Defines a proper inspector

pisa-btc/pisa/inspector.py

@@ -1,50 +1,220 @@
+import re
 from pisa.appointment import Appointment
+from pisa import errors
+from utils.authproxy import AuthServiceProxy, JSONRPCException
+from conf import BTC_RPC_USER, BTC_RPC_PASSWD, BTC_RPC_HOST, BTC_RPC_PORT, MIN_DISPUTE_DELTA, SUPPORTED_CIPHERS, \
+    SUPPORTED_HASH_FUNCTIONS
 
 
 class Inspector:
-    def __init__(self):
-        pass
+    def __init__(self, debug=False, logging=None):
+        self.debug = debug
+        self.logging = logging
 
-    def inspect(self, data, debug):
-        # TODO: We need to define standard names for the json fields, using Paddy's for now
-
-        appointment = None
+    def inspect(self, data):
+        message = None
+        rcode = 0
 
         locator = data.get('locator')
-        start_time = data.get('start_block')
-        end_time = data.get('end_block')
+        start_time = data.get('start_time')
+        end_time = data.get('end_time')
         dispute_delta = data.get('dispute_delta')
         encrypted_blob = data.get('encrypted_blob')
         cipher = data.get('cipher')
         hash_function = data.get('hash_function')
 
-        if self.check_locator(locator, debug) and self.check_start_time(start_time, debug) and \
-                self.check_end_time(end_time, debug) and self.check_delta(dispute_delta, debug) and \
-                self.check_blob(encrypted_blob, debug) and self.check_cipher(cipher, debug) and \
-                self.check_cipher(hash_function, debug):
-            appointment = Appointment(locator, start_time, end_time, dispute_delta, encrypted_blob, cipher,
-                                      hash_function)
+        bitcoin_cli = AuthServiceProxy("http://%s:%s@%s:%d" % (BTC_RPC_USER, BTC_RPC_PASSWD, BTC_RPC_HOST,
+                                                               BTC_RPC_PORT))
+        try:
+            block_height = bitcoin_cli.getblockcount()
 
-        return appointment
+            rcode, message = self.check_locator(locator)
+            if rcode == 0:
+                rcode, message = self.check_start_time(start_time, block_height)
+            if rcode == 0:
+                rcode, message = self.check_end_time(end_time, start_time, block_height)
+            if rcode == 0:
+                rcode, message = self.check_delta(dispute_delta, start_time, end_time)
+            if rcode == 0:
+                rcode, message = self.check_blob(encrypted_blob)
+            if rcode == 0:
+                rcode, message = self.check_cipher(cipher)
+            if rcode == 0:
+                rcode, message = self.check_hash_function(hash_function)
 
-    # FIXME: Define checks
-    def check_locator(self, locator, debug):
-        return locator is not None
+            if rcode == 0:
+                r = Appointment(locator, start_time, end_time, dispute_delta, encrypted_blob, cipher,
+                                          hash_function)
+            else:
+                r = (rcode, message)
 
-    def check_start_time(self, start_time, debug):
-        return start_time is not None
+        except JSONRPCException as e:
+            if self.debug:
+                self.logging.error("[Inspector] JSONRPCException. Error code {}".format(e))
 
-    def check_end_time(self, end_time, debug):
-        return end_time is not None
+        return rcode, message
 
-    def check_delta(self, dispute_delta, debug):
-        return dispute_delta is not None
+    def check_locator(self, locator):
+        message = None
+        rcode = 0
 
-    def check_blob(self, encrypted_blob, debug):
-        return encrypted_blob is not None
+        if locator is None:
+            rcode = errors.APPOINTMENT_EMPTY_FIELD
+            message = "empty locator received"
+        elif type(locator) != str:
+            rcode = errors.APPOINTMENT_WRONG_FIELD_TYPE
+            message = "wrong locator data type ({})".format(type(locator))
+        elif len(locator) != 32:
+            rcode = errors.APPOINTMENT_WRONG_FIELD_SIZE
+            message = "wrong locator size ({})".format(len(locator))
+        elif re.search(r'^[0-9A-Fa-f]+$', locator) is None:
+            rcode = errors.APPOINTMENT_WRONG_FIELD_FORMAT
+            message = "wrong locator format ({})".format(locator)
 
-    def check_cipher(self, cipher, debug):
-        return cipher is not None
+        if self.debug and message:
+            self.logging.error("[Inspector] {}".format(message))
 
