components/variations/net/variations_http_headers.h

// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef COMPONENTS_VARIATIONS_NET_VARIATIONS_HTTP_HEADERS_H_
#define COMPONENTS_VARIATIONS_NET_VARIATIONS_HTTP_HEADERS_H_

#include <set>
#include <string>

namespace net {
class HttpRequestHeaders;
}

class GURL;

namespace variations {

// Adds Chrome experiment and metrics state as custom headers to |headers|.
// The content of the headers will depend on |incognito|, |uma_enabled| and
// |is_signed_in| parameters. It is fine to pass false for |is_signed_in| if the
// state is not known to the caller. This will prevent addition of ids of type
// GOOGLE_WEB_PROPERTIES_SIGNED_IN, which is not the case for any ids that come
// from the variations server. These headers are never transmitted to non-Google
// web sites, which is checked based on the destination |url|.
void AppendVariationHeaders(const GURL& url,
                            bool incognito,
                            bool uma_enabled,
                            bool is_signed_in,
                            net::HttpRequestHeaders* headers);

// Returns the HTTP header names which are added by AppendVariationHeaders().
std::set<std::string> GetVariationHeaderNames();

namespace internal {

// Checks whether variation headers should be appended to requests to the
// specified |url|. Returns true for google.<TLD> and youtube.<TLD> URLs.
bool ShouldAppendVariationHeaders(const GURL& url);

}  // namespace internal

}  // namespace variations

#endif  // COMPONENTS_VARIATIONS_NET_VARIATIONS_HTTP_HEADERS_H_