// ==UserScript==
// @run-at      document-start
// @name        General URL Cleaner
// @namespace   
// @description Cleans URL's from various popular sites. Also, makes sure the sites are using HTTPS.
// @include     /^https?://[a-z]+\.google(\.com?)?\.[a-z]{2,3}/.*$/
// @include     /^https?://www\.amazon(\.com?)?\.[a-z]{2,3}/.*$/
// @include     /^https?://www\.newegg\.c(om|a)/.*$/
// @include     /^https?://[a-z]+\.ebay(\.com?)?\.[a-z]{2,3}/.*$/
// @include     /^https?://www\.bing\.com/.*$/
// @include     https://www.youtube.com/*
// @include     http://stat.dealtime.com/*
// @include     http://www.imdb.com/*
// @exclude     https://apis.google.com/*
// @exclude     https://www.google.com/recaptcha/api2/*
// @version     2.6.1
// @license     GPL version 3 or any later version; http://www.gnu.org/copyleft/gpl.html
// @downloadURL none
// ==/UserScript==
var doc = document; var loc=location; var numLinks = 0;
var host = loc.host; var path = loc.pathname;
var ebay = /^[a-z]+\.ebay(\.com?)?\.[a-z]{2,3}$/;
var amazon = /^www\.amazon(\.com?)?\.[a-z]{2,3}$/;
var google = /^[a-z]+\.google(\.com?)?\.[a-z]{2,3}$/;
var amazonParams = /&(url|ie|pf_rd_[a-z]|bbn|rw_html_to_wsrp)=[^&#]*/;
var utmParams = /([?&#]utm_[a-z]+=[^&#]*|&)/g;
var bingParams = /&(go|qs|form|FORM|filt|pq|s[cpk]|qpvt|cvid)=[^&]*/g;
var youtubeParams = /&(feature|src_vid|annotation_id|[gh]l)=[^&]*/g;
var ebayParams = /&(_(o?sacat|odkw|from|trksid)|rt)=[^&]*/g;
var googleParams = /&(aqs|as_qdr|authuser|bav|bi[wh]|bs|bvm|cad|channel|complete|cp|s?client|dpr|es_sm|g(fe|ws)_rd|gpsrc|h[ls]|ie|n?um|btnG|o[eq]|pbx|p[fq]|rct|rlz|sa(fe)?|s?ei|site|source(id)?|spell|tab|tbas|tbo|usg|ved|xhr|gs_(l|r[ni]|mss|id))=[^&]*/g;

// -------- Main --------
if (host=='www.bing.com') {
    var newUrl = cleanBingSearch(doc.URL);
    if (loc.protocol=='http:') loc.replace(newUrl);
    else cleanPageUrl(newUrl);
    cleanLinks('all');
}
else if (host=='www.youtube.com') {
    if (path=='/watch') cleanPageUrl(cleanYoutubeVideo(doc.URL));
    else if (path=='/redirect') loc.replace(cleanYoutubeRedirect(loc.search));
    cleanLinks('youtube');
}
else if (host=='www.newegg.com'||host=='www.newegg.ca') {
    if (path=='/Product/Product.aspx') cleanPageUrl(cleanNeweggItem(loc));
    cleanLinks('newegg',1);
}
else if (host=='www.imdb.com') {
    if (loc.search) cleanPageUrl(cleanImdb(doc.URL));
    cleanLinks('imdb');
}
else if (google.test(host)) {
    if ((path=loc.pathname)=='/url'||path=='/imgres') loc.replace(cleanGoogleRedirect(loc.search));
    else if (loc.search) {
        cleanPageUrl(cleanGoogleSearch(doc.URL));
        cleanLinks('google',1);
        googleInstant();
    }
}
else if (ebay.test(host)) {
    if (path.includes('/itm/')) cleanPageUrl(cleanEbayItem(loc));
    else if (loc.search) cleanPageUrl(cleanEbaySearch(doc.URL));
    cleanLinks('ebay');
}
else if (amazon.test(host)) {
    if (path.includes('/dp/')) cleanPageUrl(cleanAmazonItemdp(loc));
    else if (path.includes('/gp/product')) cleanPageUrl(cleanAmazonItemgp(loc));
    else if (loc.search) cleanPageUrl(cleanAmazonParams(doc.URL));
    cleanLinks('amazon');
}
else if (host=='stat.dealtime.com' && path=='/DealFrame/DealFrame.cmp') {
    location.replace(cleanDealtime(doc.URL));
}

// -------- Front functions --------
function cleanPageUrl(newUrl) {
    if (newUrl != doc.URL) history.replaceState(null,null,newUrl);
}

function cleanLinks(site, remain=0) { new MutationObserver(function(_,self) {
    links = doc.getElementsByTagName("a");
    if (links.length>numLinks) { numLinks=links.length;
        for (var i=numLinks; 0<i--;) { a = links[i];
            try { if (a.host && a.protocol.startsWith('http')) {
                linkCleaners[site](a);
            }} catch(TypeError) {}
        }
    }
    if (!remain && doc.readyState=='complete') setTimeout(function(){self.disconnect();}, 20000);
}).observe(doc,{childList:true,subtree:true});}

function googleInstant() { new MutationObserver(function(_,self) {
    var search = doc.getElementById('lst-ib');
    if (search) { new MutationObserver(function() {
        if ((hash=loc.hash)=='#imgrc=_') history.replaceState(null,null,doc.URL.replace(hash,''));
        else if (hash && !hash.startsWith('#imgrc=')) {
            newUrl = loc.origin + (loc.pathname||'/') + cleanGoogleSearch('?'+(hash||loc.search).slice(1));
            history.replaceState(null,null,newUrl);
        }
        }).observe(search,{childList:true,attributes:true});
        self.disconnect();
    }
}).observe(doc,{childList:true,subtree:true});}

