auth: adds token-auth to public api

adds auth service
adds auth module
adds token-auth strategy
adds token-auth to all public api calls

Signed-off-by: Philip Molares <philip.molares@udo.edu>

src/auth/auth.service.ts

@@ -0,0 +1,16 @@
+import { Injectable } from '@nestjs/common';
+import { UsersService } from '../users/users.service';
+import { User } from '../users/user.entity';
+
+@Injectable()
+export class AuthService {
+  constructor(private usersService: UsersService) {}
+
+  async validateToken(token: string): Promise<User> {
+    const user = await this.usersService.getUserByAuthToken(token);
+    if (user) {
+      return user;
+    }
+    return null;
+  }
+}