Create set of APIs to e-sign a PDF using Flask/Python

API/process 1.

1. take a html template, write cv
2. using pypdf generate pdf
3. store pdf

API/process 2.

1. create a new process, which takes signature and sign that PDF

------------sample code-------------- from flask import Flask, jsonify, request import subprocess from PyPDF2 import PdfReader, PdfWriter import os

app = Flask(name)

@app.route('/generate_certificate', methods=['GET']) def generate_certificate(): try: # Signer details signer_common_name = 'Your Name' signer_organization = 'Your Organization' signer_organization_unit = 'Your Organization Unit' signer_locality = 'Your Locality' signer_state = 'Your State' signer_country = 'Your Country Code'

    # Generate private key
    subprocess.call(['openssl', 'genpkey', '-algorithm', 'RSA', '-out', 'private.key'])

    # Generate CSR
    subprocess.call(['openssl', 'req', '-new', '-key', 'private.key', '-out', 'csr.csr', '-subj',
                     '/CN={}/O={}/OU={}/L={}/ST={}/C={}'.format(signer_common_name, signer_organization,
                                                                signer_organization_unit, signer_locality,
                                                                signer_state, signer_country)])

    # Generate self-signed certificate
    subprocess.call(['openssl', 'x509', '-req', '-days', '365', '-in', 'csr.csr', '-signkey', 'private.key',
                     '-out', 'certificate.crt'])

    return jsonify({'message': 'Certificate generated successfully.'}), 200

except Exception as e:
    return jsonify({'error': str(e)}), 500

@app.route('/sign_pdf', methods=['POST']) def sign_pdf(): try: # Get the uploaded PDF file pdf_file = request.files['file'] pdf_data = pdf_file.read()

    # Load the PDF
    pdf = PdfReader(pdf_data)

    # Sign the PDF
    signature_image = 'signature.png'  # Path to the signature image
    output_pdf = 'signed_document.pdf'  # Path to the signed PDF

    for page in pdf.pages:
        page.merge_page(page)

    # Add the signature image to the first page
    signature_page = pdf.pages[0]
    signature_page.add_image(signature_image, x=100, y=100, width=200, height=50)

    # Save the signed PDF
    pdf_writer = PdfWriter()
    for page in pdf.pages:
        pdf_writer.add_page(page)

    with open(output_pdf, 'wb') as output_file:
        pdf_writer.write(output_file)

    # Remove the temporary files
    os.remove('private.key')
    os.remove('csr.csr')
    os.remove('certificate.crt')

    return jsonify({'message': 'PDF signed successfully.'}), 200

except Exception as e:
    return jsonify({'error': str(e)}), 500

if name == 'main': app.run(debug=True)