Implement DeleteUser/DeleteAllUsers

Bug: 160731903
Test: "atest VtsHalGatekeeperV1_0TargetTest"
      manual testing with added instrumentation
Change-Id: I79fab5910a344fdec0e7acf62839146e146ac922

2 files changed, 22 insertions, 3 deletions

diff --git a/gatekeeper.cpp b/gatekeeper.cpp
index 436ae81..57be100 100644
--- a/gatekeeper.cpp
+++ b/gatekeeper.cpp
@@ -163,13 +163,18 @@ void GateKeeper::Verify(const VerifyRequest &request, VerifyResponse *response)
     }
 }
 
-void GateKeeper::DeleteUser(const DeleteUserRequest &/*request*/, DeleteUserResponse *response) {
-    response->error = ERROR_NOT_IMPLEMENTED;
+void GateKeeper::DeleteUser(const DeleteUserRequest &request, DeleteUserResponse *response) {
+    if (response == nullptr) return;
+
+    uint32_t uid = request.user_id;
+    response->error = RemoveUser(uid);
 }
 
 void GateKeeper::DeleteAllUsers(const DeleteAllUsersRequest &/*request*/,
         DeleteAllUsersResponse *response) {
-    response->error = ERROR_NOT_IMPLEMENTED;
+    if (response == nullptr) return;
+
+    response->error = RemoveAllUsers();
 }
 
 bool GateKeeper::CreatePasswordHandle(SizedBuffer *password_handle_buffer, salt_t salt,
diff --git a/include/gatekeeper/gatekeeper.h b/include/gatekeeper/gatekeeper.h
index 9f70d6f..62f0b34 100644
--- a/include/gatekeeper/gatekeeper.h
+++ b/include/gatekeeper/gatekeeper.h
@@ -117,6 +117,20 @@ protected:
     virtual uint64_t GetMillisecondsSinceBoot() const = 0;
 
     /**
+     * Removes all records for the given user.
+     *
+     * Returns true if the user's records were successfully deleted.
+     */
+    virtual gatekeeper_error_t RemoveUser(uint32_t /* uid */) { return ERROR_NOT_IMPLEMENTED; }
+
+    /**
+     * Removes all records.
+     *
+     * Returns true if the records were successfully deleted.
+     */
+    virtual gatekeeper_error_t RemoveAllUsers() { return ERROR_NOT_IMPLEMENTED; }
+
+    /**
      * Returns the value of the current failure record for the user.
      *
      * The failure record should be written to hardware-backed secure storage, such as