feat: create MessageDigest when needed

executions/graphql-kotlin-automatic-persisted-queries/src/main/kotlin/com/expediagroup/graphql/apq/extensions/executionInputExtensions.kt

@@ -1,19 +1,3 @@
-/*
- * Copyright 2022 Expedia, Inc
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     https://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
 package com.expediagroup.graphql.apq.extensions
 
 import com.expediagroup.graphql.apq.provider.AutomaticPersistedQueriesExtension
@@ -23,7 +7,6 @@ import java.nio.charset.StandardCharsets
 import java.security.MessageDigest
 
 internal const val APQ_EXTENSION_KEY: String = "persistedQuery"
-internal val MESSAGE_DIGEST: MessageDigest = MessageDigest.getInstance("SHA-256")
 
 @Suppress("UNCHECKED_CAST")
 fun ExecutionInput.getAutomaticPersistedQueriesExtension(): AutomaticPersistedQueriesExtension? =
@@ -34,13 +17,13 @@ fun ExecutionInput.getAutomaticPersistedQueriesExtension(): AutomaticPersistedQu
         null
     }
 
-fun ExecutionInput.getQueryId(): String =
-    String.format(
+fun ExecutionInput.getQueryId(): String {
+    val messageDigest = MessageDigest.getInstance("SHA-256")
+    return String.format(
         "%064x",
-        BigInteger(1, MESSAGE_DIGEST.digest(this.query.toByteArray(StandardCharsets.UTF_8)))
-    ).also {
-        MESSAGE_DIGEST.reset()
-    }
+        BigInteger(1, messageDigest.digest(this.query.toByteArray(StandardCharsets.UTF_8)))
+    )
+}
 
 fun ExecutionInput.isAutomaticPersistedQueriesExtensionInvalid(
     extension: AutomaticPersistedQueriesExtension