feat(auth): 平台超管租户切换（super 标志 + switch-tenant）

- JWT 加 super 标志，sub 保持超管真实 userId，tenantCode 随切换
- isSuper 解析/checkUserActive/PermissionsGuard 支持跨租户超管
- POST /auth/switch-tenant

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/auth/auth.controller.ts

@@ -1,7 +1,7 @@
 import { Body, Controller, Get, Patch, Post, Req, UnauthorizedException } from '@nestjs/common';
 import type { Request } from 'express';
 import { AuthService } from './auth.service.js';
-import { ChangePasswordDto, LoginDto, RefreshDto, RegisterDto } from './dto.js';
+import { ChangePasswordDto, LoginDto, RefreshDto, RegisterDto, SwitchTenantDto } from './dto.js';
 import { Public } from './decorators.js';
 import { getRequestContext } from '../common/context/request-context.js';
 
@@ -38,7 +38,7 @@ export class AuthController {
   menus() {
     const ctx = getRequestContext();
     if (!ctx) throw new UnauthorizedException('未登录');
-    return this.auth.getMenus(ctx.tenantCode, ctx.userId);
+    return this.auth.getMenus(ctx.tenantCode, ctx.userId, ctx.super);
   }
 
   /** 当前用户权限码（含超管标志），供前端按钮/路由级权限控制（仅需登录）。 */
@@ -46,7 +46,15 @@ export class AuthController {
   permissions() {
     const ctx = getRequestContext();
     if (!ctx) throw new UnauthorizedException('未登录');
-    return this.auth.getPermissionSet(ctx.tenantCode, ctx.userId);
+    return this.auth.getPermissionSet(ctx.tenantCode, ctx.userId, ctx.super);
+  }
+
+  /** 平台超管切换租户（仅需登录；内部校验调用者为平台超管）。 */
+  @Post('switch-tenant')
+  switchTenant(@Body() dto: SwitchTenantDto, @Req() req: Request) {
+    const ctx = getRequestContext();
+    if (!ctx) throw new UnauthorizedException('未登录');
+    return this.auth.switchTenant(ctx.userId, dto, req.ip, req.headers['user-agent']);
   }
 
   /** 当前租户品牌（仅需登录）。 */

src/auth/auth.service.ts

@@ -1,10 +1,10 @@
-import { BadRequestException, ConflictException, HttpStatus, Injectable, UnauthorizedException } from '@nestjs/common';
+import { BadRequestException, ConflictException, ForbiddenException, HttpStatus, Injectable, UnauthorizedException } from '@nestjs/common';
 import { JwtService } from '@nestjs/jwt';
 import bcrypt from 'bcryptjs';
 import { createHash, randomUUID } from 'node:crypto';
 import { PrismaService } from '../prisma/prisma.service.js';
 import { RedisService } from '../common/redis/redis.service.js';
-import { LoginDto, RefreshDto, RegisterDto, ChangePasswordDto } from './dto.js';
+import { ChangePasswordDto, LoginDto, RefreshDto, RegisterDto, SwitchTenantDto } from './dto.js';
 import { resolveDataScope, resolveVisibleOrgs } from '../common/data-scope.js';
 import type { DataScope } from '../common/enums.js';
 import type { RequestContext } from '../common/context/request-context.js';
@@ -303,15 +303,17 @@ export class AuthService {
   }
 
   /** 读取用户权限集；缓存缺失时重新聚合并回填（Redis 重启自愈）。 */
-  async getPermissionSet(tenantCode: string, userId: string): Promise<PermissionSet> {
+  async getPermissionSet(tenantCode: string, userId: string, switched = false): Promise<PermissionSet> {
     const cached = await this.redis.getJson<PermissionSet>(this.permKey(tenantCode, userId));
     if (cached) return cached;
-    return this.writePermissionCache(tenantCode, userId);
+    return this.writePermissionCache(tenantCode, userId, switched);
   }
 
