Add activation, item_updater and version

Implement part of functions of Activation, ItemUpdater and Version.

Tested: Upload a dummy PSU tarball, and verify the activation object is
        created with expected ExtendedVersion, and the object is deleted
        when Delete is invoked.

Signed-off-by: Lei YU <mine260309@gmail.com>
Change-Id: I7b9d29f46914ace93d27a715b32c80957e88a0aa
diff --git a/src/version.hpp b/src/version.hpp
new file mode 100644
index 0000000..102d26a
--- /dev/null
+++ b/src/version.hpp
@@ -0,0 +1,154 @@
+#pragma once
+
+#include "config.h"
+
+#include <sdbusplus/bus.hpp>
+#include <xyz/openbmc_project/Common/FilePath/server.hpp>
+#include <xyz/openbmc_project/Object/Delete/server.hpp>
+#include <xyz/openbmc_project/Software/Version/server.hpp>
+
+namespace phosphor
+{
+namespace software
+{
+namespace updater
+{
+
+using eraseFunc = std::function<void(std::string)>;
+
+using VersionInherit = sdbusplus::server::object::object<
+    sdbusplus::xyz::openbmc_project::Software::server::Version,
+    sdbusplus::xyz::openbmc_project::Common::server::FilePath>;
+using DeleteInherit = sdbusplus::server::object::object<
+    sdbusplus::xyz::openbmc_project::Object::server::Delete>;
+
+namespace sdbusRule = sdbusplus::bus::match::rules;
+
+class Version;
+
+/** @class Delete
+ *  @brief OpenBMC Delete implementation.
+ *  @details A concrete implementation for xyz.openbmc_project.Object.Delete
+ *  D-Bus API.
+ */
+class Delete : public DeleteInherit
+{
+  public:
+    /** @brief Constructs Delete.
+     *
+     *  @param[in] bus    - The D-Bus bus object
+     *  @param[in] path   - The D-Bus object path
+     *  @param[in] version - The Version object.
+     */
+    Delete(sdbusplus::bus::bus& bus, const std::string& path,
+           Version& version) :
+        DeleteInherit(bus, path.c_str(), true),
+        version(version), bus(bus), path(path)
+    {
+        std::vector<std::string> interfaces({interface});
+        bus.emit_interfaces_added(path.c_str(), interfaces);
+    }
+
+    ~Delete()
+    {
+        std::vector<std::string> interfaces({interface});
+        bus.emit_interfaces_removed(path.c_str(), interfaces);
+    }
+
+    /**
+     * @brief Delete the D-Bus object.
+     *        Overrides the default delete function by calling
+     *        Version class erase Method.
+     **/
+    void delete_() override;
+
+  private:
+    /** @brief The Version Object. */
+    Version& version;
+
+    static constexpr auto interface = "xyz.openbmc_project.Object.Delete";
+    sdbusplus::bus::bus& bus;
+    std::string path;
+};
+
+/** @class Version
+ *  @brief OpenBMC version software management implementation.
+ *  @details A concrete implementation for xyz.openbmc_project.Software.Version
+ *  D-Bus API.
+ */
+class Version : public VersionInherit
+{
+  public:
+    /** @brief Constructs Version Software Manager.
+     *
+     * @param[in] bus            - The D-Bus bus object
+     * @param[in] objPath        - The D-Bus object path
+     * @param[in] versionId      - The version Id
+     * @param[in] versionString  - The version string
+     * @param[in] versionPurpose - The version purpose
+     * @param[in] filePath       - The image filesystem path
+     * @param[in] callback       - The eraseFunc callback
+     */
+    Version(sdbusplus::bus::bus& bus, const std::string& objPath,
+            const std::string& versionId, const std::string& versionString,
+            VersionPurpose versionPurpose, const std::string& filePath,
+            eraseFunc callback) :
+        VersionInherit(bus, (objPath).c_str(), true),
+        eraseCallback(callback), bus(bus), objPath(objPath),
+        versionId(versionId), versionStr(versionString)
+    {
+        // Set properties.
+        purpose(versionPurpose);
+        version(versionString);
+        path(filePath);
+
+        deleteObject = std::make_unique<Delete>(bus, objPath, *this);
+
+        // Emit deferred signal.
+        emit_object_added();
+    }
+
+    /**
+     * @brief Return the version id
+     */
+    std::string getVersionId() const
+    {
+        return versionId;
+    }
+
+    /**
+     * @brief Read the manifest file to get the value of the key.
+     *
+     * @param[in] filePath - The path to the file which contains the value
+     *                       of keys.
+     * @param[in] keys     - A map of keys with empty values.
+     *
+     * @return The map of keys with filled values.
+     **/
+    static std::map<std::string, std::string>
+        getValue(const std::string& filePath,
+                 std::map<std::string, std::string> keys);
+
+    /** @brief Persistent Delete D-Bus object */
+    std::unique_ptr<Delete> deleteObject;
+
+    /** @brief The temUpdater's erase callback. */
+    eraseFunc eraseCallback;
+
+  private:
+    /** @brief Persistent sdbusplus DBus bus connection */
+    sdbusplus::bus::bus& bus;
+
+    /** @brief Persistent DBus object path */
+    std::string objPath;
+
+    /** @brief This Version's version Id */
+    const std::string versionId;
+
+    /** @brief This Version's version string */
+    const std::string versionStr;
+};
+
+} // namespace updater
+} // namespace software
+} // namespace phosphor