Python IRequest.setETag方法代码示例

# 需要导入模块: from nevow.inevow import IRequest [as 别名]
# 或者: from nevow.inevow.IRequest import setETag [as 别名]
    def render_GET(self, ctx):
        req = IRequest(ctx)
        # This is where all of the directory-related ?t=* code goes.
        t = get_arg(req, "t", "").strip()

        # t=info contains variable ophandles, t=rename-form contains the name
        # of the child being renamed. Neither is allowed an ETag.
        FIXED_OUTPUT_TYPES =  ["", "json", "uri", "readonly-uri"]
        if not self.node.is_mutable() and t in FIXED_OUTPUT_TYPES:
            si = self.node.get_storage_index()
            if si and req.setETag('DIR:%s-%s' % (base32.b2a(si), t or "")):
                return ""

        if not t:
            # render the directory as HTML, using the docFactory and Nevow's
            # whole templating thing.
            return DirectoryAsHTML(self.node,
                                   self.client.mutable_file_default)

        if t == "json":
            return DirectoryJSONMetadata(ctx, self.node)
        if t == "info":
            return MoreInfo(self.node)
        if t == "uri":
            return DirectoryURI(ctx, self.node)
        if t == "readonly-uri":
            return DirectoryReadonlyURI(ctx, self.node)
        if t == 'rename-form':
            return RenameForm(self.node)

        raise WebError("GET directory: bad t=%s" % t)

# 需要导入模块: from nevow.inevow import IRequest [as 别名]
# 或者: from nevow.inevow.IRequest import setETag [as 别名]
    def render_GET(self, ctx):
        req = IRequest(ctx)
        t = get_arg(req, "t", "").strip()

        # t=info contains variable ophandles, so is not allowed an ETag.
        FIXED_OUTPUT_TYPES = ["", "json", "uri", "readonly-uri"]
        if not self.node.is_mutable() and t in FIXED_OUTPUT_TYPES:
            # if the client already has the ETag then we can
            # short-circuit the whole process.
            si = self.node.get_storage_index()
            if si and req.setETag('%s-%s' % (base32.b2a(si), t or "")):
                return ""

        if not t:
            # just get the contents
            # the filename arrives as part of the URL or in a form input
            # element, and will be sent back in a Content-Disposition header.
            # Different browsers use various character sets for this name,
            # sometimes depending upon how language environment is
            # configured. Firefox sends the equivalent of
            # urllib.quote(name.encode("utf-8")), while IE7 sometimes does
            # latin-1. Browsers cannot agree on how to interpret the name
            # they see in the Content-Disposition header either, despite some
            # 11-year old standards (RFC2231) that explain how to do it
            # properly. So we assume that at least the browser will agree
            # with itself, and echo back the same bytes that we were given.
            filename = get_arg(req, "filename", self.name) or "unknown"
            d = self.node.get_best_readable_version()
            d.addCallback(lambda dn: FileDownloader(dn, filename))
            return d
        if t == "json":
            # We do this to make sure that fields like size and
            # mutable-type (which depend on the file on the grid and not
            # just on the cap) are filled in. The latter gets used in
            # tests, in particular.
            #
            # TODO: Make it so that the servermap knows how to update in
            # a mode specifically designed to fill in these fields, and
            # then update it in that mode.
            if self.node.is_mutable():
                d = self.node.get_servermap(MODE_READ)
            else:
                d = defer.succeed(None)
            if self.parentnode and self.name:
                d.addCallback(lambda ignored:
                    self.parentnode.get_metadata_for(self.name))
            else:
                d.addCallback(lambda ignored: None)
            d.addCallback(lambda md: FileJSONMetadata(ctx, self.node, md))
            return d
        if t == "info":
            return MoreInfo(self.node)
        if t == "uri":
            return FileURI(ctx, self.node)
        if t == "readonly-uri":
            return FileReadOnlyURI(ctx, self.node)
        raise WebError("GET file: bad t=%s" % t)

