The Tor Browser: uriloader/exthandler/mac/nsOSHelperAppService.mm@6474c204b198 (annotated)

uriloader/exthandler/mac/nsOSHelperAppService.mm@6474c204b198 (annotated)

uriloader/exthandler/mac/nsOSHelperAppService.mm

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /* -*- Mode: C++; tab-width: 3; indent-tabs-mode: nil; c-basic-offset: 2 -*-
  *
  * This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 #include <sys/types.h>
 #include <sys/stat.h>
 #include "nsOSHelperAppService.h"
 #include "nsObjCExceptions.h"
 #include "nsISupports.h"
 #include "nsString.h"
 #include "nsTArray.h"
 #include "nsXPIDLString.h"
 #include "nsIURL.h"
 #include "nsIFile.h"
 #include "nsILocalFileMac.h"
 #include "nsMimeTypes.h"
 #include "nsIStringBundle.h"
 #include "nsIPromptService.h"
 #include "nsMemory.h"
 #include "nsCRT.h"
 #include "nsMIMEInfoMac.h"
 #include "nsEmbedCID.h"
 #import <CoreFoundation/CoreFoundation.h>
 #import <ApplicationServices/ApplicationServices.h>
 // chrome URL's
 #define HELPERAPPLAUNCHER_BUNDLE_URL "chrome://global/locale/helperAppLauncher.properties"
 #define BRAND_BUNDLE_URL "chrome://branding/locale/brand.properties"
 /* This is an undocumented interface (in the Foundation framework) that has
  * been stable since at least 10.2.8 and is still present on SnowLeopard.
  * Furthermore WebKit has three public methods (in WebKitSystemInterface.h)
  * that are thin wrappers around this interface's last three methods.  So
  * it's unlikely to change anytime soon.  Now that we're no longer using
  * Internet Config Services, this is the only way to look up a MIME type
  * from an extension, or vice versa.
  */
 @class NSURLFileTypeMappingsInternal;
 @interface NSURLFileTypeMappings : NSObject
 {
     NSURLFileTypeMappingsInternal *_internal;
 }
 + (NSURLFileTypeMappings*)sharedMappings;
 - (NSString*)MIMETypeForExtension:(NSString*)aString;
 - (NSString*)preferredExtensionForMIMEType:(NSString*)aString;
 - (NSArray*)extensionsForMIMEType:(NSString*)aString;
 @end
 nsOSHelperAppService::nsOSHelperAppService() : nsExternalHelperAppService()
 {
   mode_t mask = umask(0777);
   umask(mask);
   mPermissions = 0666 & ~mask;
 }
 nsOSHelperAppService::~nsOSHelperAppService()
 {}
 nsresult nsOSHelperAppService::OSProtocolHandlerExists(const char * aProtocolScheme, bool * aHandlerExists)
 {
   // CFStringCreateWithBytes() can fail even if we're not out of memory --
   // for example if the 'bytes' parameter is something very wierd (like "��~"
   // aka "\xFF\xFF~"), or possibly if it can't be interpreted as using what's
   // specified in the 'encoding' parameter.  See bug 548719.
   CFStringRef schemeString = ::CFStringCreateWithBytes(kCFAllocatorDefault,
                                                        (const UInt8*)aProtocolScheme,
                                                        strlen(aProtocolScheme),
                                                        kCFStringEncodingUTF8,
                                                        false);
   if (schemeString) {
     // LSCopyDefaultHandlerForURLScheme() can fail to find the default handler
     // for aProtocolScheme when it's never been explicitly set (using
     // LSSetDefaultHandlerForURLScheme()).  For example, Safari is the default
     // handler for the "http" scheme on a newly installed copy of OS X.  But
     // this (presumably) wasn't done using LSSetDefaultHandlerForURLScheme(),
     // so LSCopyDefaultHandlerForURLScheme() will fail to find Safari.  To get
     // around this we use LSCopyAllHandlersForURLScheme() instead -- which seems
     // never to fail.
