Auth stuff

package-lock.json

@@ -1,87 +0,0 @@
-{
-  "name": "friends",
-  "lockfileVersion": 3,
-  "requires": true,
-  "packages": {
-    "": {
-      "dependencies": {
-        "@types/cookie-parser": "^1.4.3"
-      }
-    },
-    "node_modules/@types/body-parser": {
-      "version": "1.19.2",
-      "resolved": "https://registry.npmjs.org/@types/body-parser/-/body-parser-1.19.2.tgz",
-      "integrity": "sha512-ALYone6pm6QmwZoAgeyNksccT9Q4AWZQ6PvfwR37GT6r6FWUPguq6sUmNGSMV2Wr761oQoBxwGGa6DR5o1DC9g==",
-      "dependencies": {
-        "@types/connect": "*",
-        "@types/node": "*"
-      }
-    },
-    "node_modules/@types/connect": {
-      "version": "3.4.35",
-      "resolved": "https://registry.npmjs.org/@types/connect/-/connect-3.4.35.tgz",
-      "integrity": "sha512-cdeYyv4KWoEgpBISTxWvqYsVy444DOqehiF3fM3ne10AmJ62RSyNkUnxMJXHQWRQQX2eR94m5y1IZyDwBjV9FQ==",
-      "dependencies": {
-        "@types/node": "*"
-      }
-    },
-    "node_modules/@types/cookie-parser": {
-      "version": "1.4.3",
-      "resolved": "https://registry.npmjs.org/@types/cookie-parser/-/cookie-parser-1.4.3.tgz",
-      "integrity": "sha512-CqSKwFwefj4PzZ5n/iwad/bow2hTCh0FlNAeWLtQM3JA/NX/iYagIpWG2cf1bQKQ2c9gU2log5VUCrn7LDOs0w==",
-      "dependencies": {
-        "@types/express": "*"
-      }
-    },
-    "node_modules/@types/express": {
-      "version": "4.17.17",
-      "resolved": "https://registry.npmjs.org/@types/express/-/express-4.17.17.tgz",
-      "integrity": "sha512-Q4FmmuLGBG58btUnfS1c1r/NQdlp3DMfGDGig8WhfpA2YRUtEkxAjkZb0yvplJGYdF1fsQ81iMDcH24sSCNC/Q==",
-      "dependencies": {
-        "@types/body-parser": "*",
-        "@types/express-serve-static-core": "^4.17.33",
-        "@types/qs": "*",
-        "@types/serve-static": "*"
-      }
-    },
-    "node_modules/@types/express-serve-static-core": {
-      "version": "4.17.33",
-      "resolved": "https://registry.npmjs.org/@types/express-serve-static-core/-/express-serve-static-core-4.17.33.tgz",
-      "integrity": "sha512-TPBqmR/HRYI3eC2E5hmiivIzv+bidAfXofM+sbonAGvyDhySGw9/PQZFt2BLOrjUUR++4eJVpx6KnLQK1Fk9tA==",
-      "dependencies": {
-        "@types/node": "*",
-        "@types/qs": "*",
-        "@types/range-parser": "*"
-      }
-    },
-    "node_modules/@types/mime": {
-      "version": "3.0.1",
-      "resolved": "https://registry.npmjs.org/@types/mime/-/mime-3.0.1.tgz",
-      "integrity": "sha512-Y4XFY5VJAuw0FgAqPNd6NNoV44jbq9Bz2L7Rh/J6jLTiHBSBJa9fxqQIvkIld4GsoDOcCbvzOUAbLPsSKKg+uA=="
-    },
-    "node_modules/@types/node": {
-      "version": "18.15.11",
-      "resolved": "https://registry.npmjs.org/@types/node/-/node-18.15.11.tgz",
-      "integrity": "sha512-E5Kwq2n4SbMzQOn6wnmBjuK9ouqlURrcZDVfbo9ftDDTFt3nk7ZKK4GMOzoYgnpQJKcxwQw+lGaBvvlMo0qN/Q=="
-    },
-    "node_modules/@types/qs": {
-      "version": "6.9.7",
-      "resolved": "https://registry.npmjs.org/@types/qs/-/qs-6.9.7.tgz",
-      "integrity": "sha512-FGa1F62FT09qcrueBA6qYTrJPVDzah9a+493+o2PCXsesWHIn27G98TsSMs3WPNbZIEj4+VJf6saSFpvD+3Zsw=="
-    },
-    "node_modules/@types/range-parser": {
-      "version": "1.2.4",
-      "resolved": "https://registry.npmjs.org/@types/range-parser/-/range-parser-1.2.4.tgz",
-      "integrity": "sha512-EEhsLsD6UsDM1yFhAvy0Cjr6VwmpMWqFBCb9w07wVugF7w9nfajxLuVmngTIpgS6svCnm6Vaw+MZhoDCKnOfsw=="
-    },
-    "node_modules/@types/serve-static": {
-      "version": "1.15.1",
-      "resolved": "https://registry.npmjs.org/@types/serve-static/-/serve-static-1.15.1.tgz",
-      "integrity": "sha512-NUo5XNiAdULrJENtJXZZ3fHtfMolzZwczzBbnAeBbqBwG+LaG6YaJtuwzwGSQZ2wsCrxjEhNNjAkKigy3n8teQ==",
-      "dependencies": {
-        "@types/mime": "*",
-        "@types/node": "*"
-      }
-    }
-  }
-}

