Merge branch 'toxuri'

qtox.pro

@@ -149,7 +149,10 @@ HEADERS  += src/widget/form/addfriendform.h \
     src/widget/form/setpassworddialog.h \
     src/widget/form/tabcompleter.h \
     src/video/videoframe.h \
-    src/misc/flowlayout.h
+    src/misc/flowlayout.h \
+    src/ipc.h \
+    src/widget/toxuri.h \
+    src/toxdns.h
 
 SOURCES += \
     src/widget/form/addfriendform.cpp \
@@ -208,4 +211,7 @@ SOURCES += \
     src/video/netvideosource.cpp \
     src/widget/form/tabcompleter.cpp \
     src/video/videoframe.cpp \
-    src/misc/flowlayout.cpp
+    src/misc/flowlayout.cpp \
+    src/widget/toxuri.cpp \
+    src/toxdns.cpp \
+    src/ipc.cpp

src/core.cpp

@@ -47,7 +47,7 @@ QList<ToxFile> Core::fileSendQueue;
 QList<ToxFile> Core::fileRecvQueue;
 
 Core::Core(Camera* cam, QThread *coreThread, QString loadPath) :
-    tox(nullptr), camera(cam), loadPath(loadPath)
+    tox(nullptr), camera(cam), loadPath(loadPath), ready{false}
 {
     qDebug() << "Core: loading Tox from" << loadPath;
 
@@ -297,6 +297,8 @@ void Core::start()
     else
         qDebug() << "Core: Error loading self avatar";
     
+    ready = true;
+
     process(); // starts its own timer
 }
 
@@ -1353,8 +1355,9 @@ void Core::switchConfiguration(const QString& profile)
     saveConfiguration();
     clearPassword(ptMain);
     clearPassword(ptHistory);
-    toxTimer->stop();
 
+    ready = false;
+    toxTimer->stop();
     Widget::getInstance()->setEnabledThreadsafe(false);
     if (tox) {
         toxav_kill(toxav);
@@ -1747,3 +1750,8 @@ QString Core::getPeerName(const ToxID& id) const
     delete[] cname;
     return name;
 }
+
+bool Core::isReady()
+{
+    return ready;
+}

src/core.h

@@ -69,6 +69,7 @@ public:
 
     bool anyActiveCalls(); ///< true is any calls are currently active (note: a call about to start is not yet active)
     bool isPasswordSet(PasswordType passtype);
+    bool isReady(); ///< Most of the API shouldn't be used until Core is ready, call start() first
 
 public slots:
     void start(); ///< Initializes the core, must be called before anything else
@@ -260,6 +261,7 @@ private:
     static QList<ToxFile> fileSendQueue, fileRecvQueue;
     static ToxCall calls[];
     QMutex fileSendMutex;
+    bool ready;
 
     uint8_t* pwsaltedkeys[PasswordType::ptCounter]; // use the pw's hash as the "pw"
 

src/corestructs.cpp

@@ -1,6 +1,10 @@
 #include "src/corestructs.h"
 #include "src/core.h"
+#include <tox/tox.h>
 #include <QFile>
+#include <QRegularExpression>
+
+#define TOX_ID_LENGTH 2*TOX_FRIEND_ADDRESS_SIZE
 
 ToxFile::ToxFile(int FileNum, int FriendId, QByteArray FileName, QString FilePath, FileDirection Direction)
     : fileNum(FileNum), friendId(FriendId), fileName{FileName}, filePath{FilePath}, file{new QFile(filePath)},
@@ -48,3 +52,9 @@ bool ToxID::isMine() const
 {
     return *this == Core::getInstance()->getSelfId();
 }
+
+bool ToxID::isToxId(const QString& value)
+{
+    const QRegularExpression hexRegExp("^[A-Fa-f0-9]+$");
+    return value.length() == TOX_ID_LENGTH && value.contains(hexRegExp);
+}

src/corestructs.h

@@ -21,7 +21,8 @@ struct ToxID
     QString checkSum;
 
     QString toString() const;
-    ToxID static fromString(QString id);
+    static ToxID fromString(QString id);
+    static bool isToxId(const QString& id);
 
     bool operator==(const ToxID& other) const;
     bool operator!=(const ToxID& other) const;