   /** 当前用户的菜单树（超管返回全部启用菜单，否则按角色可见菜单 + 补祖先）。 */
-  async getMenus(tenantCode: string, userId: string): Promise<MenuNode[]> {
+  async getMenus(tenantCode: string, userId: string, switched = false): Promise<MenuNode[]> {
-    const roleRows = await this.prisma.client.userRole.findMany({
+    const roleRows = switched
+      ? []
+      : await this.prisma.client.userRole.findMany({
           where: { tenantCode, userId },
           select: { roleCode: true },
         });
@@ -324,7 +326,7 @@ export class AuthService {
         })
       : [];
     const activeRoleCodes = activeRoles.map((r) => r.code);
-    const isSuper = activeRoleCodes.includes(SUPER_ROLE);
+    const isSuper = switched || activeRoleCodes.includes(SUPER_ROLE);
 
     const rows = isSuper
       ? await this.prisma.client.resource.findMany({
@@ -368,19 +370,23 @@ export class AuthService {
   }
 
   /** 由 RequestContextInterceptor 调用，构建当前请求的租户/用户/数据权限上下文。 */
-  async buildContext(user: { userId: string; tenantCode: string; username: string }): Promise<RequestContext> {
+  async buildContext(user: { userId: string; tenantCode: string; username: string; super?: boolean }): Promise<RequestContext> {
+    const switched = user.super ?? false;
+    let orgCode: string | null = null;
+    let roleCodes: string[] = [];
+    if (!switched) {
       const u = await this.prisma.client.user.findFirst({
         where: { tenantCode: user.tenantCode, id: user.userId, deletedAt: null },
         select: { orgCode: true },
       });
-    const orgCode = u?.orgCode ?? null;
+      orgCode = u?.orgCode ?? null;
-
       const roleRows = await this.prisma.client.userRole.findMany({
         where: { tenantCode: user.tenantCode, userId: user.userId },
         select: { roleCode: true },
       });
-    const roleCodes = roleRows.map((r) => r.roleCode);
+      roleCodes = roleRows.map((r) => r.roleCode);
-    const isSuper = roleCodes.includes(SUPER_ROLE);
+    }
+    const isSuper = switched || roleCodes.includes(SUPER_ROLE);
     const roles = roleCodes.length
       ? await this.prisma.client.role.findMany({
           where: { tenantCode: user.tenantCode, code: { in: roleCodes }, deletedAt: null },
@@ -398,7 +404,15 @@ export class AuthService {
           roleCodes,
         });
 
-    return { tenantCode: user.tenantCode, userId: user.userId, username: user.username, dataScope, orgCode, orgCodes };
+    return {
+      tenantCode: user.tenantCode,
+      userId: user.userId,
+      username: user.username,
+      super: isSuper,
+      dataScope,
+      orgCode,
+      orgCodes,
+    };
   }
 
   private permKey(tenantCode: string, userId: string): string {
@@ -410,8 +424,10 @@ export class AuthService {
     tenantCode: string,
     userId: string,
     tokenVersion: number,
+    switched = false,
   ): Promise<{ active: boolean; mustChangePassword: boolean }> {
-    const key = userStateCacheKey(tenantCode, userId);
+    const homeTenant = switched ? PLATFORM_TENANT_CODE : tenantCode;
+    const key = userStateCacheKey(homeTenant, userId);
     let state = await this.redis.getJson<{
       status: string;
       tokenVersion: number;
@@ -420,7 +436,7 @@ export class AuthService {
     }>(key);
     if (!state) {
       const user = await this.prisma.client.user.findFirst({
-        where: { tenantCode, id: userId, deletedAt: null },
+        where: { tenantCode: homeTenant, id: userId, deletedAt: null },
         select: { status: true, tokenVersion: true, lockedAt: true, mustChangePassword: true },
       });
       if (!user) return { active: false, mustChangePassword: false };
@@ -460,9 +476,61 @@ export class AuthService {
     };
   }
 
