Add controller to get and publish open api

src/main/java/com/smartharvester/controller/SmartHarvesterPublicationController.java

+package com.smartharvester.controller;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.mongodb.client.FindIterable;
+import com.mongodb.client.MongoCollection;
+import com.mongodb.client.MongoDatabase;
+import com.mongodb.client.MongoIterable;
+import com.smartharvester.dao.CatalogDaoRepository;
+import com.smartharvester.dao.OpenApiDaoRepository;
+import com.smartharvester.dao.UserDaoRepository;
+import com.smartharvester.exception.ResourceNotFoundException;
+import com.smartharvester.model.login.response.MessageResponse;
+import com.smartharvester.model.openapi.OpenApi;
+import com.smartharvester.model.user.Catalog;
+import com.smartharvester.model.user.SmartHarvesterUser;
+import com.smartharvester.service.UserDaoSevice;
+
+import io.swagger.v3.oas.annotations.tags.Tag;
+
+import org.bson.Document;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.data.mongodb.core.MongoTemplate;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.*;
+
+import javax.validation.Valid;
+
+@CrossOrigin(origins = "*")
+@RestController
+@Tag(name = "SmartHarvester publication", description = "Publication management")
+@RequestMapping("/harvester/publication")
+
+public class SmartHarvesterPublicationController {
+
+    @Autowired
+    private OpenApiDaoRepository openApiDaoRepository;
+
+    @Autowired
+    private CatalogDaoRepository catalogDoaRepository;
+
+    /**
+     * Method to get openAPI publication by this catolog id.
+     * 
+     * @return Open API object.
+     */
+
+    @GetMapping("/catalogs/{catId}")
+    public ResponseEntity<OpenApi> getPublication(@PathVariable("catId") String catId) {
+        return Optional.ofNullable(openApiDaoRepository.findByUUID(catId))
+                .map(openApi -> ResponseEntity.ok().body(openApi)).orElseGet(() -> ResponseEntity.notFound().build());
+    }
+
+    @PostMapping("/publish")
+    public ResponseEntity<?> registerUser(@Valid @RequestBody OpenApi openApi) {
+
+        String catId = openApi.getInfo().getxCatalogId();
+
+        if (catalogDoaRepository.findByCatId(catId) == null) {
+            return ResponseEntity
+                    .badRequest()
+                    .body(new MessageResponse("Error: Catalog not found!",HttpStatus.NOT_FOUND));
+        }
+
+        if (openApiDaoRepository.existsByCatalogId(catId)) {
+            openApiDaoRepository.delete(openApiDaoRepository.findByUUID(catId));
+        }
+
+        openApiDaoRepository.save(openApi);
+
+        return ResponseEntity.ok(new MessageResponse("Publication registered successfully!",HttpStatus.OK));
+    }
+
+    
+}
\ No newline at end of file

src/main/java/com/smartharvester/dao/OpenApiDaoRepository.java

@@ -2,6 +2,8 @@ package com.smartharvester.dao;
 
 
 import com.smartharvester.model.openapi.OpenApi;
+
+import org.springframework.data.mongodb.repository.ExistsQuery;
 import org.springframework.data.mongodb.repository.MongoRepository;
 import org.springframework.data.mongodb.repository.Query;
 import org.springframework.stereotype.Repository;
@@ -17,5 +19,7 @@ public interface OpenApiDaoRepository extends MongoRepository<OpenApi, Integer>
     @Query(value = "{'info.x-catalog-id' : ?0  }")
     OpenApi findByUUID(String uudi);
 
+    @ExistsQuery("{'info.x-catalog-id' : ?0}")
+    Boolean existsByCatalogId(String uudi); 
 
 }
\ No newline at end of file

src/main/java/com/smartharvester/model/openapi/OpenApiInfo.java

@@ -28,7 +28,7 @@ public class OpenApiInfo {
 
     @Field("x-catalog-id")
     @JsonProperty("x-catalog-id")
-    UUID xCatalogId;
+    String xCatalogId;
 
     public String getTitle() {
         return title;
@@ -78,11 +78,11 @@ public class OpenApiInfo {
         this.xPageParam = xPageParam;
     }
 
-    public UUID getxCatalogId() {
+    public String getxCatalogId() {
         return xCatalogId;
     }
 
-    public void setxCatalogId(UUID xCatalogId) {
+    public void setxCatalogId(String xCatalogId) {
         this.xCatalogId = xCatalogId;
     }
 }