src/ipc.cpp

@@ -0,0 +1,254 @@
+#include "src/ipc.h"
+#include <QDebug>
+#include <QCoreApplication>
+
+IPC::IPC() :
+    globalMemory{"qtox"}
+{
+    qRegisterMetaType<IPCEventHandler>("IPCEventHandler");
+
+    ownerTimer.setInterval(EVENT_TIMER_MS);
+    ownerTimer.setSingleShot(true);
+    connect(&ownerTimer, &QTimer::timeout, this, &IPC::processEvents);
+
+    // The first started instance gets to manage the shared memory by taking ownership
+    // Every time it processes events it updates the global shared timestamp
+    // If the timestamp isn't updated, that's a timeout and someone else can take ownership
+    // This is a safety measure, in case one of the clients crashes
+    // If the owner exits normally, it can set the timestamp to 0 first to immediately give ownership
+    // We keep one shared page, starting with the 64bit ID of the current owner and last timestamp
+    // then various events to be processed by the owner with a 16bit size then data each
+    // Each event is in its own chunk of data, the last chunk is followed by a chunk of size 0
+
+    qsrand(time(0));
+    globalId = ((uint64_t)qrand()) * ((uint64_t)qrand()) * ((uint64_t)qrand());
+    qDebug() << "IPC: Our global ID is "<<globalId;
+    if (globalMemory.create(MEMORY_SIZE))
+    {
+        qDebug() << "IPC: Creating the global shared memory and taking ownership";
+        if (globalMemory.lock())
+        {
+            *(uint64_t*)globalMemory.data() = globalId;
+            updateGlobalTimestamp();
+            globalMemory.unlock();
+        }
+        else
+        {
+            qWarning() << "IPC: Couldn't lock to take ownership";
+        }
+    }
+    else if (globalMemory.attach())
+    {
+        qDebug() << "IPC: Attaching to the global shared memory";
+    }
+    else
+    {
+        qDebug() << "IPC: Failed to attach to the global shared memory, giving up";
+        return; // We won't be able to do any IPC without being attached, let's get outta here
+    }
+
+    ownerTimer.start();
+}
+
+IPC::~IPC()
+{
+
+}
+
+bool IPC::isCurrentOwner()
+{
+    if (globalMemory.lock())
+    {
+        bool isOwner = ((*(uint64_t*)globalMemory.data()) == globalId);
+        globalMemory.unlock();
+        return isOwner;
+    }
+    else
+    {
+        qWarning() << "IPC:isCurrentOwner failed to lock, returning false";
+        return false;
+    }
+}
+
+void IPC::registerEventHandler(IPCEventHandler handler)
+{
+    eventHandlers += handler;
+}
+
+void IPC::processEvents()
+{
+    if (globalMemory.lock())
+    {
+        lastSeenTimestamp = getGlobalTimestamp();
+
+        // Only the owner processes events. But if the previous owner's dead, we can take ownership now
+        if (*(uint64_t*)globalMemory.data() != globalId)
+        {
+            if (difftime(time(0), getGlobalTimestamp()) >= OWNERSHIP_TIMEOUT_S)
+            {
+                qDebug() << "IPC: Previous owner timed out, taking ownership";
+                *(uint64_t*)globalMemory.data() = globalId;
+            }
+            else
+            {
+                goto unlockAndRestartTimer;
+            }
+        }
+
+        // We're the owner, let's process those events
+        forever {
+            QByteArray eventData = fetchEvent();
+            if (eventData.isEmpty())
+                break;
+
+            qDebug() << "IPC: Processing event: "<<eventData;
+            for (const IPCEventHandler& handler : eventHandlers)
+               runEventHandler(handler, eventData);
+        }
+
+        updateGlobalTimestamp();
+        goto unlockAndRestartTimer;
+    }
+    else
+    {
+        qWarning() << "IPC:processEvents failed to lock";
+        goto restartTimer;
+    }
+
+    // Centralized cleanup. Always restart the timer, unlock only if we locked successfully.
+unlockAndRestartTimer:
+    globalMemory.unlock();
+restartTimer:
+    ownerTimer.start();
+    return;
+}
+
+time_t IPC::postEvent(const QByteArray& data)
+{
+    int dataSize = data.size();
+    if (dataSize >= 65535)
+    {
+        qWarning() << "IPC: sendEvent: Too much data for a single chunk, giving up";
+        return 0;
+    }
+
+    if (globalMemory.lock())
+    {
+        // Check that we have enough room for that new chunk
+        char* nextChunk = getFirstFreeChunk();
+        if (nextChunk == nullptr
+            || nextChunk + 2 + dataSize + 2 - (char*)globalMemory.data() >= MEMORY_SIZE)
+        {
+            qWarning() << "IPC: sendEvent: Not enough memory left, giving up";
+            return 0;
+        }
+
+        // Commit the new chunk to shared memory
+        *(uint16_t*)nextChunk = dataSize;
+        memcpy(nextChunk+2, data.data(), dataSize);
+        *(uint16_t*)(nextChunk+2+dataSize) = 0;
+
+        globalMemory.unlock();
+        qDebug() << "IPC: Posted event: "<<data;
+        return time(0);
+    }
+    else
+    {
+        qWarning() << "IPC: sendEvent failed to lock, giving up";
+        return 0;
+    }
+}
+
+char* IPC::getFirstFreeChunk()
+{
+    char* ptr = (char*)globalMemory.data() + MEMORY_HEADER_SIZE;
+
+    forever
+    {
+        uint16_t chunkSize = *(uint16_t*)ptr;
+
+        if (!chunkSize)
+            return ptr;
+
+        if ((ptr + chunkSize + 2) - (char*)globalMemory.data() >= MEMORY_SIZE)
+            return nullptr;
+
+        ptr += chunkSize;
+    }
+    return nullptr; // Never reached
+}
+
+char* IPC::getLastUsedChunk()
+{
+    char* ptr = (char*)globalMemory.data() + MEMORY_HEADER_SIZE;
+    char* lastPtr = nullptr;
+
+    forever
+    {
+        uint16_t chunkSize = *(uint16_t*)ptr;
+
+        if (!chunkSize)
+            return lastPtr;
+
+        if ((ptr + chunkSize + 2) - (char*)globalMemory.data() > MEMORY_SIZE)
+            return lastPtr;
+
+        lastPtr = ptr;
+        ptr += chunkSize;
+    }
+    return nullptr; // Never reached
+}
+
+QByteArray IPC::fetchEvent()
+{
+    QByteArray eventData;
+
+    // Get a pointer to the last chunk
+    char* nextChunk = getLastUsedChunk();
+    if (nextChunk == nullptr)
+        return eventData;
+
+    // Read that chunk and remove it from memory
+    uint16_t dataSize = *(uint16_t*)nextChunk;
+    *(uint16_t*)nextChunk = 0;
+    eventData.resize(dataSize);
+    memcpy(eventData.data(), nextChunk+2, dataSize);
+
+    return eventData;
+}
+
+void IPC::updateGlobalTimestamp()
+{
+    *(time_t*)((char*)globalMemory.data()+sizeof(globalId)) = time(0);
+}
+
+time_t IPC::getGlobalTimestamp()
+{
+    return *(time_t*)((char*)globalMemory.data()+sizeof(globalId));
+}
+
+bool IPC::isEventProcessed(time_t postTime)
+{
+    return (difftime(lastSeenTimestamp, postTime) > 0);
+}
+
+void IPC::waitUntilProcessed(time_t postTime)
+{
+    while (difftime(lastSeenTimestamp, postTime) <= 0)
+        qApp->processEvents();
+}
+
+void IPC::runEventHandler(IPCEventHandler handler, const QByteArray& arg)
+{
+    if (QThread::currentThread() != qApp->thread())
+    {
+        QMetaObject::invokeMethod(this, "runEventHandler", Qt::BlockingQueuedConnection,
+                                  Q_ARG(IPCEventHandler, handler), Q_ARG(const QByteArray&, arg));
+        return;
+    }
+    else
+    {
+        handler(arg);
+        return;
+    }
+}

