From 50b99afa069931418d663deb6e5515006558e4dd Mon Sep 17 00:00:00 2001
From: Andrew Dolgov <noreply@fakecake.org>
Date: Thu, 29 Nov 2018 15:53:10 +0300
Subject: move inline scripts from read.html to read.js; fix some
 eslint-related stuff

---
 js/index.js   |   7 +
 js/offline.js |   5 +
 js/read.js    | 649 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 read.html     | 645 ---------------------------------------------------------
 4 files changed, 659 insertions(+), 647 deletions(-)

diff --git a/js/index.js b/js/index.js
index c0f2e84..a16dd44 100644
--- a/js/index.js
+++ b/js/index.js
@@ -4,6 +4,7 @@
 
 let _dl_progress_timeout;
 
+/* exported cache_refresh */
 function cache_refresh(force) {
 	if ('serviceWorker' in navigator) {
 		localforage.getItem("epube.cache-timestamp").then(function(stamp) {
@@ -21,6 +22,7 @@ function cache_refresh(force) {
 	return false;
 }
 
+/* exported toggle_fav */
 function toggle_fav(elem) {
 	const bookId = elem.getAttribute("data-book-id");
 
@@ -38,6 +40,7 @@ function toggle_fav(elem) {
 
 				$(elem).html(msg).attr('data-is-fav', data.status);
 
+				/* global index_mode */
 				if (index_mode == "favorites" && data.status == 0) {
 					$("#cell-" + bookId).remove();
 				}
@@ -48,6 +51,7 @@ function toggle_fav(elem) {
 	return false;
 }
 
+/* global offline_remove */
 function mark_offline(elem) {
 
 	const bookId = elem.getAttribute("data-book-id");
@@ -78,6 +82,7 @@ function mark_offline(elem) {
 	});
 }
 
+/* exported mark_offline_books */
 function mark_offline_books() {
 	const elems = $(".offline_dropitem");
 
@@ -159,6 +164,7 @@ function offline_cache(bookId, callback) {
 	});
 }
 
+/* exported show_summary */
 function show_summary(elem) {
 	const id = elem.getAttribute("data-book-id");
 
@@ -176,6 +182,7 @@ function show_summary(elem) {
 	return false;
 }
 
+/* exported offline_get_all */
 function offline_get_all() {
 
 	if (confirm("Download all books on this page?")) {
diff --git a/js/offline.js b/js/offline.js
index 6fd3ddd..4f9a13a 100644
--- a/js/offline.js
+++ b/js/offline.js
@@ -2,6 +2,7 @@
 
 /* global localforage, Holder */
 
+/* exported offline_search */
 function offline_search() {
 	const query = $(".search_query").val();
 
@@ -12,14 +13,17 @@ function offline_search() {
 	return false;
 }
 
+/* exported offline_remove2 */
 function offline_remove2(elem) {
 	const bookId = elem.getAttribute("data-book-id");
 
+	/* global offline_remove */
 	return offline_remove(bookId, function() {
 		$("#cell-" + bookId).remove();
 	});
 }
 
+/* exported offline_clear */
 function offline_clear() {
 
 	if (confirm("Remove all offline data?")) {
@@ -151,6 +155,7 @@ function populate_list() {
 
 }
 
+/* exported show_summary */
 function show_summary(elem) {
 	const bookId = elem.getAttribute("data-book-id");
 
diff --git a/js/read.js b/js/read.js
index f82fc8d..04d2c15 100644
--- a/js/read.js
+++ b/js/read.js
@@ -1,7 +1,630 @@
 'use strict';
 
-/* global localforage, book, cacheId */
+/* globals ePub, localforage, book, cacheId */
 