+  /** 平台超管是否持有 super_admin 角色（查平台租户，不随切换租户变化）。 */
+  private async isPlatformSuperAdmin(userId: string): Promise<boolean> {
+    const row = await this.prisma.raw.userRole.findFirst({
+      where: { tenantCode: PLATFORM_TENANT_CODE, userId, roleCode: SUPER_ROLE },
+      select: { userId: true },
+    });
+    return row != null;
+  }
+
+  /** 平台超管切入任意租户：签发 super=true 的新 token（sub 保持超管真实 userId）。 */
+  async switchTenant(
+    userId: string,
+    dto: SwitchTenantDto,
+    ip?: string,
+    userAgent?: string,
+  ): Promise<{ accessToken: string; refreshToken: string; expiresIn: number; tenantCode: string; tenantName: string }> {
+    if (!(await this.isPlatformSuperAdmin(userId))) {
+      throw new ForbiddenException('仅平台超级管理员可切换租户');
+    }
+    const admin = await this.prisma.raw.user.findFirst({
+      where: { tenantCode: PLATFORM_TENANT_CODE, id: userId, deletedAt: null },
+    });
+    if (!admin || admin.status !== 'enabled' || admin.lockedAt) {
+      throw new BusinessException(ErrorCodes.AUTH_DISABLED, '平台超管账号不可用', HttpStatus.UNAUTHORIZED);
+    }
+    const tenant = await this.prisma.raw.tenant.findUnique({ where: { code: dto.tenantCode } });
+    if (!tenant || tenant.status !== 'enabled') {
+      throw new BusinessException(ErrorCodes.TENANT_NOT_FOUND, '目标租户不存在或已停用', HttpStatus.NOT_FOUND);
+    }
+    const tokens = await this.issue(
+      dto.tenantCode,
+      userId,
+      admin.username,
+      admin.tokenVersion,
+      { sid: randomUUID(), loginAt: new Date(), ip: ip ?? null, userAgent: userAgent ?? null },
+      true,
+    );
+    await this.recordAudit({
+      tenantCode: dto.tenantCode,
+      userId,
+      username: admin.username,
+      module: 'auth',
+      action: 'switch-tenant',
+      status: 'success',
+      ip: ip ?? null,
+      userAgent: userAgent ?? null,
+    });
+    return { ...tokens, tenantCode: dto.tenantCode, tenantName: tenant.name };
+  }
+
   /** 聚合权限码与超管标志。 */
-  private async resolveAuth(tenantCode: string, userId: string): Promise<PermissionSet> {
+  private async resolveAuth(tenantCode: string, userId: string, switched = false): Promise<PermissionSet> {
-    const roleRows = await this.prisma.client.userRole.findMany({
+    const roleRows = switched
+      ? []
+      : await this.prisma.client.userRole.findMany({
           where: { tenantCode, userId },
           select: { roleCode: true },
         });
@@ -475,7 +543,7 @@ export class AuthService {
         })
       : [];
     const activeRoleCodes = activeRoles.map((r) => r.code);
-    const isSuper = activeRoleCodes.includes(SUPER_ROLE);
+    const isSuper = switched || activeRoleCodes.includes(SUPER_ROLE);
     const resourceRows = activeRoleCodes.length
       ? await this.prisma.client.roleResource.findMany({
           where: { tenantCode, roleCode: { in: activeRoleCodes } },
@@ -495,8 +563,8 @@ export class AuthService {
   }
 
   /** 聚合并写入权限缓存（登录/刷新时调用）。 */
-  private async writePermissionCache(tenantCode: string, userId: string): Promise<PermissionSet> {
+  private async writePermissionCache(tenantCode: string, userId: string, switched = false): Promise<PermissionSet> {
-    const set = await this.resolveAuth(tenantCode, userId);
+    const set = await this.resolveAuth(tenantCode, userId, switched);
     await this.redis.setJson(this.permKey(tenantCode, userId), set, REFRESH_TTL);
     return set;
   }
@@ -538,8 +606,16 @@ export class AuthService {
     username: string,
     tokenVersion: number,
     session: { sid: string; loginAt: Date; ip?: string | null; userAgent?: string | null },
+    switched = false,
   ): Promise<{ accessToken: string; refreshToken: string; expiresIn: number }> {
-    const accessToken = this.jwt.sign({ sub: userId, tenantCode, username, ver: tokenVersion, sid: session.sid });
+    const accessToken = this.jwt.sign({
+      sub: userId,
+      tenantCode,
+      username,
+      ver: tokenVersion,
+      sid: session.sid,
+      ...(switched ? { super: true } : {}),
+    });
     const jti = randomUUID();
     await this.prisma.client.refreshToken.create({
       data: {

src/auth/dto.ts

@@ -65,3 +65,10 @@ export class RefreshDto {
   @IsNotEmpty()
   refreshToken!: string;
 }
+
+export class SwitchTenantDto {
+  @ApiProperty({ description: '目标租户编码' })
+  @IsString()
+  @IsNotEmpty()
+  tenantCode!: string;
+}

src/auth/jwt-auth.guard.ts

@@ -10,6 +10,7 @@ export interface AuthUser {
   userId: string;
   tenantCode: string;
   username: string;
+  super?: boolean;
 }
 
