UsersService: Add toUserDto() converter

This conversion function makes sure that a photo URL exists.

Signed-off-by: David Mehren <git@herrmehren.de>

src/users/users.service.ts

@@ -1,5 +1,6 @@
 import { Injectable, Logger } from '@nestjs/common';
 import { UserInfoDto } from './user-info.dto';
+import { User } from './user.entity';
 
 @Injectable()
 export class UsersService {
@@ -15,4 +16,26 @@ export class UsersService {
       photo: '',
     };
   }
+
+  getPhotoUrl(user: User) {
+    if (user.photo) {
+      return user.photo;
+    } else {
+      // TODO: Create new photo, see old code
+      return '';
+    }
+  }
+
+  toUserDto(user: User): UserInfoDto {
+    if (user === undefined) {
+      this.logger.warn('toUserDto recieved undefined argument!');
+      return null;
+    }
+    return {
+      userName: user.userName,
+      displayName: user.displayName,
+      photo: this.getPhotoUrl(user),
+      email: user.email,
+    };
+  }
 }