adding initial bip70 script (wozz)

lib/paymentrequest.proto

@@ -0,0 +1,46 @@
+//
+// Simple Bitcoin Payment Protocol messages
+//
+// Use fields 1000+ for extensions;
+// to avoid conflicts, register extensions via pull-req at
+// https://github.com/bitcoin/bips/bip-0070/extensions.mediawiki
+//
+
+package payments;
+option java_package = "org.bitcoin.protocols.payments";
+option java_outer_classname = "Protos";
+
+// Generalized form of "send payment to this/these bitcoin addresses"
+message Output {
+        optional uint64 amount = 1 [default = 0]; // amount is integer-number-of-satoshis
+        required bytes script = 2; // usually one of the standard Script forms
+}
+message PaymentDetails {
+        optional string network = 1 [default = "main"]; // "main" or "test"
+        repeated Output outputs = 2;        // Where payment should be sent
+        required uint64 time = 3;           // Timestamp; when payment request created
+        optional uint64 expires = 4;        // Timestamp; when this request should be considered invalid
+        optional string memo = 5;           // Human-readable description of request for the customer
+        optional string payment_url = 6;    // URL to send Payment and get PaymentACK
+        optional bytes merchant_data = 7;   // Arbitrary data to include in the Payment message
+}
+message PaymentRequest {
+        optional uint32 payment_details_version = 1 [default = 1];
+        optional string pki_type = 2 [default = "none"];  // none / x509+sha256 / x509+sha1
+        optional bytes pki_data = 3;                      // depends on pki_type
+        required bytes serialized_payment_details = 4;    // PaymentDetails
+        optional bytes signature = 5;                     // pki-dependent signature
+}
+message X509Certificates {
+        repeated bytes certificate = 1;    // DER-encoded X.509 certificate chain
+}
+message Payment {
+        optional bytes merchant_data = 1;  // From PaymentDetails.merchant_data
+        repeated bytes transactions = 2;   // Signed transactions that satisfy PaymentDetails.outputs
+        repeated Output refund_to = 3;     // Where to send refunds, if a refund is necessary
+        optional string memo = 4;          // Human-readable message for the merchant
+}
+message PaymentACK {
+        required Payment payment = 1;      // Payment message that triggered this ACK
+        optional string memo = 2;          // human-readable message for customer
+}

