CustomSongs: Restore custom song list after reload

Uses the File System Access API supported in some browsers to keep the custom song list between sessions, restoring it back even when the page was closed.

public/src/js/abstractfile.js

@@ -4,6 +4,21 @@ function readFile(file, arrayBuffer, encoding){
 	reader[arrayBuffer ? "readAsArrayBuffer" : "readAsText"](file, encoding)
 	return promise
 }
+function filePermission(file){
+	return file.queryPermission().then(response => {
+		if(response === "granted"){
+			return file
+		}else{
+			return file.requestPermission().then(response => {
+				if(response === "granted"){
+					return file
+				}else{
+					return Promise.reject(file)
+				}
+			})
+		}
+	})
+}
 class RemoteFile{
 	constructor(url){
 		this.url = url
@@ -54,6 +69,23 @@ class LocalFile{
 		return Promise.resolve(this.file)
 	}
 }
+class FilesystemFile{
+	constructor(file, path){
+		this.file = file
+		this.path = path
+		this.url = this.path
+		this.name = file.name
+	}
+	arrayBuffer(){
+		return this.blob().then(blob => blob.arrayBuffer())
+	}
+	read(encoding){
+		return this.blob().then(blob => readFile(blob, false, encoding))
+	}
+	blob(){
+		return filePermission(this.file).then(file => file.getFile())
+	}
+}
 class GdriveFile{
 	constructor(fileObj){
 		this.path = fileObj.path

public/src/js/assets.js

@@ -35,7 +35,8 @@ var assets = {
 		"account.js",
 		"lyrics.js",
 		"customsongs.js",
-		"abstractfile.js"
+		"abstractfile.js",
+		"idb.js"
 	],
 	"css": [
 		"main.css",

public/src/js/customsongs.js

@@ -1,12 +1,23 @@
 class CustomSongs{
-	constructor(touchEnabled){
+	constructor(touchEnabled, noPage){
+		this.loaderDiv = document.createElement("div")
+		this.loaderDiv.innerHTML = assets.pages["loadsong"]
+		var loadingText = this.loaderDiv.querySelector("#loading-text")
+		this.setAltText(loadingText, strings.loading)
+		
+		this.locked = false
+		this.mode = "main"
+		
+		if(noPage){
+			this.noPage = true
+			return
+		}
+		
 		this.touchEnabled = touchEnabled
 		loader.changePage("customsongs", true)
 		if(touchEnabled){
 			this.getElement("view-outer").classList.add("touch-enabled")
 		}
-		this.locked = false
-		this.mode = "main"
 		
 		var tutorialTitle = this.getElement("view-title")
 		this.setAltText(tutorialTitle, strings.customSongs.title)
@@ -19,7 +30,7 @@ class CustomSongs{
 		
 		this.items = []
 		this.linkLocalFolder = document.getElementById("link-localfolder")
-		this.hasLocal = "webkitdirectory" in HTMLInputElement.prototype && !(/Android|iPhone|iPad/.test(navigator.userAgent))
+		this.hasLocal = (typeof showDirectoryPicker === "function" || "webkitdirectory" in HTMLInputElement.prototype) && !(/Android|iPhone|iPad/.test(navigator.userAgent))
 		this.selected = -1
 		
 		if(this.hasLocal){
@@ -68,12 +79,7 @@ class CustomSongs{
 			this.selected = this.items.length - 1
 		}
 		
