Downloads Contract Code from etherscan.io (works for all *nets) given the deployed url.

contractDownloader.py

#!/usr/bin/env python3

# Usage: ./contractDownloader.py -u https://etherscan.io/address/0x0f51bb10119727a7e5ea3538074fb341f56b09ad#code
# Usage: ./contractDownloader.py -u https://kovan.etherscan.io/address/0x7b6b10caa9e8e9552ba72638ea5b47c25afea1f3#code

import os
import bs4
import sys
import argparse
import requests

headers = {"User-Agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:86.0) Gecko/20100101 Firefox/86.0"}

def getAddressAndUrl(url):
	contractAddress = url.split("/")[-1][:42]

	if "etherscan.io/token/" in url.lower():
		return contractAddress, url.lower().replace('etherscan.io/token/', 'etherscan.io/address/')
	return contractAddress, url

def fetchEtherScanCodePage(contractAddress, url):
	res = requests.get(url, headers=headers)
	soup = bs4.BeautifulSoup(res.text, features="html.parser")
	pre = soup.find("pre", {"id":"js-copytextarea2"})
	filenames = []
	for source in soup.select('[id^="panel-sourcecode"]'):
		span = source.parent.parent.next
		filename = span.text
		if "File " in filename:
			filename = filename.split(":")[-1].strip(" ")
		
		filenames.append(filename)
	try:
		os.mkdir(f"./{contractAddress}")
	except:
		pass

	i = 0
	for source in soup.select('[id^="editor"]'):
		filename = filenames[i]
		print(f"Downloading ./{contractAddress}/{filename}...")
		with open(f'./{contractAddress}/{filename}','w') as f:
			f.write(source.text)
		
		i+=1

if __name__ == "__main__":
	parser = argparse.ArgumentParser("Etherscan Contract Code downloader...")
	parser.add_argument("-u","--url", required=True, help="Etherscan URL for contract")

	args = parser.parse_args()

	contractAddress, url = getAddressAndUrl(args.url)
	fetchEtherScanCodePage(contractAddress, url)