+let _pagination_stored = 0;
+let _last_position_sync = 0;
+let _store_position = 0;
+
+//const _is_ios = (/iPad|iPhone|iPod/).test(navigator.userAgent) && !window.MSStream;
+const _res_data = [];
+
+const DEFAULT_FONT_SIZE = 16;
+const DEFAULT_FONT_FAMILY = "Georgia";
+const DEFAULT_LINE_HEIGHT = 140;
+
+function cacheId(suffix) {
+	return "epube-book." + $.urlParam("b") + (suffix ? "." + suffix : "");
+}
+
+function init_loader() {
+	// we need to preload resources for reader iframe because it can't utilize our
+	// service worker because while offline it is created outside our base server context
+	const res_names = [ "lib/bootstrap/v3/js/jquery.js", "lib/jquery.mobile.custom.js",
+		"css/transitions.css",
+		"js/reader.js", "css/reader.css", "js/dict.js",
+		"themes/default.css", "themes/mocca.css", "themes/night.css",
+		"themes/plan9.css", "themes/gray.css" ];
+
+	for (let i = 0; i < res_names.length; i++) {
+		fetch(res_names[i], {credentials: 'same-origin'}).then(function(resp) {
+			if (resp.status == 200) {
+				resp.text().then(function(data) {
+					const url = new URL(resp.url);
+					url.searchParams.delete("ts");
+
+					_res_data[url.toString()] = data;
+				})
+			} else {
+				console.warn('loader failed for resource', res_names[i], resp);
+			}
+		});
+	}
+
+	check_resource_load(res_names, _res_data, 0);
+}
+
+function check_resource_load(res_names, res_data, attempt) {
+	console.log("check_resource_load", attempt, res_names.length, Object.keys(res_data).length);
+
+	if (attempt == 5) {
+		$(".loading_message").html("Unable to load resources.");
+		return;
+	}
+
+	if (res_names.length != Object.keys(res_data).length) {
+		window.setTimeout(function() {
+			check_resource_load(res_names, res_data, attempt+1);
+		}, 250);
+	} else {
+		init_reader();
+	}
+}
+
+function init_reader() {
+	apply_theme();
+
+	$(window).on('online', function() {
+		console.log("we're online, storing lastread");
+
+		const currentCfi = book.rendition.currentLocation().start.cfi;
+		const currentPage = parseInt(book.locations.percentageFromCfi(currentCfi) * 100);
+
+		$.post("backend.php", { op: "storelastread", id: $.urlParam("id"), page: currentPage,
+			cfi: currentCfi }, function(data) {
+
+				if (data.cfi) {
+					_last_position_sync = new Date().getTime()/1000;
+				}
+			})
+			.fail(function(e) {
+				if (e && e.status == 401) {
+					window.location = "index.php";
+				}
+			});
+	});
+
+	localforage.getItem(cacheId("book")).then(function(item) {
+
+		// ios doesn't work with FileReader for whatever reason
+		if (/*!_is_ios &&*/ item) {
+
+			console.log("loading from local storage");
+
+			const fileReader = new FileReader();
+
+			fileReader.onload = function() {
+				try {
+					book.open(this.result);
+				} catch (e) {
+					$(".loading_message").html("Unable to load book (local).");
+					console.log(e);
+				}
+			};
+
+			fileReader.readAsArrayBuffer(item);
+
+		} else {
+
+			console.log("loading from network");
+
+			if (navigator.onLine) {
+				const book_url = "backend.php?op=download&id=" + $.urlParam("id");
+
+				$(".loading_message").html("Downloading...");
+
+				fetch(book_url, {credentials: 'same-origin'}).then(function(resp) {
+
+					if (resp.status == 200) {
+						const bookId = $.urlParam("b");
+
+						// let's store this for later
+						localforage.setItem(cacheId('book'), resp.clone().blob());
+
+						// if there's no base information cached yet, let's do that too
+						localforage.getItem(cacheId()).then(function(info) {
+							if (!info) {
+								$.post("backend.php", {op: "getinfo", id: bookId }, function(data) {
+									if (data) {
+										localforage.setItem(cacheId(), data);
+
+										if (data.has_cover) {
+											fetch("backend.php?op=cover&id=" + bookId, {credentials: 'same-origin'}).then(function(resp) {
+												if (resp.status == 200) {
+													localforage.setItem(cacheId('cover'), resp.blob());
+												}
+											});
+										}
+									}
+								});
+							}
+						});
+
+						resp.blob().then(function(blob) {
+
+							const fileReader = new FileReader();
+
+							fileReader.onload = function() {
+								book.open(this.result);
+							};
+
+							fileReader.readAsArrayBuffer(blob);
+
+						});
+					} else {
+						$(".loading_message").html("Unable to download book: " + resp.status + ".");
+					}
+				}).catch(function(err) {
+					console.warn(err);
+
+					if ($(".loading").is(":visible")) {
+						$(".loading_message").html("Unable to load book (remote).");
+					}
+				});
+
+			} else {
+				$(".loading_message").html("This book is not available offline.");
+			}
+		}
+	});
+
+	const book = ePub();
+	window.book = book;
+
+	const rendition = book.renderTo("reader", {
+		width: '100%',
+		height: '100%',
+		minSpreadWidth: 961
+	});
+
+	const displayed = rendition.display();
+
+	// this sets default theme, then we apply CSS to already rendered content
+	// with apply_styles()
+	displayed.then(function () {
+
+		let fontSize;
+		let fontFamily;
+		let lineHeight;
+		//let themeName;
+
+		Promise.all([
+			localforage.getItem("epube.fontSize"),
+			localforage.getItem("epube.fontFamily"),
+			localforage.getItem("epube.lineHeight"),
+			localforage.getItem("epube.theme")
+		]).then(function(res) {
+			fontSize = res[0] ? res[0] + "px" : DEFAULT_FONT_SIZE + "px";
+			fontFamily = res[1] ? res[1] : DEFAULT_FONT_FAMILY;