     // http://lists.apple.com/archives/Carbon-dev/2007/May/msg00349.html
     // http://www.realsoftware.com/listarchives/realbasic-nug/2008-02/msg00119.html
     CFArrayRef handlerArray = ::LSCopyAllHandlersForURLScheme(schemeString);
     *aHandlerExists = !!handlerArray;
     if (handlerArray)
       ::CFRelease(handlerArray);
     ::CFRelease(schemeString);
   } else {
     *aHandlerExists = false;
   }
   return NS_OK;
 }
 NS_IMETHODIMP nsOSHelperAppService::GetApplicationDescription(const nsACString& aScheme, nsAString& _retval)
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NSRESULT;
   nsresult rv = NS_ERROR_NOT_AVAILABLE;
   CFStringRef schemeCFString =
     ::CFStringCreateWithBytes(kCFAllocatorDefault,
                               (const UInt8 *)PromiseFlatCString(aScheme).get(),
                               aScheme.Length(),
                               kCFStringEncodingUTF8,
                               false);
   if (schemeCFString) {
     CFStringRef lookupCFString = ::CFStringCreateWithFormat(NULL, NULL, CFSTR("%@:"), schemeCFString);
     if (lookupCFString) {
       CFURLRef lookupCFURL = ::CFURLCreateWithString(NULL, lookupCFString, NULL);
       if (lookupCFURL) {
         CFURLRef appCFURL = NULL;
         OSStatus theErr = ::LSGetApplicationForURL(lookupCFURL, kLSRolesAll, NULL, &appCFURL);
         if (theErr == noErr) {
           CFBundleRef handlerBundle = ::CFBundleCreate(NULL, appCFURL);
           if (handlerBundle) {
             // Get the human-readable name of the default handler bundle
             CFStringRef bundleName =
             (CFStringRef)::CFBundleGetValueForInfoDictionaryKey(handlerBundle,
                                                                 kCFBundleNameKey);
             if (bundleName) {
               nsAutoTArray<UniChar, 255> buffer;
               CFIndex bundleNameLength = ::CFStringGetLength(bundleName);
               buffer.SetLength(bundleNameLength);
               ::CFStringGetCharacters(bundleName, CFRangeMake(0, bundleNameLength),
                                       buffer.Elements());
               _retval.Assign(reinterpret_cast<char16_t*>(buffer.Elements()), bundleNameLength);
               rv = NS_OK;
             }
             ::CFRelease(handlerBundle);
           }
           ::CFRelease(appCFURL);
         }
         ::CFRelease(lookupCFURL);
       }
       ::CFRelease(lookupCFString);
     }
     ::CFRelease(schemeCFString);
   }
   return rv;
   NS_OBJC_END_TRY_ABORT_BLOCK_NSRESULT;
 }
 nsresult nsOSHelperAppService::GetFileTokenForPath(const char16_t * aPlatformAppPath, nsIFile ** aFile)
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NSRESULT;
   nsresult rv;
   nsCOMPtr<nsILocalFileMac> localFile (do_CreateInstance(NS_LOCAL_FILE_CONTRACTID, &rv));
   NS_ENSURE_SUCCESS(rv,rv);
   CFURLRef pathAsCFURL;
   CFStringRef pathAsCFString = ::CFStringCreateWithCharacters(NULL,
                                                               reinterpret_cast<const UniChar*>(aPlatformAppPath),
                                                               NS_strlen(aPlatformAppPath));
   if (!pathAsCFString)
     return NS_ERROR_OUT_OF_MEMORY;
   if (::CFStringGetCharacterAtIndex(pathAsCFString, 0) == '/') {
     // we have a Posix path
     pathAsCFURL = ::CFURLCreateWithFileSystemPath(nullptr, pathAsCFString,
                                                   kCFURLPOSIXPathStyle, false);
     if (!pathAsCFURL) {
       ::CFRelease(pathAsCFString);
       return NS_ERROR_OUT_OF_MEMORY;
     }
   }
   else {
     // if it doesn't start with a / it's not an absolute Posix path
     // let's check if it's a HFS path left over from old preferences
     // If it starts with a ':' char, it's not an absolute HFS path
     // so bail for that, and also if it's empty
     if (::CFStringGetLength(pathAsCFString) == 0 ||
         ::CFStringGetCharacterAtIndex(pathAsCFString, 0) == ':')
     {
       ::CFRelease(pathAsCFString);
       return NS_ERROR_FILE_UNRECOGNIZED_PATH;
     }
     pathAsCFURL = ::CFURLCreateWithFileSystemPath(nullptr, pathAsCFString,
                                                   kCFURLHFSPathStyle, false);
     if (!pathAsCFURL) {
       ::CFRelease(pathAsCFString);
       return NS_ERROR_OUT_OF_MEMORY;
     }
   }
   rv = localFile->InitWithCFURL(pathAsCFURL);
   ::CFRelease(pathAsCFString);
   ::CFRelease(pathAsCFURL);
   if (NS_FAILED(rv))
     return rv;
   *aFile = localFile;
   NS_IF_ADDREF(*aFile);
   return NS_OK;
   NS_OBJC_END_TRY_ABORT_BLOCK_NSRESULT;
 }
 NS_IMETHODIMP nsOSHelperAppService::GetFromTypeAndExtension(const nsACString& aType, const nsACString& aFileExt, nsIMIMEInfo ** aMIMEInfo)
 {
   return nsExternalHelperAppService::GetFromTypeAndExtension(aType, aFileExt, aMIMEInfo);
 }
 // Returns the MIME types an application bundle explicitly claims to handle.
