Reimplement click-to-pay links. Add OSX support.

Switch to using Qt's QLocalServer/QLocalSocket to handle bitcoin
payment links (bitcoin:... URIs)

Reason for switch: the boost::interprocess mechanism seemed flaky,
and doesn't mesh as well with "The Qt Way"

qtipcserver.cpp/h is replaced by paymentserver.cpp/h

Click-to-pay now also works on OSX, with a custom Info.plist
that registers Bitcoin-Qt as a handler for bitcoin: URLs and
an event listener on the main QApplication that handles
QFileOpenEvents (Qt translates 'url clicked' AppleEvents into
QFileOpenEvents automagically).

5 files changed, 237 insertions, 202 deletions

diff --git a/src/qt/bitcoin.cpp b/src/qt/bitcoin.cpp
index e5526a6c09..1b5ef28ba9 100644
--- a/src/qt/bitcoin.cpp
+++ b/src/qt/bitcoin.cpp
@@ -9,12 +9,13 @@
 #include "guiconstants.h"
 #include "init.h"
 #include "ui_interface.h"
-#include "qtipcserver.h"
+#include "paymentserver.h"
 
 #include <QApplication>
 #include <QMessageBox>
 #include <QTextCodec>
 #include <QLocale>
+#include <QTimer>
 #include <QTranslator>
 #include <QSplashScreen>
 #include <QLibraryInfo>
@@ -70,15 +71,6 @@ static bool ThreadSafeAskFee(int64 nFeeRequired)
     return payFee;
 }
 
-static void ThreadSafeHandleURI(const std::string& strURI)
-{
-    if(!guiref)
-        return;
-
-    QMetaObject::invokeMethod(guiref, "handleURI", GUIUtil::blockingGUIThreadConnection(),
-                               Q_ARG(QString, QString::fromStdString(strURI)));
-}
-
 static void InitMessage(const std::string &message)
 {
     if(splashref)
@@ -117,14 +109,6 @@ int main(int argc, char *argv[])
     // Command-line options take precedence:
     ParseParameters(argc, argv);
 
-    if(GetBoolArg("-testnet")) // Separate message queue name for testnet
-        strBitcoinURIQueueName = BITCOINURI_QUEUE_NAME_TESTNET;
-    else
-        strBitcoinURIQueueName = BITCOINURI_QUEUE_NAME_MAINNET;
-
-    // Do this early as we don't want to bother initializing if we are just calling IPC
-    ipcScanRelay(argc, argv);
-
     // Internal string conversion is all UTF-8
     QTextCodec::setCodecForTr(QTextCodec::codecForName("UTF-8"));
     QTextCodec::setCodecForCStrings(QTextCodec::codecForTr());
@@ -132,6 +116,12 @@ int main(int argc, char *argv[])
     Q_INIT_RESOURCE(bitcoin);
     QApplication app(argc, argv);
 
+    // Do this early as we don't want to bother initializing if we are just calling IPC
+    // ... but do it after creating app, so QCoreApplication::arguments is initialized:
+    if (PaymentServer::ipcSendCommandLine())
+        exit(0);
+    PaymentServer* paymentServer = new PaymentServer(&app);
+
     // Install global event filter that makes sure that long tooltips can be word-wrapped
     app.installEventFilter(new GUIUtil::ToolTipToRichTextFilter(TOOLTIP_WRAP_THRESHOLD, &app));
 
@@ -188,7 +178,6 @@ int main(int argc, char *argv[])
     // Subscribe to global signals from core
     uiInterface.ThreadSafeMessageBox.connect(ThreadSafeMessageBox);
     uiInterface.ThreadSafeAskFee.connect(ThreadSafeAskFee);
-    uiInterface.ThreadSafeHandleURI.connect(ThreadSafeHandleURI);
     uiInterface.InitMessage.connect(InitMessage);
     uiInterface.QueueShutdown.connect(QueueShutdown);
     uiInterface.Translate.connect(Translate);
@@ -249,8 +238,10 @@ int main(int argc, char *argv[])
                     window.show();
                 }
 
