54 lines
1 KiB
Go
54 lines
1 KiB
Go
// 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 {
|
|
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":
|
|
return FormatAtom
|
|
case "RDF":
|
|
return FormatRDF
|
|
}
|
|
}
|
|
}
|
|
|
|
return FormatUnknown
|
|
}
|