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// Copyright 2019 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 xml // import "miniflux.app/reader/xml"
import (
"bytes"
"encoding/xml"
"fmt"
"io"
"io/ioutil"
"miniflux.app/reader/encoding"
)
// NewDecoder returns a XML decoder that filters illegal characters.
func NewDecoder(data io.Reader) *xml.Decoder {
decoder := xml.NewDecoder(data)
decoder.Entity = xml.HTMLEntity
decoder.Strict = false
decoder.CharsetReader = func(charset string, input io.Reader) (io.Reader, error) {
utf8Reader, err := encoding.CharsetReader(charset, input)
if err != nil {
return nil, err
}
rawData, err := ioutil.ReadAll(utf8Reader)
if err != nil {
return nil, fmt.Errorf("Unable to read data: %q", err)
}
filteredBytes := bytes.Map(filterValidXMLChar, rawData)
return bytes.NewReader(filteredBytes), nil
}
return decoder
}
// This function is copied from encoding/xml package,
// and is used to check if all the characters are legal.
func filterValidXMLChar(r rune) rune {
if r == 0x09 ||
r == 0x0A ||
r == 0x0D ||
r >= 0x20 && r <= 0xD7FF ||
r >= 0xE000 && r <= 0xFFFD ||
r >= 0x10000 && r <= 0x10FFFF {
return r
}
return -1
}
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