src/ipc.h

@@ -0,0 +1,67 @@
+#ifndef IPC_H
+#define IPC_H
+
+#include <QSharedMemory>
+#include <QTimer>
+#include <QObject>
+#include <QThread>
+#include <QVector>
+#include <functional>
+#include <ctime>
+
+/// Handles an IPC event, must filter out and ignore events it doesn't recognize
+using IPCEventHandler = std::function<void (const QByteArray&)>;
+
+/// Class used for inter-process communication with other qTox instances
+/// IPC event handlers will be called from the GUI thread after its event loop starts
+class IPC : public QThread
+{
+    Q_OBJECT
+
+public:
+    IPC();
+    ~IPC();
+    /// Posts an event to the global shared memory, returns the time at wich it was posted
+    time_t postEvent(const QByteArray& data);
+    bool isCurrentOwner(); ///< Returns whether we're responsible for event processing of the global shared memory
+    void registerEventHandler(IPCEventHandler handler); ///< Registers a function to be called whenever an event is received
+    bool isEventProcessed(time_t postTime); ///< Returns wether a previously posted event was already processed
+    void waitUntilProcessed(time_t postTime); ///< Blocks until a previously posted event is processed
+
+protected slots:
+    void processEvents();
+
+private:
+    /// Runs an IPC event handler from the main (GUI) thread, will block until the handler returns
+    Q_INVOKABLE void runEventHandler(IPCEventHandler handler, const QByteArray& arg);
+    /// Assumes that the memory IS LOCKED
+    /// Returns a pointer to the first free chunk of shared memory or a nullptr on error
+    char* getFirstFreeChunk();
+    /// Assumes that the memory IS LOCKED
+    /// Returns a pointer to the last used chunk of shared memory or a nullptr on error
+    char* getLastUsedChunk();
+    /// Assumes that the memory IS LOCKED
+    /// Removes the last event from the shared memory and returns its data, or an empty object on error
+    QByteArray fetchEvent();
+    /// Assumes that the memory IS LOCKED
+    /// Updates the global shared timestamp
+    void updateGlobalTimestamp();
+    /// Assumes that the memory IS LOCKED
+    /// Returns the global shared timestamp
+    time_t getGlobalTimestamp();
+
+private:
+    QSharedMemory globalMemory;
+    uint64_t globalId;
+    QTimer ownerTimer;
+    QVector<IPCEventHandler> eventHandlers;
+    time_t lastSeenTimestamp;
+
+    // Constants
+    static const int MEMORY_SIZE = 4096;
+    static const int MEMORY_HEADER_SIZE = sizeof(globalId) + sizeof(time_t);
+    static const int EVENT_TIMER_MS = 1000;
+    static const int OWNERSHIP_TIMEOUT_S = 5;
+};
+
+#endif // IPC_H

src/main.cpp

@@ -16,6 +16,8 @@
 
 #include "widget/widget.h"
 #include "misc/settings.h"
+#include "src/ipc.h"
+#include "src/widget/toxuri.h"
 #include <QApplication>
 #include <QFontDatabase>
 #include <QDebug>
@@ -77,8 +79,35 @@ int main(int argc, char *argv[])
     // Install Unicode 6.1 supporting font
     QFontDatabase::addApplicationFont("://DejaVuSans.ttf");
 
-    Widget* w = Widget::getInstance();
+    // Inter-process communication
+    IPC ipc;
+    ipc.registerEventHandler(&toxURIEventHandler);
 
+    // Process arguments
+    if (argc >= 2)
+    {
+        QString firstParam(argv[1]);
+        // Tox URIs. If there's already another qTox instance running, we ask it to handle the URI and we exit
+        // Otherwise we start a new qTox instance and process it ourselves
+        if (firstParam.startsWith("tox:"))
+        {
+            if (ipc.isCurrentOwner()) // Don't bother sending an event if we're going to process it ourselves
+            {
+                handleToxURI(firstParam.toUtf8());
+            }
+            else
+            {
+                time_t event = ipc.postEvent(firstParam.toUtf8());
+                ipc.waitUntilProcessed(event);
+                // If someone else processed it, we're done here, no need to actually start qTox
+                if (!ipc.isCurrentOwner())
+                    return EXIT_SUCCESS;
+            }
+        }
+    }
+
+    // Run
+    Widget* w = Widget::getInstance();
     int errorcode = a.exec();
 
     delete w;