+			lineHeight = res[2] ? res[2] + "%" : DEFAULT_LINE_HEIGHT + "%";
+			//themeName = res[3] ? res[3] : 'default';
+
+			rendition.themes.default({
+				html: {
+					'font-size': fontSize,
+					'font-family': fontFamily,
+					'line-height': lineHeight,
+					'text-align': 'justify'
+				}
+			});
+
+		});
+	});
+
+	rendition.hooks.content.register(function(contents) {
+
+		contents.on("linkClicked", function(href) {
+			console.log('linkClicked', href);
+
+			if (href.indexOf("://") == -1) {
+				$(".prev_location_btn")
+					.attr("data-location-cfi", book.rendition.currentLocation().start.cfi)
+					.show();
+
+				window.setTimeout(function() {
+					show_ui(true);
+				}, 50);
+			}
+
+		});
+
+		const base_url = window.location.href.match(/^.*\//)[0];
+		const res_names = [ "lib/bootstrap/v3/js/jquery.js", "lib/jquery.mobile.custom.js",
+			"js/reader.js", "js/dict.js" ];
+		const doc = contents.document;
+
+		for (let i = 0; i < res_names.length; i++) {
+
+			// we need to create script element with proper context, that is inside the iframe
+			const elem = doc.createElement("script");
+			elem.type = 'text/javascript';
+			elem.text = _res_data[base_url + res_names[i]];
+
+			doc.head.appendChild(elem);
+		}
+
+		$(contents.document.head)
+			.append($("<style type='text/css'>")
+			.text(_res_data[base_url + 'css/reader.css']));
+
+		return localforage.getItem("epube.theme").then(function(theme) {
+			if (!theme) theme = 'default';
+
+			const theme_url = base_url + 'themes/' + theme + '.css';
+
+			$(contents.document.head)
+				.append($("<style type='text/css' id='theme_css'>")
+				.text(_res_data[theme_url]));
+		});
+
+	});
+
+	$('#settings-modal').on('shown.bs.modal', function() {
+
+		localforage.getItem(cacheId("lastread")).then((item) => {
+			if (item && item.cfi) {
+				$(".lastread_input").val(item.page + '%');
+			}
+
+			$.post("backend.php", { op: "getlastread", id: $.urlParam("id") }, function(data) {
+				$(".lastread_input").val(data.page + '%');
+			});
+
+		});
+
+		localforage.getItem("epube.keep-ui-visible").then(function(keep) {
+			$(".keep_ui_checkbox")
+				.attr("checked", keep)
+				.on("click", function(elem) {
+					localforage.setItem("epube.keep-ui-visible", elem.checked);
+				});
+		});
+
+		localforage.getItem("epube.fontFamily").then(function(font) {
+			if (!font) font = DEFAULT_FONT_FAMILY;
+
+			$(".font_family").val(font);
+		});
+
+		localforage.getItem("epube.theme").then(function(theme) {
+			$(".theme_name").val(theme);
+		});
+
+		localforage.getItem("epube.fontSize").then(function(size) {
+
+			if (!size) size = DEFAULT_FONT_SIZE;
+
+			const zoom = $(".font_size").html("");
+
+			for (let i = 10; i <= 32; i++) {
+				const opt = $("<option>").val(i).html(i + " px");
+				zoom.append(opt);
+			}
+
+			zoom.val(size);
+
+		});
+
+		localforage.getItem("epube.lineHeight").then(function(height) {
+
+			if (!height) height = DEFAULT_LINE_HEIGHT;
+
+			const zoom = $(".line_height").html("");
+
+			for (let i = 100; i <= 220; i += 10) {
+				const opt = $("<option>").val(i).html(i + "%");
+				zoom.append(opt);
+			}
+
+			zoom.val(height);
+
+		});
+	});
+
+	$('#dict-modal').on('shown.bs.modal', function() {
+		$(".dict_result").scrollTop(0);
+	})
+
+	$(".dict_search_btn").on("click", function() {
+		$("#dict-modal").modal('hide');
+		window.open("https://google.com/search?q=" + $(".dict_query").val());
+	});
+
+	function toc_loc_msg(href) {
+		try {
+			const cfiBase = book.spine.get(href).cfiBase;
+
+			const loc = book.locations._locations.find(function(k) {
+				return k.indexOf(cfiBase) != -1
+				});
+
+			return window.book.locations.locationFromCfi(loc);
+
+		} catch (e) {
+			console.warn(e);
+		}
+
+		return "";
+	}
+
+	function process_toc_sublist(row, list, nest) {
+
+		if (nest == 3) return false;
+
+		if (row.subitems) {
+
+			const sublist = $("<ul class='toc_sublist list-unstyled'>");
+
+			$.each(row.subitems, function(i, row) {
+
+				const a = $("<a>")
+					.attr('href', '#')
+					.html("<b class='pull-right'>" + toc_loc_msg(row.href) + "</b>" + row.label)
+					.attr('data-href', row.href)
+					.click(function() {
+						book.rendition.display(a.attr('data-href'));
+					});
+
+				sublist.append($("<li>").append(a));
+
+				process_toc_sublist(row, sublist, nest + 1);
+
+			});
+
+			list.append(sublist);
+		}
+	}
+
+	$('#toc-modal').on('shown.bs.modal', function() {
+
+		const toc = book.navigation.toc;
+
+		const list = $(".toc_list");
+		list.html("");
+
+		$.each(toc, function(i, row) {
+
+			// if anything fails here the toc entry is likely useless anyway (i.e. no cfi)
+			try {
+				const a = $("<a>")
+					.attr('href', '#')
+					.html("<b class='pull-right'>" + toc_loc_msg(row.href) + "</b>" + row.label)
+					.attr('data-href', row.href)
+					.click(function() {
+						book.rendition.display(a.attr('data-href'));
+					});
+
+				list.append($("<li>").append(a));
+
+				process_toc_sublist(row, list, 0);
+
+			} catch (e) {
+				console.warn(e);
+			}
+		});
+
+		// well the toc didn't work out, might as well generate one
+		if (list.children().length <= 1) {
+
+			list.html("");
+
+			$.each(book.spine.items, function (i, row) {
+
+				const a = $("<a>")
+					.attr('href', '#')
+					.attr('title', row.url)
+					.html("Section " + (i+1))
+					.attr('data-href', row.href)
+					.click(function() {
+						book.rendition.display(a.attr('data-href'));
