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Copyright (c) 2014, 2015, 2016 Carl Jackson (carl@avtok.com) | ||
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MIT License | ||
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Permission is hereby granted, free of charge, to any person obtaining a copy of | ||
this software and associated documentation files (the "Software"), to deal in | ||
the Software without restriction, including without limitation the rights to | ||
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of | ||
the Software, and to permit persons to whom the Software is furnished to do so, | ||
subject to the following conditions: | ||
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The above copyright notice and this permission notice shall be included in all | ||
copies or substantial portions of the Software. | ||
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS | ||
FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR | ||
COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER | ||
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | ||
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
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// Package mutil contains various functions that are helpful when writing http | ||
// middleware. | ||
// | ||
// It has been vendored from Goji v1.0, with the exception of the code for Go 1.8: | ||
// https://github.com/zenazn/goji/ | ||
package mutil |
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package mutil | ||
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import ( | ||
"bufio" | ||
"io" | ||
"net" | ||
"net/http" | ||
) | ||
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// WriterProxy is a proxy around an http.ResponseWriter that allows you to hook | ||
// into various parts of the response process. | ||
type WriterProxy interface { | ||
http.ResponseWriter | ||
// Status returns the HTTP status of the request, or 0 if one has not | ||
// yet been sent. | ||
Status() int | ||
// BytesWritten returns the total number of bytes sent to the client. | ||
BytesWritten() int | ||
// Tee causes the response body to be written to the given io.Writer in | ||
// addition to proxying the writes through. Only one io.Writer can be | ||
// tee'd to at once: setting a second one will overwrite the first. | ||
// Writes will be sent to the proxy before being written to this | ||
// io.Writer. It is illegal for the tee'd writer to be modified | ||
// concurrently with writes. | ||
Tee(io.Writer) | ||
// Unwrap returns the original proxied target. | ||
Unwrap() http.ResponseWriter | ||
} | ||
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// WrapWriter wraps an http.ResponseWriter, returning a proxy that allows you to | ||
// hook into various parts of the response process. | ||
func WrapWriter(w http.ResponseWriter) WriterProxy { | ||
_, cn := w.(http.CloseNotifier) | ||
_, fl := w.(http.Flusher) | ||
_, hj := w.(http.Hijacker) | ||
_, rf := w.(io.ReaderFrom) | ||
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bw := basicWriter{ResponseWriter: w} | ||
if cn && fl && hj && rf { | ||
return &fancyWriter{bw} | ||
} | ||
if fl { | ||
return &flushWriter{bw} | ||
} | ||
return &bw | ||
} | ||
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// basicWriter wraps a http.ResponseWriter that implements the minimal | ||
// http.ResponseWriter interface. | ||
type basicWriter struct { | ||
http.ResponseWriter | ||
wroteHeader bool | ||
code int | ||
bytes int | ||
tee io.Writer | ||
} | ||
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func (b *basicWriter) WriteHeader(code int) { | ||
if !b.wroteHeader { | ||
b.code = code | ||
b.wroteHeader = true | ||
b.ResponseWriter.WriteHeader(code) | ||
} | ||
} | ||
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func (b *basicWriter) Write(buf []byte) (int, error) { | ||
b.WriteHeader(http.StatusOK) | ||
n, err := b.ResponseWriter.Write(buf) | ||
if b.tee != nil { | ||
_, err2 := b.tee.Write(buf[:n]) | ||
// Prefer errors generated by the proxied writer. | ||
if err == nil { | ||
err = err2 | ||
} | ||
} | ||
b.bytes += n | ||
return n, err | ||
} | ||
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func (b *basicWriter) maybeWriteHeader() { | ||
if !b.wroteHeader { | ||
b.WriteHeader(http.StatusOK) | ||
} | ||
} | ||
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func (b *basicWriter) Status() int { | ||
return b.code | ||
} | ||
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func (b *basicWriter) BytesWritten() int { | ||
return b.bytes | ||
} | ||
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func (b *basicWriter) Tee(w io.Writer) { | ||
b.tee = w | ||
} | ||
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func (b *basicWriter) Unwrap() http.ResponseWriter { | ||
return b.ResponseWriter | ||
} | ||
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// fancyWriter is a writer that additionally satisfies http.CloseNotifier, | ||
// http.Flusher, http.Hijacker, and io.ReaderFrom. It exists for the common case | ||
// of wrapping the http.ResponseWriter that package http gives you, in order to | ||
// make the proxied object support the full method set of the proxied object. | ||
type fancyWriter struct { | ||
basicWriter | ||
} | ||
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func (f *fancyWriter) CloseNotify() <-chan bool { | ||
cn := f.basicWriter.ResponseWriter.(http.CloseNotifier) | ||
return cn.CloseNotify() | ||
} | ||
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func (f *fancyWriter) Flush() { | ||
fl := f.basicWriter.ResponseWriter.(http.Flusher) | ||
fl.Flush() | ||
} | ||
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func (f *fancyWriter) Hijack() (net.Conn, *bufio.ReadWriter, error) { | ||
hj := f.basicWriter.ResponseWriter.(http.Hijacker) | ||
return hj.Hijack() | ||
} | ||
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func (f *fancyWriter) ReadFrom(r io.Reader) (int64, error) { | ||
if f.basicWriter.tee != nil { | ||
return io.Copy(&f.basicWriter, r) | ||
} | ||
rf := f.basicWriter.ResponseWriter.(io.ReaderFrom) | ||
f.basicWriter.maybeWriteHeader() | ||
return rf.ReadFrom(r) | ||
} | ||
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type flushWriter struct { | ||
basicWriter | ||
} | ||
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func (f *flushWriter) Flush() { | ||
fl := f.basicWriter.ResponseWriter.(http.Flusher) | ||
fl.Flush() | ||
} | ||
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var ( | ||
_ http.CloseNotifier = &fancyWriter{} | ||
_ http.Flusher = &fancyWriter{} | ||
_ http.Hijacker = &fancyWriter{} | ||
_ io.ReaderFrom = &fancyWriter{} | ||
_ http.Flusher = &flushWriter{} | ||
) |