Add RSS/Sitemap handling.

server/utils/rss.go

@@ -0,0 +1,49 @@
+package utils
+
+import (
+	"github.com/gofiber/fiber/v3/log"
+	"net/url"
+	"nysoure/server/model"
+	"os"
+	"path/filepath"
+	"strconv"
+	"strings"
+)
+
+const (
+	RssFileName = "rss.xml"
+)
+
+func GenerateRss(baseURL string, resources []model.Resource) {
+	path := filepath.Join(GetStoragePath(), RssFileName)
+	builder := strings.Builder{}
+	builder.WriteString(`<?xml version="1.0" encoding="UTF-8"?>`)
+	builder.WriteRune('\n')
+	builder.WriteString(`<rss version="2.0">`)
+	builder.WriteRune('\n')
+	builder.WriteString(`<channel>`)
+	builder.WriteRune('\n')
+	for _, resource := range resources {
+		builder.WriteString("  <item>\n")
+		builder.WriteString("    <title>")
+		builder.WriteString(url.PathEscape(resource.Title))
+		builder.WriteString("</title>\n")
+		builder.WriteString("    <link>")
+		builder.WriteString(baseURL + "/resources/" + strconv.Itoa(int(resource.ID)))
+		builder.WriteString("</link>\n")
+		builder.WriteString("    <description>")
+		builder.WriteString(url.PathEscape(ArticleToDescription(resource.Article, 255)))
+		builder.WriteString("</description>\n")
+		builder.WriteString("    <pubDate>")
+		builder.WriteString(resource.UpdatedAt.Format("Mon, 02 Jan 2006 15:04:05 MST"))
+		builder.WriteString("</pubDate>\n")
+		builder.WriteString("  </item>\n")
+	}
+	builder.WriteString(`</channel>`)
+	builder.WriteRune('\n')
+	builder.WriteString(`</rss>`)
+	data := builder.String()
+	if err := os.WriteFile(path, []byte(data), 0644); err != nil {
+		log.Error("failed to write RSS file", err)
+	}
+}