organization #2

.gitignore

@@ -1,5 +1,6 @@
 # npm
 node_modules
+.env
 
 # Byte-compiled / optimized / DLL files
 __pycache__/

SigningServer/README.md

@@ -0,0 +1,4 @@
+# Signing Server
+
+Verifies deposits have been made to the escrow SC
+

SigningServer/app.py

@@ -0,0 +1,93 @@
+#####################################################
+# The Garlic Signing Server API
+# 
+# Functionality:
+#   - internal cheques 
+#   - issue external cheques
+#####################################################
+
+from flask import (
+    Flask,
+    Response,
+    jsonify,
+    make_response,
+    redirect,
+    request,
+)
+from werkzeug.exceptions import HTTPException
+import requests
+from Crypto.PublicKey import RSA
+
+
+app = Flask(__name__)
+SERVER_PRIVATE_KEY = "fijijf1939f3fd1yyt1yfyfy21f"
+ETHERSCAN_API_KEY = "A5B6KPZ99R1DHF94EEAJMIUSW3DWJDQCM5"
+
+# before request redirect to https
+@app.before_request
+def before_request():
+    if request.url.startswith("http://") and not "127.0." and not "192.168." in request.url:
+        return redirect(request.url.replace("http://", "https://", 301))
+
+
+
+@app.route('/sign', methods=['POST'])
+def sign():
+    """
+    Signs a message if tx has been done on the blockchain
+    json params: 
+        @txhash
+        @value
+        @recipient
+        @salt
+        @blockheight
+    returns:
+        @signature
+    """
+    if request.method == 'POST':
+        data = request.get_json()
+        txhash = data['txhash']
+        value = data['value']
+        recipient = data['recipient']
+        salt = data['salt']
+        blockheight = data['blockheight']
+
+        blockexplorer_url = f"https://api.etherscan.io/api?module=proxy&action=eth_getTransactionByHash&txhash={txhash}&apikey={ETHERSCAN_API_KEY}"
+        r = requests.get(blockexplorer_url)
+        if r.status_code == 200:
+            # tx exists on blockchain
+            # TODO: further verification
+
+            # sign json object
+            message = {
+                "txhash": txhash,
+                "value": value,
+                "recipient": recipient,
+                "salt": salt,
+                "blockheight": blockheight
+            }
+            signature = sign_message(message)
+            return jsonify({"signature": signature})
+        else:
+            print(r.status_code)
+            return jsonify({"error": "tx not found"})
+    else:
+        return jsonify({"error": "invalid request"})
+
+
+def sign_message(message):
+    """
+    Signs a message with the server's private key
+    """
+    key = RSA.importKey(SERVER_PRIVATE_KEY)
+    signature = key.sign(message, '')
+    return signature
+
+
+if __name__ == '__main__':
+    app.run(debug=True)
+
+    # test with curl
+    # curl -H "Content-Type: application/json" -X POST -d '{"txhash":"0xadb037f6d8d2f31c39d3ac14ab2590956b74ddb8fbf9f0d74176ac3c43d709c0","value":"1000000000000000000","recipient":"0x2a1cb5fd815b0ec7628c2f70276b552c12921fd2032d11ca1423a939e51682eb","salt":"271721t ","blockheight":"111"}' http://127.0.0.1:5000/sign
+
+

SigningServer/requirements.txt

@@ -0,0 +1,18 @@
+flask
+
+### External Python libraries to install in venv
+# TODO: add versions (maybe?)
+
+# dev stuff
+ipykernel
+black
+black[jupyter]
+
+# blockchain stuff
+# eth-brownie
+web3
+pysha3
+
+# server stuff
+flask
+gunicorn

SmartContracts/README.md

@@ -0,0 +1 @@
+Alho Smart Contracts

dApp/README.md

@@ -0,0 +1 @@
+Frontend for stuff