When the demo application is enabled, we disable the ''password change'' action for default super administrator.

see #187

demo/__init__.py

@@ -35,6 +35,10 @@ def announcement(**kwargs):
         return [txt]
     return ""
 
+def password_change(user):
+    return [user.id == 1]
+
 if 'modoboa.demo' in settings.INSTALLED_APPS:
     events.register("UserMenuDisplay", menu)
     events.register("GetAnnouncement", announcement)
+    events.register("PasswordChange", password_change)

doc/plugin_api.rst

@@ -256,6 +256,17 @@ callbacks and indicates the place where the announcement will appear:
 
 Callbacks listening to this event must return a list of string.
 
+PasswordChange
+--------------
+
+Raised just before a *password change* action. The associated ``User``
+object is provided inside the ``user`` keyword argument.
+
+Callbacks listening to this event must return a list containing either
+``True`` or ``False``. If at least one ``True`` is returned, the
+*password change* will be cancelled (ie. changing the password for
+this user is disabled).
+
 Parameters
 ==========
 

lib/events.py

@@ -12,6 +12,8 @@ events = ["CreateDomain",
           "DeleteMailbox",
           "ModifyMailbox",
 
+          "PasswordChange",
+
           "UserMenuDisplay",
           "AdminMenuDisplay",
 

templates/common/error_simple.html

@@ -0,0 +1,4 @@
+{% extends "layout_simple.html" %}
+{% block content %}
+<div class="error"><p>{{ error }}</p></div>
+{% endblock %}

userprefs/views.py

@@ -3,9 +3,10 @@ from django.core.urlresolvers import reverse
 from django.http import HttpResponseRedirect
 from django.contrib.auth.decorators \
     import login_required, user_passes_test
+from django.conf import settings
 from django.utils.translation import ugettext as _
-from modoboa.lib import parameters
-from modoboa.lib.webutils import _render, ajax_response
+from modoboa.lib import parameters, events
+from modoboa.lib.webutils import _render, _render_error, ajax_response
 from forms import *
 from modoboa.admin.models import Mailbox, Alias
 from modoboa.admin.lib import is_domain_admin
@@ -21,6 +22,11 @@ def changepassword(request, tplname="userprefs/chpassword.html"):
         target = request.user
     else:
         target = Mailbox.objects.get(user=request.user.id)
+    res = events.raiseQueryEvent("PasswordChange", user=request.user)
+    if True in res:
+        ctx = dict(error=_("Password change is disabled for this user"))
+        return _render_error(request, errortpl="error_simple", user_context=ctx)
+
     error = None
     if request.method == "POST":
         form = ChangePasswordForm(target, request.POST)
@@ -32,7 +38,8 @@ def changepassword(request, tplname="userprefs/chpassword.html"):
                 request.session["password"] = encrypt(request.POST["confirmation"])
             target.save()
             return ajax_response(request, respmsg=_("Password changed"))
-        return ajax_response(request, status="ko", template=tplname, form=form, error=error)
+        return ajax_response(request, status="ko", template=tplname, 
+                             form=form, error=error)
 
     form = ChangePasswordForm(target)
     return _render(request, 'userprefs/chpassword.html', {