ImportSongs: Add Google Drive support

- Adds a new page for importing custom songs, where it is possible to pick a local folder (desktop only) or a Google Drive folder (desktop and Android)
  - This feature is disabled on iOS due to the lack of OGG audio support in the browser
- In order to not get rate limited, a TJA file is parsed for metadata only when the song is clicked in the song selection, rather than all at once at import time
- The instance maintainer will need to provide the API credentials in the config.py file to enable this feature
  - This requires a new project to be created at console.cloud.google.com
  - Drive API will have to be enabled
  - API and OAuth keys should be created
    - API key can be restricted to only have Google Drive and Google Picker APIs
    - OAuth Client ID should have Web Application type and JavaScript origins set
    - Editing the OAuth consent screen to have a name and icon is recommended
      - It is semi-required to submit the consent screen for verification as the permission to download all of the Drive files will be asked.
      - Note that the email of the maintainer is publicly visible on the consent screen
  - The project number can be found in the IAM & Admin settings page

app.py

@@ -119,7 +119,8 @@ def get_config():
         'assets_baseurl': config.ASSETS_BASEURL,
         'email': config.EMAIL,
         'accounts': config.ACCOUNTS,
-        'custom_js': config.CUSTOM_JS
+        'custom_js': config.CUSTOM_JS,
+        'google_credentials': config.GOOGLE_CREDENTIALS
     }
 
     if not config_out.get('songs_baseurl'):

config.example.py

@@ -33,3 +33,11 @@ SECRET_KEY = 'change-me'
 
 # Git repository base URL.
 URL = 'https://github.com/bui/taiko-web/'
+
+# Google Drive API.
+GOOGLE_CREDENTIALS = {
+    'gdrive_enabled': False,
+    'api_key': '',
+    'oauth_client_id': '',
+    'project_number': ''
+}

public/src/css/loadsong.css

@@ -19,6 +19,7 @@
 	border-radius: 5px;
 	border: 3px solid white;
 	color: #fff;
+	z-index: 1;
 }
 #loading-don{
 	width: 10vw;

public/src/js/abstractfile.js

@@ -0,0 +1,87 @@
+class RemoteFile{
+	constructor(url){
+		this.url = url
+		try{
+			this.path = new URL(url).pathname
+		}catch(e){
+			this.path = url
+		}
+		if(this.path.startsWith("/")){
+			this.path = this.path.slice(1)
+		}
+		this.name = this.path
+		var index = this.name.lastIndexOf("/")
+		if(index !== -1){
+			this.name = this.name.slice(index + 1)
+		}
+	}
+	arrayBuffer(){
+		return loader.ajax(this.url, request => {
+			request.responseType = "arraybuffer"
+		})
+	}
+	read(encoding){
+		if(encoding){
+			return this.arrayBuffer().then(response =>
+				new TextDecoder(encoding).decode(response)
+			)
+		}else{
+			return loader.ajax(this.url)
+		}
+	}
+}
+class LocalFile{
+	constructor(file){
+		this.file = file
+		this.path = file.webkitRelativePath
+		this.url = this.path
+		this.name = file.name
+	}
+	arrayBuffer(){
+		var reader = new FileReader()
+		var promise = pageEvents.load(reader).then(event => event.target.result)
+		reader.readAsArrayBuffer(this.file)
+		return promise
+	}
+	read(encoding){
+		var reader = new FileReader()
+		var promise = pageEvents.load(reader).then(event => event.target.result)
+		reader.readAsText(this.file, encoding)
+		return promise
+	}
+}
+class GdriveFile{
+	constructor(fileObj){
+		this.path = fileObj.path
+		this.name = fileObj.name
+		this.id = fileObj.id
+		this.url = gpicker.filesUrl + this.id + "?alt=media"
+	}
+	arrayBuffer(){
+		return gpicker.downloadFile(this.id, true)
+	}
+	read(encoding){
+		if(encoding){
+			return this.arrayBuffer().then(response =>
+				new TextDecoder(encoding).decode(response)
+			)
+		}else{
+			return gpicker.downloadFile(this.id)
+		}
+	}
+}
+class CachedFile{
+	constructor(contents, oldFile){
+		this.contents = contents
+		this.oldFile = oldFile
+		this.path = oldFile.path
+		this.name = oldFile.name
+		this.url = oldFile.url
+	}
+	arrayBuffer(){
+		return Promise.resolve(this.contents)
+	}
+	read(encoding){
+		return this.arrayBuffer()
+	}
+}

public/src/js/assets.js

@@ -33,7 +33,9 @@ var assets = {
 		"settings.js",
 		"scorestorage.js",
 		"account.js",
-		"lyrics.js"
+		"lyrics.js",
+		"customsongs.js",
+		"abstractfile.js"
 	],
 	"css": [
 		"main.css",
@@ -144,7 +146,8 @@ var assets = {
 		"session.html",
 		"settings.html",
 		"account.html",
-		"login.html"
+		"login.html",
+		"customsongs.html"
 	],
 	
 	"songs": [],

public/src/js/controller.js

@@ -246,23 +246,15 @@ class Controller{
 					var songObj = assets.songs.find(song => song.id === this.selectedSong.folder)
 					var promises = []
 					if(songObj.chart && songObj.chart !== "blank"){
-						var reader = new FileReader()
-						promises.push(pageEvents.load(reader).then(event => {
-							this.songData = event.target.result.replace(/\0/g, "").split("\n")
+						promises.push(songObj.chart.read(this.selectedSong.type === "tja" ? "sjis" : undefined).then(data => {
+							this.songData = data.replace(/\0/g, "").split("\n")
 							return Promise.resolve()
 						}))
-						if(this.selectedSong.type === "tja"){
-							reader.readAsText(songObj.chart, "sjis")
-						}else{
-							reader.readAsText(songObj.chart)
-						}
 					}
 					if(songObj.lyricsFile){
-						var reader = new FileReader()
-						promises.push(pageEvents.load(reader).then(event => {
+						promises.push(songObj.lyricsFile.read().then(event => {
 							songObj.lyricsData = event.target.result
-						}, () => Promise.resolve()), songObj.lyricsFile.webkitRelativePath)
-						reader.readAsText(songObj.lyricsFile)
+						}, () => Promise.resolve()), songObj.lyricsFile.path)
 					}
 					Promise.all(promises).then(resolve)
 				}

