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[НЕСОРТИРОВАННОЕ]
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36. ZODB + TRAVERSAL WIKI TUTORIAL

configured a forbidden view, the login view callable will be invoked whenever one of our users tries to execute a view callable that they are not allowed to invoke as determined by the authorization policy in use. In our application, for example, this means that if a user has not logged in, and he tries to add or edit a Wiki page, he will be shown the login form. Before being allowed to continue on to the add or edit form, he will have to provide credentials that give him permission to add or edit via this login form.

Note that we’re relying on some additional imports within the bodies of these views (e.g. remember and forget). We’ll see a rendering of the entire views.py file a little later here to show you where those come from.

36.7.5 Change Existing Views

In order to indicate whether the current user is logged in, we need to change each of our view_page, edit_page and add_page views in views.py to pass a “logged in” parameter into its template. We’ll add something like this to each view body:

1

2

from pyramid.security import authenticated_userid logged_in = authenticated_userid(request)

We’ll then change the return value of each view that has an associated renderer to pass the resulting logged_in value to the template. For example:

1

2

3

4

return dict(page = context, content = content, logged_in = logged_in, edit_url = edit_url)

36.7.6 Add permission Declarations to our view_config Decorators

To protect each of our views with a particular permission, we need to pass a permission argument to each of our pyramid.view.view_config decorators. To do so, within views.py:

•We add permission=’view’ to the decorator attached to the view_wiki and view_page view functions. This makes the assertion that only users who possess the view permission against the context resource at the time of the request may invoke these views. We’ve granted pyramid.security.Everyone the view permission at the root model via its ACL, so everyone will be able to invoke the view_wiki and view_page views.

422

36.7. ADDING AUTHORIZATION

•We add permission=’edit’ to the decorator attached to the add_page and edit_page view functions. This makes the assertion that only users who possess the effective edit permission against the context resource at the time of the request may invoke these views. We’ve granted the group:editors principal the edit permission at the root model via its ACL, so only a user whom is a member of the group named group:editors will able to invoke the add_page or edit_page views. We’ve likewise given the editor user membership to this group via the security.py file by mapping him to the group:editors group in the GROUPS data structure (GROUPS = {’editor’:[’group:editors’]}); the groupfinder function consults the GROUPS data structure. This means that the editor user can add and edit pages.

36.7.7 Add the login.pt Template

Add a login.pt template to your templates directory. It’s referred to within the login view we just added to views.py.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" xmlns:tal="http://xml.zope.org/namespaces/tal">

<head>

<title>Login - Pyramid tutorial wiki (based on TurboGears 20-Minute Wiki)</title>

<meta http-equiv="Content-Type" content="text/html;charset=UTF-8"/> <meta name="keywords" content="python web application" />

<meta name="description" content="pyramid web application" /> <link rel="shortcut icon"

href="/static/favicon.ico" /> <link rel="stylesheet"

href="/static/pylons.css"

type="text/css" media="screen" charset="utf-8" />

<!--[if lte IE 6]> <link rel="stylesheet"

href="/static/ie6.css"

type="text/css" media="screen" charset="utf-8" /> <![endif]-->

</head>

<body>

<div id="wrap">

<div id="top-small">

<div class="top-small align-center">

<div>

<img width="220" height="50" alt="pyramid" src="/static/pyramid-small.png" />

</div>

423

36. ZODB + TRAVERSAL WIKI TUTORIAL

</div>

</div>

<div id="middle">

<div class="middle align-right">

<div id="left" class="app-welcome align-left"> <b>Login</b><br/>

<span tal:replace="message"/>

</div>

<div id="right" class="app-welcome align-right"></div>

</div>

</div>

<div id="bottom">

<div class="bottom">

<form action="${url}" method="post">

<input type="hidden" name="came_from" value="${came_from}"/> <input type="text" name="login" value="${login}"/><br/> <input type="password" name="password"

value="${password}"/><br/>

<input type="submit" name="form.submitted" value="Log In"/>

</form>

</div>

</div>

</div>

<div id="footer"> <div class="footer"

>© Copyright 2008-2011, Agendaless Consulting.</div>

</div>

</body>

</html>

36.7.8 Change view.pt and edit.pt

We’ll also need to change our edit.pt and view.pt templates to display a “Logout” link if someone is logged in. This link will invoke the logout view.

