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import os.path
__all__ = []
try:
basestring
except NameError:
basestring = str
__all__.append("StaticContent")
class StaticContent(object):
"""
This wsgi application provides static content on whatever request it
receives with method GET or HEAD (content stripped). If not present, a
content-length header is computed.
"""
def __init__(self, status, headers, content, anymethod=False):
"""
@type status: str
@param status: is the HTTP status returned to the browser (ex: "200 OK")
@type headers: list
@param headers: is a list of C{(header, value)} pairs being delivered as
HTTP headers
@type content: bytes
@param content: contains the data to be delivered to the client. It is
either a string or some kind of iterable yielding strings.
@type anymethod: boolean
@param anymethod: determines whether any request method should be
answered with this response instead of a 501
"""
assert isinstance(status, str)
assert isinstance(headers, list)
assert isinstance(content, bytes) or hasattr(content, "__iter__")
self.status = status
self.headers = headers
self.anymethod = anymethod
length = -1
if isinstance(content, bytes):
self.content = [content]
length = len(content)
else:
self.content = content
if isinstance(self.content, list):
length = sum(map(len, self.content))
if length >= 0:
if not [v for h, v in headers if h.lower() == "content-length"]:
headers.append(("Content-length", str(length)))
def __call__(self, environ, start_response):
"""wsgi interface"""
assert isinstance(environ, dict)
if environ["REQUEST_METHOD"].upper() not in ["GET", "HEAD"] and \
not self.anymethod:
resp = b"Request method not implemented"
start_response("501 Not Implemented",
[("Content-length", str(len(resp)))])
return [resp]
start_response(self.status, list(self.headers))
if environ["REQUEST_METHOD"].upper() == "HEAD":
return []
return self.content
__all__.append("StaticFile")
class StaticFile(object):
"""
This wsgi application provides the content of a static file on whatever
request it receives with method GET or HEAD (content stripped). If not
present, a content-length header is computed.
"""
def __init__(self, filelike, status="200 OK", headers=list(),
blocksize=4096):
"""
@type status: str
@param status: is the HTTP status returned to the browser
@type headers: [(str, str)]
@param headers: is a list of C{(header, value)} pairs being delivered as
HTTP headers
@type filelike: str or file-like
@param filelike: may either be an path in the local file system or a
file-like that must support C{read(size)} and C{seek(0)}. If
C{tell()} is present, C{seek(0, 2)} and C{tell()} will be used
to compute the content-length.
@type blocksize: int
@param blocksize: the content is provided in chunks of this size
"""
self.filelike = filelike
self.status = status
self.headers = headers
self.blocksize = blocksize
def _serve_in_chunks(self, stream):
"""internal method yielding data from the given stream"""
while True:
data = stream.read(self.blocksize)
if not data:
break
yield data
if isinstance(self.filelike, basestring):
stream.close()
def __call__(self, environ, start_response):
"""wsgi interface"""
assert isinstance(environ, dict)
if environ["REQUEST_METHOD"].upper() not in ["GET", "HEAD"]:
resp = b"Request method not implemented"
start_response("501 Not Implemented",
[("Content-length", str(len(resp)))])
return [resp]
stream = None
size = -1
try:
if isinstance(self.filelike, basestring):
# raises IOError
stream = open(self.filelike, "rb")
size = os.path.getsize(self.filelike)
else:
stream = self.filelike
if hasattr(stream, "tell"):
stream.seek(0, 2)
size = stream.tell()
stream.seek(0)
except IOError:
resp = b"File not found"
start_response("404 File not found",
[("Content-length", str(len(resp)))])
return [resp]
headers = list(self.headers)
if size >= 0:
if not [v for h, v in headers if h.lower() == "content-length"]:
headers.append(("Content-length", str(size)))
start_response(self.status, headers)
if environ["REQUEST_METHOD"].upper() == "HEAD":
if isinstance(self.filelike, basestring):
stream.close()
return []
if isinstance(self.filelike, basestring) and 'wsgi.file_wrapper' in environ:
return environ['wsgi.file_wrapper'](stream, self.blocksize)
if 0 <= size <= self.blocksize:
data = stream.read(size)
if isinstance(self.filelike, basestring):
stream.close()
return [data]
return self._serve_in_chunks(stream)
|
