feat: Improve announcements API (#192)

Announcements can have tags now instead of being grouped into a single channel. You can get an announcement using its ID. You can page announcements and filter them by tags and whether they are archived. You can see a list of all available tags. Some route API overhaul.

README.md

@@ -75,7 +75,7 @@ with updates and ReVanced Patches.
 
 Some of the features ReVanced API include:
 
-- 📢 **Announcements**: Post and get announcements grouped by channels
+- 📢 **Announcements**: Post and get announcements
 - ℹ️ **About**: Get more information such as a description, ways to donate to, 
 and links of the hoster of ReVanced API
 - 🧩 **Patches**: Get the latest updates of ReVanced Patches, directly from ReVanced API

build.gradle.kts

@@ -48,6 +48,12 @@ kotlin {
     }
 }
 
+tasks {
+    test {
+        useJUnitPlatform()
+    }
+}
+
 repositories {
     mavenCentral()
     google()
@@ -98,6 +104,8 @@ dependencies {
     implementation(libs.caffeine)
     implementation(libs.bouncy.castle.provider)
     implementation(libs.bouncy.castle.pgp)
+
+    testImplementation(kotlin("test"))
 }
 
 // The maven-publish plugin is necessary to make signing work.

src/main/kotlin/app/revanced/api/configuration/repository/AnnouncementRepository.kt

@@ -1,10 +1,10 @@
 package app.revanced.api.configuration.repository
 
-import app.revanced.api.configuration.schema.APIAnnouncement
+import app.revanced.api.configuration.schema.ApiAnnouncement
-import app.revanced.api.configuration.schema.APIResponseAnnouncement
+import app.revanced.api.configuration.schema.ApiAnnouncementTag
-import app.revanced.api.configuration.schema.APIResponseAnnouncementId
+import app.revanced.api.configuration.schema.ApiResponseAnnouncement
+import app.revanced.api.configuration.schema.ApiResponseAnnouncementId
 import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.awaitAll
 import kotlinx.coroutines.runBlocking
 import kotlinx.datetime.*
 import org.jetbrains.exposed.dao.IntEntity
@@ -15,126 +15,175 @@ import org.jetbrains.exposed.sql.*
 import org.jetbrains.exposed.sql.kotlin.datetime.CurrentDateTime
 import org.jetbrains.exposed.sql.kotlin.datetime.datetime
 import org.jetbrains.exposed.sql.transactions.experimental.newSuspendedTransaction
-import org.jetbrains.exposed.sql.transactions.experimental.suspendedTransactionAsync
+import java.time.LocalDateTime
 
 internal class AnnouncementRepository {
-    // This is better than doing a maxByOrNull { it.id }.
+    // This is better than doing a maxByOrNull { it.id } on every request.
     private var latestAnnouncement: Announcement? = null
-    private val latestAnnouncementByChannel = mutableMapOf<String, Announcement>()
+    private val latestAnnouncementByTag = mutableMapOf<Int, Announcement>()
-
-    private fun updateLatestAnnouncement(new: Announcement) {
-        if (latestAnnouncement?.id?.value == new.id.value) {
-            latestAnnouncement = new
-            latestAnnouncementByChannel[new.channel ?: return] = new
-        }
-    }
 
     init {
         runBlocking {
             transaction {
-                SchemaUtils.create(Announcements, Attachments)
+                SchemaUtils.create(
+                    Announcements,
+                    Attachments,
+                    Tags,
+                    AnnouncementTags,
+                )
 
-                // Initialize the latest announcement.
+                initializeLatestAnnouncements()
-                latestAnnouncement = Announcement.all().onEach {
-                    latestAnnouncementByChannel[it.channel ?: return@onEach] = it
-                }.maxByOrNull { it.id } ?: return@transaction
             }
         }
     }
 
-    suspend fun all() = transaction {
+    private fun initializeLatestAnnouncements() {
-        Announcement.all().map { it.toApi() }
+        latestAnnouncement = Announcement.all().orderBy(Announcements.id to SortOrder.DESC).firstOrNull()
+
+        Tag.all().map { it.id.value }.forEach(::updateLatestAnnouncementForTag)
     }
 
-    suspend fun all(channel: String) = transaction {
+    private fun updateLatestAnnouncement(new: Announcement) {
-        Announcement.find { Announcements.channel eq channel }.map { it.toApi() }
+        if (latestAnnouncement == null || latestAnnouncement!!.id.value <= new.id.value) {
+            latestAnnouncement = new
+            new.tags.forEach { tag -> latestAnnouncementByTag[tag.id.value] = new }
+        }
+    }
+
+    private fun updateLatestAnnouncementForTag(tag: Int) {
+        val latestAnnouncementForTag = AnnouncementTags.select(AnnouncementTags.announcement)
+            .where { AnnouncementTags.tag eq tag }
+            .map { it[AnnouncementTags.announcement] }
+            .mapNotNull { Announcement.findById(it) }
+            .maxByOrNull { it.id }
+
+        latestAnnouncementForTag?.let { latestAnnouncementByTag[tag] = it }
+    }
+
+    suspend fun latest() = transaction {
+        latestAnnouncement.toApiResponseAnnouncement()
+    }
+
+    suspend fun latest(tags: Set<Int>) = transaction {
+        tags.mapNotNull { tag -> latestAnnouncementByTag[tag] }.toApiAnnouncement()
+    }
+
+    fun latestId() = latestAnnouncement?.id?.value.toApiResponseAnnouncementId()
+
+    fun latestId(tags: Set<Int>) =
+        tags.map { tag -> latestAnnouncementByTag[tag]?.id?.value }.toApiResponseAnnouncementId()
+
+    suspend fun paged(cursor: Int, count: Int, tags: Set<Int>?, archived: Boolean) = transaction {
+        Announcement.find {
+            fun idLessEq() = Announcements.id lessEq cursor
+            fun archivedAtIsNull() = Announcements.archivedAt.isNull()
+            fun archivedAtGreaterNow() = Announcements.archivedAt greater LocalDateTime.now().toKotlinLocalDateTime()
+
+            if (tags == null) {
+                if (archived) {
+                    idLessEq()
+                } else {
+                    idLessEq() and (archivedAtIsNull() or archivedAtGreaterNow())
+                }
+            } else {
+                fun archivedAtGreaterOrNullOrTrue() = if (archived) {
+                    Op.TRUE
+                } else {
+                    archivedAtIsNull() or archivedAtGreaterNow()
+                }
+
+                fun hasTags() = tags.mapNotNull { Tag.findById(it)?.id }.let { tags ->
+                    Announcements.id inSubQuery Announcements.leftJoin(AnnouncementTags)
+                        .select(AnnouncementTags.announcement)
+                        .where { AnnouncementTags.tag inList tags }
+                        .withDistinct()
+                }
+
+                idLessEq() and archivedAtGreaterOrNullOrTrue() and hasTags()
+            }
+        }.orderBy(Announcements.id to SortOrder.DESC).limit(count).toApiAnnouncement()
+    }
+
+    suspend fun get(id: Int) = transaction {
+        Announcement.findById(id).toApiResponseAnnouncement()
+    }
+
+    suspend fun new(new: ApiAnnouncement) = transaction {
+        Announcement.new {
+            author = new.author
+            title = new.title
+            content = new.content
+            archivedAt = new.archivedAt
+            level = new.level
+            tags = SizedCollection(
+                new.tags.map { tag -> Tag.find { Tags.name eq tag }.firstOrNull() ?: Tag.new { name = tag } },
+            )
+        }.apply {
+            new.attachments.map { attachmentUrl ->
+                Attachment.new {
+                    url = attachmentUrl
+                    announcement = this@apply
+                }
+            }
+        }.let(::updateLatestAnnouncement)
+    }
+
+    suspend fun update(id: Int, new: ApiAnnouncement) = transaction {
+        Announcement.findByIdAndUpdate(id) {
+            it.author = new.author
+            it.title = new.title
+            it.content = new.content
+            it.archivedAt = new.archivedAt
+            it.level = new.level
+
+            // Get the old tags, create new tags if they don't exist,
+            // and delete tags that are not in the new tags, after updating the announcement.
+            val oldTags = it.tags.toList()
+            val updatedTags = new.tags.map { name ->
+                Tag.find { Tags.name eq name }.firstOrNull() ?: Tag.new { this.name = name }
+            }
+            it.tags = SizedCollection(updatedTags)
+            oldTags.forEach { tag ->
+                if (tag in updatedTags || !tag.announcements.empty()) return@forEach
+                tag.delete()
+            }
+
+            // Delete old attachments and create new attachments.
+            it.attachments.forEach { attachment -> attachment.delete() }
+            new.attachments.map { attachment ->
+                Attachment.new {
+                    url = attachment
+                    announcement = it
+                }
+            }
+        }?.let(::updateLatestAnnouncement) ?: Unit
     }
 