src/toxdns.cpp

@@ -0,0 +1,244 @@
+#include "src/toxdns.h"
+#include "src/misc/cdata.h"
+#include <QMessageBox>
+#include <QCoreApplication>
+#include <QThread>
+#include <QDebug>
+#include <tox/tox.h>
+#include <tox/toxdns.h>
+
+#define TOX_ID_LENGTH 2*TOX_FRIEND_ADDRESS_SIZE
+
+const ToxDNS::tox3_server ToxDNS::pinnedServers[]
+{
+    {"toxme.se", (uint8_t[32]){0x5D, 0x72, 0xC5, 0x17, 0xDF, 0x6A, 0xEC, 0x54, 0xF1, 0xE9, 0x77, 0xA6, 0xB6, 0xF2, 0x59, 0x14,
+                0xEA, 0x4C, 0xF7, 0x27, 0x7A, 0x85, 0x02, 0x7C, 0xD9, 0xF5, 0x19, 0x6D, 0xF1, 0x7E, 0x0B, 0x13}},
+    {"utox.org", (uint8_t[32]){0xD3, 0x15, 0x4F, 0x65, 0xD2, 0x8A, 0x5B, 0x41, 0xA0, 0x5D, 0x4A, 0xC7, 0xE4, 0xB3, 0x9C, 0x6B,
+                  0x1C, 0x23, 0x3C, 0xC8, 0x57, 0xFB, 0x36, 0x5C, 0x56, 0xE8, 0x39, 0x27, 0x37, 0x46, 0x2A, 0x12}}
+};
+
+void ToxDNS::showWarning(const QString &message)
+{
+    QMessageBox warning;
+    warning.setWindowTitle("Tox");
+    warning.setText(message);
+    warning.setIcon(QMessageBox::Warning);
+    warning.exec();
+}
+
+QByteArray ToxDNS::fetchLastTextRecord(const QString& record, bool silent)
+{
+    QByteArray result;
+
+    QDnsLookup dns;
+    dns.setType(QDnsLookup::TXT);
+    dns.setName(record);
+    dns.lookup();
+
+    int timeout;
+    for (timeout = 0; timeout<30 && !dns.isFinished(); ++timeout)
+    {
+        qApp->processEvents();
+        QThread::msleep(100);
+    }
+    if (timeout >= 30) {
+        dns.abort();
+        if (!silent)
+            showWarning(tr("The connection timed out","The DNS gives the Tox ID associated to toxme.se addresses"));
+        return result;
+    }
+
+    if (dns.error() == QDnsLookup::NotFoundError) {
+        if (!silent)
+            showWarning(tr("This address does not exist","The DNS gives the Tox ID associated to toxme.se addresses"));
+        return result;
+    }
+    else if (dns.error() != QDnsLookup::NoError) {
+        if (!silent)
+            showWarning(tr("Error while looking up DNS","The DNS gives the Tox ID associated to toxme.se addresses"));
+        return result;
+    }
+
+    const QList<QDnsTextRecord> textRecords = dns.textRecords();
+    if (textRecords.isEmpty()) {
+        if (!silent)
+            showWarning(tr("No text record found", "Error with the DNS"));
+        return result;
+    }
+
+    const QList<QByteArray> textRecordValues = textRecords.last().values();
+    if (textRecordValues.length() != 1) {
+        if (!silent)
+            showWarning(tr("Unexpected number of values in text record", "Error with the DNS"));
+        return result;
+    }
+
+    result = textRecordValues.first();
+    return result;
+}
+
+QString ToxDNS::queryTox1(const QString& record, bool silent)
+{
+    QString realRecord = record, toxId;
+    realRecord.replace("@", "._tox.");
+    const QString entry = fetchLastTextRecord(realRecord, silent);
+    if (entry.isEmpty())
+        return toxId;
+
+    // Check toxdns protocol version
+    int verx = entry.indexOf("v=");
+    if (verx) {
+        verx += 2;
+        int verend = entry.indexOf(';', verx);
+        if (verend)
+        {
+            QString ver = entry.mid(verx, verend-verx);
+            if (ver != "tox1")
+            {
+                if (!silent)
+                    showWarning(tr("The version of Tox DNS used by this server is not supported", "Error with the DNS"));
+                return toxId;
+            }
+        }
+    }
+
+    // Get the tox id
+    int idx = entry.indexOf("id=");
+    if (idx < 0) {
+        if (!silent)
+            showWarning(tr("The DNS lookup does not contain any Tox ID", "Error with the DNS"));
+        return toxId;
+    }
+
+    idx += 3;
+    if (entry.length() < idx + static_cast<int>(TOX_ID_LENGTH)) {
+        if (!silent)
+            showWarning(tr("The DNS lookup does not contain a valid Tox ID", "Error with the DNS"));
+        return toxId;
+    }
+
+    toxId = entry.mid(idx, TOX_ID_LENGTH);
+    if (!ToxID::isToxId(toxId)) {
+        if (!silent)
+            showWarning(tr("The DNS lookup does not contain a valid Tox ID", "Error with the DNS"));
+        return toxId;
+    }
+
+    return toxId;
+}
+
+QString ToxDNS::queryTox3(const tox3_server& server, const QString &record, bool silent)
+{
+    QByteArray nameData = record.left(record.indexOf('@')).toUtf8(), id, realRecord;
+    QString entry, toxIdStr;
+    int toxIdSize, idx, verx, dns_string_len;
+    const int dns_string_maxlen = 128;
+
+    void* tox_dns3 = tox_dns3_new(server.pubkey);
+    if (!tox_dns3)
+    {
+        qWarning() << "queryTox3: failed to create a tox_dns3 object for "<<server.name<<", using tox1 as a fallback";
+        goto fallbackOnTox1;
+    }
+    uint32_t request_id;
+    uint8_t dns_string[dns_string_maxlen];
+    dns_string_len = tox_generate_dns3_string(tox_dns3, dns_string, dns_string_maxlen, &request_id,
+                             (uint8_t*)nameData.data(), nameData.size());
+
+    if (dns_string_len < 0) // We can always fallback on tox1 if toxdns3 fails
+    {
+        qWarning() << "queryTox3: failed to generate dns3 string for "<<server.name<<", using tox1 as a fallback";
+        goto fallbackOnTox1;
+    }
+
+    realRecord = '_'+QByteArray((char*)dns_string, dns_string_len)+"._tox."+server.name;
+    entry = fetchLastTextRecord(realRecord, silent);
+    if (entry.isEmpty())
+    {
+        qWarning() << "queryTox3: Server "<<server.name<<" returned no record, using tox1 as a fallback";
+        goto fallbackOnTox1;
+    }
+
+    // Check toxdns protocol version
+    verx = entry.indexOf("v=");
+    if (verx!=-1) {
+        verx += 2;
+        int verend = entry.indexOf(';', verx);
+        if (verend!=-1)
+        {
+            QString ver = entry.mid(verx, verend-verx);
+            if (ver != "tox3")
+            {
+                qWarning() << "queryTox3: Server "<<server.name<<" returned a bad version ("<<ver<<"), using tox1 as a fallback";
+                goto fallbackOnTox1;
+            }
+        }
+    }
+
+    // Get and decrypt the tox id
+    idx = entry.indexOf("id=");
+    if (idx < 0) {
+        qWarning() << "queryTox3: Server "<<server.name<<" returned an empty id, using tox1 as a fallback";
+        goto fallbackOnTox1;
+    }
+
+    idx += 3;
+    id = entry.mid(idx).toUtf8();
+    uint8_t toxId[TOX_FRIEND_ADDRESS_SIZE];
+    toxIdSize = tox_decrypt_dns3_TXT(tox_dns3, toxId, (uint8_t*)id.data(), id.size(), request_id);
+    if (toxIdSize < 0) // We can always fallback on tox1 if toxdns3 fails
+    {
+        qWarning() << "queryTox3: failed to decrypt dns3 reply for "<<server.name<<", using tox1 as a fallback";
+        goto fallbackOnTox1;
+    }
+
+    tox_dns3_kill(tox_dns3);
+    toxIdStr = CFriendAddress::toString(toxId);
+    return toxIdStr;
+
+    // Centralized error handling, fallback on tox1 queries
+fallbackOnTox1:
+    if (tox_dns3)
+        tox_dns3_kill(tox_dns3);
+    queryTox1(record, silent);
+    return toxIdStr;
+}
+
+ToxID ToxDNS::resolveToxAddress(const QString &address, bool silent)
+{
+    ToxID toxId;
+
+    if (address.isEmpty()) {
+        return toxId;
+    } else if (ToxID::isToxId(address)) {
+        toxId = ToxID::fromString(address);
+        return toxId;
+    } else {
+        // If we're querying one of our pinned server, do a tox3 request directly
+        QString servname = address.mid(address.indexOf('@')+1);
+        for (const ToxDNS::tox3_server& pin : ToxDNS::pinnedServers)
+        {
+            if (servname == pin.name)
+            {
+                toxId = ToxID::fromString(queryTox3(pin, address, silent));
+                return toxId;
+            }
+        }
+
+        // Otherwise try tox3 if we can get a pubkey or fallback to tox1
+        QByteArray pubkey = fetchLastTextRecord("_tox."+servname, true);
+        if (!pubkey.isEmpty())
+        {
+            QByteArray servnameData = servname.toUtf8();
+            ToxDNS::tox3_server server;
+            server.name = servnameData.data();
+            server.pubkey = (uint8_t*)pubkey.data();
+            toxId = ToxID::fromString(queryTox3(server, address, silent));
+        }
+        else
+        {
+            toxId = ToxID::fromString(queryTox1(address, silent));
+        }
+        return toxId;
+    }
+}

