diff --git a/src/dialogs/UserProfile.cpp b/src/dialogs/UserProfile.cpp
new file mode 100644
index 00000000..086dbb40
--- /dev/null
+++ b/src/dialogs/UserProfile.cpp
@@ -0,0 +1,316 @@
+#include <QHBoxLayout>
+#include <QLabel>
+#include <QListWidget>
+#include <QMessageBox>
+#include <QShortcut>
+#include <QVBoxLayout>
+
+#include "Cache.h"
+#include "ChatPage.h"
+#include "Logging.h"
+#include "MatrixClient.h"
+#include "Utils.h"
+#include "dialogs/UserProfile.h"
+#include "ui/Avatar.h"
+#include "ui/FlatButton.h"
+
+using namespace dialogs;
+
+Q_DECLARE_METATYPE(std::vector<DeviceInfo>)
+
+constexpr int BUTTON_SIZE = 36;
+constexpr int BUTTON_RADIUS = BUTTON_SIZE / 2;
+constexpr int WIDGET_MARGIN = 20;
+constexpr int TOP_WIDGET_MARGIN = 2 * WIDGET_MARGIN;
+constexpr int WIDGET_SPACING = 15;
+constexpr int TEXT_SPACING = 4;
+constexpr int DEVICE_SPACING = 5;
+
+DeviceItem::DeviceItem(DeviceInfo device, QWidget *parent)
+ : QWidget(parent)
+ , info_(std::move(device))
+{
+ QFont font;
+ font.setBold(true);
+
+ auto deviceIdLabel = new QLabel(info_.device_id, this);
+ deviceIdLabel->setFont(font);
+
+ auto layout = new QVBoxLayout{this};
+ layout->addWidget(deviceIdLabel);
+
+ if (!info_.display_name.isEmpty())
+ layout->addWidget(new QLabel(info_.display_name, this));
+
+ layout->setMargin(0);
+ layout->setSpacing(4);
+}
+
+UserProfile::UserProfile(QWidget *parent)
+ : QWidget(parent)
+{
+ setAutoFillBackground(true);
+ setWindowFlags(Qt::Tool | Qt::WindowStaysOnTopHint);
+ setAttribute(Qt::WA_DeleteOnClose, true);
+
+ QIcon banIcon, kickIcon, ignoreIcon, startChatIcon;
+
+ banIcon.addFile(":/icons/icons/ui/do-not-disturb-rounded-sign.png");
+ banBtn_ = new FlatButton(this);
+ banBtn_->setFixedSize(BUTTON_SIZE, BUTTON_SIZE);
+ banBtn_->setCornerRadius(BUTTON_RADIUS);
+ banBtn_->setIcon(banIcon);
+ banBtn_->setIconSize(QSize(BUTTON_RADIUS, BUTTON_RADIUS));
+ banBtn_->setToolTip(tr("Ban the user from the room"));
+
+ ignoreIcon.addFile(":/icons/icons/ui/volume-off-indicator.png");
+ ignoreBtn_ = new FlatButton(this);
+ ignoreBtn_->setFixedSize(BUTTON_SIZE, BUTTON_SIZE);
+ ignoreBtn_->setCornerRadius(BUTTON_RADIUS);
+ ignoreBtn_->setIcon(ignoreIcon);
+ ignoreBtn_->setIconSize(QSize(BUTTON_RADIUS, BUTTON_RADIUS));
+ ignoreBtn_->setToolTip(tr("Ignore messages from this user"));
+ ignoreBtn_->setDisabled(true); // Not used yet.
+
+ kickIcon.addFile(":/icons/icons/ui/round-remove-button.png");
+ kickBtn_ = new FlatButton(this);
+ kickBtn_->setFixedSize(BUTTON_SIZE, BUTTON_SIZE);
+ kickBtn_->setCornerRadius(BUTTON_RADIUS);
+ kickBtn_->setIcon(kickIcon);
+ kickBtn_->setIconSize(QSize(BUTTON_RADIUS, BUTTON_RADIUS));
+ kickBtn_->setToolTip(tr("Kick the user from the room"));
+
+ startChatIcon.addFile(":/icons/icons/ui/black-bubble-speech.png");
+ startChat_ = new FlatButton(this);
+ startChat_->setFixedSize(BUTTON_SIZE, BUTTON_SIZE);
+ startChat_->setCornerRadius(BUTTON_RADIUS);
+ startChat_->setIcon(startChatIcon);
+ startChat_->setIconSize(QSize(BUTTON_RADIUS, BUTTON_RADIUS));
+ startChat_->setToolTip(tr("Start a conversation"));
+
+ connect(startChat_, &QPushButton::clicked, this, [this]() {
+ auto user_id = userIdLabel_->text();
+
+ mtx::requests::CreateRoom req;
+ req.preset = mtx::requests::Preset::PrivateChat;
+ req.visibility = mtx::requests::Visibility::Private;
+
+ if (utils::localUser() != user_id)
+ req.invite = {user_id.toStdString()};
+
+ if (QMessageBox::question(
+ this,
+ tr("Confirm DM"),
+ tr("Do you really want to invite %1 (%2) to a direct chat?")