public/src/js/customsongs.js

@@ -0,0 +1,216 @@
+class CustomSongs{
+	constructor(touchEnabled){
+		this.touchEnabled = touchEnabled
+		loader.changePage("customsongs", true)
+		if(touchEnabled){
+			this.getElement("view-outer").classList.add("touch-enabled")
+		}
+		this.locked = false
+		
+		var tutorialTitle = this.getElement("view-title")
+		this.setAltText(tutorialTitle, strings.customSongs.title)
+		
+		var tutorialContent = this.getElement("view-content")
+		strings.customSongs.description.forEach(string => {
+			tutorialContent.appendChild(document.createTextNode(string))
+			tutorialContent.appendChild(document.createElement("br"))
+		})
+		
+		this.items = []
+		this.linkLocalFolder = document.getElementById("link-localfolder")
+		this.hasLocal = "webkitdirectory" in HTMLInputElement.prototype && !(/Android/.test(navigator.userAgent))
+		if(this.hasLocal){
+			this.browse = document.getElementById("browse")
+			pageEvents.add(this.browse, "change", this.browseChange.bind(this))
+			this.setAltText(this.linkLocalFolder, strings.customSongs.localFolder)
+			pageEvents.add(this.linkLocalFolder, ["mousedown", "touchstart"], this.localFolder.bind(this))
+			this.items.push(this.linkLocalFolder)
+		}else{
+			this.linkLocalFolder.parentNode.removeChild(this.linkLocalFolder)
+		}
+		
+		this.linkGdriveFolder = document.getElementById("link-gdrivefolder")
+		if(gameConfig.google_credentials.gdrive_enabled){
+			this.setAltText(this.linkGdriveFolder, strings.customSongs.gdriveFolder)
+			pageEvents.add(this.linkGdriveFolder, ["mousedown", "touchstart"], this.gdriveFolder.bind(this))
+			this.items.push(this.linkGdriveFolder)
+		}else{
+			this.linkGdriveFolder.parentNode.removeChild(this.linkGdriveFolder)
+		}
+		
+		this.endButton = this.getElement("view-end-button")
+		this.setAltText(this.endButton, strings.session.cancel)
+		pageEvents.add(this.endButton, ["mousedown", "touchstart"], this.onEnd.bind(this))
+		this.items.push(this.endButton)
+		this.selected = this.items.length - 1
+		
+		this.loaderDiv = document.createElement("div")
+		this.loaderDiv.innerHTML = assets.pages["loadsong"]
+		var loadingText = this.loaderDiv.querySelector("#loading-text")
+		loadingText.appendChild(document.createTextNode(strings.loading))
+		loadingText.setAttribute("alt", strings.loading)
+		
+		this.keyboard = new Keyboard({
+			confirm: ["enter", "space", "don_l", "don_r"],
+			previous: ["left", "up", "ka_l"],
+			next: ["right", "down", "ka_r"],
+			back: ["escape"]
+		}, this.keyPressed.bind(this))
+		this.gamepad = new Gamepad({
+			confirmPad: ["b", "ls", "rs"],
+			previous: ["u", "l", "lb", "lt", "lsu", "lsl"],
+			next: ["d", "r", "rb", "rt", "lsd", "lsr"],
+			back: ["start", "a"]
+		}, this.keyPressed.bind(this))
+		
+		pageEvents.send("custom-songs")
+	}
+	getElement(name){
+		return loader.screen.getElementsByClassName(name)[0]
+	}
+	setAltText(element, text){
+		element.innerText = text
+		element.setAttribute("alt", text)
+	}
+	localFolder(){
+		if(this.locked){
+			return
+		}
+		this.browse.click()
+	}
+	browseChange(event){
+		var files = []
+		for(var i = 0; i < event.target.files.length; i++){
+			files.push(new LocalFile(event.target.files[i]))
+		}
+		if(!files.length){
+			return
+		}
+		this.locked = true
+		this.loading(true)
+		
+		var importSongs = new ImportSongs()
+		importSongs.load(files).then(this.songsLoaded.bind(this), e => {
+			this.browse.parentNode.reset()
+			this.locked = false
+			this.loading(false)
+			if(e !== "cancel"){
+				return Promise.reject(e)
+			}
+		})
+	}
+	gdriveFolder(){
+		if(this.locked){
+			return
+		}
+		this.locked = true
+		this.loading(true)
+		var importSongs = new ImportSongs(true)
+		if(!gpicker){
+			var gpickerPromise = loader.loadScript("/src/js/gpicker.js").then(() => {
+				gpicker = new Gpicker()
+			})
+		}else{
+			var gpickerPromise = Promise.resolve()
+		}
+		gpickerPromise.then(() => {
+			return gpicker.browse(locked => {
+				this.locked = locked
+				this.loading(locked)
+			})
+		}).then(files => importSongs.load(files))
+		.then(this.songsLoaded.bind(this))
+		.catch(e => {
+			this.locked = false
+			this.loading(false)
+			if(e !== "cancel"){
+				return Promise.reject(e)
+			}
+		})
+	}
+	loading(show){
+		if(show){
+			loader.screen.appendChild(this.loaderDiv)
+		}else{
+			loader.screen.removeChild(this.loaderDiv)
+		}
+	}
+	songsLoaded(songs){
+		var length = songs.length
+		assets.songs = songs
+		assets.customSongs = true
+		assets.customSelected = 0
+		assets.sounds["se_don"].play()
+		this.clean()
+		setTimeout(() => {
+			new SongSelect("customSongs", false, this.touchEnabled)
+			pageEvents.send("import-songs", length)
+		}, 500)
+	}
+	keyPressed(pressed, name){
+		if(!pressed || this.locked){
+			return
+		}
+		var selected = this.items[this.selected]
+		if(name === "confirm" || name === "confirmPad"){
+			if(selected === this.endButton){
+				this.onEnd()
+			}else if(name !== "confirmPad"){
+				if(selected === this.linkLocalFolder){
+					assets.sounds["se_don"].play()
+					this.localFolder()
+				}else if(selected === this.linkGdriveFolder){
+					assets.sounds["se_don"].play()
+					this.gdriveFolder()
+				}
+			}
+		}else if(name === "previous" || name === "next"){
+			selected.classList.remove("selected")
+			this.selected = this.mod(this.items.length, this.selected + (name === "next" ? 1 : -1))
+			this.items[this.selected].classList.add("selected")
+			assets.sounds["se_ka"].play()
+		}else if(name === "back"){
+			this.onEnd()
+		}
+	}
+	mod(length, index){
+		return ((index % length) + length) % length
+	}
+	onEnd(event){
+		if(this.locked){
+			return
+		}
+		var touched = false
+		if(event){
+			if(event.type === "touchstart"){
+				event.preventDefault()
+				touched = true
+			}else if(event.which !== 1){
+				return
+			}
+		}
+		this.clean()
+		assets.sounds["se_don"].play()
+		setTimeout(() => {
+			new SongSelect("customSongs", false, touched)
+		}, 500)
+	}
+	clean(){
+		this.keyboard.clean()
+		this.gamepad.clean()
+		pageEvents.remove(this.browse, "change")
+		if(this.hasLocal){
+			pageEvents.remove(this.linkLocalFolder, ["mousedown", "touchstart"])
+		}
+		if(gameConfig.google_credentials.gdrive_enabled){
+			pageEvents.remove(this.linkGdriveFolder, ["mousedown", "touchstart"])
+		}
+		pageEvents.remove(this.endButton, ["mousedown", "touchstart"])
+		delete this.browse
+		delete this.linkLocalFolder
+		delete this.linkGdriveFolder
+		delete this.endButton
+		delete this.items
+		delete this.loaderDiv
+	}
+}

