basic json feed parser

src/feed/json.go

@@ -0,0 +1,77 @@
+package feed
+
+import (
+	"encoding/json"
+	"io"
+)
+
+type jsonFeed struct {
+	Version string     `json:"version"`
+	Title   string     `json:"title"`
+	SiteURL string     `json:"home_page_url"`
+	FeedURL string     `json:"feed_url"`
+	Items   []jsonItem `json:"items"`
+}
+
+type jsonItem struct {
+	ID            string           `json:"id"`
+	URL           string           `json:"url"`
+	Title         string           `json:"title"`
+	Summary       string           `json:"summary"`
+	Text          string           `json:"content_text"`
+	HTML          string           `json:"content_html"`
+	DatePublished string           `json:"date_published"`
+	DateModified  string           `json:"date_modified"`
+	Attachments   []jsonAttachment `json:"attachments"`
+}
+
+type jsonAttachment struct {
+	URL      string `json:"url"`
+	MimeType string `json:"mime_type"`
+	Title    string `json:"title"`
+	Size     int64  `json:"size_in_bytes"`
+	Duration int    `json:"duration_in_seconds"`
+}
+
+func first(vals ...string) string {
+	for _, val := range vals {
+		if len(val) > 0 {
+			return val
+		}
+	}
+	return ""
+}
+
+func (f *jsonFeed) convert(base string) *Feed {
+	feed := &Feed{
+		Title: f.Title,
+		SiteURL: f.SiteURL,
+		FeedURL: f.FeedURL,
+	}
+	for _, item := range f.Items {
+		//date := item.DatePublished
+		content := first(item.HTML, item.Text, item.Summary)
+		imageUrl := ""
+		podcastUrl := ""
+	
+		feed.Items = append(feed.Items, Item{
+			GUID: item.ID,
+			Date: nil,
+			URL:  item.URL,
+			Title: item.Title,
+			Content: content,
+			ImageURL: imageUrl,
+			PodcastURL: podcastUrl,
+		})
+	}
+	return feed
+}
+
+func ParseJSON(data io.Reader, base string) (*Feed, error) {
+	feed := new(jsonFeed)
+	decoder := json.NewDecoder(data)
+	if err := decoder.Decode(&feed); err != nil {
+		return nil, err
+	}
+	return feed.convert(base), nil
+}