OpenIsle/backend/src/main/java/com/openisle/controller/SitemapController.java

package com.openisle.controller;

import com.openisle.model.Post;
import com.openisle.model.PostStatus;
import com.openisle.repository.PostRepository;
import io.swagger.v3.oas.annotations.Operation;
import io.swagger.v3.oas.annotations.media.Content;
import io.swagger.v3.oas.annotations.media.Schema;
import io.swagger.v3.oas.annotations.responses.ApiResponse;
import java.util.List;
import lombok.RequiredArgsConstructor;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * Controller for dynamic sitemap generation.
 */
@RestController
@RequiredArgsConstructor
@RequestMapping("/api")
public class SitemapController {

  private final PostRepository postRepository;

  @Value("${app.website-url}")
  private String websiteUrl;

  @GetMapping(value = "/sitemap.xml", produces = MediaType.APPLICATION_XML_VALUE)
  @Operation(summary = "Sitemap", description = "Generate sitemap xml")
  @ApiResponse(
    responseCode = "200",
    description = "Sitemap xml",
    content = @Content(schema = @Schema(implementation = String.class))
  )
  public ResponseEntity<String> sitemap() {
    List<Post> posts = postRepository.findByStatus(PostStatus.PUBLISHED);

    StringBuilder body = new StringBuilder();
    body.append("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n");
    body.append("<urlset xmlns=\"http://www.sitemaps.org/schemas/sitemap/0.9\">\n");

    List<String> staticRoutes = List.of("/", "/about", "/activities", "/login", "/signup");

    for (String path : staticRoutes) {
      body.append("  <url><loc>").append(websiteUrl).append(path).append("</loc></url>\n");
    }

    for (Post p : posts) {
      body
        .append("  <url>\n")
        .append("    <loc>")
        .append(websiteUrl)
        .append("/posts/")
        .append(p.getId())
        .append("</loc>\n")
        .append("    <lastmod>")
        .append(p.getCreatedAt().toLocalDate())
        .append("</lastmod>\n")
        .append("  </url>\n");
    }

    body.append("</urlset>");
    return ResponseEntity.ok().contentType(MediaType.APPLICATION_XML).body(body.toString());
  }
}