Introduce Web-scraping inside JabRef

[koppor]

Currently, our web search sends out search strings to API endpoints and then interprets the results. In other words: We have fetchers with API key and screen scraping. For the screen scapers, they mostly don't work. We should switch to a browser-based screen-scraping. Mostly because of CloudFlare.

JabRef should display the HTML page inside JabRef and offer scraping the citations directly from the page. Similar as BibDesk does.

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Maybe the Java Chromium Embedded Framework (JCEF) helps. The test class https://github.com/chromiumembedded/java-cef/blob/master/java/tests/detailed/handler/RequestHandler.java seems to guide one to the usage.

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The PR #7075 attempted to display the Google Scholar captchas in JabRef. The PR was not completed. -- This issue says: Rewrite the fetchers not to use URLDownload, but JCEF.

Note that this is different from #11093. There, a new UI is demanded.

Here, it should be allowed that the fetchers run stand-alone without user interaction.

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Affected fetchers:

• ACS: org.jabref.logic.importer.fetcher.ACS
• Google Scholar: org.jabref.logic.importer.fetcher.GoogleScholar)
• Icar: org.jabref.logic.importer.fetcher.IacrEprintFetcher
• JStor: org.jabref.logic.importer.fetcher.JstorFetcher
• ResearchGate: org.jabref.logic.importer.fetcher.ResearchGate
• ScienceDirect: org.jabref.logic.importer.fetcher.ScienceDirect
• SpringerLink: org.jabref.logic.importer.fetcher.SpringerLink

Sometimes, the API used. Then findFullText is the method handling HTML only.

[Siedlerchr]

Works now, was probably a temporary glitch

[Siedlerchr]

I checked the Bib Desk code:
They basically use a Safari based View Control and use a simple XPath query to check for matching links in the document's dom. The parsing itself is very similar to our existing fetcher infrastructure.
I experimented a bit with using javafx's WebView, while that can display websites and even captchas e.g. on google scholar,
I was not yet able to get the correct DOM after clicking on some page. This would require some further testing.

[koppor]

Related work: https://github.com/HtmlUnit/htmlunit?tab=readme-ov-file#getting-started

[ThiloteE]

When it comes to scrapping, I have seen JSoup being mentioned a lot: https://jsoup.org/
See also https://stackoverflow.com/questions/2835505/how-to-scan-a-website-or-page-for-info-and-bring-it-into-my-program

[koppor]

At JabRef#695, I tried out HtmlUnit, JCEF, and jbrowserdriver - nothing really worked.