 // Returns NULL if aAppRef doesn't explicitly claim to handle any MIME types.
 // If the return value is non-NULL, the caller is responsible for freeing it.
 // This isn't necessarily the same as the MIME types the application bundle
 // is registered to handle in the Launch Services database.  (For example
 // the Preview application is normally registered to handle the application/pdf
 // MIME type, even though it doesn't explicitly claim to handle *any* MIME
 // types in its Info.plist.  This is probably because Preview does explicitly
 // claim to handle the com.adobe.pdf UTI, and Launch Services somehow
 // translates this into a claim to support the application/pdf MIME type.
 // Launch Services doesn't provide any APIs (documented or undocumented) to
 // query which MIME types a given application is registered to handle.  So any
 // app that wants this information (e.g. the Default Apps pref pane) needs to
 // iterate through the entire Launch Services database -- a process which can
 // take several seconds.)
 static CFArrayRef GetMIMETypesHandledByApp(FSRef *aAppRef)
 {
   CFURLRef appURL = ::CFURLCreateFromFSRef(kCFAllocatorDefault, aAppRef);
   if (!appURL) {
     return NULL;
   }
   CFDictionaryRef infoDict = ::CFBundleCopyInfoDictionaryForURL(appURL);
   ::CFRelease(appURL);
   if (!infoDict) {
     return NULL;
   }
   CFTypeRef cfObject = ::CFDictionaryGetValue(infoDict, CFSTR("CFBundleDocumentTypes"));
   if (!cfObject || (::CFGetTypeID(cfObject) != ::CFArrayGetTypeID())) {
     ::CFRelease(infoDict);
     return NULL;
   }
   CFArrayRef docTypes = static_cast<CFArrayRef>(cfObject);
   CFIndex docTypesCount = ::CFArrayGetCount(docTypes);
   if (docTypesCount == 0) {
     ::CFRelease(infoDict);
     return NULL;
   }
   CFMutableArrayRef mimeTypes =
     ::CFArrayCreateMutable(kCFAllocatorDefault, 0, &kCFTypeArrayCallBacks);
   for (CFIndex i = 0; i < docTypesCount; ++i) {
     cfObject = ::CFArrayGetValueAtIndex(docTypes, i);
     if (!cfObject || (::CFGetTypeID(cfObject) != ::CFDictionaryGetTypeID())) {
       continue;
     }
     CFDictionaryRef typeDict = static_cast<CFDictionaryRef>(cfObject);
     // When this key is present (on OS X 10.5 and later), its contents
     // take precedence over CFBundleTypeMIMETypes (and CFBundleTypeExtensions
     // and CFBundleTypeOSTypes).
     cfObject = ::CFDictionaryGetValue(typeDict, CFSTR("LSItemContentTypes"));
     if (cfObject && (::CFGetTypeID(cfObject) == ::CFArrayGetTypeID())) {
       continue;
     }
     cfObject = ::CFDictionaryGetValue(typeDict, CFSTR("CFBundleTypeMIMETypes"));
     if (!cfObject || (::CFGetTypeID(cfObject) != ::CFArrayGetTypeID())) {
       continue;
     }
     CFArrayRef mimeTypeHolder = static_cast<CFArrayRef>(cfObject);
     CFArrayAppendArray(mimeTypes, mimeTypeHolder,
                        ::CFRangeMake(0, ::CFArrayGetCount(mimeTypeHolder)));
   }
   ::CFRelease(infoDict);
   if (!::CFArrayGetCount(mimeTypes)) {
     ::CFRelease(mimeTypes);
     mimeTypes = NULL;
   }
   return mimeTypes;
 }
 // aMIMEType and aFileExt might not match,  If they don't we set *aFound to
 // false and return a minimal nsIMIMEInfo structure.
