Add new EnvProperties class

Added new class EnvProperties, which extends java.util.Properties
and supports property values containing embedded environment
variable references.  Updated code to use this class to load
svclogic.properties, and updated dmaap listener to use
that class to load dmaap listener configuration.

Issue-ID: SDNC-1482
Signed-off-by: Dan Timoney <dtimoney@att.com>
Change-Id: I7538b719631d8c10c27d059aeb4f70ce92760ebd

3 files changed, 147 insertions, 0 deletions

diff --git a/core/utils/provider/src/main/java/org/onap/ccsdk/sli/core/utils/common/EnvProperties.java b/core/utils/provider/src/main/java/org/onap/ccsdk/sli/core/utils/common/EnvProperties.java
new file mode 100644
index 000000000..2e9f2673d
--- /dev/null
+++ b/core/utils/provider/src/main/java/org/onap/ccsdk/sli/core/utils/common/EnvProperties.java
@@ -0,0 +1,61 @@
+package org.onap.ccsdk.sli.core.utils.common;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.Reader;
+import java.util.Enumeration;
+import java.util.Properties;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+public class EnvProperties extends Properties {
+
+    @Override
+    public synchronized void load(Reader reader) throws IOException {
+        super.load(reader);
+        resolveAllValues();
+    }
+
+    @Override
+    public synchronized void load(InputStream inStream) throws IOException {
+        super.load(inStream);
+        resolveAllValues();
+    }
+
+	@Override
+	public synchronized Object setProperty(String key, String value) {
+		return super.setProperty(key, EnvProperties.resolveValue(value));
+	}
+
+    private void resolveAllValues() {
+       Enumeration<?> propNames = propertyNames();
+
+       while (propNames.hasMoreElements()) {
+           String propName = (String) propNames.nextElement();
+           super.setProperty(propName, EnvProperties.resolveValue(getProperty(propName)));
+       }
+       
+    }
+
+    public static String resolveValue(String value) {
+        if (value == null) {
+            return null;
+        }
+
+        Pattern p = Pattern.compile("\\$\\{(\\w+)((?:\\:\\-)([^\\}]*))?\\}");
+        Matcher m = p.matcher(value);
+
+        StringBuffer sb = new StringBuffer();
+        while (m.find()) {
+            String envVarName = null == m.group(1) ? m.group(2) : m.group(1);
+            String envVarDefault = null == m.group(3) ? "" : m.group(3);
+            String envVarValue = System.getenv(envVarName);
+
+            m.appendReplacement(sb,
+                null == envVarValue ? Matcher.quoteReplacement(envVarDefault) : Matcher.quoteReplacement(envVarValue));
+         }
+        m.appendTail(sb);
+        return sb.toString();
+        
+    }
+}
diff --git a/core/utils/provider/src/test/java/org/onap/ccsdk/sli/core/utils/common/EnvPropertiesTest.java b/core/utils/provider/src/test/java/org/onap/ccsdk/sli/core/utils/common/EnvPropertiesTest.java
new file mode 100644
index 000000000..bee432577
--- /dev/null
+++ b/core/utils/provider/src/test/java/org/onap/ccsdk/sli/core/utils/common/EnvPropertiesTest.java
@@ -0,0 +1,59 @@
+package org.onap.ccsdk.sli.core.utils.common;
+
+import static org.junit.Assert.*;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.util.Properties;
+
+import org.junit.Before;
+import org.junit.Test;
+
+public class EnvPropertiesTest {
+
+    @Test
+    public void loadStreamTest() throws IOException {
+        InputStream testStr = getClass().getResourceAsStream("/svclogic.properties");
+
+        Properties props = new EnvProperties();
+        props.load(testStr);
+        
+        assertEquals("jdbc", props.getProperty("org.onap.ccsdk.sli.dbtype"));
+        String dbUrl = "jdbc:derby:memory:"+System.getenv("MYSQL_DATABASE")+";create=true";
+        assertEquals(dbUrl, props.getProperty("org.onap.ccsdk.sli.jdbc.url"));
+        assertEquals("org.apache.derby.jdbc.EmbeddedDriver", props.getProperty("org.onap.ccsdk.sli.jdbc.driver"));
+        assertEquals(System.getenv("MYSQL_DATABASE"), props.getProperty("org.onap.ccsdk.sli.jdbc.database"));
+        assertEquals(System.getenv("MYSQL_USER"), props.getProperty("org.onap.ccsdk.sli.jdbc.user") );
+        assertEquals(System.getenv("MYSQL_PASSWORD"), props.getProperty("org.onap.ccsdk.sli.jdbc.password"));
+    }
+
+    @Test
+    public void loadReaderTest() throws IOException {
+        InputStream testStr = getClass().getResourceAsStream("/svclogic.properties");
+        BufferedReader testReader = new BufferedReader(new InputStreamReader(testStr));
+
+        Properties props = new EnvProperties();
+        props.load(testReader);
+        
+        assertEquals("jdbc", props.getProperty("org.onap.ccsdk.sli.dbtype"));
+        String dbUrl = "jdbc:derby:memory:"+System.getenv("MYSQL_DATABASE")+";create=true";
+        assertEquals(dbUrl, props.getProperty("org.onap.ccsdk.sli.jdbc.url"));
+        assertEquals("org.apache.derby.jdbc.EmbeddedDriver", props.getProperty("org.onap.ccsdk.sli.jdbc.driver"));
+        assertEquals(System.getenv("MYSQL_DATABASE"), props.getProperty("org.onap.ccsdk.sli.jdbc.database"));
+        assertEquals(System.getenv("MYSQL_USER"), props.getProperty("org.onap.ccsdk.sli.jdbc.user"));
+        assertEquals(System.getenv("MYSQL_PASSWORD"), props.getProperty("org.onap.ccsdk.sli.jdbc.password"));
+    }
+
+    @Test
+    public void setPropertyTest() {
+        Properties props = new EnvProperties();
+
+        props.setProperty("path", "${PATH}");
+        props.setProperty("dummy", "${UNSET_DUMMY:-dummyvalue}");
+        assertEquals(System.getenv("PATH"), props.getProperty("path"));
+        assertEquals("dummyvalue", props.getProperty("dummy"));
+    }
+    
+}
diff --git a/core/utils/provider/src/test/resources/svclogic.properties b/core/utils/provider/src/test/resources/svclogic.properties
new file mode 100644
index 000000000..0d62389f2
--- /dev/null
+++ b/core/utils/provider/src/test/resources/svclogic.properties
@@ -0,0 +1,27 @@
+###
+# ============LICENSE_START=======================================================
+# ONAP : CCSDK
+# ================================================================================
+# Copyright (C) 2017 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=========================================================
+###
+
+org.onap.ccsdk.sli.dbtype = jdbc
+org.onap.ccsdk.sli.jdbc.url=jdbc:derby:memory:${MYSQL_DATABASE};create=true
+org.onap.ccsdk.sli.jdbc.driver=${MYSQL_DRIVER:-org.apache.derby.jdbc.EmbeddedDriver}
+org.onap.ccsdk.sli.jdbc.database = ${MYSQL_DATABASE}
+org.onap.ccsdk.sli.jdbc.user = ${MYSQL_USER}
+org.onap.ccsdk.sli.jdbc.password = ${MYSQL_PASSWORD}