package.json

@@ -1,5 +0,0 @@
-{
-  "dependencies": {
-    "@types/cookie-parser": "^1.4.3"
-  }
-}

server/package-lock.json

@@ -13,10 +13,10 @@
         "@nestjs/core": "^9.0.0",
         "@nestjs/platform-express": "^9.0.0",
         "@prisma/client": "^4.12.0",
-        "@types/cookie-parser": "^1.4.3",
         "class-transformer": "^0.5.1",
         "class-validator": "^0.14.0",
         "cookie-parser": "^1.4.6",
+        "openpgp": "^5.7.0",
         "reflect-metadata": "^0.1.13",
         "rxjs": "^7.2.0"
       },
@@ -24,9 +24,11 @@
         "@nestjs/cli": "^9.0.0",
         "@nestjs/schematics": "^9.0.0",
         "@nestjs/testing": "^9.0.0",
+        "@types/cookie-parser": "^1.4.3",
         "@types/express": "^4.17.13",
         "@types/jest": "29.5.0",
         "@types/node": "18.15.11",
+        "@types/openpgp": "^4.4.18",
         "@types/supertest": "^2.0.11",
         "@typescript-eslint/eslint-plugin": "^5.0.0",
         "@typescript-eslint/parser": "^5.0.0",
@@ -1804,10 +1806,20 @@
         "@babel/types": "^7.3.0"
       }
     },
+    "node_modules/@types/bn.js": {
+      "version": "5.1.1",
+      "resolved": "https://registry.npmjs.org/@types/bn.js/-/bn.js-5.1.1.tgz",
+      "integrity": "sha512-qNrYbZqMx0uJAfKnKclPh+dTwK33KfLHYqtyODwd5HnXOjnkhc4qgn3BrK6RWyGZm5+sIFE7Q7Vz6QQtJB7w7g==",
+      "dev": true,
+      "dependencies": {
+        "@types/node": "*"
+      }
+    },
     "node_modules/@types/body-parser": {
       "version": "1.19.2",
       "resolved": "https://registry.npmjs.org/@types/body-parser/-/body-parser-1.19.2.tgz",
       "integrity": "sha512-ALYone6pm6QmwZoAgeyNksccT9Q4AWZQ6PvfwR37GT6r6FWUPguq6sUmNGSMV2Wr761oQoBxwGGa6DR5o1DC9g==",
+      "dev": true,
       "dependencies": {
         "@types/connect": "*",
         "@types/node": "*"
@@ -1817,6 +1829,7 @@
       "version": "3.4.35",
       "resolved": "https://registry.npmjs.org/@types/connect/-/connect-3.4.35.tgz",
       "integrity": "sha512-cdeYyv4KWoEgpBISTxWvqYsVy444DOqehiF3fM3ne10AmJ62RSyNkUnxMJXHQWRQQX2eR94m5y1IZyDwBjV9FQ==",
+      "dev": true,
       "dependencies": {
         "@types/node": "*"
       }
@@ -1825,6 +1838,7 @@
       "version": "1.4.3",
       "resolved": "https://registry.npmjs.org/@types/cookie-parser/-/cookie-parser-1.4.3.tgz",
       "integrity": "sha512-CqSKwFwefj4PzZ5n/iwad/bow2hTCh0FlNAeWLtQM3JA/NX/iYagIpWG2cf1bQKQ2c9gU2log5VUCrn7LDOs0w==",
+      "dev": true,
       "dependencies": {
         "@types/express": "*"
       }
@@ -1865,6 +1879,7 @@
       "version": "4.17.17",
       "resolved": "https://registry.npmjs.org/@types/express/-/express-4.17.17.tgz",
