Add sdnr wt apigateway

Add complete sdnr wireless transport app apigateway

Change-Id: I133ece9cd78c8e5d1a4d74cca1b45feaaf4da9a5
Issue-ID: SDNC-571
Signed-off-by: Herbert Eiselt <herbert.eiselt@highstreet-technologies.com>

5 files changed, 736 insertions, 0 deletions

diff --git a/sdnr/wt/apigateway/provider/src/main/java/org/onap/ccsdk/features/sdnr/wt/apigateway/AaiServlet.java b/sdnr/wt/apigateway/provider/src/main/java/org/onap/ccsdk/features/sdnr/wt/apigateway/AaiServlet.java
new file mode 100644
index 000000000..e73d5c668
--- /dev/null
+++ b/sdnr/wt/apigateway/provider/src/main/java/org/onap/ccsdk/features/sdnr/wt/apigateway/AaiServlet.java
@@ -0,0 +1,74 @@
+/*
+ * ============LICENSE_START=======================================================
+ * ONAP : CCSDK.apps.sdnr.wt.apigateway
+ * ================================================================================
+ * Copyright (C) 2019 highstreet technologies GmbH 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.ccsdk.features.sdnr.wt.apigateway;
+
+import java.io.IOException;
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+public class AaiServlet extends BaseServlet {
+
+	/**
+	 *
+	 */
+	private static final long serialVersionUID = 5946205120796162644L;
+	private static final String OFFLINE_RESPONSE_MESSAGE = "AAI interface is offline";
+
+	public AaiServlet() {
+		super();
+	}
+
+	@Override
+	protected void doOptions(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+		resp.setStatus(200);
+	}
+
+	@Override
+	protected String getOfflineResponse() {
+		return OFFLINE_RESPONSE_MESSAGE;
+	}
+
+	@Override
+	protected boolean isOff() {
+		return MyProperties.getInstance().isAAIOff();
+	}
+
+	@Override
+	protected String getRemoteUrl(String uri) {
+
+		if (uri.startsWith("/")) {
+			uri = uri.substring(1);
+		}
+		if (uri.startsWith("aai")) {
+			uri = uri.substring("aai".length());
+		}
+		if (uri.startsWith("/")) {
+			uri = uri.substring(1);
+		}
+		String base = MyProperties.getInstance().getAAIBaseUrl();
+		if (!base.endsWith("/")) {
+			base += "/";
+		}
+
+		return base + uri;
+	}
+}
diff --git a/sdnr/wt/apigateway/provider/src/main/java/org/onap/ccsdk/features/sdnr/wt/apigateway/BaseServlet.java b/sdnr/wt/apigateway/provider/src/main/java/org/onap/ccsdk/features/sdnr/wt/apigateway/BaseServlet.java
new file mode 100644
index 000000000..b2bc30c0e
--- /dev/null
+++ b/sdnr/wt/apigateway/provider/src/main/java/org/onap/ccsdk/features/sdnr/wt/apigateway/BaseServlet.java
@@ -0,0 +1,350 @@
+/*
+ * ============LICENSE_START=======================================================
+ * ONAP : CCSDK.apps.sdnr.wt.apigateway
+ * ================================================================================
+ * Copyright (C) 2019 highstreet technologies GmbH 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.ccsdk.features.sdnr.wt.apigateway;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.net.HttpURLConnection;
+import java.net.URL;
+import java.net.URLConnection;
+import java.nio.charset.StandardCharsets;
+import java.security.KeyManagementException;
+import java.security.NoSuchAlgorithmException;
+import java.util.Enumeration;
+import java.util.List;
+import java.util.Map;
+
+import javax.net.ssl.HostnameVerifier;
+import javax.net.ssl.HttpsURLConnection;
+import javax.net.ssl.SSLContext;
+import javax.net.ssl.SSLSession;
+import javax.net.ssl.TrustManager;
