52 lines
1 KiB
Go
52 lines
1 KiB
Go
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// Copyright 2018 Frédéric Guillot. All rights reserved.
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// Use of this source code is governed by the Apache 2.0
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// license that can be found in the LICENSE file.
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package parser // import "miniflux.app/reader/parser"
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import (
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"encoding/xml"
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"strings"
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"miniflux.app/reader/encoding"
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)
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// List of feed formats.
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const (
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FormatRDF = "rdf"
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FormatRSS = "rss"
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FormatAtom = "atom"
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FormatJSON = "json"
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FormatUnknown = "unknown"
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)
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// DetectFeedFormat tries to guess the feed format from input data.
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func DetectFeedFormat(data string) string {
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if strings.HasPrefix(strings.TrimSpace(data), "{") {
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return FormatJSON
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}
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decoder := xml.NewDecoder(strings.NewReader(data))
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decoder.CharsetReader = encoding.CharsetReader
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for {
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token, _ := decoder.Token()
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if token == nil {
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break
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}
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if element, ok := token.(xml.StartElement); ok {
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switch element.Name.Local {
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case "rss":
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return FormatRSS
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case "feed":
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return FormatAtom
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case "RDF":
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return FormatRDF
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}
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}
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}
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return FormatUnknown
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}
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