import os
import  json
import requests # pip install requests

# The authentication key (API Key).
# Get your own by registering at https://app.pdf.co
API_KEY = "****************************************************"

# Base URL for PDF.co Web API requests
BASE_URL = "https://api.pdf.co/v1"

### STEP 1: GENERATE BARCODE ###

# Result file name
ResultFile = ".\\barcode.png"
# Barcode type. See valid barcode types in the documentation https://apidocs.pdf.co
BarcodeType = "Code128"
# Barcode value
BarcodeValue = "qweasd123456"

# Barcode Source File
SourceFile = ResultFile


def main(args = None):
    # Generate Barcode
    generateBarcode(ResultFile)   

    # Upload Barcode to Cloud 
    uploadedBarcodeUrl = uploadFile(SourceFile)
    
    # Convert HTML to PDF
    GeneratePDFFromHtml(SampleHtml, DestinationFile)
    
    # Upload PDF to Cloud
    uploadedPdfUrl = uploadFile(SourcePdfFile)

    # PDF with Barcode Output
    addImageToExistingPdf(uploadedPdfUrl, uploadedBarcodeUrl, DestinationFile)



def generateBarcode(destinationFile):
    """Generates Barcode using PDF.co Web API"""

    # Prepare requests params as JSON
    # See documentation: https://apidocs.pdf.co
    parameters = {}
    parameters["name"] = os.path.basename(destinationFile)
    parameters["type"] = BarcodeType
    parameters["value"] = BarcodeValue

    # Prepare URL for 'Barcode Generate' API request
    url = "{}/barcode/generate".format(BASE_URL)

    # Execute request and get response as JSON
    response = requests.post(url, data=parameters, headers={ "x-api-key": API_KEY })
    if (response.status_code == 200):
        json = response.json()

        if json["error"] == False:
            #  Get URL of result file
            resultFileUrl = json["url"]            
            # Download result file
            r = requests.get(resultFileUrl, stream=True)
            if (r.status_code == 200):
                with open(destinationFile, 'wb') as file:
                    for chunk in r:
                        file.write(chunk)
                #print(f"Result file saved as \"{destinationFile}\" file.")
            else:
                print(f"Request error: {response.status_code} {response.reason}")
        else:
            # Show service reported error
            print(json["message"])
    else:
        print(f"Request error: {response.status_code} {response.reason}")


### STEP 2: UPLOAD FILE AS TEMPORARY FILE ###



def uploadFile(fileName):
    """Uploads file to the cloud"""
    
    # 1. RETRIEVE PRESIGNED URL TO UPLOAD FILE.

    # Prepare URL for 'Get Presigned URL' API request
    url = "{}/file/upload/get-presigned-url?contenttype=application/octet-stream&name={}".format(
        BASE_URL, os.path.basename(fileName))
    
    # Execute request and get response as JSON
    response = requests.get(url, headers={ "x-api-key": API_KEY })
    if (response.status_code == 200):
        json = response.json()
        
        if json["error"] == False:
            # URL to use for file upload
            uploadUrl = json["presignedUrl"]
            # URL for future reference
            uploadedFileUrl = json["url"]

            # 2. UPLOAD FILE TO CLOUD.
            with open(fileName, 'rb') as file:
                requests.put(uploadUrl, data=file, headers={ "x-api-key": API_KEY, "content-type": "application/octet-stream" })

            return uploadedFileUrl
        else:
            # Show service reported error
            print(json["message"])    
    else:
        print(f"Request error: {response.status_code} {response.reason}")

    return None


### STEP 3: CONVERT HTML TO PDF ###


# HTML template
file_read = open(".\\sample.html", mode='r', encoding= 'utf-8')
SampleHtml = file_read.read()
file_read.close()

# Destination PDF file name
DestinationFile = ".\\result.pdf"


def GeneratePDFFromHtml(SampleHtml, destinationFile):
    """Converts HTML to PDF using PDF.co Web API"""