-                // Place this here as guiref has to be defined if we don't want to lose URIs
-                ipcInit(argc, argv);
+                // Now that initialization/startup is done, process any command-line
+                // bitcoin: URIs
+                QObject::connect(paymentServer, SIGNAL(receivedURI(QString)), &window, SLOT(handleURI(QString)));
+                QTimer::singleShot(100, paymentServer, SLOT(uiReady()));
 
                 app.exec();
 
diff --git a/src/qt/paymentserver.cpp b/src/qt/paymentserver.cpp
new file mode 100644
index 0000000000..05f2ac10e4
--- /dev/null
+++ b/src/qt/paymentserver.cpp
@@ -0,0 +1,159 @@
+// Copyright (c) 2009-2012 The Bitcoin developers
+// Distributed under the MIT/X11 software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include "paymentserver.h"
+#include "guiconstants.h"
+#include "ui_interface.h"
+#include "util.h"
+
+#include <QApplication>
+#include <QByteArray>
+#include <QCoreApplication>
+#include <QDataStream>
+#include <QDebug>
+#include <QFileOpenEvent>
+#include <QHash>
+#include <QLocalServer>
+#include <QLocalSocket>
+#include <QStringList>
+#include <QUrl>
+
+using namespace boost;
+
+const int BITCOIN_IPC_CONNECT_TIMEOUT = 1000; // milliseconds
+const QString BITCOIN_IPC_PREFIX("bitcoin:");
+
+//
+// Create a name that is unique for:
+//  testnet / non-testnet
+//  data directory
+//
+static QString ipcServerName()
+{
+    QString name("BitcoinQt");
+
+    // Append a simple hash of the datadir
+    // Note that GetDataDir(true) returns a different path
+    // for -testnet versus main net
+    QString ddir(GetDataDir(true).string().c_str());
+    name.append(QString::number(qHash(ddir)));
+
+    return name;
+}
+
+//
+// This stores payment requests received before
+// the main GUI window is up and ready to ask the user
+// to send payment.
+//
+static QStringList savedPaymentRequests;
+
+//
+// Sending to the server is done synchronously, at startup.
+// If the server isn't already running, startup continues,
+// and the items in savedPaymentRequest will be handled
+// when uiReady() is called.
+//
+bool PaymentServer::ipcSendCommandLine()
+{
+    bool fResult = false;
+
+    const QStringList& args = QCoreApplication::arguments();
+    for (int i = 1; i < args.size(); i++)
+    {
+        if (!args[i].startsWith(BITCOIN_IPC_PREFIX, Qt::CaseInsensitive))
+            continue;
+        savedPaymentRequests.append(args[i]);
+    }
+
+    foreach (const QString& arg, savedPaymentRequests)
+    {
+        QLocalSocket* socket = new QLocalSocket();
+        socket->connectToServer(ipcServerName(), QIODevice::WriteOnly);
+        if (!socket->waitForConnected(BITCOIN_IPC_CONNECT_TIMEOUT))
+            return false;
+
+        QByteArray block;
+        QDataStream out(&block, QIODevice::WriteOnly);
+        out.setVersion(QDataStream::Qt_4_0);
+        out << arg;
+        out.device()->seek(0);
+        socket->write(block);
+        socket->flush();
+
+        socket->waitForBytesWritten(BITCOIN_IPC_CONNECT_TIMEOUT);
+        socket->disconnectFromServer();
+        delete socket;
+        fResult = true;
+    }
+    return fResult;
+}
+
+PaymentServer::PaymentServer(QApplication* parent) : QObject(parent), saveURIs(true)
+{
+    // Install global event filter to catch QFileOpenEvents on the mac (sent when you click bitcoin: links)
+    parent->installEventFilter(this);
+
+    QString name = ipcServerName();
+
+    // Clean up old socket leftover from a crash:
+    QLocalServer::removeServer(name);
+
+    uriServer = new QLocalServer(this);
+
+    if (!uriServer->listen(name))
+        qDebug() << tr("Cannot start bitcoin: click-to-pay handler");
+    else
+        connect(uriServer, SIGNAL(newConnection()), this, SLOT(handleURIConnection()));
+}
+
+bool PaymentServer::eventFilter(QObject *object, QEvent *event)
+{
+    // clicking on bitcoin: URLs creates FileOpen events on the Mac:
+    if (event->type() == QEvent::FileOpen)
+    {
+        QFileOpenEvent* fileEvent = static_cast<QFileOpenEvent*>(event);
+        if (!fileEvent->url().isEmpty())
+        {
+            if (saveURIs) // Before main window is ready:
+                savedPaymentRequests.append(fileEvent->url().toString());
+            else
+                emit receivedURI(fileEvent->url().toString());
+            return true;
+        }
+    }
+    return false;
+}
+
