Add mutation to clear the cached images (#775)

server/src/main/kotlin/suwayomi/tachidesk/graphql/mutations/ImageMutation.kt

@@ -0,0 +1,57 @@
+package suwayomi.tachidesk.graphql.mutations
+
+import org.kodein.di.DI
+import org.kodein.di.conf.global
+import org.kodein.di.instance
+import suwayomi.tachidesk.manga.impl.util.storage.ImageResponse
+import suwayomi.tachidesk.server.ApplicationDirs
+
+private val applicationDirs by DI.global.instance<ApplicationDirs>()
+
+class ImageMutation {
+    data class ClearCachedImagesInput(
+        val clientMutationId: String? = null,
+        val downloadedThumbnails: Boolean? = null,
+        val cachedThumbnails: Boolean? = null,
+        val cachedPages: Boolean? = null,
+    )
+
+    data class ClearCachedImagesPayload(
+        val clientMutationId: String? = null,
+        val downloadedThumbnails: Boolean?,
+        val cachedThumbnails: Boolean?,
+        val cachedPages: Boolean?,
+    )
+
+    fun clearCachedImages(input: ClearCachedImagesInput): ClearCachedImagesPayload {
+        val (clientMutationId, downloadedThumbnails, cachedThumbnails, cachedPages) = input
+
+        val downloadedThumbnailsResult =
+            if (downloadedThumbnails == true) {
+                ImageResponse.clearImages(applicationDirs.thumbnailDownloadsRoot)
+            } else {
+                null
+            }
+
+        val cachedThumbnailsResult =
+            if (cachedThumbnails == true) {
+                ImageResponse.clearImages(applicationDirs.tempThumbnailCacheRoot)
+            } else {
+                null
+            }
+
+        val cachedPagesResult =
+            if (cachedPages == true) {
+                ImageResponse.clearImages(applicationDirs.tempMangaCacheRoot)
+            } else {
+                null
+            }
+
+        return ClearCachedImagesPayload(
+            clientMutationId,
+            downloadedThumbnails = downloadedThumbnailsResult,
+            cachedThumbnails = cachedThumbnailsResult,
+            cachedPages = cachedPagesResult,
+        )
+    }
+}

server/src/main/kotlin/suwayomi/tachidesk/graphql/server/TachideskGraphQLSchema.kt

@@ -18,6 +18,7 @@ import suwayomi.tachidesk.graphql.mutations.CategoryMutation
 import suwayomi.tachidesk.graphql.mutations.ChapterMutation
 import suwayomi.tachidesk.graphql.mutations.DownloadMutation
 import suwayomi.tachidesk.graphql.mutations.ExtensionMutation
+import suwayomi.tachidesk.graphql.mutations.ImageMutation
 import suwayomi.tachidesk.graphql.mutations.InfoMutation
 import suwayomi.tachidesk.graphql.mutations.MangaMutation
 import suwayomi.tachidesk.graphql.mutations.MetaMutation
@@ -84,6 +85,7 @@ val schema =
                 TopLevelObject(ChapterMutation()),
                 TopLevelObject(DownloadMutation()),
                 TopLevelObject(ExtensionMutation()),
+                TopLevelObject(ImageMutation()),
                 TopLevelObject(InfoMutation()),
                 TopLevelObject(MangaMutation()),
                 TopLevelObject(MetaMutation()),

server/src/main/kotlin/suwayomi/tachidesk/manga/impl/util/storage/ImageResponse.kt

@@ -114,4 +114,8 @@ object ImageResponse {
             File(it).delete()
         }
     }
+
+    fun clearImages(saveDir: String): Boolean {
+        return File(saveDir).deleteRecursively()
+    }
 }