+ .arg(cache::displayName(roomId_, user_id))
+ .arg(user_id)) != QMessageBox::Yes)
+ return;
+
+ emit ChatPage::instance()->createRoom(req);
+ });
+
+ connect(banBtn_, &QPushButton::clicked, this, [this] {
+ ChatPage::instance()->banUser(userIdLabel_->text(), "");
+ });
+ connect(kickBtn_, &QPushButton::clicked, this, [this] {
+ ChatPage::instance()->kickUser(userIdLabel_->text(), "");
+ });
+
+ // Button line
+ auto btnLayout = new QHBoxLayout;
+ btnLayout->addStretch(1);
+ btnLayout->addWidget(startChat_);
+ btnLayout->addWidget(ignoreBtn_);
+
+ btnLayout->addWidget(kickBtn_);
+ btnLayout->addWidget(banBtn_);
+ btnLayout->addStretch(1);
+ btnLayout->setSpacing(8);
+ btnLayout->setMargin(0);
+
+ avatar_ = new Avatar(this, 128);
+ avatar_->setLetter("X");
+
+ QFont font;
+ font.setPointSizeF(font.pointSizeF() * 2);
+
+ userIdLabel_ = new QLabel(this);
+ displayNameLabel_ = new QLabel(this);
+ displayNameLabel_->setFont(font);
+
+ auto textLayout = new QVBoxLayout;
+ textLayout->addWidget(displayNameLabel_);
+ textLayout->addWidget(userIdLabel_);
+ textLayout->setAlignment(displayNameLabel_, Qt::AlignCenter | Qt::AlignTop);
+ textLayout->setAlignment(userIdLabel_, Qt::AlignCenter | Qt::AlignTop);
+ textLayout->setSpacing(TEXT_SPACING);
+ textLayout->setMargin(0);
+
+ devices_ = new QListWidget{this};
+ devices_->setFrameStyle(QFrame::NoFrame);
+ devices_->setSelectionMode(QAbstractItemView::NoSelection);
+ devices_->setAttribute(Qt::WA_MacShowFocusRect, 0);
+ devices_->setSpacing(DEVICE_SPACING);
+
+ QFont descriptionLabelFont;
+ descriptionLabelFont.setWeight(65);
+
+ devicesLabel_ = new QLabel(tr("Devices").toUpper(), this);
+ devicesLabel_->setFont(descriptionLabelFont);
+ devicesLabel_->hide();
+ devicesLabel_->setFixedSize(devicesLabel_->sizeHint());
+
+ auto okBtn = new QPushButton("OK", this);
+
+ auto closeLayout = new QHBoxLayout();
+ closeLayout->setSpacing(15);
+ closeLayout->addStretch(1);
+ closeLayout->addWidget(okBtn);
+
+ auto vlayout = new QVBoxLayout{this};
+ vlayout->addWidget(avatar_, 0, Qt::AlignCenter | Qt::AlignTop);
+ vlayout->addLayout(textLayout);
+ vlayout->addLayout(btnLayout);
+ vlayout->addWidget(devicesLabel_, 0, Qt::AlignLeft);
+ vlayout->addWidget(devices_, 1);
+ vlayout->addLayout(closeLayout);
+
+ QFont largeFont;
+ largeFont.setPointSizeF(largeFont.pointSizeF() * 1.5);
+
+ setMinimumWidth(
+ std::max(devices_->sizeHint().width() + 4 * WIDGET_MARGIN, conf::window::minModalWidth));
+ setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Minimum);
+
+ vlayout->setSpacing(WIDGET_SPACING);
+ vlayout->setContentsMargins(WIDGET_MARGIN, TOP_WIDGET_MARGIN, WIDGET_MARGIN, WIDGET_MARGIN);
+
+ qRegisterMetaType<std::vector<DeviceInfo>>();
+
+ auto closeShortcut = new QShortcut(QKeySequence(QKeySequence::Cancel), this);
+ connect(closeShortcut, &QShortcut::activated, this, &UserProfile::close);
+ connect(okBtn, &QPushButton::clicked, this, &UserProfile::close);
+}
+
+void
+UserProfile::resetToDefaults()
+{
+ avatar_->setLetter("X");
+ devices_->clear();
+
+ ignoreBtn_->show();