# 需要导入模块: from nevow.inevow import IRequest [as 别名]
# 或者: from nevow.inevow.IRequest import setETag [as 别名]
 def setETag(self, ctx, t):
     """Set the ETag on the response. If this matches a conditional
     request, return True to short-circuit the request"""
     req = IRequest(ctx)
     if not self.node.is_mutable():
         # If the client already has the ETag then we can
         # short-circuit the whole process.
         si = self.node.get_storage_index()
         if si and req.setETag('CHK:%s-%s' % (base32.b2a(si), t or "")):
             return True
     return False

# 需要导入模块: from nevow.inevow import IRequest [as 别名]
# 或者: from nevow.inevow.IRequest import setETag [as 别名]
    def renderHTTP(self, ctx):
        req = IRequest(ctx)
        gte = static.getTypeAndEncoding
        ctype, encoding = gte(self.filename,
                              static.File.contentTypes,
                              static.File.contentEncodings,
                              defaultType="text/plain")
        req.setHeader("content-type", ctype)
        if encoding:
            req.setHeader("content-encoding", encoding)

        if boolean_of_arg(get_arg(req, "save", "False")):
            # tell the browser to save the file rather display it we don't
            # try to encode the filename, instead we echo back the exact same
            # bytes we were given in the URL. See the comment in
            # FileNodeHandler.render_GET for the sad details.
            req.setHeader("content-disposition",
                          'attachment; filename="%s"' % self.filename)

        filesize = self.filenode.get_size()
        assert isinstance(filesize, (int,long)), filesize
        first, size = 0, None
        contentsize = filesize
        req.setHeader("accept-ranges", "bytes")
        if not self.filenode.is_mutable():
            # TODO: look more closely at Request.setETag and how it interacts
            # with a conditional "if-etag-equals" request, I think this may
            # need to occur after the setResponseCode below
            si = self.filenode.get_storage_index()
            if si:
                req.setETag(base32.b2a(si))
        # TODO: for mutable files, use the roothash. For LIT, hash the data.
        # or maybe just use the URI for CHK and LIT.
        rangeheader = req.getHeader('range')
        if rangeheader:
            ranges = self.parse_range_header(rangeheader)

            # ranges = None means the header didn't parse, so ignore
            # the header as if it didn't exist.  If is more than one
            # range, then just return the first for now, until we can
            # generate multipart/byteranges.
            if ranges is not None:
                first, last = ranges[0]

                if first >= filesize:
                    raise WebError('First beyond end of file',
                                   http.REQUESTED_RANGE_NOT_SATISFIABLE)
                else:
                    first = max(0, first)
                    last = min(filesize-1, last)

                    req.setResponseCode(http.PARTIAL_CONTENT)
                    req.setHeader('content-range',"bytes %s-%s/%s" %
                                  (str(first), str(last),
                                   str(filesize)))
                    contentsize = last - first + 1
                    size = contentsize

        req.setHeader("content-length", str(contentsize))
        if req.method == "HEAD":
            return ""

        finished = []
        def _request_finished(ign):
            finished.append(True)
        req.notifyFinish().addBoth(_request_finished)

        d = self.filenode.read(req, first, size)

        def _finished(ign):
            if not finished:
                req.finish()
        def _error(f):
            lp = log.msg("error during GET", facility="tahoe.webish", failure=f,
                         level=log.UNUSUAL, umid="xSiF3w")
            if finished:
                log.msg("but it's too late to tell them", parent=lp,
                        level=log.UNUSUAL, umid="j1xIbw")
                return
            req._tahoe_request_had_error = f # for HTTP-style logging
            if req.startedWriting:
                # The content-type is already set, and the response code has
                # already been sent, so we can't provide a clean error
                # indication. We can emit text (which a browser might
                # interpret as something else), and if we sent a Size header,
                # they might notice that we've truncated the data. Keep the
                # error message small to improve the chances of having our
                # error response be shorter than the intended results.
                #
                # We don't have a lot of options, unfortunately.
                req.write("problem during download\n")
                req.finish()
            else:
                # We haven't written anything yet, so we can provide a
                # sensible error message.
                eh = MyExceptionHandler()
                eh.renderHTTP_exception(ctx, f)
        d.addCallbacks(_finished, _error)
        return req.deferred