Move blimp AssignmentSource to core

blimp/client/session/assignment_source.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 BLIMP_CLIENT_SESSION_ASSIGNMENT_SOURCE_H_
-#define BLIMP_CLIENT_SESSION_ASSIGNMENT_SOURCE_H_
-
-#include <string>
-
-#include "base/callback.h"
-#include "base/memory/weak_ptr.h"
-#include "net/base/ip_endpoint.h"
-#include "net/url_request/url_fetcher_delegate.h"
-#include "url/gurl.h"
-
-namespace base {
-class FilePath;
-class SingleThreadTaskRunner;
-class Value;
-}
-
-namespace net {
-class URLFetcher;
-class URLRequestContextGetter;
-class X509Certificate;
-}
-
-namespace blimp {
-namespace client {
-
-// An Assignment contains the configuration data needed for a client
-// to connect to the engine.
-struct Assignment {
-  enum TransportProtocol {
-    UNKNOWN = 0,
-    SSL = 1,
-    TCP = 2,
-  };
-
-  Assignment();
-  Assignment(const Assignment& other);
-  ~Assignment();
-
-  // Returns true if the net::IPEndPoint has an unspecified IP, port, or
-  // transport protocol.
-  bool IsValid() const;
-
-  // Specifies the transport to use to connect to the engine.
-  TransportProtocol transport_protocol;
-
-  // Specifies the IP address and port on which to reach the engine.
-  net::IPEndPoint engine_endpoint;
-
-  // Used to authenticate to the specified engine.
-  std::string client_token;
-
-  // Specifies the X.509 certificate that the engine must report.
-  scoped_refptr<net::X509Certificate> cert;
-};
-
-// AssignmentSource provides functionality to find out how a client should
-// connect to an engine.
-class AssignmentSource : public net::URLFetcherDelegate {
- public:
-  // A Java counterpart will be generated for this enum.
-  // GENERATED_JAVA_ENUM_PACKAGE: org.chromium.blimp.assignment
-  enum Result {
-    RESULT_UNKNOWN = 0,
-    RESULT_OK = 1,
-    RESULT_BAD_REQUEST = 2,
-    RESULT_BAD_RESPONSE = 3,
-    RESULT_INVALID_PROTOCOL_VERSION = 4,
-    RESULT_EXPIRED_ACCESS_TOKEN = 5,
-    RESULT_USER_INVALID = 6,
-    RESULT_OUT_OF_VMS = 7,
-    RESULT_SERVER_ERROR = 8,
-    RESULT_SERVER_INTERRUPTED = 9,
-    RESULT_NETWORK_FAILURE = 10,
-    RESULT_INVALID_CERT = 11,
-  };
-
-  typedef base::Callback<void(AssignmentSource::Result, const Assignment&)>
-      AssignmentCallback;
-
-  // |assigner_endpoint|: The URL of the Assigner service to query.
-  // |network_task_runner|: The task runner to use for querying the Assigner API
-  // over the network.
-  // |file_task_runner|: The task runner to use for reading cert files from disk
-  // (specified on the command line.)
-  AssignmentSource(
-      const GURL& assigner_endpoint,
-      const scoped_refptr<base::SingleThreadTaskRunner>& network_task_runner,
-      const scoped_refptr<base::SingleThreadTaskRunner>& file_task_runner);
-
-  ~AssignmentSource() override;
-
-  // Retrieves a valid assignment for the client and posts the result to the
-  // given callback.  |client_auth_token| is the OAuth2 access token to send to
-  // the assigner when requesting an assignment.  If this is called before a
-  // previous call has completed, the old callback will be called with
-  // RESULT_SERVER_INTERRUPTED and no Assignment.
-  void GetAssignment(const std::string& client_auth_token,
-                     const AssignmentCallback& callback);
-
- private:
-  void OnGetAssignmentFromCommandLineDone(const std::string& client_auth_token,
-                                          Assignment parsed_assignment);
-  void QueryAssigner(const std::string& client_auth_token);
-  void ParseAssignerResponse();
-  void OnJsonParsed(std::unique_ptr<base::Value> json);
-  void OnJsonParseError(const std::string& error);
-
-  // net::URLFetcherDelegate implementation:
-  void OnURLFetchComplete(const net::URLFetcher* source) override;
-
-  // GetAssignment() callback, invoked after URLFetcher completion.
-  AssignmentCallback callback_;
-
-  const GURL assigner_endpoint_;
-  scoped_refptr<base::SingleThreadTaskRunner> file_task_runner_;
-  scoped_refptr<net::URLRequestContextGetter> url_request_context_;
-  std::unique_ptr<net::URLFetcher> url_fetcher_;
-
-  base::WeakPtrFactory<AssignmentSource> weak_factory_;
-
-  DISALLOW_COPY_AND_ASSIGN(AssignmentSource);
-};
-
-}  // namespace client
-}  // namespace blimp
-
-#endif  // BLIMP_CLIENT_SESSION_ASSIGNMENT_SOURCE_H_