+ devices_->hide();
+ devicesLabel_->hide();
+}
+
+void
+UserProfile::init(const QString &userId, const QString &roomId)
+{
+ resetToDefaults();
+
+ this->roomId_ = roomId;
+
+ auto displayName = cache::displayName(roomId, userId);
+
+ userIdLabel_->setText(userId);
+ displayNameLabel_->setText(displayName);
+ avatar_->setLetter(utils::firstChar(displayName));
+
+ avatar_->setImage(roomId, userId);
+
+ auto localUser = utils::localUser();
+
+ try {
+ bool hasMemberRights =
+ cache::hasEnoughPowerLevel({mtx::events::EventType::RoomMember},
+ roomId.toStdString(),
+ localUser.toStdString());
+ if (!hasMemberRights) {
+ kickBtn_->hide();
+ banBtn_->hide();
+ } else {
+ kickBtn_->show();
+ banBtn_->show();
+ }
+ } catch (const lmdb::error &e) {
+ nhlog::db()->warn("lmdb error: {}", e.what());
+ }
+
+ if (localUser == userId) {
+ // TODO: click on display name & avatar to change.
+ kickBtn_->hide();
+ banBtn_->hide();
+ ignoreBtn_->hide();
+ }
+
+ mtx::requests::QueryKeys req;
+ req.device_keys[userId.toStdString()] = {};
+
+ // A proxy object is used to emit the signal instead of the original object
+ // which might be destroyed by the time the http call finishes.
+ auto proxy = std::make_shared<Proxy>();
+ QObject::connect(proxy.get(), &Proxy::done, this, &UserProfile::updateDeviceList);
+
+ http::client()->query_keys(
+ req,
+ [user_id = userId.toStdString(), proxy = std::move(proxy)](
+ const mtx::responses::QueryKeys &res, mtx::http::RequestErr err) {
+ if (err) {
+ nhlog::net()->warn("failed to query device keys: {} {}",
+ err->matrix_error.error,
+ static_cast<int>(err->status_code));
+ // TODO: Notify the UI.
+ return;
+ }
+
+ if (res.device_keys.empty() ||
+ (res.device_keys.find(user_id) == res.device_keys.end())) {
+ nhlog::net()->warn("no devices retrieved {}", user_id);
+ return;
+ }
+
+ auto devices = res.device_keys.at(user_id);
+
+ std::vector<DeviceInfo> deviceInfo;
+ for (const auto &d : devices) {
+ auto device = d.second;
+
+ // TODO: Verify signatures and ignore those that don't pass.
+ deviceInfo.emplace_back(DeviceInfo{
+ QString::fromStdString(d.first),
+ QString::fromStdString(device.unsigned_info.device_display_name)});
+ }
+
+ std::sort(deviceInfo.begin(),
+ deviceInfo.end(),
+ [](const DeviceInfo &a, const DeviceInfo &b) {
+ return a.device_id > b.device_id;
+ });
+
+ if (!deviceInfo.empty())
+ emit proxy->done(QString::fromStdString(user_id), deviceInfo);
+ });
+}
+
+void
+UserProfile::updateDeviceList(const QString &user_id, const std::vector<DeviceInfo> &devices)
+{
+ if (user_id != userIdLabel_->text())
+ return;
+
+ for (const auto &dev : devices) {
+ auto deviceItem = new DeviceItem(dev, this);
+ auto item = new QListWidgetItem;
+
+ item->setSizeHint(deviceItem->minimumSizeHint());
+ item->setFlags(Qt::NoItemFlags);
+ item->setTextAlignment(Qt::AlignCenter);
+
+ devices_->insertItem(devices_->count() - 1, item);
+ devices_->setItemWidget(item, deviceItem);
+ }
+
+ devicesLabel_->show();
+ devices_->show();
+ adjustSize();
+}
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