// ==UserScript==
// @name Downbooru
// @name:en Downbooru
// @namespace https://greasyfork.org/ja/scripts/29802-downbooru
// @version 2.2
// @description danbooruに画像をダウンロードするボタンを追加する。画像にはタグ(XP Keywords)が付与される。Picasa3と相性抜群。
// @description PNGはExifが無いためJPGに変換。サイズの大きい画像は縮小される。
// @description:en donwloads an image added tags from danbooru
// @author You
// @match http://danbooru.donmai.us$
// @match *://danbooru.donmai.us$
// @match *://danbooru.donmai.us/posts*
// @grant none
// ==/UserScript==
//参考:canvas https://blog.agektmr.com/2013/09/canvas-png-blob.html
//参考:deferred http://hamalog.tumblr.com/post/5159447047/jquerydeferredって何
//参考:http://qiita.com/geek_duck/items/2db28daa9e27df9b861d
//参考:http://qiita.com/zaru/items/878b892e4debf03785e3 JavaScriptやjQueryでイベントを削除して再登録する方法
(function () {
var hb_i = 0;
var lb_j = 0;
setHideButton();
setLargeButton();
function setHideButton() {
var button_parent = $('article[data-id]');
for (; hb_i < button_parent.length; hb_i++) {
var button = $('<button>').text('DL')
.attr({
'data-tags': $(button_parent[hb_i]).attr('data-tags'),
'data-file-url': $(button_parent[hb_i]).attr('data-file-url'),
'data-id': $(button_parent[hb_i]).attr('data-id')
})
.css({
'background-color': '#A85',
'-moz-border-radius': 2,
'-webkit-border-radius': 2,
'border-radius': 2,
'border-style': 'none',
'font-weight': 'bold',
'position': 'absolute',
'right': 0,
'bottom': 0,
'opacity': 0.2,
'width': '2em',
'height': '2em'
});
button.hover(function () {
$(this).css({'opacity': 0.6, 'font-size': '1.214em'});
}, function () {
$(this).css({'opacity': 0.2, 'font-size': '1em'});
});
button[0].addEventListener("click", function () {
var button = $(this);
button[0].removeEventListener("click", arguments.callee, false);
button.unbind('mouseenter').unbind('mouseleave');
button.text('...').css({'opacity': 0.8, 'font-size': '1em'});
var src = button.attr('data-file-url');
var tags = button.attr('data-tags').split(' ');
var file = "danbooru" + button.attr('data-id') + ".jpg";
downloadImageWithTags(src, tags, file).then(function () {
button.text('✖').css({
'background-color': '#FFF',
'color': '#A85',
'border-style': 'solid',
'border-width': 'midium',
'border-color': '#A85'
});
});
}, false);
$(button_parent[hb_i]).append(button);
}
}
function setLargeButton() {
var button_parent = $('section[data-id]');
for (; lb_j < button_parent.length; lb_j++) {
var button = $('<button>').text('Download')
.attr({
'data-tags': $(button_parent[lb_j]).attr('data-tags'),
'data-file-url': $(button_parent[lb_j]).attr('data-file-url'),
'data-id': $(button_parent[lb_j]).attr('data-id')
})
.css({
'background-color': '#A85',
'border-style': 'solid',
'border-width': 'midium',
'border-color': '#000',
'font-weight': 'bold',
'width': 85,
'height': 22
});
button.hover(function () {
$(this).css({'color': '#FFF'});
}, function () {
$(this).css({'color': '#000'});
});
button[0].addEventListener("click", function () {
var button = $(this);
button[0].removeEventListener("click", arguments.callee, false);
button.unbind('mouseenter').unbind('mouseleave');
button.text('.....').css({'color': '#000'});
var src = button.attr('data-file-url');
var tags = button.attr('data-tags').split(' ');
var file = "danbooru" + button.attr('data-id') + ".jpg";
downloadImageWithTags(src, tags, file).then(function () {
