Function AuthWriteRangeRequest

plugins/authproxy/authproxy.cc:319–351

Transform the client request into a GET Range: bytes=0-0 request. This is useful for example of the authentication service is a caching proxy which might not cache HEAD requests.

// for example of the authentication service is a caching proxy which might not
// cache HEAD requests.
static bool
AuthWriteRangeRequest(AuthRequestContext *auth)
{
  HttpHeader rq;
  TSMBuffer  mbuf;
  TSMLoc     mhdr;

  TSReleaseAssert(TSHttpTxnClientReqGet(auth->txn, &mbuf, &mhdr) == TS_SUCCESS);

  // First, copy the whole client request to our new auth proxy request.
  TSReleaseAssert(TSHttpHdrCopy(rq.buffer, rq.header, mbuf, mhdr) == TS_SUCCESS);

  // Next, assure that the request to the auth server is a GET request, since we'll send a Range:
  if (TS_HTTP_METHOD_GET != auth->method) {
    TSReleaseAssert(TSHttpHdrMethodSet(rq.buffer, rq.header, TS_HTTP_METHOD_GET, -1) == TS_SUCCESS);
  }

  HttpSetMimeHeader(rq.buffer, rq.header, TS_MIME_FIELD_CONTENT_LENGTH, 0u);
  HttpSetMimeHeader(rq.buffer, rq.header, TS_MIME_FIELD_RANGE, "bytes=0-0");
  HttpSetMimeHeader(rq.buffer, rq.header, TS_MIME_FIELD_CACHE_CONTROL, "no-cache");

  HttpDebugHeader(rq.buffer, rq.header);

  // Serialize the HTTP request to the write IO buffer.
  TSHttpHdrPrint(rq.buffer, rq.header, auth->iobuf.buffer);

  // We have to tell the auth context not to try to ready the response
  // body, since we'are asking for a zero length Range.
  auth->read_body = false;

  TSHandleMLocRelease(mbuf, TS_NULL_MLOC, mhdr);
  return true;
}

// Transform the client request into a form that the auth proxy can consume and
// write it out.