Add batch endpoint for removing downloads from download queue (#452)

server/src/main/kotlin/suwayomi/tachidesk/manga/MangaAPI.kt

@@ -122,6 +122,7 @@ object MangaAPI {
             delete("{mangaId}/chapter/{chapterIndex}", DownloadController.unqueueChapter)
             patch("{mangaId}/chapter/{chapterIndex}/reorder/{to}", DownloadController.reorderChapter)
             post("batch", DownloadController.queueChapters)
+            delete("batch", DownloadController.unqueueChapters)
         }
 
         path("update") {

server/src/main/kotlin/suwayomi/tachidesk/manga/controller/DownloadController.kt

@@ -134,6 +134,28 @@ object DownloadController {
         }
     )
 
+    /** delete multiple chapters from download queue */
+    val unqueueChapters = handler(
+        documentWith = {
+            withOperation {
+                summary("Downloader remove multiple downloads")
+                description("Remove multiple chapters downloads from queue")
+            }
+            body<EnqueueInput>()
+        },
+        behaviorOf = { ctx ->
+            val input = json.decodeFromString<EnqueueInput>(ctx.body())
+            ctx.future(
+                future {
+                    DownloadManager.unqueue(input)
+                }
+            )
+        },
+        withResults = {
+            httpCode(HttpCode.OK)
+        }
+    )
+
     /** delete chapter from download queue */
     val unqueueChapter = handler(
         pathParam<Int>("chapterIndex"),

server/src/main/kotlin/suwayomi/tachidesk/manga/impl/download/DownloadManager.kt

@@ -190,6 +190,14 @@ object DownloadManager {
         addMultipleToQueue(inputPairs)
     }
 
+    fun unqueue(input: EnqueueInput) {
+        if (input.chapterIds.isNullOrEmpty()) return
+
+        downloadQueue.removeIf { it.chapter.id in input.chapterIds }
+
+        notifyAllClients()
+    }
+
     /**
      * Tries to add multiple inputs to queue
      * If any of inputs was actually added to queue, starts the queue