Unescaping HTML Entities in JavaScript
Problem:
When receiving HTML strings from an XML-RPC backend, they render literally instead of being rendered as HTML elements. This suggests that the HTML is being escaped over the XML-RPC channel.
Solution Using DOMParser:
To correctly unescape HTML entities in JavaScript without introducing security vulnerabilities, it is recommended to use the DOMParser interface. DOMParser creates a DOM tree from the provided HTML string, which can then be used to retrieve the unescaped text content.
Here's an updated version of the htmlDecode function that utilizes DOMParser:
function htmlDecode(input) { var doc = new DOMParser().parseFromString(input, "text/html"); return doc.documentElement.textContent; }
The following examples demonstrate how to use the updated function:
console.log(htmlDecode("<img src='myimage.jpg'>")); // "<img src='myimage.jpg'>" console.log(htmlDecode("<img src='dummy' onerror='alert(/xss/)'>")); // ""
In the second example, the potentially malicious HTML string is unescaped correctly, resulting in an empty string to prevent cross-site scripting (XSS) vulnerabilities.
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