• Douwe Maan's avatar
    Merge branch 'bugfix/html-only-mail' into 'master' · 2717675f
    Douwe Maan authored
    add parsing support for incoming html email
    
    ## What does this MR do?
    Fixes #18388 by adding support for parsing HTML email
    
    ## Are there points in the code the reviewer needs to double check?
    The new class, Gitlab::Email::HTMLParser, which needs to translate the HTML content to text and also delete replies, as they are not necessarily in the correct format to be caught by EmailReplyParser. The solution I found that should work for any HTML-formatted email is to remove all `<table>` and `<blockquote>` tags. Actual `<table>` elements (to be interpreted by markdown) should already be encoded with e.g. `&lt;table&gt;` - the only failure mode is if there is an *actual* HTML table in the content itself, which we wouldn't be able to support easily anyways.
    
    The gem `html2text` traverses the HTML tree and outputs text - and markdown in the case of HTML links or images.
    
    See merge request !7397
    2717675f
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