download source code from etherscan using official api

Author: cassc

etherscan.py

@@ -0,0 +1,42 @@
+# Download contract source code using Etherscan HTTP json api
+
+import requests
+import json
+import argparse
+
+ap = argparse.ArgumentParser()
+ap.add_argument("--address", type=str, required=True, help="Contract address")
+ap.add_argument("--apikey", type=str, required=True, help="Etherscan api key")
+ap.add_argument("--output", type=str, default="source.json", help="Output source code as json, suitable for use as solc input ")
+
+args = ap.parse_args()
+
+address = args.address
+api_key = args.apikey
+output = args.output
+
+if not api_key:
+    print("Please provide --apikey")
+    exit(1)
+
+if not address:
+    print("Please provide --address")
+    exit(1)
+
+url = f'https://api.etherscan.io/api?module=contract&action=getsourcecode&address={address}&apikey={api_key}'
+
+response = requests.get(url)
+# with open('response.txt', 'w') as f:
+#     f.write(response.text)
+
+data = json.loads(response.text)
+
+if data['status'] == '1':
+    contract_name = data['result'][0]['ContractName']
+    source_code = data['result'][0]['SourceCode']
+
+    with open(output, 'w') as f:
+        t = source_code.replace('{{', '{').replace('}}', '}')
+        f.write(t)
+else:
+    print('Error: Unable to retrieve contract source code')