AutoPager for E-Hentai

Provides AutoPager-like function for E-Hentai.
As of 2014-08-03. See the latest version.
Ask a question, post a review, or report the script.
Wrap lines
// ==UserScript==
// @name            AutoPager for E-Hentai
// @description     Provides AutoPager-like function for E-Hentai.
// @grant           GM_xmlhttpRequest
// @grant           unsafeWindow
// @include         http://g.e-hentai.org/*
// @version 0.0.1.20140803090251
// @namespace https://greasyfork.org/users/2233
// ==/UserScript==

var wnd = window
var doc = wnd.document
var loc = location
var href = loc.href

if(/^http:\/\/g\.e-hentai\.org\//.test(href))
{
    if(!/\/[gs]\//.test(href)){ throw 'exit' }

    var gid = gtoken = ''
    if(/\/g\//.test(href))
    {
        var m = /\/g\/([^\/]+)\/([^\/]+)/.exec(href)
        if(m == null){ alert('Invalid gallery.'); throw 'exit' }
        gid = m[1], gtoken = m[2]
    }
    else if(/\/s\//.test(href))
    {
        var m = /\/s\/([^\/]+)\/([^\/]+)-([0-9]+)/.exec(href)
        if(m == null){ alert('Invalid image page.'); throw 'exit' }
        var imgkey = m[1], gid = m[2], page = m[3]
        if(imgkey.length > 10) { imgkey = imgkey.substring(0, 10) }
        var gtoken = GM_xmlhttpRequest({
            method: 'POST',
            url: 'http://g.e-hentai.org/api.php',
            data: JSON.stringify({'method':'gtoken', 'pagelist':[[gid, imgkey, page]]}),
            synchronous: true,
        })
        gtoken = JSON.parse(gtoken.responseText)['tokenlist'][0]['token']
    }
    if(gid == '' || gtoken == ''){ alert('Cannot find gid or gtoken.'); throw 'exit' }

    var filecount = ''
    filecount = GM_xmlhttpRequest({
        method: 'POST',
        url: 'http://g.e-hentai.org/api.php',
        data: JSON.stringify({'method':'gdata', 'gidlist':[[gid, gtoken]]}),
        synchronous: true,
    })
    filecount = parseInt(JSON.parse(filecount.responseText)['gmetadata'][0]['filecount'])
    if(isNaN(filecount)){ alert('Cannot find file count.'); throw 'exit' }

    if(/\/g\//.test(href))
    {
        var page = imgkey = ''
        page = parseInt(doc.querySelector('#gdt a').href.replace(/^.*-([0-9]+)/, '$1')), page_url = ''
        lnks = doc.getElementsByTagName('A')
        for(var i=lnks.length-1; i>=0; i--)
        {
            if(new RegExp('/s/[^/]+/'+gid+'-'+page+'$').test(lnks[i].href))
            {
                try {
                    page_url = lnks[i].href
                    imgkey = /\/s\/([^\/]+)/.exec(lnks[i].href)[1]
                    if(imgkey.length > 10) { imgkey = imgkey.substring(0, 10) }
                } catch(e){}
                break
            }
        }
    }
    else if(/\/s\//.test(href)){ page_url = href.replace(/\?.*/, '') }
    if(imgkey == ''){ alert('Cannot find the first imgkey.'); throw 'exit' }

    var showkey = ''
    try {
        showkey = /\bshowkey=['"]?([-0-9a-z]+)/.exec(GM_xmlhttpRequest({
            method: 'GET',
            url: page_url,
            synchronous: true,
        }).responseText)[1]
    } catch(e){}
    if(showkey == ''){ alert('Cannot find the first showkey.'); throw 'exit' }

    var b = doc.body
    var append_img = function()
    {
        GM_xmlhttpRequest({
            method: 'POST',
            url: 'http://g.e-hentai.org/api.php',
            data: JSON.stringify({'method':'showpage', 'gid':gid, 'page':page, 'imgkey':imgkey, 'showkey':showkey}),
            onload: function(response)
            {
                var i3 = JSON.parse(response.responseText)['i3']
                var img_src = /src=['"]([^'"]+)['"]/.exec(i3)[1].replace(/&amp;/g, '&')

                var img = new Image()
                img.id = page
                img.onerror = function(){ this.onerror = null; this.style.display = 'none' }
                img.src = img_src
                img.style.cssText = 'display: block; margin-left: auto; margin-right: auto'
                img.width = wnd.innerWidth * 0.70
                b.appendChild(doc.createTextNode('p. '+page))
                b.appendChild(doc.createElement('BR'))
                b.appendChild(img)
                b.appendChild(doc.createElement('BR'))

                if(page >= filecount){ return }
                var m = /\/s\/([^'"]+?)\/[^'"]+-([0-9]+)['"]/.exec(i3)
                if(m == null){ alert('An error happened when parsing p. ' + page); return }
                imgkey = m[1]
                page = parseInt(m[2])
                setTimeout(append_img, 3000)
            }
        })
    }
    append_img()
}