src/toxdns.h

@@ -0,0 +1,42 @@
+#ifndef QTOXDNS_H
+#define QTOXDNS_H
+
+#include "src/corestructs.h"
+#include <QDnsLookup>
+#include <QObject>
+
+/// Handles tox1 and tox3 DNS queries
+class ToxDNS : public QObject
+{
+public:
+    struct tox3_server ///< Represents a tox3 server
+    {
+        tox3_server()=default;
+        tox3_server(const char* _name, uint8_t _pk[32]):name{_name},pubkey{_pk}{}
+
+        const char* name; ///< Hostname of the server, e.g. toxme.se
+        uint8_t* pubkey; ///< Public key of the tox3 server, usually 256bit long
+    };
+
+public:
+    /// Tries to map a text string to a ToxID struct, will query Tox DNS records if necessary
+    static ToxID resolveToxAddress(const QString& address, bool silent=true);
+
+    static QString queryTox1(const QString& record, bool silent=true); ///< Record should look like user@domain.tld
+    static QString queryTox3(const tox3_server& server, const QString& record, bool silent=true); ///< Record should look like user@domain.tld, may fallback on queryTox1
+
+protected:
+    static void showWarning(const QString& message);
+    ToxDNS()=default;
+
+private:
+    /// Try to fetch the first entry of the given TXT record
+    /// Returns an empty object on failure. May block for up to ~3s
+    /// May display message boxes on error if silent if false
+    static QByteArray fetchLastTextRecord(const QString& record, bool silent=true);
+
+public:
+    static const tox3_server pinnedServers[2];
+};
+
+#endif // QTOXDNS_H

src/widget/form/addfriendform.cpp

@@ -18,29 +18,14 @@
 
 #include <QFont>
 #include <QMessageBox>
-#include <QThread>
 #include <tox/tox.h>
 #include "ui_mainwindow.h"
 #include "src/core.h"
 #include "src/misc/cdata.h"
-#include "tox/toxdns.h"
+#include "src/toxdns.h"
 