       "integrity": "sha512-Q4FmmuLGBG58btUnfS1c1r/NQdlp3DMfGDGig8WhfpA2YRUtEkxAjkZb0yvplJGYdF1fsQ81iMDcH24sSCNC/Q==",
+      "dev": true,
       "dependencies": {
         "@types/body-parser": "*",
         "@types/express-serve-static-core": "^4.17.33",
@@ -1876,6 +1891,7 @@
       "version": "4.17.33",
       "resolved": "https://registry.npmjs.org/@types/express-serve-static-core/-/express-serve-static-core-4.17.33.tgz",
       "integrity": "sha512-TPBqmR/HRYI3eC2E5hmiivIzv+bidAfXofM+sbonAGvyDhySGw9/PQZFt2BLOrjUUR++4eJVpx6KnLQK1Fk9tA==",
+      "dev": true,
       "dependencies": {
         "@types/node": "*",
         "@types/qs": "*",
@@ -1934,12 +1950,23 @@
     "node_modules/@types/mime": {
       "version": "3.0.1",
       "resolved": "https://registry.npmjs.org/@types/mime/-/mime-3.0.1.tgz",
-      "integrity": "sha512-Y4XFY5VJAuw0FgAqPNd6NNoV44jbq9Bz2L7Rh/J6jLTiHBSBJa9fxqQIvkIld4GsoDOcCbvzOUAbLPsSKKg+uA=="
+      "integrity": "sha512-Y4XFY5VJAuw0FgAqPNd6NNoV44jbq9Bz2L7Rh/J6jLTiHBSBJa9fxqQIvkIld4GsoDOcCbvzOUAbLPsSKKg+uA==",
+      "dev": true
     },
     "node_modules/@types/node": {
       "version": "18.15.11",
       "resolved": "https://registry.npmjs.org/@types/node/-/node-18.15.11.tgz",
-      "integrity": "sha512-E5Kwq2n4SbMzQOn6wnmBjuK9ouqlURrcZDVfbo9ftDDTFt3nk7ZKK4GMOzoYgnpQJKcxwQw+lGaBvvlMo0qN/Q=="
+      "integrity": "sha512-E5Kwq2n4SbMzQOn6wnmBjuK9ouqlURrcZDVfbo9ftDDTFt3nk7ZKK4GMOzoYgnpQJKcxwQw+lGaBvvlMo0qN/Q==",
+      "dev": true
+    },
+    "node_modules/@types/openpgp": {
+      "version": "4.4.18",
+      "resolved": "https://registry.npmjs.org/@types/openpgp/-/openpgp-4.4.18.tgz",
+      "integrity": "sha512-8PGX6byEni97ZRRp2fVguSk4hbw4e+0vd8XHmyUt0+PjRoMcOZHsn+StQQjfo/wA/3kf/KCbV6I4pwmSC5/LKg==",
+      "dev": true,
+      "dependencies": {
+        "@types/bn.js": "*"
+      }
     },
     "node_modules/@types/parse-json": {
       "version": "4.0.0",
@@ -1956,12 +1983,14 @@
     "node_modules/@types/qs": {
       "version": "6.9.7",
       "resolved": "https://registry.npmjs.org/@types/qs/-/qs-6.9.7.tgz",
-      "integrity": "sha512-FGa1F62FT09qcrueBA6qYTrJPVDzah9a+493+o2PCXsesWHIn27G98TsSMs3WPNbZIEj4+VJf6saSFpvD+3Zsw=="
+      "integrity": "sha512-FGa1F62FT09qcrueBA6qYTrJPVDzah9a+493+o2PCXsesWHIn27G98TsSMs3WPNbZIEj4+VJf6saSFpvD+3Zsw==",
+      "dev": true
     },
     "node_modules/@types/range-parser": {
       "version": "1.2.4",
       "resolved": "https://registry.npmjs.org/@types/range-parser/-/range-parser-1.2.4.tgz",
-      "integrity": "sha512-EEhsLsD6UsDM1yFhAvy0Cjr6VwmpMWqFBCb9w07wVugF7w9nfajxLuVmngTIpgS6svCnm6Vaw+MZhoDCKnOfsw=="
+      "integrity": "sha512-EEhsLsD6UsDM1yFhAvy0Cjr6VwmpMWqFBCb9w07wVugF7w9nfajxLuVmngTIpgS6svCnm6Vaw+MZhoDCKnOfsw==",