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public abstract class BaseServlet extends HttpServlet {
+
+	/**
+	 * 
+	 */
+	private static final long serialVersionUID = 7403047480257892794L;
+	private static Logger LOG = LoggerFactory.getLogger(BaseServlet.class);
+	private static SSLContext sc;
+	private boolean trustAll = false;
+	private static TrustManager[] trustCerts = null;
+	private static final int BUFSIZE = 2048;
+
+	protected abstract String getOfflineResponse();
+
+	protected abstract boolean isOff();
+
+	protected abstract String getRemoteUrl(String uri);
+
+	/**
+	 *
+	 * @throws NoSuchAlgorithmException
+	 * @throws KeyManagementException
+	 */
+	private static void setupSslTrustAll(boolean trustall) throws NoSuchAlgorithmException, KeyManagementException {
+
+		sc = SSLContext.getInstance("TLSv1.2");
+		if (trustall) {
+			if (trustCerts == null) {
+				trustCerts = new TrustManager[] { new javax.net.ssl.X509TrustManager() {
+					@Override
+					public java.security.cert.X509Certificate[] getAcceptedIssuers() {
+						return new java.security.cert.X509Certificate[] {};
+					}
+
+					@Override
+					public void checkClientTrusted(java.security.cert.X509Certificate[] certs, String authType) {
+						// do not check anything when trust all
+					}
+
+					@Override
+					public void checkServerTrusted(java.security.cert.X509Certificate[] certs, String authType) {
+						// do not check anything when trust all
+					}
+				} };
+			}
+		} else {
+			if (trustCerts != null)
+				trustCerts = null;
+		}
+		// Init the SSLContext with a TrustManager[] and SecureRandom()
+		sc.init(null, trustCerts, new java.security.SecureRandom());
+	}
+
+	public BaseServlet() {
+		try {
+			MyProperties.Instantiate();
+		} catch (Exception e) {
+			LOG.error(e.getMessage());
+		}
+		this.trysslSetup(true);
+	}
+
+	private void trysslSetup() {
+		this.trysslSetup(false);
+	}
+
+	/**
+	 * init or deinit ssl insecure mode regarding to property
+	 * 
+	 * @param force init independent from property
+	 */
+	private void trysslSetup(boolean force) {
+		// if trustall config has changed
+		if (force || trustAll != MyProperties.getInstance().trustInsecure()) {
+			// resetup ssl config
+			trustAll = MyProperties.getInstance().trustInsecure();
+			try {
+				setupSslTrustAll(trustAll);
+			} catch (Exception e) {
+				LOG.error("problem setting up SSL: {}", e.getMessage());
+			}
+		}
+	}
+
+	protected void sendOffResponse(HttpServletResponse response) {
+		response.setStatus(200);// HTML/OK
+		response.setHeader("Content-Type", "text/html; charset=utf-8");
+		try {
+			response.getOutputStream().write(this.getOfflineResponse().getBytes(StandardCharsets.UTF_8));
+		} catch (IOException e) {
+			LOG.debug("problem writing offline response");
+		}
+
+	}
+
+	@Override
+	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+		if (this.isOff()) {
+			this.sendOffResponse(resp);
+		} else {
+			this.trysslSetup();
+			HttpURLConnection http = null;
+			try {
+				http = (HttpURLConnection) this.getConnection(req, "GET");
+			} catch (IOException e) {
+				LOG.warn(e.getMessage());
+			}
+			if (http != null) {
+				try {
+					this.handleRequest(http, req, resp, "GET");
+				} catch (IOException e) {
+					LOG.warn(e.getMessage());
+				}
+				http.disconnect();
+			}
+		}
+	}
+
+	@Override
+	protected void doPut(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+		if (this.isOff()) {
