feat: Notifications MVP

backend/api/src/main/kotlin/io/tolgee/api/v2/controllers/NotificationController.kt

@@ -0,0 +1,44 @@
+package io.tolgee.api.v2.controllers
+
+import io.swagger.v3.oas.annotations.Operation
+import io.swagger.v3.oas.annotations.tags.Tag
+import io.tolgee.hateoas.notification.NotificationEnhancer
+import io.tolgee.hateoas.notification.NotificationModel
+import io.tolgee.hateoas.notification.NotificationModelAssembler
+import io.tolgee.model.Notification
+import io.tolgee.security.authentication.AllowApiAccess
+import io.tolgee.security.authentication.AuthenticationFacade
+import io.tolgee.service.notification.NotificationService
+import org.springdoc.core.annotations.ParameterObject
+import org.springframework.data.domain.Pageable
+import org.springframework.data.web.PagedResourcesAssembler
+import org.springframework.hateoas.PagedModel
+import org.springframework.web.bind.annotation.CrossOrigin
+import org.springframework.web.bind.annotation.GetMapping
+import org.springframework.web.bind.annotation.RequestMapping
+import org.springframework.web.bind.annotation.RestController
+
+@RestController
+@CrossOrigin(origins = ["*"])
+@RequestMapping(
+  value = [
+    "/v2/notifications",
+  ],
+)
+@Tag(name = "Notifications", description = "Manipulates notifications")
+class NotificationController(
+  private val notificationService: NotificationService,
+  private val authenticationFacade: AuthenticationFacade,
+  private val enhancers: List<NotificationEnhancer>,
+  private val pagedResourcesAssembler: PagedResourcesAssembler<Notification>,
+) {
+  @GetMapping
+  @Operation(summary = "Gets notifications of the currently logged in user, newest is first.")
+  @AllowApiAccess
+  fun getNotifications(
+    @ParameterObject pageable: Pageable,
+  ): PagedModel<NotificationModel> {
+    val notifications = notificationService.getNotifications(authenticationFacade.authenticatedUser.id, pageable)
+    return pagedResourcesAssembler.toModel(notifications, NotificationModelAssembler(enhancers, notifications))
+  }
+}

backend/api/src/main/kotlin/io/tolgee/hateoas/notification/NotificationEnhancer.kt

@@ -0,0 +1,15 @@
+package io.tolgee.hateoas.notification
+
+import io.tolgee.model.Notification
+
+/**
+ * Dynamic component enhancing notifications by additional information if eligible,
+ * e.g. adding linked task.
+ */
+fun interface NotificationEnhancer {
+  /**
+   * Takes list of input Notification and output NotificationModel.
+   * It iterates over the pairs and alters the output NotificationModel by enhancing it of the new information.
+   */
+  fun enhanceNotifications(notifications: Map<Notification, NotificationModel>)
+}

backend/api/src/main/kotlin/io/tolgee/hateoas/notification/NotificationModel.kt

@@ -0,0 +1,12 @@
+package io.tolgee.hateoas.notification
+
+import io.tolgee.hateoas.project.SimpleProjectModel
+import io.tolgee.hateoas.task.TaskModel
+import org.springframework.hateoas.RepresentationModel
+import java.io.Serializable
+
+data class NotificationModel(
+  val id: Long,
+  var project: SimpleProjectModel? = null,
+  var linkedTask: TaskModel? = null,
+) : RepresentationModel<NotificationModel>(), Serializable

backend/api/src/main/kotlin/io/tolgee/hateoas/notification/NotificationModelAssembler.kt