+					});
+
+				list.append($("<li>").append(a));
+
+			});
+		}
+
+	});
+
+	book.ready.then(function() {
+
+		const meta = book.package.metadata;
+
+		document.title = meta.title + " – " + meta.creator;
+		$(".title").html("<b>" + meta.title + "</b> - " + meta.creator);
+
+		return localforage.getItem(cacheId("locations")).then(function(locations) {
+
+			console.log('stored pagination', locations != null);
+
+			// legacy format is array of objects {cfi: ..., page: ...}
+			if (locations && typeof locations[0] == "string") {
+				_pagination_stored = 1;
+				return book.locations.load(locations);
+			} else {
+				console.log("requesting pagination...");
+
+				const url = "backend.php?op=getpagination&id=" + encodeURIComponent($.urlParam("id"));
+
+				return fetch(url, {credentials:'same-origin'}).then(function(resp) {
+
+					if (resp.ok) {
+						return resp.json().then(function(locations) {
+							if (locations && typeof locations[0] == "string") {
+								_pagination_stored = 1;
+								return book.locations.load(locations);
+							} else {
+								$(".loading_message").html("Paginating...");
+								return book.locations.generate(1600);
+							}
+						});
+					} else {
+						$(".loading_message").html("Paginating...");
+						return book.locations.generate(1600);
+					}
+				}).catch(function() {
+					$(".loading_message").html("Paginating...");
+					return book.locations.generate(1600);
+				});
+			}
+
+		});
+
+	}).then(function(locations) {
+
+		console.log("locations ready, stored=", _pagination_stored);
+
+		if (locations) {
+			if (navigator.onLine && !_pagination_stored) {
+				$.post("backend.php", { op: "storepagination", id: $.urlParam("id"),
+					payload: JSON.stringify(locations), total: 100});
+			}
+
+			// store if needed
+			localforage.getItem(cacheId("locations")).then(function(item) {
+				if (!item) localforage.setItem(cacheId("locations"), locations);
+			});
+
+		} else {
+			$(".loading_message").html("Pagination failed.");
+			return;
+		}
+
+		$(".location").click(function() {
+			const current = book.rendition.currentLocation().start.location;
+			const total = book.locations.length();
+
+			const page = prompt("Jump to location [1-" + total + "]", current);
+
+			if (page) {
+				book.rendition.display(book.locations._locations[page]);
+			}
+		});
+
+		open_lastread();
+
+		window.setTimeout(function() {
+			open_lastread();
+
+			$(".loading").hide();
+		}, 250);
+	});
+
+	rendition.on("keyup", hotkey_handler);
+
+	rendition.on('resized', function() {
+		console.log('resized');
+
+		$(".loading").show();
+		$(".loading_message").html("Opening chapter...");
+
+		window.setTimeout(function() {
+			open_lastread();
+
+			$(".loading").hide();
+		}, 250);
+	});
+
+	rendition.on('rendered', function(/*chapter*/) {
+		$(".chapter").html($("<span>").addClass("glyphicon glyphicon-th-list"));
+
+		resize_side_columns();
+
+		try {
+			const location = book.rendition.currentLocation();
+
+			if (location.start) {
+				const cur_href = book.canonical(location.start.href);
+				let toc_entry = false;
+
+				/* eslint-disable no-inner-declarations */
+				function iterate_sublist(row, nest) {
+					if (nest == 2) return false;
+
+					if (row.subitems) {
+						$.each(row.subitems, function (i, r) {
+
+							if (book.spine.get(r.href).canonical == cur_href) {
+								toc_entry = r;
+								return true;
+							}
+
+							if (iterate_sublist(r, nest + 0))
+								return true;
+						});
+					}
+
+					return false;
+				}
+				/* eslint-enable no-inne-declarations */
+
+				$.each(book.navigation.toc, function(i, a) {
+					if (book.spine.get(a.href).canonical == cur_href) {
+						toc_entry = a;
+						return;
+					}
+
+					if (iterate_sublist(a, 0)) return;
+
+				});
+
+				if (toc_entry && toc_entry.label.trim())
+					$(".chapter").append("&nbsp;" + toc_entry.label);
+			}
+
+		} catch (e) {
+			console.warn(e);
+		}
+	});
+
+	rendition.on('relocated', function(location) {
+
+		// locations not generated yet
+		if (book.locations.length() == 0)
+			return;
+
+		const currentCfi = location.start.cfi;
+		const currentPage = parseInt(book.locations.percentageFromCfi(currentCfi) * 100);
+		const pct = book.locations.percentageFromCfi(currentCfi);
+
+		$("#cur_page").html(location.start.location);
+		$("#total_pages").html(book.locations.length());
+
+		$("#page_pct").html(parseInt(pct*100) + '%');
+
+		if (_store_position && new Date().getTime()/1000 - _last_position_sync > 15) {
+			console.log("storing lastread", currentPage, currentCfi);
+
+			if (navigator.onLine) {
+
+				$.post("backend.php", { op: "storelastread", id: $.urlParam("id"), page: currentPage,
+					cfi: currentCfi }, function(data) {
+
+					if (data.cfi) {
+						_last_position_sync = new Date().getTime()/1000;
+					}
+
+				})
+				.fail(function(e) {
+					if (e && e.status == 401) {
+						window.location = "index.php";
+					}
+				});
+
+				_store_position = 0;
+			} else {
+				_last_position_sync = 0;
+			}
+
+			localforage.setItem(cacheId("lastread"),
+				{cfi: currentCfi, page: currentPage, total: 100});
+
+		}
+	});
+
+}
+
+/* exported toggle_fullscreen */
 function toggle_fullscreen() {
 	const element = document.documentElement;
 	const isFullscreen = document.webkitIsFullScreen || document.mozFullScreen || false;
@@ -22,6 +645,7 @@ function show_ui(show) {
 		$(".header,.footer").fadeOut();
 }
 
