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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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# Module: dispatch.request
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# Author: Matt Giuca
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Builds an IVLE request object from a mod_python request object.
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See design notes/apps/dispatch.txt for a full specification of this request
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import mod_python.Session
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import mod_python.Cookie
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import mod_python.util
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# This needs to be importable from outside Apache.
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# Builds an IVLE request object from a mod_python request object.
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# See design notes/apps/dispatch.txt for a full specification of this request
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from mod_python import (util, Session, Cookie)
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from ivle.webapp.base.plugins import CookiePlugin
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import plugins.console # XXX: Relies on www/ being in the Python path.
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"""An IVLE request object. This is presented to the IVLE apps as a way of
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String. Response "Location" header value. Used with HTTP redirect
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String. HTML page title. Used if write_html_head_foot is True, in
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the HTML title element text.
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List of strings. Write a list of URLs to CSS files here, and they
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will be incorporated as <link rel="stylesheet" type="text/css">
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in the head, if write_html_head_foot is True.
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This is the propper way to specify functions that need to run at
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write_html_head_foot (write)
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Boolean. If True, dispatch assumes that this is an XHTML page, and
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will immediately write a full HTML head, open the body element,
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and write heading contents to the page, before any bytes are
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written. It will then write footer contents and close the body and
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html elements at the end of execution.
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This value should be set to true by all applications for all HTML
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output (unless there is a good reason, eg. exec). The
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applications should therefore output HTML content assuming that
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it will be written inside the body tag. Do not write opening or
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closing <html> or <body> tags.
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# Special code for an OK response.
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HTTP_INSUFFICIENT_STORAGE = 507
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HTTP_NOT_EXTENDED = 510
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def __init__(self, req, config):
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"""Create an IVLE request from a mod_python one.
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def __init__(self, req, write_html_head):
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"""Builds an IVLE request object from a mod_python request object.
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This results in an object with all of the necessary methods and
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@param req: A mod_python request.
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@param config: An IVLE configuration.
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req: A mod_python request object.
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write_html_head: Function which is called when writing the automatic
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HTML header. Accepts a single argument, the IVLE request object.
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# Methods are mostly wrappers around the Apache request object
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self.apache_req = req
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self.func_write_html_head = write_html_head
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self.headers_written = False
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# Determine if the browser used the public host name to make the
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# request (in which case we are in "public mode")
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if req.hostname == config['urls']['public_host']:
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if req.hostname == ivle.conf.public_host:
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self.publicmode = True
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self.publicmode = False
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self.uri = req.uri
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# Split the given path into the app (top-level dir) and sub-path
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# (after first stripping away the root directory)
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path = self.unmake_path(req.uri)
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path = ivle.util.unmake_path(req.uri)
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(self.app, self.path) = (ivle.util.split_path(path))
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self.hostname = req.hostname
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self.headers_in = req.headers_in
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self.headers_out = req.headers_out
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# Open a database connection and transaction, keep it around for users
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# of the Request object to use
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self.store = ivle.database.get_store(config)
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# Default values for the output members
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self.status = Request.HTTP_OK
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self.content_type = None # Use Apache's default
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self.location = None
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self.title = None # Will be set by dispatch before passing to app
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self.scripts = []
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self.scripts_init = []
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self.write_html_head_foot = False
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# In some cases we don't want the template JS (such as the username
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# and public FQDN) in the output HTML. In that case, set this to 0.
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self.write_javascript_settings = True
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self.got_common_vars = False
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def __writeheaders(self):
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"""Writes out the HTTP and HTML headers before any real data is
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self.headers_written = True
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# app is the App object for the chosen app
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app = ivle.conf.apps.app_url[self.app]
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# Write any final modifications to header content
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if app and app.useconsole and self.user:
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plugins.console.insert_scripts_styles(self.scripts, self.styles, \
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# Prepare the HTTP and HTML headers before the first write is made
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if self.content_type != None:
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self.apache_req.status = self.status
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if self.location != None:
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self.apache_req.headers_out['Location'] = self.location
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if self.write_html_head_foot:
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# Write the HTML header, pass "self" (request object)
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self.func_write_html_head(self)
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def ensure_headers_written(self):
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"""Writes out the HTTP and HTML headers if they haven't already been
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# This includes binary strings.
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self.apache_req.write(string, flush)
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"""Log out the current user by destroying the session state.
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Then redirect to the top-level IVLE page."""
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if hasattr(self, 'session'):
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self.session.invalidate()
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self.session.delete()
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# Invalidates all IVLE cookies
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all_cookies = mod_python.Cookie.get_cookies(self)
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# Create cookies for plugins that might request them.
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for plugin in self.config.plugin_index[CookiePlugin]:
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for cookie in plugin.cookies:
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self.add_cookie(mod_python.Cookie.Cookie(cookie, '',
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expires=1, path='/'))
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self.throw_redirect(self.make_path(''))
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"""Flushes the output buffer."""
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self.apache_req.flush()
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return self.apache_req.read(len)
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def throw_error(self, httpcode, message=None):
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"""Writes out an HTTP error of the specified code. Raises an exception
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which is caught by the dispatch or web server, so any code following
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this call will not be executed.
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httpcode: An HTTP response status code. Pass a constant from the
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raise ivle.util.IVLEError(httpcode, message)
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def throw_redirect(self, location):
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"""Writes out an HTTP redirect to the specified URL. Raises an
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exception which is caught by the dispatch or web server, so any
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httpcode: An HTTP response status code. Pass a constant from the
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# Note: location may be a unicode, but it MUST only have ASCII
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# characters (non-ascii characters should be URL-encoded).
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mod_python.util.redirect(self.apache_req, location.encode("ascii"))
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mod_python.util.redirect(self.apache_req, location)
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def add_cookie(self, cookie, value=None, **attributes):
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"""Inserts a cookie into this request object's headers."""
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if value is None:
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mod_python.Cookie.add_cookie(self.apache_req, cookie)
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Cookie.add_cookie(self.apache_req, cookie)
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mod_python.Cookie.add_cookie(self.apache_req, cookie, value, **attributes)
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def make_path(self, path):
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"""Prepend the IVLE URL prefix to the given path.
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This is used when generating URLs to send to the client.
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This method is DEPRECATED. We no longer support use of a prefix.
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return os.path.join(self.config['urls']['root'], path)
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def unmake_path(self, path):
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"""Strip the IVLE URL prefix from the given path, if present.
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Also normalises the path.
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This method is DEPRECATED. We no longer support use of a prefix.
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path = os.path.normpath(path)
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root = os.path.normpath(self.config['urls']['root'])
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if path.startswith(root):
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path = path[len(root):]
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# Take out the slash as well
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if len(path) > 0 and path[0] == os.sep:
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Cookie.add_cookie(self.apache_req, cookie, value, **attributes)
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def get_session(self):
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"""Returns a mod_python Session object for this request.
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Note that this is dependent on mod_python and may need to change
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interface if porting away from mod_python.
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IMPORTANT: Call unlock() on the session as soon as you are done with
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it! If you don't, all other requests will block!
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interface if porting away from mod_python."""
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# Cache the session object and set the timeout to 24 hours.
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if not hasattr(self, 'session'):
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self.session = mod_python.Session.FileSession(self.apache_req,
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self.session = Session.FileSession(self.apache_req,
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timeout = 60 * 60 * 24)
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return self.session
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interface if porting away from mod_python."""
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# Cache the fieldstorage object
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if not hasattr(self, 'fields'):
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self.fields = mod_python.util.FieldStorage(self.apache_req)
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self.fields = util.FieldStorage(self.apache_req)
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return self.fields
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def get_cgi_environ(self):