-		this.loaderDiv = document.createElement("div")
-		this.loaderDiv.innerHTML = assets.pages["loadsong"]
-		var loadingText = this.loaderDiv.querySelector("#loading-text")
-		this.setAltText(loadingText, strings.loading)
-		
-		if(DataTransferItem.prototype.webkitGetAsEntry){
+		if(DataTransferItem.prototype.getAsFileSystemHandle || DataTransferItem.prototype.webkitGetAsEntry){
 			this.dropzone = document.getElementById("dropzone")
 			var dropContent = this.dropzone.getElementsByClassName("view-content")[0]
 			dropContent.innerText = strings.customSongs.dropzone
@@ -142,8 +148,20 @@ class CustomSongs{
 			return
 		}
 		this.changeSelected(this.linkLocalFolder)
+		if(typeof showDirectoryPicker === "function"){
+			return showDirectoryPicker().then(file => {
+				this.walkFilesystem(file).then(files => this.importLocal(files)).then(e => {
+					db.setItem("customFolder", file)
+				}).catch(e => {
+					if(e !== "cancel"){
+						return Promise.reject(e)
+					}
+				})
+			}, () => {})
+		}else{
 			this.browse.click()
 		}
+	}
 	browseChange(event){
 		var files = []
 		for(var i = 0; i < event.target.files.length; i++){
@@ -151,6 +169,24 @@ class CustomSongs{
 		}
 		this.importLocal(files)
 	}
+	walkFilesystem(dir, path=dir.name + "/", output=[]){
+		return filePermission(dir).then(dir => {
+			var values = dir.values()
+			var walkValues = () => values.next().then(generator => {
+				if(generator.done){
+					return output
+				}
+				var file = generator.value
+				if(file.kind === "directory"){
+					return this.walkFilesystem(file, path + file.name + "/", output).then(() => walkValues())
+				}else{
+					output.push(new FilesystemFile(file, path + file.name))
+					return walkValues()
+				}
+			})
+			return walkValues()
+		}, () => Promise.resolve())
+	}
 	filesDropped(event){
 		event.preventDefault()
 		this.dropzone.classList.remove("dragover")
@@ -158,12 +194,44 @@ class CustomSongs{
 		if(this.locked){
 			return
 		}
-		var files = []
-		var walk = (entry, path="") => {
+		var allFiles = []
+		var dropPromises = []
+		var dropLength = event.dataTransfer.items.length
+		for(var i = 0; i < dropLength; i++){
+			var item = event.dataTransfer.items[i]
+			let promise
+			if(item.getAsFileSystemHandle){
+				promise = item.getAsFileSystemHandle().then(file => {
+					if(file.kind === "directory"){
+						return this.walkFilesystem(file).then(files => {
+							if(files.length && dropLength === 1){
+								db.setItem("customFolder", file)
+							}
+							return files
+						})
+					}else{
+						return [new FilesystemFile(file, file.name)]
+					}
+				})
+			}else{
+				var entry = item.webkitGetAsEntry()
+				if(entry){
+					promise = this.walkEntry(entry)
+				}
+			}
+			if(promise){
+				dropPromises.push(promise.then(files => {
+					allFiles = allFiles.concat(files)
+				}))
+			}
+		}
+		Promise.all(dropPromises).then(() => this.importLocal(allFiles))
+	}
+	walkEntry(entry, path="", output=[]){
 		return new Promise(resolve => {
 			if(entry.isFile){
 				entry.file(file => {
-						files.push(new LocalFile(file, path + file.name))
+					output.push(new LocalFile(file, path + file.name))
 					return resolve()
 				}, resolve)
 			}else if(entry.isDirectory){
@@ -171,33 +239,24 @@ class CustomSongs{
 				dirReader.readEntries(entries => {
 					var dirPromises = []
 					for(var i = 0; i < entries.length; i++){
-							dirPromises.push(walk(entries[i], path + entry.name + "/"))
+						dirPromises.push(this.walkEntry(entries[i], path + entry.name + "/", output))
 					}
 					return Promise.all(dirPromises).then(resolve)
 				}, resolve)
 			}else{
 				return resolve()
 			}
-			})
-		}
-		var dropPromises = []
-		for(var i = 0; i < event.dataTransfer.items.length; i++){
-			var entry = event.dataTransfer.items[i].webkitGetAsEntry()
-			if(entry){
-				dropPromises.push(walk(entry))
-			}
-		}
-		Promise.all(dropPromises).then(() => this.importLocal(files))
+		}).then(() => output)
 	}
 	importLocal(files){
 		if(!files.length){
-			return
+			return Promise.resolve("cancel")
 		}
 		this.locked = true
 		this.loading(true)
 		
 		var importSongs = new ImportSongs()
-		importSongs.load(files).then(this.songsLoaded.bind(this), e => {
+		return importSongs.load(files).then(this.songsLoaded.bind(this), e => {
 			this.browse.parentNode.reset()
 			this.locked = false
 			this.loading(false)
@@ -315,7 +374,7 @@ class CustomSongs{
 			var length = songs.length
 			assets.songs = songs
 			assets.customSongs = true
-			assets.customSelected = 0
+			assets.customSelected = this.noPage ? +localStorage.getItem("customSelected") : 0
 		}
 		assets.sounds["se_don"].play()
 		this.clean()
@@ -393,15 +452,18 @@ class CustomSongs{
 			touched = this.touchEnabled
 		}
 		this.clean()
+		if(!this.noPage){
 			assets.sounds[confirm ? "se_don" : "se_cancel"].play()
-		setTimeout(() => {
+		}
+		return new Promise(resolve => setTimeout(() => {
 			new SongSelect("customSongs", false, touched)
-		}, 500)
+			resolve()
+		}, 500))
 	}
 	showError(text){
 		this.locked = false
 		this.loading(false)
-		if(this.mode === "error"){
+		if(this.noPage || this.mode === "error"){
 			return
 		}
 		this.mode = "error"
@@ -418,6 +480,10 @@ class CustomSongs{
 		assets.sounds[confirm ? "se_don" : "se_cancel"].play()
 	}
 	clean(){
+		delete this.loaderDiv
+		if(this.noPage){
+			return
+		}
 		this.keyboard.clean()
 		this.gamepad.clean()
 		pageEvents.remove(this.browse, "change")
@@ -443,7 +509,6 @@ class CustomSongs{
 		delete this.linkPrivacy
 		delete this.endButton
 		delete this.items
-		delete this.loaderDiv
 		delete this.errorDiv
 		delete this.errorContent
 		delete this.errorEnd

public/src/js/idb.js

@@ -0,0 +1,51 @@
+class IDB{
+	constructor(name, store){
+		this.name = name
+		this.store = store
+	}
+	init(){
+		if(this.db){
+			return Promise.resolve(this.db)
+		}
+		var request = indexedDB.open(this.name)
+		request.onupgradeneeded = event => {
+			var db = event.target.result
+			db.createObjectStore(this.store)
+		}
+		return this.promise(request).then(result => {
+			this.db = result
+			return this.db
+		}, target =>
+			console.warn("DB error", target)
+		)
+	}
+	promise(request){
+		return new Promise((resolve, reject) => {
+			return pageEvents.race(request, "success", "error").then(response => {
+				if(response.type === "success"){
+					return resolve(event.target.result)
+				}else{
+					return reject(event.target)
+				}
+			})
+		})
+	}
+	transaction(method, ...args){
+		return this.init().then(db =>
+			db.transaction(this.store, "readwrite").objectStore(this.store)[method](...args)
+		).then(this.promise.bind(this))
+	}
+	getItem(name){
+		return this.transaction("get", name)
+	}
+	setItem(name, value){
+		return this.transaction("put", value, name)
+	}
+	removeItem(name){
+		return this.transaction("delete", name)
+	}
+	removeDB(){
+		delete this.db
+		return indexedDB.deleteDatabase(this.name)
+	}
+}

public/src/js/loader.js

@@ -252,6 +252,7 @@ class Loader{
 			settings = new Settings()
 			pageEvents.setKbd()
 			scoreStorage = new ScoreStorage()
+			db = new IDB("taiko", "store")
 			
 			Promise.all(this.promises).then(() => {
 				if(this.error){

public/src/js/main.js

@@ -90,6 +90,7 @@ var settings
 var scoreStorage
 var account = {}
 var gpicker
+var db
 
 pageEvents.add(root, ["touchstart", "touchmove", "touchend"], event => {
 	if(event.cancelable && cancelTouch && event.target.tagName !== "SELECT"){

public/src/js/songselect.js

@@ -210,7 +210,7 @@ class SongSelect{
 		if(!assets.customSongs && !fromTutorial && !("selectedSong" in localStorage) && !songId){
 			fromTutorial = touchEnabled ? "about" : "tutorial"
 		}
-		if(p2.session){
+		if(p2.session || assets.customSongs && "customSelected" in localStorage){
 			fromTutorial = false
 		}
 		