+/* exported toggle_ui */
 function toggle_ui() {
 	if ($(".header").is(":visible"))
 		$(".header,.footer").fadeOut();
@@ -137,6 +761,18 @@ function resize_side_columns() {
 }
 
 $(document).ready(function() {
+	if ('serviceWorker' in navigator) {
+		navigator.serviceWorker
+        .register('worker.js')
+        .then(function() {
+				console.log("service worker registered");
+
+				init_loader();
+			});
+	} else {
+		alert("Service worker support missing in browser (are you using plain HTTP?).");
+	}
+
 	$(document).on("keyup", function(e) {
 		hotkey_handler(e);
 	});
@@ -148,9 +784,9 @@ $(document).ready(function() {
 	$("#right").on("mouseup", function() {
 		next_page();
 	});
-
 });
 
+/* exported apply_line_height */
 function apply_line_height(elem) {
 	const height = $(elem).val();
 
@@ -159,6 +795,7 @@ function apply_line_height(elem) {
 	});
 }
 
+/* exported apply_font */
 function apply_font(elem) {
 	const font = $(elem).val();
 
@@ -168,6 +805,7 @@ function apply_font(elem) {
 
 }
 
+/* exported apply_font_size */
 function apply_font_size(elem) {
 	const size = $(elem).val();
 
@@ -200,6 +838,7 @@ function apply_styles() {
 
 }
 
+/* exported clear_lastread */
 function clear_lastread() {
 	if (confirm("Clear stored last read location?")) {
 		const total = window.book.locations.length();
@@ -216,6 +855,7 @@ function clear_lastread() {
 	}
 }
 
+/* exported mark_as_read */
 function mark_as_read() {
 	if (confirm("Mark book as read?")) {
 		const total = 100;
@@ -233,6 +873,7 @@ function mark_as_read() {
 	}
 }
 
+/* exported save_and_close */
 function save_and_close() {
 	const location = window.book.rendition.currentLocation();
 
@@ -256,6 +897,7 @@ function save_and_close() {
 	}
 }
 
+/* exported change_theme */
 function change_theme(elem) {
 	const theme = $(elem).val();
 
@@ -282,6 +924,7 @@ function apply_theme() {
 	});
 }
 
+/* exported search */
 function search() {
 	const query = $(".search_input").val();
 	const list = $(".search_results");
@@ -315,6 +958,7 @@ function search() {
 	}
 }
 
+/* exported dict_lookup */
 function dict_lookup(word, callback) {
 	$.post("backend.php", {op: 'define', word: word}, function(data) {
 		if (data) {
@@ -328,6 +972,7 @@ function dict_lookup(word, callback) {
 	});
 }
 
+/* exported open_previous_location */
 function open_previous_location(elem) {
 	const cfi = $(elem).attr("data-location-cfi");
 
diff --git a/read.html b/read.html
index 1ce7f7b..10b5497 100644
--- a/read.html
+++ b/read.html
@@ -233,650 +233,5 @@
 </div>
 </div>
 
