static.py

python web programming 部分

#
# $Workfile: Static.py $ $Revision: 6 $
# $Date: 8/29/01 4:28a $ $Author: Sholden $
#
import Web
import os
from mimetypes import guess_type
from ErrorPages import Error404Page, Error405Page, Error415Page


class Page(Web.Page):
    """Handle content present as a file in the virtual web filestore.

    Note that a whole passel of stuff is inherited, from Web.Page,
    much of which is neither required nor used because the content
    is simply dragged from a file and squirted down to the client.
    """

    def Generate(self):
        """Generate static content by squirting file content."""
        if self.op.upper() != "GET":
            return Error405Page(self.op, self.path, self.query,
                    self.session, self.headers,
                    oHeaders=self.Headers(), Realm=self.Realm()).Generate()
        else:
            auth = self.Authenticate()
            if auth:
                return auth
            fname = self.path[-1]
            ext = os.path.splitext(fname)[1]
            mimetype, encoding = guess_type(fname)
            if encoding:
                enchdr = "Content-Encoding: %s\r\n" % encoding
            else:
                enchdr = ""
            if not mimetype:
                return Error415Page(self.op, self.path,
                        self.query, self.session, self.headers,
                        oHeaders=self.Headers(), Realm=self.Realm()).Generate()
            try:
                filepath = os.sep.join(self.initpath + self.path)
                f = open(filepath, "rb")
                img = f.read()
                return \
"""HTTP/1.0 200 OK Content as requested
Content-Type: %s
Content-Length: %s
%s
%s""" % (mimetype, len(img), enchdr, img)
            except IOError:
                return Error404Page(self.op, self.path,
                        self.query, self.session, self.headers,
                        oHeaders=self.Headers(), Realm=self.Realm()).Generate()