+			this.sendOffResponse(resp);
+		} else {
+			this.trysslSetup();
+			HttpURLConnection http = null;
+			try {
+				http = (HttpURLConnection) this.getConnection(req, "PUT");
+			} catch (IOException e) {
+				LOG.warn(e.getMessage());
+			}
+			if (http != null) {
+				try {
+					this.handleRequest(http, req, resp, "PUT");
+				} catch (IOException e) {
+					LOG.warn(e.getMessage());
+				}
+				http.disconnect();
+			}
+		}
+	}
+
+	@Override
+	protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+		if (this.isOff()) {
+			this.sendOffResponse(resp);
+		} else {
+			this.trysslSetup();
+			HttpURLConnection http = null;
+			try {
+				http = (HttpURLConnection) this.getConnection(req, "POST");
+			} catch (IOException e) {
+				LOG.warn(e.getMessage());
+			}
+			if (http != null) {
+				try {
+					this.handleRequest(http, req, resp, "POST");
+				} catch (IOException e) {
+					LOG.warn(e.getMessage());
+				}
+				http.disconnect();
+			}
+		}
+	}
+
+	@Override
+	protected void doDelete(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+		if (this.isOff()) {
+			this.sendOffResponse(resp);
+		} else {
+			this.trysslSetup();
+			HttpURLConnection http = null;
+			try {
+				http = (HttpURLConnection) this.getConnection(req, "DELETE");
+			} catch (IOException e) {
+				LOG.warn(e.getMessage());
+			}
+			if (http != null) {
+				try {
+					this.handleRequest(http, req, resp, "DELETE");
+				} catch (IOException e) {
+					LOG.warn(e.getMessage());
+				}
+				http.disconnect();
+			}
+		}
+	}
+
+	private URLConnection getConnection(HttpServletRequest req, final String method) throws IOException {
+
+		LOG.debug("{} Request", method);
+		String surl = this.getRemoteUrl(req.getRequestURI());
+		LOG.debug("RemoteURL: {}", surl);
+		URL url = new URL(surl);
+		URLConnection http = url.openConnection();
+		((HttpURLConnection) http).setRequestMethod(method);
+		if (url.toString().startsWith("https")) {
+			((HttpsURLConnection) http).setSSLSocketFactory(sc.getSocketFactory());
+			if (trustAll) {
+				HostnameVerifier allHostsValid = new HostnameVerifier() {
+
+					@Override
+					public boolean verify(String hostname, SSLSession session) {
+						// do not verify host if trust all
+						return true;
+					}
+				};
+				((HttpsURLConnection) http).setHostnameVerifier(allHostsValid);
+			}
+		}
+		http.setDoOutput(true);
+		// copy request headers
+		String s = "";
+		Enumeration<String> headers = req.getHeaderNames();
+		while (headers.hasMoreElements()) {
+			String h = headers.nextElement();
+			String v = req.getHeader(h);
+			if (h != null && h.equals("Host")) {
+				v = url.getAuthority();
+			}
+			s += String.format("%s:%s;", h, v);
+			http.setRequestProperty(h, v);
+		}
+		LOG.debug("Request Headers: {}", s);
+		return http;
+	}
+
+	private void handleRequest(HttpURLConnection http, HttpServletRequest req, HttpServletResponse resp, String method)
+			throws IOException {
+		byte[] buffer = new byte[BUFSIZE];
+		int len = 0, lensum = 0;
+		// send request
+		// Send the message to destination
+		OutputStream output = null;
+		if (!method.equals("GET")) {
+			try {
+				output = http.getOutputStream();
+			} catch (Exception e) {
+				LOG.debug("problem reading output stream: {}", e.getMessage());
+			}
+		}
+		if (output != null) {
+			while (true) {
+				len = req.getInputStream().read(buffer, 0, BUFSIZE);
+				if (len <= 0) {