+      "dev": true
     },
     "node_modules/@types/semver": {
       "version": "7.3.13",
@@ -1973,6 +2002,7 @@
       "version": "1.15.1",
       "resolved": "https://registry.npmjs.org/@types/serve-static/-/serve-static-1.15.1.tgz",
       "integrity": "sha512-NUo5XNiAdULrJENtJXZZ3fHtfMolzZwczzBbnAeBbqBwG+LaG6YaJtuwzwGSQZ2wsCrxjEhNNjAkKigy3n8teQ==",
+      "dev": true,
       "dependencies": {
         "@types/mime": "*",
         "@types/node": "*"
@@ -2562,6 +2592,17 @@
       "integrity": "sha512-BSHWgDSAiKs50o2Re8ppvp3seVHXSRM44cdSsT9FfNEUUZLOGWVCsiWaRPWM1Znn+mqZ1OfVZ3z3DWEzSp7hRA==",
       "dev": true
     },
+    "node_modules/asn1.js": {
+      "version": "5.4.1",
+      "resolved": "https://registry.npmjs.org/asn1.js/-/asn1.js-5.4.1.tgz",
+      "integrity": "sha512-+I//4cYPccV8LdmBLiX8CYvf9Sp3vQsrqu2QNXRcrbiWvcx/UdlFiqUJJzxRQxgsZmvhXhn4cSKeSmoFjVdupA==",
+      "dependencies": {
+        "bn.js": "^4.0.0",
+        "inherits": "^2.0.1",
+        "minimalistic-assert": "^1.0.0",
+        "safer-buffer": "^2.1.0"
+      }
+    },
     "node_modules/asynckit": {
       "version": "0.4.0",
       "resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",
@@ -2719,6 +2760,11 @@
         "node": ">= 6"
       }
     },
+    "node_modules/bn.js": {
+      "version": "4.12.0",
+      "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-4.12.0.tgz",
+      "integrity": "sha512-c98Bf3tPniI+scsdk237ku1Dc3ujXQTSgyiPUDEOe7tRkhrqridvh8klBv0HCEso1OLOYcHuCv/cS6DNxKH+ZA=="
+    },
     "node_modules/body-parser": {
       "version": "1.20.2",
       "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-1.20.2.tgz",
@@ -5788,6 +5834,11 @@
         "node": ">=6"
       }
     },
+    "node_modules/minimalistic-assert": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/minimalistic-assert/-/minimalistic-assert-1.0.1.tgz",
+      "integrity": "sha512-UtJcAD4yEaGtjPezWuO9wC4nwUnVH/8/Im3yEHQP4b67cXlD/Qr9hdITCU1xDbSEXg2XKNaP8jsReV7vQd00/A=="
+    },
     "node_modules/minimatch": {
       "version": "3.1.2",
       "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-3.1.2.tgz",
@@ -6001,6 +6052,17 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/openpgp": {
+      "version": "5.7.0",
+      "resolved": "https://registry.npmjs.org/openpgp/-/openpgp-5.7.0.tgz",
+      "integrity": "sha512-wchYJQfFbSaocUvUIYqNrWD+lRSmFSG1d3Ak2CHeXFocDSEsf7Uc1zUzHjSdlZPTvGeeXPQ+MJrwVtalL4QCBg==",
+      "dependencies": {
+        "asn1.js": "^5.0.0"
+      },
+      "engines": {
+        "node": ">= 8.0.0"
+      }
+    },
     "node_modules/optionator": {
       "version": "0.9.1",
       "resolved": "https://registry.npmjs.org/optionator/-/optionator-0.9.1.tgz",

