Add shared HMAC+domain auth for remote SMS wallet API.

Products can authenticate with one shared secret and tenant domain instead of per-version tokens; Bearer token remains as fallback.

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

src/auth/remote-sms-auth.guard.ts

@@ -0,0 +1,200 @@
+import {
+  CanActivate,
+  ExecutionContext,
+  Injectable,
+  UnauthorizedException,
+} from '@nestjs/common';
+import { ConfigService } from '@nestjs/config';
+import { createHmac, timingSafeEqual } from 'crypto';
+import { PrismaService } from '../prisma/prisma.service';
+
+const MAX_SKEW_SECONDS = 300;
+
+/**
+ * Auth for product → SuperAdmin SMS:
+ * 1) Preferred: shared HMAC + domain headers
+ *    X-Abshode-Domain, X-Abshode-Timestamp, X-Abshode-Signature
+ *    payload = `${timestamp}.${METHOD}.${canonicalPath}.${domain}`
+ * 2) Fallback: Authorization Bearer {Tenant.remoteApiToken}
+ */
+@Injectable()
+export class RemoteSmsAuthGuard implements CanActivate {
+  constructor(
+    private readonly prisma: PrismaService,
+    private readonly config: ConfigService,
+  ) {}
+
+  async canActivate(context: ExecutionContext): Promise<boolean> {
+    const req = context.switchToHttp().getRequest();
+    const shared = String(
+      this.config.get<string>('SMS_REMOTE_SHARED_SECRET') || '',
+    ).trim();
+
+    const domainHeader = String(
+      req.headers['x-abshode-domain'] || '',
+    ).trim();
+    const tsHeader = String(
+      req.headers['x-abshode-timestamp'] || '',
+    ).trim();
+    const sigHeader = String(
+      req.headers['x-abshode-signature'] || '',
+    ).trim();
+
+    if (shared && domainHeader && tsHeader && sigHeader) {
+      req.remoteTenant = await this.authByHmac(
+        req,
+        shared,
+        domainHeader,
+        tsHeader,
+        sigHeader,
+      );
+      return true;
+    }
+
+    const bearerTenant = await this.authByBearer(req);
+    if (bearerTenant) {
+      req.remoteTenant = bearerTenant;
+      return true;
+    }
+
+    throw new UnauthorizedException(
+      'احراز هویت ریموت نامعتبر است (HMAC دامنه یا Bearer توکن)',
+    );
+  }
+
+  private async authByHmac(
+    req: any,
+    sharedSecret: string,
+    domainRaw: string,
+    tsRaw: string,
+    sigRaw: string,
+  ) {
+    const timestamp = Number(tsRaw);
+    if (!Number.isFinite(timestamp)) {
+      throw new UnauthorizedException('timestamp نامعتبر است');
+    }
+    const now = Math.floor(Date.now() / 1000);
+    if (Math.abs(now - timestamp) > MAX_SKEW_SECONDS) {
+      throw new UnauthorizedException('timestamp منقضی است');
+    }
+
+    const domain = this.normalizeHost(domainRaw);
+    if (!domain) {
+      throw new UnauthorizedException('دامنه نامعتبر است');
+    }
+
+    const method = String(req.method || 'GET').toUpperCase();
+    const pathOnly = String(req.originalUrl || req.url || '')
+      .split('?')[0]
+      .replace(/\/+$/, '');
+    const canonicalPath = pathOnly.startsWith('/api/')
+      ? pathOnly
+      : pathOnly.startsWith('/remote/')
+        ? `/api${pathOnly}`
+        : pathOnly || '/api/remote/sms/status';
+
+    const payload = `${timestamp}.${method}.${canonicalPath}.${domain}`;
+    const expected = createHmac('sha256', sharedSecret)
+      .update(payload, 'utf8')
+      .digest('hex');
+
+    if (!this.equalHex(expected, sigRaw)) {
+      throw new UnauthorizedException('امضای درخواست نامعتبر است');
+    }
+
+    const tenant = await this.findTenantByDomain(domain);
+    if (!tenant) {
+      throw new UnauthorizedException('نسخه‌ای با این دامنه یافت نشد');
+    }
+    return tenant;
+  }
+
+  private async authByBearer(req: any) {
+    const header = String(req.headers?.authorization || '');
+    const match = /^Bearer\s+(.+)$/i.exec(header.trim());
+    const token = match?.[1]?.trim();
+    if (!token || token.length < 16) return null;
+
+    return this.prisma.tenant.findFirst({
+      where: { remoteApiToken: token, isActive: true },
+      select: {
+        id: true,
+        nameFa: true,
+        domain: true,
+        product: true,
+        isActive: true,
+      },
+    });
+  }
+
+  private async findTenantByDomain(host: string) {
+    const tenants = await this.prisma.tenant.findMany({
+      where: { isActive: true },
+      select: {
+        id: true,
+        nameFa: true,
+        domain: true,
+        domains: true,
+        product: true,
+        isActive: true,
+      },
+    });
+
+    const hit = tenants.find((row) => this.matchesHost(row, host));
+    if (!hit) return null;
+    return {
+      id: hit.id,
+      nameFa: hit.nameFa,
+      domain: hit.domain,
+      product: hit.product,
+      isActive: hit.isActive,
+    };
+  }
+
+  private matchesHost(
+    tenant: { domain: string | null; domains: unknown },
+    host: string,
+  ) {
+    const candidates = new Set<string>();
+    for (const value of [tenant.domain, ...this.readDomains(tenant.domains)]) {
+      const normalized = this.normalizeHost(value);
+      if (normalized) candidates.add(normalized);
+    }
+    return candidates.has(host);
+  }
+
+  private readDomains(raw: unknown): string[] {
+    if (!raw) return [];
+    if (Array.isArray(raw)) return raw.map(String);
+    if (typeof raw === 'string') {
+      try {
+        const parsed = JSON.parse(raw);
+        return Array.isArray(parsed) ? parsed.map(String) : [];
+      } catch {
+        return [];
+      }
+    }
+    return [];
+  }
+
+  private normalizeHost(value?: string | null) {
+    if (!value) return '';
+    return String(value)
+      .trim()
+      .toLowerCase()
+      .replace(/^https?:\/\//, '')
+      .split('/')[0]
+      .split(':')[0];
+  }
+
+  private equalHex(a: string, b: string) {
+    try {
+      const left = Buffer.from(String(a).toLowerCase(), 'utf8');
+      const right = Buffer.from(String(b).toLowerCase(), 'utf8');
+      if (left.length !== right.length) return false;
+      return timingSafeEqual(left, right);
+    } catch {
+      return false;
+    }
+  }
+}

