personalization: refactor SmspTpScAddr

Refactor SmspTpScAddr to the new ConfigurableParameter implementation
style.

Change-Id: I2600369e195e9f5aed7f4e6ff99ae273ed3ab3bf

pySim/esim/saip/personalization.py

@@ -338,10 +338,17 @@ class Imsi(DecimalParam):
 class SmspTpScAddr(ConfigurableParameter):
     """Configurable SMSC (SMS Service Centre) TP-SC-ADDR. Expects to be a phone number in national or
     international format (designated by a leading +). Automatically sets the NPI to E.164 and the TON based on
-    presence or absence of leading +"""
+    presence or absence of leading +."""
+    allow_chars = '+0123456789'
+    strip_chars = ' \t\r\n'
+    max_len = 21 # '+' and 20 digits
+    min_len = 1
 
-    def validate(self):
-        addr_str = str(self.input_value)
+
+    @classmethod
+    def validate_val(cls, val):
+        val = super().validate_val(val)
+        addr_str = str(val)
         if addr_str[0] == '+':
             digits = addr_str[1:]
             international = True
@@ -349,13 +356,17 @@ class SmspTpScAddr(ConfigurableParameter):
             digits = addr_str
             international = False
         if len(digits) > 20:
-            raise ValueError('TP-SC-ADDR must not exceed 20 digits')
+            raise ValueError(f'TP-SC-ADDR must not exceed 20 digits: {digits!r}')
         if not digits.isdecimal():
-            raise ValueError('TP-SC-ADDR must only contain decimal digits')
-        self.value = (international, digits)
+            raise ValueError(f'TP-SC-ADDR must only contain decimal digits: {digits!r}')
+        return (international, digits)
 
-    def apply(self, pes: ProfileElementSequence):
-        international, digits = self.value
+    @classmethod
+    def apply_val(cls, pes: ProfileElementSequence, val):
+        """val must be a tuple (international[bool], digits[str]).
+        For example, an input of "+1234" corresponds to (True, "1234");
+        An input of "1234" corresponds to (False, "1234")."""
+        international, digits = val
         for pe in pes.get_pes_for_type('usim'):
             # obtain the File instance from the ProfileElementUSIM
             f_smsp = pe.files['ef-smsp']