Add function to fetch and parse RSS feed

rss.go

@@ -0,0 +1,45 @@
+package sn
+
+import (
+	"encoding/xml"
+	"fmt"
+	"log"
+	"net/http"
+	"time"
+)
+
+func (c *RssDate) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
+	var v string
+	dateFormat := "Mon, 02 Jan 2006 15:04:05 GMT"
+	d.DecodeElement(&v, &start)
+	parse, err := time.Parse(dateFormat, v)
+	if err != nil {
+		return err
+	}
+	*c = RssDate{parse}
+	return nil
+}
+
+var (
+	StackerNewsRssFeedUrl = "https://stacker.news/rss"
+)
+
+// Fetch RSS feed
+func RssFeed() (*Rss, error) {
+	resp, err := http.Get(StackerNewsRssFeedUrl)
+	if err != nil {
+		err = fmt.Errorf("error fetching RSS feed: %w", err)
+		log.Println(err)
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	var rss Rss
+	err = xml.NewDecoder(resp.Body).Decode(&rss)
+	if err != nil {
+		err = fmt.Errorf("error decoding RSS feed XML: %w", err)
+		return nil, err
+	}
+
+	return &rss, nil
+}

types.go

@@ -91,3 +91,32 @@ type DupesError struct {
 func (e *DupesError) Error() string {
 	return fmt.Sprintf("found %d dupes for %s", len(e.Dupes), e.Url)
 }
+
+type RssItem struct {
+	Guid        string    `xml:"guid"`
+	Title       string    `xml:"title"`
+	Link        string    `xml:"link"`
+	Description string    `xml:"description"`
+	PubDate     RssDate   `xml:"pubDate"`
+	Author      RssAuthor `xml:"author"`
+}
+
+type RssChannel struct {
+	Title         string    `xml:"title"`
+	Description   string    `xml:"description"`
+	Link          string    `xml:"link"`
+	Items         []RssItem `xml:"item"`
+	LastBuildDate RssDate   `xml:"lastBuildDate"`
+}
+
+type Rss struct {
+	Channel RssChannel `xml:"channel"`
+}
+
+type RssDate struct {
+	time.Time
+}
+
+type RssAuthor struct {
+	Name string `xml:"name"`
+}