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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.
#import "content/browser/web_contents/web_drag_source_mac.h"
#include <sys/param.h>
#include "base/bind.h"
#include "base/file_path.h"
#include "base/pickle.h"
#include "base/string_util.h"
#include "base/sys_string_conversions.h"
#include "base/threading/thread.h"
#include "base/threading/thread_restrictions.h"
#include "base/utf_string_conversions.h"
#include "content/browser/browser_thread_impl.h"
#include "content/browser/download/drag_download_file.h"
#include "content/browser/download/drag_download_util.h"
#include "content/browser/renderer_host/render_view_host_impl.h"
#include "content/browser/web_contents/web_contents_impl.h"
#include "content/public/browser/content_browser_client.h"
#include "content/public/common/content_client.h"
#include "content/public/common/url_constants.h"
#include "grit/ui_resources.h"
#include "net/base/escape.h"
#include "net/base/file_stream.h"
#include "net/base/net_util.h"
#include "ui/base/clipboard/custom_data_helper.h"
#include "ui/base/dragdrop/cocoa_dnd_util.h"
#include "ui/gfx/image/image.h"
#include "ui/gfx/mac/nsimage_cache.h"
#include "webkit/glue/webdropdata.h"
using base::SysNSStringToUTF8;
using base::SysUTF8ToNSString;
using base::SysUTF16ToNSString;
using content::BrowserThread;
using content::DragDownloadFile;
using content::PromiseFileFinalizer;
using content::RenderViewHostImpl;
using net::FileStream;
namespace {
// An unofficial standard pasteboard title type to be provided alongside the
// |NSURLPboardType|.
NSString* const kNSURLTitlePboardType = @"public.url-name";
// Converts a string16 into a FilePath. Use this method instead of
// -[NSString fileSystemRepresentation] to prevent exceptions from being thrown.
// See http://crbug.com/78782 for more info.
FilePath FilePathFromFilename(const string16& filename) {
NSString* str = SysUTF16ToNSString(filename);
char buf[MAXPATHLEN];
if (![str getFileSystemRepresentation:buf maxLength:sizeof(buf)])
return FilePath();
return FilePath(buf);
}
// Returns a filename appropriate for the drop data
// TODO(viettrungluu): Refactor to make it common across platforms,
// and move it somewhere sensible.
FilePath GetFileNameFromDragData(const WebDropData& drop_data) {
FilePath file_name(FilePathFromFilename(drop_data.file_description_filename));
// Images without ALT text will only have a file extension so we need to
// synthesize one from the provided extension and URL.
if (file_name.empty()) {
// Retrieve the name from the URL.
string16 suggested_filename =
net::GetSuggestedFilename(drop_data.url, "", "", "", "", "");
const std::string extension = file_name.Extension();
file_name = FilePathFromFilename(suggested_filename);
file_name = file_name.ReplaceExtension(extension);
}
return file_name;
}
// This helper's sole task is to write out data for a promised file; the caller
// is responsible for opening the file. It takes the drop data and an open file
// stream.
void PromiseWriterHelper(const WebDropData& drop_data,
scoped_ptr<FileStream> file_stream) {
DCHECK(file_stream);
file_stream->WriteSync(drop_data.file_contents.data(),
drop_data.file_contents.length());
}
} // namespace
@interface WebDragSource(Private)
- (void)fillPasteboard;
- (NSImage*)dragImage;
@end // @interface WebDragSource(Private)
@implementation WebDragSource
- (id)initWithContents:(content::WebContentsImpl*)contents
view:(NSView*)contentsView
dropData:(const WebDropData*)dropData
image:(NSImage*)image
offset:(NSPoint)offset
pasteboard:(NSPasteboard*)pboard
dragOperationMask:(NSDragOperation)dragOperationMask {
if ((self = [super init])) {
contents_ = contents;
DCHECK(contents_);
contentsView_ = contentsView;
DCHECK(contentsView_);
dropData_.reset(new WebDropData(*dropData));
DCHECK(dropData_.get());
dragImage_.reset([image retain]);
imageOffset_ = offset;
pasteboard_.reset([pboard retain]);
DCHECK(pasteboard_.get());
dragOperationMask_ = dragOperationMask;
fileExtension_ = nil;
[self fillPasteboard];
}
return self;
}
- (void)clearWebContentsView {
contents_ = nil;
contentsView_ = nil;
}
- (NSDragOperation)draggingSourceOperationMaskForLocal:(BOOL)isLocal {
return dragOperationMask_;
}
- (void)lazyWriteToPasteboard:(NSPasteboard*)pboard forType:(NSString*)type {
// NSHTMLPboardType requires the character set to be declared. Otherwise, it
// assumes US-ASCII. Awesome.
