source: package_branches/invirt-web/cherrypy/code/view.py @ 2518

Last change on this file since 2518 was 2518, checked in by price, 15 years ago

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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       
56        # Replace the current handler.
57        cherrypy.request.template = t = lookup.get_template(filename)
58        cherrypy.request.handler = MakoHandler(t, cherrypy.request.handler, content_type)
59
60cherrypy.tools.mako = cherrypy.Tool('on_start_resource', MakoLoader())
61
62def revertStandardError():
63    """Move stderr to stdout, and return the contents of the old stderr."""
64    errio = sys.stderr
65    if not isinstance(errio, StringIO):
66        return ''
67    sys.stderr = sys.stdout
68    errio.seek(0)
69    return errio.read()
70
71def catchStderr():
72    old_handler = cherrypy.request.handler
73    def wrapper(*args, **kwargs):
74        sys.stderr = StringIO()
75        ret = old_handler(*args, **kwargs)
76        e = revertStandardError()
77        if e:
78            if isinstance(ret, dict):
79                ret["error_text"] = e
80        return ret
81    if old_handler:
82        cherrypy.request.handler = wrapper
83
84cherrypy.tools.catch_stderr = cherrypy.Tool('before_handler', catchStderr)
85
86class JSONEncoder(simplejson.JSONEncoder):
87        def default(self, obj):
88                if isinstance(obj, datetime.datetime):
89                        return str(obj)
90                elif isinstance(obj, decimal.Decimal):
91                        return float(obj)
92                else:
93                        return simplejson.JSONEncoder.default(self, obj)
94
95def jsonify_tool_callback(*args, **kwargs):
96    if not cherrypy.request.cached:
97        response = cherrypy.response
98        response.headers['Content-Type'] = 'text/javascript'
99        response.body = JSONEncoder().iterencode(response.body)
100
101cherrypy.tools.jsonify = cherrypy.Tool('before_finalize', jsonify_tool_callback, priority=30)
102
103def require_login():
104    """If the user isn't logged in, raise 403 with an error."""
105    if cherrypy.request.login is False:
106        raise cherrypy.HTTPError(403,
107            "You are not authorized to access that resource")
108
109cherrypy.tools.require_login = cherrypy.Tool('on_start_resource', require_login, priority=150)
110
111def require_POST():
112    """If the request isn't a POST request, raise 405 Method Not Allowed"""
113    if cherrypy.request.method != "POST":
114        raise cherrypy.HTTPError(405,
115                                 "You must submit this request with POST")
116
117cherrypy.tools.require_POST = cherrypy.Tool('on_start_resource', require_POST, priority=150)
118
119def remote_user_login():
120    """Get the current user based on the SSL or GSSAPI environment variables"""
121    environ = cherrypy.request.wsgi_environ
122    user = environ.get('REMOTE_USER')
123    if user is None:
124        return
125    else:
126        cherrypy.request.login = None # clear what cherrypy put there
127
128    if environ.get('AUTH_TYPE') == 'Negotiate':
129        # Convert the krb5 principal into a krb4 username
130        if not user.endswith('@%s' % config.kerberos.realm):
131            cherrypy.request.login = False # failed to login
132        else:
133            cherrypy.request.login = user.split('@')[0].replace('/', '.')
134    else:
135        cherrypy.request.login = user
136
137cherrypy.tools.remote_user_login = cherrypy.Tool('on_start_resource', remote_user_login, priority=50)
138
139def invirtwebstate_init():
140    """Initialize the cherrypy.request.state object from Invirt"""
141    if not hasattr(cherrypy.request, "state"):
142        cherrypy.request.state = State(cherrypy.request.login)
143
144cherrypy.tools.invirtwebstate = cherrypy.Tool('on_start_resource', invirtwebstate_init, priority=100)
145
146class View(object):
147    _cp_config = {'tools.mako.directories': [os.path.join(os.path.dirname(__file__),'templates')]}
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