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Automatically handle ETag and Last-Modified-Date caching

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This commit is contained in:
Pierre-Olivier Latour
2014-04-09 00:01:12 -07:00
parent 6210564bfc
commit bda3d917ca
1 changed files with 28 additions and 4 deletions
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32
CGDWebServer/GCDWebServerConnection.m
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@@ -392,17 +392,41 @@ static inline NSUInteger _ScanHexNumber(const void* bytes, NSUInteger size) {
CFHTTPMessageSetHeaderFieldValue(_responseMessage, CFSTR("Date"), (ARC_BRIDGE CFStringRef)GCDWebServerFormatHTTPDate([NSDate date]));
}
// http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.26
static inline BOOL _CompareResources(NSString* responseETag, NSString* requestETag, NSDate* responseLastModified, NSDate* requestLastModified) {
if ([requestETag isEqualToString:@"*"] && (!responseLastModified || !requestLastModified || ([responseLastModified compare:requestLastModified] != NSOrderedDescending))) {
return YES;
} else {
if ([responseETag isEqualToString:requestETag]) {
return YES;
}
if (responseLastModified && requestLastModified && ([responseLastModified compare:requestLastModified] != NSOrderedDescending)) {
return YES;
}
}
return NO;
}
// http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html
- (void)_processRequest {
DCHECK(_responseMessage == NULL);
GCDWebServerResponse* response = [self processRequest:_request withBlock:_handler.processBlock];
if (response) {
NSError* error = nil;
if ([response hasBody] && ![response performOpen:&error]) {
LOG_ERROR(@"Failed opening response body for socket %i: %@", _socket, error);
if ((response.statusCode >= 200) && (response.statusCode < 300) && _CompareResources(response.eTag, _request.ifNoneMatch, response.lastModifiedDate, _request.ifModifiedSince)) {
NSInteger code = [_request.method isEqualToString:@"HEAD"] || [_request.method isEqualToString:@"GET"] ? kGCDWebServerHTTPStatusCode_NotModified : kGCDWebServerHTTPStatusCode_PreconditionFailed;
_response = [[GCDWebServerResponse alloc] initWithStatusCode:code];
_response.cacheControlMaxAge = response.cacheControlMaxAge;
_response.lastModifiedDate = response.lastModifiedDate;
_response.eTag = response.eTag;
DCHECK(_response);
} else {
_response = ARC_RETAIN(response);
NSError* error = nil;
if ([response hasBody] && ![response performOpen:&error]) {
LOG_ERROR(@"Failed opening response body for socket %i: %@", _socket, error);
} else {
_response = ARC_RETAIN(response);
}
}
}