147 lines
4.3 KiB
Go
147 lines
4.3 KiB
Go
package feeds
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// rss support
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// validation done according to spec here:
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// http://cyber.law.harvard.edu/rss/rss.html
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import (
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"encoding/xml"
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"fmt"
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"strconv"
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"time"
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)
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// private wrapper around the RssFeed which gives us the <rss>..</rss> xml
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type rssFeedXml struct {
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XMLName xml.Name `xml:"rss"`
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Version string `xml:"version,attr"`
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Channel *RssFeed
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}
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type RssImage struct {
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XMLName xml.Name `xml:"image"`
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Url string `xml:"url"`
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Title string `xml:"title"`
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Link string `xml:"link"`
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Width int `xml:"width,omitempty"`
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Height int `xml:"height,omitempty"`
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}
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type RssTextInput struct {
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XMLName xml.Name `xml:"textInput"`
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Title string `xml:"title"`
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Description string `xml:"description"`
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Name string `xml:"name"`
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Link string `xml:"link"`
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}
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type RssFeed struct {
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XMLName xml.Name `xml:"channel"`
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Title string `xml:"title"` // required
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Link string `xml:"link"` // required
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Description string `xml:"description"` // required
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Language string `xml:"language,omitempty"`
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Copyright string `xml:"copyright,omitempty"`
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ManagingEditor string `xml:"managingEditor,omitempty"` // Author used
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WebMaster string `xml:"webMaster,omitempty"`
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PubDate string `xml:"pubDate,omitempty"` // created or updated
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LastBuildDate string `xml:"lastBuildDate,omitempty"` // updated used
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Category string `xml:"category,omitempty"`
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Generator string `xml:"generator,omitempty"`
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Docs string `xml:"docs,omitempty"`
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Cloud string `xml:"cloud,omitempty"`
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Ttl int `xml:"ttl,omitempty"`
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Rating string `xml:"rating,omitempty"`
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SkipHours string `xml:"skipHours,omitempty"`
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SkipDays string `xml:"skipDays,omitempty"`
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Image *RssImage
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TextInput *RssTextInput
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Items []*RssItem
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}
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type RssItem struct {
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XMLName xml.Name `xml:"item"`
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Title string `xml:"title"` // required
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Link string `xml:"link"` // required
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Description string `xml:"description"` // required
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Author string `xml:"author,omitempty"`
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Category string `xml:"category,omitempty"`
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Comments string `xml:"comments,omitempty"`
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Enclosure *RssEnclosure
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Guid string `xml:"guid,omitempty"` // Id used
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PubDate string `xml:"pubDate,omitempty"` // created or updated
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Source string `xml:"source,omitempty"`
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}
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type RssEnclosure struct {
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//RSS 2.0 <enclosure url="http://example.com/file.mp3" length="123456789" type="audio/mpeg" />
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XMLName xml.Name `xml:"enclosure"`
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Url string `xml:"url,attr"`
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Length string `xml:"length,attr"`
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Type string `xml:"type,attr"`
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}
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type Rss struct {
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*Feed
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}
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// create a new RssItem with a generic Item struct's data
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func newRssItem(i *Item) *RssItem {
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item := &RssItem{
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Title: i.Title,
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Link: i.Link.Href,
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Description: i.Description,
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Guid: i.Id,
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PubDate: anyTimeFormat(time.RFC1123Z, i.Created, i.Updated),
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}
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intLength, err := strconv.ParseInt(i.Link.Length, 10, 64)
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if err == nil && (intLength > 0 || i.Link.Type != "") {
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item.Enclosure = &RssEnclosure{Url: i.Link.Href, Type: i.Link.Type, Length: i.Link.Length}
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}
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if i.Author != nil {
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item.Author = i.Author.Name
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}
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return item
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}
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// create a new RssFeed with a generic Feed struct's data
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func (r *Rss) RssFeed() *RssFeed {
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pub := anyTimeFormat(time.RFC1123Z, r.Created, r.Updated)
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build := anyTimeFormat(time.RFC1123Z, r.Updated)
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author := ""
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if r.Author != nil {
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author = r.Author.Email
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if len(r.Author.Name) > 0 {
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author = fmt.Sprintf("%s (%s)", r.Author.Email, r.Author.Name)
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}
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}
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channel := &RssFeed{
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Title: r.Title,
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Link: r.Link.Href,
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Description: r.Description,
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ManagingEditor: author,
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PubDate: pub,
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LastBuildDate: build,
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Copyright: r.Copyright,
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}
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for _, i := range r.Items {
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channel.Items = append(channel.Items, newRssItem(i))
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}
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return channel
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}
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// return an XML-Ready object for an Rss object
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func (r *Rss) FeedXml() interface{} {
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// only generate version 2.0 feeds for now
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return r.RssFeed().FeedXml()
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}
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// return an XML-ready object for an RssFeed object
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func (r *RssFeed) FeedXml() interface{} {
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return &rssFeedXml{Version: "2.0", Channel: r}
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}
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