← Back to branch summary

~azzar1/unity/add-show-desktop-key

« back to all changes in this revision

Viewing changes to ivle/webapp/security/views.py

  • Committer: William Grant
  • Date: 2012-06-28 01:52:02 UTC
  • Revision ID: me@williamgrant.id.au-20120628015202-f6ru7o367gt6nvgz
Hah

Show diffs side-by-side

added added

removed removed

Lines of Context:
ivle/webapp/security/views.py
17
17
 
18
18
# Author: Will Grant, Nick Chadwick
19
19
 
 
20
import urllib
 
21
import datetime
 
22
try:
 
23
    import mod_python.Cookie
 
24
except ImportError:
 
25
    # This needs to be importable from outside Apache.
 
26
    pass
 
27
 
 
28
import ivle.pulldown_subj
 
29
import ivle.webapp.security
 
30
from ivle.auth import authenticate, AuthError
20
31
from ivle.webapp.base.xhtml import XHTMLView
21
 
import ivle.util
 
32
from ivle.webapp.base.plugins import CookiePlugin
 
33
 
 
34
class LoginView(XHTMLView):
 
35
    '''A view to allow a user to log in.'''
 
36
    template = 'login.html'
 
37
    allow_overlays = False
 
38
 
 
39
    def authorize(self, req):
 
40
        return True
 
41
 
 
42
    def populate(self, req, ctx):
 
43
        fields = req.get_fieldstorage()
 
44
        nexturl = fields.getfirst('url')
 
45
 
 
46
        # XXX Warning that Internet Explorer is unsupported
 
47
        # Test if the user is in Internet Explorer
 
48
        try:
 
49
            useragent = req.headers_in['User-Agent']
 
50
            # A bit of very basic UA string detection
 
51
            ctx['msie'] = ('MSIE' in useragent
 
52
                           and 'AppleWebKit' not in useragent
 
53
                           and 'Gecko' not in useragent
 
54
                           and 'Opera' not in useragent)
 
55
        except KeyError:
 
56
            ctx['msie'] = False
 
57
 
 
58
        if nexturl is None:
 
59
            nexturl = '/'
 
60
 
 
61
        # We are already logged in. If it is a POST, they might be trying to
 
62
        # clobber their session with some new credentials. That's their own
 
63
        # business, so we let them do it. Otherwise, we don't bother prompting
 
64
        # and just redirect to the destination.
 
65
        # Note that req.user is None even if we are 'logged in', if the user is
 
66
        # invalid (state != enabled, or expired).
 
67
        if req.method != "POST" and req.user is not None:
 
68
            req.throw_redirect(nexturl)
 
69
 
 
70
        # Don't give any URL if we want /.
 
71
        if nexturl == '/':
 
72
            query_string = ''
 
73
        else:
 
74
            query_string = '?url=' + urllib.quote(nexturl, safe="/~")
 
75
 
 
76
        ctx['path'] = req.make_path('+login') + query_string
 
77
 
 
78
        # If this succeeds, the user is invalid.
 
79
        user = ivle.webapp.security.get_user_details(req)
 
80
        if user is not None:
 
81
            if user.state == "no_agreement":
 
82
                # Authenticated, but need to accept the ToS. Send them there.
 
83
                # IMPORTANT NOTE FOR HACKERS: You can't simply disable this
 
84
                # if you are not planning to display a ToS page - the ToS
 
85
                # acceptance process actually calls usrmgt to create the user
 
86
                # jails and related stuff.
 
87
                req.throw_redirect(req.make_path('+tos') + query_string)
 
88
            elif user.state == "pending":
 
89
                # FIXME: this isn't quite the right answer, but it
 
90
                # should be more robust in the short term.
 
91
                session = req.get_session()
 
92
                session.invalidate()
 
93
                session.delete()
 
94
                user.state = u'no_agreement'
 
95
                req.store.commit()
 
96
                req.throw_redirect(nexturl)
 
97
 
 
98
        if req.method == "POST":
 
99
            # While req.user is normally set to get_user_details, it won't set
 
100
            # it if the account isn't valid. So we get it ourselves.
 
101
            user = ivle.webapp.security.get_user_details(req)
 
102
 
 
103
            badlogin = None
 
104
 
 
105
            username = fields.getfirst('user')
 
106
            password = fields.getfirst('pass')
 
107
            if username is not None:
 
108
                # From this point onwards, we will be showing an error message
 
109
                # if unsuccessful.
 
110
                # Authenticate
 
111
                if password is None:
 
112
                    badlogin = "No password supplied."
 
113
                else:
 
114
                    user = None
 
115
                    try:
 
116
                        # Username is case insensitive
 
117
                        user = authenticate.authenticate(req.config, req.store,
 
118
                                    username.value.lower(), password.value)
 
119
                    except AuthError, msg:
 
120
                        badlogin = msg
 
121
                    if user is None:
 
122
                        # Must have got an error. Do not authenticate.
 
123
                        # The except: above will have set a message.
 
124
                        pass
 
125
                    else:
 
126
                        # Success - Set the session and redirect to the URL.
 
127
                        session = req.get_session()
 
128
                        session['login'] = user.login
 
129
                        session.save()
 
130
                        session.unlock()
 
131
                        user.last_login = datetime.datetime.now()
 
132
 
 
133
                        # Create cookies for plugins that might request them.
 
134
                        for plugin in req.config.plugin_index[CookiePlugin]:
 
135
                            for cookie in plugin.cookies:
 
136
                                # The function can be None if they just need to be
 
137
                                # deleted at logout.
 
138
                                if plugin.cookies[cookie] is not None:
 
139
                                    req.add_cookie(mod_python.Cookie.Cookie(cookie,
 
140
                                          plugin.cookies[cookie](user), path='/'))
 
141
 
 
142
                        # Add any new enrolments.
 
143
                        ivle.pulldown_subj.enrol_user(req.config, req.store, user)
 
144
                        req.store.commit()
 
145
 
 
146
                        req.throw_redirect(nexturl)
 
147
 
 
148
                # We didn't succeed.
 
149
                # Render the login form with the error message.
 
150
                ctx['error'] = badlogin
 
151
 
22
152
 
23
153
class LogoutView(XHTMLView):
24
154
    '''A view to log the current session out.'''
25
155
    template = 'logout.html'
 
156
    allow_overlays = False
 
157
 
 
158
    def authorize(self, req):
 
159
        # This can be used by any authenticated user, even if they haven't
 
160
        # accepted the ToS yet.
 
161
        return ivle.webapp.security.get_user_details(req) is not None
26
162
 
27
163
    def populate(self, req, ctx):
28
164
        if req.method == "POST":
29
165
            req.logout()
30
166
        else:
31
 
            ctx['path'] =  ivle.util.make_path('logout')
 
167
            ctx['path'] =  req.make_path('+logout')