+					break;
+				}
+				lensum += len;
+				output.write(buffer, 0, len);
+			}
+		}
+		LOG.debug("written {} data out", lensum);
+		int responseCode = http.getResponseCode();
+		// Receive answer
+		InputStream response;
+		if (responseCode >= 200 && responseCode < 300) {
+			response = http.getInputStream();
+		} else {
+			response = http.getErrorStream();
+			if (response == null) {
+				http.getInputStream();
+			}
+		}
+
+		LOG.debug("ResponseCode: {}", responseCode);
+		resp.setStatus(responseCode);
+		Map<String, List<String>> set = http.getHeaderFields();
+		String s = "";
+		if (set != null) {
+			for (Map.Entry<String, List<String>> entry : set.entrySet()) {
+				if (entry.getKey() == null) {
+					continue;
+				}
+				for (String v : entry.getValue()) {
+					resp.setHeader(entry.getKey(), v);
+					s += String.format("%s:%s;", entry.getKey(), v);
+				}
+				if (MyProperties.getInstance().corsEnabled()) {
+					resp.setHeader("Access-Control-Allow-Origin", "*");
+					// resp.setHeader("Access-Control-Allow-Methods", "GET,PUT,POST,DELETE");
+					resp.setHeader("Access-Control-Allow-Headers", "Content-Type, Authorization");
+				}
+
+			}
+		}
+		LOG.debug("Received Headers: {}", s);
+		lensum = 0;
+		if (response != null) {
+			while (true) {
+				len = response.read(buffer, 0, BUFSIZE);
+				if (len <= 0) {
+					break;
+				}
+				lensum += len;
+				resp.getOutputStream().write(buffer, 0, len);
+			}
+		} else {
+			LOG.debug("response is null");
+		}
+		LOG.debug("Received {} bytes", lensum);
+	}
+
+}
diff --git a/sdnr/wt/apigateway/provider/src/main/java/org/onap/ccsdk/features/sdnr/wt/apigateway/EsServlet.java b/sdnr/wt/apigateway/provider/src/main/java/org/onap/ccsdk/features/sdnr/wt/apigateway/EsServlet.java
new file mode 100644
index 000000000..9d276ffc8
--- /dev/null
+++ b/sdnr/wt/apigateway/provider/src/main/java/org/onap/ccsdk/features/sdnr/wt/apigateway/EsServlet.java
@@ -0,0 +1,67 @@
+/*
+ * ============LICENSE_START=======================================================
+ * ONAP : CCSDK.apps.sdnr.wt.apigateway
+ * ================================================================================
+ * Copyright (C) 2019 highstreet technologies GmbH 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.ccsdk.features.sdnr.wt.apigateway;
+
+import java.io.IOException;
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+public class EsServlet extends BaseServlet {
+
+	/**
+	 *
+	 */
+	private static final long serialVersionUID = -3996363343749995011L;
+	private static final String OFFLINE_RESPONSE_MESSAGE = "Database interface is offline";
+
+	public EsServlet() {
+		super();
+	}
+
+	@Override
+	protected void doOptions(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+		if (MyProperties.getInstance().corsEnabled()) {
+			resp.addHeader("Access-Control-Allow-Origin", "*");
+			resp.addHeader("Access-Control-Allow-Methods", "GET,PUT,POST,DELETE");
+			resp.addHeader("Access-Control-Allow-Headers", "Content-Type, Authorization");
+		}
+		resp.setStatus(200);
+	}
+
+	@Override
+	protected String getOfflineResponse() {
+		return OFFLINE_RESPONSE_MESSAGE;
+	}
+
+	@Override
+	protected boolean isOff() {
+		return MyProperties.getInstance().isEsOff();
+	}
+
+	@Override
+	protected String getRemoteUrl(String uri) {
+		if (uri != null && uri.length() > 0) {
+			uri = uri.substring("/database".length());
+		}