public/src/js/gpicker.js

@@ -0,0 +1,185 @@
+class Gpicker{
+	constructor(){
+		this.apiKey = gameConfig.google_credentials.api_key
+		this.oauthClientId = gameConfig.google_credentials.oauth_client_id
+		this.projectNumber = gameConfig.google_credentials.project_number
+		this.scope = "https://www.googleapis.com/auth/drive.readonly"
+		this.folder = "application/vnd.google-apps.folder"
+		this.filesUrl = "https://www.googleapis.com/drive/v3/files/"
+		this.resolveQueue = []
+		this.queueActive = false
+	}
+	browse(lockedCallback){
+		return this.loadApi()
+		.then(() => this.getToken(lockedCallback))
+		.then(() => new Promise((resolve, reject) => {
+			this.displayPicker(data => {
+				if(data.action === "picked"){
+					var file = data.docs[0]
+					var walk = (files, output=[]) => {
+						var batch = null
+						for(var i = 0; i < files.length; i++){
+							var path = files[i].path ? files[i].path + "/" : ""
+							var list = files[i].list
+							for(var j = 0; j < list.length; j++){
+								var file = list[j]
+								if(file.mimeType === this.folder){
+									if(!batch){
+										batch = gapi.client.newBatch()
+									}
+									batch.add(gapi.client.drive.files.list({
+										q: "'" + file.id + "' in parents",
+										orderBy: "name_natural"
+									}), {
+										id: path + file.name
+									})
+								}else{
+									output.push(new GdriveFile({
+										path: path + file.name,
+										name: file.name,
+										id: file.id
+									}))
+								}
+							}
+						}
+						if(batch){
+							return this.queue()
+							.then(() => batch.then(responses => {
+								var files = []
+								for(var path in responses.result){
+									files.push({path: path, list: responses.result[path].result.files})
+								}
+								return walk(files, output)
+							}))
+						}else{
+							return output
+						}
+					}
+					if(file.mimeType === this.folder){
+						return walk([{list: [file]}]).then(resolve, reject)
+					}else{
+						return reject("cancel")
+					}
+				}else if(data.action === "cancel"){
+					return reject("cancel")
+				}
+			})
+		}))
+	}
+	loadApi(){
+		if(window.gapi && gapi.client && gapi.client.drive){
+			return
+		}
+		return loader.loadScript("https://apis.google.com/js/api.js")
+		.then(() => new Promise((resolve, reject) =>
+			gapi.load("auth2:picker:client", {
+				callback: resolve,
+				onerror: reject
+			})
+		))
+		.then(() => new Promise((resolve, reject) =>
+			gapi.client.load("drive", "v3").then(resolve, reject)
+		))
+	}
+	getToken(lockedCallback){
+		if(this.oauthToken){
+			return
+		}
+		if(!this.auth){
+			var authPromise = gapi.auth2.init({
+				clientId: this.oauthClientId,
+				fetch_basic_profile: false,
+				scope: this.scope
+			}).then(() => {
+				this.auth = gapi.auth2.getAuthInstance()
+			}, e => {
+				if(e.details){
+					alert(strings.gpicker.authError.replace("%s", e.details))
+				}
+				return Promise.reject(e)
+			})
+		}else{
+			var authPromise = Promise.resolve()
+		}
+		return authPromise.then(() => {
+			var user = this.auth.currentUser.get()
+			if(!this.checkScope(user)){
+				lockedCallback(false)
+				this.auth.signIn().then(user => {
+					if(this.checkScope(user)){
+						lockedCallback(true)
+					}else{
+						return Promise.reject("cancel")
+					}
+				})
+			}
+		})
+	}
+	checkScope(user){
+		if(user.hasGrantedScopes(this.scope)){
+			this.oauthToken = user.getAuthResponse(true).access_token
+			return this.oauthToken
+		}else{
+			return false
+		}
+	}
+	displayPicker(callback){
+		var picker = gapi.picker.api
+		new picker.PickerBuilder()
+			.setDeveloperKey(this.apiKey)
+			.setAppId(this.projectNumber)
+			.setOAuthToken(this.oauthToken)
+			.hideTitleBar()
+			.addView(new picker.DocsView("folders")
+				.setLabel(strings.gpicker.myDrive)
+				.setParent("root")
+				.setSelectFolderEnabled(true)
+				.setMode("grid")
+			)
+			.addView(new picker.DocsView("folders")
+				.setLabel(strings.gpicker.starred)
+				.setStarred(true)
+				.setSelectFolderEnabled(true)
+				.setMode("grid")
+			)
+			.addView(new picker.DocsView("folders")
+				.setLabel(strings.gpicker.sharedWithMe)
+				.setOwnedByMe(false)
+				.setSelectFolderEnabled(true)
+				.setMode("list")
+			)
+			.setCallback(callback)
+			.setSize(Infinity, Infinity)
+			.build()
+			.setVisible(true)
+	}
+	downloadFile(id, arrayBuffer){
+		return this.queue().then(() =>
+			loader.ajax(this.filesUrl + id + "?alt=media", request => {
+				if(arrayBuffer){
+					request.responseType = "arraybuffer"
+				}
+				request.setRequestHeader("Authorization", "Bearer " + this.oauthToken)
+			})
+		)
+	}
+	queue(){
+		return new Promise(resolve => {
+			this.resolveQueue.push(resolve)
+			if(!this.queueActive){
+				this.queueActive = true
+				this.queueTimer = setInterval(this.parseQueue.bind(this), 100)
+				this.parseQueue()
+			}
+		})
+	}
+	parseQueue(){
+		if(this.resolveQueue.length){
+			var resolve = this.resolveQueue.shift()
+			resolve()
+		}else{
+			this.queueActive = false
+			clearInterval(this.queueTimer)
+		}
+	}
+}

public/src/js/importsongs.js

@@ -1,32 +1,10 @@
 class ImportSongs{
-	constructor(songSelect, event){
-		this.songSelect = songSelect
-		this.songSelect.redrawRunning = false
-		this.songSelect.pointer(false)
-		
-		this.loaderDiv = document.createElement("div")
-		this.loaderDiv.innerHTML = assets.pages["loadsong"]
-		loader.screen.appendChild(this.loaderDiv)
-		var loadingText = document.getElementById("loading-text")
-		loadingText.appendChild(document.createTextNode(strings.loading))
-		loadingText.setAttribute("alt", strings.loading)
-		
-		var files = []
-		for(var i = 0; i < event.target.files.length; i++){
-			files.push(event.target.files[i])
-		}
-		var extensionRegex = /\.[^\/]+$/
-		files.sort((a, b) => {
-			var path1 = a.webkitRelativePath.replace(extensionRegex, "")
-			var path2 = b.webkitRelativePath.replace(extensionRegex, "")
-			return path1 > path2 ? 1 : -1
-		})
-		
+	constructor(limited, otherFiles){
+		this.limited = limited
 		this.tjaFiles = []
 		this.osuFiles = []
 		this.assetFiles = {}
-		var metaFiles = []
-		this.otherFiles = {}
+		this.otherFiles = otherFiles || {}
 		this.songs = []
 		this.stylesheet = []
 		this.songTitle = {}
@@ -38,7 +16,6 @@
 			"oni": 3,
 			"ura": 4
 		}
-		
 		this.categoryAliases = {}
 		assets.categories.forEach(cat => {
 			this.categoryAliases[cat.title.toLowerCase()] = cat.id
@@ -53,7 +30,6 @@
 				}
 			}
 		})
-		
 		this.assetSelectors = {
 			"bg-pattern-1": ".pattern-bg",
 			"bg_genre_0": "#song-select",
@@ -66,11 +42,20 @@
 			"bg_stage_2": ".song-stage-2",
 			"bg_stage_3": ".song-stage-3"
 		}
+	}
+	load(files){
+		var extensionRegex = /\.[^\/]+$/
+		files.sort((a, b) => {
+			var path1 = a.path.replace(extensionRegex, "")
+			var path2 = b.path.replace(extensionRegex, "")
+			return path1 > path2 ? 1 : -1
+		})
 		
+		var metaFiles = []
 		for(var i = 0; i < files.length; i++){
 			var file = files[i]
 			var name = file.name.toLowerCase()
-			var path = file.webkitRelativePath.toLowerCase()
+			var path = file.path.toLowerCase()
 			if(name.endsWith(".tja")){
 				this.tjaFiles.push({
 					file: file,
@@ -81,13 +66,13 @@
 					file: file,
 					index: i
 				})
-			}else if(name === "genre.ini" || name === "box.def" || name === "songtitle.txt"){
-				var level = (file.webkitRelativePath.match(/\//g) || []).length
+			}else if(!this.limited && (name === "genre.ini" || name === "box.def" || name === "songtitle.txt")){
+				var level = (file.path.match(/\//g) || []).length
 				metaFiles.push({
 					file: file,
 					level: (level * 2) + (name === "genre.ini" ? 1 : 0)
 				})
-			}else if(path.indexOf("/taiko-web assets/") !== -1){
+			}else if(!this.limited && path.indexOf("/taiko-web assets/") !== -1){
 				if(!(name in this.assetFiles)){
 					this.assetFiles[name] = file
 				}
@@ -97,32 +82,30 @@
 		}
 		
 		var metaPromises = []
-		
 		metaFiles.forEach(fileObj => {
 			metaPromises.push(this.addMeta(fileObj))
 		})
 		
-		Promise.all(metaPromises).then(() => {
+		return Promise.all(metaPromises).then(() => {
 			var songPromises = []
 			
 			this.tjaFiles.forEach(fileObj => {
-				songPromises.push(this.addTja(fileObj))
+				songPromises.push(this.addTja(fileObj).catch(e => console.warn(e)))
 			})
 			this.osuFiles.forEach(fileObj => {
-				songPromises.push(this.addOsu(fileObj))
+				songPromises.push(this.addOsu(fileObj).catch(e => console.warn(e)))
 			})
 			songPromises.push(this.addAssets())
-			Promise.all(songPromises).then(this.loaded.bind(this))
-		})
+			return Promise.all(songPromises)
+		}).then(this.loaded.bind(this))
 	}
 	
 	addMeta(fileObj){
 		var file = fileObj.file
 		var level = fileObj.level
 		var name = file.name.toLowerCase()
-		var reader = new FileReader()
-		var promise = pageEvents.load(reader).then(event => {
-			var data = event.target.result.replace(/\0/g, "").split("\n")
+		return file.read(name === "songtitle.txt" ? undefined : "sjis").then(data => {
+			var data = data.replace(/\0/g, "").split("\n")
 			var category
 			if(name === "genre.ini"){
 				var key
@@ -177,9 +160,9 @@
 				}
 			}
 			if(category){
-				var metaPath = file.webkitRelativePath.toLowerCase().slice(0, file.name.length * -1)
+				var metaPath = file.path.toLowerCase().slice(0, file.name.length * -1)
 				var filesLoop = fileObj => {
-					var tjaPath = fileObj.file.webkitRelativePath.toLowerCase().slice(0, fileObj.file.name.length * -1)
+					var tjaPath = fileObj.file.path.toLowerCase().slice(0, fileObj.file.name.length * -1)
 					if(tjaPath.startsWith(metaPath) && (!("categoryLevel" in fileObj) || fileObj.categoryLevel < level)){
 						if(category.toLowerCase() in this.categoryAliases){
 							fileObj.category_id = this.categoryAliases[category.toLowerCase()]
@@ -192,13 +175,9 @@
 				this.tjaFiles.forEach(filesLoop)
 				this.osuFiles.forEach(filesLoop)
 			}
-		}).catch(() => {})
-		if(name === "songtitle.txt"){
-			reader.readAsText(file)
-		}else{
-			reader.readAsText(file, "sjis")
-		}
-		return promise
+		}).catch(e => {
+			console.warn(e)
+		})
 	}
 	