const string16 kHtmlHeader = ASCIIToUTF16(
"<meta http-equiv=\"Content-Type\" content=\"text/html;charset=UTF-8\">");
// Be extra paranoid; avoid crashing.
if (!dropData_.get()) {
NOTREACHED();
return;
}
// HTML.
if ([type isEqualToString:NSHTMLPboardType]) {
DCHECK(!dropData_->html.string().empty());
// See comment on |kHtmlHeader| above.
[pboard setString:SysUTF16ToNSString(kHtmlHeader + dropData_->html.string())
forType:NSHTMLPboardType];
// URL.
} else if ([type isEqualToString:NSURLPboardType]) {
DCHECK(dropData_->url.is_valid());
NSURL* url = [NSURL URLWithString:SysUTF8ToNSString(dropData_->url.spec())];
// If NSURL creation failed, check for a badly-escaped JavaScript URL.
// Strip out any existing escapes and then re-escape uniformly.
if (!url && dropData_->url.SchemeIs(chrome::kJavaScriptScheme)) {
net::UnescapeRule::Type unescapeRules =
net::UnescapeRule::SPACES |
net::UnescapeRule::URL_SPECIAL_CHARS |
net::UnescapeRule::CONTROL_CHARS;
std::string unescapedUrlString =
net::UnescapeURLComponent(dropData_->url.spec(), unescapeRules);
std::string escapedUrlString =
net::EscapeUrlEncodedData(unescapedUrlString, false);
url = [NSURL URLWithString:SysUTF8ToNSString(escapedUrlString)];
}
[url writeToPasteboard:pboard];
// URL title.
} else if ([type isEqualToString:kNSURLTitlePboardType]) {
[pboard setString:SysUTF16ToNSString(dropData_->url_title)
forType:kNSURLTitlePboardType];
// File contents.
} else if ([type isEqualToString:NSFileContentsPboardType] ||
(fileExtension_ &&
[type isEqualToString:NSCreateFileContentsPboardType(fileExtension_)])) {
// TODO(viettrungluu: find something which is known to accept
// NSFileContentsPboardType to check that this actually works!
scoped_nsobject<NSFileWrapper> file_wrapper(
[[NSFileWrapper alloc] initRegularFileWithContents:[NSData
dataWithBytes:dropData_->file_contents.data()
length:dropData_->file_contents.length()]]);
[file_wrapper setPreferredFilename:SysUTF8ToNSString(
GetFileNameFromDragData(*dropData_).value())];
[pboard writeFileWrapper:file_wrapper];
// TIFF.
} else if ([type isEqualToString:NSTIFFPboardType]) {
// TODO(viettrungluu): This is a bit odd since we rely on Cocoa to render
// our image into a TIFF. This is also suboptimal since this is all done
// synchronously. I'm not sure there's much we can easily do about it.
scoped_nsobject<NSImage> image(
[[NSImage alloc] initWithData:[NSData
dataWithBytes:dropData_->file_contents.data()
length:dropData_->file_contents.length()]]);
[pboard setData:[image TIFFRepresentation] forType:NSTIFFPboardType];
// Plain text.
} else if ([type isEqualToString:NSStringPboardType]) {
DCHECK(!dropData_->text.string().empty());
[pboard setString:SysUTF16ToNSString(dropData_->text.string())
forType:NSStringPboardType];
// Custom MIME data.
} else if ([type isEqualToString:ui::kWebCustomDataPboardType]) {
Pickle pickle;
ui::WriteCustomDataToPickle(dropData_->custom_data, &pickle);
[pboard setData:[NSData dataWithBytes:pickle.data() length:pickle.size()]
forType:ui::kWebCustomDataPboardType];
// Oops!
} else {
// Unknown drag pasteboard type.
