Patch for MCF HTML extractor connector

Hello,

Here is a patch for the HTML extractor connector regarding the text extraction with or without HTML stripping : patch_html_extractor_connector_02_12_2020.txt

• Extraction of HTML code : I added a whitelist through the Jsoup cleaner to define what HTML elements are allowed to inforce the security. In the code I set to “relaxed”:

This whitelist allows a full range of text and structural body HTML: a, b, blockquote, br, caption, cite, code, col, colgroup, dd, div, dl, dt, em, h1, h2, h3, h4, h5, h6, i, img, li, ol, p, pre, q, small, span, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, u, ul

(more details here : https://jsoup.org/apidocs/org/jsoup/safety/Whitelist.html#relaxed())

A future improvement of the code would be to add a new parameter on the interface to choose what whitelist to choose.

• Extraction of text with stripping HTML activated : we keep only text nodes : all HTML will be stripped (same thing as before). The change is the Jsoup pretty print option is now set to false to keep line breaks.

Best regards