     suspend fun delete(id: Int) = transaction {
         val announcement = Announcement.findById(id) ?: return@transaction
 
+        // Delete the tag if no other announcements are referencing it.
+        // One count means that the announcement is the only one referencing the tag.
+        announcement.tags.filter { tag -> tag.announcements.count() == 1L }.forEach { tag ->
+            latestAnnouncementByTag -= tag.id.value
+            tag.delete()
+        }
+
         announcement.delete()
 
-        // In case the latest announcement was deleted, query the new latest announcement again.
+        // If the deleted announcement is the latest announcement, set the new latest announcement.
         if (latestAnnouncement?.id?.value == id) {
-            latestAnnouncement = Announcement.all().maxByOrNull { it.id }
+            latestAnnouncement = Announcement.all().orderBy(Announcements.id to SortOrder.DESC).firstOrNull()
+        }
 
-            // If no latest announcement was found, remove it from the channel map.
+        // The new announcement may be the latest for a specific tag. Set the new latest announcement for that tag.
-            if (latestAnnouncement == null) {
+        latestAnnouncementByTag.keys.forEach { tag ->
-                latestAnnouncementByChannel.remove(announcement.channel)
+            updateLatestAnnouncementForTag(tag)
-            } else {
-                latestAnnouncementByChannel[latestAnnouncement!!.channel ?: return@transaction] = latestAnnouncement!!
-            }
         }
     }
 
-    fun latest() = latestAnnouncement?.toApi()
+    suspend fun tags() = transaction {
-
+        Tag.all().toList().toApiTag()
-    fun latest(channel: String) = latestAnnouncementByChannel[channel]?.toApi()
-
-    fun latestId() = latest()?.id?.toApi()
-
-    fun latestId(channel: String) = latest(channel)?.id?.toApi()
-
-    suspend fun archive(
-        id: Int,
-        archivedAt: LocalDateTime?,
-    ) = transaction {
-        Announcement.findByIdAndUpdate(id) {
-            it.archivedAt = archivedAt ?: java.time.LocalDateTime.now().toKotlinLocalDateTime()
-        }?.also(::updateLatestAnnouncement)
-    }
-
-    suspend fun unarchive(id: Int) = transaction {
-        Announcement.findByIdAndUpdate(id) {
-            it.archivedAt = null
-        }?.also(::updateLatestAnnouncement)
-    }
-
-    suspend fun new(new: APIAnnouncement) = transaction {
-        Announcement.new {
-            author = new.author
-            title = new.title
-            content = new.content
-            channel = new.channel
-            archivedAt = new.archivedAt
-            level = new.level
-        }.also { newAnnouncement ->
-            new.attachmentUrls.map { newUrl ->
-                suspendedTransactionAsync {
-                    Attachment.new {
-                        url = newUrl
-                        announcement = newAnnouncement
-                    }
-                }
-            }.awaitAll()
-        }.also(::updateLatestAnnouncement)
-    }
-
-    suspend fun update(id: Int, new: APIAnnouncement) = transaction {
-        Announcement.findByIdAndUpdate(id) {
-            it.author = new.author
-            it.title = new.title
-            it.content = new.content
-            it.channel = new.channel
-            it.archivedAt = new.archivedAt
-            it.level = new.level
-        }?.also { newAnnouncement ->
-            newAnnouncement.attachments.map {
-                suspendedTransactionAsync {
-                    it.delete()
-                }
-            }.awaitAll()
-
-            new.attachmentUrls.map { newUrl ->
-                suspendedTransactionAsync {
-                    Attachment.new {
-                        url = newUrl
-                        announcement = newAnnouncement
-                    }
-                }
-            }.awaitAll()
-        }?.also(::updateLatestAnnouncement)
     }
 
     private suspend fun <T> transaction(statement: suspend Transaction.() -> T) =
@@ -144,7 +193,6 @@ internal class AnnouncementRepository {
         val author = varchar("author", 32).nullable()
         val title = varchar("title", 64)
         val content = text("content").nullable()
-        val channel = varchar("channel", 16).nullable()
         val createdAt = datetime("createdAt").defaultExpression(CurrentDateTime)
         val archivedAt = datetime("archivedAt").nullable()
         val level = integer("level")
@@ -155,6 +203,19 @@ internal class AnnouncementRepository {
         val announcement = reference("announcement", Announcements, onDelete = ReferenceOption.CASCADE)
     }
 
+    private object Tags : IntIdTable() {
+        val name = varchar("name", 16).uniqueIndex()
+    }
+
+    private object AnnouncementTags : Table() {
+        val tag = reference("tag", Tags, onDelete = ReferenceOption.CASCADE)
+        val announcement = reference("announcement", Announcements, onDelete = ReferenceOption.CASCADE)
+
+        init {
+            uniqueIndex(tag, announcement)
+        }
+    }
+
     class Announcement(id: EntityID<Int>) : IntEntity(id) {
         companion object : IntEntityClass<Announcement>(Announcements)
 
@@ -162,7 +223,7 @@ internal class AnnouncementRepository {
         var title by Announcements.title
         var content by Announcements.content
         val attachments by Attachment referrersOn Attachments.announcement
-        var channel by Announcements.channel
+        var tags by Tag via AnnouncementTags
         var createdAt by Announcements.createdAt
         var archivedAt by Announcements.archivedAt
         var level by Announcements.level
@@ -175,17 +236,32 @@ internal class AnnouncementRepository {
         var announcement by Announcement referencedOn Attachments.announcement
     }
 
