1 /*

     2  * Copyright (C) 2005, 2008 Apple Inc. All rights reserved.

     3  * Copyright (C) 2006 Alexey Proskuryakov (ap@nypop.com)

     4  *

     5  * Redistribution and use in source and binary forms, with or without

     6  * modification, are permitted provided that the following conditions

     7  * are met:

     8  *

     9  * 1.  Redistributions of source code must retain the above copyright

    10  *     notice, this list of conditions and the following disclaimer. 

    11  * 2.  Redistributions in binary form must reproduce the above copyright

    12  *     notice, this list of conditions and the following disclaimer in the

    13  *     documentation and/or other materials provided with the distribution. 

    14  * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of

    15  *     its contributors may be used to endorse or promote products derived

    16  *     from this software without specific prior written permission. 

    17  *

    18  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY

    19  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

    20  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

    21  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY

    22  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

    23  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;

    24  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND

    25  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

    26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

    27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

    28  */

    29 

    30 #import "config.h"

    31 #import "LoaderNSURLExtras.h"

    32 

    33 #import <wtf/Assertions.h>

    34 #import <wtf/Vector.h>

    35 #import "KURL.h"

    36 #import "LocalizedStrings.h"

    37 #import "MIMETypeRegistry.h"

    38 #import "PlatformString.h"

    39 #import "WebCoreNSStringExtras.h"

    40 

    41 using namespace WebCore;

    42 

    43 static bool vectorContainsString(const Vector<String>& vector, const String& string)

    44 {

    45     int size = vector.size();

    46     for (int i = 0; i < size; i++)

    47         if (vector[i] == string)

    48             return true;

    49     return false;

    50 }

    51 

    52 NSString *suggestedFilenameWithMIMEType(NSURL *url, NSString *MIMEType)

    53 {

    54     // Get the filename from the URL. Try the lastPathComponent first.

    55     NSString *lastPathComponent = [[url path] lastPathComponent];

    56     NSString *filename = filenameByFixingIllegalCharacters(lastPathComponent);

    57     NSString *extension = nil;

    58 

    59     if ([filename length] == 0 || [lastPathComponent isEqualToString:@"/"]) {

    60         // lastPathComponent is no good, try the host.

    61         NSString *host = KURL(url).host();

    62         filename = filenameByFixingIllegalCharacters(host);

    63         if ([filename length] == 0) {

    64             // Can't make a filename using this URL, use "unknown".

    65             filename = copyImageUnknownFileLabel();

    66         }

    67     } else {

    68         // Save the extension for later correction. Only correct the extension of the lastPathComponent.

    69         // For example, if the filename ends up being the host, we wouldn't want to correct ".com" in "www.apple.com".

    70         extension = [filename pathExtension];

    71     }

    72 

    73     // No mime type reported. Just return the filename we have now.

    74     if (!MIMEType) {

    75         return filename;

    76     }

    77 

    78     // Do not correct filenames that are reported with a mime type of tar, and 

    79     // have a filename which has .tar in it or ends in .tgz

    80     if (([MIMEType isEqualToString:@"application/tar"] || [MIMEType isEqualToString:@"application/x-tar"]) 

    81         && (hasCaseInsensitiveSubstring(filename, @".tar")

    82         || hasCaseInsensitiveSuffix(filename, @".tgz"))) {

    83         return filename;

    84     }

    85 

    86     // I don't think we need to worry about this for the image case

    87     // If the type is known, check the extension and correct it if necessary.

    88     if (![MIMEType isEqualToString:@"application/octet-stream"] && ![MIMEType isEqualToString:@"text/plain"]) {

    89         Vector<String> extensions = MIMETypeRegistry::getExtensionsForMIMEType(MIMEType);

    90 

    91         if (extensions.isEmpty() || !vectorContainsString(extensions, extension)) {

    92             // The extension doesn't match the MIME type. Correct this.

    93             NSString *correctExtension = MIMETypeRegistry::getPreferredExtensionForMIMEType(MIMEType);

    94             if ([correctExtension length] != 0) {

    95                 // Append the correct extension.

    96                 filename = [filename stringByAppendingPathExtension:correctExtension];

    97             }

    98         }

    99     }

   100 

   101     return filename;

   102 }