rss/atom.go
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package rss
import (
"bytes"
"encoding/xml"
"fmt"
"time"
)
func parseAtom(data []byte) (*Feed, error) {
warnings := false
feed := atomFeed{}
p := xml.NewDecoder(bytes.NewReader(data))
p.Strict = false
p.CharsetReader = charsetReader
err := p.Decode(&feed)
if err != nil {
return nil, err
}
out := new(Feed)
out.Title = feed.Title
out.Description = feed.Description
for _, link := range feed.Link {
if link.Rel == "alternate" || link.Rel == "" {
out.Link = link.Href
break
}
}
out.Image = feed.Image.Image()
out.Refresh = time.Now().Add(DefaultRefreshInterval)
out.Items = make([]*Item, 0, len(feed.Items))
out.ItemMap = make(map[string]struct{})
// Process items.
for _, item := range feed.Items {
// Skip items already known.
if _, ok := out.ItemMap[item.ID]; ok {
continue
}
next := new(Item)
next.Title = item.Title
next.Summary = item.Summary
if item.Published != "" {
next.Date, err = parseTime(item.Published)
if err == nil {
next.DateValid = true
}
}
if item.Date != "" {
next.Date, err = parseTime(item.Date)
if err == nil {
next.DateValid = true
}
}
next.ID = item.ID
for _, link := range item.Links {
if link.Rel == "alternate" || link.Rel == "" {
next.Link = link.Href
} else {
next.Enclosures = append(next.Enclosures, &Enclosure{
URL: link.Href,
Type: link.Type,
Length: link.Length,
})
}
}
next.Read = false
if next.ID == "" {
if debug {
fmt.Printf("[w] Item %q has no ID and will be ignored.\n", next.Title)
fmt.Printf("[w] %#v\n", item)
}
warnings = true
continue
}
if _, ok := out.ItemMap[next.ID]; ok {
if debug {
fmt.Printf("[w] Item %q has duplicate ID.\n", next.Title)
fmt.Printf("[w] %#v\n", next)
}
warnings = true
continue
}
out.Items = append(out.Items, next)
out.ItemMap[next.ID] = struct{}{}
out.Unread++
}
if warnings && debug {
fmt.Printf("[i] Encountered warnings:\n%s\n", data)
}
return out, nil
}
type atomFeed struct {
XMLName xml.Name `xml:"feed"`
Title string `xml:"title"`
Description string `xml:"subtitle"`
Link []atomLink `xml:"link"`
Image atomImage `xml:"image"`
Items []atomItem `xml:"entry"`
Updated string `xml:"updated"`
}
type atomItem struct {
XMLName xml.Name `xml:"entry"`
Title string `xml:"title"`
Summary string `xml:"summary"`
Links []atomLink `xml:"link"`
Date string `xml:"updated"`
Published string `xml:"published"`
DateValid bool
ID string `xml:"id"`
}
type atomImage struct {
XMLName xml.Name `xml:"image"`
Title string `xml:"title"`
URL string `xml:"url"`
Height int `xml:"height"`
Width int `xml:"width"`
}
type atomLink struct {
Href string `xml:"href,attr"`
Rel string `xml:"rel,attr"`
Type string `xml:"type,attr"`
Length uint `xml:"length,attr"`
}
func (a *atomImage) Image() *Image {
out := new(Image)
out.Title = a.Title
out.URL = a.URL
out.Height = uint32(a.Height)
out.Width = uint32(a.Width)
return out
}