merge_app.py

from flask import Flask,jsonify,send_from_directory
from flask_restful import Api,Resource,reqparse
import werkzeug
from PyPDF2 import PdfFileMerger
import os

app = Flask(__name__)
app.config["CLIENT_PDF"] = '/home/****USERNAME GOES HERE****/appscript/'
api = Api(app)

class Mergy(Resource):
	def post(self,result_name):
		base_dir = '/home/****USERNAME GOES HERE****/appscript/'
		pdf_directory = '/home/****USERNAME GOES HERE****/appsript/pdfs/'
		parse = reqparse.RequestParser()
		parse.add_argument('files', type=werkzeug.datastructures.FileStorage, location='files',required=True, action='append')
		parse.add_argument('Total-Files', location='headers')
		parse.add_argument('Index', location='headers')
		args = parse.parse_args()
		index = args['Index']
		total_files = args['Total-Files']
		if index<total_files:
			if index == '1.0':
				old_pdfs = [f for f in os.listdir(base_dir) if os.path.isfile(os.path.join(base_dir, f)) and f.endswith('.pdf')]
				if old_pdfs:
					for x in old_pdfs:
						os.system(f'rm {x}')
				try:
					os.system('rm -r /home/****USERNAME GOES HERE****/appsript/pdfs')
					os.system('mkdir /home/****USERNAME GOES HERE****/appscript/pdfs')
				except:
					os.system('mkdir /home/****USERNAME GOES HERE****/appscript/pdfs')
			for arg in args['files']:
				filename = f'{index}.pdf'
				filepath = f'{pdf_directory}{filename}'
				arg.save(str(filepath))
			return jsonify('success')
		else:
			for arg in args['files']:
				filename = f'{index}.pdf'
				filepath = f'{pdf_directory}{filename}'
				arg.save(str(filepath))
			pdfs = [f for f in os.listdir(pdf_directory) if os.path.isfile(os.path.join(pdf_directory, f))]
			pdfs.sort()
			merger = PdfFileMerger()
			for pdf in pdfs:
				filepath = f'{pdf_directory}{pdf}'
				merger.append(str(filepath))
			output = f'{result_name}.pdf'
			merger.write(output)
			merger.close()
			output = output.replace('.pdf','')
			return jsonify(output)

	def get(self,result_name):
		base_dir = '/home/****USERNAME GOES HERE****/appscript/'
		filename = f'{result_name}.pdf'
		return send_from_directory(app.config["CLIENT_PDF"], filename=filename, mimetype='application/pdf',as_attachment=True)

api.add_resource(Mergy, '/<string:result_name>')

app.run(host="0.0.0.0", port=4000)