Security and Encryption

// Encryption methods in org.apache.pdfbox.pdmodel.PDDocument
public void encrypt(AccessPermission ap, StandardProtectionPolicy spp) throws IOException;
public boolean isEncrypted();
public void decrypt(String password) throws IOException;
public AccessPermission getCurrentAccessPermission();

// Constructor and methods in org.apache.pdfbox.pdmodel.encryption.AccessPermission
public AccessPermission();
public AccessPermission(int permissions);

// Permission queries
public boolean canPrint();
public boolean canPrintDegraded();
public boolean canModify();
public boolean canModifyAnnotations();
public boolean canFillInForm();
public boolean canExtractContent();
public boolean canExtractForAccessibility();
public boolean canAssembleDocument();

// Permission setters
public void setCanPrint(boolean canPrint);
public void setCanPrintDegraded(boolean canPrintDegraded);
public void setCanModify(boolean canModify);
public void setCanModifyAnnotations(boolean canModifyAnnotations);
public void setCanFillInForm(boolean canFillInForm);
public void setCanExtractContent(boolean canExtractContent);
public void setCanExtractForAccessibility(boolean canExtractForAccessibility);
public void setCanAssembleDocument(boolean canAssembleDocument);

// Permission value
public int getPermissionBytes();
public void setPermissionBytes(int permissions);

// Constructor and methods in org.apache.pdfbox.pdmodel.encryption.StandardProtectionPolicy
public StandardProtectionPolicy(String ownerPassword, String userPassword, AccessPermission permissions);

// Password management
public String getOwnerPassword();
public String getUserPassword();
public AccessPermission getPermissions();

// Encryption configuration
public void setEncryptionKeyLength(int encryptionKeyLength);
public int getEncryptionKeyLength();
public void setPreferAES(boolean preferAES);
public boolean isPreferAES();

// Constructor and methods in org.apache.pdfbox.pdmodel.interactive.digitalsignature.PDSignature
public PDSignature();
public PDSignature(COSDictionary dict);

// Signature information
public String getName();
public void setName(String name);
public Calendar getSignDate();
public void setSignDate(Calendar signDate);
public String getLocation();
public void setLocation(String location);
public String getReason();
public void setReason(String reason);
public String getContactInfo();
public void setContactInfo(String contactInfo);

// Signature data
public byte[] getContents();
public void setContents(byte[] contents);
public int[] getByteRange();
public void setByteRange(int[] byteRange);

// Signature properties
public COSName getFilter();
public void setFilter(COSName filter);
public COSName getSubFilter();
public void setSubFilter(COSName subFilter);

// Signature access in PDDocument
public List<PDSignature> getSignatureDictionaries();
public void addSignature(PDSignature signature) throws IOException;
public void addSignature(PDSignature signature, SignatureInterface signatureInterface) throws IOException;
public void addSignature(PDSignature signature, SignatureInterface signatureInterface, SignatureOptions signatureOptions) throws IOException;

// Signature validation
public boolean verifySignature(PDSignature signature) throws IOException;
public byte[] getSignedContent(PDSignature signature) throws IOException;

// Interface in org.apache.pdfbox.pdmodel.interactive.digitalsignature.SignatureInterface
public byte[] sign(InputStream content) throws IOException;

// Constructor and methods in org.apache.pdfbox.pdmodel.interactive.digitalsignature.SignatureOptions
public SignatureOptions();

// Page and positioning
public void setPage(int page);
public int getPage();
public void setVisualSignature(PDFormXObject visualSignature);
public PDFormXObject getVisualSignature();

// Signature field configuration
public void setPrefferredSignatureSize(int size);
public int getPreferredSignatureSize();

// Methods in org.apache.pdfbox.pdmodel.encryption.SecurityHandler
public void prepareDocumentForEncryption(PDDocument doc) throws IOException;
public void decryptDocument(PDDocument doc, DecryptionMaterial decryptionMaterial) throws IOException;
public AccessPermission getCurrentAccessPermission();
public boolean hasProtectionPolicy();

PDDocument document = Loader.loadPDF(new File("document.pdf"));

// Create access permissions
AccessPermission permissions = new AccessPermission();
permissions.setCanPrint(true);
permissions.setCanModify(false);
permissions.setCanExtractContent(false);
permissions.setCanModifyAnnotations(false);

