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mediaapi/writers/upload: Explain the use of TeeReader

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This commit is contained in:
Robert Swain 2017-05-19 11:01:44 +02:00
parent f7d11f87c1
commit 12b0cdde06
1 changed files with 2 additions and 0 deletions
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src/github.com/matrix-org/dendrite/mediaapi/writers/upload.go
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@ -162,6 +162,8 @@ func writeFileWithLimitAndHash(r io.Reader, cfg *config.MediaAPI, logger *log.En
// integrity checks on the file data in the repository. The hash gets used as
// the MediaID.
hasher := sha256.New()
// A TeeReader is used to allow us to read from the limitedBody and simultaneously
// write to the hasher here and to the http.ResponseWriter via the io.Copy call below.
reader := io.TeeReader(limitedBody, hasher)
bytesWritten, err := io.Copy(writer, reader)