Retrieving CSS content and resolving image references from external CSS files for the Link Validator

Currently, I am developing a Link Validator tool designed to analyze and validate all links within a specific domain based on a given seed page. For instance, when analyzing http://www.example.com/, the tool should assess all links associated with example.com.

The tool is set up to handle four types of files:

  1. Content Pages
  2. Images
  3. CSS
  4. Javascript files

For Content Pages, Images, and Javascript Files, I am utilizing the JSOUP Library. However, I am facing a challenge with CSS files that contain external resources. Specifically, I need a method to extract URL references from selectors like 


background-image : url('images.png');
border-image: url('border.png');
and then convert these URLs into absolute URLs. Unfortunately, it appears that the JSOUP library does not offer functionality for handling CSS Selectors and resolving their values as absolute URLs.

While manual string manipulation could be used to solve this issue, it would likely introduce errors. Therefore, I am exploring alternative built-in solutions.

I hope this clarifies my situation. Thank you for your assistance in advance.

javacssweb-applicationsjsoup

Answer №1

Manipulating the string should be relatively simple - just add a slash and the CSS reference to the URL. If there's a "../", you can remove all characters until the next "/". I'm not aware of any pre-built solutions for this, unfortunately. It's also important to prioritize processing images before checking internal links to avoid altering the URL unintentionally.

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