Source/WebCore/platform/network/ios/WebCoreURLResponseIOS.mm

/*
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 *     notice, this list of conditions and the following disclaimer. 
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 *     its contributors may be used to endorse or promote products derived
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 *
 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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#import "config.h"
#import "WebCoreURLResponseIOS.h"

#if PLATFORM(IOS_FAMILY)

#import "QuickLook.h"
#import <MobileCoreServices/MobileCoreServices.h>

#import <pal/ios/QuickLookSoftLink.h>

namespace WebCore {

void adjustMIMETypeIfNecessary(CFURLResponseRef response, bool isMainResourceLoad)
{
    auto type = CFURLResponseGetMIMEType(response);
    if (!type) {
        // FIXME: <rdar://problem/46332893> is fixed, but for some reason, this special case is still needed; should resolve that issue and remove this.
        if (auto extension = filePathExtension(response)) {
            if (CFStringCompare(extension.get(), CFSTR("mjs"), kCFCompareCaseInsensitive) == kCFCompareEqualTo) {
                CFURLResponseSetMIMEType(response, CFSTR("text/javascript"));
                return;
            }
        }
        CFURLResponseSetMIMEType(response, CFSTR("application/octet-stream"));
        return;
    }

#if !USE(QUICK_LOOK)
    UNUSED_PARAM(isMainResourceLoad);
#else
    // Ensure that the MIME type is correct so that QuickLook's web plug-in is called when needed.
    // The shouldUseQuickLookForMIMEType function filters out the common MIME types so we don't do unnecessary work in those cases.
    if (isMainResourceLoad && shouldUseQuickLookForMIMEType((__bridge NSString *)type)) {
        RetainPtr<CFStringRef> updatedType;
        auto suggestedFilename = adoptCF(CFURLResponseCopySuggestedFilename(response));
        if (auto quickLookType = adoptNS(PAL::softLink_QuickLook_QLTypeCopyBestMimeTypeForFileNameAndMimeType((__bridge NSString *)suggestedFilename.get(), (__bridge NSString *)type)))
            updatedType = (__bridge CFStringRef)quickLookType.get();
        else if (auto extension = filePathExtension(response))
            updatedType = preferredMIMETypeForFileExtensionFromUTType(extension.get());
        if (updatedType && (!type || CFStringCompare(type, updatedType.get(), kCFCompareCaseInsensitive) != kCFCompareEqualTo))
            CFURLResponseSetMIMEType(response, updatedType.get());
    }
#endif // USE(QUICK_LOOK)
}

} // namespace WebCore

#endif // PLATFORM(IOS_FAMILY)