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4get/static/client.js

682 lines
13 KiB
JavaScript

/*
Global functions
*/
function htmlspecialchars(str){
var map = {
'&': '&',
'<': '&lt;',
'>': '&gt;',
'"': '&quot;',
"'": '&#039;'
}
return str.replace(/[&<>"']/g, function(m){return map[m];});
}
function htmlspecialchars_decode(str){
var map = {
'&amp;': '&',
'&lt;': '<',
'&gt;': '>',
'&quot;': '"',
'&#039;': "'"
}
return str.replace(/&amp;|&lt;|&gt;|&quot;|&#039;/g, function(m){return map[m];});
}
function is_click_within(elem, classname, is_id = false){
while(true){
if(elem === null){
return false;
}
if(
(
is_id === false &&
elem.className == classname
) ||
(
is_id === true &&
elem.id == classname
)
){
return elem;
}
elem = elem.parentElement;
}
}
/*
Prevent GET parameter pollution
*/
var form = document.getElementsByTagName("form");
if(
form.length !== 0 &&
window.location.pathname != "/" &&
window.location.pathname != "/settings.php" &&
window.location.pathname != "/settings"
){
form = form[0];
var scraper_dropdown = document.getElementsByName("scraper")[0];
scraper_dropdown.addEventListener("change", function(choice){
submit(form);
});
form.addEventListener("submit", function(e){
e.preventDefault();
submit(e.srcElement);
});
}
function submit(e){
var GET = "";
var first = true;
if((s = document.getElementsByName("s")).length !== 0){
GET += "?s=" + encodeURIComponent(s[0].value).replaceAll("%20", "+");
first = false;
}
Array.from(
e.getElementsByTagName("select")
).concat(
Array.from(
e.getElementsByTagName("input")
)
).forEach(function(el){
var firstelem = el.getElementsByTagName("option");
if(
(
(
firstelem.length === 0 ||
firstelem[0].value != el.value
) &&
el.name != "" &&
el.value != "" &&
el.name != "s"
) ||
el.name == "scraper" ||
el.name == "nsfw"
){
if(first){
GET += "?";
first = false;
}else{
GET += "&";
}
GET += encodeURIComponent(el.name).replaceAll("%20", "+") + "=" + encodeURIComponent(el.value).replaceAll("%20", "+");
}
});
window.location.href = GET;
}
/*
Hide show more button when it's not needed on answers
*/
var answer_div = document.getElementsByClassName("answer");
if(answer_div.length !== 0){
answer_div = Array.from(answer_div);
var spoiler_button_div = Array.from(document.getElementsByClassName("spoiler-button"));
// execute on pageload
hide_show_more();
window.addEventListener("resize", hide_show_more);
function hide_show_more(){
var height = window.innerWidth >= 1000 ? 600 : 200;
for(i=0; i<answer_div.length; i++){
if(answer_div[i].scrollHeight < height){
spoiler_button_div[i].style.display = "none";
document.getElementById(spoiler_button_div[i].htmlFor).checked = true;
}else{
spoiler_button_div[i].style.display = "block";
}
}
}
}
switch(document.location.pathname){
case "/web":
case "/web.php":
var image_class = "image";
break;
case "/images":
case "/images.php":
var image_class = "thumb";
break;
default:
var image_class = null;
}
if(image_class !== null){
/*
Add popup to document
*/
var popup_bg = document.createElement("div");
popup_bg.id = "popup-bg";
document.body.appendChild(popup_bg);
// enable/disable pointer events
if(!document.cookie.includes("bg_noclick=yes")){
popup_bg.style.pointerEvents = "none";
}
var popup_status = document.createElement("div");
popup_status.id = "popup-status";
document.body.appendChild(popup_status);
var popup_body = document.createElement("div");
popup_body.id = "popup";
document.body.appendChild(popup_body);
// import popup
var popup_body = document.getElementById("popup");
var popup_status = document.getElementById("popup-status");
var popup_image = null; // is set later on popup click
// image metadata
var collection = []; // will contain width, height, image URL
var collection_index = 0;
// event handling helper variables
var is_popup_shown = false;
var mouse_down = false;
var mouse_move = false;
var move_x = 0;
var move_y = 0;
var target_is_popup = false;
var mirror_x = false;
var mirror_y = false;
var rotation = 0;
/*
Image dragging (mousedown)
*/
document.addEventListener("mousedown", function(div){
if(div.buttons !== 1){
return;
}
mouse_down = true;
mouse_move = false;
if(is_click_within(div.target, "popup", true) === false){
target_is_popup = false;
}else{
target_is_popup = true;
var pos = popup_body.getBoundingClientRect();
move_x = div.x - pos.x;
move_y = div.y - pos.y;
}
});
/*
Image dragging (mousemove)
*/
document.addEventListener("mousemove", function(pos){
if(
target_is_popup &&
mouse_down
){
mouse_move = true;
movepopup(popup_body, pos.clientX - move_x, pos.clientY - move_y);
}
});
/*
Image dragging (mouseup)
*/
document.addEventListener("mouseup", function(){
mouse_down = false;
});
/*
Image popup open
*/
document.addEventListener("click", function(click){
// should our click trigger image open?
