signintech / pdft

Creating PDF using existing PDF as template for GO (golang).

PDFT

PDFT is a GO library for creating PDF documents using existing PDFs as template. This library depend on gopdf.

Tested with PDF template files created from Libre office, Google Docs, Microsoft Word.

SAMPLE

var pt pdft.PDFt
err := pt.Open(pdfsource)
if err != nil {
	panic("Couldn't open pdf.")
}


err = pt.AddFont("arial", "./arial.ttf")
if err != nil {
    t.Error(err)
    return
}

err = pt.SetFont("arial", "", 14)
if err != nil {
    panic(err) 
}

//insert text to pdf
err = pt.Insert("Hi", 1, 10, 10, 100, 100, gopdf.Center|gopdf.Bottom, nil)
if err != nil {
    panic(err) 
}

// insert text to pdf with color
err = pt.Insert("Hi", 1, 10, 10, 100, 100, gopdf.Center|gopdf.Bottom, &FontColor{R: 255, G: 255, B: 255})
if err != nil {
    panic(err) 
}

// measure text width
var textWidth float64
textWidth, err = pt.MeasureTextWidth("Hi")

// read image file
pic, err := ioutil.ReadFile(picPath)
if err != nil {
	panic("Couldn't read pic.")
}

 
// insert image to pdf
err = pt.InsertImg(pic, 1, 182.0, 165.0, 172.0, 49.0)
if err != nil {
	panic("Couldn't insert image")
}

// insert image to pdf with cache, avoiding redundant data when inserting same images many times
err = pt.InsertImgWithCache(pic, 1, 182.0, 165.0, 172.0, 49.0)
if err != nil {
	panic("Couldn't insert image")
}

// Duplicate first page to last page
err = pt.DuplicatePageAfter(1, -1)
if err != nil {
	panic("Couldn't duplicate first page")
}

// Remove second page
err = pt.RemovePage(2)
if err != nil {
	panic("Couldn't remove targetPage")
}

err = pt.Save(target)
if err != nil {
	panic("Couldn't save pdf.")
}

pdft's Issues

Pdf data text length

Text data only filling a portion of the generated pdf, about 50% of the page width regardless of the align value passed in the insert function.

"bad obj properties" when saving PDF

After I've added an image.

unable to insert image in a fillable pdf

when trying to open a pdf containing form fields it is showing me an error "trailer not found", i have tried to insert image even in a normal pdf and i got the output pdf but the format of output pdf has changed, so this library is altering or changing the format of the input pdf.

not found /Resources in /Type/Pages when trying to save PDF

when i try to insert text into a specific pdf, the save function errors out with "panic: not found /Resources in /Type/Pages" . But other PDF's are working, this specific one is not. Any idea why and how to fix it?

Unable to add image to certain pages

I can only insert image to the first page.

When i set the page to 2 the page will not have the image on it but the first one will work

pdf.InsertImg(imgBody, 2, float64(10), float64(10), float64(100), float64(100))

Adding a new page

Hey!
Is there a way to add a new page to a loaded PDF?

Thanks

save out pdf errors

func (c *crawlResultFonts) parse(propVal *[]byte) error {
var props PDFObjPropertiesData
err := readProperties(propVal, &props)
if err != nil {
return err
}

for _, prop := range props {
	var crFont crawlResultFont
	fontIndex, err := strconv.Atoi(strings.TrimSpace(strings.Replace(prop.key, "F", "", -1)))
	//fontIndex, err := strconv.Atoi(strings.TrimSpace(strings.Replace(strings.Replace(prop.key, "C", "", -1), "_", "", -1)))
	if err != nil {
		fmt.Println(err.Error(), "strconv.Atoi fontIndex", prop.key)
		return err
	}
	objID, _, err := prop.asDictionary()
	if err != nil {
		return err
	}
	crFont.fontIndex = fontIndex
	crFont.fontObjID = objID
	*c = append(*c, crFont)
}
return nil

}

crawl_result_font error at line 21

error = strconv.Atoi: parsing "f-0-0": invalid syntax

Insert text is not working

That is my code below. However the text is not showing. The image is showing properly.
Any help? Thanks.