-    private fun Announcement.toApi() = APIResponseAnnouncement(
+    class Tag(id: EntityID<Int>) : IntEntity(id) {
-        id.value,
+        companion object : IntEntityClass<Tag>(Tags)
-        author,
-        title,
-        content,
-        attachments.map { it.url },
-        channel,
-        createdAt,
-        archivedAt,
-        level,
-    )
 
-    private fun Int.toApi() = APIResponseAnnouncementId(this)
+        var name by Tags.name
+        var announcements by Announcement via AnnouncementTags
+    }
+
+    private fun Announcement?.toApiResponseAnnouncement() = this?.let {
+        ApiResponseAnnouncement(
+            id.value,
+            author,
+            title,
+            content,
+            attachments.map { it.url },
+            tags.map { it.id.value },
+            createdAt,
+            archivedAt,
+            level,
+        )
+    }
+
+    private fun Iterable<Announcement>.toApiAnnouncement() = map { it.toApiResponseAnnouncement()!! }
+
+    private fun Iterable<Tag>.toApiTag() = map { ApiAnnouncementTag(it.id.value, it.name) }
+
+    private fun Int?.toApiResponseAnnouncementId() = this?.let { ApiResponseAnnouncementId(this) }
+
+    private fun Iterable<Int?>.toApiResponseAnnouncementId() = map { it.toApiResponseAnnouncementId() }
 }

src/main/kotlin/app/revanced/api/configuration/routes/Announcements.kt

@@ -4,10 +4,9 @@ import app.revanced.api.configuration.canRespondUnauthorized
 import app.revanced.api.configuration.installCache
 import app.revanced.api.configuration.installNotarizedRoute
 import app.revanced.api.configuration.respondOrNotFound
-import app.revanced.api.configuration.schema.APIAnnouncement
+import app.revanced.api.configuration.schema.ApiAnnouncement
-import app.revanced.api.configuration.schema.APIAnnouncementArchivedAt
+import app.revanced.api.configuration.schema.ApiResponseAnnouncement
-import app.revanced.api.configuration.schema.APIResponseAnnouncement
+import app.revanced.api.configuration.schema.ApiResponseAnnouncementId
-import app.revanced.api.configuration.schema.APIResponseAnnouncementId
 import app.revanced.api.configuration.services.AnnouncementService
 import io.bkbn.kompendium.core.metadata.*
 import io.bkbn.kompendium.json.schema.definition.TypeDefinition
@@ -16,7 +15,6 @@ import io.ktor.http.*
 import io.ktor.server.application.*
 import io.ktor.server.auth.*
 import io.ktor.server.plugins.ratelimit.*
-import io.ktor.server.request.*
 import io.ktor.server.response.*
 import io.ktor.server.routing.*
 import io.ktor.server.util.*
@@ -32,76 +30,63 @@ internal fun Route.announcementsRoute() = route("announcements") {
 
     rateLimit(RateLimitName("strong")) {
         get {
-            call.respond(announcementService.all())
+            val cursor = call.parameters["cursor"]?.toInt() ?: Int.MAX_VALUE
+            val count = call.parameters["count"]?.toInt() ?: 16
+            val tags = call.parameters.getAll("tag")
+            val archived = call.parameters["archived"]?.toBoolean() ?: true
+
+            call.respond(announcementService.paged(cursor, count, tags?.map { it.toInt() }?.toSet(), archived))
         }
     }
 
-    rateLimit(RateLimitName("strong")) {
+    rateLimit(RateLimitName("weak")) {
-        route("{channel}/latest") {
-            installLatestChannelAnnouncementRouteDocumentation()
-
-            get {
-                val channel: String by call.parameters
-
-                call.respondOrNotFound(announcementService.latest(channel))
-            }
-
-            route("id") {
-                installLatestChannelAnnouncementIdRouteDocumentation()
-
-                get {
-                    val channel: String by call.parameters
-
-                    call.respondOrNotFound(announcementService.latestId(channel))
-                }
-            }
-        }
-    }
-
-    rateLimit(RateLimitName("strong")) {
-        route("{channel}") {
-            installChannelAnnouncementsRouteDocumentation()
-
-            get {
-                val channel: String by call.parameters
-
-                call.respond(announcementService.all(channel))
-            }
-        }
-    }
-
-    rateLimit(RateLimitName("strong")) {
-        route("latest") {
-            installLatestAnnouncementRouteDocumentation()
-
-            get {
-                call.respondOrNotFound(announcementService.latest())
-            }
-
-            route("id") {
-                installLatestAnnouncementIdRouteDocumentation()
-
-                get {
-                    call.respondOrNotFound(announcementService.latestId())
-                }
-            }
-        }
-    }
-
-    rateLimit(RateLimitName("strong")) {
         authenticate("jwt") {
-            installAnnouncementRouteDocumentation()
+            post<ApiAnnouncement> { announcement ->
-
-            post<APIAnnouncement> { announcement ->
                 announcementService.new(announcement)
 
                 call.respond(HttpStatusCode.OK)
             }
+        }
 
-            route("{id}") {
+        route("latest") {
-                installAnnouncementIdRouteDocumentation()
+            installAnnouncementsLatestRouteDocumentation()
 
-                patch<APIAnnouncement> { announcement ->
+            get {
+                val tags = call.parameters.getAll("tag")
+
+                if (tags?.isNotEmpty() == true) {
+                    call.respond(announcementService.latest(tags.map { it.toInt() }.toSet()))
+                } else {
+                    call.respondOrNotFound(announcementService.latest())
+                }
+            }
+
+            route("id") {
+                installAnnouncementsLatestIdRouteDocumentation()
+
+                get {
+                    val tags = call.parameters.getAll("tag")
+
+                    if (tags?.isNotEmpty() == true) {
+                        call.respond(announcementService.latestId(tags.map { it.toInt() }.toSet()))
+                    } else {
+                        call.respondOrNotFound(announcementService.latestId())
+                    }
+                }
+            }
+        }
+
+        route("{id}") {
+            installAnnouncementsIdRouteDocumentation()
+
+            get {
+                val id: Int by call.parameters
+
+                call.respondOrNotFound(announcementService.get(id))
+            }
+
+            authenticate("jwt") {
+                patch<ApiAnnouncement> { announcement ->
                     val id: Int by call.parameters
 
                     announcementService.update(id, announcement)
@@ -116,31 +101,14 @@ internal fun Route.announcementsRoute() = route("announcements") {
 
                     call.respond(HttpStatusCode.OK)
                 }
+            }
+        }
 
-                route("archive") {
+        route("tags") {
-                    installAnnouncementArchiveRouteDocumentation()
+            installAnnouncementsTagsRouteDocumentation()
 
-                    post {
+            get {
-                        val id: Int by call.parameters
+                call.respond(announcementService.tags())
-                        val archivedAt = call.receiveNullable<APIAnnouncementArchivedAt>()?.archivedAt
-
-                        announcementService.archive(id, archivedAt)
-
-                        call.respond(HttpStatusCode.OK)
-                    }
-                }
-
-                route("unarchive") {
-                    installAnnouncementUnarchiveRouteDocumentation()
-
-                    post {
-                        val id: Int by call.parameters
-
-                        announcementService.unarchive(id)
-
-                        call.respond(HttpStatusCode.OK)
-                    }
-                }
             }
         }
     }
@@ -154,16 +122,56 @@ private val authHeaderParameter = Parameter(
     examples = mapOf("Bearer authentication" to Parameter.Example("Bearer abc123")),
 )
 
