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// SPDX-FileCopyrightText: Copyright The Miniflux Authors. All rights reserved.
// SPDX-License-Identifier: Apache-2.0
package atom // import "miniflux.app/v2/internal/reader/atom"
import (
"bytes"
"encoding/xml"
"fmt"
"io"
"miniflux.app/v2/internal/model"
xml_decoder "miniflux.app/v2/internal/reader/xml"
)
type atomFeed interface {
Transform(baseURL string) *model.Feed
}
// Parse returns a normalized feed struct from a Atom feed.
func Parse(baseURL string, r io.Reader) (*model.Feed, error) {
var buf bytes.Buffer
tee := io.TeeReader(r, &buf)
var rawFeed atomFeed
if getAtomFeedVersion(tee) == "0.3" {
rawFeed = new(atom03Feed)
} else {
rawFeed = new(atom10Feed)
}
if err := xml_decoder.NewXMLDecoder(&buf).Decode(rawFeed); err != nil {
return nil, fmt.Errorf("atom: unable to parse feed: %w", err)
}
return rawFeed.Transform(baseURL), nil
}
func getAtomFeedVersion(data io.Reader) string {
decoder := xml_decoder.NewXMLDecoder(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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