To do so we’ll add this to both templates within the <div id="right" class="app-welcome align-right"> div:

<span tal:condition="logged_in">

<a href="${request.application_url}/logout">Logout</a>

</span>

424

36.7. ADDING AUTHORIZATION

36.7.9 See Our Changes To views.py and our Templates

Our views.py module will look something like this when we’re done:

1

from docutils.core import publish_parts

2

import re

3

 

4

from pyramid.httpexceptions import HTTPFound

5

 

6

from pyramid.view import (

7view_config,

8forbidden_view_config,

9)

10

11from pyramid.security import (

12authenticated_userid,

13remember,

14forget,

15)

16

17from .security import USERS

18from .models import Page

19

20# regular expression used to find WikiWords

21wikiwords = re.compile(r"\b([A-Z]\w+[A-Z]+\w+)")

22

23@view_config(context=’.models.Wiki’, permission=’view’)

24def view_wiki(context, request):

25return HTTPFound(location=request.resource_url(context, ’FrontPage’))

26

 

27

@view_config(context=’.models.Page’,

28

renderer=’templates/view.pt’, permission=’view’)

29def view_page(context, request):

30wiki = context.__parent__

31

32def check(match):

33word = match.group(1)

34if word in wiki:

35

page = wiki[word]

36

view_url = request.resource_url(page)

37return ’<a href="%s">%s</a>’ % (view_url, word)

38else:

39

add_url = request.application_url + ’/add_page/’ + word

40

return ’<a href="%s">%s</a>’ % (add_url, word)

41

 

42

content = publish_parts(context.data, writer_name=’html’)[’html_body’]

425

36. ZODB + TRAVERSAL WIKI TUTORIAL

43content = wikiwords.sub(check, content)

44edit_url = request.resource_url(context, ’edit_page’)

45

 

46

logged_in = authenticated_userid(request)

47

 

48

return dict(page = context, content = content, edit_url = edit_url,

49

logged_in = logged_in)

50

 

51

@view_config(name=’add_page’, context=’.models.Wiki’,

52

renderer=’templates/edit.pt’,

53

permission=’edit’)

54def add_page(context, request):

55name = request.subpath[0]

56if ’form.submitted’ in request.params:

57body = request.params[’body’]

58page = Page(body)

59page.__name__ = name

60page.__parent__ = context

61context[name] = page

62return HTTPFound(location = request.resource_url(page))

63save_url = request.resource_url(context, ’add_page’, name)

64page = Page(’’)

65page.__name__ = name

66page.__parent__ = context

67

 

68

logged_in = authenticated_userid(request)

69

 

70

return dict(page = page, save_url = save_url, logged_in = logged_in)

71

 

72

@view_config(name=’edit_page’, context=’.models.Page’,

73

renderer=’templates/edit.pt’,

74

permission=’edit’)

75def edit_page(context, request):

76if ’form.submitted’ in request.params:

77context.data = request.params[’body’]

78return HTTPFound(location = request.resource_url(context))

79

 

80

logged_in = authenticated_userid(request)

81

 

82

return dict(page = context,

83

save_url = request.resource_url(context, ’edit_page’),

84

logged_in = logged_in)

85

86 @view_config(context=’.models.Wiki’, name=’login’, 87 renderer=’templates/login.pt’)

88 @forbidden_view_config(renderer=’templates/login.pt’)

426

36.7. ADDING AUTHORIZATION

89def login(request):

90login_url = request.resource_url(request.context, ’login’)

91referrer = request.url

92if referrer == login_url:

93referrer = ’/’ # never use the login form itself as came_from

94came_from = request.params.get(’came_from’, referrer)

95message = ’’

96login = ’’

97password = ’’

98if ’form.submitted’ in request.params:

99login = request.params[’login’]

100password = request.params[’password’]

101if USERS.get(login) == password:

102

headers = remember(request,

login)

103

return HTTPFound(location =

came_from,

104

headers = headers)

105

message = ’Failed login’

 

106

107return dict(

108message = message,

109url = request.application_url + ’/login’,

110came_from = came_from,

111login = login,

112password = password,

113)

114

115@view_config(context=’.models.Wiki’, name=’logout’)

116def logout(request):

117headers = forget(request)

118return HTTPFound(location = request.resource_url(request.context),

119

headers = headers)

Our edit.pt template will look something like this when we’re done:

1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"

2"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

3

<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en"

4

xmlns:tal="http://xml.zope.org/namespaces/tal">

5

<head>

6

<title>${page.__name__} - Pyramid tutorial wiki (based on

7TurboGears 20-Minute Wiki)</title>

8 <meta http-equiv="Content-Type" content="text/html;charset=UTF-8"/>

9<meta name="keywords" content="python web application" />

10<meta name="description" content="pyramid web application" />

11<link rel="shortcut icon"

12href="/static/favicon.ico" />

427

36. ZODB + TRAVERSAL WIKI TUTORIAL

13<link rel="stylesheet"

14href="/static/pylons.css"

15type="text/css" media="screen" charset="utf-8" />

16<!--[if lte IE 6]>

17<link rel="stylesheet"

18href="/static/ie6.css"

19type="text/css" media="screen" charset="utf-8" />

20<![endif]-->

21</head>

22<body>

23<div id="wrap">

24<div id="top-small">

25<div class="top-small align-center">

26<div>

27<img width="220" height="50" alt="pyramid"

28src="/static/pyramid-small.png" />

29</div>

30</div>

31</div>

32<div id="middle">

33<div class="middle align-right">

34<div id="left" class="app-welcome align-left">

35Editing <b><span tal:replace="page.__name__">Page Name

36Goes Here</span></b><br/>

37You can return to the

38<a href="${request.application_url}">FrontPage</a>.<br/>

39</div>

40<div id="right" class="app-welcome align-right">

41<span tal:condition="logged_in">

42

<a href="${request.application_url}/logout">Logout</a>

43</span>

44</div>

45</div>

46</div>

47<div id="bottom">

48<div class="bottom">

49<form action="${save_url}" method="post">

50<textarea name="body" tal:content="page.data" rows="10"

51

cols="60"/><br/>

52<input type="submit" name="form.submitted" value="Save"/>

53</form>

54</div>

55</div>

56</div>

57<div id="footer">

58<div class="footer"

428

36.7. ADDING AUTHORIZATION

59>© Copyright 2008-2011, Agendaless Consulting.</div>

60</div>

61</body>

62</html>

Our view.pt template will look something like this when we’re done:

1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"

2"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

3

<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en"

4

xmlns:tal="http://xml.zope.org/namespaces/tal">

5

<head>

6

<title>${page.__name__} - Pyramid tutorial wiki (based on

7TurboGears 20-Minute Wiki)</title>

8 <meta http-equiv="Content-Type" content="text/html;charset=UTF-8"/>

9<meta name="keywords" content="python web application" />

10<meta name="description" content="pyramid web application" />

11<link rel="shortcut icon"

12href="/static/favicon.ico" />

13<link rel="stylesheet"

14href="/static/pylons.css"

15type="text/css" media="screen" charset="utf-8" />

16<!--[if lte IE 6]>

17<link rel="stylesheet"

18href="/static/ie6.css"

19type="text/css" media="screen" charset="utf-8" />

20<![endif]-->

21</head>

22<body>

23<div id="wrap">

24<div id="top-small">

25<div class="top-small align-center">

26<div>

27<img width="220" height="50" alt="pyramid"

28src="/static/pyramid-small.png" />

29</div>

30</div>

31</div>

32<div id="middle">

33<div class="middle align-right">

34<div id="left" class="app-welcome align-left">

35Viewing <b><span tal:replace="page.__name__">Page Name

36Goes Here</span></b><br/>

37You can return to the

38<a href="${request.application_url}">FrontPage</a>.<br/>

39</div>

429

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