func main() {
	var pt pdft.PDFt
	err := pt.Open("abc.pdf")
	if err != nil {
		panic("Couldn't open pdf.")
	}

	err = pt.AddFont("arial", "./arial.ttf")
	if err != nil {
		fmt.Println(err)
		return
	}

	err = pt.SetFont("arial", "", 14)
	if err != nil {
		panic(err)
	}

	err = pt.Insert("Hello World", 1, 100, 100, 100, 100, gopdf.Center|gopdf.Bottom)
	if err != nil {
		panic(err)
	}

	//read image file
	// pic, err := ioutil.ReadFile("./testlb.png")
	// if err != nil {
	// 	panic("Couldn't read pic.")
	// }

	//insert image to pdf
	// err = pt.InsertImg(pic, 1, 100, 100, 172.0, 49.0)
	// if err != nil {
	// 	panic("Couldn't insert image")
	// }

	pt.Save("hello.pdf")
}

GUI editor

This allows to create a pdf editor because the library allows modifying existing PDF's. Great work !

Is anyone working on making a GUI ?
I think it would not be a huge effort now.

I assume I can just display as an image in the GUI and collect the additions by the users in another image layer. Can the lib return to me a image of a pdf ?

Insert Text becomes upside down

I followed the example given but produce this error. Anyone have similar problem?

err = pt.AddFont("arial", "./arial.ttf")
if err != nil {
return err
}

err = pt.SetFont("arial", "", 14)
if err != nil {
return err
}

//insert text to pdf
err = pt.Insert(fullname, 1, 100, 100, 100, 100, pdft.Regular)
if err != nil {
return err
}

Can I Add page from another pdf into current pdf object

Can I Add page from another pdf into current pdf object?

น่าจะเข้าใจภาษาไทย ขออนุญาติพิมพ์เป็นไทย ผมจะสามารถเพิ่มหน้าใหม่เข้ามาได้มั๊ยครับ เช่น จะทำใบเสร็จรับเงิน แต่อาจจะมี 2 แผ่น หรือ 3 แผ่น สามารถทำได้มั๊ยครับ

he result of image is mirroring images

i have issue while use

err = pt.InsertImg(pic, 1, 370.0, 635.0, 96.0, 39.0)

in golang, the result of image is mirroring images

PDFs with missing trailers are entirely rejected

Some PDFs, such as https://transition.fcc.gov/Forms/Form740/740.pdf, which appear to render fine in all the readers I've tried, are rejected by pdft with the error 'Failure trailer not found'. The PDF is certainly missing the trailer component, but I'm not sure if this makes them entirely invalid.

Library is slow

I am using this code to insert a text into the file:

	var pt pdft.PDFt
	if err := pt.Open("./player-id-template.pdf"); err != nil {
		return "", err
	}

	if err := pt.AddFont("avenir", "./player-id-font.ttf"); err != nil {
		return "", err
	}

	if err := pt.SetFont("avenir", "", 60); err != nil {
		return "", err
	}

	// These numbers have been found by experimenting with PDF template
	// This PDF template will remain always the same
	if err := pt.Insert(id, 1, 0, 525, 510, 100, gopdf.Middle|gopdf.Center); err != nil {
		return "", err
	}

	if err := pt.Save(fileName); err != nil {
		return "", err
	}

It ttakes on average 1.5s to run. Do you know what can be the reason?

I found that pt.Open takes most of the time.

Find and Replace Text

Cant seem to find a way to search a PDF for Text and replace it.

DO you think its possible i could add it and make a PR ?