 	addTja(fileObj){
@@ -206,24 +185,33 @@
 		var index = fileObj.index
 		var category = fileObj.category
 		var category_id = fileObj.category_id
-		var reader = new FileReader()
-		var promise = pageEvents.load(reader).then(event => {
-			var data = event.target.result.replace(/\0/g, "").split("\n")
+		if(!this.limited){
+			var filePromise = file.read("sjis")
+		}else{
+			var filePromise = Promise.resolve()
+		}
+		return filePromise.then(dataRaw => {
+			var data = dataRaw ? dataRaw.replace(/\0/g, "").split("\n") : []
 			var tja = new ParseTja(data, "oni", 0, 0, true)
 			var songObj = {
 				id: index + 1,
 				order: index + 1,
+				title: file.name.slice(0, file.name.lastIndexOf(".")),
 				type: "tja",
 				chart: file,
 				courses: {},
-				music: "muted"
+				music: "muted",
+				custom: true
+			}
+			if(this.limited){
+				songObj.unloaded = true
 			}
 			var coursesAdded = false
 			var titleLang = {}
 			var titleLangAdded = false
 			var subtitleLangAdded = false
 			var subtitleLang = {}
-			var dir = file.webkitRelativePath.toLowerCase()
+			var dir = file.path.toLowerCase()
 			dir = dir.slice(0, dir.lastIndexOf("/") + 1)
 			for(var diff in tja.metadata){
 				var meta = tja.metadata[diff]
@@ -321,19 +309,19 @@
 					songObj.category_id = category_id
 				}
 			}
-			if(coursesAdded){
+			if(coursesAdded || songObj.unloaded){
 				this.songs[index] = songObj
 			}
-			var hash = md5.base64(event.target.result).slice(0, -2)
-			songObj.hash = hash
-			scoreStorage.songTitles[songObj.title] = hash
-			var score = scoreStorage.get(hash, false, true)
-			if(score){
-				score.title = songObj.title
+			if(!this.limited){
+				var hash = md5.base64(dataRaw).slice(0, -2)
+				songObj.hash = hash
+				scoreStorage.songTitles[songObj.title] = hash
+				var score = scoreStorage.get(hash, false, true)
+				if(score){
+					score.title = songObj.title
+				}
 			}
-		}).catch(() => {})
-		reader.readAsText(file, "sjis")
-		return promise
+		})
 	}
 	
 	addOsu(fileObj){
@@ -341,11 +329,15 @@
 		var index = fileObj.index
 		var category = fileObj.category
 		var category_id = fileObj.category_id
-		var reader = new FileReader()
-		var promise = pageEvents.load(reader).then(event => {
-			var data = event.target.result.replace(/\0/g, "").split("\n")
-			var osu = new ParseOsu(data, "oni", 0, 0, true);
-			var dir = file.webkitRelativePath.toLowerCase()
+		if(!this.limited){
+			var filePromise = file.read()
+		}else{
+			var filePromise = Promise.resolve()
+		}
+		return filePromise.then(dataRaw => {
+			var data = dataRaw ? dataRaw.replace(/\0/g, "").split("\n") : []
+			var osu = new ParseOsu(data, "oni", 0, 0, true)
+			var dir = file.path.toLowerCase()
 			dir = dir.slice(0, dir.lastIndexOf("/") + 1)
 			var songObj = {
 				id: index + 1,
@@ -356,14 +348,17 @@
 				subtitle_lang: {
 					en: osu.metadata.Artist || osu.metadata.ArtistUnicode
 				},
-				preview: osu.generalInfo.PreviewTime / 1000,
-				courses: {
-					oni:{
-						stars: parseInt(osu.difficulty.overallDifficulty) || 0,
-						branch: false
-					}
-				},
-				music: this.otherFiles[dir + osu.generalInfo.AudioFilename.toLowerCase()] || "muted"
+				preview: osu.generalInfo.PreviewTime ? osu.generalInfo.PreviewTime / 1000 : 0,
+				courses: {},
+				music: (osu.generalInfo.AudioFilename ? this.otherFiles[dir + osu.generalInfo.AudioFilename.toLowerCase()] : "") || "muted"
+			}
+			if(!this.limited){
+				songObj.courses.oni = {
+					stars: parseInt(osu.difficulty.overallDifficulty) || 0,
+					branch: false
+				}
+			}else{
+				songObj.unloaded = true
 			}
 			var filename = file.name.slice(0, file.name.lastIndexOf("."))
 			var title = osu.metadata.TitleUnicode || osu.metadata.Title || file.name.slice(0, file.name.lastIndexOf("."))
@@ -375,7 +370,7 @@
 				}
 				songObj.title = title + suffix
 				songObj.title_lang = {
-					en: (osu.metadata.Title || osu.metadata.TitleUnicode) + suffix
+					en: (osu.metadata.Title || osu.metadata.TitleUnicode || title) + suffix
 				}
 			}else{
 				songObj.title = filename
@@ -389,72 +384,68 @@
 			}else{
 				songObj.category_id = category_id
 			}
-			var hash = md5.base64(event.target.result).slice(0, -2)
-			songObj.hash = hash
-			scoreStorage.songTitles[songObj.title] = hash
-			var score = scoreStorage.get(hash, false, true)
-			if(score){
-				score.title = songObj.title
+			if(!this.limited){
+				var hash = md5.base64(dataRaw).slice(0, -2)
+				songObj.hash = hash
+				scoreStorage.songTitles[songObj.title] = hash
+				var score = scoreStorage.get(hash, false, true)
+				if(score){
+					score.title = songObj.title
+				}
 			}
-		}).catch(() => {})
-		reader.readAsText(file)
-		return promise
+		})
 	}
 	
 	addAssets(){
-		return new Promise((resolve, reject) => {
-			var promises = []
-			for(let name in this.assetFiles){
-				let id = this.getFilename(name)
-				var file = this.assetFiles[name]
-				if(name === "vectors.json"){
-					var reader = new FileReader()
-					promises.push(pageEvents.load(reader).then(() => response => {
-						vectors = JSON.parse(response)
-					}))
-					reader.readAsText(file)
-				}
-				if(assets.img.indexOf(name) !== -1){
-					let image = document.createElement("img")
-					promises.push(pageEvents.load(image).then(() => {
-						if(id in this.assetSelectors){
-							var selector = this.assetSelectors[id]
-							this.stylesheet.push(selector + '{background-image:url("' + image.src + '")}')
-						}
-					}))
-					image.id = name
-					image.src = URL.createObjectURL(file)
-					loader.assetsDiv.appendChild(image)
-					assets.image[id].parentNode.removeChild(assets.image[id])
-					assets.image[id] = image
-				}
-				if(assets.audioSfx.indexOf(name) !== -1){
-					assets.sounds[id].clean()
-					promises.push(this.loadSound(file, name, snd.sfxGain))
-				}
-				if(assets.audioMusic.indexOf(name) !== -1){
-					assets.sounds[id].clean()
-					promises.push(this.loadSound(file, name, snd.musicGain))
-				}
-				if(assets.audioSfxLR.indexOf(name) !== -1){
-					assets.sounds[id + "_p1"].clean()
-					assets.sounds[id + "_p2"].clean()
-					promises.push(this.loadSound(file, name, snd.sfxGain).then(sound => {
-						assets.sounds[id + "_p1"] = assets.sounds[id].copy(snd.sfxGainL)
-						assets.sounds[id + "_p2"] = assets.sounds[id].copy(snd.sfxGainR)
-					}))
-				}
-				if(assets.audioSfxLoud.indexOf(name) !== -1){
-					assets.sounds[id].clean()
-					promises.push(this.loadSound(file, name, snd.sfxLoudGain))
-				}
+		var promises = []
+		for(let name in this.assetFiles){
+			let id = this.getFilename(name)
+			var file = this.assetFiles[name]
+			if(name === "vectors.json"){
+				promises.push(file.read().then(() => response => {
+					vectors = JSON.parse(response)
+				}))
 			}
-			Promise.all(promises).then(resolve, reject)
-		})
+			if(assets.img.indexOf(name) !== -1){
+				let image = document.createElement("img")
+				promises.push(pageEvents.load(image).then(() => {
+					if(id in this.assetSelectors){
+						var selector = this.assetSelectors[id]
+						this.stylesheet.push(selector + '{background-image:url("' + image.src + '")}')
+					}
+				}))
+				image.id = name
+				image.src = URL.createObjectURL(file)
+				loader.assetsDiv.appendChild(image)
+				assets.image[id].parentNode.removeChild(assets.image[id])
+				assets.image[id] = image
+			}
+			if(assets.audioSfx.indexOf(name) !== -1){
+				assets.sounds[id].clean()
+				promises.push(this.loadSound(file, name, snd.sfxGain))
+			}
+			if(assets.audioMusic.indexOf(name) !== -1){
+				assets.sounds[id].clean()
+				promises.push(this.loadSound(file, name, snd.musicGain))
+			}
+			if(assets.audioSfxLR.indexOf(name) !== -1){
+				assets.sounds[id + "_p1"].clean()
+				assets.sounds[id + "_p2"].clean()
+				promises.push(this.loadSound(file, name, snd.sfxGain).then(sound => {
+					assets.sounds[id + "_p1"] = assets.sounds[id].copy(snd.sfxGainL)
+					assets.sounds[id + "_p2"] = assets.sounds[id].copy(snd.sfxGainR)
+				}))
+			}
+			if(assets.audioSfxLoud.indexOf(name) !== -1){
+				assets.sounds[id].clean()
+				promises.push(this.loadSound(file, name, snd.sfxLoudGain))
+			}
+		}
+		return Promise.all(promises)
 	}
 	loadSound(file, name, gain){
 		var id = this.getFilename(name)
-		return gain.load(file, true).then(sound => {
+		return gain.load(file).then(sound => {
 			assets.sounds[id] = sound
 		})
 	}
@@ -463,7 +454,7 @@
 	}
 	
