AppWorld DC Booth Kiosk Generator

AI-Generated iRule

Prompt: Inject a JavaScript analytics snippet into HTML response bodies before the closing </body> tag

Generated iRule (by F5 Distributed Cloud AI Assistant):

when HTTP_RESPONSE priority 500 {
    # Check if Content-Type header exists and contains "text/html"
    if { [HTTP::header exists "Content-Type"] && [string tolower [HTTP::header "Content-Type"]] contains "text/html" } {
        # Get Content-Length header value if present, else set to 0
        if { [HTTP::header exists "Content-Length"] } {
            set content_length [HTTP::header "Content-Length"]
        } else {
            set content_length 0
        }
        # Collect the entire response body based on Content-Length or up to 1MB if unknown or large
        if { $content_length > 0 && $content_length < 1048576 } {
            HTTP::collect $content_length
        } else {
            HTTP::collect 1048576
        }
    }
}

when HTTP_RESPONSE_DATA priority 500 {
    # Define the JavaScript analytics snippet to inject
    set js_snippet "<script>/* Analytics snippet here */</script>"

    # Get the full response body payload
    set content [HTTP::payload]

    # Search for the closing </body> tag case-insensitively
    if {[regexp -nocase -- {</body>} $content match body_tag_start]} {
        # Insert the JavaScript snippet before the closing </body> tag
        regsub -nocase -- {</body>} $content "${js_snippet}</body>" new_content
    } else {
        # If no </body> tag found, append the snippet at the end
        append content $js_snippet
        set new_content $content
    }

    # Replace the payload with the modified content
    HTTP::payload replace 0 [HTTP::payload length] $new_content

    # Update the Content-Length header to the new payload length
    HTTP::header replace "Content-Length" [string length $new_content]

    # Release the modified payload to continue processing
    HTTP::release
}

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