// ==UserScript==
// @name Bypass paywalls for scientific documents
// @namespace StephenP
// @version 3.4.3.1
// @description Bypass paywalls for scientific documents by downloading them from sci-hub instead of paying something like 50 bucks for each paper. This script adds download buttons on Google Scholar, Scopus and Web Of Science, which lead to sci-hub.tw. In this way you can get free access to scientific papers even if you (or your university) can't afford their prices.
// @author StephenP
// @include http://scholar.google.*/scholar?*
// @match http://www.scopus.com/record/display.uri?*
// @match http://apps.webofknowledge.com/full_record.do?*
// @match http://apps.webofknowledge.com/InterService.do?*
// @match http://apps.webofknowledge.com/CitedFullRecord.do?*
// @include https://scholar.google.*/scholar?*
// @match https://www.scopus.com/record/display.uri?*
// @match https://www.scopus.com/*
// @match https://apps.webofknowledge.com/full_record.do?*
// @match https://apps.webofknowledge.com/InterService.do?*
// @match https://apps.webofknowledge.com/CitedFullRecord.do?*
// @contributionURL https://buymeacoffee.com/stephenp_greasyfork
// Following permissions are necessary to keep the sci-hub domain updated: once a day, the script checks if Sci-Hub can be reached at the known domain:
// if it can't be reached, the script retrieves the new domain (if it's been updated) from Sci-Hub's official VK account.
// @grant GM.setValue
// @grant GM.getValue
// @grant GM.deleteValue
// @grant GM.xmlHttpRequest
// @connect vk.com
// @connect *
// "connect *" is used as Sci-hub's domain can change, and the script needs to check whatever it thinks is the sci-hub's domain to see if it's valid.
// @license AGPL-3.0-or-later
// ==/UserScript==
/*
Copyright (C) 2021 StephenP
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
(async function(){
var sciHubDomain=await getSciHubDomain();
if(sciHubDomain.toString().split(".").length>=2){//the last check, to verify if the result of getSciHubDomain is actually a web domain.
start(sciHubDomain);
}
else{
start("https://sci-hub.ru/");//fallback to default domain
}
})();
async function getSciHubDomain(){
var url=await GM.getValue("scihubDomain", "none");
let date=new Date();
const tsNow=date.getDate().toString()+"/"+date.getMonth().toString()+"/"+date.getFullYear().toString();
var tsOld=await GM.getValue("lastSync", false);
if((url==="none")||(tsNow!==tsOld)){
if(!(await isSciHubReachable(url))){
var newUrl=await setSciHubDomain(url);
if(!(await isSciHubReachable(newUrl))){
console.log("%cOld sci-hub domain ("+url+") is not available and no new domain has been found", "color: red; background-color: white; font-size: 2em");
GM.deleteValue("lastSync");
return url;
}
else{
let dateb=new Date();
GM.setValue("lastSync",dateb.getDate().toString()+"/"+dateb.getMonth().toString()+"/"+dateb.getFullYear().toString());
return newUrl;
}
}
else{
let datec=new Date();
GM.setValue("lastSync",datec.getDate().toString()+"/"+datec.getMonth().toString()+"/"+datec.getFullYear().toString());
return url;
}
}
else{
console.log("%cSci-hub domain has been already checked today and it was working. The script will keep using "+url, "color: green; background-color: white; font-size: 2em");
return url;
}
}
async function setSciHubDomain(oldUrl){
return new Promise((resolve, reject) =>{
console.log("%cRequesting new sci-hub domain from official sci-hub's vk account", "color: orange; background-color: white; font-size: 2em");
GM.xmlHttpRequest({
method: "GET",
url: "https://vk.com/sci_hub",
onload: function(response) {
let parser = new DOMParser();
let doc = parser.parseFromString(response.responseText, "text/html");
var url="not available";
var possibleLinks=doc.querySelectorAll(".group_info_row.info a");
if(possibleLinks.length==1){
url=possibleLinks[0].textContent;
}
else if(possibleLinks.length>1){
url=doc.querySelector('.group_info_row.info a[href*="sci-hub"]').textContent;
}
if(!oldUrl.includes(url)){
console.log("%cNew sci-hub domain has been retrieved: "+url, "color: green; background-color: white; font-size: 2em");
GM.setValue("scihubDomain","https://"+url+"/");
}
resolve("https://"+url+"/");
},
onerror: function(response){
resolve(oldUrl);
}
});
});
}
async function isSciHubReachable(d){
if(d==="none"){
return false;
}
else{
return new Promise((resolve, reject) =>{
console.log("%cTesting if sci-hub can be reached", "color: orange; background-color: white; font-size: 2em");
GM.xmlHttpRequest({
method: "GET",
url: d+"donate",
onload: function(response) {
if((response.responseText.includes("12PCbUDS4ho7vgSccmixKTHmq9qL2mdSns"))||(response.responseText.includes("bc1q7eqheemcu6xpgr42vl0ayel6wj087nxdfjfndf"))){//if it's not the original sci-hub page, it's most likely not to show the real bitcoin addresses for donations. This is not a failsafe method, as a fake page could display another address and keep the real ones hidden.