-#include <QDebug>
-
-#define TOX_ID_LENGTH 2*TOX_FRIEND_ADDRESS_SIZE
-
-const AddFriendForm::tox3_server AddFriendForm::pinnedServers[]
+AddFriendForm::AddFriendForm()
 {
-    {"toxme.se", (uint8_t[32]){0x5D, 0x72, 0xC5, 0x17, 0xDF, 0x6A, 0xEC, 0x54, 0xF1, 0xE9, 0x77, 0xA6, 0xB6, 0xF2, 0x59, 0x14,
-                0xEA, 0x4C, 0xF7, 0x27, 0x7A, 0x85, 0x02, 0x7C, 0xD9, 0xF5, 0x19, 0x6D, 0xF1, 0x7E, 0x0B, 0x13}},
-    {"utox.org", (uint8_t[32]){0xD3, 0x15, 0x4F, 0x65, 0xD2, 0x8A, 0x5B, 0x41, 0xA0, 0x5D, 0x4A, 0xC7, 0xE4, 0xB3, 0x9C, 0x6B,
-                  0x1C, 0x23, 0x3C, 0xC8, 0x57, 0xFB, 0x36, 0x5C, 0x56, 0xE8, 0x39, 0x27, 0x37, 0x46, 0x2A, 0x12}}
-};
-
-AddFriendForm::AddFriendForm() : dns(this)
-{
-    dns.setType(QDnsLookup::TXT);
-
     main = new QWidget(), head = new QWidget();
     QFont bold;
     bold.setBold(true);
@@ -79,10 +64,10 @@ void AddFriendForm::show(Ui::MainWindow &ui)
     head->show();
 }
 
-bool AddFriendForm::isToxId(const QString &value) const
+QString AddFriendForm::getMessage() const
 {
-    const QRegularExpression hexRegExp("^[A-Fa-f0-9]+$");
-    return value.length() == TOX_ID_LENGTH && value.contains(hexRegExp);
+    const QString msg = message.toPlainText();
+    return !msg.isEmpty() ? msg : message.placeholderText();
 }
 
 void AddFriendForm::showWarning(const QString &message) const
@@ -94,19 +79,13 @@ void AddFriendForm::showWarning(const QString &message) const
     warning.exec();
 }
 
-QString AddFriendForm::getMessage() const
-{
-    const QString msg = message.toPlainText();
-    return !msg.isEmpty() ? msg : message.placeholderText();
-}
-
 void AddFriendForm::onSendTriggered()
 {
     QString id = toxId.text().trimmed();
 
     if (id.isEmpty()) {
         showWarning(tr("Please fill in a valid Tox ID","Tox ID of the friend you're sending a friend request to"));
-    } else if (isToxId(id)) {
+    } else if (ToxID::isToxId(id)) {
         if (id.toUpper() == Core::getInstance()->getSelfId().toString().toUpper())
             showWarning(tr("You can't add yourself as a friend!","When trying to add your own Tox ID as friend"));
         else
@@ -114,208 +93,16 @@ void AddFriendForm::onSendTriggered()
         this->toxId.clear();
         this->message.clear();
     } else {
-        // If we're querying one of our pinned server, do a tox3 request directly
-        QString servname = id.mid(id.indexOf('@')+1);
-        for (const AddFriendForm::tox3_server& pin : pinnedServers)
+        ToxID toxId = ToxDNS::resolveToxAddress(id, true);
+
+        if (toxId.toString().isEmpty())
         {
-            if (servname == pin.name)
-            {
-                queryTox3(pin, id);
-                return;
-            }
-        }
-
-        // Otherwise try tox3 if we can get a pubkey or fallback to tox1
-        QByteArray pubkey = fetchLastTextRecord("_tox."+servname);
-        if (!pubkey.isEmpty())
-        {
-            QByteArray servnameData = servname.toUtf8();
-            AddFriendForm::tox3_server server;
-            server.name = servnameData.data();
-            server.pubkey = (uint8_t*)pubkey.data();
-            queryTox3(server, id);
-        }
-        else
-        {
-            queryTox1(id);
-        }
-    }
-}
-
-QByteArray AddFriendForm::fetchLastTextRecord(const QString& record, bool silent)
-{
-    QByteArray result;
-
-    dns.setName(record);
-    dns.lookup();
-
-    int timeout;
-    for (timeout = 0; timeout<30 && !dns.isFinished(); ++timeout)
-    {
-        qApp->processEvents();
-        QThread::msleep(100);
-    }
-    if (timeout >= 30) {
-        dns.abort();
-        if (!silent)
-            showWarning(tr("The connection timed out","The DNS gives the Tox ID associated to toxme.se addresses"));
-        return result;
-    }
-
-    if (dns.error() == QDnsLookup::NotFoundError) {
-        if (!silent)
-            showWarning(tr("This address does not exist","The DNS gives the Tox ID associated to toxme.se addresses"));
-        return result;
-    }
-    else if (dns.error() != QDnsLookup::NoError) {
-        if (!silent)
-            showWarning(tr("Error while looking up DNS","The DNS gives the Tox ID associated to toxme.se addresses"));
-        return result;
-    }
-
-    const QList<QDnsTextRecord> textRecords = dns.textRecords();
-    if (textRecords.isEmpty()) {
-        if (!silent)
-            showWarning(tr("No text record found", "Error with the DNS"));
-        return result;
-    }
-
-    const QList<QByteArray> textRecordValues = textRecords.last().values();
-    if (textRecordValues.length() != 1) {
-        if (!silent)
-            showWarning(tr("Unexpected number of values in text record", "Error with the DNS"));
-        return result;
-    }
-
-    result = textRecordValues.first();
-    return result;
-}
-
-void AddFriendForm::queryTox1(const QString& record)
-{
-    QString realRecord = record;
-    realRecord.replace("@", "._tox.");
-    const QString entry = fetchLastTextRecord(realRecord, false);
-    if (entry.isEmpty())
-        return;
-
-    // Check toxdns protocol version
-    int verx = entry.indexOf("v=");
-    if (verx) {
-        verx += 2;
-        int verend = entry.indexOf(';', verx);
-        if (verend)
-        {
-            QString ver = entry.mid(verx, verend-verx);
-            if (ver != "tox1")
-            {
-                showWarning(tr("The version of Tox DNS used by this server is not supported", "Error with the DNS"));
-                return;
-            }
-        }
-    }
-
-    // Get the tox id
-    int idx = entry.indexOf("id=");
-    if (idx < 0) {
-        showWarning(tr("The DNS lookup does not contain any Tox ID", "Error with the DNS"));
+            showWarning(tr("This Tox ID does not exist","DNS error"));
             return;
         }
 
