ethereum rpc proxy, to be used as "cheap light node"

ethereum-rpc-proxy.py

import http.server
import requests
import json

class Proxy(http.server.BaseHTTPRequestHandler):
    def do_POST(self):
        data = self.rfile.read(int(self.headers['Content-Length'])).decode('utf-8')
        decodedData = json.loads(data)
        newheaders = {}
        for k, v in self.headers.items():
            if k.lower() in ['host', 'content-length', 'content-encoding']:
                continue
            newheaders[k] = v

        if decodedData['method'] in ['eth_getBalance','eth_gasPrice','eth_call','eth_getBlockByNumber','eth_getTransactionReceipt','eth_blockNumber','eth_getTransactionByHash']:
            r = requests.post('https://cloudflare-eth.com/', data=data, headers=newheaders)
        elif decodedData['method'] in ['personal_sendTransaction']:
            data = json.dumps({"jsonrpc":"2.0","id":2,"method":"eth_getTransactionCount","params":[decodedData['params'][0]['from'], "pending"]})
            print(data)
            r = requests.post('https://cloudflare-eth.com/', data=data, headers=newheaders)
            print(r.json())
            nonce = r.json()['result']
            data = json.dumps({"jsonrpc":"2.0","id":2,"method":"eth_gasPrice","params":[]})
            print(data)
            r = requests.post('https://cloudflare-eth.com/', data=data, headers=newheaders)
            gasprice = r.json()['result']
            print(r.json())
            params1 = {"from":decodedData['params'][0]['from'],"to":decodedData['params'][0]['to'],"value":decodedData['params'][0]['value'],"gas":decodedData['params'][0]['gas'],"gasPrice":gasprice,"nonce":nonce}
            if "data" in decodedData['params'][0]:
                params1["data"] = decodedData['params'][0]['data']
            
            data = json.dumps({"jsonrpc":"2.0","id":2,"method":"personal_signTransaction","params":[params1,decodedData['params'][1]]})
            print(params1)
            r = requests.post('http://127.0.0.1:8545', data=data, headers=newheaders)
            print(r.json())
            data = json.dumps({"jsonrpc":"2.0","id":decodedData['id'],"method":"eth_sendRawTransaction","params":[r.json()['result']['raw']]})
            print(data)
            r = requests.post('https://cloudflare-eth.com/', data=data, headers=newheaders)
            print(r.json())
        else:
            r = requests.post('http://127.0.0.1:8545' + self.path, data=data, headers=newheaders)
        
        self.send_response(r.status_code)
        print("FINALRESP", r.headers, r.content)

        self.send_header("Content-Type", "application/json")
        self.send_header('Content-Length', len(r.content))
        self.end_headers()
        self.wfile.write(r.content)


httpd = http.server.HTTPServer(('127.0.0.1', 8546), Proxy)
try:
    httpd.serve_forever()
except KeyboardInterrupt:
    pass

httpd.server_close()