Create DMARC DNS Records for Email Authentication Generate DMARC DNS records for email authentication policy.

The tool uses React to manage state and handle user input, storing values in variables like domain, policy, rua, pct, output, and copied. When the generate button is clicked, it calls the generate function, which constructs a DMARC record string by concatenating parts based on user input, using JavaScript's array push method and JSON.stringify to format the output. The generated record includes the protocol version v=DMARC1, policy, and optional rua and pct values if specified. The tool utilizes TypeScript for type checking and uses React Hooks like useState and useCallback to optimize performance.

Under the hood, it relies on browser APIs like copyToClipboard to handle copying the generated DMARC record to the user's clipboard. The code also imports utility functions from a separate module, including cn for conditional class names and copyToClipboard for handling clipboard operations. When generating the DMARC record, it uses string concatenation and template literals to build the output string in the format _dmarc.domain IN TXT. The tool handles user input through HTML form elements like text inputs, buttons, and range sliders, using React's onChange event handlers to update state variables.

The generated DMARC record is displayed in a preformatted text block, allowing users to easily copy and paste it into their DNS settings. The tool uses CSS classes from the glass-input and glass-button modules to style its user interface components. When the copy button is clicked, it calls the copy function, which attempts to copy the output string to the clipboard using the copyToClipboard API, displaying a success message if the operation is successful.