-<script type='text/javascript'>
-	'use strict';
-
-	let _pagination_stored = 0;
-	let _last_position_sync = 0;
-	let _store_position = 0;
-	let _is_ios = /iPad|iPhone|iPod/.test(navigator.userAgent) && !window.MSStream;
-	let _res_data = [];
-
-	const DEFAULT_FONT_SIZE = 16;
-	const DEFAULT_FONT_FAMILY = "Georgia";
-	const DEFAULT_LINE_HEIGHT = 140;
-
-	function cacheId(suffix) {
-		return "epube-book." + $.urlParam("b") + (suffix ? "." + suffix : "");
-	}
-
-	$(document).ready(function() {
-		if ('serviceWorker' in navigator) {
- 			 navigator.serviceWorker
-           .register('worker.js')
-           .then(function() {
-					console.log("service worker registered");
-
-					init_loader();
-				});
-		} else {
-			alert("Service worker support missing in browser (are you using plain HTTP?).");
-		}
-	});
-
-	function init_loader() {
-		// we need to preload resources for reader iframe because it can't utilize our
-		// service worker because while offline it is created outside our base server context
-		var res_names = [ "lib/bootstrap/v3/js/jquery.js", "lib/jquery.mobile.custom.js",
-			"css/transitions.css",
-			"js/reader.js", "css/reader.css", "js/dict.js",
-			"themes/default.css", "themes/mocca.css", "themes/night.css",
-			"themes/plan9.css", "themes/gray.css" ];
-
-		for (var i = 0; i < res_names.length; i++) {
-			fetch(res_names[i], {credentials: 'same-origin'}).then(function(resp) {
-				if (resp.status == 200) {
-					resp.text().then(function(data) {
-						var url = new URL(resp.url);
-						url.searchParams.delete("ts");
-
-						_res_data[url.toString()] = data;
-					})
-				} else {
-					console.warn('loader failed for resource', res_names[i], resp);
-				}
-			});
-		}
-
-		check_resource_load(res_names, _res_data, 0);
-	}
-
-	function check_resource_load(res_names, res_data, attempt) {
-		console.log("check_resource_load", attempt, res_names.length, Object.keys(res_data).length);
-
-		if (attempt == 5) {
-			$(".loading_message").html("Unable to load resources.");
-			return;
-		}
-
-		if (res_names.length != Object.keys(res_data).length) {
-			window.setTimeout(function() {
-				check_resource_load(res_names, res_data, attempt+1);
-			}, 250);
-		} else {
-			init_reader();
-		}
-	}
-
-	function init_reader() {
-		apply_theme();
-
-		$(window).on('online', function() {
-			console.log("we're online, storing lastread");
-
-			var currentCfi = book.rendition.currentLocation().start.cfi;
-			var currentPage = parseInt(book.locations.percentageFromCfi(currentCfi) * 100);
-
-			$.post("backend.php", { op: "storelastread", id: $.urlParam("id"), page: currentPage,
-				cfi: currentCfi }, function(data) {
-
-					if (data.cfi) {
-						_last_position_sync = new Date().getTime()/1000;
-					}
-				})
-				.fail(function(e) {
-					if (e && e.status == 401) {
-						window.location = "index.php";
-					}
-				});
-		});
-
-		localforage.getItem(cacheId("book")).then(function(item) {
-
-			// ios doesn't work with FileReader for whatever reason
-			if (/*!_is_ios &&*/ item) {
-
-				console.log("loading from local storage");
-
-				var fileReader = new FileReader();
-
-				fileReader.onload = function(evt) {
-					try {
-						book.open(this.result);
-					} catch (e) {
-						$(".loading_message").html("Unable to load book (local).");
-						console.log(e);
-					}
-				};
-
-				fileReader.readAsArrayBuffer(item);
-
-			} else {
-
-				console.log("loading from network");
-
-				if (navigator.onLine) {
-					var book_url = "backend.php?op=download&id=" + $.urlParam("id");
-
-					$(".loading_message").html("Downloading...");
-
-					fetch(book_url, {credentials: 'same-origin'}).then(function(resp) {
-
-						if (resp.status == 200) {
-							var bookId = $.urlParam("b");
-
-							// let's store this for later
-							localforage.setItem(cacheId('book'), resp.clone().blob());
-
-							// if there's no base information cached yet, let's do that too
-							localforage.getItem(cacheId()).then(function(info) {
-								if (!info) {
-									$.post("backend.php", {op: "getinfo", id: bookId }, function(data) {
-										if (data) {
-											localforage.setItem(cacheId(), data);
-
-											if (data.has_cover) {
-												fetch("backend.php?op=cover&id=" + bookId, {credentials: 'same-origin'}).then(function(resp) {
-													if (resp.status == 200) {
-														localforage.setItem(cacheId('cover'), resp.blob());
-													}
-												});
-											}
-										}
-									});
-								}
-							});
-
-							resp.blob().then(function(blob) {
-
-								var fileReader = new FileReader();
-
-								fileReader.onload = function() {
-									book.open(this.result);
-								};
-
-								fileReader.readAsArrayBuffer(blob);
-
-							});
-						} else {
-							$(".loading_message").html("Unable to download book: " + resp.status + ".");
-						}
-					}).catch(function(err) {
-						console.warn(err);
-
-						if ($(".loading").is(":visible")) {
-							$(".loading_message").html("Unable to load book (remote).");
-						}
-					});
-
-				} else {
-					$(".loading_message").html("This book is not available offline.");
-				}
-			}
-		});
-
-		var book = ePub();
-
-		window.book = book;
-
-		var rendition = book.renderTo("reader", {
-			width: '100%',
-			height: '100%',
-			minSpreadWidth: 961
-		});
-
-		var displayed = rendition.display();
-
-		var fontSize;
-		var fontFamily;
-		var lineHeight;
-		var themeName;
-
-		Promise.all([
-			localforage.getItem("epube.fontSize"),
-			localforage.getItem("epube.fontFamily"),
-			localforage.getItem("epube.lineHeight"),
-			localforage.getItem("epube.theme")
-		]).then(function(res) {