server/package.json

@@ -24,10 +24,10 @@
     "@nestjs/core": "^9.0.0",
     "@nestjs/platform-express": "^9.0.0",
     "@prisma/client": "^4.12.0",
-    "@types/cookie-parser": "^1.4.3",
     "class-transformer": "^0.5.1",
     "class-validator": "^0.14.0",
     "cookie-parser": "^1.4.6",
+    "openpgp": "^5.7.0",
     "reflect-metadata": "^0.1.13",
     "rxjs": "^7.2.0"
   },
@@ -35,9 +35,11 @@
     "@nestjs/cli": "^9.0.0",
     "@nestjs/schematics": "^9.0.0",
     "@nestjs/testing": "^9.0.0",
+    "@types/cookie-parser": "^1.4.3",
     "@types/express": "^4.17.13",
     "@types/jest": "29.5.0",
     "@types/node": "18.15.11",
+    "@types/openpgp": "^4.4.18",
     "@types/supertest": "^2.0.11",
     "@typescript-eslint/eslint-plugin": "^5.0.0",
     "@typescript-eslint/parser": "^5.0.0",

server/src/app.controller.ts

@@ -1,12 +0,0 @@
-import { Controller, Get } from '@nestjs/common';
-import { AppService } from './app.service';
-
-@Controller()
-export class AppController {
-  constructor(private readonly appService: AppService) {}
-
-  @Get()
-  getHello(): string {
-    return this.appService.getHello();
-  }
-}

server/src/app.module.ts

@@ -1,11 +1,9 @@
 import { Module } from '@nestjs/common';
-import { AppController } from './app.controller';
-import { AppService } from './app.service';
 import { PrismaModule } from './prisma/prisma.module';
+import { TimerModule } from './timer/timer.module';
+import { AuthModule } from './auth/auth.module';
 
 @Module({
-  imports: [PrismaModule],
+  imports: [PrismaModule, TimerModule, AuthModule],
-  controllers: [AppController],
-  providers: [AppService],
 })
 export class AppModule {}

server/src/app.service.ts

@@ -1,8 +0,0 @@
-import { Injectable } from '@nestjs/common';
-
-@Injectable()
-export class AppService {
-  getHello(): string {
-    return 'Hello World!';
-  }
-}

server/src/auth/auth.controller.ts

@@ -0,0 +1,88 @@
+import {
+  Controller,
+  Get,
+  Post,
+  Body,
+  Param,
+  NotFoundException,
+  BadRequestException,
+  Res,
+  UseGuards,
+  Req,
+} from '@nestjs/common';
+import { IsNotEmpty } from 'class-validator';
+import { readKey, readCleartextMessage, verify } from 'openpgp';
+import { AuthService } from './auth.service';
+import { AuthGuard } from './auth.guard';
+
+export class LoginUserDTO {
+  @IsNotEmpty()
+  signature: string;
+}
+
+@Controller('/auth')
+export class AuthController {
+  constructor(private readonly authService: AuthService) {}
+
+  @UseGuards(AuthGuard)
+  @Get('/logout')
+  async logout(@Res({ passthrough: true }) res, @Req() req) {
+    res.cookie('god_token', '', {
+      maxAge: -1,
+      path: '/',
+    });
+    return await this.authService.deleteToken(req.token);
+  }
+
+  @Get('/:name')
+  async retrieveGodToken(@Param('name') name: string) {
+    const friend = await this.authService.findFriendByName(name);
+    if (!friend) throw new NotFoundException('Friend not found with that name');
+
+    return await this.authService.createTokenForFriend(friend);
+  }
+
+  @Post()
+  async verifyFriend(
+    @Res({ passthrough: true }) res,
+    @Body() { signature }: LoginUserDTO,
+  ) {
+    let signatureObj;
+    try {
+      signatureObj = await readCleartextMessage({
+        cleartextMessage: signature,
+      });
+    } catch (e) {
+      throw new BadRequestException('Invalid PGP Signature');
+    }
+    const { text: token } = signatureObj;
+
+    const referencedToken = await this.authService.findGodTokenWithFriend(
+      token,
+    );
+    if (!referencedToken)
+      throw new NotFoundException('Could not find God Token to sign');
+
+    const { friend } = referencedToken;
+    const publicKeyObj = await readKey({ armoredKey: friend.public_key });
+    const verificationResult = await verify({
+      message: signatureObj,
+      verificationKeys: publicKeyObj,
+    });
+
+    const { verified } = verificationResult.signatures[0];
+    if (await verified) {
+      res.cookie('god_token', token, {
+        httpOnly: true,
+        path: '/',
+        expires: referencedToken.expiration,
+      });
+
+      return await this.authService.signToken(token);
+    }
+
+    throw new BadRequestException(
+      "PGP signature could not be verified with user's public key",
+    );
+  }
+}