// Create protection policy
String ownerPassword = "owner123";
String userPassword = "user123";
StandardProtectionPolicy policy = new StandardProtectionPolicy(ownerPassword, userPassword, permissions);

// Configure encryption
policy.setEncryptionKeyLength(256); // AES-256
policy.setPreferAES(true);

// Apply encryption
document.encrypt(permissions, policy);

document.save("encrypted-document.pdf");
document.close();

File file = new File("encrypted-document.pdf");
String password = "user123";

// Load encrypted document with password
PDDocument document = Loader.loadPDF(file, password);

// Check if document is encrypted
if (document.isEncrypted()) {
    System.out.println("Document is encrypted");
    
    // Get current permissions
    AccessPermission permissions = document.getCurrentAccessPermission();
    System.out.println("Can print: " + permissions.canPrint());
    System.out.println("Can modify: " + permissions.canModify());
    System.out.println("Can extract: " + permissions.canExtractContent());
}

// Work with decrypted document
// ...

document.close();

PDDocument document = new PDDocument();
// ... add content to document

// Create restrictive permissions
AccessPermission permissions = new AccessPermission();
permissions.setCanPrint(true);                    // Allow printing
permissions.setCanPrintDegraded(false);           // No degraded printing
permissions.setCanModify(false);                  // No modifications
permissions.setCanModifyAnnotations(true);        // Allow annotation changes
permissions.setCanFillInForm(true);               // Allow form filling
permissions.setCanExtractContent(false);          // No content extraction
permissions.setCanExtractForAccessibility(true);  // Allow accessibility tools
permissions.setCanAssembleDocument(false);        // No page manipulation

// Apply with different user/owner passwords
StandardProtectionPolicy policy = new StandardProtectionPolicy("secret_owner", "public_user", permissions);
document.encrypt(permissions, policy);

document.save("restricted-document.pdf");
document.close();

PDDocument document = Loader.loadPDF(new File("document.pdf"));

// Create signature dictionary
PDSignature signature = new PDSignature();
signature.setName("John Doe");
signature.setLocation("New York, NY");
signature.setReason("I approve this document");
signature.setSignDate(Calendar.getInstance());
signature.setFilter(COSName.getPDFName("Adobe.PPKLite"));
signature.setSubFilter(COSName.getPDFName("adbe.pkcs7.detached"));

// Implement signature interface
SignatureInterface signatureInterface = new SignatureInterface() {
    @Override
    public byte[] sign(InputStream content) throws IOException {
        // Implement actual signing logic here
        // This would typically involve:
        // 1. Reading the content to be signed
        // 2. Creating a digital signature using private key
        // 3. Returning the signature bytes
        return new byte[0]; // Placeholder
    }
};

// Configure signature options
SignatureOptions signatureOptions = new SignatureOptions();
signatureOptions.setPage(0); // Sign on first page

// Add signature to document
document.addSignature(signature, signatureInterface, signatureOptions);

document.save("signed-document.pdf");
document.close();

PDDocument document = Loader.loadPDF(new File("signed-document.pdf"));

// Get all signatures
List<PDSignature> signatures = document.getSignatureDictionaries();

for (PDSignature signature : signatures) {
    System.out.println("Signature by: " + signature.getName());
    System.out.println("Date: " + signature.getSignDate().getTime());
    System.out.println("Location: " + signature.getLocation());
    System.out.println("Reason: " + signature.getReason());
    
    // Get signed content for verification
    byte[] signedContent = document.getSignedContent(signature);
    
    // Verify signature (implementation depends on your security provider)
    boolean isValid = verifySignature(signature, signedContent);
    System.out.println("Signature valid: " + isValid);
}

document.close();

PDDocument document = Loader.loadPDF(new File("encrypted-document.pdf"));

if (document.isEncrypted()) {
    // Access security handler for advanced operations
    SecurityHandler securityHandler = document.getEncryption().getSecurityHandler();
    
    if (securityHandler.hasProtectionPolicy()) {
        System.out.println("Document has protection policy");
        
        // Get current access permissions
        AccessPermission currentPermissions = securityHandler.getCurrentAccessPermission();
        
        // Check specific permissions
        if (!currentPermissions.canExtractContent()) {
            System.out.println("Content extraction is restricted");
        }
    }
}

document.close();