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Prepare examples for rc-v3.29.0 (#164)
* Add more advanced text search and replace example * Added a new example with the signing document twice. It works with a previously signed document. * Added a new example with signing an encrypted document. * Fix naming * return license check * fix permissions for write file * update modules etc * fix for compatibility Co-authored-by: Adrian-George Bostan <adrg@epistack.com> Co-authored-by: Fizz <diku55@mail.ru>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,233 @@ | ||
| /* | ||
| * This example showcases how to append a new page with signature to a PDF document. | ||
| * The file is signed using a private/public key pair. | ||
| * | ||
| * $ ./pdf_sign_encrypted_pdf <INPUT_PDF_PATH> <OUTPUT_PDF_PATH> | ||
| */ | ||
| package main | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "crypto/rand" | ||
| "crypto/rsa" | ||
| "crypto/x509" | ||
| "crypto/x509/pkix" | ||
| "fmt" | ||
| "github.com/unidoc/unipdf/v3/common/license" | ||
| "github.com/unidoc/unipdf/v3/core/security" | ||
| "io/ioutil" | ||
| "log" | ||
| "math/big" | ||
| "os" | ||
| "time" | ||
|
|
||
| "github.com/unidoc/unipdf/v3/annotator" | ||
| "github.com/unidoc/unipdf/v3/core" | ||
| "github.com/unidoc/unipdf/v3/model" | ||
| "github.com/unidoc/unipdf/v3/model/sighandler" | ||
| ) | ||
|
|
||
| func init() { | ||
| //Make sure to load your metered License API key prior to using the library. | ||
| //If you need a key, you can sign up and create a free one at https://cloud.unidoc.io | ||
| err := license.SetMeteredKey(os.Getenv(`UNIDOC_LICENSE_API_KEY`)) | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
| } | ||
|
|
||
| func main() { | ||
| args := os.Args | ||
| if len(args) < 3 { | ||
| log.Fatalln("Usage: go run pdf_sign_encrypted_pdf INPUT_PDF_PATH OUTPUT_PDF_PATH") | ||
| } | ||
|
|
||
| inputPath := args[1] | ||
| outputPath := args[2] | ||
|
|
||
| // Read the original file. | ||
| f, err := os.Open(inputPath) | ||
| if err != nil { | ||
| log.Fatalf("Fail: %v\n", err) | ||
| } | ||
| defer f.Close() | ||
|
|
||
| pdfReader, err := model.NewPdfReader(f) | ||
| if err != nil { | ||
| log.Fatalf("Fail: %v\n", err) | ||
| } | ||
|
|
||
| password := "password" | ||
|
|
||
| permissions := security.PermPrinting | // Allow printing with low quality | ||
| security.PermFullPrintQuality | | ||
| security.PermModify | // Allow modifications. | ||
| security.PermAnnotate | // Allow annotations. | ||
| security.PermFillForms | | ||
| security.PermRotateInsert | // Allow modifying page order, rotating pages etc. | ||
| security.PermExtractGraphics | // Allow extracting graphics. | ||
| security.PermDisabilityExtract // Allow extracting graphics (accessibility) | ||
|
|
||
| encryptOptions := &model.EncryptOptions{ | ||
| Permissions: permissions, | ||
| Algorithm: model.AES_128bit, | ||
| } | ||
|
|
||
| // Ecnrypt document | ||
| buf, err := encryptDocument(pdfReader, password, encryptOptions) | ||
| if err != nil { | ||
| log.Fatalf("Fail: %v\n", err) | ||
| } | ||
|
|
||
| readerOpts := model.NewReaderOpts() | ||
| readerOpts.Password = password | ||
|
|
||
| // Open reader for the signed document | ||
| pdfReader, err = model.NewPdfReaderWithOpts(bytes.NewReader(buf), readerOpts) | ||
| if err != nil { | ||
| log.Fatalf("Fail: %v\n", err) | ||
| } | ||
|
|
||
| // Create appender. | ||
| pdfAppender, err := model.NewPdfAppenderWithOpts(pdfReader, readerOpts, encryptOptions) | ||
| if err != nil { | ||
| log.Fatalf("Fail: %v\n", err) | ||
| } | ||
|
|
||
| // Add signature | ||
| buf, err = addSignature(pdfAppender, 1) | ||
| if err != nil { | ||
| log.Fatalf("Fail: %v\n", err) | ||
| } | ||
|
|
||
| // Write the resulting file to output.pdf file. | ||
| err = ioutil.WriteFile(outputPath, buf, 0666) | ||
| if err != nil { | ||
