Build paths instead of manually creating the path

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

@@ -13,6 +13,7 @@ import suwayomi.tachidesk.manga.impl.download.fileProvider.ChaptersFilesProvider
 import suwayomi.tachidesk.manga.impl.download.model.DownloadChapter
 import suwayomi.tachidesk.manga.impl.util.getChapterDownloadPath
 import suwayomi.tachidesk.manga.impl.util.storage.ImageResponse
+import suwayomi.tachidesk.manga.impl.util.storage.SafePath.joinPaths
 import java.io.File
 import java.io.FileInputStream
 import java.io.InputStream
@@ -60,7 +61,7 @@ class FolderProvider(mangaId: Int, chapterId: Int) : ChaptersFilesProvider(manga
                         }
                         .launchIn(scope)
                 }.first.use { image ->
-                    val filePath = "$chapterDir/$fileName"
+                    val filePath = joinPaths(chapterDir, fileName)
                     ImageResponse.saveImage(filePath, image)
                 }
             } finally {

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

@@ -15,6 +15,7 @@ import org.kodein.di.conf.global
 import org.kodein.di.instance
 import suwayomi.tachidesk.manga.impl.util.source.GetCatalogueSource
 import suwayomi.tachidesk.manga.impl.util.storage.SafePath
+import suwayomi.tachidesk.manga.impl.util.storage.SafePath.joinPaths
 import suwayomi.tachidesk.manga.model.table.ChapterTable
 import suwayomi.tachidesk.manga.model.table.MangaTable
 import suwayomi.tachidesk.server.ApplicationDirs
@@ -28,7 +29,7 @@ private fun getMangaDir(mangaId: Int): String {
 
     val sourceDir = SafePath.buildValidFilename(source.toString())
     val mangaDir = SafePath.buildValidFilename(mangaEntry[MangaTable.title])
-    return "$sourceDir/$mangaDir"
+    return joinPaths(sourceDir, mangaDir)
 }
 
 private fun getChapterDir(mangaId: Int, chapterId: Int): String {
@@ -41,23 +42,23 @@ private fun getChapterDir(mangaId: Int, chapterId: Int): String {
         }
     )
 
-    return getMangaDir(mangaId) + "/$chapterDir"
+    return joinPaths(getMangaDir(mangaId), chapterDir)
 }
 
 fun getThumbnailDownloadPath(mangaId: Int): String {
-    return applicationDirs.thumbnailDownloadsRoot + "/$mangaId"
+    return joinPaths(applicationDirs.thumbnailDownloadsRoot, mangaId.toString())
 }
 
 fun getChapterDownloadPath(mangaId: Int, chapterId: Int): String {
-    return applicationDirs.mangaDownloadsRoot + "/" + getChapterDir(mangaId, chapterId)
+    return joinPaths(applicationDirs.mangaDownloadsRoot, getChapterDir(mangaId, chapterId))
 }
 
 fun getChapterCbzPath(mangaId: Int, chapterId: Int): String {
     return getChapterDownloadPath(mangaId, chapterId) + ".cbz"
 }
 
 fun getChapterCachePath(mangaId: Int, chapterId: Int): String {
-    return applicationDirs.tempMangaCacheRoot + "/" + getChapterDir(mangaId, chapterId)
+    return joinPaths(applicationDirs.tempMangaCacheRoot, getChapterDir(mangaId, chapterId))
 }
 
 /** return value says if rename/move was successful */
@@ -70,8 +71,8 @@ fun updateMangaDownloadDir(mangaId: Int, newTitle: String): Boolean {
 
     val newMangaDir = SafePath.buildValidFilename(newTitle)
 
-    val oldDir = "${applicationDirs.downloadsRoot}/$sourceDir/$mangaDir"
-    val newDir = "${applicationDirs.downloadsRoot}/$sourceDir/$newMangaDir"
+    val oldDir = joinPaths(applicationDirs.downloadsRoot, sourceDir, mangaDir)
+    val newDir = joinPaths(applicationDirs.downloadsRoot, sourceDir, newMangaDir)
 
     val oldDirFile = File(oldDir)
     val newDirFile = File(newDir)

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

@@ -1,5 +1,7 @@
 package suwayomi.tachidesk.manga.impl.util.storage
 
+import java.io.File
+
 /*
  * Copyright (C) Contributors to the Suwayomi project
  *
@@ -9,6 +11,10 @@ package suwayomi.tachidesk.manga.impl.util.storage
 