-			fontSize = res[0] ? res[0] + "px" : DEFAULT_FONT_SIZE + "px";
-			fontFamily = res[1] ? res[1] : DEFAULT_FONT_FAMILY;
-			lineHeight = res[2] ? res[2] + "%" : DEFAULT_LINE_HEIGHT + "%";
-			themeName = res[3] ? res[3] : 'default';
-
-			rendition.themes.default({
-				html: {
-					'font-size': fontSize,
-					'font-family': fontFamily,
-					'line-height': lineHeight,
-					'text-align': 'justify'
-				}
-			});
-
-		});
-
-		rendition.hooks.content.register(function(contents) {
-
-			contents.on("linkClicked", function(href) {
-				console.log('linkClicked', href);
-
-				if (href.indexOf("://") == -1) {
-					$(".prev_location_btn")
-						.attr("data-location-cfi", book.rendition.currentLocation().start.cfi)
-						.show();
-
-					window.setTimeout(function() {
-						show_ui(true);
-					}, 50);
-				}
-
-			});
-
-			var base_url = window.location.href.match(/^.*\//)[0];
-			var res_names = [ "lib/bootstrap/v3/js/jquery.js", "lib/jquery.mobile.custom.js",
-				"js/reader.js", "js/dict.js" ];
-			var doc = contents.document;
-
-			for (var i = 0; i < res_names.length; i++) {
-
-				// we need to create script element with proper context, that is inside the iframe
-				var elem = doc.createElement("script");
-				elem.type = 'text/javascript';
-				elem.text = _res_data[base_url + res_names[i]];
-
-				doc.head.appendChild(elem);
-			}
-
-			$(contents.document.head)
-				.append($("<style type='text/css'>")
-				.text(_res_data[base_url + 'css/reader.css']));
-
-			/*localforage.getItem("epube.disable-transitions").then(function(notransitions) {
-				if (!notransitions) {
-					$(contents.document.head)
-						.append($("<style type='text/css'>")
-						.text(_res_data[base_url + 'css/transitions.css']));
-
-					// TODO: fix transitions somehow
-
-					EPUBJS.Render.Iframe.prototype.setLeft = function(leftPos){
-			 			this.docEl.style[this.transform] = 'translate('+ (-leftPos) + 'px, 0)';
-					}
-				}
-			}); */
-
-			return localforage.getItem("epube.theme").then(function(theme) {
-
-				if (!theme) theme = 'default';
-
-				var theme_url = base_url + 'themes/' + theme + '.css';
-
-				$(contents.document.head)
-					.append($("<style type='text/css' id='theme_css'>")
-					.text(_res_data[theme_url]));
-			});
-
-		});
-
-		$('#settings-modal').on('shown.bs.modal', function() {
-
-			localforage.getItem(cacheId("lastread")).then((item) => {
-				if (item && item.cfi) {
-					$(".lastread_input").val(item.page + '%');
-				}
-
-				$.post("backend.php", { op: "getlastread", id: $.urlParam("id") }, function(data) {
-					$(".lastread_input").val(data.page + '%');
-				});
-
-			});
-
-			/*localforage.getItem("epube.disable-transitions").then(function(disable) {
-				$(".transition_checkbox")
-					.attr("checked", disable)
-					.on("click", function() {
-						localforage.setItem("epube.disable-transitions", this.checked);
-					});
-			});*/
-
-			localforage.getItem("epube.keep-ui-visible").then(function(keep) {
-				$(".keep_ui_checkbox")
-					.attr("checked", keep)
-					.on("click", function() {
-						localforage.setItem("epube.keep-ui-visible", this.checked);
-					});
-			});
-
-			localforage.getItem("epube.fontFamily").then(function(font) {
-				if (!font) font = DEFAULT_FONT_FAMILY;
-
-				$(".font_family").val(font);
-			});
-
-			localforage.getItem("epube.theme").then(function(theme) {
-				$(".theme_name").val(theme);
-			});
-
-			localforage.getItem("epube.fontSize").then(function(size) {
-
-				if (!size) size = DEFAULT_FONT_SIZE;
-
-				var zoom = $(".font_size").html("");
-
-				for (var i = 10; i <= 32; i++) {
-					var opt = $("<option>").val(i).html(i + " px");
-
-					if (i == size) opt.attr("selected", "1");
-
-					zoom.append(opt);
-				}
-
-			});
-
-			localforage.getItem("epube.lineHeight").then(function(height) {
-
-				if (!height) height = DEFAULT_LINE_HEIGHT;
-
-				var zoom = $(".line_height").html("");
-
-				for (var i = 100; i <= 220; i += 10) {
-					var opt = $("<option>").val(i).html(i + "%");
-
-					if (i == height) opt.attr("selected", "1");
-
-					zoom.append(opt);
-				}
-
-			});
-		})
-
-		$('#dict-modal').on('shown.bs.modal', function() {
-			$(".dict_result").scrollTop(0);
-		})
-
-		$(".dict_search_btn").on("click", function() {
-			$("#dict-modal").modal('hide');
-			window.open("https://google.com/search?q=" + $(".dict_query").val());
-		});
-
-		$('#toc-modal').on('shown.bs.modal', function() {
-			function toc_loc_msg(href) {
-				try {
-					var cfiBase = book.spine.get(href).cfiBase;
-
-					var loc = book.locations._locations.find(function(k) {
-						return k.indexOf(cfiBase) != -1
-						});
-
-					return window.book.locations.locationFromCfi(loc);
-
-				} catch (e) {
-					console.warn(e);
-				}
-
-				return "";
-			}
-
-			function process_toc_sublist(row, list, nest) {
-
-				if (nest == 3) return false;
-
-				if (row.subitems) {
-
-					var sublist = $("<ul class='toc_sublist list-unstyled'>");
-
-					$.each(row.subitems, function(i, row) {
-
-						var a = $("<a>")
-							.attr('href', '#')
-							.html("<b class='pull-right'>" + toc_loc_msg(row.href) + "</b>" + row.label)
-							.attr('data-href', row.href)
-							.click(function() {
-								book.rendition.display(a.attr('data-href'));
-							});
-
-						sublist.append($("<li>").append(a));
-
-						process_toc_sublist(row, sublist, nest + 1);
-
-					});
-
-					list.append(sublist);
-				}
-			}
-
-				var toc = book.navigation.toc;
-
-				var list = $(".toc_list");
-				list.html("");
-
-				$.each(toc, function(i, row) {
-
-					// if anything fails here the toc entry is likely useless anyway (i.e. no cfi)
-					try {
-						var a = $("<a>")
-							.attr('href', '#')
