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class XAccelMiddleware(object): | |
"""A WSGI Middleware that converts X-Sendfile headers to X-Accel-Redirect | |
headers if possible. | |
If the path is not mapped to a URI usable for X-Sendfile we abort with an | |
error since it likely means there is a misconfiguration. | |
""" | |
def __init__(self, app, mapping): | |
self.app = app | |
self.mapping = mapping.items() | |
def __call__(self, environ, start_response): | |
def _start_response(status, headers, exc_info=None): | |
xsf_path = None | |
new_headers = [] | |
for name, value in headers: | |
if name.lower() == 'x-sendfile': | |
xsf_path = value | |
else: | |
new_headers.append((name, value)) | |
if xsf_path: | |
uri = self.make_x_accel_header(xsf_path) | |
if not uri: | |
raise ValueError('Could not map %s to an URI' % xsf_path) | |
new_headers.append(('X-Accel-Redirect', uri)) | |
return start_response(status, new_headers, exc_info) | |
return self.app(environ, _start_response) | |
def make_x_accel_header(self, path): | |
for base, uri in self.mapping: | |
if path.startswith(base + '/'): | |
return uri + path[len(base):] |
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