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diff --git a/src/adbd-client.h b/src/adbd-client.h
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+/*
+ * Copyright 2016 Canonical Ltd.
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 3, as published
+ * by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranties of
+ * MERCHANTABILITY, SATISFACTORY QUALITY, or FITNESS FOR A PARTICULAR
+ * PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *   Charles Kerr <charles.kerr@canonical.com>
+ */
+
+#pragma once
+
+#include <functional>
+#include <memory>
+#include <string>
+
+#include <core/signal.h>
+
+/**
+ * Receives public key requests from ADBD and sends a response back.
+ *
+ * AdbClient only provides a receive/respond mechanism. The decision
+ * of what response gets sent is delegated out to a listener via
+ * the on_pk_request signal.
+ *
+ * The decider should connect to on_pk_request, listen for PKRequests,
+ * and call the request's `respond' method with the desired response.
+ */
+class AdbdClient
+{
+public:
+    virtual ~AdbdClient();
+
+    enum class PKResponse { DENY, ALLOW };
+
+    struct PKRequest {
+        std::string public_key;
+        std::function<void(PKResponse)> respond;
+    };
+
+    virtual core::Signal<const PKRequest&>& on_pk_request() =0;
+
+protected:
+    AdbdClient() =default;
+};
+
+/**
+ * An AdbdClient designed to work with GLib's event loop.
+ *
+ * The on_pk_request() signal will be called in global GMainContext's thread;
+ * ie, just like a function passed to g_idle_add() or g_timeout_add().
+ */
+class GAdbdClient: public AdbdClient
+{
+public:
+    explicit GAdbdClient(const std::string& socket_path);
+    ~GAdbdClient();
+    core::Signal<const PKRequest&>& on_pk_request() override;
+
+private:
+    class Impl;
+    std::unique_ptr<Impl> impl;
+};
+