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package proxy
import (
"bytes"
"io"
"net/http"
)
// cappedTee wraps an io.Reader, copying up to maxCaptureBytes of what
// passes through into an internal buffer while still passing everything
// through unmodified and unbounded to the real reader. Used to capture a
// bounded sample of a body for reconstruction when exact wire capture
// isn't available (the HTTP/2 leg - see below).
type cappedTee struct {
r io.Reader
buf bytes.Buffer
}
func newCappedTee(r io.Reader) *cappedTee {
return &cappedTee{r: r}
}
func (c *cappedTee) Read(p []byte) (int, error) {
n, err := c.r.Read(p)
if n > 0 {
if room := maxCaptureBytes - c.buf.Len(); room > 0 {
end := n
if end > room {
end = room
}
c.buf.Write(p[:end])
}
}
return n, err
}
// captureRequest returns the raw bytes of r for storage. When tee is
// non-nil (an HTTP/1.1 client connection), the bytes are exactly what
// was read off the wire, unless truncated hits maxCaptureBytes and has
// to drop bytes off the end - still real wire bytes, just incomplete,
// which is a different (and less severe) kind of "not exact" than the
// HTTP/2 case below and worth telling apart in the UI (see
// store.Entry's *Truncated fields). Otherwise (HTTP/2, which has no
// single "raw bytes" representation - it's multiplexed, HPACK-
// compressed framing) it's a reconstruction from the parsed request,
// exact=false, truncated=false (truncated only applies to a would-be-
// exact capture).
func captureRequest(r *http.Request, tee *teeConn, bodyCap *cappedTee) (raw []byte, exact, truncated bool) {
if tee != nil {
data, truncated := tee.Take()
return data, !truncated, truncated
}
dump := r.Clone(r.Context())
if bodyCap != nil {
dump.Body = io.NopCloser(bytes.NewReader(bodyCap.buf.Bytes()))
dump.ContentLength = int64(bodyCap.buf.Len())
} else {
dump.Body = http.NoBody
dump.ContentLength = 0
}
var buf bytes.Buffer
if err := dump.Write(&buf); err != nil {
return nil, false, false
}
return buf.Bytes(), false, false
}
// captureResponse reconstructs raw response bytes from the parsed
// response for the HTTP/2 upstream case - the exact-capture path
// (HTTP/1.1 upstream) is handled directly in forward() via the
// teeConn's own Take(), which is the only reason this one doesn't also
// need a *teeConn parameter.
func captureResponse(resp *http.Response, bodyCap *cappedTee) (raw []byte, exact bool) {
dump := *resp
if bodyCap != nil {
dump.Body = io.NopCloser(bytes.NewReader(bodyCap.buf.Bytes()))
dump.ContentLength = int64(bodyCap.buf.Len())
} else {
dump.Body = http.NoBody
dump.ContentLength = 0
}
var buf bytes.Buffer
if err := dump.Write(&buf); err != nil {
return nil, false
}
return buf.Bytes(), false
}
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