feat: Add support to enable/disable CSP at runtime

system/HTTP/ContentSecurityPolicy.php

@@ -402,6 +402,22 @@ public function enabled(): bool
         return $this->CSPEnabled;
     }
 
+    /**
+     * Enable Content Security Policy enforcement.
+     */
+    public function enable(): void
+    {
+        $this->CSPEnabled = true;
+    }
+
+    /**
+     * Disable Content Security Policy enforcement.
+     */
+    public function disable(): void
+    {
+        $this->CSPEnabled = false;
+    }
+
     /**
      * Whether adding nonce in style-* directives is enabled or not.
      */

tests/system/HTTP/ContentSecurityPolicyTest.php

@@ -91,6 +91,26 @@ public function testExistence(): void
         $this->assertHeaderEmitted('Content-Security-Policy:');
     }
 
+    #[PreserveGlobalState(false)]
+    #[RunInSeparateProcess]
+    public function testDisable(): void
+    {
+        $this->prepare(true);
+        $this->csp->disable();
+        $this->assertTrue($this->work());
+        $this->assertHeaderNotEmitted('Content-Security-Policy:');
+    }
+
+    #[PreserveGlobalState(false)]
+    #[RunInSeparateProcess]
+    public function testEnable(): void
+    {
+        $this->prepare(false);
+        $this->csp->enable();
+        $this->assertTrue($this->work());
+        $this->assertHeaderEmitted('Content-Security-Policy:');
+    }
+
     #[PreserveGlobalState(false)]
     #[RunInSeparateProcess]
     public function testReportOnly(): void

user_guide_src/source/changelogs/v4.8.0.rst

@@ -321,6 +321,7 @@ HTTP
   For example: ``php index.php command -- --myarg`` will pass ``--myarg`` as an argument instead of an option.
 - ``CLIRequest`` now supports options with values specified using an equals sign (e.g., ``--option=value``) in addition to the existing space-separated syntax (e.g., ``--option value``).
   This provides more flexibility in how you can pass options to CLI requests.
+- Added ``enable()`` and ``disable()`` methods to ``ContentSecurityPolicy`` to enable or disable the CSP header for the current request. See :ref:`csp-enable-disable`.
 - Added ``$enableStyleNonce`` and ``$enableScriptNonce`` options to ``Config\App`` to automatically add nonces to control whether to add nonces to style-* and script-* directives in the Content Security Policy (CSP) header when CSP is enabled. See :ref:`csp-control-nonce-generation` for details.
 - Added ``URI::withQuery()``, ``URI::withQueryArray()``, ``URI::withoutQueryVars()``, and ``URI::withOnlyQueryVars()`` to return cloned URIs with replaced or filtered query variables.
 - Added ``URI::withQueryVar()`` and ``URI::withQueryVars()`` to return a cloned URI with query variables added or replaced.

user_guide_src/source/outgoing/csp.rst

@@ -78,6 +78,30 @@ name or an array of them:
 The first parameter to each of the "add" methods is an appropriate string value,
 or an array of them.
 
+.. _csp-enable-disable:
+
+Enable or Disable CSP at Runtime
+================================
+
+.. versionadded:: 4.8.0
+
+You can enable or disable CSP for the current request by using the
+``enable()`` and ``disable()`` methods on the CSP instance.
+
+For example, to enable/disable CSP for a specific response:
+
+.. literalinclude:: csp/017.php
+
+The runtime value takes precedence over the ``CSPEnabled`` configuration value
+for the current response.
+
+These methods only affect the current response. After the response has been sent,
+the CSP instance is recreated and the value of ``CSPEnabled`` in
+**app/Config/App.php** is used as the default for subsequent requests.
+
+This allows applications to keep CSP enabled globally while temporarily disabling
+it for specific responses, or enable it only where required.
+
 Report Only
 ===========
 

user_guide_src/source/outgoing/csp/017.php

@@ -0,0 +1,10 @@
+<?php
+
+// get the CSP instance
+$csp = $this->response->getCSP();
+
+// Disable CSP for the request
+$csp->disable();
+
+// Re-enable CSP for the request
+$csp->enable();