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chore: allows to sign pdf and add information on pdf
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Fabien
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Nov 18, 2024
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108 changes: 108 additions & 0 deletions
108
...ator/src/main/java/fr/dossierfacile/api/pdfgenerator/service/PdfSignatureServiceImpl.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,108 @@ | ||
| package fr.dossierfacile.api.pdfgenerator.service; | ||
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| import fr.dossierfacile.api.pdfgenerator.service.interfaces.PdfSignatureService; | ||
| import lombok.RequiredArgsConstructor; | ||
| import lombok.extern.slf4j.Slf4j; | ||
| import org.apache.pdfbox.pdmodel.PDDocument; | ||
| import org.apache.pdfbox.pdmodel.PDDocumentInformation; | ||
| import org.apache.pdfbox.pdmodel.interactive.digitalsignature.PDSignature; | ||
| import org.bouncycastle.cert.jcajce.JcaCertStore; | ||
| import org.bouncycastle.cms.CMSProcessableByteArray; | ||
| import org.bouncycastle.cms.CMSSignedData; | ||
| import org.bouncycastle.cms.CMSSignedDataGenerator; | ||
| import org.bouncycastle.cms.jcajce.JcaSignerInfoGeneratorBuilder; | ||
| import org.bouncycastle.operator.ContentSigner; | ||
| import org.bouncycastle.operator.jcajce.JcaContentSignerBuilder; | ||
| import org.bouncycastle.operator.jcajce.JcaDigestCalculatorProviderBuilder; | ||
| import org.bouncycastle.util.CollectionStore; | ||
| import org.springframework.beans.factory.annotation.Value; | ||
| import org.springframework.cglib.core.Local; | ||
| import org.springframework.stereotype.Service; | ||
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| import java.io.ByteArrayInputStream; | ||
| import java.io.ByteArrayOutputStream; | ||
| import java.io.IOException; | ||
| import java.io.InputStream; | ||
| import java.security.KeyFactory; | ||
| import java.security.PrivateKey; | ||
| import java.security.cert.Certificate; | ||
| import java.security.cert.CertificateFactory; | ||
| import java.security.cert.X509Certificate; | ||
| import java.security.spec.PKCS8EncodedKeySpec; | ||
| import java.util.Arrays; | ||
| import java.util.Base64; | ||
| import java.util.Calendar; | ||
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| @Slf4j | ||
| @Service | ||
| @RequiredArgsConstructor | ||
| public class PdfSignatureServiceImpl implements PdfSignatureService { | ||
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| @Value("${pdf.signature.activation:false}") | ||
| private boolean signatureActivation; | ||
| @Value("${pdf.certificate:}") | ||
| private String certificate; | ||
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| @Value("${pdf.private_key:}") | ||
| private String privateKey; | ||
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| @Override | ||
| public void signAndSave(PDDocument document, ByteArrayOutputStream baos) throws Exception { | ||
| PDDocumentInformation information = new PDDocumentInformation(); | ||
| information.setCreator("DossierFacile"); | ||
| information.setCreationDate(Calendar.getInstance()); | ||
| document.setDocumentInformation(information); | ||
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| if (!signatureActivation || certificate == null || privateKey == null) { | ||
| document.save(baos); | ||
| } else { | ||
| PDSignature signature = new PDSignature(); | ||
| signature.setFilter(PDSignature.FILTER_ADOBE_PPKLITE); | ||
| signature.setSubFilter(PDSignature.SUBFILTER_ADBE_PKCS7_DETACHED); | ||
| signature.setName("DossierFacile"); | ||
| signature.setReason("Document filigrané par DossierFacile"); | ||
| signature.setSignDate(Calendar.getInstance()); | ||
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| document.addSignature(signature, content -> { | ||
| try { | ||
| return signInputStream(loadPrivateKey(), loadCertifcateChain(), content); | ||
| } catch (Exception e) { | ||
| throw new IOException("Unable to sign the document", e); | ||
| } | ||
| }); | ||
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| document.save(baos); | ||
| } | ||
| } | ||
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| private Certificate[] loadCertifcateChain() throws Exception { | ||
| byte[] certBytes = Base64.getDecoder().decode(certificate); | ||
| CertificateFactory certFactory = CertificateFactory.getInstance("X.509"); | ||
| Certificate cert = certFactory.generateCertificate(new ByteArrayInputStream(certBytes)); | ||
| return new Certificate[]{cert}; | ||
| } | ||
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| private PrivateKey loadPrivateKey() throws Exception { | ||
| byte[] keyBytes = Base64.getDecoder().decode(privateKey); | ||
| PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(keyBytes); | ||
| KeyFactory keyFactory = KeyFactory.getInstance("RSA"); | ||
| return keyFactory.generatePrivate(keySpec); | ||
| } | ||
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| private byte[] signInputStream(PrivateKey privateKey, Certificate[] certificates, InputStream content) throws Exception { | ||
| CMSSignedDataGenerator generator = new CMSSignedDataGenerator(); | ||
| ContentSigner contentSigner = new JcaContentSignerBuilder("SHA256withRSA").build(privateKey); | ||
| generator.addSignerInfoGenerator(new JcaSignerInfoGeneratorBuilder(new JcaDigestCalculatorProviderBuilder().build()) | ||
| .build(contentSigner, (X509Certificate) certificates[0])); | ||
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| CollectionStore certStore = new JcaCertStore(Arrays.asList(certificates)); | ||
| generator.addCertificates(certStore); | ||
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| byte[] contentBytes = content.readAllBytes(); | ||
| CMSProcessableByteArray cmsData = new CMSProcessableByteArray(contentBytes); | ||
| CMSSignedData signedData = generator.generate(cmsData, false); | ||
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| return signedData.getEncoded(); | ||
| } | ||
| } |
10 changes: 10 additions & 0 deletions
10
...c/main/java/fr/dossierfacile/api/pdfgenerator/service/interfaces/PdfSignatureService.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,10 @@ | ||
| package fr.dossierfacile.api.pdfgenerator.service.interfaces; | ||
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| import org.apache.pdfbox.pdmodel.PDDocument; | ||
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| import java.io.ByteArrayOutputStream; | ||
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| public interface PdfSignatureService { | ||
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| void signAndSave(PDDocument document, ByteArrayOutputStream baos) throws Exception; | ||
| } |
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