add: created new rest controller for aws iot shadow

src/main/java/com/backend/glowhouse/controller/DeviceShadowController.java

+package com.backend.glowhouse.controller;
+
+import com.amazonaws.services.iot.client.AWSIotException;
+import com.amazonaws.services.iot.client.AWSIotMqttClient;
+import com.amazonaws.services.iot.client.AWSIotTopic;
+import com.backend.glowhouse.config.AwsIotUtil;
+import com.backend.glowhouse.model.DeviceShadow;
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.ixortalk.iot.client.core.IotClient;
+import com.ixortalk.iot.client.core.config.IotListener;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+import javax.inject.Inject;
+
+import com.ixortalk.iot.client.core.IotClient;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import javax.inject.Inject;
+
+import static org.springframework.http.ResponseEntity.ok;
+import static org.springframework.web.bind.annotation.RequestMethod.POST;
+
+@RestController
+@RequestMapping("/api/shadow")
+public class DeviceShadowController {
+    private static final Logger logger = LoggerFactory.getLogger(DeviceShadowController.class);
+
+    @Inject
+    private IotClient iotClient;
+
+    private String endpoint = "a2atwjvz13hwor-ats.iot.eu-west-1.amazonaws.com";
+
+    private String clientId = "ixortalk-iot-client-001";
+
+    private String cert = "/Users/Luke/Desktop/Repositories/glowhouse-workspace/glowhouse-backend/glowhouse/src/main/resources/aws/cert.crt";
+
+    private String key = "/Users/Luke/Desktop/Repositories/glowhouse-workspace/glowhouse-backend/glowhouse/src/main/resources/aws/private.key";
+
+    @PostMapping
+    @RequestMapping(method = POST, path = "/update")
+    public ResponseEntity updateShadow(@RequestBody String payload) {
+        iotClient.publish("$aws/things/glowhouse/shadow/update", payload);
+
+        return ok().build();
+    }
+
+    @GetMapping("/get")
+    public String getDeviceShadow(@RequestParam(value = "deviceId") String deviceId) throws AWSIotException {
+        AwsIotUtil.KeyStorePasswordPair pair = AwsIotUtil.getKeyStorePasswordPair(cert, key, null);
+
+        assert pair != null;
+        AWSIotMqttClient awsIotClient = new AWSIotMqttClient(endpoint, clientId, pair.keyStore, pair.keyPassword);
+        DeviceShadow deviceShadow = new DeviceShadow(deviceId);
+
+        awsIotClient.attach(deviceShadow);
+        awsIotClient.connect();
+
+        return deviceShadow.get();
+    }
+
+    @IotListener
+    public void listen(Object message) {
+        logger.info("Consumed message: " + message);
+    }
+
+}