Instruction: Discuss strategies for protecting an AngularJS application from cross-site scripting (XSS) attacks.
Context: This question examines the candidate's awareness of security best practices in web development, specifically within the context of AngularJS.
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First and foremost, AngularJS treats all values as untrusted by default. When it comes to binding data to HTML, AngularJS automatically escapes inputs, thus preventing HTML injection, a common form of XSS attack. This means that if an application tries to bind user input directly into the HTML, AngularJS sanitizes it first to ensure that potentially malicious scripts are not executed. This automatic sanitization process is a critical line of defense. However, it's essential to never bypass this security feature by using functions like $sce.trustAsHtml(), unless absolutely necessary and the data can be trusted completely.
Another key strategy is to leverage Content Security Policy (CSP). CSP is a browser security mechanism that helps detect and mitigate certain types of...