@@ -0,0 +1,32 @@
+package io.tolgee.hateoas.notification
+
+import io.tolgee.api.v2.controllers.NotificationController
+import io.tolgee.model.Notification
+import org.springframework.data.domain.Page
+import org.springframework.hateoas.server.mvc.RepresentationModelAssemblerSupport
+
+class NotificationModelAssembler(
+  private val enhancers: List<NotificationEnhancer>,
+  private val notifications: Page<Notification>,
+) : RepresentationModelAssemblerSupport<Notification, NotificationModel>(
+    NotificationController::class.java,
+    NotificationModel::class.java,
+  ) {
+  private val prefetchedNotifications =
+    run {
+      val notificationsWithModel =
+        notifications.content.associateWith { notification ->
+          NotificationModel(
+            id = notification.id,
+          )
+        }
+      enhancers.forEach { enhancer ->
+        enhancer.enhanceNotifications(notificationsWithModel)
+      }
+      notificationsWithModel
+    }
+
+  override fun toModel(view: Notification): NotificationModel {
+    return prefetchedNotifications[view] ?: throw IllegalStateException("Notification $view was not found")
+  }
+}

backend/api/src/main/kotlin/io/tolgee/hateoas/notification/ProjectNotificationEnhancer.kt

@@ -0,0 +1,21 @@
+package io.tolgee.hateoas.notification
+
+import io.tolgee.hateoas.project.SimpleProjectModelAssembler
+import io.tolgee.model.Notification
+import io.tolgee.service.project.ProjectService
+import org.springframework.stereotype.Component
+
+@Component
+class ProjectNotificationEnhancer(
+  private val projectService: ProjectService,
+  private val simpleProjectModelAssembler: SimpleProjectModelAssembler,
+) : NotificationEnhancer {
+  override fun enhanceNotifications(notifications: Map<Notification, NotificationModel>) {
+    val projectIds = notifications.mapNotNull { (source, _) -> source.project?.id }.distinct()
+    val projects = projectService.findAll(projectIds).associateBy { it.id }
+
+    notifications.forEach { (source, target) ->
+      target.project = source.project?.id.let { projects[it] }?.let { simpleProjectModelAssembler.toModel(it) }
+    }
+  }
+}

backend/app/src/test/kotlin/io/tolgee/api/v2/controllers/NotificationControllerTest.kt

@@ -0,0 +1,41 @@
+package io.tolgee.api.v2.controllers
+
+import io.tolgee.development.testDataBuilder.data.NotificationsTestData
+import io.tolgee.fixtures.andAssertThatJson
+import io.tolgee.testing.AuthorizedControllerTest
+import org.junit.jupiter.api.Test
+
+class NotificationControllerTest : AuthorizedControllerTest() {
+  @Test
+  fun `gets notifications from newest`() {
+    val testData = NotificationsTestData()
+
+    (101L..103).forEach { i ->
+      executeInNewTransaction {
+        val task =
+          testData.projectBuilder.addTask {
+            this.name = "Notification task $i"
+            this.language = testData.englishLanguage
+            this.author = testData.originatingUser.self
+            this.number = i
+          }
+
+        testData.userAccountBuilder.addNotification {
+          this.user = testData.user
+          this.project = testData.project
+          this.linkedTask = task.self
+          this.originatingUser = testData.originatingUser.self
+        }
+      }
+    }
+
+    testDataService.saveTestData(testData.root)
+    loginAsUser(testData.user.username)
+
+    performAuthGet("/v2/notifications").andAssertThatJson {
+      node("_embedded.notificationModelList[0].linkedTask.name").isEqualTo("Notification task 103")
+      node("_embedded.notificationModelList[1].linkedTask.name").isEqualTo("Notification task 102")
+      node("_embedded.notificationModelList[2].linkedTask.name").isEqualTo("Notification task 101")
+    }
+  }
+}

backend/data/src/main/kotlin/io/tolgee/development/testDataBuilder/TestDataService.kt