+void PaymentServer::uiReady()
+{
+    saveURIs = false;
+    foreach (const QString& s, savedPaymentRequests)
+        emit receivedURI(s);
+    savedPaymentRequests.clear();
+}
+
+void PaymentServer::handleURIConnection()
+{
+    QLocalSocket *clientConnection = uriServer->nextPendingConnection();
+
+    while (clientConnection->bytesAvailable() < (int)sizeof(quint32))
+        clientConnection->waitForReadyRead();
+
+    connect(clientConnection, SIGNAL(disconnected()),
+            clientConnection, SLOT(deleteLater()));
+
+    QDataStream in(clientConnection);
+    in.setVersion(QDataStream::Qt_4_0);
+    if (clientConnection->bytesAvailable() < (int)sizeof(quint16)) {
+        return;
+    }
+    QString message;
+    in >> message;
+
+    if (saveURIs)
+        savedPaymentRequests.append(message);
+    else
+        emit receivedURI(message);
+}
diff --git a/src/qt/paymentserver.h b/src/qt/paymentserver.h
new file mode 100644
index 0000000000..cfc48afb38
--- /dev/null
+++ b/src/qt/paymentserver.h
@@ -0,0 +1,66 @@
+#ifndef PAYMENTSERVER_H
+#define PAYMENTSERVER_H
+
+//
+// This class handles payment requests from clicking on
+// bitcoin: URIs
+//
+// This is somewhat tricky, because we have to deal with
+// the situation where the user clicks on a link during
+// startup/initialization, when the splash-screen is up
+// but the main window (and the Send Coins tab) is not.
+//
+// So, the strategy is:
+//
+// Create the server, and register the event handler,
+// when the application is created. Save any URIs
+// received at or during startup in a list.
+//
+// When startup is finished and the main window is
+// show, a signal is sent to slot uiReady(), which
+// emits a receivedURL() signal for any payment
+// requests that happened during startup.
+//
+// After startup, receivedURL() happens as usual.
+//
+// This class has one more feature: a static
+// method that finds URIs passed in the command line
+// and, if a server is running in another process,
+// sends them to the server.
+//
+#include <QObject>
+#include <QString>
+
+class QApplication;
+class QLocalServer;
+
+class PaymentServer : public QObject
+{
+    Q_OBJECT
+private:
+    bool saveURIs;
+    QLocalServer* uriServer;
+
+public:
+    // Returns true if there were URIs on the command line
+    // which were successfully sent to an already-running
+    // process.
+    static bool ipcSendCommandLine();
+
+    PaymentServer(QApplication* parent);
+
+    bool eventFilter(QObject *object, QEvent *event);
+
+signals:
+    void receivedURI(QString);
+
+public slots:
+    // Signal this when the main window's UI is ready
+    // to display payment requests to the user
+    void uiReady();
+
+private slots:
+    void handleURIConnection();
+};
+
+#endif // PAYMENTSERVER_H
diff --git a/src/qt/qtipcserver.cpp b/src/qt/qtipcserver.cpp
deleted file mode 100644
index 2777fab852..0000000000
--- a/src/qt/qtipcserver.cpp
+++ /dev/null
@@ -1,165 +0,0 @@
-// Copyright (c) 2009-2012 The Bitcoin developers
-// Distributed under the MIT/X11 software license, see the accompanying
-// file COPYING or http://www.opensource.org/licenses/mit-license.php.
-
-#include <boost/version.hpp>
-#if defined(WIN32) && BOOST_VERSION == 104900
-#define BOOST_INTERPROCESS_HAS_WINDOWS_KERNEL_BOOTTIME
-#define BOOST_INTERPROCESS_HAS_KERNEL_BOOTTIME
-#endif
-
-#include "qtipcserver.h"
-#include "guiconstants.h"
-#include "ui_interface.h"
-#include "util.h"
-
-#include <boost/algorithm/string/predicate.hpp>
-#include <boost/date_time/posix_time/posix_time.hpp>
-#include <boost/interprocess/ipc/message_queue.hpp>
-#include <boost/version.hpp>
-
-#if defined(WIN32) && (!defined(BOOST_INTERPROCESS_HAS_WINDOWS_KERNEL_BOOTTIME) || !defined(BOOST_INTERPROCESS_HAS_KERNEL_BOOTTIME) || BOOST_VERSION < 104900)
-#warning Compiling without BOOST_INTERPROCESS_HAS_WINDOWS_KERNEL_BOOTTIME and BOOST_INTERPROCESS_HAS_KERNEL_BOOTTIME uncommented in boost/interprocess/detail/tmp_dir_helpers.hpp or using a boost version before 1.49 may have unintended results see svn.boost.org/trac/boost/ticket/5392
-#endif
-
-using namespace boost;
-using namespace boost::interprocess;
-using namespace boost::posix_time;
-
-// holds Bitcoin-Qt message queue name (initialized in bitcoin.cpp)
-std::string strBitcoinURIQueueName;
-
-#if defined MAC_OSX || defined __FreeBSD__
-// URI handling not implemented on OSX yet
-