-    idx += 3;
-    if (entry.length() < idx + static_cast<int>(TOX_ID_LENGTH)) {
-        showWarning(tr("The DNS lookup does not contain a valid Tox ID", "Error with the DNS"));
-        return;
-    }
-
-    const QString friendAdress = entry.mid(idx, TOX_ID_LENGTH);
-    if (!isToxId(friendAdress)) {
-        showWarning(tr("The DNS lookup does not contain a valid Tox ID", "Error with the DNS"));
-        return;
-    }
-
-    // finally we got it
-    emit friendRequested(friendAdress, getMessage());
+        emit friendRequested(toxId.toString(), getMessage());
         this->toxId.clear();
         this->message.clear();
-}
-
-void AddFriendForm::queryTox3(const tox3_server& server, QString &record)
-{
-    QByteArray nameData = record.left(record.indexOf('@')).toUtf8(), id, realRecord;
-    QString entry, toxIdStr;
-    int toxIdSize, idx, verx, dns_string_len;
-    const int dns_string_maxlen = 128;
-
-    void* tox_dns3 = tox_dns3_new(server.pubkey);
-    if (!tox_dns3)
-    {
-        qWarning() << "queryTox3: failed to create a tox_dns3 object for "<<server.name<<", using tox1 as a fallback";
-        goto fallbackOnTox1;
-    }
-    uint32_t request_id;
-    uint8_t dns_string[dns_string_maxlen];
-    dns_string_len = tox_generate_dns3_string(tox_dns3, dns_string, dns_string_maxlen, &request_id,
-                             (uint8_t*)nameData.data(), nameData.size());
-
-    if (dns_string_len < 0) // We can always fallback on tox1 if toxdns3 fails
-    {
-        qWarning() << "queryTox3: failed to generate dns3 string for "<<server.name<<", using tox1 as a fallback";
-        goto fallbackOnTox1;
-    }
-
-    realRecord = '_'+QByteArray((char*)dns_string, dns_string_len)+"._tox."+server.name;
-    entry = fetchLastTextRecord(realRecord, false);
-    if (entry.isEmpty())
-    {
-        qWarning() << "queryTox3: Server "<<server.name<<" returned no record, using tox1 as a fallback";
-        goto fallbackOnTox1;
-    }
-
-    // Check toxdns protocol version
-    verx = entry.indexOf("v=");
-    if (verx!=-1) {
-        verx += 2;
-        int verend = entry.indexOf(';', verx);
-        if (verend!=-1)
-        {
-            QString ver = entry.mid(verx, verend-verx);
-            if (ver != "tox3")
-            {
-                qWarning() << "queryTox3: Server "<<server.name<<" returned a bad version ("<<ver<<"), using tox1 as a fallback";
-                goto fallbackOnTox1;
-            }
-        }
-    }
-
-    // Get and decrypt the tox id
-    idx = entry.indexOf("id=");
-    if (idx < 0) {
-        qWarning() << "queryTox3: Server "<<server.name<<" returned an empty id, using tox1 as a fallback";
-        goto fallbackOnTox1;
-    }
-
-    idx += 3;
-    id = entry.mid(idx).toUtf8();
-    uint8_t toxId[TOX_FRIEND_ADDRESS_SIZE];
-    toxIdSize = tox_decrypt_dns3_TXT(tox_dns3, toxId, (uint8_t*)id.data(), id.size(), request_id);
-    if (toxIdSize < 0) // We can always fallback on tox1 if toxdns3 fails
-    {
-        qWarning() << "queryTox3: failed to decrypt dns3 reply for "<<server.name<<", using tox1 as a fallback";
-        goto fallbackOnTox1;
-    }
-
-    tox_dns3_kill(tox_dns3);
-    toxIdStr = CFriendAddress::toString(toxId);
-    emit friendRequested(toxIdStr, getMessage());
-    this->toxId.clear();
-    this->message.clear();
-    return;
-
-    // Centralized error handling, fallback on tox1 queries
-fallbackOnTox1:
-    if (tox_dns3)
-        tox_dns3_kill(tox_dns3);
-    queryTox1(record);
-    return;
+    }
 }

src/widget/form/addfriendform.h

@@ -22,7 +22,6 @@
 #include <QLineEdit>
 #include <QTextEdit>
 #include <QPushButton>
-#include <QDnsLookup>
 
 namespace Ui {class MainWindow;}
 
@@ -34,34 +33,17 @@ public:
     ~AddFriendForm();
 
     void show(Ui::MainWindow &ui);
-    bool isToxId(const QString& value) const;
-    void showWarning(const QString& message) const;
     QString getMessage() const;
 
 signals:
     void friendRequested(const QString& friendAddress, const QString& message);
 
+protected:
+    void showWarning(const QString& message) const;
+
 private slots:
     void onSendTriggered();
 
