Awesome
gofpdi
Go Free PDF Document Importer
gofpdi allows you to import an existing PDF into a new PDF. The following PDF generation libraries are supported:
Acknowledgments
This package’s code is derived from the fpdi library created by Jan Slabon.
mrtsbt added support for reading a PDF from an io.ReadSeeker
stream and also added support for using gofpdi concurrently. Asher Tuggle added support for reading PDFs that have split xref tables.
Examples
gopdf example
package main
import (
"github.com/signintech/gopdf"
"io"
"net/http"
"os"
)
func main() {
var err error
// Download a Font
fontUrl := "https://github.com/google/fonts/raw/master/ofl/daysone/DaysOne-Regular.ttf"
if err = DownloadFile("example-font.ttf", fontUrl); err != nil {
panic(err)
}
// Download a PDF
fileUrl := "https://tcpdf.org/files/examples/example_012.pdf"
if err = DownloadFile("example-pdf.pdf", fileUrl); err != nil {
panic(err)
}
pdf := gopdf.GoPdf{}
pdf.Start(gopdf.Config{PageSize: gopdf.Rect{W: 595.28, H: 841.89}}) //595.28, 841.89 = A4
pdf.AddPage()
err = pdf.AddTTFFont("daysone", "example-font.ttf")
if err != nil {
panic(err)
}
err = pdf.SetFont("daysone", "", 20)
if err != nil {
panic(err)
}
// Color the page
pdf.SetLineWidth(0.1)
pdf.SetFillColor(124, 252, 0) //setup fill color
pdf.RectFromUpperLeftWithStyle(50, 100, 400, 600, "FD")
pdf.SetFillColor(0, 0, 0)
pdf.SetX(50)
pdf.SetY(50)
pdf.Cell(nil, "Import existing PDF into GoPDF Document")
// Import page 1
tpl1 := pdf.ImportPage("example-pdf.pdf", 1, "/MediaBox")
// Draw pdf onto page
pdf.UseImportedTemplate(tpl1, 50, 100, 400, 0)
pdf.WritePdf("example.pdf")
}
// DownloadFile will download a url to a local file. It's efficient because it will
// write as it downloads and not load the whole file into memory.
func DownloadFile(filepath string, url string) error {
// Get the data
resp, err := http.Get(url)
if err != nil {
return err
}
defer resp.Body.Close()
// Create the file
out, err := os.Create(filepath)
if err != nil {
return err
}
defer out.Close()
// Write the body to file
_, err = io.Copy(out, resp.Body)
return err
}
Generated PDF: example.pdf
Screenshot of PDF:
gofpdf example #1 - import PDF from file
package main
import (
"github.com/phpdave11/gofpdf"
"github.com/phpdave11/gofpdf/contrib/gofpdi"
"io"
"net/http"
"os"
)
func main() {
var err error
pdf := gofpdf.New("P", "mm", "A4", "")
// Download a PDF
fileUrl := "https://tcpdf.org/files/examples/example_026.pdf"
if err = DownloadFile("example-pdf.pdf", fileUrl); err != nil {
panic(err)
}
// Import example-pdf.pdf with gofpdi free pdf document importer
tpl1 := gofpdi.ImportPage(pdf, "example-pdf.pdf", 1, "/MediaBox")
pdf.AddPage()
pdf.SetFillColor(200, 700, 220)
pdf.Rect(20, 50, 150, 215, "F")
// Draw imported template onto page
gofpdi.UseImportedTemplate(pdf, tpl1, 20, 50, 150, 0)
pdf.SetFont("Helvetica", "", 20)
pdf.Cell(0, 0, "Import existing PDF into gofpdf document with gofpdi")
err = pdf.OutputFileAndClose("example.pdf")
if err != nil {
panic(err)
}
}
// DownloadFile will download a url to a local file. It's efficient because it will
// write as it downloads and not load the whole file into memory.
func DownloadFile(filepath string, url string) error {
// Get the data
resp, err := http.Get(url)
if err != nil {
return err
}
defer resp.Body.Close()
// Create the file
out, err := os.Create(filepath)
if err != nil {
return err
}
defer out.Close()
// Write the body to file
_, err = io.Copy(out, resp.Body)
return err
}
Generated PDF: example.pdf
Screenshot of PDF:
gofpdf example #2 - import PDF from stream
package main
import (
"bytes"
"github.com/phpdave11/gofpdf"
"github.com/phpdave11/gofpdf/contrib/gofpdi"
"io"
"io/ioutil"
"net/http"
)
func main() {
var err error
pdf := gofpdf.New("P", "mm", "A4", "")
// Download a PDF into memory
res, err := http.Get("https://tcpdf.org/files/examples/example_038.pdf")
if err != nil {
panic(err)
}
pdfBytes, err := ioutil.ReadAll(res.Body)
res.Body.Close()
if err != nil {
panic(err)
}
// convert []byte to io.ReadSeeker
rs := io.ReadSeeker(bytes.NewReader(pdfBytes))
// Import in-memory PDF stream with gofpdi free pdf document importer
tpl1 := gofpdi.ImportPageFromStream(pdf, &rs, 1, "/TrimBox")
pdf.AddPage()
pdf.SetFillColor(200, 700, 220)
pdf.Rect(20, 50, 150, 215, "F")
// Draw imported template onto page
gofpdi.UseImportedTemplate(pdf, tpl1, 20, 50, 150, 0)
pdf.SetFont("Helvetica", "", 20)
pdf.Cell(0, 0, "Import PDF stream into gofpdf document with gofpdi")
err = pdf.OutputFileAndClose("example.pdf")
if err != nil {
panic(err)
}
}
Generated PDF:
Screenshot of PDF: