components: add wifi_sync component

components/wifi_sync/wifi_credential.h

Index: components/wifi_sync/wifi_credential.h
diff --git a/components/wifi_sync/wifi_credential.h b/components/wifi_sync/wifi_credential.h
new file mode 100644
index 0000000000000000000000000000000000000000..7c0342a6c7e142049e9d78854b1cf98d69cd26a9
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+++ b/components/wifi_sync/wifi_credential.h
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+// Copyright 2014 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_WIFI_SYNC_WIFI_CREDENTIAL_H_
+#define COMPONENTS_WIFI_SYNC_WIFI_CREDENTIAL_H_
+
+#include <stdint.h>
+
+#include <set>
+#include <string>
+#include <vector>
+
+#include "components/wifi_sync/wifi_security_class.h"
+
+namespace wifi_sync {
+
+// A container to hold the information required to locate and connect
+// to a WiFi network.
+class WifiCredential final {  // final because the class is copyable
+ public:
+  using SsidBytes = std::vector<uint8_t>;
+  using CredentialSet = std::set<
+      WifiCredential,
+      bool(*)(const WifiCredential&a, const WifiCredential& b)>;
+
+  // Constructs a credential with the given |ssid|, |security_class|,
+  // and |passphrase|. No assumptions are made about the input
+  // encoding of |ssid|. The passphrase must be valid UTF-8.
+  WifiCredential(const SsidBytes& ssid,
+                 WifiSecurityClass security_class,
+                 const std::string& passphrase);
+  ~WifiCredential();
+
+  const SsidBytes& ssid() const { return ssid_; }
+  WifiSecurityClass security_class() const { return security_class_; }
+  const std::string& passphrase() const { return passphrase_; }
+
+  // Returns a string representation of the credential, for debugging
+  // purposes. The string will not include the credential's passphrase.
+  std::string ToString() const;
+
+  // Returns true if credential |a| comes before credential |b|.
+  static bool IsLessThan(const WifiCredential& a, const WifiCredential& b);
+
+  // Returns an empty set of WifiCredentials, with the IsLessThan
+  // ordering function plumbed in.
+  static CredentialSet MakeSet();
+
+ private:
+  // The WiFi network's SSID.
+  const SsidBytes ssid_;
+  // The WiFi network's security class (e.g. WEP, PSK).
+  const WifiSecurityClass security_class_;
+  // The passphrase for connecting to the network.
+  const std::string passphrase_;
+};
+
+}  // namespace wifi_sync
+
+#endif  // COMPONENTS_WIFI_SYNC_WIFI_CREDENTIAL_H_