+		return MyProperties.getInstance().getEsBaseUrl() + uri;
+	}
+}
diff --git a/sdnr/wt/apigateway/provider/src/main/java/org/onap/ccsdk/features/sdnr/wt/apigateway/MsServlet.java b/sdnr/wt/apigateway/provider/src/main/java/org/onap/ccsdk/features/sdnr/wt/apigateway/MsServlet.java
new file mode 100644
index 000000000..27697930f
--- /dev/null
+++ b/sdnr/wt/apigateway/provider/src/main/java/org/onap/ccsdk/features/sdnr/wt/apigateway/MsServlet.java
@@ -0,0 +1,74 @@
+/*
+ * ============LICENSE_START=======================================================
+ * ONAP : CCSDK.apps.sdnr.wt.apigateway
+ * ================================================================================
+ * Copyright (C) 2019 highstreet technologies GmbH 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.ccsdk.features.sdnr.wt.apigateway;
+
+import java.io.IOException;
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class MsServlet extends BaseServlet {
+
+	/**
+	 *
+	 */
+	private static final long serialVersionUID = -5361461082028405171L;
+	private static final String OFFLINE_RESPONSE_MESSAGE = "MediatorServer interface is offline";
+
+	public MsServlet() {
+
+		super();
+	}
+
+	@Override
+	protected void doOptions(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+		resp.setStatus(200);
+	}
+
+	@Override
+	protected String getOfflineResponse() {
+		return OFFLINE_RESPONSE_MESSAGE;
+	}
+
+	@Override
+	protected boolean isOff() {
+		return true;
+	}
+
+	@Override
+	protected String getRemoteUrl(String uri) {
+		String dbServerId = "0";
+		if (uri == null)
+			uri = "";
+		if (uri.length() > 0) {
+			uri = uri.substring("/ms".length());
+			dbServerId = uri.substring(0, uri.indexOf("/"));
+		}
+		return this.getBaseUrl(dbServerId) + uri;
+	}
+
+	protected String getBaseUrl(String dbServerId) {
+		return "";
+	}
+}
diff --git a/sdnr/wt/apigateway/provider/src/main/java/org/onap/ccsdk/features/sdnr/wt/apigateway/MyProperties.java b/sdnr/wt/apigateway/provider/src/main/java/org/onap/ccsdk/features/sdnr/wt/apigateway/MyProperties.java
new file mode 100644
index 000000000..3d66f526e
--- /dev/null
+++ b/sdnr/wt/apigateway/provider/src/main/java/org/onap/ccsdk/features/sdnr/wt/apigateway/MyProperties.java
@@ -0,0 +1,171 @@
+/*
+ * ============LICENSE_START=======================================================
+ * ONAP : CCSDK.apps.sdnr.wt.apigateway
+ * ================================================================================
+ * Copyright (C) 2019 highstreet technologies GmbH 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.ccsdk.features.sdnr.wt.apigateway;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Properties;
+
+import org.json.JSONArray;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class MyProperties {
+
+	private static Logger LOG = LoggerFactory.getLogger(MyProperties.class);
+	public static final String PROPFILE = "etc/apigateway.properties";
+	private static final String DEFAULT_AAI_HEADERS = "[\"X-FromAppId:SDNR\",\"Authorization:Basic QUFJOkFBSQ==\"]";
+	private static final String DEFAULT_CORSENABLED = "0";
+	private static final String DEFAULT_TRUSTINSECURE = "0";
+	private static final String DEFAULT_ESDATABASE = "http://localhost:9200";
+	private static final String DEFAULT_AAI = "off";
+
+	@Override
+	public String toString() {
+		return "MyProperties [aaiBase=" + aaiBase + ", aaiHeaders=" + aaiHeaders + ", esBase=" + esBase
+				+ ", trustInsecure=" + trustInsecure + ", corsEnabled=" + corsEnabled + "]";