-private fun Route.installAnnouncementRouteDocumentation() = installNotarizedRoute {
+private fun Route.installAnnouncementsRouteDocumentation() = installNotarizedRoute {
     tags = setOf("Announcements")
 
-    parameters = listOf(authHeaderParameter)
+    get = GetInfo.builder {
+        description("Get a page of announcements")
+        summary("Get announcements")
+        parameters(
+            Parameter(
+                name = "cursor",
+                `in` = Parameter.Location.query,
+                schema = TypeDefinition.INT,
+                description = "The offset of the announcements. Default is Int.MAX_VALUE (Newest first)",
+                required = false,
+            ),
+            Parameter(
+                name = "count",
+                `in` = Parameter.Location.query,
+                schema = TypeDefinition.INT,
+                description = "The count of the announcements. Default is 16",
+                required = false,
+            ),
+            Parameter(
+                name = "tag",
+                `in` = Parameter.Location.query,
+                schema = TypeDefinition.INT,
+                description = "The tag IDs to filter the announcements by. Default is all tags",
+                required = false,
+            ),
+            Parameter(
+                name = "archived",
+                `in` = Parameter.Location.query,
+                schema = TypeDefinition.BOOLEAN,
+                description = "Whether to include archived announcements. Default is true",
+                required = false,
+            ),
+        )
+        response {
+            responseCode(HttpStatusCode.OK)
+            mediaTypes("application/json")
+            description("The announcements")
+            responseType<Set<ApiResponseAnnouncement>>()
+        }
+    }
 
     post = PostInfo.builder {
         description("Create a new announcement")
         summary("Create announcement")
+        parameters(authHeaderParameter)
         request {
-            requestType<APIAnnouncement>()
+            requestType<ApiAnnouncement>()
             description("The new announcement")
         }
         response {
@@ -175,17 +183,32 @@ private fun Route.installAnnouncementRouteDocumentation() = installNotarizedRout
     }
 }
 
-private fun Route.installLatestAnnouncementRouteDocumentation() = installNotarizedRoute {
+private fun Route.installAnnouncementsLatestRouteDocumentation() = installNotarizedRoute {
     tags = setOf("Announcements")
 
     get = GetInfo.builder {
         description("Get the latest announcement")
         summary("Get latest announcement")
+        parameters(
+            Parameter(
+                name = "tag",
+                `in` = Parameter.Location.query,
+                schema = TypeDefinition.INT,
+                description = "The tag IDs to filter the latest announcements by",
+                required = false,
+            ),
+        )
         response {
             responseCode(HttpStatusCode.OK)
             mediaTypes("application/json")
             description("The latest announcement")
-            responseType<APIResponseAnnouncement>()
+            responseType<ApiResponseAnnouncement>()
+        }
+        canRespond {
+            responseCode(HttpStatusCode.OK)
+            mediaTypes("application/json")
+            description("The latest announcements")
+            responseType<Set<ApiResponseAnnouncement>>()
         }
         canRespond {
             responseCode(HttpStatusCode.NotFound)
@@ -195,17 +218,32 @@ private fun Route.installLatestAnnouncementRouteDocumentation() = installNotariz
     }
 }
 
-private fun Route.installLatestAnnouncementIdRouteDocumentation() = installNotarizedRoute {
+private fun Route.installAnnouncementsLatestIdRouteDocumentation() = installNotarizedRoute {
     tags = setOf("Announcements")
 
     get = GetInfo.builder {
-        description("Get the id of the latest announcement")
+        description("Get the ID of the latest announcement")
-        summary("Get id of latest announcement")
+        summary("Get ID of latest announcement")
+        parameters(
+            Parameter(
+                name = "tag",
+                `in` = Parameter.Location.query,
+                schema = TypeDefinition.INT,
+                description = "The tag IDs to filter the latest announcements by",
+                required = false,
+            ),
+        )
         response {
             responseCode(HttpStatusCode.OK)
             mediaTypes("application/json")
-            description("The id of the latest announcement")
+            description("The ID of the latest announcement")
-            responseType<APIResponseAnnouncementId>()
+            responseType<ApiResponseAnnouncementId>()
+        }
+        canRespond {
+            responseCode(HttpStatusCode.OK)
+            mediaTypes("application/json")
+            description("The IDs of the latest announcements")
+            responseType<Set<ApiResponseAnnouncement>>()
         }
         canRespond {
             responseCode(HttpStatusCode.NotFound)
@@ -215,109 +253,40 @@ private fun Route.installLatestAnnouncementIdRouteDocumentation() = installNotar
     }
 }
 
-private fun Route.installChannelAnnouncementsRouteDocumentation() = installNotarizedRoute {
+private fun Route.installAnnouncementsIdRouteDocumentation() = installNotarizedRoute {
     tags = setOf("Announcements")
 
     parameters = listOf(
         Parameter(
-            name = "channel",
+            name = "id",
             `in` = Parameter.Location.path,
-            schema = TypeDefinition.STRING,
+            schema = TypeDefinition.INT,
-            description = "The channel to get the announcements from",
+            description = "The ID of the announcement to update",
             required = true,
         ),
+        authHeaderParameter,
     )
 
     get = GetInfo.builder {
-        description("Get the announcements from a channel")
+        description("Get an announcement")
-        summary("Get announcements from channel")
+        summary("Get announcement")
         response {
+            description("The announcement")
             responseCode(HttpStatusCode.OK)
-            mediaTypes("application/json")
+            responseType<ApiResponseAnnouncement>()
-            description("The announcements in the channel")
-            responseType<Set<APIResponseAnnouncement>>()
         }
-    }
+        canRespond {
-}
+            responseCode(HttpStatusCode.NotFound)
-
+            description("The announcement does not exist")
-private fun Route.installAnnouncementArchiveRouteDocumentation() = installNotarizedRoute {
-    tags = setOf("Announcements")
-
-    parameters = listOf(
-        Parameter(
-            name = "id",
-            `in` = Parameter.Location.path,
-            schema = TypeDefinition.INT,
-            description = "The id of the announcement to archive",
-            required = true,
-        ),
-        Parameter(
-            name = "archivedAt",
-            `in` = Parameter.Location.query,
-            schema = TypeDefinition.STRING,
-            description = "The date and time the announcement to be archived",
-            required = false,
-        ),
-        authHeaderParameter,
-    )
-
-    post = PostInfo.builder {
-        description("Archive an announcement")
-        summary("Archive announcement")
-        response {
-            description("The announcement is archived")
-            responseCode(HttpStatusCode.OK)
             responseType<Unit>()
         }
-        canRespondUnauthorized()
     }
-}
-
-private fun Route.installAnnouncementUnarchiveRouteDocumentation() = installNotarizedRoute {
-    tags = setOf("Announcements")
-
-    parameters = listOf(
-        Parameter(
-            name = "id",
-            `in` = Parameter.Location.path,
-            schema = TypeDefinition.INT,
-            description = "The id of the announcement to unarchive",
-            required = true,
-        ),
-        authHeaderParameter,
-    )
-
-    post = PostInfo.builder {
-        description("Unarchive an announcement")
-        summary("Unarchive announcement")
-        response {
-            description("The announcement is unarchived")
-            responseCode(HttpStatusCode.OK)
-            responseType<Unit>()
-        }
-        canRespondUnauthorized()
-    }
-}
-
-private fun Route.installAnnouncementIdRouteDocumentation() = installNotarizedRoute {
-    tags = setOf("Announcements")
-
-    parameters = listOf(
-        Parameter(
-            name = "id",
-            `in` = Parameter.Location.path,
-            schema = TypeDefinition.INT,
-            description = "The id of the announcement to update",
-            required = true,
-        ),
-        authHeaderParameter,
-    )
 
