713b38e34c
- Feeds with charset specified only in Content-Type header and not in XML document - Feeds with charset specified in both places - Feeds with charset specified only in XML document and not in HTTP header
38 lines
1.1 KiB
Go
38 lines
1.1 KiB
Go
// 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 encoding
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import (
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"bytes"
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"io"
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"unicode/utf8"
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"golang.org/x/net/html/charset"
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)
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// CharsetReader is used when the XML encoding is specified for the input document.
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//
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// The document is converted in UTF-8 only if a different encoding is specified
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// and the document is not already UTF-8.
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//
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// Several edge cases could exists:
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//
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// - Feeds with charset specified only in Content-Type header and not in XML document
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// - Feeds with charset specified in both places
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// - Feeds with charset specified only in XML document and not in HTTP header
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func CharsetReader(label string, input io.Reader) (io.Reader, error) {
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var buf1, buf2 bytes.Buffer
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w := io.MultiWriter(&buf1, &buf2)
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io.Copy(w, input)
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r := bytes.NewReader(buf2.Bytes())
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if !utf8.Valid(buf1.Bytes()) {
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// Transform document to UTF-8 from the specified XML encoding.
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return charset.NewReaderLabel(label, r)
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}
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// The document is already UTF-8, do not do anything (avoid double-encoding)
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return r, nil
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}
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