 // adopted from: https://github.com/tachiyomiorg/tachiyomi/blob/4cefbce7c34e724b409b6ba127f3c6c5c346ad8d/app/src/main/java/eu/kanade/tachiyomi/util/storage/DiskUtil.kt
 object SafePath {
+    fun joinPaths(vararg paths: String): String {
+        return paths.reduce { parent, child -> File(parent, child).toString() }
+    }
+
     /**
      * Mutate the given filename to make it valid for a FAT filesystem,
      * replacing any invalid characters with "_". This method doesn't allow hidden files (starting

server/src/main/kotlin/suwayomi/tachidesk/server/ServerSetup.kt

@@ -21,6 +21,7 @@ import org.kodein.di.singleton
 import suwayomi.tachidesk.manga.impl.update.IUpdater
 import suwayomi.tachidesk.manga.impl.update.Updater
 import suwayomi.tachidesk.manga.impl.util.lang.renameTo
+import suwayomi.tachidesk.manga.impl.util.storage.SafePath.joinPaths
 import suwayomi.tachidesk.server.database.databaseUp
 import suwayomi.tachidesk.server.util.AppMutex.handleAppMutex
 import suwayomi.tachidesk.server.util.SystemTray.systemTray
@@ -37,19 +38,18 @@ private val logger = KotlinLogging.logger {}
 
 class ApplicationDirs(
     val dataRoot: String = ApplicationRootDir,
-    val tempRoot: String = "${System.getProperty("java.io.tmpdir")}/Tachidesk"
+    tempRoot: String = joinPaths(System.getProperty("java.io.tmpdir"), "Tachidesk")
 ) {
-    val cacheRoot = System.getProperty("java.io.tmpdir") + "/tachidesk"
-    val extensionsRoot = "$dataRoot/extensions"
-    val downloadsRoot = serverConfig.downloadsPath.ifBlank { "$dataRoot/downloads" }
-    val localMangaRoot = "$dataRoot/local"
-    val webUIRoot = "$dataRoot/webUI"
+    val extensionsRoot = joinPaths(dataRoot, "extensions")
+    val downloadsRoot = serverConfig.downloadsPath.ifBlank { joinPaths(dataRoot, "downloads") }
+    val localMangaRoot = joinPaths(dataRoot, "local")
+    val webUIRoot = joinPaths(dataRoot, "webUI")
 
-    val tempThumbnailCacheRoot = "$tempRoot/thumbnails"
-    val tempMangaCacheRoot = "$tempRoot/manga-cache"
+    val tempThumbnailCacheRoot = joinPaths(tempRoot, "thumbnails")
+    val tempMangaCacheRoot = joinPaths(tempRoot, "manga-cache")
 
-    val thumbnailDownloadsRoot = "$downloadsRoot/thumbnails"
-    val mangaDownloadsRoot = "$downloadsRoot/mangas"
+    val thumbnailDownloadsRoot = joinPaths(downloadsRoot, "thumbnails")
+    val mangaDownloadsRoot = joinPaths(downloadsRoot, "mangas")
 }
 
 val serverConfig: ServerConfig by lazy { GlobalConfigManager.module() }

server/src/main/kotlin/suwayomi/tachidesk/server/util/WebInterfaceManager.kt

@@ -13,6 +13,7 @@ import net.lingala.zip4j.ZipFile
 import org.kodein.di.DI
 import org.kodein.di.conf.global
 import org.kodein.di.instance
+import suwayomi.tachidesk.manga.impl.util.storage.SafePath.joinPaths
 import suwayomi.tachidesk.server.ApplicationDirs
 import suwayomi.tachidesk.server.BuildConfig
 import suwayomi.tachidesk.server.serverConfig
@@ -62,7 +63,7 @@ fun setupWebInterface() {
 /** Make sure a valid copy of WebUI is available */
 fun setupWebUI() {
     // check if we have webUI installed and is correct version
-    val webUIRevisionFile = File(applicationDirs.webUIRoot + "/revision")
+    val webUIRevisionFile = File(applicationDirs.webUIRoot, "revision")
     if (webUIRevisionFile.exists() && webUIRevisionFile.readText().trim() == BuildConfig.WEBUI_TAG) {
         logger.info { "WebUI Static files exists and is the correct revision" }
         logger.info { "Verifying WebUI Static files..." }
@@ -71,7 +72,7 @@ fun setupWebUI() {
         File(applicationDirs.webUIRoot).deleteRecursively()
 
         val webUIZip = "Tachidesk-WebUI-${BuildConfig.WEBUI_TAG}.zip"
-        val webUIZipPath = "$tmpDir/$webUIZip"
+        val webUIZipPath = joinPaths(tmpDir, webUIZip)
         val webUIZipFile = File(webUIZipPath)
 
         // try with resources first