     patch = PatchInfo.builder {
         description("Update an announcement")
         summary("Update announcement")
         request {
-            requestType<APIAnnouncement>()
+            requestType<ApiAnnouncement>()
             description("The new announcement")
         }
         response {
@@ -340,77 +309,17 @@ private fun Route.installAnnouncementIdRouteDocumentation() = installNotarizedRo
     }
 }
 
-private fun Route.installAnnouncementsRouteDocumentation() = installNotarizedRoute {
+private fun Route.installAnnouncementsTagsRouteDocumentation() = installNotarizedRoute {
     tags = setOf("Announcements")
 
     get = GetInfo.builder {
-        description("Get the announcements")
+        description("Get all announcement tags")
-        summary("Get announcements")
+        summary("Get announcement tags")
         response {
             responseCode(HttpStatusCode.OK)
             mediaTypes("application/json")
-            description("The announcements")
+            description("The announcement tags")
-            responseType<Set<APIResponseAnnouncement>>()
+            responseType<Set<String>>()
-        }
-    }
-}
-
-private fun Route.installLatestChannelAnnouncementRouteDocumentation() = installNotarizedRoute {
-    tags = setOf("Announcements")
-
-    parameters = listOf(
-        Parameter(
-            name = "channel",
-            `in` = Parameter.Location.path,
-            schema = TypeDefinition.STRING,
-            description = "The channel to get the latest announcement from",
-            required = true,
-        ),
-    )
-
-    get = GetInfo.builder {
-        description("Get the latest announcement from a channel")
-        summary("Get latest channel announcement")
-        response {
-            responseCode(HttpStatusCode.OK)
-            mediaTypes("application/json")
-            description("The latest announcement in the channel")
-            responseType<APIResponseAnnouncement>()
-        }
-        canRespond {
-            responseCode(HttpStatusCode.NotFound)
-            description("The channel does not exist")
-            responseType<Unit>()
-        }
-    }
-}
-
-private fun Route.installLatestChannelAnnouncementIdRouteDocumentation() = installNotarizedRoute {
-    tags = setOf("Announcements")
-
-    parameters = listOf(
-        Parameter(
-            name = "channel",
-            `in` = Parameter.Location.path,
-            schema = TypeDefinition.STRING,
-            description = "The channel to get the latest announcement id from",
-            required = true,
-        ),
-    )
-
-    get = GetInfo.builder {
-        description("Get the id of the latest announcement from a channel")
-        summary("Get id of latest announcement from channel")
-        response {
-            responseCode(HttpStatusCode.OK)
-            mediaTypes("application/json")
-            description("The id of the latest announcement from the channel")
-            responseType<APIResponseAnnouncementId>()
-        }
-        canRespond {
-            responseCode(HttpStatusCode.NotFound)
-            description("The channel does not exist")
-            responseType<Unit>()
         }
     }
 }

src/main/kotlin/app/revanced/api/configuration/routes/ApiRoute.kt

@@ -115,7 +115,7 @@ private fun Route.installRateLimitRouteDocumentation() = installNotarizedRoute {
             description("The rate limit of the backend")
             mediaTypes("application/json")
             responseCode(HttpStatusCode.OK)
-            responseType<APIRateLimit>()
+            responseType<ApiRateLimit>()
         }
     }
 }
@@ -144,7 +144,7 @@ private fun Route.installTeamRouteDocumentation() = installNotarizedRoute {
             description("The list of team members")
             mediaTypes("application/json")
             responseCode(HttpStatusCode.OK)
-            responseType<Set<APIMember>>()
+            responseType<Set<ApiMember>>()
         }
     }
 }
@@ -195,7 +195,7 @@ private fun Route.installTokenRouteDocumentation() = installNotarizedRoute {
             description("The authorization token")
             mediaTypes("application/json")
             responseCode(HttpStatusCode.OK)
-            responseType<APIToken>()
+            responseType<ApiToken>()
         }
         canRespondUnauthorized()
     }

src/main/kotlin/app/revanced/api/configuration/routes/ManagerRoute.kt

@@ -1,9 +1,9 @@
 package app.revanced.api.configuration.routes
 
 import app.revanced.api.configuration.installNotarizedRoute
-import app.revanced.api.configuration.schema.APIManagerAsset
+import app.revanced.api.configuration.schema.ApiManagerAsset
-import app.revanced.api.configuration.schema.APIRelease
+import app.revanced.api.configuration.schema.ApiRelease
-import app.revanced.api.configuration.schema.APIReleaseVersion
+import app.revanced.api.configuration.schema.ApiReleaseVersion
 import app.revanced.api.configuration.services.ManagerService
 import io.bkbn.kompendium.core.metadata.GetInfo
 import io.ktor.http.*
@@ -53,7 +53,7 @@ private fun Route.installManagerRouteDocumentation(deprecated: Boolean) = instal
             description("The latest manager release")
             mediaTypes("application/json")
             responseCode(HttpStatusCode.OK)
-            responseType<APIRelease<APIManagerAsset>>()
+            responseType<ApiRelease<ApiManagerAsset>>()
         }
     }
 }
@@ -69,7 +69,7 @@ private fun Route.installManagerVersionRouteDocumentation(deprecated: Boolean) =
             description("The current manager release version")
             mediaTypes("application/json")
             responseCode(HttpStatusCode.OK)
-            responseType<APIReleaseVersion>()
+            responseType<ApiReleaseVersion>()
         }
     }
 }

