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951aed561a
Add a new function, flatpak_cache_http_uri() that when passed an URL and a local destination location, either a) downloads the content and stores it at the destination location, storing HTTP cache header information like Last-Modified, Etag into user xattrs (if available) or a separate file or b) if the downloaded content is already present, checks the header information to decide whether the downloaded content can be used or needs to be revalidated witha conditional request. Tests are added that use a special case test server that adds HTTP caching headers and reacts to them based on query parameters. A small test binary 'httpcache' is added for the tests to use. Closes: #1910 Approved by: alexlarsson
72 lines
2.1 KiB
Python
72 lines
2.1 KiB
Python
#!/usr/bin/python2
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from wsgiref.handlers import format_date_time
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from email.utils import parsedate
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from calendar import timegm
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from urlparse import parse_qs
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import BaseHTTPServer
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import time
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server_start_time = int(time.time())
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def parse_http_date(date):
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parsed = parsedate(date)
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if parsed is not None:
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return timegm(parsed)
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else:
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return None
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class RequestHandler(BaseHTTPServer.BaseHTTPRequestHandler):
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def do_GET(self):
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parts = self.path.split('?', 1)
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path = parts[0]
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if len(parts) == 1:
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query = {}
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else:
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query = parse_qs(parts[1], keep_blank_values=True)
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response = 200
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add_headers = {}
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if 'modified-time' in query:
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modified_since = self.headers.get("If-Modified-Since")
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if modified_since:
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modified_since_time = parse_http_date(modified_since)
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if modified_since_time <= server_start_time:
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response = 304
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add_headers["Last-Modified"] = format_date_time(server_start_time)
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if 'etag' in query:
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etag = str(server_start_time)
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if self.headers.get("If-None-Match") == etag:
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response = 304
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add_headers['Etag'] = etag
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self.send_response(response)
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for k, v in add_headers.items():
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self.send_header(k, v)
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if 'max-age' in query:
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self.send_header('Cache-Control', 'max-age=' + query['max-age'][0])
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if 'no-cache' in query:
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self.send_header('Cache-Control', 'no-cache')
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if 'expires-past' in query:
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self.send_header('Expires', format_date_time(server_start_time - 3600))
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if 'expires-future' in query:
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self.send_header('Expires', format_date_time(server_start_time + 3600))
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if response == 200:
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self.send_header("Content-Type", "text/plain; charset=UTF-8")
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self.end_headers()
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if response == 200:
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self.wfile.write("path=" + self.path + "\n");
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def test():
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BaseHTTPServer.test(RequestHandler)
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if __name__ == '__main__':
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test()
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