console.log("%cSci-hub is available, no need to update the domain.", "color: green; background-color: white; font-size: 2em");
resolve(true);
}
else{
console.log("%cSci-hub domain available, but there isn't the sci-hub website there. I'll try to update the domain.", "color: orange; background-color: white; font-size: 2em");
resolve(false);
}
},
onerror: function(response) {
console.log("%cSci-hub domain not available, I'll try to update the domain.", "color: orange; background-color: white; font-size: 2em");
resolve(false);
}
});
});
}
}
function start(sciHubUrl) {
'use strict';
console.log("%cCurrent Sci-Hub domain: "+sciHubUrl, "color: green; background-color: white; font-size: 2em");
var documentId;
var site=window.location.href.toString();
var i;
if(site.includes("://www.scopus.com/")){
try{
var fullDocument=document.createElement("LI");
fullDocument.innerHTML="Full text from Sci-Hub";
fullDocument.style.cursor="pointer";
fullDocument.style.color="#ff6c00";
console.log("::Bypass paywalls for scientific documents:: Obtaining document id...");
documentId=document.getElementById("recordDOI").innerHTML;
console.log("::Bypass paywalls for scientific documents:: Document id is "+documentId);
fullDocument.addEventListener('click',function(){window.open(sciHubUrl+documentId)});
console.log("::Bypass paywalls for scientific documents:: Finding a place where to put the Sci-Hub button...");
document.getElementById('quickLinks').children[0].appendChild(fullDocument);
console.log("::Bypass paywalls for scientific documents:: Sci-Hub button placed!");
var donateBtn=document.createElement("LI");
donateBtn.innerHTML="Donate to Sci-Hub";
donateBtn.style.cursor="pointer";
donateBtn.addEventListener('click',function(){donate(sciHubUrl)});
console.log("::Bypass paywalls for scientific documents:: Finding a place where to put the donation button...");
document.getElementById('quickLinks').children[0].appendChild(donateBtn);
console.log("::Bypass paywalls for scientific documents:: Donation button placed!");
}
catch(err){
console.log("::Bypass paywalls for scientific documents:: Error! "+err);
}
}
else if(site.includes("://apps.webofknowledge.com/")){
var mode;
var genericID=document.getElementsByClassName("block-record-info block-record-info-source")[0].getElementsByClassName("FR_label");
for(i=0;i<=genericID.length;i++){
if((genericID[i].innerHTML==="DOI:")||(genericID[i].innerHTML==="PMID:")){
documentId=genericID[i].parentNode.children[1].innerHTML;
console.log(documentId);
break;
}
}
if(documentId!==undefined){
addButtonWOS(sciHubUrl,documentId);
}
}
else if(site.includes("://scholar.google.")){
var resourcesList=document.getElementById('gs_res_ccl_mid');
var results=resourcesList.children.length;
var gs_ggs_gs_fl;
for(i=0;i<results;i++){
try{
if(resourcesList.children[i].getElementsByClassName("gs_ggs gs_fl").length==0){
gs_ggs_gs_fl=document.createElement("div");
gs_ggs_gs_fl.setAttribute("class","gs_ggs gs_fl");
gs_ggs_gs_fl.appendChild(document.createElement("div"));
gs_ggs_gs_fl.children[0].setAttribute("class","gs_ggsd");
