ENH Do not show icon if binary is not available

src/Extensions/PdfExportControllerExtension.php

@@ -12,6 +12,7 @@
 use SilverStripe\Core\Extension;
 use SilverStripe\Versioned\Versioned;
 use SilverStripe\Dev\Deprecation;
+use SilverStripe\CMS\Controllers\ContentController;
 
 class PdfExportControllerExtension extends Extension
 {
@@ -29,6 +30,10 @@ public function downloadpdf()
         if (!$this->owner->data()->config()->get('pdf_export')) {
             return false;
         }
+        $binaryPath = $this->getBinaryPath();
+        if (!$binaryPath) {
+            return HTTPResponse::create('PDF download is not available', 400);
+        }
 
         // We only allow producing live pdf. There is no way to secure the draft files.
         Versioned::set_stage(Versioned::LIVE);
@@ -80,12 +85,7 @@ public function getPDFProxy($pdfBaseUrl)
         return $proxy;
     }
 
-    /**
-     * Render the page as PDF using wkhtmltopdf.
-     *
-     * @return HTTPResponse|false
-     */
-    public function generatePDF()
+    private function getBinaryPath()
     {
         if (!$this->owner->data()->config()->get('pdf_export')) {
             return false;
@@ -105,7 +105,20 @@ public function generatePDF()
                 $binaryPath = Environment::getEnv('WKHTMLTOPDF_BINARY');
             }
         }
+        return $binaryPath;
+    }
 
+    /**
+     * Render the page as PDF using wkhtmltopdf.
+     *
+     * @return HTTPResponse|false
+     */
+    public function generatePDF()
+    {
+        if (!$this->owner->data()->config()->get('pdf_export')) {
+            return false;
+        }
+        $binaryPath = $this->getBinaryPath();
         if (!$binaryPath) {
             user_error(
                 'Neither WKHTMLTOPDF_BINARY nor ' . get_class($this->owner->data()) . '.wkhtmltopdf_binary are defined',

src/Extensions/PdfExportExtension.php

@@ -6,6 +6,8 @@
 use SilverStripe\Control\Director;
 use SilverStripe\ORM\DataExtension;
 use SilverStripe\Versioned\Versioned;
+use SilverStripe\Dev\Deprecation;
+use SilverStripe\Core\Environment;
 
 class PdfExportExtension extends DataExtension
 {
@@ -23,6 +25,12 @@ class PdfExportExtension extends DataExtension
      */
     private static $pdf_base_url = '';
 
+    /**
+     * Used to bypass the check to see if the wkhtmltopdf binary is avilable
+     * Only used for unit testing
+     */
+    private static bool $bypass_pdf_binary_check = false;
+
     /**
      * Allow custom overriding of the path to the WKHTMLTOPDF binary, in cases
      * where multiple versions of the binary are available to choose from. This
@@ -68,6 +76,24 @@ public function PdfLink()
             return false;
         }
 
+        if (!$this->owner->config()->get('bypass_pdf_binary_check')) {
+            $binaryPath = $this->owner->config()->get('wkhtmltopdf_binary');
+            if ($binaryPath) {
+                Deprecation::notice('3.0', 'wkhtmltopdf_binary config is deprecated. '.
+                    'Use WKHTMLTOPDF_BINARY env var instead.');
+            }
+            if (!$binaryPath || !is_executable($binaryPath ?? '')) {
+                if (Environment::getEnv('WKHTMLTOPDF_BINARY')
+                    && is_executable(Environment::getEnv('WKHTMLTOPDF_BINARY') ?? '')
+                ) {
+                    $binaryPath = Environment::getEnv('WKHTMLTOPDF_BINARY');
+                }
+            }
+            if (!$binaryPath) {
+                return false;
+            }
+        }
+
         $path = $this->getPdfFilename();
 
         if ((Versioned::get_stage() === Versioned::LIVE) && file_exists($path ?? '')) {

tests/Extensions/PdfExportExtensionTest.php

@@ -24,7 +24,8 @@ protected function setUp(): void
 
         Config::modify()
             ->set(BasePage::class, 'pdf_export', true)
-            ->set(BasePage::class, 'generated_pdf_path', 'assets/_generated_pdfs');
+            ->set(BasePage::class, 'generated_pdf_path', 'assets/_generated_pdfs')
+            ->set(BasePage::class, 'bypass_pdf_binary_check', true);
     }
 
     /**