Accounts can now be deleted

domain/src/main/kotlin/DomainModule.kt

@@ -6,18 +6,21 @@ import be.simplenotes.domain.security.PasswordHash
 import be.simplenotes.domain.security.SimpleJwt
 import be.simplenotes.domain.usecases.NoteService
 import be.simplenotes.domain.usecases.UserService
-import be.simplenotes.domain.usecases.login.LoginUseCase
-import be.simplenotes.domain.usecases.login.LoginUseCaseImpl
 import be.simplenotes.domain.usecases.markdown.MarkdownConverter
 import be.simplenotes.domain.usecases.markdown.MarkdownConverterImpl
-import be.simplenotes.domain.usecases.register.RegisterUseCase
-import be.simplenotes.domain.usecases.register.RegisterUseCaseImpl
+import be.simplenotes.domain.usecases.users.delete.DeleteUseCase
+import be.simplenotes.domain.usecases.users.delete.DeleteUseCaseImpl
+import be.simplenotes.domain.usecases.users.login.LoginUseCase
+import be.simplenotes.domain.usecases.users.login.LoginUseCaseImpl
+import be.simplenotes.domain.usecases.users.register.RegisterUseCase
+import be.simplenotes.domain.usecases.users.register.RegisterUseCaseImpl
 import org.koin.dsl.module
 
 val domainModule = module {
     single<LoginUseCase> { LoginUseCaseImpl(get(), get(), get()) }
     single<RegisterUseCase> { RegisterUseCaseImpl(get(), get()) }
-    single { UserService(get(), get()) }
+    single<DeleteUseCase> { DeleteUseCaseImpl(get(), get()) }
+    single { UserService(get(), get(), get()) }
     single<PasswordHash> { BcryptPasswordHash() }
     single { SimpleJwt(get()) }
     single { JwtPayloadExtractor(get()) }

domain/src/main/kotlin/usecases/UserService.kt

@@ -1,9 +1,11 @@
 package be.simplenotes.domain.usecases
 
-import be.simplenotes.domain.usecases.login.LoginUseCase
-import be.simplenotes.domain.usecases.register.RegisterUseCase
+import be.simplenotes.domain.usecases.users.delete.DeleteUseCase
+import be.simplenotes.domain.usecases.users.login.LoginUseCase
+import be.simplenotes.domain.usecases.users.register.RegisterUseCase
 
 class UserService(
     loginUseCase: LoginUseCase,
-    registerUseCase: RegisterUseCase
-) : LoginUseCase by loginUseCase, RegisterUseCase by registerUseCase
+    registerUseCase: RegisterUseCase,
+    deleteUseCase: DeleteUseCase,
+) : LoginUseCase by loginUseCase, RegisterUseCase by registerUseCase, DeleteUseCase by deleteUseCase

domain/src/main/kotlin/usecases/users/delete/DeleteUseCaseImpl.kt

@@ -0,0 +1,24 @@
+package be.simplenotes.domain.usecases.users.delete
+
+import arrow.core.Either
+import arrow.core.extensions.fx
+import arrow.core.rightIfNotNull
+import be.simplenotes.domain.security.PasswordHash
+import be.simplenotes.domain.usecases.repositories.UserRepository
+import be.simplenotes.domain.validation.UserValidations
+
+internal class DeleteUseCaseImpl(
+    private val userRepository: UserRepository,
+    private val passwordHash: PasswordHash,
+) : DeleteUseCase {
+    override fun delete(form: DeleteForm) = Either.fx<DeleteError, Unit> {
+        val user = !UserValidations.validateDelete(form)
+        val persistedUser = !userRepository.find(user.username).rightIfNotNull { DeleteError.Unregistered }
+        !Either.cond(
+            passwordHash.verify(user.password, persistedUser.password),
+            { Unit },
+            { DeleteError.WrongPassword }
+        )
+        !Either.cond(userRepository.delete(persistedUser.id), { Unit }, { DeleteError.Unregistered })
+    }
+}