 already_AddRefed<nsIMIMEInfo>
 nsOSHelperAppService::GetMIMEInfoFromOS(const nsACString& aMIMEType,
                                         const nsACString& aFileExt,
                                         bool * aFound)
 {
   NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NSNULL;
   *aFound = false;
   const nsCString& flatType = PromiseFlatCString(aMIMEType);
   const nsCString& flatExt = PromiseFlatCString(aFileExt);
   PR_LOG(mLog, PR_LOG_DEBUG, ("Mac: HelperAppService lookup for type '%s' ext '%s'\n",
                               flatType.get(), flatExt.get()));
   // Create a Mac-specific MIME info so we can use Mac-specific members.
   nsRefPtr<nsMIMEInfoMac> mimeInfoMac = new nsMIMEInfoMac(aMIMEType);
   NSAutoreleasePool *localPool = [[NSAutoreleasePool alloc] init];
   OSStatus err;
   bool haveAppForType = false;
   bool haveAppForExt = false;
   bool typeAppIsDefault = false;
   bool extAppIsDefault = false;
   FSRef typeAppFSRef;
   FSRef extAppFSRef;
   CFStringRef cfMIMEType = NULL;
   if (!aMIMEType.IsEmpty()) {
     CFURLRef appURL = NULL;
     // CFStringCreateWithCString() can fail even if we're not out of memory --
     // for example if the 'cStr' parameter is something very wierd (like "��~"
     // aka "\xFF\xFF~"), or possibly if it can't be interpreted as using what's
     // specified in the 'encoding' parameter.  See bug 548719.
     cfMIMEType = ::CFStringCreateWithCString(NULL, flatType.get(),
                                              kCFStringEncodingUTF8);
     if (cfMIMEType) {
       err = ::LSCopyApplicationForMIMEType(cfMIMEType, kLSRolesAll, &appURL);
       if ((err == noErr) && appURL && ::CFURLGetFSRef(appURL, &typeAppFSRef)) {
         haveAppForType = true;
         PR_LOG(mLog, PR_LOG_DEBUG, ("LSCopyApplicationForMIMEType found a default application\n"));
       }
       if (appURL) {
         ::CFRelease(appURL);
       }
     }
   }
   if (!aFileExt.IsEmpty()) {
     // CFStringCreateWithCString() can fail even if we're not out of memory --
     // for example if the 'cStr' parameter is something very wierd (like "��~"
     // aka "\xFF\xFF~"), or possibly if it can't be interpreted as using what's
     // specified in the 'encoding' parameter.  See bug 548719.
     CFStringRef cfExt = ::CFStringCreateWithCString(NULL, flatExt.get(), kCFStringEncodingUTF8);
     if (cfExt) {
       err = ::LSGetApplicationForInfo(kLSUnknownType, kLSUnknownCreator, cfExt,
                                       kLSRolesAll, &extAppFSRef, nullptr);
       if (err == noErr) {
         haveAppForExt = true;
         PR_LOG(mLog, PR_LOG_DEBUG, ("LSGetApplicationForInfo found a default application\n"));
       }
       ::CFRelease(cfExt);
     }
   }
   if (haveAppForType && haveAppForExt) {
     // Do aMIMEType and aFileExt match?
     if (::FSCompareFSRefs((const FSRef *) &typeAppFSRef, (const FSRef *) &extAppFSRef) == noErr) {
       typeAppIsDefault = true;
       *aFound = true;
     }
   } else if (haveAppForType) {
     // If aFileExt isn't empty, it doesn't match aMIMEType.