Hi I can't fix this bug

This is my code

package main

import (
	"fmt"
	"io/ioutil"

	"github.com/signintech/pdft"
)

func main() {

	target := "out_pdf.pdf"
	pdfsource := "Bussiness.pdf"
	picPath :=  "17.jpg"

	var ipdf pdft.PDFt
	err := ipdf.Open(pdfsource)
	if err != nil {
		panic(err)
	}

	pic, err := ioutil.ReadFile(picPath)
	if err != nil {
		panic("Couldn't read pic.")
	}

	//insert image to pdf
	err = ipdf.InsertImg(pic, 1, 1.0, 1.0, 600.0, 600.0)
	if err != nil {
		panic("Couldn't insert image")
	}

	err = ipdf.Save(target)
	if err != nil {
		fmt.Println(err)
		panic("Couldn't save pdf.")
	}
}

not found /Resources in /Type/Pages
panic: Couldn't save pdf.

goroutine 1 [running]:
main.main()
	/Users/pathbox/code/learning-go/src/pdf-power/pdft-example.go:36 +0x1bf
exit status 2

Can you help me

Duplicate pdf

Duplicating the same page multiple times stops working after several times.

E.g. I need to copy the page 10 times, and after the 7th page added it stops working, no matter how often I call the function

Setting text color

Would it be possible to add text color when inserting text onto the PDF file?

I think as of the moment only black color is supported, but upon checking on gopdf they do have a support for changing text color using RGB Color model. https://github.com/signintech/gopdf?tab=readme-ov-file#set-text-color-using-rgb-color-model

Is there any workaround how to do this to pdft? Or will there be an update to implement it? Thank you.

Insert text error

err = ipdf.Insert("abcdefg", 1, 30, 20, 100, 100, gopdf.Center|gopdf.Bottom)
if err != nil {
	panic(err)
}

when I insert data abcdefg, The pdf display with DEFGHIJ, I have no idea

Unable to import PDF exported from browsers (Chromium/Firefox/Blink/Gecko)

Hello, I'm unable to import PDFs that have been exported from browsers.

It works completely fine when importing PDFs exported from jung-kurt/gofpdf, but if I try to import a PDF exported from Chromium or Firefox, then I get this error: trailer not found.

pdft version: v0.4.2

Some example on how to use pdft please

It would be awesome to get some example on how to use pdft. A simple example will do.

trailer regex failed

ishmeets@ishmeets-mbp pdft % go run main.go 
trailer not found
panic: Couldn't open pdf.

goroutine 1 [running]:
main.main()
	/Users/ishmeets/workspace/pdf/pdft/main.go:15 +0x1dc
exit status 2

PDF:
Get_Started_With_Smallpdf.pdf

inserting on 2nd page seems to corrupt data

This library has been very nice, inserting data on the first page works great, but I have had some issues when inserting data on the second page of the pdf.

I was originally trying to insert images onto the second page, but after executing the program, no images are outputted. I tried to insert them onto the first page, and that worked as expected.

This made me curious, so I tried to insert some text onto the second page and something weird happened

when I do something like

    size, err := pt.MeasureTextWidth("hello")
    if err != nil {
        return err
    }
    err = pt.Insert("hello", 2, 0, 0, size, 100, gopdf.Center|gopdf.Bottom)
    if err != nil {
        return err
    }

The text is inserted in the correct place, but the text that is inserted is "K H O O R" and not "hello".

Note: the second page exists when loading the pdf, but is completely blank before any insertions, could this be the problem?

[Question] Remove or Find & Replace Text

Is it possible to Remove or Find & Replace Text in existing PDF file?

Insert image doesn't work

Hi I'm trying to insert a png image to pdf without success:

    var ipdf pdft.PDFt
err := ipdf.Open(source)
if err != nil {
	panic("Couldn't open pdf.")
}

payload, err := ioutil.ReadFile(signature)
if err != nil {
	panic("Couldn't read signature.")
}

encoded := base64.StdEncoding.EncodeToString(payload)
fmt.Println(encoded)

err = ipdf.InsertImgBase64(encoded, 1, 182.0, 165.0, 172.0, 49.0)
if err != nil {
	panic("Couldn't insert image")
}

err = ipdf.Save(target)
if err != nil {
	panic("Couldn't save pdf.")
}

Fail spliting Font

Hi,

Debugging an error in a try of this module, I found that in file crawl_result_font.go, the function splitFont fail in strconv.Atoi(s[i:]), been s[i:] = "T1_0"

I shared an image showing the error

Regards