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      1 /*
      2  * Copyright (C) 2005, 2008 Apple Inc. All rights reserved.
      3  * Copyright (C) 2006 Alexey Proskuryakov (ap (at) 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 }
    103