+	}
+
+	private static MyProperties mObj;
+
+	private String aaiBase;
+	private Map<String, String> aaiHeaders;
+	private String esBase;
+
+	private boolean trustInsecure;
+
+	private boolean corsEnabled;
+
+	public boolean isAAIOff() {
+		return this.aaiBase == null ? true : this.aaiBase.equals("off");
+	}
+
+	public boolean isEsOff() {
+		return this.esBase == null ? true : this.esBase.equals("off");
+	}
+
+	public String getAAIBaseUrl() {
+		return this.aaiBase;
+	}
+
+	public String getEsBaseUrl() {
+		return this.esBase;
+	}
+
+	public Map<String, String> getAAIHeaders() {
+		return this.aaiHeaders;
+	}
+
+	public boolean trustInsecure() {
+		return this.trustInsecure;
+	}
+
+	public boolean corsEnabled() {
+		return this.corsEnabled;
+	}
+
+	public static MyProperties Instantiate() throws IOException, NumberFormatException {
+		return Instantiate(new File(PROPFILE));
+	}
+
+	public static MyProperties Instantiate(File file) throws IOException, NumberFormatException {
+
+		return Instantiate(file, false);
+	}
+
+	public static MyProperties Instantiate(File file, boolean force) throws IOException, NumberFormatException {
+		if (mObj == null || force) {
+			mObj = new MyProperties(file);
+			LOG.debug("instantiated: {}", mObj.toString());
+		}
+		return mObj;
+	}
+
+	private MyProperties(File file) throws IOException, NumberFormatException {
+		this.aaiBase = "off";
+		this.trustInsecure = false;
+		if (!file.exists()) {
+			this.writeDefaults(file);
+		}
+		this.load(new FileInputStream(file));
+	}
+
+	public void load(InputStream in) throws IOException, NumberFormatException {
+
+		Properties defaultProps = new Properties();
+		defaultProps.load(in);
+		in.close();
+
+		this.aaiBase = defaultProps.getProperty("aai", DEFAULT_AAI);
+		this.aaiHeaders = _parseHeadersMap(defaultProps.getProperty("aaiHeaders", DEFAULT_AAI_HEADERS));
+		this.esBase = defaultProps.getProperty("database", DEFAULT_ESDATABASE);
+		this.trustInsecure = Integer.parseInt(defaultProps.getProperty("insecure", DEFAULT_TRUSTINSECURE)) == 1;
+		this.corsEnabled = Integer.parseInt(defaultProps.getProperty("cors", DEFAULT_CORSENABLED)) == 1;
+	}
+
+	private static Map<String, String> _parseHeadersMap(String s) {
+		Map<String, String> r = new HashMap<>();
+		try {
+			JSONArray a = new JSONArray(s);
+			if ( a.length() > 0) {
+				for (int i = 0; i < a.length(); i++) {
+					String item = a.getString(i);
+					String[] hlp = item.split(":");
+					if (hlp.length > 1) {
+						r.put(hlp[0], hlp[1]);
+					}
+				}
+			}
+		} catch (Exception e) {
+			LOG.warn("problem loading headers map: {}",e.getMessage());
+		}
+		return r;
+	}
+
+	private String writeDefaults(File f) throws IOException {
+		StringBuilder sb = new StringBuilder();
+		final String LR = "\n";
+		FileWriter fw = new FileWriter(f);
+		sb.append("aai=" + DEFAULT_AAI + LR);
+		sb.append("aaiHeaders=" + DEFAULT_AAI_HEADERS + LR);
+		sb.append("database=" + DEFAULT_ESDATABASE + LR);
+		sb.append("insecure=" + DEFAULT_TRUSTINSECURE + LR);
+		sb.append("cors=" + DEFAULT_CORSENABLED);
+		try {
+			fw.write(sb.toString());
+		} catch (Exception e) {
+			LOG.warn("problem writing default values to propertyfile {} : {}", f.getAbsolutePath() , e.getMessage());
+		} finally {
+			fw.close();
+		}
+		return sb.toString();
+	}
+
+	public static MyProperties getInstance() {
+		return mObj;
+	}
+
+}