zoho oauth grant service added

doc/zoho/README.md

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+# Zoho Web API
+
+AGL Dubai nutzt Zoho als Platform zusammen mit einer lokalen Steuerkanzlei
+
+## Test/Prod Account Imixs
+
+https://api-console.zoho.eu/
+https://api-console.zoho.eu/client/1000.NLTM2KUEHI696MSLGEIANATVGGX7IN
+
+```
+client ID= 1000.NLTM2KUEHI696MSLGEIANATVGGX7IN
+client secret= ee9ba49f16e77c64abb89cea13542d2326d8d03ce8
+```
+
+# Testumgebung
+
+https://books.zoho.eu/app/20105697367
+https://accounts.zoho.eu/home#
+
+API Docu:
+
+https://www.zoho.com/books/api/v3/introduction/
+
+Authentication:
+
+https://www.zoho.com/books/api/v3/oauth/
+
+Base API URI= https://accounts.zoho.eu/
+
+## 1. Generating Grant Token
+
+https://accounts.zoho.com/oauth/v2/auth?scope=ZohoBooks.invoices.CREATE,ZohoBooks.invoices.READ,ZohoBooks.invoices.UPDATE,ZohoBooks.invoices.DELETE&client_id=1000.NLTM2KUEHI696MSLGEIANATVGGX7IN&state=testing&response_type=code&redirect_uri=https://alexander-logistics-dwc.office-workflow.de/
+
+## 2. Generate Access and Refresh Token
+
+https://accounts.zoho.com/oauth/v2/token?code=1000.dd7exxxxxxxxxxxxxxxxxxxxxxxx9bb8.b6c0xxxxxxxxxxxxxxxxxxxxxxxxdca4&client_id=1000.NLTM2KUEHI696MSLGEIANATVGGX7IN&client_secret=ee9ba49f16e77c64abb89cea13542d2326d8d03ce8&redirect_uri=http://www.zoho.com/books&grant_type=authorization_code

office-alexander-logistics-app/src/main/java/com/alexanderlogistics/zoho/ZohoOAuthGrantService.java

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+/*  
+ *  Imixs-Workflow 
+ *  
+ *  Copyright (C) 2001-2020 Imixs Software Solutions GmbH,  
+ *  http://www.imixs.com
+ *  
+ *  This program is free software; you can redistribute it and/or 
+ *  modify it under the terms of the GNU General Public License 
+ *  as published by the Free Software Foundation; either version 2 
+ *  of the License, or (at your option) any later version.
+ *  
+ *  This program is distributed in the hope that it will be useful, 
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of 
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 
+ *  General Public License for more details.
+ *  
+ *  You can receive a copy of the GNU General Public
+ *  License at http://www.gnu.org/licenses/gpl.html
+ *  
+ *  Project: 
+ *      https://www.imixs.org
+ *      https://github.com/imixs/imixs-workflow
+ *  
+ *  Contributors:  
+ *      Imixs Software Solutions GmbH - Project Management
+ *      Ralph Soika - Software Developer
+ */
+
+package com.alexanderlogistics.zoho;
+
+import java.util.logging.Logger;
+
+import org.imixs.workflow.exceptions.QueryException;
+
+import jakarta.annotation.Resource;
+import jakarta.ejb.SessionContext;
+import jakarta.ejb.Stateless;
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
+import jakarta.ws.rs.GET;
+import jakarta.ws.rs.Path;
+import jakarta.ws.rs.Produces;
+import jakarta.ws.rs.core.Context;
+import jakarta.ws.rs.core.MediaType;
+
+/**
+ * Dieser API Endpoint dient dazu über zoho einen sogenannten Grant Token zu
+ * erhalten.
+ * 
+ * https://www.zoho.com/books/api/v3/oauth/
+ * 
+ * Er dient als redirect URL wenn jemand einen solchen Token über den Browser
+ * anfordert.
+ * Der URL muss hier als CallBack URL angegeben sein!
+ * 
+ * Beispiel:
+ * 
+ * https://accounts.zoho.com/oauth/v2/auth?scope=ZohoBooks.invoices.CREATE,ZohoBooks.invoices.READ,ZohoBooks.invoices.UPDATE,ZohoBooks.invoices.DELETE&client_id=1000.NLTM2KUEHI696MSLGEIANATVGGX7IN&state=testing&response_type=code&redirect_uri=https://alexander-logistics-dwc.office-workflow.de/api/zoho/grant
+ * 
+ * @version 1.0
+ * @author rsoika
+ *
+ */
+@Path("/zoho")
+@Stateless
+public class ZohoOAuthGrantService {
+
+    @Context
+    private HttpServletRequest servletRequest;
+
+    @Context
+    HttpServletResponse servletResponse;
+
+    @Resource
+    private SessionContext ctx;
+
+    private static Logger logger = Logger.getLogger(ZohoOAuthGrantService.class.getName());
+
+    @GET
+    @Path("/ping")
+    public String ping() {
+        logger.info("GET ping");
+        return "ping: " + System.currentTimeMillis();
+    }
+
+    /**
+     * Test method
+     * 
+     * @param workflowgroup
+     * @param task
+     * @return
+     * @throws QueryException
+     */
+    @GET
+    @Path("/grant")
+    @Produces({ MediaType.TEXT_HTML })
+    public String getGrantToken()
+            throws QueryException {
+
+        logger.info("├── Receive Grant Token from Zoho");
+        String baseURI = servletRequest.getRequestURL().toString();
+
+        logger.info("│   ├──  Base URI=" + baseURI);
+
+        return "Zoho Grant Token received!";
+    }
+
+}