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1. Adding springdoc-openapi Maven dependency

springdoc-openapi provides an integration between spring-boot and swagger-ui:

		<dependency>
			<groupId>org.springdoc</groupId>
			<artifactId>springdoc-openapi-starter-webmvc-ui</artifactId>
			<version>2.0.4</version>
		</dependency>

2. Defining General API Information (Using Annotations)

package com.springboot.blog;

import io.swagger.v3.oas.annotations.ExternalDocumentation;
import io.swagger.v3.oas.annotations.OpenAPIDefinition;
import io.swagger.v3.oas.annotations.info.Contact;
import io.swagger.v3.oas.annotations.info.Info;
import io.swagger.v3.oas.annotations.info.License;
import org.modelmapper.ModelMapper;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;

@OpenAPIDefinition(
		info = @Info(
				title = "Spring Boot Blog App REST APIs",
				version = "v1.0",
				description = "Spring Boot Blog App REST API Documentation",
				contact = @Contact(
						name = "Ramesh",
						email = "javaguides.net@gmail.com",
						url = "https://www.javaguides.net"
				),
				license = @License(
						name = "Apache 2.0",
						url = "https://www.javaguides.net/license"
				)

		),
		externalDocs = @ExternalDocumentation(
				description = "Spring Boot Blog App Documentation",
				url = "https://github.com/RameshMF/springboot-blog-rest-api"
		)
)
@SpringBootApplication
public class SpringbootBlogRestApiApplication {

	@Bean
	public ModelMapper modelMapper(){
		return new ModelMapper();
	}

	public static void main(String[] args) {
		SpringApplication.run(SpringbootBlogRestApiApplication.class, args);
	}

}

3. Spring Security Support for Swagger URLs (Public Access)

                                .requestMatchers("/swagger-ui/**").permitAll()
                                .requestMatchers("/v3/api-docs/**").permitAll()

4. Adding Authorization Header in Requests using @SecurityRequirement and @SecurityScheme

You should add the @SecurityRequirement tags to your protected APIs

    @PreAuthorize("hasRole('ADMIN')")
    // create blog post rest api
    @SecurityRequirement(name = "Bearer Authentication")
    @PostMapping("/api/v1/posts")
    public ResponseEntity<PostDto> createPost(@Valid @RequestBody PostDto postDto){
        return new ResponseEntity<>(postService.createPost(postDto), HttpStatus.CREATED);
    }

Add @SecurityScheme in SecurityConfig class:

@SecurityScheme(
        name = "Bearer Authentication",
        type = SecuritySchemeType.HTTP,
        bearerFormat = "JWT",
        scheme = "bearer"
)

5. Customizing REST Documentation with Annotations

package com.springboot.blog.controller;

import com.springboot.blog.payload.PostDto;
import com.springboot.blog.payload.PostResponse;
import com.springboot.blog.service.PostService;
import com.springboot.blog.utils.AppConstants;
import io.swagger.v3.oas.annotations.Operation;
import io.swagger.v3.oas.annotations.responses.ApiResponse;
import io.swagger.v3.oas.annotations.security.SecurityRequirement;
import io.swagger.v3.oas.annotations.tags.Tag;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.security.access.prepost.PreAuthorize;
import org.springframework.web.bind.annotation.*;

import jakarta.validation.Valid;

import java.util.List;

@RestController
@RequestMapping()
@Tag(
        name = "CRUD REST APIs for Post Resource"
)
public class PostController {

    private PostService postService;

    public PostController(PostService postService) {
        this.postService = postService;
    }

    @SecurityRequirement(name = "Bearer Authentication")
    @Operation(
            summary = "Create Post REST API",
            description = "Create Post REST API is used to save Post in database"
    )
    @ApiResponse(
            responseCode = "201",
            description = "HTTP Status 201 CREATED"
    )
    @PreAuthorize("hasRole('ADMIN')")
    // create blog post rest api
    @PostMapping("/api/v1/posts")
    public ResponseEntity<PostDto> createPost(@Valid @RequestBody PostDto postDto){
        return new ResponseEntity<>(postService.createPost(postDto), HttpStatus.CREATED);
    }

    @Operation(
            summary = "Get All Posts REST API",
            description = "Get All REST API is used to get all posts from database"
    )
    @ApiResponse(
            responseCode = "200",
            description = "HTTP Status 200 OK"
    )
    // get all posts rest api
    @GetMapping("/api/v1/posts")
    public PostResponse getAllPosts(
            @RequestParam(value = "pageNo", defaultValue = AppConstants.DEFAULT_PAGE_NUMBER, required = false) int pageNo,
            @RequestParam(value = "pageSize", defaultValue = AppConstants.DEFAULT_PAGE_SIZE, required = false) int pageSize,
            @RequestParam(value = "sortBy", defaultValue = AppConstants.DEFAULT_SORT_BY, required = false) String sortBy,
            @RequestParam(value = "sortDir", defaultValue = AppConstants.DEFAULT_SORT_DIRECTION, required = false) String sortDir
    ){
        return postService.getAllPosts(pageNo, pageSize, sortBy, sortDir);
    }

    @Operation(
            summary = "Get Post By Id REST API",
            description = "Get Post By Id REST API is used to get single post from database"
    )
    @ApiResponse(
            responseCode = "200",
            description = "HTTP Status 200 OK"
    )
    // get post by id
    @GetMapping(value = "/api/v1/posts/{id}")
    public ResponseEntity<PostDto> getPostByIdV1(@PathVariable(name = "id") long id){
        return ResponseEntity.ok(postService.getPostById(id));
    }

    @SecurityRequirement(name = "Bearer Authentication")
    @Operation(
            summary = "Update Post REST API",
            description = "Update Post REST API is used to update a particular post in a database"
    )
    @ApiResponse(
            responseCode = "200",
            description = "HTTP Status 200 OK"
    )
    @PreAuthorize("hasRole('ADMIN')")
    // update post by id rest api
    @PutMapping("/api/v1/posts/{id}")
    public ResponseEntity<PostDto> updatePost(@Valid @RequestBody PostDto postDto, @PathVariable(name = "id") long id){

        PostDto postResponse = postService.updatePost(postDto, id);

        return new ResponseEntity<>(postResponse, HttpStatus.OK);
    }

    @Operation(
            summary = "Delete Post REST API",
            description = "Delete Post REST API is used to delete a particular post in a database"
    )
    @ApiResponse(
            responseCode = "200",
            description = "HTTP Status 200 OK"
    )
    @SecurityRequirement(name = "Bearer Authentication")
    @PreAuthorize("hasRole('ADMIN')")
    // delete post rest api
    @DeleteMapping("/api/v1/posts/{id}")
    public ResponseEntity<String> deletePost(@PathVariable(name = "id") long id){

        postService.deletePostById(id);

        return new ResponseEntity<>("Post entity deleted successfully.", HttpStatus.OK);
    }

    @GetMapping("/api/v1/posts/category/{id}")
    public ResponseEntity<List<PostDto>> getPostsByCategory(
            @PathVariable(name = "id") Long id) {
        List<PostDto> response = postService.getPostsByCategory(id);
        return new ResponseEntity< >(response, HttpStatus.OK);
    }
}