@@ -2,15 +2,7 @@ package io.tolgee.development.testDataBuilder
 
 import io.tolgee.activity.ActivityHolder
 import io.tolgee.component.eventListeners.LanguageStatsListener
-import io.tolgee.development.testDataBuilder.builders.BatchJobBuilder
-import io.tolgee.development.testDataBuilder.builders.ImportBuilder
-import io.tolgee.development.testDataBuilder.builders.KeyBuilder
-import io.tolgee.development.testDataBuilder.builders.PatBuilder
-import io.tolgee.development.testDataBuilder.builders.ProjectBuilder
-import io.tolgee.development.testDataBuilder.builders.TestDataBuilder
-import io.tolgee.development.testDataBuilder.builders.TranslationBuilder
-import io.tolgee.development.testDataBuilder.builders.UserAccountBuilder
-import io.tolgee.development.testDataBuilder.builders.UserPreferencesBuilder
+import io.tolgee.development.testDataBuilder.builders.*
 import io.tolgee.development.testDataBuilder.builders.slack.SlackUserConnectionBuilder
 import io.tolgee.service.TenantService
 import io.tolgee.service.automations.AutomationService
@@ -25,6 +17,7 @@ import io.tolgee.service.key.TagService
 import io.tolgee.service.language.LanguageService
 import io.tolgee.service.machineTranslation.MtCreditBucketService
 import io.tolgee.service.machineTranslation.MtServiceConfigService
+import io.tolgee.service.notification.NotificationService
 import io.tolgee.service.organization.OrganizationRoleService
 import io.tolgee.service.organization.OrganizationService
 import io.tolgee.service.project.LanguageStatsService
@@ -75,6 +68,7 @@ class TestDataService(
   private val userPreferencesService: UserPreferencesService,
   private val languageStatsService: LanguageStatsService,
   private val patService: PatService,
+  private val notificationService: NotificationService,
   private val namespaceService: NamespaceService,
   private val bigMetaService: BigMetaService,
   private val activityHolder: ActivityHolder,
@@ -114,6 +108,7 @@ class TestDataService(
 
     executeInNewTransaction(transactionManager) {
       saveProjectData(builder)
+      saveNotifications(builder)
       finalize()
     }
 
@@ -464,6 +459,15 @@ class TestDataService(
     }
   }
 
+  private fun saveNotifications(builder: TestDataBuilder) {
+    builder.data.userAccounts
+      .flatMap { it.data.notifications }
+      .sortedBy { it.self.linkedTask?.name }
+      .forEach {
+        notificationService.save(it.self)
+      }
+  }
+
   private fun saveUserPreferences(data: List<UserPreferencesBuilder>) {
     data.forEach { userPreferencesService.save(it.self) }
   }

backend/data/src/main/kotlin/io/tolgee/development/testDataBuilder/builders/NotificationBuilder.kt

@@ -0,0 +1,13 @@
+package io.tolgee.development.testDataBuilder.builders
+
+import io.tolgee.development.testDataBuilder.EntityDataBuilder
+import io.tolgee.model.Notification
+
+class NotificationBuilder(
+  val userAccountBuilder: UserAccountBuilder,
+) : EntityDataBuilder<Notification, NotificationBuilder> {
+  override var self: Notification =
+    Notification().apply {
+      this.user = userAccountBuilder.self
+    }
+}

backend/data/src/main/kotlin/io/tolgee/development/testDataBuilder/builders/UserAccountBuilder.kt

@@ -2,6 +2,7 @@ package io.tolgee.development.testDataBuilder.builders
 
 import io.tolgee.development.testDataBuilder.FT
 import io.tolgee.development.testDataBuilder.builders.slack.SlackUserConnectionBuilder
+import io.tolgee.model.Notification
 import io.tolgee.model.Pat
 import io.tolgee.model.UserAccount
 import io.tolgee.model.UserPreferences
@@ -20,6 +21,7 @@ class UserAccountBuilder(
     var userPreferences: UserPreferencesBuilder? = null
     var pats: MutableList<PatBuilder> = mutableListOf()
     var slackUserConnections: MutableList<SlackUserConnectionBuilder> = mutableListOf()
+    var notifications: MutableList<NotificationBuilder> = mutableListOf()
   }
 
   var data = DATA()
@@ -37,4 +39,6 @@ class UserAccountBuilder(
   fun addPat(ft: FT<Pat>) = addOperation(data.pats, ft)
 
   fun addSlackUserConnection(ft: FT<SlackUserConnection>) = addOperation(data.slackUserConnections, ft)
+
+  fun addNotification(ft: FT<Notification>) = addOperation(data.notifications, ft)
 }

backend/data/src/main/kotlin/io/tolgee/development/testDataBuilder/data/NotificationsTestData.kt

