adding an API to fetch user info by email attribute <ManeyMR>.

src/main/java/com/tarento/upsmf/userManagement/controller/UserController.java

@@ -37,6 +37,11 @@ public class UserController {
         return userHandler.userDetails(body);
     }
 
+    @PostMapping(value = "/emaildetails", consumes = "application/json", produces = "application/json")
+    public String userEmailDetails(@RequestBody final JsonNode body) throws URISyntaxException, IOException {
+        return userHandler.userEmailDetails(body);
+    }
+
     @PostMapping(value = "/list", consumes = "application/json", produces = "application/json")
     public String listUser(@RequestBody final JsonNode body) throws URISyntaxException, IOException {
         return userHandler.listUser(body);

src/main/java/com/tarento/upsmf/userManagement/handler/UserHandler.java

@@ -68,6 +68,12 @@ public class UserHandler {
         return userName;
     }
 
+    public String userEmailDetails(final JsonNode body) throws IOException {
+        JsonNode request = body.get("request");
+        String userName = keycloakUserGetter.findUserByEmail(request.get("fieldName").asText(), request.get("fieldValue").asText());
+        return userName;
+    }
+
 
     public String listUser(final JsonNode body) throws URISyntaxException, IOException {
         logger.info("creating user with payload {} ", body.toPrettyString());

src/main/java/com/tarento/upsmf/userManagement/utility/KeycloakUserGetter.java

@@ -68,4 +68,29 @@ public class KeycloakUserGetter {
         logger.info("ResponseBody {}", responseBody);
         return responseBody;
     }
+
+    public String findUserByEmail(final String fieldName, final String fieldValue) throws IOException {
+        String userEndpoint = KEYCLOAK_USER_BASE_URL;
+        logger.info("userEndpoint: " ,userEndpoint);
+        if(fieldName != null && fieldValue!= null ) {
+            userEndpoint = userEndpoint + "?" + fieldName + "=" + fieldValue;
+            logger.info("userEndpoint {} after adding email : " ,userEndpoint);
+            JsonNode adminToken = keycloakTokenRetriever.getAdminToken();
+            logger.info("adminToken: " ,adminToken);
+            String accessToken = adminToken.get("access_token").asText();
+            logger.info("accessToken: " ,accessToken);
+
+            HttpClient httpClient = HttpClients.createDefault();
+            HttpGet httpGet = new HttpGet(userEndpoint);
+
+            httpGet.setHeader(HttpHeaders.AUTHORIZATION, "Bearer " + accessToken);
+            httpGet.setHeader(HttpHeaders.ACCEPT, "application/json");
+
+            org.apache.http.HttpResponse response = httpClient.execute(httpGet);
+            String responseBody = EntityUtils.toString(response.getEntity());
+            logger.info("ResponseBody {}", responseBody);
+            return responseBody;
+        }
+        return "No Response Generated since the inputs were null/empty.";
+    }
 }