 	getCategory(file, exclude){
-		var path = file.webkitRelativePath.toLowerCase().split("/")
+		var path = file.path.toLowerCase().split("/")
 		for(var i = path.length - 2; i >= 0; i--){
 			var hasTitle = false
 			for(var j in exclude){
@@ -532,24 +523,14 @@
 			document.head.appendChild(style)
 		}
 		if(this.songs.length){
-			var length = this.songs.length
-			assets.songs = this.songs
-			assets.customSongs = true
-			assets.customSelected = 0
-			assets.sounds["se_don"].play()
-			this.songSelect.clean()
-			setTimeout(() => {
-				loader.screen.removeChild(this.loaderDiv)
-				this.clean()
-				new SongSelect("browse", false, this.songSelect.touchEnabled)
-				pageEvents.send("import-songs", length)
-			}, 500)
+			if(this.limited){
+				assets.otherFiles = this.otherFiles
+			}
+			return Promise.resolve(this.songs)
 		}else{
-			loader.screen.removeChild(this.loaderDiv)
-			this.songSelect.browse.parentNode.reset()
-			this.songSelect.redrawRunning = true
-			this.clean()
+			return Promise.reject("cancel")
 		}
+		this.clean()
 	}
 	
 	joinPath(){
@@ -587,7 +568,6 @@
 	}
 	
 	clean(){
-		delete this.loaderDiv
 		delete this.songs
 		delete this.tjaFiles
 		delete this.osuFiles

public/src/js/loader.js

@@ -25,21 +25,13 @@ class Loader{
 		this.loaderPercentage = document.querySelector("#loader .percentage")
 		this.loaderProgress = document.querySelector("#loader .progress")
 		
-		var queryString = gameConfig._version.commit_short ? "?" + gameConfig._version.commit_short : ""
+		this.queryString = gameConfig._version.commit_short ? "?" + gameConfig._version.commit_short : ""
 		
 		if(gameConfig.custom_js){
-			var script = document.createElement("script")
-			var url = gameConfig.custom_js + queryString
-			this.addPromise(pageEvents.load(script), url)
-			script.src = url
-			document.head.appendChild(script)
+			this.addPromise(this.loadScript(gameConfig.custom_js), gameConfig.custom_js)
 		}
 		assets.js.forEach(name => {
-			var script = document.createElement("script")
-			var url = "/src/js/" + name + queryString
-			this.addPromise(pageEvents.load(script), url)
-			script.src = url
-			document.head.appendChild(script)
+			this.addPromise(this.loadScript("/src/js/" + name), "/src/js/" + name)
 		})
 		
 		var pageVersion = versionLink.href
@@ -53,20 +45,19 @@ class Loader{
 				gameConfig._version.commit &&
 				versionLink.href.indexOf(gameConfig._version.commit) === -1
 			){
-				// Version in the config does not match version on the page
-				reject()
+				reject("Version on the page and config does not match\n(page:  " + pageVersion + ",\nconfig: "+ gameConfig._version.commit + ")")
 			}
 			var cssCount = document.styleSheets.length + assets.css.length
 			assets.css.forEach(name => {
 				var stylesheet = document.createElement("link")
 				stylesheet.rel = "stylesheet"
-				stylesheet.href = "/src/css/" + name + queryString
+				stylesheet.href = "/src/css/" + name + this.queryString
 				document.head.appendChild(stylesheet)
 			})
 			assets.assetsCss.forEach(name => {
 				var stylesheet = document.createElement("link")
 				stylesheet.rel = "stylesheet"
-				stylesheet.href = gameConfig.assets_baseurl + name + queryString
+				stylesheet.href = gameConfig.assets_baseurl + name + this.queryString
 				document.head.appendChild(stylesheet)
 			})
 			var checkStyles = () => {
@@ -77,7 +68,7 @@ class Loader{
 			}
 			var interval = setInterval(checkStyles, 100)
 			checkStyles()
-		}), "Version on the page and config does not match\n(page:  " + pageVersion + ",\nconfig: "+ gameConfig._version.commit + ")")
+		}))
 		
 		for(var name in assets.fonts){
 			var url = gameConfig.assets_baseurl + "fonts/" + assets.fonts[name]
@@ -99,7 +90,7 @@ class Loader{
 		
 		assets.views.forEach(name => {
 			var id = this.getFilename(name)
-			var url = "/src/views/" + name + queryString
+			var url = "/src/views/" + name + this.queryString
 			this.addPromise(this.ajax(url).then(page => {
 				assets.pages[id] = page
 			}), url)
@@ -114,7 +105,7 @@ class Loader{
 					cat.songSkin.infoFill = cat.songSkin.info_fill
 					delete cat.songSkin.info_fill
 				}
-			});
+			})
 			
 			assets.categories.push({
 				title: "default",
@@ -127,18 +118,17 @@ class Loader{
 			})
 		}), "/api/categories")
 		
-		this.addPromise(this.ajax("/api/songs").then(songs => {
-			assets.songsDefault = JSON.parse(songs)
-			assets.songs = assets.songsDefault
-		}), "/api/songs")
-		
-		var url = gameConfig.assets_baseurl + "img/vectors.json" + queryString
+		var url = gameConfig.assets_baseurl + "img/vectors.json" + this.queryString
 		this.addPromise(this.ajax(url).then(response => {
 			vectors = JSON.parse(response)
 		}), url)
 		
 		this.afterJSCount =
-			["blurPerformance"].length +
+			[
+				"/api/songs",
+				"blurPerformance",
+				"categories"
+			].length +
 			assets.audioSfx.length +
 			assets.audioMusic.length +
 			assets.audioSfxLR.length +
@@ -150,19 +140,49 @@ class Loader{
 				return
 			}
 			