     if (aFileExt.IsEmpty()) {
       typeAppIsDefault = true;
       *aFound = true;
     }
   } else if (haveAppForExt) {
     // If aMIMEType isn't empty, it doesn't match aFileExt, which should mean
     // that we haven't found a matching app.  But make an exception for an app
     // that also explicitly claims to handle aMIMEType, or which doesn't claim
     // to handle any MIME types.  This helps work around the following Apple
     // design flaw:
     //
     // Launch Services is somewhat unreliable about registering Apple apps to
     // handle MIME types.  Probably this is because Apple has officially
     // deprecated support for MIME types (in favor of UTIs).  As a result,
     // most of Apple's own apps don't explicitly claim to handle any MIME
     // types (instead they claim to handle one or more UTIs).  So Launch
     // Services must contain logic to translate support for a given UTI into
     // support for one or more MIME types, and it doesn't always do this
     // correctly.  For example DiskImageMounter isn't (by default) registered
     // to handle the application/x-apple-diskimage MIME type.  See bug 675356.
     //
     // Apple has also deprecated support for file extensions, and Apple apps
     // also don't register to handle them.  But for some reason Launch Services
     // is (apparently) better about translating support for a given UTI into
     // support for one or more file extensions.  It's not at all clear why.
     if (aMIMEType.IsEmpty()) {
       extAppIsDefault = true;
       *aFound = true;
     } else {
       CFArrayRef extAppMIMETypes = GetMIMETypesHandledByApp(&extAppFSRef);
       if (extAppMIMETypes) {
         if (cfMIMEType) {
           if (::CFArrayContainsValue(extAppMIMETypes,
                                      ::CFRangeMake(0, ::CFArrayGetCount(extAppMIMETypes)),
                                      cfMIMEType)) {
             extAppIsDefault = true;
             *aFound = true;
           }
         }
         ::CFRelease(extAppMIMETypes);
       } else {
         extAppIsDefault = true;
         *aFound = true;
       }
     }
   }
   if (cfMIMEType) {
     ::CFRelease(cfMIMEType);
   }
   if (aMIMEType.IsEmpty()) {
     if (haveAppForExt) {
       // If aMIMEType is empty and we've found a default app for aFileExt, try
       // to get the MIME type from aFileExt.  (It might also be worth doing
       // this when aMIMEType isn't empty but haveAppForType is false -- but
       // the doc for this method says that if we have a MIME type (in
       // aMIMEType), we need to give it preference.)
       NSURLFileTypeMappings *map = [NSURLFileTypeMappings sharedMappings];
       NSString *extStr = [NSString stringWithCString:flatExt.get() encoding:NSASCIIStringEncoding];
       NSString *typeStr = map ? [map MIMETypeForExtension:extStr] : NULL;
       if (typeStr) {
         nsAutoCString mimeType;
         mimeType.Assign((char *)[typeStr cStringUsingEncoding:NSASCIIStringEncoding]);
         mimeInfoMac->SetMIMEType(mimeType);
         haveAppForType = true;
       } else {
         // Sometimes the OS won't give us a MIME type for an extension that's
         // registered with Launch Services and has a default app:  For example
         // Real Player registers itself for the "ogg" extension and for the
         // audio/x-ogg and application/x-ogg MIME types, but
         // MIMETypeForExtension returns nil for the "ogg" extension even on
         // systems where Real Player is installed.  This is probably an Apple
         // bug.  But bad things happen if we return an nsIMIMEInfo structure
         // with an empty MIME type and set *aFound to true.  So in this
         // case we need to set it to false here.
         haveAppForExt = false;
         extAppIsDefault = false;
         *aFound = false;
       }
     } else {
       // Otherwise set the MIME type to a reasonable fallback.
