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