feat(seo): add sitemap generator

internal/handler/sitemap.go

@@ -0,0 +1,34 @@
+package handler
+
+import (
+	"context"
+	"net/http"
+	"time"
+
+	"github.com/prabhupadasays/spsays-bff/internal/repository"
+	"github.com/prabhupadasays/spsays-bff/pkg/response"
+)
+
+// SitemapHandler serves the flat list of public content URLs the frontend
+// turns into sitemap XML. Public + heavily cached on the frontend (daily
+// ISR), so this expensive-ish sweep runs ~once/day, never per crawler request.
+type SitemapHandler struct{ repo *repository.SitemapRepo }
+
+func NewSitemapHandler(repo *repository.SitemapRepo) *SitemapHandler {
+	return &SitemapHandler{repo: repo}
+}
+
+// GetContent — GET /sitemap/content → { "urls": ["/books/bg/1/1", …] }.
+func (h *SitemapHandler) GetContent(w http.ResponseWriter, r *http.Request) {
+	// The sweep touches tens of thousands of docs across several collections;
+	// give it room but bound it so a stuck query can't hang the handler.
+	ctx, cancel := context.WithTimeout(r.Context(), 90*time.Second)
+	defer cancel()
+
+	urls, err := h.repo.ContentURLs(ctx)
+	if err != nil {
+		response.Error(w, http.StatusInternalServerError, "could not build sitemap")
+		return
+	}
+	response.JSON(w, http.StatusOK, map[string]any{"urls": urls})
+}