from-reference-to-eink.js

// to be used with a shortcut to get a DOI, e.g on Tridactyl on a Frontiers page :
// bind q js var ref = document.querySelector('div.References:hover'); var doi; if (ref) doi = ref.innerText.replace(/.*doi:/, "").split("\n")[0]; if (doi) fetch('http://localhost:3467/?doi='+doi).then(response => response.json()).then(data => alert(data.result));

/* to visually highlight what references have already been sent :
var ref = document.querySelector('div.References:hover'); 
if (ref) ref.innerText.replace(/.*doi/, "doi").split("\n")[0]; 
var text = ref.firstChild.lastChild.textContent.split("doi:"); 
ref.firstChild.lastChild.textContent = text[0]; 
var el = document.createElement("span"); 
el.style.background = "lightblue"; 
el.textContent = "doi:" + text[1]; 
ref.firstChild.appendChild(el);
*/

const fs = require('fs');
const express = require('express')
const cors = require('cors')
const https = require('https')
const path = require('path')
const {execSync} = require('child_process');

const app = express()
app.use(cors())

// could check for protonvpn-cli s first and if disabled do protonvpn-cli r
const URL="https://legitimate-portal.net";

app.get('/', function(req, res){
        console.log(req.query.doi);
        var DOI=req.query.doi;
        if (!DOI) res.json({"status":"DOI missing"})
        var filename = DOI.replaceAll("\/","_").replaceAll(".","-")+".pdf";
        var getPage = `curl ${URL}/${DOI} | grep "button onclick" | sed "s/.*='//" | sed "s/'.*//"`
        // could replace curl and parsing with fetch and proper JS instead
        var page = execSync(getPage, {cwd:"pdfs"}).toString().replaceAll("\n","");
        if (!page) { 
                res.json({"result":"no document found"});
                console.log("failed, no result found");
                return
        }
        var target = URL+page
        if (page.indexOf("//") > -1 ) target = "https:" + page
        // might return a full URL instead, if so then don't prepend with the hardcoded domain
        var getPDFcmd = `wget ${target} -O ${filename}`
        var newpdf = execSync(getPDFcmd, {cwd:"pdfs"}).toString()
        var cmd = `scp ${filename} remarkable2:/home/root/ && ssh remarkable2 -t "source /home/root/.bashrc; addWithMetadataIfNew ${filename}; systemctl restart xochitl"`
        // assumes all ssh goes well. Should at least check if the device is reachable first.
        var sendResultToLocalRemarkable = execSync(cmd, {cwd:"pdfs"})
        res.json({"status":"test", "filename":filename, "result":filename})
});

app.use('/static', express.static(path.join(__dirname, 'pdfs')))
// accessible only directly e.g. http://localhost:3467/static/modifiedDOI.pdf
// could instead return a JSON of available files
const port = 3467
app.listen(port, () =>
  console.log('Remarkable file send via DOI listening on port', port)
);