+			this.addPromise(this.ajax("/api/songs").then(songs => {
+				songs = JSON.parse(songs)
+				songs.forEach(song => {
+					var directory = gameConfig.songs_baseurl + song.id + "/"
+					song.music = new RemoteFile(directory + "main.mp3")
+					if(song.type === "tja"){
+						song.chart = new RemoteFile(directory + "main.tja")
+					}else{
+						song.chart = {separateDiff: true}
+						for(var diff in song.courses){
+							if(song.courses[diff]){
+								song.chart[diff] = new RemoteFile(directory + diff + ".osu")
+							}
+						}
+					}
+					if(song.lyrics){
+						song.lyricsFile = new RemoteFile(gameConfig.songs_baseurl + song.id + "main.vtt")
+					}
+					if(song.preview > 0){
+						song.previewMusic = new RemoteFile(directory + "preview.mp3")
+					}
+				})
+				assets.songsDefault = songs
+				assets.songs = assets.songsDefault
+			}), "/api/songs")
+			
+			var categoryPromises = []
 			assets.categories //load category backgrounds to DOM
-				.filter(cat=>cat.songSkin && cat.songSkin.bg_img)
-				.forEach(cat=>{
+				.filter(cat => cat.songSkin && cat.songSkin.bg_img)
+				.forEach(cat => {
 					let name = cat.songSkin.bg_img
 					var id = this.getFilename(name)
 					var image = document.createElement("img")
 					var url = gameConfig.assets_baseurl + "img/" + name
-					this.addPromise(pageEvents.load(image), url)
+					categoryPromises.push(pageEvents.load(image).catch(response => {
+						this.errorMsg(response, url)
+					}))
 					image.id = name
 					image.src = url
 					this.assetsDiv.appendChild(image)
 					assets.image[id] = image
-			})
+				})
+			this.addPromise(Promise.all(categoryPromises))
 			
 			snd.buffer = new SoundBuffer()
 			snd.musicGain = snd.buffer.createGain()
@@ -307,7 +327,6 @@ class Loader{
 		this.promises.push(promise)
 		promise.then(this.assetLoaded.bind(this), response => {
 			this.errorMsg(response, url)
-			return Promise.resolve()
 		})
 	}
 	soundUrl(name){
@@ -315,7 +334,7 @@ class Loader{
 	}
 	loadSound(name, gain){
 		var id = this.getFilename(name)
-		return gain.load(this.soundUrl(name)).then(sound => {
+		return gain.load(new RemoteFile(this.soundUrl(name))).then(sound => {
 			assets.sounds[id] = sound
 		})
 	}
@@ -415,21 +434,28 @@ class Loader{
 		this.screen.classList[patternBg ? "add" : "remove"]("pattern-bg")
 	}
 	ajax(url, customRequest){
-		return new Promise((resolve, reject) => {
-			var request = new XMLHttpRequest()
-			request.open("GET", url)
-			pageEvents.load(request).then(() => {
-				if(request.status === 200){
-					resolve(request.response)
-				}else{
-					reject()
-				}
-			}, reject)
-			if(customRequest){
-				customRequest(request)
+		var request = new XMLHttpRequest()
+		request.open("GET", url)
+		var promise = pageEvents.load(request).then(() => {
+			if(request.status === 200){
+				return request.response
+			}else{
+				return Promise.reject(`${url} (${request.status})`)
 			}
-			request.send()
 		})
+		if(customRequest){
+			customRequest(request)
+		}
+		request.send()
+		return promise
+	}
+	loadScript(url){
+		var script = document.createElement("script")
+		var url = url + this.queryString
+		var promise = pageEvents.load(script)
+		script.src = url
+		document.head.appendChild(script)
+		return promise
 	}
 	getCsrfToken(){
 		return this.ajax("api/csrftoken").then(response => {

public/src/js/loadsong.js

@@ -34,10 +34,10 @@ class LoadSong{
 	run(){
 		var song = this.selectedSong
 		var id = song.folder
+		var songObj
 		this.promises = []
-		if(song.folder !== "calibration"){
+		if(id !== "calibration"){
 			assets.sounds["v_start"].play()
-			var songObj
 			assets.songs.forEach(song => {
 				if(song.id === id){
 					songObj = song
@@ -50,11 +50,12 @@ class LoadSong{
 				}
 			})
 		}else{
-			var songObj = {
-				"music": "muted",
-				"chart": "blank"
+			songObj = {
+				music: "muted",
+				custom: true
 			}
 		}
+		this.songObj = songObj
 		
 		song.songBg = this.randInt(1, 5)
 		song.songStage = this.randInt(1, 3)
@@ -99,14 +100,14 @@ class LoadSong{
 				}
 				let img = document.createElement("img")
 				let force = imgLoad[i].type === "song" && this.touchEnabled
-				if(!songObj.music && (this.imgScale !== 1 || force)){
+				if(!songObj.custom && (this.imgScale !== 1 || force)){
 					img.crossOrigin = "Anonymous"
 				}
 				let promise = pageEvents.load(img)
 				this.addPromise(promise.then(() => {
 					return this.scaleImg(img, filename, prefix, force)
-				}), songObj.music ? filename + ".png" : skinBase + filename + ".png")
-				if(songObj.music){
+				}), songObj.custom ? filename + ".png" : skinBase + filename + ".png")
+				if(songObj.custom){
 					img.src = URL.createObjectURL(song.songSkin[filename + ".png"])
 				}else{
 					img.src = skinBase + filename + ".png"
@@ -115,57 +116,29 @@ class LoadSong{
 		}
 		this.loadSongBg(id)
 		
-		var url = gameConfig.songs_baseurl + id + "/main.mp3"
-		this.addPromise(new Promise((resolve, reject) => {
-			if(songObj.sound){
-				songObj.sound.gain = snd.musicGain
-				resolve()
-			}else if(!songObj.music){
-				snd.musicGain.load(url).then(sound => {
-					songObj.sound = sound
-					resolve()
-				}, reject)
-			}else if(songObj.music !== "muted"){
-				snd.musicGain.load(songObj.music, true).then(sound => {
-					songObj.sound = sound
-					resolve()
-				}, reject)
-			}else{
-				resolve()
-			}
-		}), songObj.music ? songObj.music.webkitRelativePath : url)
-		if(songObj.chart){
-			if(songObj.chart === "blank"){
-				this.songData = ""
-			}else{
-				var reader = new FileReader()
-				this.addPromise(pageEvents.load(reader).then(event => {
-					this.songData = event.target.result.replace(/\0/g, "").split("\n")
-				}), songObj.chart.webkitRelativePath)
-				if(song.type === "tja"){
-					reader.readAsText(songObj.chart, "sjis")
-				}else{
-					reader.readAsText(songObj.chart)
-				}
-			}
-			if(songObj.lyricsFile && settings.getItem("showLyrics")){
-				var reader = new FileReader()
-				this.addPromise(pageEvents.load(reader).then(event => {
-					songObj.lyricsData = event.target.result
-				}, () => Promise.resolve()), songObj.lyricsFile.webkitRelativePath)
-				reader.readAsText(songObj.lyricsFile)
-			}
-		}else{
-			var url = this.getSongPath(song)
-			this.addPromise(loader.ajax(url).then(data => {
+		if(songObj.sound){
+			songObj.sound.gain = snd.musicGain
+		}else if(songObj.music !== "muted"){
+			this.addPromise(snd.musicGain.load(songObj.music).then(sound => {
+				songObj.sound = sound
+			}), songObj.music.url)
+		}
+		var chart = songObj.chart
+		if(chart.separateDiff){
+			var chartDiff = this.selectedSong.difficulty
+			chart = chart[chartDiff]
+		}
+		if(chart){
+			this.addPromise(chart.read(song.type === "tja" ? "sjis" : "").then(data => {
 				this.songData = data.replace(/\0/g, "").split("\n")
-			}), url)
-			if(song.lyrics && !songObj.lyricsData && !this.multiplayer && (!this.touchEnabled || this.autoPlayEnabled) && settings.getItem("showLyrics")){
-				var url = this.getSongDir(song) + "main.vtt"
-				this.addPromise(loader.ajax(url).then(data => {
-					songObj.lyricsData = data
-				}), url)
-			}
+			}), chart.url)
+		}else{
+			this.songData = ""
+		}
+		if(songObj.lyricsFile && !songObj.lyricsData && !this.multiplayer && (!this.touchEnabled || this.autoPlayEnabled) && settings.getItem("showLyrics")){
+			this.addPromise(songObj.lyricsFile.read().then(data => {
+				songObj.lyricsData = data
+			}, () => {}), songObj.lyricsFile.url)
 		}
 		if(this.touchEnabled && !assets.image["touch_drum"]){
 			let img = document.createElement("img")
@@ -289,17 +262,6 @@ class LoadSong{
 	randInt(min, max){
 		return Math.floor(Math.random() * (max - min + 1)) + min
 	}
-	getSongDir(selectedSong){
-		return gameConfig.songs_baseurl + selectedSong.folder + "/"
-	}
-	getSongPath(selectedSong){
-		var directory = this.getSongDir(selectedSong)
-		if(selectedSong.type === "tja"){
-			return directory + "main.tja"
-		}else{
-			return directory + selectedSong.difficulty + ".osu"
-		}
-	}
 	setupMultiplayer(){
 		var song = this.selectedSong
 		