server/src/auth/auth.guard.ts

@@ -0,0 +1,32 @@
+import {
+  Injectable,
+  CanActivate,
+  ExecutionContext,
+  UnauthorizedException,
+} from '@nestjs/common';
+import { AuthService } from './auth.service';
+
+@Injectable()
+export class AuthGuard implements CanActivate {
+  constructor(private authService: AuthService) {}
+
+  async canActivate(context: ExecutionContext): Promise<boolean> {
+    const req = context.switchToHttp().getRequest();
+
+    if (!req.cookies.god_token) throw new UnauthorizedException('No session');
+
+    const token = await this.authService.findGodTokenWithFriend(
+      req.cookies.god_token,
+    );
+
+    if (!token) throw new UnauthorizedException('Could not verify session');
+    if (new Date().getTime() > token.expiration.getTime())
+      throw new UnauthorizedException('Session has expired');
+
+    const { friend } = token;
+    req.friend = friend;
+    req.token = token.token;
+
+    return true;
+  }
+}

server/src/auth/auth.module.ts

@@ -0,0 +1,13 @@
+import { Module } from '@nestjs/common';
+import { PrismaModule } from '../prisma/prisma.module';
+import { AuthController } from './auth.controller';
+import { AuthGuard } from './auth.guard';
+import { AuthService } from './auth.service';
+
+@Module({
+  imports: [PrismaModule],
+  controllers: [AuthController],
+  exports: [AuthGuard],
+  providers: [AuthService, AuthGuard],
+})
+export class AuthModule {}

server/src/auth/auth.service.ts

@@ -0,0 +1,60 @@
+import { Injectable } from '@nestjs/common';
+import { Friend } from '@prisma/client';
+import { randomInt } from 'crypto';
+
+import { PrismaService } from '../prisma/prisma.service';
+import words from './words';
+
+export const GOD_TOKEN_EXPIRATION_MS = 420 * 69 * 1000;
+export const GOD_TOKEN_LENGTH = 25;
+
+@Injectable()
+export class AuthService {
+  constructor(private readonly prismaService: PrismaService) {}
+
+  private makeGodToken = (godTokenLength = GOD_TOKEN_LENGTH) =>
+    Array(godTokenLength)
+      .fill(null)
+      .map(() => words[randomInt(0, words.length)])
+      .join(' ');
+
+  public findFriendByName(name: string) {
+    return this.prismaService.friend.findUnique({
+      where: { name },
+    });
+  }
+
+  public createTokenForFriend(friend: Friend) {
+    return this.prismaService.godToken.create({
+      data: {
+        token: this.makeGodToken(),
+        friend_id: friend.id,
+        expiration: new Date(new Date().getTime() + GOD_TOKEN_EXPIRATION_MS),
+      },
+    });
+  }
+
+  public deleteToken(token: string) {
+    return this.prismaService.godToken.delete({
+      where: { token },
+    });
+  }
+
+  public signToken(token: string) {
+    return this.prismaService.godToken.update({
+      where: { token },
+      data: {
+        signed: true,
+      },
+    });
+  }
+
+  public findGodTokenWithFriend(token: string) {
+    return this.prismaService.godToken.findUnique({
+      where: { token },
+      include: {
+        friend: true,
+      },
+    });
+  }
+}

server/src/timer/timer.module.ts

@@ -0,0 +1,4 @@
+import { Module } from '@nestjs/common';
+
+@Module({})
+export class TimerModule {}