Revert of Certificate Transparency DNS log client

components/certificate_transparency/log_dns_client.h

-// Copyright 2016 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_CERTIFICATE_TRANSPARENCY_LOG_DNS_CLIENT_H_
-#define COMPONENTS_CERTIFICATE_TRANSPARENCY_LOG_DNS_CLIENT_H_
-
-#include <stdint.h>
-
-#include <list>
-#include <string>
-
-#include "base/callback.h"
-#include "base/macros.h"
-#include "base/strings/string_piece.h"
-#include "net/log/net_log.h"
-
-namespace net {
-class DnsClient;
-class DnsResponse;
-class DnsTransaction;
-namespace ct {
-struct MerkleAuditProof;
-}  // namespace ct
-}  // namespace net
-
-namespace certificate_transparency {
-
-// Queries Certificate Transparency (CT) log servers via DNS.
-// All queries are performed asynchronously.
-// For more information, see
-// https://github.com/google/certificate-transparency-rfcs/blob/master/dns/draft-ct-over-dns.md.
-class LogDnsClient {
- public:
-  // Invoked when a leaf index query completes.
-  // If an error occured, |net_error| will be a net::Error code, otherwise it
-  // will be net::OK and |leaf_index| will be the leaf index that was received.
-  using LeafIndexCallback =
-      base::Callback<void(int net_error, uint64_t leaf_index)>;
-  // Invoked when an audit proof query completes.
-  // If an error occurred, |net_error| will be a net::Error code, otherwise it
-  // will be net::OK and |proof| will be the audit proof that was received.
-  // The log ID of |proof| will not be set, as that is not known by this class,
-  // but the leaf index will be set.
-  using AuditProofCallback =
-      base::Callback<void(int net_error,
-                          std::unique_ptr<net::ct::MerkleAuditProof> proof)>;
-
-  // Creates a log client that will take ownership of |dns_client| and use it
-  // to perform DNS queries. Queries will be logged to |net_log|.
-  LogDnsClient(std::unique_ptr<net::DnsClient> dns_client,
-               const net::BoundNetLog& net_log);
-  virtual ~LogDnsClient();
-
-  // Queries a CT log to discover the index of the leaf with |leaf_hash|.
-  // The log is identified by |domain_for_log|, which is the DNS name used as a
-  // suffix for all queries.
-  // The |leaf_hash| is the SHA-256 hash of a Merkle tree leaf in that log.
-  // The |callback| is invoked when the query is complete, or an error occurs.
-  void QueryLeafIndex(base::StringPiece domain_for_log,
-                      base::StringPiece leaf_hash,
-                      const LeafIndexCallback& callback);
-
-  // Queries a CT log to retrieve an audit proof for the leaf at |leaf_index|.
-  // The size of the CT log tree must be provided in |tree_size|.
-  // The log is identified by |domain_for_log|, which is the DNS name used as a
-  // suffix for all queries.
-  // The |callback| is invoked when the query is complete, or an error occurs.
-  void QueryAuditProof(base::StringPiece domain_for_log,
-                       uint64_t leaf_index,
-                       uint64_t tree_size,
-                       const AuditProofCallback& callback);
-
- private:
-  void QueryLeafIndexComplete(net::DnsTransaction* transaction,
-                              int neterror,
-                              const net::DnsResponse* response);
-
-  // Queries a CT log to retrieve part of an audit |proof|. The |node_index|
-  // indicates which node of the audit proof/ should be requested. The CT log
-  // may return up to 7 nodes, starting from |node_index| (this is the maximum
-  // that will fit in a DNS UDP packet). The nodes will be appended to
-  // |proof->nodes|.
-  void QueryAuditProofNodes(std::unique_ptr<net::ct::MerkleAuditProof> proof,
-                            base::StringPiece domain_for_log,
-                            uint64_t tree_size,
-                            uint64_t node_index,
-                            const AuditProofCallback& callback);
-
-  void QueryAuditProofNodesComplete(
-      std::unique_ptr<net::ct::MerkleAuditProof> proof,
-      base::StringPiece domain_for_log,
-      uint64_t tree_size,
-      net::DnsTransaction* transaction,
-      int net_error,
-      const net::DnsResponse* response);
-
-  // A DNS query that is in flight.
-  template <typename CallbackType>
-  struct Query {
-    std::unique_ptr<net::DnsTransaction> transaction;
-    CallbackType callback;
-  };
-
-  // Used to perform DNS queries.
-  std::unique_ptr<net::DnsClient> dns_client_;
-  // Passed to the DNS client for logging.
-  net::BoundNetLog net_log_;
-  // Leaf index queries that haven't completed yet.
-  std::list<Query<LeafIndexCallback>> leaf_index_queries_;
-  // Audit proof queries that haven't completed yet.
-  std::list<Query<AuditProofCallback>> audit_proof_queries_;
-  // Creates weak_ptrs to this, for callback purposes.
-  base::WeakPtrFactory<LogDnsClient> weak_ptr_factory_;
-
-  DISALLOW_COPY_AND_ASSIGN(LogDnsClient);
-};
-
-}  // namespace certificate_transparency
-#endif  // COMPONENTS_CERTIFICATE_TRANSPARENCY_LOG_DNS_CLIENT_H_