-void ipcScanRelay(int argc, char *argv[]) { }
-void ipcInit(int argc, char *argv[]) { }
-
-#else
-
-static void ipcThread2(void* pArg);
-
-static bool ipcScanCmd(int argc, char *argv[], bool fRelay)
-{
-    // Check for URI in argv
-    bool fSent = false;
-    for (int i = 1; i < argc; i++)
-    {
-        if (boost::algorithm::istarts_with(argv[i], "bitcoin:"))
-        {
-            const char *strURI = argv[i];
-            try {
-                boost::interprocess::message_queue mq(boost::interprocess::open_only, strBitcoinURIQueueName.c_str());
-                if (mq.try_send(strURI, strlen(strURI), 0))
-                    fSent = true;
-                else if (fRelay)
-                    break;
-            }
-            catch (boost::interprocess::interprocess_exception &ex) {
-                // don't log the "file not found" exception, because that's normal for
-                // the first start of the first instance
-                if (ex.get_error_code() != boost::interprocess::not_found_error || !fRelay)
-                {
-                    printf("main() - boost interprocess exception #%d: %s\n", ex.get_error_code(), ex.what());
-                    break;
-                }
-            }
-        }
-    }
-    return fSent;
-}
-
-void ipcScanRelay(int argc, char *argv[])
-{
-    if (ipcScanCmd(argc, argv, true))
-        exit(0);
-}
-
-static void ipcThread(void* pArg)
-{
-    // Make this thread recognisable as the GUI-IPC thread
-    RenameThread("bitcoin-gui-ipc");
-
-    try
-    {
-        ipcThread2(pArg);
-    }
-    catch (std::exception& e) {
-        PrintExceptionContinue(&e, "ipcThread()");
-    } catch (...) {
-        PrintExceptionContinue(NULL, "ipcThread()");
-    }
-    printf("ipcThread exited\n");
-}
-
-static void ipcThread2(void* pArg)
-{
-    printf("ipcThread started\n");
-
-    message_queue* mq = (message_queue*)pArg;
-    char buffer[MAX_URI_LENGTH + 1] = "";
-    size_t nSize = 0;
-    unsigned int nPriority = 0;
-
-    loop
-    {
-        ptime d = boost::posix_time::microsec_clock::universal_time() + millisec(100);
-        if (mq->timed_receive(&buffer, sizeof(buffer), nSize, nPriority, d))
-        {
-            uiInterface.ThreadSafeHandleURI(std::string(buffer, nSize));
-            Sleep(1000);
-        }
-
-        if (fShutdown)
-            break;
-    }
-
-    // Remove message queue
-    message_queue::remove(strBitcoinURIQueueName.c_str());
-    // Cleanup allocated memory
-    delete mq;
-}
-
-void ipcInit(int argc, char *argv[])
-{
-    message_queue* mq = NULL;
-    char buffer[MAX_URI_LENGTH + 1] = "";
-    size_t nSize = 0;
-    unsigned int nPriority = 0;
-
-    try {
-        mq = new message_queue(open_or_create, strBitcoinURIQueueName.c_str(), 2, MAX_URI_LENGTH);
-
-        // Make sure we don't lose any bitcoin: URIs
-        for (int i = 0; i < 2; i++)
-        {
-            ptime d = boost::posix_time::microsec_clock::universal_time() + millisec(1);
-            if (mq->timed_receive(&buffer, sizeof(buffer), nSize, nPriority, d))
-            {
-                uiInterface.ThreadSafeHandleURI(std::string(buffer, nSize));
-            }
-            else
-                break;
-        }
-
-        // Make sure only one bitcoin instance is listening
-        message_queue::remove(strBitcoinURIQueueName.c_str());
-        delete mq;
-
-        mq = new message_queue(open_or_create, strBitcoinURIQueueName.c_str(), 2, MAX_URI_LENGTH);
-    }
-    catch (interprocess_exception &ex) {
-        printf("ipcInit() - boost interprocess exception #%d: %s\n", ex.get_error_code(), ex.what());
-        return;
-    }
-
-    if (!NewThread(ipcThread, mq))
-    {
-        delete mq;
-        return;
-    }
-
-    ipcScanCmd(argc, argv, false);
-}
-
-#endif
diff --git a/src/qt/qtipcserver.h b/src/qt/qtipcserver.h
deleted file mode 100644
index f775f272c2..0000000000
--- a/src/qt/qtipcserver.h
+++ /dev/null
@@ -1,16 +0,0 @@
-#ifndef QTIPCSERVER_H
-#define QTIPCSERVER_H
-
-#include <string>
-
-// Define Bitcoin-Qt message queue name for mainnet
-#define BITCOINURI_QUEUE_NAME_MAINNET "BitcoinURI"
-// Define Bitcoin-Qt message queue name for testnet
-#define BITCOINURI_QUEUE_NAME_TESTNET "BitcoinURI-testnet"
-
-extern std::string strBitcoinURIQueueName;
-
-void ipcScanRelay(int argc, char *argv[]);
-void ipcInit(int argc, char *argv[]);
-
-#endif // QTIPCSERVER_H