def evaluateHTTPConditionals(lastmodified,
entitytag,
environ,
isnewfile=False):
## Conditions
# An HTTP/1.1 origin server, upon receiving a conditional request that includes both a Last-Modified date
# (e.g., in an If-Modified-Since or If-Unmodified-Since header field) and one or more entity tags (e.g.,
# in an If-Match, If-None-Match, or If-Range header field) as cache validators, MUST NOT return a response
# status of 304 (Not Modified) unless doing so is consistent with all of the conditional header fields in
# the request.
if 'HTTP_IF_MATCH' in environ:
if isnewfile:
raise HTTPRequestException(
processrequesterrorhandler.HTTP_PRECONDITION_FAILED)
else:
ifmatchlist = environ['HTTP_IF_MATCH'].split(",")
for ifmatchtag in ifmatchlist:
ifmatchtag = ifmatchtag.strip(" \"\t")
if ifmatchtag == entitytag or ifmatchtag == '*':
break
raise HTTPRequestException(
processrequesterrorhandler.HTTP_PRECONDITION_FAILED)
# If-None-Match
# If none of the entity tags match, then the server MAY perform the requested method as if the
# If-None-Match header field did not exist, but MUST also ignore any If-Modified-Since header field
# (s) in the request. That is, if no entity tags match, then the server MUST NOT return a 304 (Not Modified)
# response.
ignoreifmodifiedsince = False
if 'HTTP_IF_NONE_MATCH' in environ:
if isnewfile:
ignoreifmodifiedsince = True
else:
ifmatchlist = environ['HTTP_IF_NONE_MATCH'].split(",")
for ifmatchtag in ifmatchlist:
ifmatchtag = ifmatchtag.strip(" \"\t")
if ifmatchtag == entitytag or ifmatchtag == '*':
raise HTTPRequestException(
processrequesterrorhandler.HTTP_PRECONDITION_FAILED)
ignoreifmodifiedsince = True
if not isnewfile and 'HTTP_IF_UNMODIFIED_SINCE' in environ:
ifunmodtime = httpdatehelper.getsecstime(
environ['HTTP_IF_UNMODIFIED_SINCE'])
if ifunmodtime:
if ifunmodtime <= lastmodified:
raise HTTPRequestException(
processrequesterrorhandler.HTTP_PRECONDITION_FAILED)
if not isnewfile and 'HTTP_IF_MODIFIED_SINCE' in environ and not ignoreifmodifiedsince:
ifmodtime = httpdatehelper.getsecstime(
environ['HTTP_IF_MODIFIED_SINCE'])
if ifmodtime:
if ifmodtime > lastmodified:
raise HTTPRequestException(
processrequesterrorhandler.HTTP_NOT_MODIFIED)
def evaluateHTTPConditionals(resourceAL, respath, lastmodified, entitytag, environ, isnewfile=False):
## Conditions
# An HTTP/1.1 origin server, upon receiving a conditional request that includes both a Last-Modified date
# (e.g., in an If-Modified-Since or If-Unmodified-Since header field) and one or more entity tags (e.g.,
# in an If-Match, If-None-Match, or If-Range header field) as cache validators, MUST NOT return a response
# status of 304 (Not Modified) unless doing so is consistent with all of the conditional header fields in
# the request.
if 'HTTP_IF_MATCH' in environ and resourceAL.supportEntityTag(respath):
if isnewfile:
raise HTTPRequestException(processrequesterrorhandler.HTTP_PRECONDITION_FAILED)
else:
ifmatchlist = environ['HTTP_IF_MATCH'].split(",")
for ifmatchtag in ifmatchlist:
ifmatchtag = ifmatchtag.strip(" \"\t")
if ifmatchtag == entitytag or ifmatchtag == '*':
break
raise HTTPRequestException(processrequesterrorhandler.HTTP_PRECONDITION_FAILED)