       mimeInfoMac->SetMIMEType(NS_LITERAL_CSTRING(APPLICATION_OCTET_STREAM));
     }
   }
   if (typeAppIsDefault || extAppIsDefault) {
     if (haveAppForExt)
       mimeInfoMac->AppendExtension(aFileExt);
     nsCOMPtr<nsILocalFileMac> app(do_CreateInstance(NS_LOCAL_FILE_CONTRACTID));
     if (!app) {
       [localPool release];
       return nullptr;
     }
     CFStringRef cfAppName = NULL;
     if (typeAppIsDefault) {
       app->InitWithFSRef(&typeAppFSRef);
       ::LSCopyItemAttribute((const FSRef *) &typeAppFSRef, kLSRolesAll,
                             kLSItemDisplayName, (CFTypeRef *) &cfAppName);
     } else {
       app->InitWithFSRef(&extAppFSRef);
       ::LSCopyItemAttribute((const FSRef *) &extAppFSRef, kLSRolesAll,
                             kLSItemDisplayName, (CFTypeRef *) &cfAppName);
     }
     if (cfAppName) {
       nsAutoTArray<UniChar, 255> buffer;
       CFIndex appNameLength = ::CFStringGetLength(cfAppName);
       buffer.SetLength(appNameLength);
       ::CFStringGetCharacters(cfAppName, CFRangeMake(0, appNameLength),
                               buffer.Elements());
       nsAutoString appName;
       appName.Assign(reinterpret_cast<char16_t*>(buffer.Elements()), appNameLength);
       mimeInfoMac->SetDefaultDescription(appName);
       ::CFRelease(cfAppName);
     }
     mimeInfoMac->SetDefaultApplication(app);
     mimeInfoMac->SetPreferredAction(nsIMIMEInfo::useSystemDefault);
   } else {
     mimeInfoMac->SetPreferredAction(nsIMIMEInfo::saveToDisk);
   }
   nsAutoCString mimeType;
   mimeInfoMac->GetMIMEType(mimeType);
   if (*aFound && !mimeType.IsEmpty()) {
     // If we have a MIME type, make sure its preferred extension is included
     // in our list.
     NSURLFileTypeMappings *map = [NSURLFileTypeMappings sharedMappings];
     NSString *typeStr = [NSString stringWithCString:mimeType.get() encoding:NSASCIIStringEncoding];
     NSString *extStr = map ? [map preferredExtensionForMIMEType:typeStr] : NULL;
     if (extStr) {
       nsAutoCString preferredExt;
       preferredExt.Assign((char *)[extStr cStringUsingEncoding:NSASCIIStringEncoding]);
       mimeInfoMac->AppendExtension(preferredExt);
     }
     CFStringRef cfType = ::CFStringCreateWithCString(NULL, mimeType.get(), kCFStringEncodingUTF8);
     if (cfType) {
       CFStringRef cfTypeDesc = NULL;
       if (::LSCopyKindStringForMIMEType(cfType, &cfTypeDesc) == noErr) {
         nsAutoTArray<UniChar, 255> buffer;
         CFIndex typeDescLength = ::CFStringGetLength(cfTypeDesc);
         buffer.SetLength(typeDescLength);
         ::CFStringGetCharacters(cfTypeDesc, CFRangeMake(0, typeDescLength),
                                 buffer.Elements());
         nsAutoString typeDesc;
         typeDesc.Assign(reinterpret_cast<char16_t*>(buffer.Elements()), typeDescLength);
         mimeInfoMac->SetDescription(typeDesc);
       }
       if (cfTypeDesc) {
         ::CFRelease(cfTypeDesc);
       }
       ::CFRelease(cfType);
     }
   }
   PR_LOG(mLog, PR_LOG_DEBUG, ("OS gave us: type '%s' found '%i'\n", mimeType.get(), *aFound));
   [localPool release];
   return mimeInfoMac.forget();
   NS_OBJC_END_TRY_ABORT_BLOCK_NSNULL;
 }
 NS_IMETHODIMP
 nsOSHelperAppService::GetProtocolHandlerInfoFromOS(const nsACString &aScheme,
                                                    bool *found,
                                                    nsIHandlerInfo **_retval)
 {
   NS_ASSERTION(!aScheme.IsEmpty(), "No scheme was specified!");
   nsresult rv = OSProtocolHandlerExists(nsPromiseFlatCString(aScheme).get(),
                                         found);
   if (NS_FAILED(rv))
     return rv;
   nsMIMEInfoMac *handlerInfo =
     new nsMIMEInfoMac(aScheme, nsMIMEInfoBase::eProtocolInfo);
   NS_ENSURE_TRUE(handlerInfo, NS_ERROR_OUT_OF_MEMORY);
   NS_ADDREF(*_retval = handlerInfo);
   if (!*found) {
     // Code that calls this requires an object regardless if the OS has
     // something for us, so we return the empty object.
     return NS_OK;
   }
   nsAutoString desc;
   GetApplicationDescription(aScheme, desc);
   handlerInfo->SetDefaultDescription(desc);
   return NS_OK;
 }

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uriloader/exthandler/mac/nsOSHelperAppService.mm@6474c204b198 (annotated)

uriloader/exthandler/mac/nsOSHelperAppService.mm