add functions to login the radar scope

src/auth/auth.service.ts

@@ -113,6 +113,15 @@ export class AuthService {
       });
   }
 
+  async loginRadarScope(vatsimId: string, key: string): Promise<string> {
+    return this.userModel.findOne({ vatsimId }).then((user) => {
+      if (!user || user.radarScopeKey !== key) return undefined;
+
+      const payload = { vatsimId: vatsimId, sub: key };
+      return this.jwtService.sign(payload);
+    });
+  }
+
   async resetRadarScopeKey(token: string): Promise<void> {
     const payload = this.jwtService.verify(token, {
       secret: this.config.get<string>('server.jwt-secret'),