if(
elem = is_click_within(click.target, image_class) ||
click.target.classList.contains("openimg")
){
event.preventDefault();
is_popup_shown = true;
// reset position params
mirror_x = false;
mirror_y = false;
rotation = 0;
scale = 60;
collection_index = 0;
// get popup data
if(elem === true){
// we clicked a simple image preview
elem = click.target;
var image_url = elem.getAttribute("src");
if(image_url.startsWith("/proxy")){
var match = image_url.match(/i=([^&]+)/);
if(match !== null){
image_url = decodeURIComponent(match[1]);
}
}else{
image_url = htmlspecialchars_decode(image_url);
}
collection = [
{
"url": image_url,
"width": Math.round(click.target.naturalWidth),
"height": Math.round(click.target.naturalHeight)
}
];
var title = "No description provided";
if(click.target.title != ""){
title = click.target.title;
}else{
if(click.target.alt != ""){
title = click.target.alt;
}
}
}else{
if(image_class == "thumb"){
// we're inside image.php
elem =
elem
.parentElement
.parentElement;
var image_url = elem.getElementsByTagName("a")[1].href;
}else{
// we're inside web.php
var image_url = elem.href;
}
collection =
JSON.parse(
elem.getAttribute("data-json")
);
var title = elem.title;
}
// prepare HTML
var html =
'<div id="popup-num">(' + collection.length + ')</div>' +
'<div id="popup-dropdown">' +
'<select name="viewer-res" onchange="changeimage(event)">';
for(i=0; i<collection.length; i++){
if(collection[i].url.startsWith("data:")){
var domain = "&lt;Base64 Data&gt;";
}else{
var domain = new URL(collection[i].url).hostname;
}
html += '<option value="' + i + '">' + '(' + collection[i].width + 'x' + collection[i].height + ') ' + domain + '</option>';
}
popup_status.innerHTML =
html + '</select></div>' +
'<a href="' + htmlspecialchars(image_url) + '" rel="noreferrer nofollow "id="popup-title">' + htmlspecialchars(title) + '</a>';
popup_body.innerHTML =
'<img src="' + getproxylink(collection[0].url) + '" draggable="false" id="popup-image">';
// make changes to DOM
popup_body.style.display = "block";
popup_bg.style.display = "block";
popup_status.style.display = "table";
// store for rotation functions & changeimage()
popup_image = document.getElementById("popup-image");
scalepopup(collection[collection_index], scale);
centerpopup();
}else{
// click inside the image viewer
// resize image
if(is_click_within(click.target, "popup", true)){
if(mouse_move === false){
scale = 80;
scalepopup(collection[collection_index], scale);
centerpopup();
}
}else{
if(is_click_within(click.target, "popup-status", true) === false){
// click outside the popup while its open
// close it
if(is_popup_shown){
hidepopup();
}
}
}
}
});
/*
Scale image viewer
*/
popup_body.addEventListener("wheel", function(scroll){
event.preventDefault();
if(
scroll.altKey ||
scroll.ctrlKey ||
scroll.shiftKey
){
var increment = 7;
}else{
var increment = 14;
}
if(scroll.wheelDelta > 0){
// scrolling up
scale = scale + increment;
}else{
// scrolling down
if(scale - increment > 7){
scale = scale - increment;
}
}
// calculate relative size before scroll
var pos = popup_body.getBoundingClientRect();
var x = (scroll.x - pos.x) / pos.width;
var y = (scroll.y - pos.y) / pos.height;
scalepopup(collection[collection_index], scale);