@@ -326,13 +288,14 @@ class LoadSong{
 							this.selectedSong2[i] = this.selectedSong[i]
 						}
 						this.selectedSong2.difficulty = event.value.diff
-						if(song.type === "tja"){
+						var chart = this.songObj.chart
+						var chartDiff = this.selectedSong2.difficulty
+						if(song.type === "tja" || !chart || !chart.separateDiff || !chart[chartDiff]){
 							this.startMultiplayer()
 						}else{
-							loader.ajax(this.getSongPath(this.selectedSong2)).then(data => {
+							chart[chartDiff].read(song.type === "tja" ? "sjis" : "").then(data => {
 								this.song2Data = data.replace(/\0/g, "").split("\n")
-								this.startMultiplayer()
-							}, () => {
+							}, () => {}).then(() => {
 								this.startMultiplayer()
 							})
 						}
@@ -389,6 +352,7 @@ class LoadSong{
 	}
 	clean(){
 		delete this.promises
+		delete this.songObj
 		pageEvents.remove(p2, "message")
 		if(this.cancelButton){
 			pageEvents.remove(this.cancelButton, ["mousedown", "touchstart"])

public/src/js/main.js

@@ -89,6 +89,7 @@ var vectors
 var settings
 var scoreStorage
 var account = {}
+var gpicker
 
 pageEvents.add(root, ["touchstart", "touchmove", "touchend"], event => {
 	if(event.cancelable && cancelTouch && event.target.tagName !== "SELECT"){

public/src/js/songselect.js

@@ -49,7 +49,7 @@ class SongSelect{
 				border: ["#dec4fd", "#a543ef"],
 				outline: "#a741ef"
 			},
-			"browse": {
+			"customSongs": {
 				sort: 0,
 				background: "#fab5d3",
 				border: ["#ffe7ef", "#d36aa2"],
@@ -80,42 +80,7 @@ class SongSelect{
 		
 		this.songs = []
 		for(let song of assets.songs){
-			var title = this.getLocalTitle(song.title, song.title_lang)
-			var subtitle = this.getLocalTitle(title === song.title ? song.subtitle : "", song.subtitle_lang)
-			var skin = null
-			var categoryName = ""
-			var originalCategory = ""
-			if(song.category_id !== null && song.category_id !== undefined){
-				var category = assets.categories.find(cat => cat.id === song.category_id)
-				var categoryName = this.getLocalTitle(category.title, category.title_lang)
-				var originalCategory = category.title
-				var skin = this.songSkin[category.title]
-			}else if(song.category){
-				var categoryName = song.category
-				var originalCategory = song.category
-			}
-			this.songs.push({
-				id: song.id,
-				title: title,
-				originalTitle: song.title,
-				subtitle: subtitle,
-				skin: skin || this.songSkin.default,
-				courses: song.courses,
-				originalCategory: originalCategory,
-				category: categoryName,
-				category_id: song.category_id,
-				preview: song.preview || 0,
-				type: song.type,
-				offset: song.offset,
-				songSkin: song.song_skin || {},
-				music: song.music,
-				volume: song.volume,
-				maker: song.maker,
-				canJump: true,
-				hash: song.hash || song.title,
-				order: song.order,
-				lyrics: song.lyrics
-			})
+			this.songs.push(this.addSong(song))
 		}
 		this.songs.sort((a, b) => {
 			var catA = a.originalCategory in this.songSkin ? this.songSkin[a.originalCategory] : this.songSkin.default
@@ -170,17 +135,26 @@ class SongSelect{
 			action: "settings",
 			category: strings.random
 		})
-		if("webkitdirectory" in HTMLInputElement.prototype && !(/Android|iPhone|iPad/.test(navigator.userAgent))){
-			this.browse = document.getElementById("browse")
-			pageEvents.add(this.browse, "change", this.browseChange.bind(this))
 		
+		var showCustom = false
+		if(gameConfig.google_credentials.gdrive_enabled){
+			if(!(/iPhone|iPad/.test(navigator.userAgent))){
+				showCustom = true
+			}
+		}else{
+			if("webkitdirectory" in HTMLInputElement.prototype && !(/Android|iPhone|iPad/.test(navigator.userAgent))){
+				showCustom = true
+			}
+		}
+		if(showCustom){
 			this.songs.push({
-				title: assets.customSongs ? strings.defaultSongList : strings.browse,
-				skin: this.songSkin.browse,
-				action: "browse",
+				title: assets.customSongs ? strings.customSongs.default : strings.customSongs.title,
+				skin: this.songSkin.customSongs,
+				action: "customSongs",
 				category: strings.random
 			})
 		}
+		
 		this.songs.push({
 			title: strings.back,
 			skin: this.songSkin.back,
@@ -501,11 +475,11 @@ class SongSelect{
 		event.preventDefault()
 		if(this.state.screen === "song" && this.redrawRunning){
 			var currentSong = this.songs[this.selectedSong]
-			if(currentSong.action === "browse"){
+			if(currentSong.action === "customSongs"){
 				var mouse = this.mouseOffset(event.changedTouches[0].pageX, event.changedTouches[0].pageY)
 				var moveBy = this.songSelMouse(mouse.x, mouse.y)
 				if(moveBy === 0){
-					this.toBrowse()
+					this.toCustomSongs()
 				}
 			}
 		}
@@ -668,10 +642,6 @@ class SongSelect{
 		}
 	}
 	
-	browseChange(event){
-		new ImportSongs(this, event)
-	}
-	
 	toSelectDifficulty(fromP2){
 		var currentSong = this.songs[this.selectedSong]
 		if(p2.session && !fromP2 && currentSong.action !== "random"){
@@ -686,6 +656,9 @@ class SongSelect{
 			}
 		}else if(this.state.locked === 0 || fromP2){
 			if(currentSong.courses){
+				if(currentSong.unloaded){
+					return
+				}
 				this.state.screen = "difficulty"
 				this.state.screenMS = this.getMS()
 				this.state.locked = true
@@ -721,8 +694,8 @@ class SongSelect{
 				this.toAbout()
 			}else if(currentSong.action === "settings"){
 				this.toSettings()
-			}else if(currentSong.action === "browse"){
-				this.toBrowse()
+			}else if(currentSong.action === "customSongs"){
+				this.toCustomSongs()
 			}
 		}
 		this.pointer(false)
@@ -857,18 +830,25 @@ class SongSelect{
 			}, 500)
 		}
 	}
-	toBrowse(){
+	toCustomSongs(){
 		if(assets.customSongs){
 			assets.customSongs = false
 			assets.songs = assets.songsDefault
+			delete assets.otherFiles
 			this.playSound("se_don")
 			this.clean()
 			setTimeout(() => {
-				new SongSelect("browse", false, this.touchEnabled)
+				new SongSelect("customSongs", false, this.touchEnabled)
 			}, 500)
 			pageEvents.send("import-songs-default")
 		}else{
-			this.browse.click()
+			localStorage["selectedSong"] = this.selectedSong
+			
+			this.playSound("se_don")
+			this.clean()
+			setTimeout(() => {
+				new CustomSongs(this.touchEnabled)
+			}, 500)
 		}
 	}
 	
