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Merge pull request #135 from kgoodier/develop-future
Groundwork for future push work
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,26 @@ | ||
| // | ||
| // SPDYCacheStoragePolicy.h | ||
| // SPDY | ||
| // | ||
| // Copyright (c) 2014 Twitter, Inc. All rights reserved. | ||
| // Licensed under the Apache License v2.0 | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Derived from code in Apple, Inc.'s CustomHTTPProtocol sample | ||
| // project, found as of this notice at | ||
| // https://developer.apple.com/LIBRARY/IOS/samplecode/CustomHTTPProtocol | ||
| // | ||
|
|
||
| #include <Foundation/Foundation.h> | ||
|
|
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| /*! Determines the cache storage policy for a response. | ||
| * \details When we provide a response up to the client we need to tell the client whether | ||
| * the response is cacheable or not. The default HTTP/HTTPS protocol has a reasonable | ||
| * complex chunk of code to determine this, but we can't get at it. Thus, we have to | ||
| * reimplement it ourselves. This is split off into a separate file to emphasise that | ||
| * this is standard boilerplate that you probably don't need to look at. | ||
| * \param request The request that generated the response; must not be nil. | ||
| * \param response The response itself; must not be nil. | ||
| * \returns A cache storage policy to use. | ||
| */ | ||
| extern NSURLCacheStoragePolicy SPDYCacheStoragePolicy(NSURLRequest *request, NSHTTPURLResponse *response); |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,85 @@ | ||
| // | ||
| // SPDYCacheStoragePolicy.m | ||
| // SPDY | ||
| // | ||
| // Copyright (c) 2014 Twitter, Inc. All rights reserved. | ||
| // Licensed under the Apache License v2.0 | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Derived from code in Apple, Inc.'s CustomHTTPProtocol sample | ||
| // project, found as of this notice at | ||
| // https://developer.apple.com/LIBRARY/IOS/samplecode/CustomHTTPProtocol | ||
| // | ||
|
|
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| #import "SPDYCacheStoragePolicy.h" | ||
|
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| extern NSURLCacheStoragePolicy SPDYCacheStoragePolicy(NSURLRequest *request, NSHTTPURLResponse *response) | ||
| { | ||
| bool cacheable; | ||
| NSURLCacheStoragePolicy result; | ||
|
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| // First determine if the request is cacheable based on its status code. | ||
|
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| switch (response.statusCode) { | ||
| case 200: | ||
| case 203: | ||
| case 206: | ||
| case 301: | ||
| case 304: | ||
| case 404: | ||
| case 410: | ||
| cacheable = YES; | ||
| break; | ||
| default: | ||
| cacheable = NO; | ||
| break; | ||
| } | ||
|
|
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| // If the response might be cacheable, look at the "Cache-Control" header in | ||
| // the response. | ||
|
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| // IMPORTANT: We can't rely on -rangeOfString: returning valid results if the target | ||
| // string is nil, so we have to explicitly test for nil in the following two cases. | ||
|
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| if (cacheable) { | ||
| NSString *responseHeader; | ||
|
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| for (NSString *key in [response.allHeaderFields allKeys]) { | ||
| if ([key caseInsensitiveCompare:@"cache-control"] == NSOrderedSame) { | ||
| responseHeader = [response.allHeaderFields[key] lowercaseString]; | ||
| break; | ||
| } | ||
| } | ||
|
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| if (responseHeader != nil && [responseHeader rangeOfString:@"no-store"].location != NSNotFound) { | ||
| cacheable = NO; | ||
| } | ||
| } | ||
|
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| // If we still think it might be cacheable, look at the "Cache-Control" header in | ||
| // the request. | ||
|
|
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| if (cacheable) { | ||
| NSString *requestHeader; | ||
|
|
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| requestHeader = [[request valueForHTTPHeaderField:@"cache-control"] lowercaseString]; | ||
| if (requestHeader != nil && | ||
| [requestHeader rangeOfString:@"no-store"].location != NSNotFound && | ||
| [requestHeader rangeOfString:@"no-cache"].location != NSNotFound) { | ||
| cacheable = NO; | ||
| } | ||
| } | ||
|
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| // Use the cacheable flag to determine the result. | ||
|
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| if (cacheable) { | ||
| // Modern versions of iOS use file protection to protect the cache, and thus are | ||
| // happy to cache HTTPS on disk. Previous code here returned | ||
| // NSURLCacheStorageAllowedInMemoryOnly for https. | ||
| result = NSURLCacheStorageAllowed; | ||
| } else { | ||
| result = NSURLCacheStorageNotAllowed; | ||
| } | ||
|
|
||
| return result; | ||
| } |
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