// move popup to % we found
pos = popup_body.getBoundingClientRect();
movepopup(
popup_body,
scroll.clientX - (x * pos.width),
scroll.clientY - (y * pos.height)
);
});
/*
Keyboard controls
*/
document.addEventListener("keydown", function(key){
// close popup
if(
is_popup_shown &&
key.keyCode === 27
){
hidepopup();
return;
}
if(is_popup_shown === false){
return;
}
if(
key.altKey ||
key.ctrlKey ||
key.shiftKey
){
// mirror image
switch(key.keyCode){
case 37:
// left
key.preventDefault();
mirror_x = true;
break;
case 38:
// up
key.preventDefault();
mirror_y = false;
break;
case 39:
// right
key.preventDefault();
mirror_x = false;
break;
case 40:
// down
key.preventDefault();
mirror_y = true;
break;
}
}else{
// rotate image
switch(key.keyCode){
case 37:
// left
key.preventDefault();
rotation = -90;
break;
case 38:
// up
key.preventDefault();
rotation = 0;
break;
case 39:
// right
key.preventDefault();
rotation = 90;
break;
case 40:
// down
key.preventDefault();
rotation = -180;
break;
}
}
popup_image.style.transform =
"scale(" +
(mirror_x ? "-1" : "1") +
", " +
(mirror_y ? "-1" : "1") +
") " +
"rotate(" +
rotation + "deg" +
")";
});
}
function getproxylink(url){
if(url.startsWith("data:")){
return htmlspecialchars(url);
}else{
return '/proxy?i=' + encodeURIComponent(url);
}
}
function hidepopup(){
is_popup_shown = false;
popup_status.style.display = "none";
popup_body.style.display = "none";
popup_bg.style.display = "none";
}
function scalepopup(size, scale){
var ratio =
Math.min(
(window.innerWidth * (scale / 100)) / collection[collection_index].width, (window.innerHeight * (scale / 100)) / collection[collection_index].height
);
popup_body.style.width = size.width * ratio + "px";
popup_body.style.height = size.height * ratio + "px";
}
function centerpopup(){
var size = popup_body.getBoundingClientRect();
var size = {
"width": parseInt(size.width),
"height": parseInt(size.height)
};
movepopup(
popup_body,
(window.innerWidth / 2) - (size.width / 2),
(window.innerHeight / 2) - (size.height / 2)
);
}
function movepopup(popup_body, x, y){
popup_body.style.left = x + "px";
popup_body.style.top = y + "px";
}
function changeimage(event){
// reset rotation params
mirror_x = false;
mirror_y = false;
rotation = 0;
scale = 60;
collection_index = parseInt(event.target.value);
// we set innerHTML otherwise old image lingers a little
popup_body.innerHTML =
'<img src="' + getproxylink(collection[collection_index].url) + '" draggable="false" id="popup-image">';
// store for rotation functions & changeimage()
popup_image = document.getElementById("popup-image");
scalepopup(collection[collection_index], scale);
centerpopup();
}
/*
Shortcuts
*/
var searchbox_wrapper = document.getElementsByClassName("searchbox");
if(searchbox_wrapper.length !== 0){
searchbox_wrapper = searchbox_wrapper[0];
var searchbox = searchbox_wrapper.getElementsByTagName("input")[1];
document.addEventListener("keydown", function(key){
switch(key.keyCode){
case 191:
// 191 = /
if(document.activeElement.tagName == "INPUT"){
// already focused, ignore
break;
}
if(
typeof is_popup_shown != "undefined" &&
is_popup_shown
){
hidepopup();
}
window.scrollTo(0, 0);
searchbox.focus();
key.preventDefault();
break;
}
});
}