domain/src/main/kotlin/usecases/users/delete/DeleteUsecase.kt

@@ -0,0 +1,16 @@
+package be.simplenotes.domain.usecases.users.delete
+
+import arrow.core.Either
+import io.konform.validation.ValidationErrors
+
+sealed class DeleteError {
+    object Unregistered : DeleteError()
+    object WrongPassword : DeleteError()
+    class InvalidForm(val validationErrors: ValidationErrors) : DeleteError()
+}
+
+data class DeleteForm(val username: String?, val password: String?, val checked: Boolean)
+
+interface DeleteUseCase {
+    fun delete(form: DeleteForm): Either<DeleteError, Unit>
+}

domain/src/main/kotlin/usecases/users/login/LoginUseCaseImpl.kt

@@ -1,4 +1,4 @@
-package be.simplenotes.domain.usecases.login
+package be.simplenotes.domain.usecases.users.login
 
 import arrow.core.Either
 import arrow.core.extensions.fx

domain/src/main/kotlin/usecases/users/login/LoginUsecase.kt

@@ -1,4 +1,4 @@
-package be.simplenotes.domain.usecases.login
+package be.simplenotes.domain.usecases.users.login
 
 import arrow.core.Either
 import io.konform.validation.ValidationErrors

domain/src/main/kotlin/usecases/users/register/RegisterUseCaseImpl.kt

@@ -1,4 +1,4 @@
-package be.simplenotes.domain.usecases.register
+package be.simplenotes.domain.usecases.users.register
 
 import arrow.core.Either
 import arrow.core.filterOrElse

domain/src/main/kotlin/usecases/users/register/RegisterUsecase.kt

@@ -1,8 +1,8 @@
-package be.simplenotes.domain.usecases.register
+package be.simplenotes.domain.usecases.users.register
 
 import arrow.core.Either
 import be.simplenotes.domain.model.PersistedUser
-import be.simplenotes.domain.usecases.login.LoginForm
+import be.simplenotes.domain.usecases.users.login.LoginForm
 import io.konform.validation.ValidationErrors
 
 sealed class RegisterError

domain/src/main/kotlin/validation/UserValidations.kt

@@ -4,10 +4,12 @@ import arrow.core.Either
 import arrow.core.left
 import arrow.core.right
 import be.simplenotes.domain.model.User
-import be.simplenotes.domain.usecases.login.InvalidLoginForm
-import be.simplenotes.domain.usecases.login.LoginForm
-import be.simplenotes.domain.usecases.register.InvalidRegisterForm
-import be.simplenotes.domain.usecases.register.RegisterForm
+import be.simplenotes.domain.usecases.users.delete.DeleteError
+import be.simplenotes.domain.usecases.users.delete.DeleteForm
+import be.simplenotes.domain.usecases.users.login.InvalidLoginForm
+import be.simplenotes.domain.usecases.users.login.LoginForm
+import be.simplenotes.domain.usecases.users.register.InvalidRegisterForm
+import be.simplenotes.domain.usecases.users.register.RegisterForm
 import io.konform.validation.Validation
 import io.konform.validation.jsonschema.maxLength
 import io.konform.validation.jsonschema.minLength
@@ -35,4 +37,24 @@ internal object UserValidations {
         return if (errors.isEmpty()) User(form.username!!, form.password!!).right()
         else return InvalidRegisterForm(errors).left()
     }
+
+    private val deleteValidator = Validation<DeleteForm> {
+        DeleteForm::username required {
+            minLength(3)
+            maxLength(50)
+        }
+        DeleteForm::password required {
+            minLength(8)
+            maxLength(72)
+        }
+        DeleteForm::checked required {
+            addConstraint("Should be checked") { it }
+        }
+    }
+
+    fun validateDelete(form: DeleteForm): Either<DeleteError.InvalidForm, User> {
+        val errors = deleteValidator.validate(form).errors
+        return if (errors.isEmpty()) User(form.username!!, form.password!!).right()
+        else return DeleteError.InvalidForm(errors).left()
+    }
 }