webplugindatabase.mm

linux下开源浏览器WebKit的源码,市面上的很多商用浏览器都是移植自WebKit

/*
 * Copyright (C) 2005 Apple Computer, Inc.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1.  Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer. 
 * 2.  Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution. 
 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
 *     its contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission. 
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#import "WebPluginDatabase.h"

#import "WebBaseNetscapePluginView.h"
#import "WebBasePluginPackage.h"
#import "WebDataSourcePrivate.h"
#import "WebFrame.h"
#import "WebFrameViewInternal.h"
#import "WebHTMLRepresentation.h"
#import "WebHTMLView.h"
#import "WebHTMLView.h"
#import "WebKitLogging.h"
#import "WebNSFileManagerExtras.h"
#import "WebNetscapePluginPackage.h"
#import "WebPluginController.h"
#import "WebPluginPackage.h"
#import "WebViewPrivate.h"
#import <WebKitSystemInterface.h>
#import <wtf/Assertions.h>

static void checkCandidate(WebBasePluginPackage **currentPlugin, WebBasePluginPackage **candidatePlugin);

@interface WebPluginDatabase (Internal)
+ (NSArray *)_defaultPlugInPaths;
- (NSArray *)_plugInPaths;
- (void)_addPlugin:(WebBasePluginPackage *)plugin;
- (void)_removePlugin:(WebBasePluginPackage *)plugin;
- (NSMutableSet *)_scanForNewPlugins;
@end

@implementation WebPluginDatabase

static WebPluginDatabase *sharedDatabase = nil;

+ (WebPluginDatabase *)sharedDatabase 
{
    if (!sharedDatabase) {
        sharedDatabase = [[WebPluginDatabase alloc] init];
        [sharedDatabase setPlugInPaths:[self _defaultPlugInPaths]];
        [sharedDatabase refresh];
    }
    
    return sharedDatabase;
}

+ (void)closeSharedDatabase 
{
    [sharedDatabase close];
}

static void checkCandidate(WebBasePluginPackage **currentPlugin, WebBasePluginPackage **candidatePlugin)
{
    if (!*currentPlugin) {
        *currentPlugin = *candidatePlugin;
        return;
    }

    if ([[[*currentPlugin bundle] bundleIdentifier] isEqualToString:[[*candidatePlugin bundle] bundleIdentifier]] && [*candidatePlugin versionNumber] > [*currentPlugin versionNumber]) 
        *currentPlugin = *candidatePlugin;
}

- (WebBasePluginPackage *)pluginForKey:(NSString *)key withEnumeratorSelector:(SEL)enumeratorSelector
{
    WebBasePluginPackage *plugin = nil;
    WebBasePluginPackage *webPlugin = nil;
#ifdef SUPPORT_CFM
    WebBasePluginPackage *CFMPlugin = nil;
#endif
    WebBasePluginPackage *machoPlugin = nil;    

    NSEnumerator *pluginEnumerator = [plugins objectEnumerator];
    key = [key lowercaseString];

    while ((plugin = [pluginEnumerator nextObject]) != nil) {
        if ([[[plugin performSelector:enumeratorSelector] allObjects] containsObject:key]) {
            if ([plugin isKindOfClass:[WebPluginPackage class]]) 
                checkCandidate(&webPlugin, &plugin);
#if ENABLE(NETSCAPE_PLUGIN_API)
            else if([plugin isKindOfClass:[WebNetscapePluginPackage class]]) {
                WebExecutableType executableType = [(WebNetscapePluginPackage *)plugin executableType];
#ifdef SUPPORT_CFM
                if (executableType == WebCFMExecutableType) {
                    checkCandidate(&CFMPlugin, &plugin);
                } else 
#endif // SUPPORT_CFM
                if (executableType == WebMachOExecutableType) {
                    checkCandidate(&machoPlugin, &plugin);
                } else {
                    ASSERT_NOT_REACHED();
                }
            } else {
                ASSERT_NOT_REACHED();
            }
#endif
        }
    }

    // Allow other plug-ins to win over QT because if the user has installed a plug-in that can handle a type
    // that the QT plug-in can handle, they probably intended to override QT.
    if (webPlugin && ![webPlugin isQuickTimePlugIn])
        return webPlugin;
    
    else if (machoPlugin && ![machoPlugin isQuickTimePlugIn])
        return machoPlugin;
#ifdef SUPPORT_CFM
    else if (CFMPlugin && ![CFMPlugin isQuickTimePlugIn])
        return CFMPlugin;
#endif // SUPPORT_CFM
    else if (webPlugin)
        return webPlugin;
    else if (machoPlugin)
        return machoPlugin;
#ifdef SUPPORT_CFM
    else if (CFMPlugin)
        return CFMPlugin;
#endif
    return nil;
}

- (WebBasePluginPackage *)pluginForMIMEType:(NSString *)MIMEType
{
    return [self pluginForKey:[MIMEType lowercaseString]
       withEnumeratorSelector:@selector(MIMETypeEnumerator)];
}

- (WebBasePluginPackage *)pluginForExtension:(NSString *)extension
{
    WebBasePluginPackage *plugin = [self pluginForKey:[extension lowercaseString]
                               withEnumeratorSelector:@selector(extensionEnumerator)];
    if (!plugin) {
        // If no plug-in was found from the extension, attempt to map from the extension to a MIME type
        // and find the a plug-in from the MIME type. This is done in case the plug-in has not fully specified
        // an extension <-> MIME type mapping.
        NSString *MIMEType = WKGetMIMETypeForExtension(extension);
        if ([MIMEType length] > 0)
            plugin = [self pluginForMIMEType:MIMEType];
    }
    return plugin;
}

- (NSArray *)plugins
{
    return [plugins allValues];
}

static NSArray *additionalWebPlugInPaths;

+ (void)setAdditionalWebPlugInPaths:(NSArray *)additionalPaths
{
    if (additionalPaths == additionalWebPlugInPaths)
        return;
    
    [additionalWebPlugInPaths release];
    additionalWebPlugInPaths = [additionalPaths copy];

    // One might be tempted to add additionalWebPlugInPaths to the global WebPluginDatabase here.
    // For backward compatibility with earlier versions of the +setAdditionalWebPlugInPaths: SPI,
    // we need to save a copy of the additional paths and not cause a refresh of the plugin DB
    // at this time.
    // See Radars 4608487 and 4609047.
}

- (void)setPlugInPaths:(NSArray *)newPaths
{
    if (plugInPaths == newPaths)
        return;
        
    [plugInPaths release];
    plugInPaths = [newPaths copy];
}

- (void)close
{
    NSEnumerator *pluginEnumerator = [[self plugins] objectEnumerator];
    WebBasePluginPackage *plugin;
    while ((plugin = [pluginEnumerator nextObject]) != nil)
        [self _removePlugin:plugin];
    [plugins release];
    plugins = nil;
}

- (id)init
{
    if (!(self = [super init]))
        return nil;
        
    registeredMIMETypes = [[NSMutableSet alloc] init];
    pluginInstanceViews = [[NSMutableSet alloc] init];
    
    return self;
}

- (void)dealloc
{
    [plugInPaths release];
    [plugins release];
    [registeredMIMETypes release];
    [pluginInstanceViews release];
    
    [super dealloc];
}