@@ -231,7 +231,7 @@ class SongSelect{
 			if(songIdIndex !== -1){
 				this.selectedSong = songIdIndex
 			}else if(assets.customSongs){
-				this.selectedSong = assets.customSelected
+				this.selectedSong = Math.min(Math.max(0, assets.customSelected), this.songs.length - 1)
 			}else if((!p2.session || fadeIn) && "selectedSong" in localStorage){
 				this.selectedSong = Math.min(Math.max(0, localStorage["selectedSong"] |0), this.songs.length - 1)
 			}
@@ -508,7 +508,7 @@ class SongSelect{
 				moveTo = "account"
 			}else if(p2.session && 438 < mouse.x && mouse.x < 834 && mouse.y > 603){
 				moveTo = "session"
-			}else if(!p2.session && mouse.x > 641 && mouse.y > 603 && p2.socket.readyState === 1 && !assets.customSongs){
+			}else if(!p2.session && mouse.x > 641 && mouse.y > 603 && p2.socket && p2.socket.readyState === 1 && !assets.customSongs){
 				moveTo = "session"
 			}else{
 				var moveTo = this.songSelMouse(mouse.x, mouse.y)
@@ -739,6 +739,7 @@ class SongSelect{
 		try{
 			if(assets.customSongs){
 				assets.customSelected = this.selectedSong
+				localStorage["customSelected"] = this.selectedSong
 			}else{
 				localStorage["selectedSong"] = this.selectedSong
 			}
@@ -850,6 +851,8 @@ class SongSelect{
 			setTimeout(() => {
 				new SongSelect("customSongs", false, this.touchEnabled)
 			}, 500)
+			localStorage.removeItem("customSelected")
+			db.removeItem("customFolder")
 			pageEvents.send("import-songs-default")
 		}else{
 			localStorage["selectedSong"] = this.selectedSong
@@ -1174,6 +1177,7 @@ class SongSelect{
 				this.state.locked = 2
 				if(assets.customSongs){
 					assets.customSelected = this.selectedSong
+					localStorage["customSelected"] = this.selectedSong
 				}else if(!p2.session){
 					try{
 						localStorage["selectedSong"] = this.selectedSong
@@ -2097,7 +2101,7 @@ class SongSelect{
 		ctx.lineTo(x + 4, y + 4)
 		ctx.lineTo(x + 4, y + h)
 		ctx.fill()
-		if(screen !== "difficulty" && p2.socket.readyState === 1 && !assets.customSongs){
+		if(screen !== "difficulty" && p2.socket && p2.socket.readyState === 1 && !assets.customSongs){
 			var elapsed = (ms - this.state.screenMS) % 3100
 			var fade = 1
 			if(!p2.session && screen === "song"){

public/src/js/titlescreen.js

@@ -1,6 +1,7 @@
 class Titlescreen{
 	constructor(songId){
 		this.songId = songId
+		db.getItem("customFolder").then(folder => this.customFolder = folder)
 		
 		if(!songId){
 			loader.changePage("titlescreen", false)
@@ -50,7 +51,7 @@ class Titlescreen{
 	
 	onPressed(pressed, name){
 		if(pressed){
-			if(name === "gamepadConfirm" && snd.buffer.context.state === "suspended"){
+			if(name === "gamepadConfirm" && (snd.buffer.context.state === "suspended" || this.customFolder)){
 				return
 			}
 			this.titleScreen.style.cursor = "auto"
@@ -62,20 +63,30 @@ class Titlescreen{
 	goNext(fromP2){
 		if(p2.session && !fromP2){
 			p2.send("songsel")
-		}else if(fromP2 || localStorage.getItem("tutorial") === "true"){
+		}else{
+			if(fromP2 || this.customFolder || localStorage.getItem("tutorial") === "true"){
 				if(this.touched){
 					localStorage.setItem("tutorial", "true")
 				}
 				pageEvents.remove(p2, "message")
+				if(this.customFolder && !fromP2 && !assets.customSongs){
+					var customSongs = new CustomSongs(this.touched, true)
+					customSongs.walkFilesystem(this.customFolder).then(files => customSongs.importLocal(files)).catch(() => {
+						db.removeItem("customFolder")
+						new SongSelect(false, false, this.touched, this.songId)
+					})
+				}else{
 					setTimeout(() => {
 						new SongSelect(false, false, this.touched, this.songId)
 					}, 500)
+				}
 			}else{
 				setTimeout(() => {
 					new SettingsView(this.touched, true, this.songId)
 				}, 500)
 			}
 		}
+	}
 	setLang(lang, noEvent){
 		settings.setLang(lang, true)
 		if(this.songId){