code/view.py

   1 import os, sys
   2
   3 import cherrypy
   4 from mako.template import Template
   5 from mako.lookup import TemplateLookup
   6 import simplejson
   7 import datetime, decimal
   8 from StringIO import StringIO
   9 from invirt.config import structs as config
  10 from webcommon import State
  11
  12 class 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
  27 class 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
  60 cherrypy.tools.mako = cherrypy.Tool('on_start_resource', MakoLoader())
  61
  62 def 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
  71 def 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
  84 cherrypy.tools.catch_stderr = cherrypy.Tool('before_handler', catchStderr)
  85
  86 class 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
  95 def 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
 101 cherrypy.tools.jsonify = cherrypy.Tool('before_finalize', jsonify_tool_callback, priority=30)
 102
 103 def require_login():
 104     """If the user isn't logged in, raise 403 with an error."""
 105     if not cherrypy.request.login:
 106         raise cherrypy.HTTPError(403,
 107             "You are not authorized to access that resource")
 108
 109 cherrypy.tools.require_login = cherrypy.Tool('on_start_resource', require_login, priority=150)
 110
 111 def 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
 117 cherrypy.tools.require_POST = cherrypy.Tool('on_start_resource', require_POST, priority=150)
 118
 119 def 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         cherrypy.request.login = None
 125         return
 126
 127     if environ.get('AUTH_TYPE') == 'Negotiate':
 128         # Convert the krb5 principal into a krb4 username
 129         if not user.endswith('@%s' % config.kerberos.realm):
 130             cherrypy.request.login = None
 131         else:
 132             cherrypy.request.login = user.split('@')[0].replace('/', '.')
 133     else:
 134         cherrypy.request.login = user
 135
 136 cherrypy.tools.remote_user_login = cherrypy.Tool('on_start_resource', remote_user_login, priority=50)
 137
 138 def invirtwebstate_init():
 139     """Initialize the cherrypy.request.state object from Invirt"""
 140     if not hasattr(cherrypy.request, "state"):
 141         cherrypy.request.state = State(cherrypy.request.login)
 142
 143 cherrypy.tools.invirtwebstate = cherrypy.Tool('on_start_resource', invirtwebstate_init, priority=100)
 144
 145 class View(object):
 146     _cp_config = {'tools.mako.directories': [os.path.join(os.path.dirname(__file__),'templates')]}