# If-None-Match
# If none of the entity tags match, then the server MAY perform the requested method as if the
# If-None-Match header field did not exist, but MUST also ignore any If-Modified-Since header field
# (s) in the request. That is, if no entity tags match, then the server MUST NOT return a 304 (Not Modified)
# response.
ignoreifmodifiedsince = False
if 'HTTP_IF_NONE_MATCH' in environ and resourceAL.supportEntityTag(respath):
if isnewfile:
ignoreifmodifiedsince = True
else:
ifmatchlist = environ['HTTP_IF_NONE_MATCH'].split(",")
for ifmatchtag in ifmatchlist:
ifmatchtag = ifmatchtag.strip(" \"\t")
if ifmatchtag == entitytag or ifmatchtag == '*':
# raise HTTPRequestException(processrequesterrorhandler.HTTP_PRECONDITION_FAILED)
# XXX(bhy) There was HTTP_PRECONDITION_FAILED, but should there be a HTTP_NOT_MODIFIED raised?
# Otherwise the browser get confused in the case it has a valid cache for the response.
raise HTTPRequestException(processrequesterrorhandler.HTTP_NOT_MODIFIED)
ignoreifmodifiedsince = True
if not isnewfile and 'HTTP_IF_UNMODIFIED_SINCE' in environ and resourceAL.supportLastModified(respath):
ifunmodtime = httpdatehelper.getsecstime(environ['HTTP_IF_UNMODIFIED_SINCE'])
if ifunmodtime:
if ifunmodtime <= lastmodified:
raise HTTPRequestException(processrequesterrorhandler.HTTP_PRECONDITION_FAILED)
if not isnewfile and 'HTTP_IF_MODIFIED_SINCE' in environ and not ignoreifmodifiedsince and resourceAL.supportLastModified(respath):
ifmodtime = httpdatehelper.getsecstime(environ['HTTP_IF_MODIFIED_SINCE'])
if ifmodtime:
if ifmodtime > lastmodified:
raise HTTPRequestException(processrequesterrorhandler.HTTP_NOT_MODIFIED)
def evaluateHTTPConditionalsWithoutExceptions(lastmodified, entitytag, environ, isnewfile=False):
## Conditions
# An HTTP/1.1 origin server, upon receiving a conditional request that includes both a Last-Modified date
# (e.g., in an If-Modified-Since or If-Unmodified-Since header field) and one or more entity tags (e.g.,
# in an If-Match, If-None-Match, or If-Range header field) as cache validators, MUST NOT return a response
# status of 304 (Not Modified) unless doing so is consistent with all of the conditional header fields in
# the request.
if 'HTTP_IF_MATCH' in environ:
if isnewfile:
return '412 Precondition Failed'
else:
ifmatchlist = environ['HTTP_IF_MATCH'].split(",")
for ifmatchtag in ifmatchlist:
ifmatchtag = ifmatchtag.strip(" \"\t")
if ifmatchtag == entitytag or ifmatchtag == '*':
break
return '412 Precondition Failed'
# If-None-Match
# If none of the entity tags match, then the server MAY perform the requested method as if the
# If-None-Match header field did not exist, but MUST also ignore any If-Modified-Since header field
# (s) in the request. That is, if no entity tags match, then the server MUST NOT return a 304 (Not Modified)
# response.
ignoreifmodifiedsince = False
if 'HTTP_IF_NONE_MATCH' in environ:
if isnewfile:
ignoreifmodifiedsince = True
else:
ifmatchlist = environ['HTTP_IF_NONE_MATCH'].split(",")
for ifmatchtag in ifmatchlist:
ifmatchtag = ifmatchtag.strip(" \"\t")
if ifmatchtag == entitytag or ifmatchtag == '*':
return '412 Precondition Failed'
ignoreifmodifiedsince = True
if not isnewfile and 'HTTP_IF_UNMODIFIED_SINCE' in environ:
ifunmodtime = httpdatehelper.getsecstime(environ['HTTP_IF_UNMODIFIED_SINCE'])
if ifunmodtime:
if ifunmodtime <= lastmodified:
return '412 Precondition Failed'
if not isnewfile and 'HTTP_IF_MODIFIED_SINCE' in environ and not ignoreifmodifiedsince:
ifmodtime = httpdatehelper.getsecstime(environ['HTTP_IF_MODIFIED_SINCE'])
if ifmodtime:
if ifmodtime > lastmodified:
return '304 Not Modified'
return '200 OK'
