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[US-342] Update go.mod go version, unipdf version and add writer to m…
…odify contents (unidoc#243) * add example pdf writer modify contents * update go.mod go version to go1.18 and update unipdf version * drop go1.17 version, added support for go1.21 and go1.22
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,130 @@ | ||
| /* | ||
| * Initiate empty PDF Writer, clean the Annots from pages and show analysis for newly created PDF. | ||
| * | ||
| * Run as: go run pdf_modify_contents.go input.pdf output.pdf | ||
| */ | ||
|
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| package main | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "flag" | ||
| "fmt" | ||
| "os" | ||
|
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| "github.com/unidoc/unipdf/v3/common/license" | ||
| "github.com/unidoc/unipdf/v3/core" | ||
| "github.com/unidoc/unipdf/v3/model" | ||
| ) | ||
|
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| 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) | ||
| } | ||
| } | ||
|
|
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| type cmdOptions struct { | ||
| pdfPassword string | ||
| } | ||
|
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| func main() { | ||
| var opt cmdOptions | ||
| flag.StringVar(&opt.pdfPassword, "password", "", "PDF Password (empty default)") | ||
| flag.Parse() | ||
| args := flag.Args() | ||
| if len(args) < 2 { | ||
| fmt.Fprintln(os.Stderr, "Syntax: go run main.go [options] input.pdf output.pdf") | ||
| os.Exit(1) | ||
| } | ||
|
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| inputPath := args[0] | ||
| outputPath := args[1] | ||
| fmt.Printf("Input file: %s\n", inputPath) | ||
|
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| readerOpts := model.NewReaderOpts() | ||
| readerOpts.Password = opt.pdfPassword | ||
|
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| pdfReader, f, err := model.NewPdfReaderFromFile(inputPath, readerOpts) | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
| defer f.Close() | ||
|
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| pdfWriter := model.NewPdfWriter() | ||
|
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| // Removes annotations from each pages. | ||
| numPages, err := pdfReader.GetNumPages() | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
| for i := 0; i < numPages; i++ { | ||
| page, err := pdfReader.GetPage(i + 1) | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
|
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| if page.Annots != nil { | ||
| fmt.Printf("-- Removing Annots on Page %d\n", i+1) | ||
| page.Annots = nil | ||
| } | ||
|
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| err = pdfWriter.AddPage(page) | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
| } | ||
|
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| outDoc := bytes.NewBuffer(nil) | ||
| err = pdfWriter.Write(outDoc) | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
|
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| pdfReader, err = model.NewPdfReader(bytes.NewReader(outDoc.Bytes())) | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
|
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| err = inspectPdf(pdfReader) | ||
| if err != nil { | ||
| fmt.Fprintf(os.Stderr, "Error: %v\n", err) | ||
| os.Exit(1) | ||
| } | ||
|
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| err = os.WriteFile(outputPath, outDoc.Bytes(), 0777) | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
|
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| fmt.Printf("Output file: %s\n", outputPath) | ||
| } | ||
|
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| func inspectPdf(pdfReader *model.PdfReader) error { | ||
| objNums := pdfReader.GetObjectNums() | ||
|
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| // Output. | ||
| fmt.Printf("%d PDF objects:\n", len(objNums)) | ||
| for i, objNum := range objNums { | ||
| obj, err := pdfReader.GetIndirectObjectByNumber(objNum) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| fmt.Println("=========================================================") | ||
| fmt.Printf("%3d: %d 0 %T\n", i, objNum, obj) | ||
| if stream, is := obj.(*core.PdfObjectStream); is { | ||
| decoded, err := core.DecodeStream(stream) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| fmt.Printf("Decoded:\n%s\n", decoded) | ||
| } else if indObj, is := obj.(*core.PdfIndirectObject); is { | ||
| fmt.Printf("%T\n", indObj.PdfObject) | ||
| fmt.Printf("%s\n", indObj.PdfObject.String()) | ||
| } | ||
| } | ||
|
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||
| return nil | ||
| } |
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