Use UserService

api/src/services/UserService.kt

@@ -1,11 +1,15 @@
 package be.vandewalleh.services
 
+import be.vandewalleh.entities.User
 import be.vandewalleh.tables.Users
 import me.liuwj.ktorm.database.Database
 import me.liuwj.ktorm.dsl.*
+import me.liuwj.ktorm.entity.add
+import me.liuwj.ktorm.entity.sequenceOf
 import org.kodein.di.Kodein
 import org.kodein.di.KodeinAware
 import org.kodein.di.generic.instance
+import java.time.LocalDateTime
 
 /**
  * service to handle database queries for users.
@@ -25,4 +29,43 @@ class UserService(override val kodein: Kodein) : KodeinAware {
             .firstOrNull()
     }
 
-}
+    /**
+     * returns a user email and password from it's email if found or null
+     */
+    fun getEmailAndPasswordFromUsername(username: String): Pair<String, String>? {
+        return db.from(Users)
+            .select(Users.email, Users.password)
+            .where { Users.username eq username }
+            .limit(0, 1)
+            .map { row -> row[Users.email]!! to row[Users.password]!! }
+            .firstOrNull()
+    }
+
+    fun userExists(username: String, email: String): Boolean {
+        return db.from(Users)
+            .select(Users.id)
+            .where { (Users.username eq username) or (Users.email eq email) }
+            .limit(0, 1)
+            .firstOrNull() != null
+    }
+
+    /**
+     * create a new user
+     * password should already be hashed
+     */
+    fun createUser(user: UserRegistrationDto) {
+        db.useTransaction {
+            val newUser = User {
+                this.username = user.username
+                this.email = user.email
+                this.password = user.password
+                this.createdAt = LocalDateTime.now()
+            }
+
+            db.sequenceOf(Users).add(newUser)
+        }
+    }
+
+}
+
+data class UserRegistrationDto(val username: String, val email: String, val password: String)