src/main/kotlin/app/revanced/api/configuration/routes/PatchesRoute.kt

@@ -2,10 +2,10 @@ package app.revanced.api.configuration.routes
 
 import app.revanced.api.configuration.installCache
 import app.revanced.api.configuration.installNotarizedRoute
-import app.revanced.api.configuration.schema.APIAssetPublicKeys
+import app.revanced.api.configuration.schema.ApiAssetPublicKeys
-import app.revanced.api.configuration.schema.APIPatchesAsset
+import app.revanced.api.configuration.schema.ApiPatchesAsset
-import app.revanced.api.configuration.schema.APIRelease
+import app.revanced.api.configuration.schema.ApiRelease
-import app.revanced.api.configuration.schema.APIReleaseVersion
+import app.revanced.api.configuration.schema.ApiReleaseVersion
 import app.revanced.api.configuration.services.PatchesService
 import io.bkbn.kompendium.core.metadata.GetInfo
 import io.ktor.http.*
@@ -78,7 +78,7 @@ private fun Route.installPatchesRouteDocumentation(deprecated: Boolean) = instal
             description("The current patches release")
             mediaTypes("application/json")
             responseCode(HttpStatusCode.OK)
-            responseType<APIRelease<APIPatchesAsset>>()
+            responseType<ApiRelease<ApiPatchesAsset>>()
         }
     }
 }
@@ -94,7 +94,7 @@ private fun Route.installPatchesVersionRouteDocumentation(deprecated: Boolean) =
             description("The current patches release version")
             mediaTypes("application/json")
             responseCode(HttpStatusCode.OK)
-            responseType<APIReleaseVersion>()
+            responseType<ApiReleaseVersion>()
         }
     }
 }
@@ -126,7 +126,7 @@ private fun Route.installPatchesPublicKeyRouteDocumentation(deprecated: Boolean)
             description("The public keys")
             mediaTypes("application/json")
             responseCode(HttpStatusCode.OK)
-            responseType<APIAssetPublicKeys>()
+            responseType<ApiAssetPublicKeys>()
         }
     }
 }

src/main/kotlin/app/revanced/api/configuration/schema/APISchema.kt

@@ -3,44 +3,44 @@ package app.revanced.api.configuration.schema
 import kotlinx.datetime.LocalDateTime
 import kotlinx.serialization.Serializable
 
-interface APIUser {
+interface ApiUser {
     val name: String
     val avatarUrl: String
     val url: String
 }
 
 @Serializable
-class APIMember(
+class ApiMember(
     override val name: String,
     override val avatarUrl: String,
     override val url: String,
     val bio: String?,
-    val gpgKey: APIGpgKey?,
+    val gpgKey: ApiGpgKey?,
-) : APIUser
+) : ApiUser
 
 @Serializable
-class APIGpgKey(
+class ApiGpgKey(
     val id: String,
     val url: String,
 )
 
 @Serializable
-class APIContributor(
+class ApiContributor(
     override val name: String,
     override val avatarUrl: String,
     override val url: String,
     val contributions: Int,
-) : APIUser
+) : ApiUser
 
 @Serializable
 class APIContributable(
     val name: String,
     // Using a list instead of a set because set semantics are unnecessary here.
-    val contributors: List<APIContributor>,
+    val contributors: List<ApiContributor>,
 )
 
 @Serializable
-class APIRelease<T>(
+class ApiRelease<T>(
     val version: String,
     val createdAt: LocalDateTime,
     val description: String,
@@ -49,74 +49,82 @@ class APIRelease<T>(
 )
 
 @Serializable
-class APIManagerAsset(
+class ApiManagerAsset(
     val downloadUrl: String,
 )
 
 @Serializable
-class APIPatchesAsset(
+class ApiPatchesAsset(
     val downloadUrl: String,
     val signatureDownloadUrl: String,
     // TODO: Remove this eventually when integrations are merged into patches.
-    val name: APIAssetName,
+    val name: ApiAssetName,
 )
 
 @Serializable
-enum class APIAssetName {
+enum class ApiAssetName {
     PATCHES,
     INTEGRATION,
 }
 
 @Serializable
-class APIReleaseVersion(
+class ApiReleaseVersion(
     val version: String,
 )
 
 @Serializable
-class APIAnnouncement(
+class ApiAnnouncement(
     val author: String? = null,
     val title: String,
     val content: String? = null,
     // Using a list instead of a set because set semantics are unnecessary here.
-    val attachmentUrls: List<String> = emptyList(),
+    val attachments: List<String> = emptyList(),
-    val channel: String? = null,
+    // Using a list instead of a set because set semantics are unnecessary here.
+    val tags: List<String> = emptyList(),
     val archivedAt: LocalDateTime? = null,
     val level: Int = 0,
 )
 
 @Serializable
-class APIResponseAnnouncement(
+class ApiResponseAnnouncement(
     val id: Int,
     val author: String? = null,
     val title: String,
     val content: String? = null,
     // Using a list instead of a set because set semantics are unnecessary here.
-    val attachmentUrls: List<String> = emptyList(),
+    val attachments: List<String> = emptyList(),
-    val channel: String? = null,
+    // Using a list instead of a set because set semantics are unnecessary here.
+    val tags: List<Int> = emptyList(),
     val createdAt: LocalDateTime,
     val archivedAt: LocalDateTime? = null,
     val level: Int = 0,
 )
 
 @Serializable
-class APIResponseAnnouncementId(
+class ApiResponseAnnouncementId(
     val id: Int,
 )
 
 @Serializable
-class APIAnnouncementArchivedAt(
+class ApiAnnouncementArchivedAt(
     val archivedAt: LocalDateTime,
 )
 
 @Serializable
-class APIRateLimit(
+class ApiAnnouncementTag(
+    val id: Int,
+    val name: String,
+)
+
+@Serializable
+class ApiRateLimit(
     val limit: Int,
     val remaining: Int,
     val reset: LocalDateTime,
 )
 
 @Serializable
-class APIAssetPublicKeys(
+class ApiAssetPublicKeys(
     val patchesPublicKey: String,
     val integrationsPublicKey: String,
 )
@@ -174,4 +182,4 @@ class APIAbout(
 }
 
 @Serializable
-class APIToken(val token: String)
+class ApiToken(val token: String)

src/main/kotlin/app/revanced/api/configuration/services/AnnouncementService.kt

@@ -1,35 +1,29 @@
 package app.revanced.api.configuration.services
 
 import app.revanced.api.configuration.repository.AnnouncementRepository
-import app.revanced.api.configuration.schema.APIAnnouncement
+import app.revanced.api.configuration.schema.ApiAnnouncement
-import app.revanced.api.configuration.schema.APIResponseAnnouncementId
-import kotlinx.datetime.LocalDateTime
 
 internal class AnnouncementService(
     private val announcementRepository: AnnouncementRepository,
 ) {
-    fun latestId(channel: String): APIResponseAnnouncementId? = announcementRepository.latestId(channel)
+    suspend fun latest(tags: Set<Int>) = announcementRepository.latest(tags)
-    fun latestId(): APIResponseAnnouncementId? = announcementRepository.latestId()
 
-    fun latest(channel: String) = announcementRepository.latest(channel)
+    suspend fun latest() = announcementRepository.latest()
-    fun latest() = announcementRepository.latest()
 
-    suspend fun all(channel: String) = announcementRepository.all(channel)
+    fun latestId(tags: Set<Int>) = announcementRepository.latestId(tags)
-    suspend fun all() = announcementRepository.all()
 
