feat: Sign usign only PHP

composer.json

@@ -58,8 +58,15 @@
 			"OCA\\Libresign\\Tests\\Fixtures\\": "tests/php/fixtures/"
 		}
 	},
+	"repositories": [
+		{
+			"type": "vcs",
+			"url": "https://github.com/vitormattos/pdf-signer-php"
+		}
+	],
 	"require": {
 		"cweagans/composer-patches": "^2.0",
+		"jeidison/signer-php": "dev-feat/visible-signature-appearance",
 		"phpseclib/phpseclib": "^3.0"
 	}
 }

lib/Handler/SignEngine/JSignPdfHandler.php

@@ -366,20 +366,24 @@ private function signUsingVisibleElements(string $normalizedPdf, string $hashAlg
 						$params['--bg-path'] = $signatureImagePath;
 					}
 				} elseif ($params['--l2-text'] === '""') {
-					if ($backgroundPathForElement) {
+					if ($backgroundPathForElement && $signatureImagePath) {
 						$params['--bg-path'] = $this->mergeBackgroundWithSignature(
 							$backgroundPathForElement,
 							$signatureImagePath,
 							$this->normalizeScaleFactor($scaleFactor),
 						);
-					} else {
+					} elseif ($backgroundPathForElement) {
+						$params['--bg-path'] = $backgroundPathForElement;
+					} elseif ($signatureImagePath) {
 						$params['--bg-path'] = $signatureImagePath;
 					}
 				} else {
 					if ($renderMode === SignerElementsService::RENDER_MODE_GRAPHIC_AND_DESCRIPTION) {
 						$params['--render-mode'] = SignerElementsService::RENDER_MODE_GRAPHIC_AND_DESCRIPTION;
 						$params['--bg-path'] = $backgroundPathForElement;
-						$params['--img-path'] = $signatureImagePath;
+						if ($signatureImagePath) {
+							$params['--img-path'] = $signatureImagePath;
+						}
 					} elseif ($renderMode === SignerElementsService::RENDER_MODE_SIGNAME_AND_DESCRIPTION) {
 						$params['--render-mode'] = SignerElementsService::RENDER_MODE_GRAPHIC_AND_DESCRIPTION;
 						$params['--bg-path'] = $backgroundPathForElement;
@@ -586,7 +590,7 @@ private function parseSignatureText(): array {
 
 	public function getSignatureText(): string {
 		$renderMode = $this->signatureTextService->getRenderMode();
-		if ($renderMode !== 'GRAPHIC_ONLY') {
+		if ($renderMode !== SignerElementsService::RENDER_MODE_GRAPHIC_ONLY) {
 			$data = $this->parseSignatureText();
 			$signatureText = '"' . str_replace(
 				['"', '$'],