src/sms/remote-sms.controller.ts

@@ -1,6 +1,6 @@
 import { Body, Controller, Get, Post, Query, UseGuards } from '@nestjs/common';
 import { RemoteTenant } from '../auth/remote-tenant.decorator';
-import { RemoteTokenGuard } from '../auth/remote-token.guard';
+import { RemoteSmsAuthGuard } from '../auth/remote-sms-auth.guard';
 import { RemoteSmsConsumeDto } from './dto/sms-account.dto';
 import { SmsService } from './sms.service';
 
@@ -13,14 +13,17 @@ type RemoteTenantInfo = {
 };
 
 /**
- * Product apps (Hamkar/Khanegi) → SuperAdmin SMS wallet.
- * Auth: Authorization: Bearer {Tenant.remoteApiToken}
+ * Product apps → SuperAdmin SMS wallet.
+ *
+ * Auth (preferred): shared HMAC
+ *   X-Abshode-Domain, X-Abshode-Timestamp, X-Abshode-Signature
+ * Fallback: Authorization Bearer {Tenant.remoteApiToken}
  *
  * GET  /api/remote/sms/status?parts=1
  * POST /api/remote/sms/consume
  */
 @Controller('remote/sms')
-@UseGuards(RemoteTokenGuard)
+@UseGuards(RemoteSmsAuthGuard)
 export class RemoteSmsController {
   constructor(private readonly smsService: SmsService) {}
 

src/sms/sms.module.ts

@@ -1,14 +1,14 @@
 import { Module } from '@nestjs/common';
 import { NotificationsModule } from '../notifications/notifications.module';
+import { RemoteSmsAuthGuard } from '../auth/remote-sms-auth.guard';
 import { RemoteSmsController } from './remote-sms.controller';
 import { SmsController } from './sms.controller';
 import { SmsService } from './sms.service';
-import { RemoteTokenGuard } from '../auth/remote-token.guard';
 
 @Module({
   imports: [NotificationsModule],
   controllers: [SmsController, RemoteSmsController],
-  providers: [SmsService, RemoteTokenGuard],
+  providers: [SmsService, RemoteSmsAuthGuard],
   exports: [SmsService],
 })
 export class SmsModule {}