@@ -2420,30 +2400,31 @@ class SongSelect{
 				}
 			}else{
 				songObj = {id: id}
-				
-				var previewFilename = prvTime > 0 ? "/preview.mp3" : "/main.mp3"
-				
-				var loadPreview = previewFilename => {
-					return snd.previewGain.load(gameConfig.songs_baseurl + id + previewFilename)
-				}
-				
-				new Promise((resolve, reject) => {
-					if(!currentSong.music){
-						songObj.preview_time = 0
-						loadPreview(previewFilename).catch(() => {
-							songObj.preview_time = prvTime
-							return loadPreview("/main.mp3")
-						}).then(resolve, reject)
-					}else if(currentSong.music !== "muted"){
+				if(currentSong.previewMusic){
+					songObj.preview_time = 0
+					var promise = snd.previewGain.load(currentSong.previewMusic).catch(() => {
 						songObj.preview_time = prvTime
-						snd.previewGain.load(currentSong.music, true).then(resolve, reject)
-					}
-				}).then(sound => {
-					if(currentId === this.previewId){
+						return snd.previewGain.load(currentSong.music)
+					})
+				}else if(currentSong.unloaded){
+					var promise = this.getUnloaded(this.selectedSong, songObj)
+				}else if(currentSong.sound){
+					songObj.preview_time = prvTime
+					currentSong.sound.gain = snd.previewGain
+					var promise = Promise.resolve(currentSong.sound)
+				}else if(currentSong.music !== "muted"){
+					songObj.preview_time = prvTime
+					var promise = snd.previewGain.load(currentSong.music)
+				}else{
+					return
+				}
+				promise.then(sound => {
+					if(currentId === this.previewId || loadOnly){
 						songObj.preview_sound = sound
-						this.preview = sound
-						this.previewLoaded(startLoad, songObj.preview_time, currentSong.volume)
-						
+						if(!loadOnly){
+							this.preview = sound
+							this.previewLoaded(startLoad, songObj.preview_time, currentSong.volume)
+						}
 						var oldPreview = this.previewList.shift()
 						if(oldPreview){
 							oldPreview.preview_sound.clean()
@@ -2452,6 +2433,10 @@ class SongSelect{
 					}else{
 						sound.clean()
 					}
+				}).catch(e => {
+					if(e !== "cancel"){
+						return Promise.reject(e)
+					}
 				})
 			}
 		}
@@ -2483,6 +2468,72 @@ class SongSelect{
 			snd.musicGain.fadeOut(0.4)
 		}
 	}
+	getUnloaded(selectedSong, songObj){
+		var currentSong = this.songs[selectedSong]
+		var file = currentSong.chart
+		var importSongs = new ImportSongs(false, assets.otherFiles)
+		return file.read(currentSong.type === "tja" ? "sjis" : "").then(data => {
+			currentSong.chart = new CachedFile(data, file)
+			return importSongs.addTja({
+				file: currentSong.chart,
+				index: 0
+			})
+		}).then(() => {
+			var imported = importSongs.songs[0]
+			importSongs.clean()
+			imported.id = currentSong.id
+			imported.order = currentSong.order
+			delete imported.song_skin
+			songObj.preview_time = imported.preview
+			if(imported.music){
+				return snd.previewGain.load(imported.music).then(sound => {
+					imported.sound = sound
+					var index = assets.songs.findIndex(song => song.id === currentSong.id)
+					if(index !== -1){
+						assets.songs[index] = imported
+					}
+					this.songs[selectedSong] = this.addSong(imported)
+					return sound.copy()
+				})
+			}else{
+				return Promise.reject("cancel")
+			}
+		})
+	}
+	addSong(song){
+		var title = this.getLocalTitle(song.title, song.title_lang)
+		var subtitle = this.getLocalTitle(title === song.title ? song.subtitle : "", song.subtitle_lang)
+		var skin = null
+		var categoryName = ""
+		var originalCategory = ""
+		if(song.category_id !== null && song.category_id !== undefined){
+			var category = assets.categories.find(cat => cat.id === song.category_id)
+			var categoryName = this.getLocalTitle(category.title, category.title_lang)
+			var originalCategory = category.title
+			var skin = this.songSkin[category.title]
+		}else if(song.category){
+			var categoryName = song.category
+			var originalCategory = song.category
+		}
+		var addedSong = {
+			title: title,
+			originalTitle: song.title,
+			subtitle: subtitle,
+			skin: skin || this.songSkin.default,
+			originalCategory: originalCategory,
+			category: categoryName,
+			preview: song.preview || 0,
+			songSkin: song.song_skin || {},
+			canJump: true,
+			hash: song.hash || song.title
+		}
+		for(var i in song){
+			if(!(i in addedSong)){
+				addedSong[i] = song[i]
+			}
+		}
+		return addedSong
+	}
 	
 	onusers(response){
 		this.songs.forEach(song => {
@@ -2657,8 +2708,6 @@ class SongSelect{
 			pageEvents.remove(this.touchFullBtn, "click")
 			delete this.touchFullBtn
 		}
-		pageEvents.remove(this.browse, "change")
-		delete this.browse
 		delete this.selectable
 		delete this.ctx
 		delete this.canvas

public/src/js/soundbuffer.js

@@ -5,24 +5,11 @@
 		pageEvents.add(window, ["click", "touchend", "keypress"], this.pageClicked.bind(this))
 		this.gainList = []
 	}
-	load(url, local, gain){
-		if(local){
-			var reader = new FileReader()
-			var loadPromise = pageEvents.load(reader).then(event => {
-				return event.target.result
-			})
-			reader.readAsArrayBuffer(url)
-		}else{
-			var loadPromise = loader.ajax(url, request => {
-				request.responseType = "arraybuffer"
-			})
-		}
-		return loadPromise.then(response => {
+	load(file, gain){
+		return file.arrayBuffer().then(response => {
 			return new Promise((resolve, reject) => {
 				return this.context.decodeAudioData(response, resolve, reject)
-			}).catch(error => {
-				throw [error, url]
-			})
+			}).catch(error => Promise.reject([error, file.url]))
 		}).then(buffer => {
 			return new Sound(gain || {soundBuffer: this}, buffer)
 		})
@@ -90,8 +77,8 @@ class SoundGain{
 		}
 		this.setVolume(1)
 	}
-	load(url, local){
-		return this.soundBuffer.load(url, local, this)
+	load(url){
+		return this.soundBuffer.load(url, this)
 	}
 	convertTime(time, absolute){
 		return this.soundBuffer.convertTime(time, absolute)
@@ -134,7 +121,7 @@ class Sound{
 		this.sources = new Set()
 	}
 	copy(gain){
-		return new Sound(gain, this.buffer)
+		return new Sound(gain || this.gain, this.buffer)
 	}
 	getTime(){
 		return this.soundBuffer.getTime()

public/src/js/strings.js

@@ -102,20 +102,6 @@ var translations = {
 		tw: "遊戲設定",
 		ko: "게임 설정"
 	},
-	browse: {
-		ja: "参照する…",
-		en: "Browse…",
-		cn: "浏览…",
-		tw: "開啟檔案…",
-		ko: "찾아보기…"
-	},
-	defaultSongList: {
-		ja: "デフォルト曲リスト",
-		en: "Default Song List",
-		cn: "默认歌曲列表",
-		tw: "默認歌曲列表",
-		ko: "기본 노래 목록"
-	},
 	songOptions: {
 		ja: "演奏オプション",
 		en: "Song Options",
@@ -1071,6 +1057,43 @@ var translations = {
 		cn: "带歌词",
 		tw: "帶歌詞",
 		ko: "가사가있는"
+	},
+	customSongs: {
+		title: {
+			en: "Custom Song List",
+		},
+		default: {
+			ja: "デフォルト曲リスト",
+			en: "Default Song List",
+			cn: "默认歌曲列表",
+			tw: "默認歌曲列表",
+			ko: "기본 노래 목록"
+		},
+		description: {
+			en: [
+				"Pick a folder with Taiko chart files in TJA format to play on a custom song list!"
+			]
+		},
+		localFolder: {
+			en: "Local Folder..."
+		},
+		gdriveFolder: {
+			en: "Google Drive..."
+		}
+	},
+	gpicker: {
+		myDrive: {
+			en: "My Drive"
+		},
+		starred: {
+			en: "Starred"
+		},
+		sharedWithMe: {
+			en: "Shared with me"
+		},
+		authError: {
+			en: "Auth error: %s"
+		}
 	}
 }
 var allStrings = {}

public/src/views/customsongs.html

@@ -0,0 +1,12 @@
+<div class="view-outer">
+	<div class="view">
+		<div class="view-title stroke-sub"></div>
+		<div class="view-content"></div>
+		<div class="left-buttons">
+			<div id="link-localfolder" class="taibtn stroke-sub link-btn"></div>
+			<div id="link-gdrivefolder" class="taibtn stroke-sub link-btn"></div>
+		</div>
+		<div class="view-end-button taibtn stroke-sub selected"></div>
+	</div>
+	<form><input id="browse" type="file" webkitdirectory multiple></form>
+</div>

public/src/views/songselect.html

@@ -2,5 +2,4 @@
 	<canvas id="song-sel-canvas"></canvas>
 	<div id="song-sel-selectable" tabindex="1"></div>
 	<div id="touch-full-btn"></div>
-	<form><input id="browse" type="file" webkitdirectory multiple></form>
 </div>