-private:
-    struct tox3_server
-    {
-        tox3_server()=default;
-        tox3_server(const char* _name, uint8_t _pk[32]):name{_name},pubkey{_pk}{}
-
-        const char* name; ///< Hostname of the server, e.g. toxme.se
-        uint8_t* pubkey; ///< Public key of the tox3 server, usually 256bit long
-    };
-
-private:
-    void queryTox1(const QString& record); ///< Record should look like user@domain.tld
-    void queryTox3(const tox3_server& server, QString& record); ///< Record should look like user@domain.tld, may fallback on queryTox1
-    /// Try to fetch the first entry of the given TXT record
-    /// Returns an empty object on failure. May block for up to ~3s
-    /// May display message boxes on error if silent if false
-    QByteArray fetchLastTextRecord(const QString& record, bool silent=true);
-
 private:
     QLabel headLabel, toxIdLabel, messageLabel;
     QPushButton sendButton;
@@ -69,10 +51,6 @@ private:
     QTextEdit message;
     QVBoxLayout layout, headLayout;
     QWidget *head, *main;
-
-    /** will be used for dns discovery if necessary */
-    QDnsLookup dns;
-    static const tox3_server pinnedServers[];
 };
 
 #endif // ADDFRIENDFORM_H

src/widget/toxuri.cpp

@@ -0,0 +1,92 @@
+#include "src/widget/toxuri.h"
+#include "src/toxdns.h"
+#include "src/widget/tool/friendrequestdialog.h"
+#include "src/core.h"
+#include <QByteArray>
+#include <QString>
+#include <QMessageBox>
+#include <QVBoxLayout>
+#include <QDialogButtonBox>
+#include <QLabel>
+#include <QLineEdit>
+#include <QPlainTextEdit>
+#include <QPushButton>
+#include <QCoreApplication>
+
+void toxURIEventHandler(const QByteArray& eventData)
+{
+    if (!eventData.startsWith("tox:"))
+        return;
+
+    handleToxURI(eventData);
+}
+
+void handleToxURI(const QString &toxURI)
+{
+    Core* core = Core::getInstance();
+
+    while (!core)
+    {
+        core = Core::getInstance();
+        qApp->processEvents();
+    }
+
+    while (!core->isReady())
+    {
+        qApp->processEvents();
+    }
+
+    QString toxaddr = toxURI.mid(4);
+    QString toxid = ToxDNS::resolveToxAddress(toxaddr, true).toString();
+
+    if (toxid.isEmpty())
+    {
+        QMessageBox::warning(0, "qTox", toxaddr+" is not a valid Tox address.");
+    }
+    else
+    {
+        ToxURIDialog dialog(0, toxaddr, QObject::tr("Tox me maybe?","Default message in Tox URI friend requests. Write something appropriate!"));
+        if (dialog.exec() == QDialog::Accepted)
+            Core::getInstance()->requestFriendship(toxid, dialog.getRequestMessage());
+    }
+}
+
+ToxURIDialog::ToxURIDialog(QWidget *parent, const QString &userId, const QString &message) :
+    QDialog(parent)
+{
+    setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint);
+    setWindowTitle(tr("Add a friend","Title of the window to add a friend through Tox URI"));
+
+    QLabel *friendsLabel = new QLabel(tr("Do you want to add %1 as a friend ?").arg(userId), this);
+    QLabel *userIdLabel = new QLabel(tr("User ID:"), this);
+    QLineEdit *userIdEdit = new QLineEdit(userId, this);
+    userIdEdit->setCursorPosition(0);
+    userIdEdit->setReadOnly(true);
+    QLabel *messageLabel = new QLabel(tr("Friend request message:"), this);
+    messageEdit = new QPlainTextEdit(message, this);
+
+    QDialogButtonBox *buttonBox = new QDialogButtonBox(Qt::Horizontal, this);
+
+    buttonBox->addButton(tr("Send","Send a friend request"), QDialogButtonBox::AcceptRole);
+    buttonBox->addButton(tr("Cancel","Don't send a friend request"), QDialogButtonBox::RejectRole);
+
+    connect(buttonBox, &QDialogButtonBox::accepted, this, &FriendRequestDialog::accept);
+    connect(buttonBox, &QDialogButtonBox::rejected, this, &FriendRequestDialog::reject);
+
+    QVBoxLayout *layout = new QVBoxLayout(this);
+
+    layout->addWidget(friendsLabel);
+    layout->addSpacing(12);
+    layout->addWidget(userIdLabel);
+    layout->addWidget(userIdEdit);
+    layout->addWidget(messageLabel);
+    layout->addWidget(messageEdit);
+    layout->addWidget(buttonBox);
+
+    resize(300, 200);
+}
+
+QString ToxURIDialog::getRequestMessage()
+{
+    return messageEdit->toPlainText();
+}

src/widget/toxuri.h

@@ -0,0 +1,25 @@
+#ifndef TOXURI_H
+#define TOXURI_H
+
+#include <QDialog>
+
+/// Shows a dialog asking whether or not to add this tox address as a friend
+/// Will wait until the core is ready first
+void handleToxURI(const QString& toxURI);
+
+// Internals
+class QByteArray;
+class QPlainTextEdit;
+void toxURIEventHandler(const QByteArray& eventData);
+class ToxURIDialog : public QDialog
+{
+    Q_OBJECT
+public:
+    explicit ToxURIDialog(QWidget *parent, const QString &userId, const QString &message);
+    QString getRequestMessage();
+
+private:
+    QPlainTextEdit *messageEdit;
+};
+
+#endif // TOXURI_H

src/widget/widget.cpp

@@ -62,7 +62,6 @@ Widget::Widget(QWidget *parent)
 
 void Widget::init()
 {
-    
     ui->setupUi(this);
     
     if (QSystemTrayIcon::isSystemTrayAvailable() == true)