wpr-beacon.min.js is added even if DONOTROCKETOPTIMIZE is set to true

[alfonso100]

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Describe the bug
wpr-beacon.min.js is added even if DONOTROCKETOPTIMIZE is set to true. So when you visit a page, the script is added, the detection triggers, and the entry is added into the wpr_above_the_fold table.
 
OCI will only obey the filter: add_filter( 'rocket_above_the_fold_optimization', '__return_false' );

To Reproduce
Steps to reproduce the behavior:

1. add define('DONOTROCKETOPTIMIZE', true);
2. Visit a page in incognito
3. See the beacon script injected
4. See the entry being added to the database

Expected behavior
DONOTROCKETOPTIMIZE should stop all the optimizations including Optimize Critical Images.
And maybe Lazy Render Content in 3.17. That's the logic for other optimizations

Screenshots

https://i.imgur.com/3K7V2lP.png

Additional context
related slack thread: https://wp-media.slack.com/archives/C43T1AYMQ/p1726159393548059

Acceptance Criteria (for WP Media team use only)
Clear instructions for developers, to be added before the grooming

[Miraeld]

Reproduce the issue:

1. Add define('DONOTROCKETOPTIMIZE', true); to your wp-config.php.
2. Visit a page in incognito mode.
3. Observe that the beacon script is injected.
4. Check the database to see the entry added to the wpr_above_the_fold table.

Identify the root cause

The issue is that the wpr-beacon.min.js script is being added even when DONOTROCKETOPTIMIZE is set to true. This causes the detection to trigger and an entry to be added to the wpr_above_the_fold table.

Scope a solution

To solve the issue, we need to modify the inject_beacon function in Processor.php to check for the DONOTROCKETOPTIMIZE constant and skip the injection if it is defined.

Code Changes

Modify Processor.php

1. Check for DONOTROCKETOPTIMIZE constant:
   • Add a condition to skip the beacon injection if DONOTROCKETOPTIMIZE is defined.

private function inject_beacon( $html, $url, $is_mobile ): string {
    if ( defined( 'DONOTROCKETOPTIMIZE' ) && DONOTROCKETOPTIMIZE ) {
        return $html;
    }

    $min = ( defined( 'SCRIPT_DEBUG' ) && SCRIPT_DEBUG ) ? '' : '.min';

    if ( ! $this->filesystem->exists( rocket_get_constant( 'WP_ROCKET_ASSETS_JS_PATH' ) . 'wpr-beacon' . $min . '.js' ) ) {
        return $html;
    }

    $default_width_threshold  = $is_mobile ? 393 : 1600;
    $default_height_threshold = $is_mobile ? 830 : 700;

    $width_threshold = rocket_apply_filter_and_deprecated(
        'rocket_performance_hints_optimization_width_threshold',
        [ $default_width_threshold, $is_mobile, $url ],
        '3.16.4',
        'rocket_lcp_width_threshold'
    );

    $height_threshold = rocket_apply_filter_and_deprecated(
        'rocket_performance_hints_optimization_height_threshold',
        [ $default_height_threshold, $is_mobile, $url ],
        '3.16.4',
        'rocket_lcp_height_threshold'
    );

    if ( ! is_int( $width_threshold ) ) {
        $width_threshold = $default_width_threshold;
    }

    if ( ! is_int( $height_threshold ) ) {
        $height_threshold = $default_height_threshold;
    }

    $default_delay = 500;

    $delay = rocket_apply_filter_and_deprecated(
        'rocket_performance_hints_optimization_delay',
        [ $default_delay, $is_mobile, $url ],
        '3.16.4',
        'rocket_lcp_delay'
    );

    if ( ! is_int( $delay ) ) {
        $delay = $default_delay;
    }

    $data = [
        'url'             => $url,
        'is_mobile'       => $is_mobile,
        'width_threshold' => $width_threshold,
        'height_threshold' => $height_threshold,
        'delay'           => $delay,
        'nonce'           => wp_create_nonce( 'rocket_beacon' ),
        'ajax_url'        => admin_url( 'admin-ajax.php' ),
        'status'          => [
            'atf' => true,
            'lrc' => true,
        ],
    ];

    $data_modified = null;
    foreach ( $this->factories as $factory ) {
        $data_modified = $factory->get_frontend_controller()->modify_beacon_data( $data );
    }

    $inline_script = '<script>var rocket_beacon_data = ' . wp_json_encode( $data_modified ) . '</script>';

    $script_url = rocket_get_constant( 'WP_ROCKET_ASSETS_JS_URL' ) . 'wpr-beacon' . $min . '.js';

    $script_tag = "<script data-name=\"wpr-wpr-beacon\" src='{$script_url}' async></script>"; // phpcs:ignore WordPress.WP.EnqueuedResources.NonEnqueuedScript

    return str_replace( '</body>', $inline_script . $script_tag . '</body>', $html );
}

Development steps:

• Modify the inject_beacon function in Processor.php to check for the DONOTROCKETOPTIMIZE constant.
• Ensure the beacon script is not injected when DONOTROCKETOPTIMIZE is set to true.

Effort estimation:

XS

Is a refactor needed in that part of the codebase?

No

[wordpressfan]

I want to relate between this one and the PR: #6998

Checking something before the final confirmation.

[remyperona]

One comment: you can use rocket_get_constant() to check for the constant definition and value, and it makes unit testing easier.