@@ -0,0 +1,26 @@
+package io.tolgee.development.testDataBuilder.data
+
+class NotificationsTestData : BaseTestData() {
+  val originatingUser =
+    root.addUserAccount {
+      name = "originating user"
+      username = "originatingUser"
+    }
+
+  val task =
+    projectBuilder.addTask {
+      this.name = "Notification task"
+      this.language = englishLanguage
+      this.author = originatingUser.self
+    }
+
+  val notificationBuilder =
+    userAccountBuilder.addNotification {
+      this.user = [email protected]
+      this.project = [email protected]
+      this.linkedTask = task.self
+      this.originatingUser = [email protected]
+    }
+
+  val notification = notificationBuilder.self
+}

backend/data/src/main/kotlin/io/tolgee/model/Notification.kt

@@ -0,0 +1,24 @@
+package io.tolgee.model
+
+import io.tolgee.model.task.Task
+import jakarta.persistence.*
+
+@Entity
+@Table(
+  indexes = [
+    Index(columnList = "user_id"),
+  ],
+)
+class Notification : StandardAuditModel() {
+  @ManyToOne(fetch = FetchType.LAZY)
+  lateinit var user: UserAccount
+
+  @ManyToOne(fetch = FetchType.LAZY)
+  var project: Project? = null
+
+  @ManyToOne(fetch = FetchType.LAZY)
+  var originatingUser: UserAccount? = null
+
+  @ManyToOne(fetch = FetchType.LAZY)
+  var linkedTask: Task? = null
+}

backend/data/src/main/kotlin/io/tolgee/repository/NotificationRepository.kt

@@ -0,0 +1,29 @@
+package io.tolgee.repository
+
+import io.tolgee.model.Notification
+import org.springframework.context.annotation.Lazy
+import org.springframework.data.domain.Page
+import org.springframework.data.domain.Pageable
+import org.springframework.data.jpa.repository.JpaRepository
+import org.springframework.data.jpa.repository.Query
+import org.springframework.stereotype.Repository
+
+@Repository
+@Lazy
+interface NotificationRepository : JpaRepository<Notification, Long> {
+  @Query(
+    """
+    SELECT n
+     FROM Notification n
+     LEFT JOIN FETCH n.user AS u
+     LEFT JOIN FETCH n.originatingUser
+     LEFT JOIN FETCH n.linkedTask
+     WHERE u.id = :userId
+     ORDER BY n.id DESC
+    """,
+  )
+  fun fetchNotificationsByUserId(
+    userId: Long,
+    pageable: Pageable,
+  ): Page<Notification>
+}

backend/data/src/main/kotlin/io/tolgee/service/notification/NotificationService.kt

@@ -0,0 +1,23 @@
+package io.tolgee.service.notification
+
+import io.tolgee.model.Notification
+import io.tolgee.repository.NotificationRepository
+import org.springframework.data.domain.Page
+import org.springframework.data.domain.Pageable
+import org.springframework.stereotype.Service
+
+@Service
+class NotificationService(
+  private val notificationRepository: NotificationRepository,
+) {
+  fun getNotifications(
+    userId: Long,
+    pageable: Pageable,
+  ): Page<Notification> {
+    return notificationRepository.fetchNotificationsByUserId(userId, pageable)
+  }
+
+  fun save(notification: Notification) {
+    notificationRepository.save(notification)
+  }
+}

backend/data/src/main/kotlin/io/tolgee/service/project/ProjectService.kt

@@ -136,6 +136,10 @@ class ProjectService(
     return projectRepository.find(id)
   }
 
+  fun findAll(ids: List<Long>): List<Project> {
+    return projectRepository.findAllById(ids)
+  }
+
   @Transactional
   fun getView(id: Long): ProjectWithLanguagesView {
     val perms = permissionService.getProjectPermissionData(id, authenticationFacade.authenticatedUser.id)