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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/browser/download/file_metadata_mac.h"
#include <ApplicationServices/ApplicationServices.h>
#include <Foundation/Foundation.h>
#include "base/files/file_path.h"
#include "base/logging.h"
#include "base/mac/mac_logging.h"
#include "base/mac/mac_util.h"
#include "base/mac/scoped_cftyperef.h"
#include "url/gurl.h"
namespace content {
// As of Mac OS X 10.4 ("Tiger"), files can be tagged with metadata describing
// various attributes. Metadata is integrated with the system's Spotlight
// feature and is searchable. Ordinarily, metadata can only be set by
// Spotlight importers, which requires that the importer own the target file.
// However, there's an attribute intended to describe the origin of a
// file, that can store the source URL and referrer of a downloaded file.
// It's stored as a "com.apple.metadata:kMDItemWhereFroms" extended attribute,
// structured as a binary1-format plist containing a list of sources. This
// attribute can only be populated by the downloader, not a Spotlight importer.
// Safari on 10.4 and later populates this attribute.
//
// With this metadata set, you can locate downloads by performing a Spotlight
// search for their source or referrer URLs, either from within the Spotlight
// UI or from the command line:
// mdfind 'kMDItemWhereFroms == "http://releases.mozilla.org/*"'
//
// There is no documented API to set metadata on a file directly as of the
// 10.5 SDK. The MDSetItemAttribute function does exist to perform this task,
// but it's undocumented.
void AddOriginMetadataToFile(const base::FilePath& file, const GURL& source,
const GURL& referrer) {
// There's no declaration for MDItemSetAttribute in any known public SDK.
// It exists in the 10.4 and 10.5 runtimes. To play it safe, do the lookup
// at runtime instead of declaring it ourselves and linking against what's
// provided. This has two benefits:
// - If Apple relents and declares the function in a future SDK (it's
// happened before), our build won't break.
// - If Apple removes or renames the function in a future runtime, the
// loader won't refuse to let the application launch. Instead, we'll
// silently fail to set any metadata.
typedef OSStatus (*MDItemSetAttribute_type)(MDItemRef, CFStringRef,
CFTypeRef);
static MDItemSetAttribute_type md_item_set_attribute_func = NULL;
static bool did_symbol_lookup = false;
if (!did_symbol_lookup) {
did_symbol_lookup = true;
CFBundleRef metadata_bundle =
CFBundleGetBundleWithIdentifier(CFSTR("com.apple.Metadata"));
if (!metadata_bundle)
return;
md_item_set_attribute_func = (MDItemSetAttribute_type)
CFBundleGetFunctionPointerForName(metadata_bundle,
CFSTR("MDItemSetAttribute"));
}
if (!md_item_set_attribute_func)
return;
NSString* file_path =
[NSString stringWithUTF8String:file.value().c_str()];
if (!file_path)
return;
base::ScopedCFTypeRef<MDItemRef> md_item(
MDItemCreate(NULL, base::mac::NSToCFCast(file_path)));
if (!md_item)
return;
// We won't put any more than 2 items into the attribute.
NSMutableArray* list = [NSMutableArray arrayWithCapacity:2];
// Follow Safari's lead: the first item in the list is the source URL of
// the downloaded file. If the referrer is known, store that, too.
NSString* origin_url = [NSString stringWithUTF8String:source.spec().c_str()];
if (origin_url)
[list addObject:origin_url];
NSString* referrer_url =
[NSString stringWithUTF8String:referrer.spec().c_str()];
if (referrer_url)
[list addObject:referrer_url];
md_item_set_attribute_func(md_item, kMDItemWhereFroms,
base::mac::NSToCFCast(list));
}
// The OS will automatically quarantine files due to the
// LSFileQuarantineEnabled entry in our Info.plist, but it knows relatively
// little about the files. We add more information about the download to
// improve the UI shown by the OS when the users tries to open the file.
void AddQuarantineMetadataToFile(const base::FilePath& file, const GURL& source,
const GURL& referrer) {
FSRef file_ref;
if (!base::mac::FSRefFromPath(file.value(), &file_ref))
return;
NSMutableDictionary* quarantine_properties = nil;
CFTypeRef quarantine_properties_base = NULL;
if (LSCopyItemAttribute(&file_ref, kLSRolesAll, kLSItemQuarantineProperties,
&quarantine_properties_base) == noErr) {
if (CFGetTypeID(quarantine_properties_base) ==
CFDictionaryGetTypeID()) {
// Quarantine properties will already exist if LSFileQuarantineEnabled
// is on and the file doesn't match an exclusion.
quarantine_properties =
[[(NSDictionary*)quarantine_properties_base mutableCopy] autorelease];
} else {
LOG(WARNING) << "kLSItemQuarantineProperties is not a dictionary on file "
<< file.value();
}
CFRelease(quarantine_properties_base);
}
if (!quarantine_properties) {
// If there are no quarantine properties, then the file isn't quarantined
// (e.g., because the user has set up exclusions for certain file types).
// We don't want to add any metadata, because that will cause the file to
// be quarantined against the user's wishes.
return;
}
// kLSQuarantineAgentNameKey, kLSQuarantineAgentBundleIdentifierKey, and
// kLSQuarantineTimeStampKey are set for us (see LSQuarantine.h), so we only
// need to set the values that the OS can't infer.
if (![quarantine_properties valueForKey:(NSString*)kLSQuarantineTypeKey]) {
CFStringRef type = source.SchemeIsHTTPOrHTTPS()
? kLSQuarantineTypeWebDownload
: kLSQuarantineTypeOtherDownload;
[quarantine_properties setValue:(NSString*)type
forKey:(NSString*)kLSQuarantineTypeKey];
}
if (![quarantine_properties
valueForKey:(NSString*)kLSQuarantineOriginURLKey] &&
referrer.is_valid()) {
NSString* referrer_url =
[NSString stringWithUTF8String:referrer.spec().c_str()];
[quarantine_properties setValue:referrer_url
forKey:(NSString*)kLSQuarantineOriginURLKey];
}
if (![quarantine_properties valueForKey:(NSString*)kLSQuarantineDataURLKey] &&
source.is_valid()) {
NSString* origin_url =
[NSString stringWithUTF8String:source.spec().c_str()];
[quarantine_properties setValue:origin_url
forKey:(NSString*)kLSQuarantineDataURLKey];
}
OSStatus os_error = LSSetItemAttribute(&file_ref, kLSRolesAll,
kLSItemQuarantineProperties,
quarantine_properties);
if (os_error != noErr) {
OSSTATUS_LOG(WARNING, os_error)
<< "Unable to set quarantine attributes on file " << file.value();
}
}
} // namespace content
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