Create methods for creating temp files

Created utility methods to create temp files and set default
permissions.  These can be used in other repos to satisfy sonar.
Also added code to close streams and clean up temp files created
by some junit tests.
Modified to use IOUtils to read a stream.

Issue-ID: POLICY-3289
Change-Id: Ic83e4f4d7745be7b37ebb42bf1d81e303d8dadc9
Signed-off-by: Jim Hahn <jrh3@att.com>

1 files changed, 63 insertions, 0 deletions

diff --git a/utils/src/main/java/org/onap/policy/common/utils/resources/DirectoryUtils.java b/utils/src/main/java/org/onap/policy/common/utils/resources/DirectoryUtils.java
new file mode 100644
index 00000000..35a13138
--- /dev/null
+++ b/utils/src/main/java/org/onap/policy/common/utils/resources/DirectoryUtils.java
@@ -0,0 +1,63 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP
+ * ================================================================================
+ * Copyright (C) 2021 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * 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
+ *
+ *      http://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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.common.utils.resources;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import lombok.AccessLevel;
+import lombok.NoArgsConstructor;
+import org.apache.commons.io.FileUtils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Utilities for manipulating directories.
+ */
+@NoArgsConstructor(access = AccessLevel.PRIVATE)
+public final class DirectoryUtils {
+    private static final Logger logger = LoggerFactory.getLogger(DirectoryUtils.class);
+
+    /**
+     * Creates a directory file, only accessible by the owner.
+     *
+     * @param prefix file name prefix
+     * @return a new, temporary directory
+     * @throws IOException if an error occurs
+     */
+    public static Path createTempDirectory(String prefix) throws IOException {
+        /*
+         * Disabling sonar, as the code below sets the permissions, just as sonar
+         * suggests it be fixed.
+         */
+        var path = Files.createTempDirectory(prefix);           // NOSONAR
+        logger.info("created temporary directory, {}", path);
+
+        var file = path.toFile();
+
+        TextFileUtils.setDefaultPermissions(file);
+
+        // ensure nothing has been written to it yet
+        FileUtils.cleanDirectory(file);
+
+        return path;
+    }
+}