send error messages for payment requests

gui/qt/__init__.py

@@ -172,22 +172,22 @@ class ElectrumGui:
                 from electrum import paymentrequest
             except:
                 print "cannot import paymentrequest"
-                return
-            def payment_request():
-                pr = paymentrequest.PaymentRequest(request_url)
-                if pr.verify() or 1:
-                    self.main_window.payment_request = pr
-                    self.main_window.emit(SIGNAL('payment_request_ok'))
-                else:
-                    self.main_window.emit(SIGNAL('payment_request_failed'))
-
-            threading.Thread(target=payment_request).start()
-            self.main_window.tabs.setCurrentIndex(1)
-        else:
-            self.main_window.set_send(address, amount, label, message)
+                request_url = None
 
-        if self.lite_window:
+        if not request_url:
+            self.main_window.set_send(address, amount, label, message)
             self.lite_window.set_payment_fields(address, amount)
+            return
+
+        def payment_request():
+            self.payment_request = paymentrequest.PaymentRequest(request_url)
+            if self.payment_request.verify():
+                self.main_window.emit(SIGNAL('payment_request_ok'))
+            else:
+                self.main_window.emit(SIGNAL('payment_request_error'))
+
+        threading.Thread(target=payment_request).start()
+        self.main_window.prepare_for_payment_request()
 
 
     def main(self, url):

gui/qt/main_window.py

@@ -107,6 +107,7 @@ class ElectrumWindow(QMainWindow):
 
         self.config = config
         self.network = network
+        self.gui_object = gui_object
         self.tray = gui_object.tray
         self.go_lite = gui_object.go_lite
         self.lite = None
@@ -157,6 +158,7 @@ class ElectrumWindow(QMainWindow):
         self.connect(self, QtCore.SIGNAL('send_tx2'), self.send_tx2)
         self.connect(self, QtCore.SIGNAL('send_tx3'), self.send_tx3)
         self.connect(self, QtCore.SIGNAL('payment_request_ok'), self.payment_request_ok)
+        self.connect(self, QtCore.SIGNAL('payment_request_error'), self.payment_request_error)
 
         self.history_list.setFocus(True)
 
@@ -896,14 +898,22 @@ class ElectrumWindow(QMainWindow):
 
 
 
-    def payment_request_ok(self):
+    def prepare_for_payment_request(self):
         style = "QWidget { background-color:none;border:none;}"
-        self.payto_e.setText(self.payment_request.domain)
+        self.tabs.setCurrentIndex(1)
         self.payto_e.setReadOnly(True)
         self.payto_e.setStyleSheet(style)
-        self.amount_e.setText(self.format_amount(self.payment_request.get_amount()))
         self.amount_e.setReadOnly(True)
+        self.payto_e.setText(_("please wait..."))
         self.amount_e.setStyleSheet(style)
+        return True
+
+    def payment_request_ok(self):
+        self.payto_e.setText(self.gui_object.payment_request.domain)
+        self.amount_e.setText(self.format_amount(self.gui_object.payment_request.get_amount()))
+
+    def payment_request_error(self):
+        self.payto_e.setText(self.gui_object.payment_request.error)
 
 
     def set_send(self, address, amount, label, message):

lib/paymentrequest.py

@@ -55,6 +55,7 @@ class PaymentRequest:
     def __init__(self, url):
         self.url = url
         self.outputs = []
+        self.error = ""
 
     def get_amount(self):
         return sum(map(lambda x:x[1], self.outputs))
@@ -74,7 +75,7 @@ class PaymentRequest:
 
         sig = paymntreq.signature
         if not sig:
-            print "No signature"
+            self.error = "No signature"
             return 
 
         cert = paymentrequest_pb2.X509Certificates()
@@ -101,8 +102,7 @@ class PaymentRequest:
                 print "ERROR: No SAN data"
             if not validcert:
                 ###TODO: check for wildcards
-                print "ERROR: Certificate Subject Domain Mismatch and SAN Mismatch"
-                print self.domain, x509_1.get_subject().CN
+                self.error = "ERROR: Certificate Subject Domain Mismatch and SAN Mismatch"
                 return
 
         x509 = []
@@ -112,16 +112,16 @@ class PaymentRequest:
             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"
+                    self.error = "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"
+                        self.error = "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"
+                        self.error = "ERROR: CA Certificate not Signed by Provided CA Certificate Chain"
                         return
 
             supplied_CA_fingerprint = x509[cert_num-2].get_fingerprint()
@@ -139,7 +139,7 @@ class PaymentRequest:
                 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"
+            self.error = "ERROR: CA Certificate Chain Not Provided by Payment Processor"
             return False
 
         paymntreq.signature = ''
@@ -151,13 +151,13 @@ class PaymentRequest:
         elif paymntreq.pki_type == "x509+sha1":
             pubkey_1.reset_context(md="sha1")
         else:
-            print "ERROR: Unsupported PKI Type for Message Signature"
+            self.error = "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"
+            self.error = "ERROR: Invalid Signature for Payment Request Data"
             return False
 
         ### SIG Verified
@@ -166,8 +166,8 @@ class PaymentRequest:
         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.error = "ERROR: Payment Request has Expired."
+            return False
 
         for o in pay_det.outputs:
             addr = transaction.get_address_from_output_script(o.script)[1]
@@ -176,7 +176,7 @@ class PaymentRequest:
         if CA_match:
             print 'Signed By Trusted CA: ', CA_OU
 
-        return pay_det
+        return True