sign-in method and can't be unlinked"
     }
   },
   "signIn": {

messages/zh.json

@@ -68,7 +68,9 @@
   },
   "login": {
     "heading": "登录",
-    "subheading": "请登录以访问受保护的页面"
+    "subheading": "请登录以访问受保护的页面",
+    "github": "用 GitHub 登录",
+    "discord": "用 Discord 登录"
   },
   "settings": {
     "theme": {
@@ -93,6 +95,14 @@
       "saveSuccess": "偏好设置已保存",
       "saveFail": "保存失败，请稍后重试",
       "fetchFail": "获取偏好失败"
+    },
+    "linked": {
+      "label": "登录方式",
+      "unbind": "解绑",
+      "empty": "暂无绑定的第三方登录",
+      "loadFail": "加载登录方式失败",
+      "unbindFail": "解绑失败",
+      "lastHint": "这是你唯一的登录方式，不能解绑"
     }
   },
   "signIn": {

next.config.mjs

@@ -357,10 +357,11 @@ const config = {
     const backendUrl = process.env.BACKEND_URL ?? "http://localhost:8080";
     return [
       {
-        // GitHub OAuth 回调：GitHub → localhost:3000/api/auth/callback/github → 后端
-        // 路径与 GitHub OAuth App 注册的 callback URL 保持一致，无需改 GitHub App 设置
-        source: "/api/auth/callback/github",
-        destination: `${backendUrl}/api/auth/callback/github`,
+        // OAuth 回调代理到后端。:provider 覆盖 github / discord / …，路径与各家
+        // OAuth App 注册的 callback URL 保持一致（后端按 {provider} 分发）。
+        // 之前硬编码只有 github，Discord 回调 /api/auth/callback/discord 会漏代理 → 404。
+        source: "/api/auth/callback/:provider",
+        destination: `${backendUrl}/api/auth/callback/:provider`,
       },
       {
         // 认证 API（/auth/me, /auth/logout 等）走 Next.js 代理，避免浏览器跨域 CORS 问题