lib/paymentrequest.py

@@ -0,0 +1,208 @@
+import hashlib
+import httplib
+import os.path
+import re
+import sys
+import threading
+import time
+import traceback
+import urllib2
+
+try:
+    import paymentrequest_pb2
+except:
+    print "protoc --proto_path=lib/ --python_out=lib/ lib/paymentrequest.proto"
+    sys.exit(1)
+
+import urlparse
+import requests
+from M2Crypto import X509
+
+from bitcoin import is_valid
+import urlparse
+
+import transaction
+
+REQUEST_HEADERS = {'Accept': 'application/bitcoin-paymentrequest', 'User-Agent': 'Electrum'}
+ACK_HEADERS = {'Content-Type':'application/bitcoin-payment','Accept':'application/bitcoin-paymentack','User-Agent':'Electrum'}
+
+class PaymentRequest:
+
+    def __init__(self):
+        self.ca_path = os.path.expanduser("~/.electrum/ca/ca-bundle.crt")
+        self.ca_list = {}
+        try:
+            with open(self.ca_path, 'r') as ca_f:
+                c = ""
+                for line in ca_f:
+                    if line == "-----BEGIN CERTIFICATE-----\n":
+                        c = line
+                    else:
+                        c += line
+                    if line == "-----END CERTIFICATE-----\n":
+                        x = X509.load_cert_string(c)
+                        self.ca_list[x.get_fingerprint()] = x
+        except Exception:
+            print "ERROR: Could not open %s"%self.ca_path
+            print "ca-bundle.crt file should be placed in ~/.electrum/ca/ca-bundle.crt"
+            print "Documentation on how to download or create the file here: http://curl.haxx.se/docs/caextract.html"
+            print "Payment will continue with manual verification."
+
+
+
+    def verify(self, url):
+
+        u = urlparse.urlparse(urllib2.unquote(url))
+        self.domain = u.netloc
+
+        connection = httplib.HTTPConnection(u.netloc) if u.scheme == 'http' else httplib.HTTPSConnection(u.netloc)
+        connection.request("GET",u.geturl(), headers=REQUEST_HEADERS)
+        resp = connection.getresponse()
+
+        r = resp.read()
+        paymntreq = paymentrequest_pb2.PaymentRequest()
+        paymntreq.ParseFromString(r)
+
+        sig = paymntreq.signature
+
+        cert = paymentrequest_pb2.X509Certificates()
+        cert.ParseFromString(paymntreq.pki_data)
+        cert_num = len(cert.certificate)
+
+        x509_1 = X509.load_cert_der_string(cert.certificate[0])
+        if self.domain != x509_1.get_subject().CN:
+            ###TODO: check for subject alt names
+            ###       check for wildcards
+            print "ERROR: Certificate Subject Domain Mismatch"
+            print self.domain, x509_1.get_subject().CN
+            #return
+
+        x509 = []
+        CA_OU = ''
+
+        if cert_num > 1:
+            for i in range(cert_num - 1):
+                x509.append(X509.load_cert_der_string(cert.certificate[i+1]))
+                if x509[i].check_ca() == 0:
+                    print "ERROR: Supplied CA Certificate Error"
+                    return
+            for i in range(cert_num - 1):
+                if i == 0:
+                    if x509_1.verify(x509[i].get_pubkey()) != 1:
+                        print "ERROR: Certificate not Signed by Provided CA Certificate Chain"
+                        return
+                else:
+                    if x509[i-1].verify(x509[i].get_pubkey()) != 1:
+                        print "ERROR: CA Certificate not Signed by Provided CA Certificate Chain"
+                        return
+
+            supplied_CA_fingerprint = x509[cert_num-2].get_fingerprint()
+            supplied_CA_CN = x509[cert_num-2].get_subject().CN
+            CA_match = False
+
+            x = self.ca_list.get(supplied_CA_fingerprint)
+            if x:
+                CA_OU = x.get_subject().OU
+                CA_match = True
+                if x.get_subject().CN != supplied_CA_CN:
+                    print "ERROR: Trusted CA CN Mismatch; however CA has trusted fingerprint"
+                    print "Payment will continue with manual verification."
+            else:
+                print "ERROR: Supplied CA Not Found in Trusted CA Store."
+                print "Payment will continue with manual verification."
+        else:
+            print "ERROR: CA Certificate Chain Not Provided by Payment Processor"
+            return False
+
+        paymntreq.signature = ''
+        s = paymntreq.SerializeToString()
+        pubkey_1 = x509_1.get_pubkey()
+
+        if paymntreq.pki_type == "x509+sha256":
+            pubkey_1.reset_context(md="sha256")
+        elif paymntreq.pki_type == "x509+sha1":
+            pubkey_1.reset_context(md="sha1")
+        else:
+            print "ERROR: Unsupported PKI Type for Message Signature"
+            return False
+
+        pubkey_1.verify_init()
+        pubkey_1.verify_update(s)
+        if pubkey_1.verify_final(sig) != 1:
+            print "ERROR: Invalid Signature for Payment Request Data"
+            return False
+
+        ### SIG Verified
+
+        self.payment_details = pay_det = paymentrequest_pb2.PaymentDetails()
+        pay_det.ParseFromString(paymntreq.serialized_payment_details)
+
+        if pay_det.expires and pay_det.expires < int(time.time()):
+            print "ERROR: Payment Request has Expired."
+            return False
+
+        self.outputs = []
+        for o in pay_det.outputs:
+            addr = transaction.get_address_from_output_script(o.script)[1]
+            self.outputs.append( (addr, o.amount) )
+
+        if CA_match:
+            print 'Signed By Trusted CA: ', CA_OU
+
+        return True
+
+
+
+    def send_ack(self, raw_tx, refund_addr):
+
+        pay_det = self.payment_details
+        if pay_det.payment_url:
+            paymnt = paymentrequest_pb2.Payment()
+
+            paymnt.merchant_data = pay_det.merchant_data
+            paymnt.transactions.append(raw_tx)
+
+            ref_out = paymnt.refund_to.add()
+            ref_out.script = transaction.Transaction.pay_script(refund_addr)
+            paymnt.memo = "Paid using Electrum"
+            pm = paymnt.SerializeToString()
+
+            payurl = urlparse.urlparse(pay_det.payment_url)
+            try:
+                r = requests.post(payurl.geturl(), data=pm, headers=ACK_HEADERS, verify=self.ca_path)
+            except requests.exceptions.SSLError:
+                print "Payment Message/PaymentACK verify Failed"
+                try:
+                    r = requests.post(payurl.geturl(), data=pm, headers=ACK_HEADERS, verify=False)
+                except Exception as e:
+                    print "Payment Message/PaymentACK Failed"
+                    print e
+                    return
+            try:
+                paymntack = paymentrequest_pb2.PaymentACK()
+                paymntack.ParseFromString(r.content)
+                print "PaymentACK message received: %s" % paymntack.memo
+            except Exception:
+                print "PaymentACK could not be processed. Payment was sent; please manually verify that payment was received."
+
+
+uri = "bitcoin:mpu3yTLdqA1BgGtFUwkVJmhnU3q5afaFkf?r=https%3A%2F%2Fbitcoincore.org%2F%7Egavin%2Ff.php%3Fh%3D26c19879d44c3891214e7897797b9160&amount=1"
+url = "https%3A%2F%2Fbitcoincore.org%2F%7Egavin%2Ff.php%3Fh%3D26c19879d44c3891214e7897797b9160"
+
+#uri = "bitcoin:1m9Lw2pFCe6Hs7xUuo9fMJCzEwQNdCo5e?amount=0.0012&r=https%3A%2F%2Fbitpay.com%2Fi%2F8XNDiQU92H2whNG4j8hZ5M"
+#url = "https%3A%2F%2Fbitpay.com%2Fi%2F8XNDiQU92H2whNG4j8hZ5M"
+
+
+if __name__ == "__main__":
+
+    pr = PaymentRequest()
+    if not pr.verify(url):
+        sys.exit(1)
+
+    print 'Payment Request Verified Domain: ', pr.domain
+    print 'outputs', pr.outputs
+    print 'Payment Memo: ', pr.payment_details.memo
+
+    tx = "blah"
+    pr.send_ack(tx, "1vXAXUnGitimzinpXrqDWVU4tyAAQ34RA")
+