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// SPDX-FileCopyrightText: Copyright The Miniflux Authors. All rights reserved.
// SPDX-License-Identifier: Apache-2.0
package parser // import "miniflux.app/v2/internal/reader/parser"
import (
"bytes"
"encoding/xml"
"io"
rxml "miniflux.app/v2/internal/reader/xml"
)
// List of feed formats.
const (
FormatRDF = "rdf"
FormatRSS = "rss"
FormatAtom = "atom"
FormatJSON = "json"
FormatUnknown = "unknown"
)
// DetectFeedFormat tries to guess the feed format from input data.
func DetectFeedFormat(r io.ReadSeeker) (string, string) {
data := make([]byte, 512)
r.Read(data)
if bytes.HasPrefix(bytes.TrimSpace(data), []byte("{")) {
return FormatJSON, ""
}
r.Seek(0, io.SeekStart)
decoder := rxml.NewXMLDecoder(r)
for {
token, _ := decoder.Token()
if token == nil {
break
}
if element, ok := token.(xml.StartElement); ok {
switch element.Name.Local {
case "rss":
return FormatRSS, ""
case "feed":
for _, attr := range element.Attr {
if attr.Name.Local == "version" && attr.Value == "0.3" {
return FormatAtom, "0.3"
}
}
return FormatAtom, "1.0"
case "RDF":
return FormatRDF, ""
}
}
}
return FormatUnknown, ""
}
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