-    suspend fun new(new: APIAnnouncement) {
+    fun latestId() = announcementRepository.latestId()
-        announcementRepository.new(new)
+
-    }
+    suspend fun paged(cursor: Int, limit: Int, tags: Set<Int>?, archived: Boolean) =
-    suspend fun archive(id: Int, archivedAt: LocalDateTime?) {
+        announcementRepository.paged(cursor, limit, tags, archived)
-        announcementRepository.archive(id, archivedAt)
+
-    }
+    suspend fun get(id: Int) = announcementRepository.get(id)
-    suspend fun unarchive(id: Int) {
+
-        announcementRepository.unarchive(id)
+    suspend fun update(id: Int, new: ApiAnnouncement) = announcementRepository.update(id, new)
-    }
+
-    suspend fun update(id: Int, new: APIAnnouncement) {
+    suspend fun delete(id: Int) = announcementRepository.delete(id)
-        announcementRepository.update(id, new)
+
-    }
+    suspend fun new(new: ApiAnnouncement) = announcementRepository.new(new)
-    suspend fun delete(id: Int) {
+
-        announcementRepository.delete(id)
+    suspend fun tags() = announcementRepository.tags()
-    }
 }

src/main/kotlin/app/revanced/api/configuration/services/ApiService.kt

@@ -21,7 +21,7 @@ internal class ApiService(
                 APIContributable(
                     it,
                     backendRepository.contributors(configurationRepository.organization, it).map {
-                        APIContributor(it.name, it.avatarUrl, it.url, it.contributions)
+                        ApiContributor(it.name, it.avatarUrl, it.url, it.contributions)
                     },
                 )
             }
@@ -29,13 +29,13 @@ internal class ApiService(
     }.awaitAll()
 
     suspend fun team() = backendRepository.members(configurationRepository.organization).map { member ->
-        APIMember(
+        ApiMember(
             member.name,
             member.avatarUrl,
             member.url,
             member.bio,
             if (member.gpgKeys.ids.isNotEmpty()) {
-                APIGpgKey(
+                ApiGpgKey(
                     // Must choose one of the GPG keys, because it does not make sense to have multiple GPG keys for the API.
                     member.gpgKeys.ids.first(),
                     member.gpgKeys.url,
@@ -47,6 +47,6 @@ internal class ApiService(
     }
 
     suspend fun rateLimit() = backendRepository.rateLimit()?.let {
-        APIRateLimit(it.limit, it.remaining, it.reset)
+        ApiRateLimit(it.limit, it.remaining, it.reset)
     }
 }

src/main/kotlin/app/revanced/api/configuration/services/AuthenticationService.kt

@@ -1,6 +1,6 @@
 package app.revanced.api.configuration.services
 
-import app.revanced.api.configuration.schema.APIToken
+import app.revanced.api.configuration.schema.ApiToken
 import com.auth0.jwt.JWT
 import com.auth0.jwt.algorithms.Algorithm
 import io.ktor.server.auth.*
@@ -43,7 +43,7 @@ internal class AuthenticationService private constructor(
         }
     }
 
-    fun newToken() = APIToken(
+    fun newToken() = ApiToken(
         JWT.create()
             .withIssuer(issuer)
             .withExpiresAt(Instant.now().plus(validityInMin, ChronoUnit.MINUTES))

src/main/kotlin/app/revanced/api/configuration/services/ManagerService.kt

@@ -9,17 +9,17 @@ internal class ManagerService(
     private val backendRepository: BackendRepository,
     private val configurationRepository: ConfigurationRepository,
 ) {
-    suspend fun latestRelease(): APIRelease<APIManagerAsset> {
+    suspend fun latestRelease(): ApiRelease<ApiManagerAsset> {
         val managerRelease = backendRepository.release(
             configurationRepository.organization,
             configurationRepository.manager.repository,
         )
 
-        val managerAsset = APIManagerAsset(
+        val managerAsset = ApiManagerAsset(
             managerRelease.assets.first(configurationRepository.manager.assetRegex).downloadUrl,
         )
 
-        return APIRelease(
+        return ApiRelease(
             managerRelease.tag,
             managerRelease.createdAt,
             managerRelease.releaseNote,
@@ -27,12 +27,12 @@ internal class ManagerService(
         )
     }
 
-    suspend fun latestVersion(): APIReleaseVersion {
+    suspend fun latestVersion(): ApiReleaseVersion {
         val managerRelease = backendRepository.release(
             configurationRepository.organization,
             configurationRepository.manager.repository,
         )
 
-        return APIReleaseVersion(managerRelease.tag)
+        return ApiReleaseVersion(managerRelease.tag)
     }
 }

src/main/kotlin/app/revanced/api/configuration/services/PatchesService.kt

@@ -17,7 +17,7 @@ internal class PatchesService(
     private val backendRepository: BackendRepository,
     private val configurationRepository: ConfigurationRepository,
 ) {
-    suspend fun latestRelease(): APIRelease<APIPatchesAsset> {
+    suspend fun latestRelease(): ApiRelease<ApiPatchesAsset> {
         val patchesRelease = backendRepository.release(
             configurationRepository.organization,
             configurationRepository.patches.repository,
@@ -30,8 +30,8 @@ internal class PatchesService(
 
         fun ConfigurationRepository.SignedAssetConfiguration.asset(
             release: BackendRepository.BackendOrganization.BackendRepository.BackendRelease,
-            assetName: APIAssetName,
+            assetName: ApiAssetName,
-        ) = APIPatchesAsset(
+        ) = ApiPatchesAsset(
             release.assets.first(assetRegex).downloadUrl,
             release.assets.first(signatureAssetRegex).downloadUrl,
             assetName,
@@ -39,14 +39,14 @@ internal class PatchesService(
 
         val patchesAsset = configurationRepository.patches.asset(
             patchesRelease,
-            APIAssetName.PATCHES,
+            ApiAssetName.PATCHES,
         )
         val integrationsAsset = configurationRepository.integrations.asset(
             integrationsRelease,
-            APIAssetName.INTEGRATION,
+            ApiAssetName.INTEGRATION,
         )
 
-        return APIRelease(
+        return ApiRelease(
             patchesRelease.tag,
             patchesRelease.createdAt,
             patchesRelease.releaseNote,
@@ -54,13 +54,13 @@ internal class PatchesService(
         )
     }
 
-    suspend fun latestVersion(): APIReleaseVersion {
+    suspend fun latestVersion(): ApiReleaseVersion {
         val patchesRelease = backendRepository.release(
             configurationRepository.organization,
             configurationRepository.patches.repository,
         )
 
-        return APIReleaseVersion(patchesRelease.tag)
+        return ApiReleaseVersion(patchesRelease.tag)
     }
 
     private val patchesListCache = Caffeine
@@ -111,12 +111,12 @@ internal class PatchesService(
         }
     }
 
-    fun publicKeys(): APIAssetPublicKeys {
+    fun publicKeys(): ApiAssetPublicKeys {
         fun readPublicKey(
             getSignedAssetConfiguration: ConfigurationRepository.() -> ConfigurationRepository.SignedAssetConfiguration,
         ) = configurationRepository.getSignedAssetConfiguration().publicKeyFile.readText()
 
-        return APIAssetPublicKeys(
+        return ApiAssetPublicKeys(
             readPublicKey { patches },
             readPublicKey { integrations },
         )

src/test/kotlin/app/revanced/api/configuration/services/AnnouncementServiceTest.kt

