check app update api closes #72

server/src/main/kotlin/suwayomi/tachidesk/global/GlobalAPI.kt

@@ -2,6 +2,8 @@ package suwayomi.tachidesk.global
 
 import io.javalin.Javalin
 import suwayomi.tachidesk.global.impl.About
+import suwayomi.tachidesk.global.impl.AppUpdate
+import suwayomi.tachidesk.server.JavalinSetup
 
 /*
  * Copyright (C) Contributors to the Suwayomi project
@@ -17,9 +19,12 @@ object GlobalAPI {
             ctx.json(About.getAbout())
         }
 
-        // TODO: app update check api
+        // check for app updates
         app.get("/api/v1/settings/check-update/") { ctx ->
-            ctx.json(About.getAbout())
+
+            ctx.json(
+                JavalinSetup.future { AppUpdate.checkUpdate() }
+            )
         }
     }
 }

server/src/main/kotlin/suwayomi/tachidesk/global/impl/AppUpdate.kt

@@ -0,0 +1,57 @@
+package suwayomi.tachidesk.global.impl
+
+import eu.kanade.tachiyomi.network.GET
+import eu.kanade.tachiyomi.network.NetworkHelper
+import kotlinx.serialization.json.Json
+import kotlinx.serialization.json.jsonObject
+import kotlinx.serialization.json.jsonPrimitive
+import suwayomi.tachidesk.manga.impl.util.network.await
+import uy.kohesive.injekt.injectLazy
+
+/*
+ * Copyright (C) Contributors to the Suwayomi project
+ * 
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+data class UpdateDataClass(
+    val channel: String,
+    val tag: String,
+    val url: String
+)
+
+object AppUpdate {
+    const val LATEST_RELEASE_URL = "https://api.github.com/repos/Suwayomi/Tachidesk/releases/latest"
+    const val LATEST_PREVIEW_URL = "https://api.github.com/repos/Suwayomi/Tachidesk-preview/releases/latest"
+
+    private val json: Json by injectLazy()
+    private val network: NetworkHelper by injectLazy()
+
+    suspend fun checkUpdate(): List<UpdateDataClass> {
+        val releaseJson = json.parseToJsonElement(
+            network.client.newCall(
+                GET(LATEST_RELEASE_URL)
+            ).await().body!!.string()
+        ).jsonObject
+
+        val previewJson = json.parseToJsonElement(
+            network.client.newCall(
+                GET(LATEST_PREVIEW_URL)
+            ).await().body!!.string()
+        ).jsonObject
+
+        return listOf(
+            UpdateDataClass(
+                "Release",
+                releaseJson["tag_name"]!!.jsonPrimitive.content,
+                releaseJson["html_url"]!!.jsonPrimitive.content,
+            ),
+            UpdateDataClass(
+                "Preview",
+                previewJson["tag_name"]!!.jsonPrimitive.content,
+                previewJson["html_url"]!!.jsonPrimitive.content,
+            ),
+        )
+    }
+}