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// Copyright 2018 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 parser // import "miniflux.app/reader/parser"
import (
"encoding/xml"
"strings"
"miniflux.app/reader/encoding"
)
// 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(data string) string {
if strings.HasPrefix(strings.TrimSpace(data), "{") {
return FormatJSON
}
decoder := xml.NewDecoder(strings.NewReader(data))
decoder.Entity = xml.HTMLEntity
decoder.CharsetReader = encoding.CharsetReader
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":
return FormatAtom
case "RDF":
return FormatRDF
}
}
}
return FormatUnknown
}
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