Add quarantine metadata to downloads on the Mac.

chrome/common/quarantine_mac.mm

Index: chrome/common/quarantine_mac.mm
===================================================================
--- chrome/common/quarantine_mac.mm	(revision 0)
+++ chrome/common/quarantine_mac.mm	(revision 0)
@@ -0,0 +1,90 @@
+// Copyright (c) 2009 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 "chrome/common/quarantine_mac.h"
+
+#include <ApplicationServices/ApplicationServices.h>
+#import <Foundation/Foundation.h>
+
+#include "base/file_path.h"
+#include "base/logging.h"
+#include "base/mac_util.h"
+#include "googleurl/src/gurl.h"
+
+namespace quarantine_mac {
+
+// 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 FilePath& file, const GURL& source,
+                                 const GURL& referrer) {
+  FSRef file_ref;
+  if (!mac_util::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.SchemeIs("http") || source.SchemeIs("https"))
+                       ? 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) {
+    LOG(WARNING) << "Unable to set quarantine attributes on file "
+                 << file.value();
+  }
+}
+
+}  // namespace quarantine_mac