27 lines
345 B
Go
27 lines
345 B
Go
package layer
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import (
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"io"
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"net/http"
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"sync"
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)
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type detector struct {
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io.Reader
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sync.Once
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contentType string
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}
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func newDetector(r io.Reader) *detector {
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return &detector{Reader: r}
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}
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func (d *detector) Read(data []byte) (int, error) {
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d.Do(func() {
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d.contentType = http.DetectContentType(data)
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})
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return d.Reader.Read(data)
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}
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