-							.html("<b class='pull-right'>" + toc_loc_msg(row.href) + "</b>" + row.label)
-							.attr('data-href', row.href)
-							.click(function() {
-								book.rendition.display(a.attr('data-href'));
-							});
-
-						list.append($("<li>").append(a));
-
-						process_toc_sublist(row, list, 0);
-
-					} catch (e) {
-						console.warn(e);
-					}
-				});
-
-				// well the toc didn't work out, might as well generate one
-				if (list.children().length <= 1) {
-
-					list.html("");
-
-					$.each(book.spine.items, function (i, row) {
-
-						var a = $("<a>")
-							.attr('href', '#')
-							.attr('title', row.url)
-							.html("Section " + (i+1))
-							.attr('data-href', row.href)
-							.click(function() {
-								book.rendition.display(a.attr('data-href'));
-							});
-
-						list.append($("<li>").append(a));
-
-					});
-				}
-
-			});
-
-		book.ready.then(function() {
-
-			var meta = book.package.metadata;
-
-			document.title = meta.title + " – " + meta.creator;
-			$(".title").html("<b>" + meta.title + "</b> - " + meta.creator);
-
-			return localforage.getItem(cacheId("locations")).then(function(locations) {
-
-				// legacy format is array of objects {cfi: ..., page: ...}
-				if (locations && typeof locations[0] == "string") {
-					_pagination_stored = 1;
-					return book.locations.load(locations);
-				} else {
-					var url = "backend.php?op=getpagination&id=" + encodeURIComponent($.urlParam("id"));
-
-					return fetch(url, {credentials:'same-origin'}).then(function(resp) {
-
-						if (resp.ok) {
-							return resp.json().then(function(locations) {
-								if (locations && typeof locations[0] == "string") {
-									_pagination_stored = 1;
-									return book.locations.load(locations);
-								} else {
-									$(".loading_message").html("Paginating...");
-									return book.locations.generate(1600);
-								}
-							});
-						} else {
-							$(".loading_message").html("Paginating...");
-							return book.locations.generate(1600);
-						}
-					}).catch(function() {
-						$(".loading_message").html("Paginating...");
-						return book.locations.generate(1600);
-					});
-				}
-
-			});
-
-		}).then(function(locations) {
-
-			if (locations && !_pagination_stored) {
-				if (navigator.onLine) {
-					$.post("backend.php", { op: "storepagination", id: $.urlParam("id"),
-						payload: JSON.stringify(locations), total: 100});
-				}
-
-				localforage.setItem(cacheId("locations"), locations);
-
-			}
-
-			$(".location").click(function() {
-				var current = book.rendition.currentLocation().start.location;
-				var total = book.locations.length();
-
-				var page = prompt("Jump to location [1-" + total + "]", current);
-
-				if (page) {
-					book.rendition.display(book.locations._locations[page]);
-				}
-			});
-
-			open_lastread();
-
-			window.setTimeout(function() {
-				open_lastread();
-
-				$(".loading").hide();
-			}, 250);
-		});
-
-		rendition.on("keyup", hotkey_handler);
-
-		rendition.on('resized', function() {
-			console.log('resized');
-
-			$(".loading").show();
-			$(".loading_message").html("Opening chapter...");
-
-			window.setTimeout(function() {
-				open_lastread();
-
-				$(".loading").hide();
-			}, 250);
-		});
-
-		rendition.on('rendered', function(chapter) {
-			$(".chapter").html($("<span>").addClass("glyphicon glyphicon-th-list"));
-
-			resize_side_columns();
-
-			try {
-				var location = book.rendition.currentLocation();
-
-				if (location.start) {
-					var cur_href = book.canonical(location.start.href);
-					var toc_entry = false;
-
-					function iterate_sublist(row, nest) {
-						if (nest == 3) return false;
-
-						if (row.subitems) {
-							$.each(row.subitems, function (i, r) {
-
-								if (book.spine.get(r.href).canonical == cur_href) {
-									toc_entry = r;
-									return true;
-								}
-
-								if (iterate_sublist(r, nest + 1))
-									return true;
-							});
-						}
-
-						return false;
-					}
-
-					$.each(book.navigation.toc, function(i, a) {
-						if (book.spine.get(a.href).canonical == cur_href) {
-							toc_entry = a;
-							return;
-						}
-
-						if (iterate_sublist(a, 0)) return;
-
-					});
-
-					if (toc_entry && toc_entry.label.trim())
-						$(".chapter").append("&nbsp;" + toc_entry.label);
-				}
-
-			} catch (e) {
-				console.warn(e);
-			}
-		});
-
-		rendition.on('relocated', function(location) {
-
-			// locations not generated yet
-			if (book.locations.length() == 0)
-				return;
-
-			var currentCfi = location.start.cfi;
-			var currentPage = parseInt(book.locations.percentageFromCfi(currentCfi) * 100);
-			var pct = book.locations.percentageFromCfi(currentCfi);
-
-			$("#cur_page").html(location.start.location);
-			$("#total_pages").html(book.locations.length());
-
-			$("#page_pct").html(parseInt(pct*100) + '%');
-
-			if (_store_position && new Date().getTime()/1000 - _last_position_sync > 15) {
-				console.log("storing lastread", currentPage, currentCfi);
-
-				if (navigator.onLine) {
-
-					$.post("backend.php", { op: "storelastread", id: $.urlParam("id"), page: currentPage,
-						cfi: currentCfi }, function(data) {
-
-						if (data.cfi) {
-							_last_position_sync = new Date().getTime()/1000;
-						}
-
-					})
-					.fail(function(e) {
-						if (e && e.status == 401) {
-							window.location = "index.php";
-						}
-					});
-
-					_store_position = 0;
-				} else {
-					_last_position_sync = 0;
-				}
-
-				localforage.setItem(cacheId("lastread"),
-					{cfi: currentCfi, page: currentPage, total: 100});
-
-			}
-		});
-
-	}
-</script>
-
 </body>
 </html>
-- 
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