button.text('Complete!').css({'background-color': '#FFF', 'color': '#A85', 'border-color': '#A85'});
});
}, false);
$(button_parent[lb_j]).append(button);
}
}
window.onscroll = (function () {
setHideButton();
setLargeButton();
});
function downloadImageWithTags(src, tags, name) {
var dfd = new $.Deferred();
var exif = createExif(tags);
getImgDataurl(src).then(function (dataurl) {
var blob = insertExif(exif, dataurl);
var a = document.createElement('a');
a.href = window.URL.createObjectURL(blob);
a.download = name;
a.click();
dfd.resolve();
});
return dfd.promise();
}
function getImgDataurl(url) {
var dfd = new $.Deferred();
var img = new Image();
img.src = url;
var canvas = document.createElement('canvas');
img.onload = function () {
canvas.setAttribute('width', img.width);
canvas.setAttribute('height', img.height);
var ctx = canvas.getContext('2d');
ctx.drawImage(img, 0, 0);
var jpg_src = canvas.toDataURL('image/jpeg');
if (jpg_src.split(',')[1]) {
dfd.resolve(jpg_src);
} else {
var wid;
var hei;
wid = 850;
hei = 850 * img.height / img.width;
ctx.drawImage(img, 0, 0, img.width, img.height, 0, 0, wid, hei);
jpg_src = canvas.toDataURL('image/jpeg');
dfd.resolve(jpg_src);
}
};
return dfd.promise();
}
function createExif(list) {
var bim = "50686f746f73686f7020332e30003842494d040400000000";
var hex_list = [];
for (var i = 0; i < list.length; i++) {
hex_list[i] = strToHex(list[i]);
}
var tags = "1c021900" + tagLength(hex_list[0]) + hex_list[0] + "1c020000020004";
for (var i = 1; i < hex_list.length; i++) {
tags = tags + "1c021900" + tagLength(hex_list[i]) + hex_list[i];
}
tags = wholeTagLength(tags) + tags;
//XX XX [BIM] [TAGS]
var seg_len = (2 + bim.length / 2 + tags.length / 2).toString(16);
if (seg_len.length > 4) {
console.log("タグのデータ量が限界を超えました");
return;
}
seg_len = "000" + seg_len;
seg_len = seg_len.slice(-4);
var exif = "ffed" + seg_len + bim + tags;
return exif;
}
function insertExif(exif, dataurl) {
var bin = atob(dataurl.split(",")[1]);
var buffer = new Uint8Array(bin.length + exif.length / 2);
for (var i = 0; i < 20; i++) {
buffer[i] = bin.charCodeAt(i);
}
for (var bf_i = 20, ex_j = 0; ex_j < exif.length / 2; bf_i++,
ex_j++) {
buffer[bf_i] = parseInt(exif.slice(ex_j * 2, ex_j * 2 + 2), 16);
}
for (var bf_i = 20 + exif.length / 2, bin_j = 20; bin_j < bin.length; bf_i++,
bin_j++) {
buffer[bf_i] = bin.charCodeAt(bin_j);
}
var blob = new Blob([buffer.buffer], {
type: 'image/jpeg'
});
return blob;
}
//引数はhexで
function tagLength(str) {
var len = (str.length / 2).toString(16);
len = ("0" + len).slice(-2);
return len;
}
//引数はhexで
function wholeTagLength(str) {
var len = (str.length / 2).toString(16);
len = ("000" + len).slice(-4);
return len;
}
function strToHex(str) {
var hex = "";
for (var i = 0; i < str.length; i++) {
hex = hex + str.charCodeAt(i).toString(16);
}
return hex;
}
function strToU8(str) {
var buffer = new Uint8Array(str.length);
for (var i = 0; i < buffer.length; i++) {
buffer[i] = str.charCodeAt(i);
}
return buffer;
}
function hexToU8(str) {
var buffer = new Uint8Array(str.length / 2);
for (var i = 0; i < buffer.length; i++) {
buffer[i] = parseInt(str.slice(i * 2, i * 2 + 2), 16);
}
return buffer;
}
//テスト用 16進数文字列をアルファベットに変換する
function hexToChar(str) {
var char = "";
for (var i = 0; i < str.length / 2; i++) {
//4a→74→J
char = char + String.fromCharCode(parseInt(str.slice(i * 2, i * 2 + 2), 16));
}
return char;
}
}
)();
