https://medium.com/canopas/automation-dynamic-sitemap-generation-with-golang-api-584f6c53ea9c - sitemap

sitemap.go

package sitemap

import (
	"encoding/xml"
	"jobs"
	"net/http"
	"time"

	"github.com/gin-gonic/gin"
)

type URL struct {
	XMLName    xml.Name `xml:"url"`
	Loc        string   `xml:"loc"`
	ChangeFreq string   `xml:"changefreq"`
	LastMod    string   `xml:"lastmod"`
	Priority   string   `xml:"priority"`
}

type URLset struct {
	XMLName xml.Name `xml:"urlset"`
	XMLNS   string   `xml:"xmlns,attr"`
	URL     []URL    `xml:"url"`
}

func (repository *SitemapRepository) GenerateSitemap(c *gin.Context) {
	baseUrl := c.Query("baseUrl")
	jobsUrl := baseUrl + '/jobs' 

        // Init all static urls for sitemap
	sitemapUrls := []URL{
	     {Loc: baseUrl, Priority: `1`},
	     {Loc: jobsUrl, Priority: `1`},
	}

	// Init all dynamic urls for sitemap
	jobs, err := GetJobs()
	for i := range jobs {
	    sitemapUrls = append(sitemapUrls, URL{Loc: jobsUrl + `/` + jobs[i].Id, Priority: `0.9`})
	}

	// Add changefreq and lastmod to all urls
	year, month, _ := time.Now().Date()   //get current month and year
	lastmod := time.Date(year, month, 1, 0, 0, 0, 0, time.UTC).Format("2006-01-02T00:00:00.000Z")

	for i := range sitemapUrls {
	     sitemapUrls[i].ChangeFreq = "monthly"
	     sitemapUrls[i].LastMod = lastmod
	}

	urlset := URLset{URL: sitemapUrls, XMLNS: "http://www.sitemaps.org/schemas/sitemap/0.9"}

	c.Header("Content-Type", "application/xml")
 
	c.XML(http.StatusOK, urlset)
}