| log.Fatalf("Fail: %v\n", err) | ||
| } | ||
| log.Printf("PDF file successfully saved to output path: %s\n", outputPath) | ||
|
|
||
| fmt.Println("Done") | ||
| } | ||
|
|
||
| func encryptDocument(pdfReader *model.PdfReader, password string, encryptOptions *model.EncryptOptions) ([]byte, error) { | ||
| pdfWriter, err := pdfReader.ToWriter(nil) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| // Encrypt document before writing to file. | ||
| err = pdfWriter.Encrypt([]byte(password), []byte(password), encryptOptions) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| buf := &bytes.Buffer{} | ||
| // Write output PDF file. | ||
| if err = pdfWriter.Write(buf); err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| log.Println("PDF file successfully encrypted") | ||
|
|
||
| return buf.Bytes(), nil | ||
| } | ||
|
|
||
| func addSignature(pdfAppender *model.PdfAppender, pageNum int) ([]byte, error) { | ||
| // Generate key pair. | ||
| priv, cert, err := generateSigKeys() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| // Create signature handler. | ||
| handler, err := sighandler.NewAdobePKCS7Detached(priv, cert) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| // Create signature. | ||
| signature := model.NewPdfSignature(handler) | ||
| signature.SetName("Test Signature Appearance Name") | ||
| signature.SetReason("TestSignatureAppearance Reason") | ||
| signature.SetDate(time.Now(), "") | ||
|
|
||
| // Initialize signature. | ||
| if err := signature.Initialize(); err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| opts := annotator.NewSignatureFieldOpts() | ||
| opts.FontSize = 8 | ||
| opts.Rect = []float64{float64(50), 250, float64(150), 300} | ||
| opts.TextColor = model.NewPdfColorDeviceRGB(255, 0, 0) | ||
|
|
||
| sigField, err := annotator.NewSignatureField( | ||
| signature, | ||
| []*annotator.SignatureLine{ | ||
| annotator.NewSignatureLine("Name", "John Doe"), | ||
| annotator.NewSignatureLine("Date", "2019.03.14"), | ||
| annotator.NewSignatureLine("Reason", fmt.Sprintf("Test sign")), | ||
| annotator.NewSignatureLine("Location", "London"), | ||
| annotator.NewSignatureLine("DN", "authority2:name2"), | ||
| }, | ||
| opts, | ||
| ) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| sigField.T = core.MakeString(fmt.Sprintf("New Page Signature")) | ||
|
|
||
| if err = pdfAppender.Sign(pageNum, sigField); err != nil { | ||
| log.Fatalf("Fail: %v\n", err) | ||
| } | ||
|
|
||
| buf := &bytes.Buffer{} | ||
| // Write output PDF file. | ||
| if err = pdfAppender.Write(buf); err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| log.Println("PDF file successfully signed") | ||
|
|
||
| return buf.Bytes(), nil | ||
| } | ||
|
|
||
| func generateSigKeys() (*rsa.PrivateKey, *x509.Certificate, error) { | ||
| var now = time.Now() | ||
|
|
||
| // Generate private key. | ||
| priv, err := rsa.GenerateKey(rand.Reader, 2048) | ||
| if err != nil { | ||
| return nil, nil, err | ||
| } | ||
|
|
||
| // Initialize X509 certificate template. | ||
| template := x509.Certificate{ | ||
| SerialNumber: big.NewInt(1), | ||
| Subject: pkix.Name{ | ||
| CommonName: "any", | ||
| Organization: []string{"Test Company"}, | ||
| }, | ||
| NotBefore: now.Add(-time.Hour), | ||
| NotAfter: now.Add(time.Hour * 24 * 365), | ||
|
|
||
| KeyUsage: x509.KeyUsageDigitalSignature, | ||
| ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth}, | ||
| BasicConstraintsValid: true, | ||
| } | ||
|
|
||
| // Generate X509 certificate. | ||
| certData, err := x509.CreateCertificate(rand.Reader, &template, &template, priv.Public(), priv) | ||
| if err != nil { | ||
| return nil, nil, err | ||
| } | ||
|
|
||
| cert, err := x509.ParseCertificate(certData) | ||
| if err != nil { | ||
| return nil, nil, err | ||
| } | ||
|
|
||
| return priv, cert, nil | ||
| } |
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