// -------- URL cleaning functions --------
function cleanGoogleSearch(url) {
    return url.replace('?','?&').replace(googleParams,'').replace('?&','?').replace(/^http\:/,'https:');
}
function cleanGoogleRedirect(url) {
    return decodeURIComponent(url.match(/[&?](img)?url=([^&]+)/)[2]);
}
function cleanBingSearch(url) {
    return url.replace('?','?&').replace(bingParams,'').replace('?&','?').replace(/^http\:/,'https:');
}
function cleanYoutubeVideo(url) {
    return url.replace("?","?&").replace(youtubeParams,'').replace("?&","?");
}
function cleanYoutubeRedirect(url) {
    return decodeURIComponent(url.match(/[?&]q=([^&]+)/)[1]);
}
function cleanEbaySearch(url) {
    return url.replace('?','?&').replace(ebayParams,'').replace('?&','?');
}
function cleanEbayItem(a) {
    return a.origin+'/itm'+a.pathname.match(/\/[0-9]{11,13}/)+a.hash;
}
function cleanNeweggItem(a) {
    return a.origin+'/Product/Product.aspx'+a.search.match(/\?Item=[^&]+/);
}
function cleanAmazonItemgp(a) {
    return a.origin+a.pathname.match(/\/gp\/product\/[A-Z0-9]{10}/)+a.hash;
}
function cleanAmazonItemdp(a) {
    return a.origin+a.pathname.match(/\/dp\/[A-Z0-9]{10}/)+a.hash;
}
function cleanAmazonParams(url) {
    return url.replace('?','?&').replace(amazonParams,'').replace('?&','?').replace(/\/ref=[^?&]+/,'');
}
function cleanDealtime(url) {
    return decodeURIComponent(url.match(/[&?]url=([^?&#]+)/)[1]).replace(/&(url|partner)=[^&#?]+/g,'');
}
function cleanImdb(url) {
    return url.replace('?','?&').replace(/&(pf_rd_[a-z]|ref_)=[^&#]*/,'').replace('?&','?').replace(/\?$/,'');
}

// -------- Link cleaning functions --------
var linkCleaners = {
    all:function(a) { host=a.host; path=a.pathname;
        if (google.test(host))
            if (path=='/imgres'||path=='/url') a.href = cleanGoogleRedirect(a.search);
            else if (a.search) a.search = cleanGoogleSearch(a.search);
        else if (host=='www.youtube.com')
            if (path=='/watch') a.search = cleanYoutubeVideo(a.search);
            else if (path=='/redirect') a.href = cleanYoutubeRedirect(a.search);
        else if (path=='/Product/Product.aspx' && (host=='www.newegg.com'||host=='www.newegg.ca'))
            a.href = cleanNeweggItem(a);
        else if (host=='www.imdb.com' && a.search)
            a.search = cleanImdb(a.search);
        else if (amazon.test(host))
            if (path.includes('/dp/')) a.href = cleanAmazonItemdp(a);
            else if (path.includes('/gp/product')) a.href = cleanAmazonItemgp(a);
            else if (a.search) a.href = cleanAmazonParams(a.href);
        else if (ebay.test(host))
            if (path.includes('/itm/')) a.href = cleanEbayItem(a);
            else if (a.search) a.search = cleanEbaySearch(a.search);
        else a.search = a.search.replace(utmParams,'');
    },
    amazon:function(a) {
        if (amazon.test(a.host))
            if (a.pathname.includes('/dp/')) a.href = cleanAmazonItemdp(a);
            else if (a.pathname.includes('/gp/product')) a.href = cleanAmazonItemgp(a);
            else if (a.search) a.href = cleanAmazonParams(a.href);
    },
    ebay:function(a) {
        if (ebay.test(a.host))
            if (a.pathname.includes('/itm/')) a.href = cleanEbayItem(a);
            else if (a.search) a.search = cleanEbaySearch(a.search);
    },
    newegg:function(a) {
        if (a.pathname=='/Product/Product.aspx' && (a.host=='www.newegg.com'||a.host=='www.newegg.ca'))
            a.href = cleanNeweggItem(a);
    },
    google:function(a) {
        a.removeAttribute('onmousedown');
        linkCleaners.all(a);
    },
    youtube:function(a) {
        a.classList.remove('yt-uix-redirect-link');
        a.classList.remove('spf-link');
        a.removeAttribute('data-sessionlink');
        old = a.href;
        linkCleaners.all(a);
        if (a.title==old) a.title=a.href;
    },
    imdb:function(a){
        if (a.host=='www.imdb.com' && a.search)
            a.search = cleanImdb(a.search);
    }
};