[WIP] Sign usign only PHP

lib/Handler/PhpNativeHandler.php

@@ -0,0 +1,98 @@
+<?php
+
+declare(strict_types=1);
+/**
+ * @copyright Copyright (c) 2023 Vitor Mattos <[email protected]>
+ *
+ * @author Vitor Mattos <[email protected]>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+namespace OCA\Libresign\Handler;
+
+use OCP\AppFramework\Services\IAppConfig;
+use Psr\Log\LoggerInterface;
+
+class PhpNativeHandler extends SignEngineHandler {
+	public function __construct(
+		private IAppConfig $appConfig,
+		private LoggerInterface $logger,
+	) {
+	}
+
+	/**
+	 * @psalm-suppress MixedReturnStatement
+	 */
+	public function sign(): string {
+		$param = $this->getJSignParam()
+			->setCertificate($this->getCertificate())
+			->setPdf($this->getInputFile()->getContent())
+			->setPassword($this->getPassword());
+
+		$signed = $this->signUsingVisibleElements();
+		if ($signed) {
+			return $signed;
+		}
+		$jSignPdf = $this->getJSignPdf();
+		$jSignPdf->setParam($param);
+		return $this->signWrapper($jSignPdf);
+	}
+
+	private function signUsingVisibleElements(): string {
+		$visibleElements = $this->getvisibleElements();
+		if ($visibleElements) {
+			$jSignPdf = $this->getJSignPdf();
+			$param = $this->getJSignParam();
+			foreach ($visibleElements as $element) {
+				$param
+					->setJSignParameters(
+						$param->getJSignParameters() .
+						' -pg ' . $element->getFileElement()->getPage() .
+						' -llx ' . $element->getFileElement()->getLlx() .
+						' -lly ' . $element->getFileElement()->getLly() .
+						' -urx ' . $element->getFileElement()->getUrx() .
+						' -ury ' . $element->getFileElement()->getUry() .
+						' --l2-text ""' .
+						' -V' .
+						' --bg-path ' . $element->getTempFile()
+					);
+				$jSignPdf->setParam($param);
+				$signed = $this->signWrapper($jSignPdf);
+			}
+			return $signed;
+		}
+		return '';
+	}
+
+	private function signWrapper(JSignPDF $jSignPDF): string {
+		try {
+			return $jSignPDF->sign();
+		} catch (\Throwable $th) {
+			$rows = str_getcsv($th->getMessage());
+			$hashAlgorithm = array_filter($rows, fn ($r) => str_contains($r, 'The chosen hash algorithm'));
+			if (!empty($hashAlgorithm)) {
+				$hashAlgorithm = current($hashAlgorithm);
+				$hashAlgorithm = trim($hashAlgorithm, 'INFO ');
+				$hashAlgorithm = str_replace('\"', '"', $hashAlgorithm);
+				$hashAlgorithm = preg_replace('/\.( )/', ".\n", $hashAlgorithm);
+				throw new LibresignException($hashAlgorithm);
+			}
+			$this->logger->error('Error at JSignPdf side. LibreSign can not do nothing. Follow the error message: ' . $th->getMessage());
+			throw new \Exception($th->getMessage());
+		}
+	}
+}

lib/Handler/Pkcs12Handler.php

@@ -107,8 +107,8 @@ public function getPfx(?string $uid = null): string {
 	}
 
 	private function getHandler(): SignEngineHandler {
-		$sign_engine = $this->appConfig->getAppValue('sign_engine', 'JSignPdf');
-		$property = lcfirst($sign_engine) . 'Handler';
+		$signature_engine = $this->appConfig->getAppValue('signature_engine', 'JSignPdf');
+		$property = lcfirst($signature_engine) . 'Handler';
 		if (!property_exists($this, $property)) {
 			throw new LibresignException($this->l10n->t('Invalid Sign engine.'), 400);
 		}

lib/Service/Install/ConfigureCheckService.php

@@ -54,6 +54,10 @@ public function checkSign(): array {
 	 * @return ConfigureCheckHelper[]
 	 */
 	public function checkJSignPdf(): array {
+		$signatureEngine = $this->appConfig->getAppValue('signature_engine', 'jsignpdf');
+		if ($signatureEngine !== 'jsignpdf') {
+			return [];
+		}
 		$jsignpdJarPath = $this->appConfig->getAppValue('jsignpdf_jar_path');
 		if ($jsignpdJarPath) {
 			if (file_exists($jsignpdJarPath)) {
@@ -166,6 +170,10 @@ public function checkPdftk(): array {
 	 * @return ConfigureCheckHelper[]
 	 */
 	private function checkJava(): array {
+		$signatureEngine = $this->appConfig->getAppValue('signature_engine', 'jsignpdf');
+		if ($signatureEngine !== 'jsignpdf') {
+			return [];
+		}
 		$javaPath = $this->appConfig->getAppValue('java_path');
 		if ($javaPath) {
 			if (file_exists($javaPath)) {