 @Injectable()
@@ -34,8 +35,8 @@ export class JwtAuthGuard implements CanActivate {
     const token = this.extractToken(request);
     if (!token) throw new UnauthorizedException('未登录');
     try {
-      const payload = await this.jwt.verifyAsync<{ sub: string; tenantCode: string; username: string; ver?: number; sid?: string }>(token);
+      const payload = await this.jwt.verifyAsync<{ sub: string; tenantCode: string; username: string; ver?: number; sid?: string; super?: boolean }>(token);
-      const { active, mustChangePassword } = await this.auth.checkUserActive(payload.tenantCode, payload.sub, payload.ver ?? 0);
+      const { active, mustChangePassword } = await this.auth.checkUserActive(payload.tenantCode, payload.sub, payload.ver ?? 0, payload.super ?? false);
       if (!active) throw new UnauthorizedException('账号已停用或登录已失效');
       if (payload.sid && (await this.auth.isSessionRevoked(payload.sid))) {
         throw new BusinessException(ErrorCodes.AUTH_SESSION_REVOKED, '会话已失效，请重新登录', HttpStatus.UNAUTHORIZED);
@@ -43,7 +44,12 @@ export class JwtAuthGuard implements CanActivate {
       if (mustChangePassword && !this.isAllowedWhileMustChange(request)) {
         throw new BusinessException(ErrorCodes.AUTH_MUST_CHANGE_PWD, '请先修改初始密码', HttpStatus.FORBIDDEN);
       }
-      request.user = { userId: payload.sub, tenantCode: payload.tenantCode, username: payload.username } satisfies AuthUser;
+      request.user = {
+        userId: payload.sub,
+        tenantCode: payload.tenantCode,
+        username: payload.username,
+        super: payload.super ?? false,
+      } satisfies AuthUser;
       return true;
     } catch (e) {
       if (e instanceof HttpException) throw e;

src/auth/permissions.guard.ts

@@ -18,10 +18,10 @@ export class PermissionsGuard implements CanActivate {
     if (!required || required.length === 0) return true;
 
     const request = context.switchToHttp().getRequest();
-    const user = request.user as { userId: string; tenantCode: string } | undefined;
+    const user = request.user as { userId: string; tenantCode: string; super?: boolean } | undefined;
     if (!user) throw new ForbiddenException('无权限');
 
-    const { super: isSuper, permissions } = await this.auth.getPermissionSet(user.tenantCode, user.userId);
+    const { super: isSuper, permissions } = await this.auth.getPermissionSet(user.tenantCode, user.userId, user.super ?? false);
     if (isSuper) return true;
     if (required.every((code) => permissions.includes(code))) return true;
     throw new ForbiddenException('无权限');

src/auth/request-context.interceptor.ts

@@ -13,7 +13,7 @@ export class RequestContextInterceptor implements NestInterceptor {
 
   intercept(context: ExecutionContext, next: CallHandler): Observable<unknown> {
     const request = context.switchToHttp().getRequest();
-    const user = request.user as { userId: string; tenantCode: string; username: string } | undefined;
+    const user = request.user as { userId: string; tenantCode: string; username: string; super?: boolean } | undefined;
     if (!user) return next.handle();
 
     return from(this.auth.buildContext(user)).pipe(

src/common/context/request-context.ts

@@ -6,6 +6,8 @@ export interface RequestContext {
   tenantCode: string;
   userId: string;
   username: string;
+  /** 是否平台超管（含跨租户切换后的超管）。 */
+  super: boolean;
   dataScope: DataScope;
   orgCode: string | null;
   /** 数据权限可见的部门 code 集合；空数组表示「全部可见」 */