Allow service contact details to be phone number, email or url

Service contact details are needed if the upload document permission is
enabled - this used to be a link but services can now choose to use a
link, email address or phone number. The form to add or change service
contact details now gives these options and validates the data according
to the type of contact details provided.

When validating phone numbers we can't use the existing validation
because we want to allow landlines too, so there is a basic check that
the phone number is the right length and doesn't include certain
characters.

app/main/forms.py

@@ -10,6 +10,7 @@ from notifications_utils.columns import Columns
 from notifications_utils.formatters import strip_whitespace
 from notifications_utils.recipients import (
     InvalidPhoneError,
+    normalise_phone_number,
     validate_phone_number,
 )
 from wtforms import (
@@ -592,13 +593,41 @@ class ProviderForm(StripWhitespaceForm):
     priority = IntegerField('Priority', [validators.NumberRange(min=1, max=100, message="Must be between 1 and 100")])
 
 
-class ServiceContactLinkForm(StripWhitespaceForm):
-    url = StringField(
-        "URL",
-        validators=[DataRequired(message='Can’t be empty'),
-                    URL(message='Must be a valid URL')]
+class ServiceContactDetailsForm(StripWhitespaceForm):
+    contact_details_type = RadioField(
+        'Type of contact details',
+        choices=[
+            ('url', 'Link'),
+            ('email_address', 'Email address'),
+            ('phone_number', 'Phone number'),
+        ],
+        validators=[DataRequired()]
     )
 
+    url = StringField("URL")
+    email_address = EmailField("Email address")
+    phone_number = StringField("Phone number")
+
+    def validate(self):
+
+        if self.contact_details_type.data == 'url':
+            self.url.validators = [DataRequired(), URL(message='Must be a valid URL')]
+
+        elif self.contact_details_type.data == 'email_address':
+            self.email_address.validators = [DataRequired(), Length(min=5, max=255), ValidEmail()]
+
+        elif self.contact_details_type.data == 'phone_number':
+            # we can't use the existing phone number validation functions here since we want to allow landlines
+            def valid_phone_number(self, num):
+                try:
+                    normalise_phone_number(num.data)
+                    return True
+                except InvalidPhoneError:
+                    raise ValidationError('Must be a valid phone number')
+            self.phone_number.validators = [DataRequired(), Length(min=5, max=20), valid_phone_number]
+
+        return super().validate()
+
 
 class ServiceReplyToEmailForm(StripWhitespaceForm):
     email_address = email_address(label='Email reply to address', gov_user=False)