如何使用python/django在PDF中添加数字签名或签名图像？

pip install PyPDF2
pip install reportlab

import PyPDF2
from reportlab.lib.pagesizes import letter
from reportlab.pdfgen import canvas

output_pdf = "signed_pdf.pdf"
input_pdf = "original_pdf.pdf"

output = PyPDF2.PdfFileWriter()
input_file = PyPDF2.PdfFileReader(open(input_pdf, "rb"))

page = input_file.getPage(0)
output.addPage(page)

c = canvas.Canvas("signature.pdf", pagesize=letter)
c.drawString(100, 100, "Your Signature")  # 绘制文本签名
# 或者
c.drawImage("signature_image.png", 100, 100, width=100, height=100)  # 绘制图像签名
c.save()

signature = PyPDF2.PdfFileReader(open("signature.pdf", "rb"))
output.getPage(0).mergePage(signature.getPage(0))

with open(output_pdf, "wb") as f:
    output.write(f)