link.springer.com download links in search

// ==UserScript==
// @name         Springer Link add download-URLs to search results
// @version      0.1
// @author       J.-T. Brinkmann
// @include      https://link.springer.com/search*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    const DL_TEXT = "[dl]"
    const DL_LOADING = "[dl...]"

    ;[...document.querySelectorAll('h2 a.title')].forEach($el => {
        const url = $el.href
        const $dl = document.createElement('a')
        $dl.textContent = "[dl]"
        $dl.style.marginLeft = "1em"
        $dl.href = url
        $dl.download = ""
        let loaded = false
        $dl.addEventListener('click', async (e) => {
            if (!loaded) {
                loaded = true
                e.preventDefault()
                console.log("loading", url)
                $dl.style.color = "#aaa"
                $dl.textContent = DL_LOADING
                const res = await fetch(url).then(r=>r.text())
                const dlUrl = res.match(/<a href="([^"]*?)" [^>]*class="[^"]*?test-bookpdf-link/)[1]
                $dl.href = dlUrl
                $dl.click()
                $dl.style.color = ""
                $dl.textColor = DL_TEXT
            }
        })
        $el.after($dl)
    })
})();