bmc: move Verification declaration out of single header

Split the interface declaration from the implementation declaration to
make it more obvious what would change to support more implementations.

Signed-off-by: Patrick Venture <venture@google.com>
Change-Id: I6452ad85513dad1431ef946b62936c1cea89c263
diff --git a/verify_systemd.hpp b/verify_systemd.hpp
new file mode 100644
index 0000000..60acbc6
--- /dev/null
+++ b/verify_systemd.hpp
@@ -0,0 +1,57 @@
+#pragma once
+
+#include "status.hpp"
+#include "verify.hpp"
+
+#include <memory>
+#include <sdbusplus/bus.hpp>
+#include <string>
+
+namespace blobs
+{
+
+/**
+ * Representation of what is used for verification.  Currently, this reduces the
+ * chance of error by using an object instead of two strings to control the
+ * verification step, however, it leaves room for a future possibility out
+ * something wholly configurable.
+ */
+class SystemdVerification : public VerificationInterface
+{
+  public:
+    /**
+     * Create a default Verification object that uses systemd to trigger the
+     * process.
+     *
+     * @param[in] bus - an sdbusplus handler for a bus to use.
+     * @param[in] path - the path to check for verification status.
+     * @param[in[ service - the systemd service to start to trigger
+     * verification.
+     */
+    static std::unique_ptr<VerificationInterface>
+        CreateVerification(sdbusplus::bus::bus&& bus, const std::string& path,
+                           const std::string& service);
+
+    SystemdVerification(sdbusplus::bus::bus&& bus, const std::string& path,
+                        const std::string& service) :
+        bus(std::move(bus)),
+        checkPath(path), triggerService(service)
+    {
+    }
+
+    ~SystemdVerification() = default;
+    SystemdVerification(const SystemdVerification&) = delete;
+    SystemdVerification& operator=(const SystemdVerification&) = delete;
+    SystemdVerification(SystemdVerification&&) = default;
+    SystemdVerification& operator=(SystemdVerification&&) = default;
+
+    bool triggerVerification() override;
+    void abortVerification() override;
+    VerifyCheckResponses checkVerificationState() override;
+
+  private:
+    sdbusplus::bus::bus bus;
+    const std::string checkPath;
+    const std::string triggerService;
+};
+} // namespace blobs