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// Copyright 2017 Frédéric Guillot. All rights reserved.
// Use of this source code is governed by the Apache 2.0
// license that can be found in the LICENSE file.
package atom // import "miniflux.app/reader/atom"
import (
"bytes"
"encoding/xml"
"io"
"miniflux.app/errors"
"miniflux.app/model"
xml_decoder "miniflux.app/reader/xml"
)
type atomFeed interface {
Transform() *model.Feed
}
// Parse returns a normalized feed struct from a Atom feed.
func Parse(r io.Reader) (*model.Feed, *errors.LocalizedError) {
var buf bytes.Buffer
tee := io.TeeReader(r, &buf)
var rawFeed atomFeed
if getAtomFeedVersion(tee) == "0.3" {
rawFeed = new(atom03Feed)
} else {
rawFeed = new(atom10Feed)
}
decoder := xml_decoder.NewDecoder(&buf)
err := decoder.Decode(rawFeed)
if err != nil {
return nil, errors.NewLocalizedError("Unable to parse Atom feed: %q", err)
}
return rawFeed.Transform(), nil
}
func getAtomFeedVersion(data io.Reader) string {
decoder := xml_decoder.NewDecoder(data)
for {
token, _ := decoder.Token()
if token == nil {
break
}
if element, ok := token.(xml.StartElement); ok {
if element.Name.Local == "feed" {
for _, attr := range element.Attr {
if attr.Name.Local == "version" && attr.Value == "0.3" {
return "0.3"
}
}
return "1.0"
}
}
}
return "1.0"
}
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