@@ -0,0 +1,194 @@
+package app.revanced.api.configuration.services
+
+import app.revanced.api.configuration.repository.AnnouncementRepository
+import app.revanced.api.configuration.schema.ApiAnnouncement
+import kotlinx.coroutines.runBlocking
+import kotlinx.datetime.toKotlinLocalDateTime
+import org.jetbrains.exposed.sql.Database
+import org.jetbrains.exposed.sql.transactions.TransactionManager
+import org.junit.jupiter.api.*
+import org.junit.jupiter.api.Assertions.assertNull
+import java.time.LocalDateTime
+import kotlin.test.assertEquals
+import kotlin.test.assertNotNull
+
+private object AnnouncementServiceTest {
+    private lateinit var announcementService: AnnouncementService
+
+    @JvmStatic
+    @BeforeAll
+    fun setUp() {
+        TransactionManager.defaultDatabase =
+            Database.connect("jdbc:h2:mem:test;DB_CLOSE_DELAY=-1;DATABASE_TO_UPPER=false")
+
+        announcementService = AnnouncementService(AnnouncementRepository())
+    }
+
+    @BeforeEach
+    fun clear() {
+        runBlocking {
+            while (true) {
+                val latestId = announcementService.latestId() ?: break
+                announcementService.delete(latestId.id)
+            }
+        }
+    }
+
+    @Test
+    fun `can do basic crud`(): Unit = runBlocking {
+        announcementService.new(ApiAnnouncement(title = "title"))
+
+        val latestId = announcementService.latestId()!!.id
+
+        announcementService.update(latestId, ApiAnnouncement(title = "new title"))
+        assert(announcementService.get(latestId)?.title == "new title")
+
+        announcementService.delete(latestId)
+        assertNull(announcementService.get(latestId))
+        assertNull(announcementService.latestId())
+    }
+
+    @Test
+    fun `archiving works properly`() = runBlocking {
+        announcementService.new(ApiAnnouncement(title = "title"))
+
+        val latest = announcementService.latest()!!
+        assertNull(announcementService.get(latest.id)?.archivedAt)
+
+        val updated = ApiAnnouncement(
+            title = latest.title,
+            archivedAt = LocalDateTime.now().toKotlinLocalDateTime(),
+        )
+
+        announcementService.update(latest.id, updated)
+        assertNotNull(announcementService.get(latest.id)?.archivedAt)
+
+        return@runBlocking
+    }
+
+    @Test
+    fun `latest works properly`() = runBlocking {
+        announcementService.new(ApiAnnouncement(title = "title"))
+        announcementService.new(ApiAnnouncement(title = "title2"))
+
+        var latest = announcementService.latest()
+        assert(latest?.title == "title2")
+
+        announcementService.delete(latest!!.id)
+
+        latest = announcementService.latest()
+        assert(latest?.title == "title")
+
+        announcementService.delete(latest!!.id)
+        assertNull(announcementService.latest())
+
+        announcementService.new(ApiAnnouncement(title = "1", tags = listOf("tag1", "tag2")))
+        announcementService.new(ApiAnnouncement(title = "2", tags = listOf("tag1", "tag3")))
+        announcementService.new(ApiAnnouncement(title = "3", tags = listOf("tag1", "tag4")))
+
+        val tag2 = announcementService.tags().find { it.name == "tag2" }!!.id
+        assert(announcementService.latest(setOf(tag2)).first().title == "1")
+
+        val tag3 = announcementService.tags().find { it.name == "tag3" }!!.id
+        assert(announcementService.latest(setOf(tag3)).last().title == "2")
+
+        val tag1and3 =
+            announcementService.tags().filter { it.name == "tag1" || it.name == "tag3" }.map { it.id }.toSet()
+        val announcement2and3 = announcementService.latest(tag1and3)
+        assert(announcement2and3.size == 2)
+        assert(announcement2and3.any { it.title == "2" })
+        assert(announcement2and3.any { it.title == "3" })
+
+        announcementService.delete(announcementService.latestId()!!.id)
+        assert(announcementService.latest(tag1and3).first().title == "2")
+
+        announcementService.delete(announcementService.latestId()!!.id)
+        assert(announcementService.latest(tag1and3).first().title == "1")
+
+        announcementService.delete(announcementService.latestId()!!.id)
+        assert(announcementService.latest(tag1and3).isEmpty())
+        assert(announcementService.tags().isEmpty())
+    }
+
+    @Test
+    fun `tags work properly`() = runBlocking {
+        announcementService.new(ApiAnnouncement(title = "title", tags = listOf("tag1", "tag2")))
+        announcementService.new(ApiAnnouncement(title = "title2", tags = listOf("tag1", "tag3")))
+
+        val tags = announcementService.tags()
+        assertEquals(3, tags.size)
+        assert(tags.any { it.name == "tag1" })
+        assert(tags.any { it.name == "tag2" })
+        assert(tags.any { it.name == "tag3" })
+
+        announcementService.delete(announcementService.latestId()!!.id)
+        assertEquals(2, announcementService.tags().size)
+
+        announcementService.update(
+            announcementService.latestId()!!.id,
+            ApiAnnouncement(title = "title", tags = listOf("tag1", "tag3")),
+        )
+
+        assertEquals(2, announcementService.tags().size)
+        assert(announcementService.tags().any { it.name == "tag3" })
+    }
+
+    @Test
+    fun `attachments work properly`() = runBlocking {
+        announcementService.new(ApiAnnouncement(title = "title", attachments = listOf("attachment1", "attachment2")))
+
+        val latestAnnouncement = announcementService.latest()!!
+        val latestId = latestAnnouncement.id
+
+        val attachments = latestAnnouncement.attachments
+        assertEquals(2, attachments.size)
+        assert(attachments.any { it == "attachment1" })
+        assert(attachments.any { it == "attachment2" })
+
+        announcementService.update(
+            latestId,
+            ApiAnnouncement(title = "title", attachments = listOf("attachment1", "attachment3")),
+        )
+        assert(announcementService.get(latestId)!!.attachments.any { it == "attachment3" })
+    }
+
+    @Test
+    fun `paging works correctly`() = runBlocking {
+        repeat(10) {
+            announcementService.new(ApiAnnouncement(title = "title$it"))
+        }
+
+        val announcements = announcementService.paged(Int.MAX_VALUE, 5, null, true)
+        assertEquals(5, announcements.size, "Returns correct number of announcements")
+        assertEquals("title9", announcements.first().title, "Starts from the latest announcement")
+
+        val announcements2 = announcementService.paged(5, 5, null, true)
+        assertEquals(5, announcements2.size, "Returns correct number of announcements when starting from the cursor")
+        assertEquals("title4", announcements2.first().title, "Starts from the cursor")
+
+        (0..4).forEach { id ->
+            announcementService.update(
+                id,
+                ApiAnnouncement(
+                    title = "title$id",
+                    tags = (0..id).map { "tag$it" },
+                    archivedAt = if (id % 2 == 0) {
+                        // Only two announcements will be archived.
+                        LocalDateTime.now().plusDays(2).minusDays(id.toLong()).toKotlinLocalDateTime()
+                    } else {
+                        null
+                    },
+                ),
+            )
+        }
+
+        val tags = announcementService.tags()
+        assertEquals(5, tags.size, "Returns correct number of newly created tags")
+
+        val announcements3 = announcementService.paged(5, 5, setOf(tags[1].id), true)
+        assertEquals(4, announcements3.size, "Filters announcements by tag")
+
+        val announcements4 = announcementService.paged(Int.MAX_VALUE, 10, null, false)
+        assertEquals(8, announcements4.size, "Filters out archived announcements")
+    }
+}