91 lines
1.9 KiB
Go
91 lines
1.9 KiB
Go
// Copyright 2017 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 feed
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import (
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"bytes"
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"encoding/xml"
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"errors"
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"io"
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"strings"
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"time"
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"github.com/miniflux/miniflux2/helper"
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"github.com/miniflux/miniflux2/model"
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"github.com/miniflux/miniflux2/reader/atom"
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"github.com/miniflux/miniflux2/reader/json"
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"github.com/miniflux/miniflux2/reader/rdf"
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"github.com/miniflux/miniflux2/reader/rss"
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"golang.org/x/net/html/charset"
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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 detect feed format from input data.
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func DetectFeedFormat(data io.Reader) string {
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defer helper.ExecutionTime(time.Now(), "[Feed:DetectFeedFormat]")
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var buffer bytes.Buffer
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tee := io.TeeReader(data, &buffer)
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decoder := xml.NewDecoder(tee)
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decoder.CharsetReader = charset.NewReaderLabel
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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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if strings.HasPrefix(strings.TrimSpace(buffer.String()), "{") {
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return FormatJSON
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}
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return FormatUnknown
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}
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func parseFeed(data io.Reader) (*model.Feed, error) {
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defer helper.ExecutionTime(time.Now(), "[Feed:ParseFeed]")
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var buffer bytes.Buffer
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io.Copy(&buffer, data)
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reader := bytes.NewReader(buffer.Bytes())
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format := DetectFeedFormat(reader)
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reader.Seek(0, io.SeekStart)
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switch format {
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case FormatAtom:
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return atom.Parse(reader)
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case FormatRSS:
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return rss.Parse(reader)
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case FormatJSON:
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return json.Parse(reader)
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case FormatRDF:
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return rdf.Parse(reader)
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default:
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return nil, errors.New("Unsupported feed format")
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}
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}
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