auth: disable password change when not using internal auth

kallithea/controllers/admin/my_account.py

@@ -155,7 +155,11 b' class MyAccountController(BaseController'
     def my_account_password(self):
         c.active = 'password'
         self.__load_data()
-        if request.POST:
+
+        managed_fields = auth_modules.get_managed_fields(c.user)
+        c.can_change_password = 'password' not in managed_fields
+
+        if request.POST and c.can_change_password:
             _form = PasswordChangeForm(self.authuser.username)()
             try:
                 form_result = _form.to_python(request.POST)

kallithea/templates/admin/my_account/my_account_password.html

@@ -1,4 +1,7 b''
 <div style="font-size: 20px; color: #666666; padding: 0px 0px 10px 0px">${_('Change Your Account Password')}</div>
+
+%if c.can_change_password:
+
 ${h.form(url('my_account_password'), method='post')}
 <div class="form">
     <div class="fields">
@@ -36,3 +39,9 b''
     </div>
 </div>
 ${h.end_form()}
+
+%else:
+
+${_('This account is managed with %s and the password cannot be changed here') % c.user.extern_type}
+
+%endif