source: package_branches/invirt-web/cherrypy/code/view.py @ 2522

Last change on this file since 2522 was 2522, checked in by price, 15 years ago

cut uninformative comment and blank line

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1import os, sys
2
3import cherrypy
4from mako.template import Template
5from mako.lookup import TemplateLookup
6import simplejson
7import datetime, decimal
8from StringIO import StringIO
9from invirt.config import structs as config
10from webcommon import State
11
12class MakoHandler(cherrypy.dispatch.LateParamPageHandler):
13    """Callable which sets response.body."""
14   
15    def __init__(self, template, next_handler, content_type='text/html; charset=utf-8'):
16        self.template = template
17        self.next_handler = next_handler
18        self.content_type = content_type
19   
20    def __call__(self):
21        env = globals().copy()
22        env.update(self.next_handler())
23        cherrypy.response.headers['Content-Type'] = self.content_type
24        return self.template.render(**env)
25       
26
27class MakoLoader(object):
28   
29    def __init__(self):
30        self.lookups = {}
31
32    def get_lookup(self, directories, module_directory=None,
33                     collection_size=-1, imports=[], **kwargs):
34        # Find the appropriate template lookup.
35        key = (tuple(directories), module_directory)
36        try:
37            lookup = self.lookups[key]
38        except KeyError:
39            lookup = TemplateLookup(directories=directories,
40                                    module_directory=module_directory,
41                                    collection_size=collection_size,
42                                    default_filters=['decode.utf8'],
43                                    input_encoding='utf-8',
44                                    output_encoding='utf-8',
45                                    imports=imports,
46                                    )
47            self.lookups[key] = lookup
48        return lookup
49
50    def __call__(self, filename, directories, module_directory=None,
51                 collection_size=-1, content_type='text/html; charset=utf-8',
52                 imports=[]):
53        cherrypy.request.lookup = lookup = self.get_lookup(directories, module_directory,
54                                                           collection_size, imports)
55        cherrypy.request.template = t = lookup.get_template(filename)
56        cherrypy.request.handler = MakoHandler(t, cherrypy.request.handler, content_type)
57
58cherrypy.tools.mako = cherrypy.Tool('on_start_resource', MakoLoader())
59
60def revertStandardError():
61    """Move stderr to stdout, and return the contents of the old stderr."""
62    errio = sys.stderr
63    if not isinstance(errio, StringIO):
64        return ''
65    sys.stderr = sys.stdout
66    errio.seek(0)
67    return errio.read()
68
69def catchStderr():
70    old_handler = cherrypy.request.handler
71    def wrapper(*args, **kwargs):
72        sys.stderr = StringIO()
73        ret = old_handler(*args, **kwargs)
74        e = revertStandardError()
75        if e:
76            if isinstance(ret, dict):
77                ret["error_text"] = e
78        return ret
79    if old_handler:
80        cherrypy.request.handler = wrapper
81
82cherrypy.tools.catch_stderr = cherrypy.Tool('before_handler', catchStderr)
83
84class JSONEncoder(simplejson.JSONEncoder):
85        def default(self, obj):
86                if isinstance(obj, datetime.datetime):
87                        return str(obj)
88                elif isinstance(obj, decimal.Decimal):
89                        return float(obj)
90                else:
91                        return simplejson.JSONEncoder.default(self, obj)
92
93def jsonify_tool_callback(*args, **kwargs):
94    if not cherrypy.request.cached:
95        response = cherrypy.response
96        response.headers['Content-Type'] = 'text/javascript'
97        response.body = JSONEncoder().iterencode(response.body)
98
99cherrypy.tools.jsonify = cherrypy.Tool('before_finalize', jsonify_tool_callback, priority=30)
100
101def require_login():
102    """If the user isn't logged in, raise 403 with an error."""
103    if not cherrypy.request.login:
104        raise cherrypy.HTTPError(403,
105            "You are not authorized to access that resource")
106
107cherrypy.tools.require_login = cherrypy.Tool('on_start_resource', require_login, priority=150)
108
109def require_POST():
110    """If the request isn't a POST request, raise 405 Method Not Allowed"""
111    if cherrypy.request.method != "POST":
112        raise cherrypy.HTTPError(405,
113                                 "You must submit this request with POST")
114
115cherrypy.tools.require_POST = cherrypy.Tool('on_start_resource', require_POST, priority=150)
116
117def remote_user_login():
118    """Get the current user based on the SSL or GSSAPI environment variables"""
119    environ = cherrypy.request.wsgi_environ
120    user = environ.get('REMOTE_USER')
121    if user is None:
122        cherrypy.request.login = None
123        return
124
125    if environ.get('AUTH_TYPE') == 'Negotiate':
126        # Convert the krb5 principal into a krb4 username
127        if not user.endswith('@%s' % config.kerberos.realm):
128            cherrypy.request.login = None
129        else:
130            cherrypy.request.login = user.split('@')[0].replace('/', '.')
131    else:
132        cherrypy.request.login = user
133
134cherrypy.tools.remote_user_login = cherrypy.Tool('on_start_resource', remote_user_login, priority=50)
135
136def invirtwebstate_init():
137    """Initialize the cherrypy.request.state object from Invirt"""
138    if not hasattr(cherrypy.request, "state"):
139        cherrypy.request.state = State(cherrypy.request.login)
140
141cherrypy.tools.invirtwebstate = cherrypy.Tool('on_start_resource', invirtwebstate_init, priority=100)
142
143class View(object):
144    _cp_config = {'tools.mako.directories': [os.path.join(os.path.dirname(__file__),'templates')]}
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