-    def check_hash_function(self, hash_function, debug):
-        return hash_function is not None
+        return rcode, message
+
+    def check_start_time(self, start_time, block_height):
+        message = None
+        rcode = 0
+
+        t = type(start_time)
+
+        if start_time is None:
+            rcode = errors.APPOINTMENT_EMPTY_FIELD
+            message = "empty start_time received"
+        elif t != int:
+            rcode = errors.APPOINTMENT_WRONG_FIELD_TYPE
+            message = "wrong start_time data type ({})".format(t)
+        elif start_time <= block_height:
+            rcode = errors.APPOINTMENT_FIELD_TOO_SMALL
+            if start_time < block_height:
+                message = "start_time is in the past"
+            else:
+                message = "start_time too close to current height"
+
+        if self.debug and message:
+            self.logging.error("[Inspector] {}".format(message))
+
+        return rcode, message
+
+    def check_end_time(self, end_time, start_time, block_height):
+        message = None
+        rcode = 0
+
+        t = type(end_time)
+
+        if end_time is None:
+            rcode = errors.APPOINTMENT_EMPTY_FIELD
+            message = "empty end_time received"
+        elif t != int:
+            rcode = errors.APPOINTMENT_WRONG_FIELD_TYPE
+            message = "wrong end_time data type ({})".format(t)
+        elif start_time >= end_time:
+            rcode = errors.APPOINTMENT_FIELD_TOO_SMALL
+            if start_time > end_time:
+                message = "end_time is smaller than start_time"
+            else:
+                message = "end_time is equal to start_time"
+        elif block_height > end_time:
+            rcode = errors.APPOINTMENT_FIELD_TOO_SMALL
+            message = 'end_time is in the past'
+
+        if self.debug and message:
+            self.logging.error("[Inspector] {}".format(message))
+
+        return rcode, message
+
+    def check_delta(self, dispute_delta, start_time, end_time):
+        message = None
+        rcode = 0
+
+        t = type(dispute_delta)
+        delta = end_time - start_time
+
+        if dispute_delta is None:
+            rcode = errors.APPOINTMENT_EMPTY_FIELD
+            message = "empty dispute_delta received"
+        elif t != int:
+            rcode = errors.APPOINTMENT_WRONG_FIELD_TYPE
+            message = "wrong dispute_delta data type ({})".format(t)
+        elif end_time - start_time < dispute_delta:
+            rcode = errors.APPOINTMENT_FIELD_TOO_BIG
+            message = "wrong dispute_delta provided ({} > {})".format(dispute_delta, delta)
+        elif end_time - start_time > dispute_delta:
+            rcode = errors.APPOINTMENT_FIELD_TOO_SMALL
+            message = "wrong dispute_delta provided ({} < {})".format(dispute_delta, delta)
+        elif dispute_delta < MIN_DISPUTE_DELTA:
+            rcode = errors.APPOINTMENT_FIELD_TOO_SMALL
+            message = "dispute delta too small ({} < {})".format(dispute_delta, MIN_DISPUTE_DELTA)
+
+        if self.debug and message:
+            self.logging.error("[Inspector] {}".format(message))
+
+        return rcode, message
+
+    # DISCUSS: ANYTHING TO CHECK HERE?
+    def check_blob(self, encrypted_blob):
+        message = None
+        rcode = 0
+
+        t = type(encrypted_blob)
+
+        if encrypted_blob is None:
+            rcode = errors.APPOINTMENT_EMPTY_FIELD
+            message = "empty encrypted_blob received"
+        elif t != str:
+            rcode = errors.APPOINTMENT_WRONG_FIELD_TYPE
+            message = "wrong encrypted_blob data type ({})".format(t)
+        elif encrypted_blob == '':
+            # ToDo: We may want to define this to be at least as long as one block of the cypher we are using
+            rcode = errors.APPOINTMENT_WRONG_FIELD
+            message = "wrong encrypted_blob".format(t)
+        if self.debug and message:
+            self.logging.error("[Inspector] {}".format(message))
+
+        return rcode, message
+
+    def check_cipher(self, cipher):
+        message = None
+        rcode = 0
+
+        t = type(cipher)
+
+        if cipher is None:
+            rcode = errors.APPOINTMENT_EMPTY_FIELD
+            message = "empty cipher received"
+        elif t != str:
+            rcode = errors.APPOINTMENT_WRONG_FIELD_TYPE
+            message = "wrong cipher data type ({})".format(t)
+        elif cipher not in SUPPORTED_CIPHERS:
+            rcode = errors.APPOINTMENT_CIPHER_NOT_SUPPORTED
+            message = "cipher not supported: {}".format(cipher)
+
+        if self.debug and message:
+            self.logging.error("[Inspector] {}".format(message))
+
+        return rcode, message
+
+    def check_hash_function(self, hash_function):
+        message = None
+        rcode = 0
+
+        t = type(hash_function)
+
+        if hash_function is None:
+            rcode = errors.APPOINTMENT_EMPTY_FIELD
+            message = "empty hash_function received"
+        elif t != str:
+            rcode = errors.APPOINTMENT_WRONG_FIELD_TYPE
+            message = "wrong hash_function data type ({})".format(t)
+        elif hash_function not in SUPPORTED_HASH_FUNCTIONS:
+            rcode = errors.APPOINTMENT_HASH_FUNCTION_NOT_SUPPORTED
+            message = "hash_function not supported {}".format(hash_function)
+
+        if self.debug and message:
+            self.logging.error("[Inspector] {}".format(message))
+
+        return rcode, message