Add RSS feed generator

1 files changed, 63 insertions, 0 deletions

diff --git a/srv/src/http/feed.go b/srv/src/http/feed.go
new file mode 100644
index 0000000..8c0ef1c
--- /dev/null
+++ b/srv/src/http/feed.go
@@ -0,0 +1,63 @@
+package http
+
+import (
+	"fmt"
+	"net/http"
+	"path/filepath"
+
+	"github.com/gorilla/feeds"
+	"github.com/mediocregopher/blog.mediocregopher.com/srv/http/apiutil"
+)
+
+func (a *api) renderFeedHandler() http.Handler {
+
+	return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
+
+		author := &feeds.Author{
+			Name: "mediocregopher",
+		}
+
+		publicURL := a.params.PublicURL.String()
+
+		feed := feeds.Feed{
+			Title:       "Mediocre Blog",
+			Link:        &feeds.Link{Href: publicURL + "/"},
+			Description: "A mix of tech, art, travel, and who knows what else.",
+			Author:      author,
+		}
+
+		recentPosts, _, err := a.params.PostStore.WithOrderDesc().Get(0, 20)
+		if err != nil {
+			apiutil.InternalServerError(rw, r, fmt.Errorf("fetching recent posts: %w", err))
+			return
+		}
+
+		for _, post := range recentPosts {
+
+			if post.PublishedAt.After(feed.Updated) {
+				feed.Updated = post.PublishedAt
+			}
+
+			if post.LastUpdatedAt.After(feed.Updated) {
+				feed.Updated = post.LastUpdatedAt
+			}
+
+			postURL := publicURL + filepath.Join("/posts", post.ID)
+
+			feed.Items = append(feed.Items, &feeds.Item{
+				Title:       post.Title,
+				Link:        &feeds.Link{Href: postURL},
+				Author:      author,
+				Description: post.Description,
+				Id:          postURL,
+				Updated:     post.LastUpdatedAt,
+				Created:     post.PublishedAt,
+			})
+		}
+
+		if err := feed.WriteAtom(rw); err != nil {
+			apiutil.InternalServerError(rw, r, fmt.Errorf("writing atom feed: %w", err))
+			return
+		}
+	})
+}