NOTREACHED();
}
}
- (NSPoint)convertScreenPoint:(NSPoint)screenPoint {
DCHECK([contentsView_ window]);
NSPoint basePoint = [[contentsView_ window] convertScreenToBase:screenPoint];
return [contentsView_ convertPoint:basePoint fromView:nil];
}
- (void)startDrag {
NSEvent* currentEvent = [NSApp currentEvent];
// Synthesize an event for dragging, since we can't be sure that
// [NSApp currentEvent] will return a valid dragging event.
NSWindow* window = [contentsView_ window];
NSPoint position = [window mouseLocationOutsideOfEventStream];
NSTimeInterval eventTime = [currentEvent timestamp];
NSEvent* dragEvent = [NSEvent mouseEventWithType:NSLeftMouseDragged
location:position
modifierFlags:NSLeftMouseDraggedMask
timestamp:eventTime
windowNumber:[window windowNumber]
context:nil
eventNumber:0
clickCount:1
pressure:1.0];
if (dragImage_) {
position.x -= imageOffset_.x;
// Deal with Cocoa's flipped coordinate system.
position.y -= [dragImage_.get() size].height - imageOffset_.y;
}
// Per kwebster, offset arg is ignored, see -_web_DragImageForElement: in
// third_party/WebKit/Source/WebKit/mac/Misc/WebNSViewExtras.m.
[window dragImage:[self dragImage]
at:position
offset:NSZeroSize
event:dragEvent
pasteboard:pasteboard_
source:contentsView_
slideBack:YES];
}
- (void)endDragAt:(NSPoint)screenPoint
operation:(NSDragOperation)operation {
if (!contents_)
return;
contents_->SystemDragEnded();
RenderViewHostImpl* rvh = static_cast<RenderViewHostImpl*>(
contents_->GetRenderViewHost());
if (rvh) {
// Convert |screenPoint| to view coordinates and flip it.
NSPoint localPoint = NSMakePoint(0, 0);
if ([contentsView_ window])
localPoint = [self convertScreenPoint:screenPoint];
NSRect viewFrame = [contentsView_ frame];
localPoint.y = viewFrame.size.height - localPoint.y;
// Flip |screenPoint|.
NSRect screenFrame = [[[contentsView_ window] screen] frame];
screenPoint.y = screenFrame.size.height - screenPoint.y;
// If AppKit returns a copy and move operation, mask off the move bit
// because WebCore does not understand what it means to do both, which
// results in an assertion failure/renderer crash.
if (operation == (NSDragOperationMove | NSDragOperationCopy))
operation &= ~NSDragOperationMove;
rvh->DragSourceEndedAt(localPoint.x, localPoint.y,
screenPoint.x, screenPoint.y,
static_cast<WebKit::WebDragOperation>(operation));
}
// Make sure the pasteboard owner isn't us.
[pasteboard_ declareTypes:[NSArray array] owner:nil];
}
- (void)moveDragTo:(NSPoint)screenPoint {
if (!contents_)
return;
RenderViewHostImpl* rvh = static_cast<RenderViewHostImpl*>(
contents_->GetRenderViewHost());
if (rvh) {
// Convert |screenPoint| to view coordinates and flip it.
NSPoint localPoint = NSMakePoint(0, 0);
if ([contentsView_ window])
localPoint = [self convertScreenPoint:screenPoint];
NSRect viewFrame = [contentsView_ frame];
localPoint.y = viewFrame.size.height - localPoint.y;
// Flip |screenPoint|.
NSRect screenFrame = [[[contentsView_ window] screen] frame];
screenPoint.y = screenFrame.size.height - screenPoint.y;
rvh->DragSourceMovedTo(localPoint.x, localPoint.y,
screenPoint.x, screenPoint.y);
}
}
- (NSString*)dragPromisedFileTo:(NSString*)path {
// Be extra paranoid; avoid crashing.
if (!dropData_.get()) {
NOTREACHED() << "No drag-and-drop data available for promised file.";
return nil;
}
FilePath fileName = downloadFileName_.empty() ?