lib/Service/Install/InstallService.php

@@ -308,6 +308,10 @@ public function setResource(string $resource): self {
 	}
 
 	public function installJava(?bool $async = false): void {
+		$signatureEngine = $this->appConfig->getAppValue('signature_engine', 'jsignpdf');
+		if ($signatureEngine !== 'jsignpdf') {
+			return;
+		}
 		$this->setResource('java');
 		if ($async) {
 			$this->runAsync();
@@ -378,6 +382,10 @@ public function uninstallJava(): void {
 	}
 
 	public function installJSignPdf(?bool $async = false): void {
+		$signatureEngine = $this->appConfig->getAppValue('signature_engine', 'jsignpdf');
+		if ($signatureEngine !== 'jsignpdf') {
+			return;
+		}
 		if (!extension_loaded('zip')) {
 			throw new RuntimeException('Zip extension is not available');
 		}

src/views/Settings/Settings.vue

@@ -24,6 +24,7 @@
 <template>
 	<NcSettingsSection :name="name">
 		<CertificateEngine />
+		<SignatureEngine />
 		<DownloadBinaries />
 		<ConfigureCheck />
 		<RootCertificateCfssl />
@@ -42,6 +43,7 @@
 <script>
 import NcSettingsSection from '@nextcloud/vue/dist/Components/NcSettingsSection.js'
 import CertificateEngine from './CertificateEngine.vue'
+import SignatureEngine from './SignatureEngine.vue'
 import DownloadBinaries from './DownloadBinaries.vue'
 import ConfigureCheck from './ConfigureCheck.vue'
 import RootCertificateCfssl from './RootCertificateCfssl.vue'
@@ -60,6 +62,7 @@ export default {
 	components: {
 		NcSettingsSection,
 		CertificateEngine,
+		SignatureEngine,
 		DownloadBinaries,
 		ConfigureCheck,
 		RootCertificateCfssl,

src/views/Settings/SignatureEngine.vue

@@ -0,0 +1,64 @@
+<template>
+	<NcSettingsSection :name="name" :description="description">
+		<div class="signature-engine-content">
+			<NcSelect input-id="signatureEngine"
+				:aria-label-combobox="description"
+				:clearable="false"
+				:value="value"
+				:options="options"
+				@input="saveEngine" />
+		</div>
+	</NcSettingsSection>
+</template>
+<script>
+import { translate as t } from '@nextcloud/l10n'
+import NcSettingsSection from '@nextcloud/vue/dist/Components/NcSettingsSection.js'
+import NcSelect from '@nextcloud/vue/dist/Components/NcSelect.js'
+import { emit } from '@nextcloud/event-bus'
+import { loadState } from '@nextcloud/initial-state'
+
+export default {
+	name: 'SignatureEngine',
+	components: {
+		NcSettingsSection,
+		NcSelect,
+	},
+	data() {
+		return {
+			name: t('libresign', 'Signature engine'),
+			description: t('libresign', 'Select the signature engine to sign the documents'),
+			value: [],
+			options: [
+				{ id: 'JSignPdf', label: 'JSignPdf' },
+				{ id: 'PhpNative', label: 'PHP native' },
+			],
+		}
+	},
+	beforeMount() {
+		const currentOption = {}
+		currentOption.id = loadState('libresign', 'signature_engine', 'JSignPdf')
+		if (currentOption.id === 'JSignPdf') {
+			currentOption.label = 'JSignPdf'
+		} else {
+			currentOption.label = 'PHP native'
+		}
+		this.value = [currentOption]
+	},
+	methods: {
+		saveEngine(selected) {
+			this.value = selected
+			OCP.AppConfig.setValue('libresign', 'signature_engine', selected.id, {
+				success() {
+					emit('libresign:signature-engine:changed', selected.id)
+				},
+			})
+		},
+	},
+}
+</script>
+<style scoped>
+.signature-engine-content{
+	display: flex;
+	flex-direction: column;
+}
+</style>