gs_ggs_gs_fl.children[0].appendChild(document.createElement("div"));
gs_ggs_gs_fl.children[0].children[0].setAttribute("class","gs_or_ggsm");
resourcesList.children[i].insertBefore(gs_ggs_gs_fl,resourcesList.children[i].firstChild);
addButtonScholar(sciHubUrl,resourcesList.children[i].firstChild);
}
else{
addButtonScholar(sciHubUrl,resourcesList.children[i].firstChild);
}
}
catch(err){
console.error(err+"//"+resourcesList.children[i].lastElementChild.innerHTML);
}
}
}
}
function addButtonWOS(sciHubUrl,documentId){
try{
var site=window.location.href.toString();
const fTBtn=document.getElementsByClassName("solo_full_text")[0];
var sciHubBtn = fTBtn.cloneNode(true);
var list=document.getElementsByClassName("l-columns-item")[0];
sciHubBtn.setAttribute("alt","Break the walls and free the knowledge that publishers taken hostage\!");
sciHubBtn.setAttribute("title","Break the walls and free the knowledge that publishers taken hostage\!");
sciHubBtn.setAttribute("id","sciHubBtn");
sciHubBtn.getElementsByTagName('A')[0].innerHTML="Search on Sci-Hub";
sciHubBtn.getElementsByTagName('A')[0].removeAttribute("href");
sciHubBtn.getElementsByTagName('A')[0].removeAttribute("onclick");
sciHubBtn.getElementsByTagName('A')[0].addEventListener("click",function(){window.open(sciHubUrl+documentId);});
sciHubBtn.style.cursor="pointer";
fTBtn.children[0].style.marginLeft="0";
sciHubBtn.style.marginRight="0";
list.insertAdjacentHTML('beforeend','<li><a style="font-size: 12px; margin-left: 10px; color: green; text-decoration: underline;" href="javascript:;">Donate to Sci-Hub project</a></li>');
list.lastChild.lastChild.removeAttribute("href");
list.lastChild.lastChild.addEventListener("click", function(){donate(sciHubUrl);});
list.lastChild.lastChild.style.cursor="pointer";
fTBtn.parentNode.insertBefore(sciHubBtn, fTBtn);
//list.insertBefore(sciHubBtn,list.lastChild);
}
catch(err){
console.log(err);
}
//setAttribute('onclick',donate(sciHubUrl));
}
function addButtonScholar(sciHubUrl,linkDiv){
//alert(linkDiv.innerHTML);
var link;
try{
link=linkDiv.getElementsByTagName("A")[0].href;
}
catch(err){
link=linkDiv.parentNode.getElementsByClassName("gs_rt")[0].getElementsByTagName("A")[0].href;
}
if(link.includes("scholar?output")){
link=linkDiv.parentNode.getElementsByClassName("gs_rt")[0].getElementsByTagName("A")[0].href;
}
if(link!=undefined){
var creatingElement;
if((link!=undefined)&&(link.search("patents.google")==-1)){
creatingElement=document.createElement("a");
creatingElement.innerHTML='<a>Search on Sci-Hub</a>';
linkDiv.getElementsByClassName("gs_or_ggsm")[0].appendChild(creatingElement);
linkDiv.getElementsByClassName("gs_or_ggsm")[0].lastChild.addEventListener("click", function(){window.open(sciHubUrl+link);});
linkDiv.getElementsByClassName("gs_or_ggsm")[0].lastChild.style.cursor="pointer";
//setAttribute("onclick",'window.open(\"'+sciHubUrl+link+'\");');
}
}
document.head.innerHTML = document.head.innerHTML.replace(/13px 8px 9px 8px/g, '0px 8px 0px 8px');
}
function donate(sciHubUrl){
window.open(sciHubUrl+'#donate');
}