GetFileNameFromDragData(*dropData_) : downloadFileName_;
FilePath filePath(SysNSStringToUTF8(path));
filePath = filePath.Append(fileName);
// CreateFileStreamForDrop() will call file_util::PathExists(),
// which is blocking. Since this operation is already blocking the
// UI thread on OSX, it should be reasonable to let it happen.
base::ThreadRestrictions::ScopedAllowIO allowIO;
scoped_ptr<FileStream> fileStream(content::CreateFileStreamForDrop(
&filePath, content::GetContentClient()->browser()->GetNetLog()));
if (!fileStream.get())
return nil;
if (downloadURL_.is_valid()) {
scoped_refptr<DragDownloadFile> dragFileDownloader(new DragDownloadFile(
filePath,
fileStream.Pass(),
downloadURL_,
content::Referrer(contents_->GetURL(), dropData_->referrer_policy),
contents_->GetEncoding(),
contents_));
// The finalizer will take care of closing and deletion.
dragFileDownloader->Start(new PromiseFileFinalizer(dragFileDownloader));
} else {
// The writer will take care of closing and deletion.
BrowserThread::PostTask(BrowserThread::FILE,
FROM_HERE,
base::Bind(&PromiseWriterHelper,
*dropData_,
base::Passed(&fileStream)));
}
// Once we've created the file, we should return the file name.
return SysUTF8ToNSString(filePath.BaseName().value());
}
@end // @implementation WebDragSource
@implementation WebDragSource (Private)
- (void)fillPasteboard {
DCHECK(pasteboard_.get());
[pasteboard_
declareTypes:[NSArray arrayWithObject:ui::kChromeDragDummyPboardType]
owner:contentsView_];
// HTML.
if (!dropData_->html.string().empty())
[pasteboard_ addTypes:[NSArray arrayWithObject:NSHTMLPboardType]
owner:contentsView_];
// URL (and title).
if (dropData_->url.is_valid())
[pasteboard_ addTypes:[NSArray arrayWithObjects:NSURLPboardType,
kNSURLTitlePboardType, nil]
owner:contentsView_];
std::string fileExtension;
// File.
if (!dropData_->file_contents.empty() ||
!dropData_->download_metadata.empty()) {
if (dropData_->download_metadata.empty()) {
fileExtension = GetFileNameFromDragData(*dropData_).Extension();
} else {
string16 mimeType;
FilePath fileName;
if (content::ParseDownloadMetadata(
dropData_->download_metadata,
&mimeType,
&fileName,
&downloadURL_)) {
// Generate the file name based on both mime type and proposed file
// name.
std::string defaultName =
content::GetContentClient()->browser()->GetDefaultDownloadName();
downloadFileName_ =
net::GenerateFileName(downloadURL_,
std::string(),
std::string(),
fileName.value(),
UTF16ToUTF8(mimeType),
defaultName);
fileExtension = downloadFileName_.Extension();
}
}
if (!fileExtension.empty()) {
// Strip the leading dot.
fileExtension_ = SysUTF8ToNSString(fileExtension.substr(1));
// File contents (with and without specific type), and file (HFS) promise.
// TODO(viettrungluu): others?
NSArray* types = [NSArray arrayWithObjects:
NSFileContentsPboardType,
NSCreateFileContentsPboardType(fileExtension_),
NSFilesPromisePboardType,
nil];
[pasteboard_ addTypes:types owner:contentsView_];
if (!dropData_->file_contents.empty()) {
[pasteboard_ addTypes:[NSArray arrayWithObject:NSTIFFPboardType]
owner:contentsView_];
}
// For the file promise, we need to specify the extension.
[pasteboard_ setPropertyList:[NSArray arrayWithObject:fileExtension_]
forType:NSFilesPromisePboardType];
}
}
// Plain text.
if (!dropData_->text.string().empty())
[pasteboard_ addTypes:[NSArray arrayWithObject:NSStringPboardType]
owner:contentsView_];
if (!dropData_->custom_data.empty()) {
[pasteboard_
addTypes:[NSArray arrayWithObject:ui::kWebCustomDataPboardType]
owner:contentsView_];
}
}
- (NSImage*)dragImage {
if (dragImage_)
return dragImage_;
// Default to returning a generic image.
return content::GetContentClient()->GetNativeImageNamed(
IDR_DEFAULT_FAVICON).ToNSImage();
}
@end // @implementation WebDragSource (Private)
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