    # Prepare requests params as JSON
    # See documentation: https://apidocs.pdf.co/?#1-json-pdfconvertfromhtml
    parameters = {}

    # Input HTML code to be converted. Required.
    parameters["html"] = SampleHtml

    #  Name of resulting file
    parameters["name"] = os.path.basename(destinationFile)

    # Set to css style margins like 10 px or 5px 5px 5px 5px.
    parameters["margins"] = "5px 5px 5px 5px"

    # Can be Letter, A4, A5, A6 or custom size like 200x200
    parameters["paperSize"] = "Letter"

    # Set to Portrait or Landscape. Portrait by default.
    parameters["orientation"] = "Portrait"

    # true by default. Set to false to disable printing of background.
    parameters["printBackground"] = "true"

    # If large input document, process in async mode by passing true
    parameters["async"] = "false"

    # Set to HTML for header to be applied on every page at the header.
    parameters["header"] = ""

    # Set to HTML for footer to be applied on every page at the bottom.
    parameters["footer"] = ""

    # Prepare URL for 'HTML To PDF' API request
    url = "{}/pdf/convert/from/html".format(
        BASE_URL
    )

    # Execute request and get response as JSON

    response = requests.post(url, data=parameters, headers={ "x-api-key": API_KEY })
    if (response.status_code == 200):
        json = response.json()

        if json["error"] == False:
            #  Get URL of result file
            resultFileUrl = json["url"]            
            # Download result file
            r = requests.get(resultFileUrl, stream=True)
            if (r.status_code == 200):
                with open(destinationFile, 'wb') as file:
                    for chunk in r:
                        file.write(chunk)
                #print(f"Result file saved as \"{destinationFile}\" file.")
            else:
                print(f"Request error: {response.status_code} {response.reason}")
        else:
            # Show service reported error
            print(json["message"])
    else:
        print(f"Request error: {response.status_code} {response.reason}")


### STEP 4: UPLOAD PDF AS TEMPORARY FILE ###


# Source PDF file
SourcePdfFile = DestinationFile


### STEP 5: ADD BARCODE TO PDF ###


# Destination PDF file name
DestinationFile = ".//result.pdf"

# Image params
Type = "image"
X = 400
Y = 20
Width = 150
Height = 50

def addImageToExistingPdf(PdfUrl, barcodeUrl, destinationFile):
    import json
    """Add image using PDF.co Web API"""

    # Prepare requests params as JSON
    # See documentation: https://apidocs.pdf.co
    payload = json.dumps({
        "name": os.path.basename(destinationFile),
        "url": PdfUrl,
        "images": [{
            "url": barcodeUrl,
            "x": X,
            "y": Y,
            "width": Width,
            "height": Height
        }]
    })

    # Prepare URL for 'PDF Edit' API request
    url = "{}/pdf/edit/add".format(BASE_URL)

    # Execute request and get response as JSON
    response = requests.post(url, data=payload, headers={ "x-api-key": API_KEY })
    if (response.status_code == 200):
        json = response.json()

        if json["error"] == False:
            #  Get URL of result file
            resultFileUrl = json["url"]            
            # Download result file
            r = requests.get(resultFileUrl, stream=True)
            if (r.status_code == 200):
                with open(destinationFile, 'wb') as file:
                    for chunk in r:
                        file.write(chunk)
                print(f"Result file saved as \"{destinationFile}\" file.")
            else:
                print(f"Request error: {response.status_code} {response.reason}")
        else:
            # Show service reported error
            print(json["message"])
    else:
        print(f"Request error: {response.status_code} {response.reason}")

if __name__ == '__main__':
    main()

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" lang="" xml:lang="">

<head>
	<title>TODO List</title>
	<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
</head>

<body>
	<h1>TODO List</h1>
	<ul>
		<li>
			Wash the car
		</li>
		<li>
			Do the dishes
		</li>
		<li>
			Walk the dog
		</li>
		<li>
			Buy A4 papers
		</li>
	</ul>
</body>

</html>