Move blimp AssignmentSource to core

blimp/client/session/assignment_source.cc

Index: blimp/client/session/assignment_source.cc
diff --git a/blimp/client/session/assignment_source.cc b/blimp/client/session/assignment_source.cc
deleted file mode 100644
index 2ecb85651c4a350b298b7a852cb28384b8d4a446..0000000000000000000000000000000000000000
--- a/blimp/client/session/assignment_source.cc
+++ /dev/null
@@ -1,381 +0,0 @@
-// 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.
-
-#include "blimp/client/session/assignment_source.h"
-
-#include "base/bind.h"
-#include "base/callback_helpers.h"
-#include "base/command_line.h"
-#include "base/files/file_util.h"
-#include "base/json/json_reader.h"
-#include "base/json/json_writer.h"
-#include "base/location.h"
-#include "base/memory/ref_counted.h"
-#include "base/numerics/safe_conversions.h"
-#include "base/strings/string_number_conversions.h"
-#include "base/task_runner_util.h"
-#include "base/threading/thread_restrictions.h"
-#include "base/values.h"
-#include "blimp/client/core/blimp_client_switches.h"
-#include "blimp/common/get_client_token.h"
-#include "blimp/common/protocol_version.h"
-#include "components/safe_json/safe_json_parser.h"
-#include "net/base/ip_address.h"
-#include "net/base/ip_endpoint.h"
-#include "net/base/load_flags.h"
-#include "net/base/net_errors.h"
-#include "net/http/http_status_code.h"
-#include "net/proxy/proxy_config_service.h"
-#include "net/proxy/proxy_service.h"
-#include "net/url_request/url_fetcher.h"
-#include "net/url_request/url_request_context.h"
-#include "net/url_request/url_request_context_builder.h"
-#include "net/url_request/url_request_context_getter.h"
-
-namespace blimp {
-namespace client {
-
-namespace {
-
-// Assignment request JSON keys.
-const char kProtocolVersionKey[] = "protocol_version";
-
-// Assignment response JSON keys.
-const char kClientTokenKey[] = "clientToken";
-const char kHostKey[] = "host";
-const char kPortKey[] = "port";
-const char kCertificateKey[] = "certificate";
-
-// Possible arguments for the "--engine-transport" command line parameter.
-const char kSSLTransportValue[] = "ssl";
-const char kTCPTransportValue[] = "tcp";
-
-class SimpleURLRequestContextGetter : public net::URLRequestContextGetter {
- public:
-  SimpleURLRequestContextGetter(
-      scoped_refptr<base::SingleThreadTaskRunner> io_loop_task_runner)
-      : io_loop_task_runner_(std::move(io_loop_task_runner)),
-        proxy_config_service_(net::ProxyService::CreateSystemProxyConfigService(
-            io_loop_task_runner_,
-            io_loop_task_runner_)) {}
-
-  // net::URLRequestContextGetter implementation.
-  net::URLRequestContext* GetURLRequestContext() override {
-    if (!url_request_context_) {
-      net::URLRequestContextBuilder builder;
-      builder.set_proxy_config_service(std::move(proxy_config_service_));
-      builder.DisableHttpCache();
-      url_request_context_ = builder.Build();
-    }
-
-    return url_request_context_.get();
-  }
-
-  scoped_refptr<base::SingleThreadTaskRunner> GetNetworkTaskRunner()
-      const override {
-    return io_loop_task_runner_;
-  }
-
- private:
-  ~SimpleURLRequestContextGetter() override {}
-
-  scoped_refptr<base::SingleThreadTaskRunner> io_loop_task_runner_;
-  std::unique_ptr<net::URLRequestContext> url_request_context_;
-
-  // Temporary storage for the ProxyConfigService, which needs to be created on
-  // the main thread but cleared on the IO thread.  This will be built in the
-  // constructor and cleared on the IO thread.  Due to the usage of this class
-  // this is safe.
-  std::unique_ptr<net::ProxyConfigService> proxy_config_service_;
-
-  DISALLOW_COPY_AND_ASSIGN(SimpleURLRequestContextGetter);
-};
-
-bool IsValidIpPortNumber(unsigned port) {
-  return port > 0 && port <= 65535;
-}
-
-// Populates an Assignment using command-line parameters, if provided.
-// Returns a null Assignment if no parameters were set.
-// Must be called on a thread suitable for file IO.
-Assignment GetAssignmentFromCommandLine() {
-  Assignment assignment;
-
-  const base::CommandLine* cmd_line = base::CommandLine::ForCurrentProcess();
-  assignment.client_token = GetClientToken(*cmd_line);
-  CHECK(!assignment.client_token.empty()) << "No client token provided.";
-
-  unsigned port_parsed = 0;
-  if (!base::StringToUint(
-          cmd_line->GetSwitchValueASCII(switches::kEnginePort),
-          &port_parsed) || !IsValidIpPortNumber(port_parsed)) {
-    DLOG(FATAL) << "--engine-port must be a value between 1 and 65535.";
-    return Assignment();
-  }
-
-  net::IPAddress ip_address;
-  std::string ip_str = cmd_line->GetSwitchValueASCII(switches::kEngineIP);
-  if (!ip_address.AssignFromIPLiteral(ip_str)) {
-    DLOG(FATAL) << "Invalid engine IP " << ip_str;
-    return Assignment();
-  }
-  assignment.engine_endpoint =
-      net::IPEndPoint(ip_address, base::checked_cast<uint16_t>(port_parsed));
-
-  std::string transport_str =
-      cmd_line->GetSwitchValueASCII(switches::kEngineTransport);
-  if (transport_str == kSSLTransportValue) {
-    assignment.transport_protocol = Assignment::TransportProtocol::SSL;
-  } else if (transport_str == kTCPTransportValue) {
-    assignment.transport_protocol = Assignment::TransportProtocol::TCP;
-  } else {
-    DLOG(FATAL) << "Invalid engine transport " << transport_str;
-    return Assignment();
-  }
-
-  scoped_refptr<net::X509Certificate> cert;
-  if (assignment.transport_protocol == Assignment::TransportProtocol::SSL) {
-    base::FilePath cert_path =
-        cmd_line->GetSwitchValuePath(switches::kEngineCertPath);
-    if (cert_path.empty()) {
-      DLOG(FATAL) << "Missing required parameter --"
-                  << switches::kEngineCertPath << ".";
-      return Assignment();
-    }
-    std::string cert_str;
-    if (!base::ReadFileToString(cert_path, &cert_str)) {
-      DLOG(FATAL) << "Couldn't read from file: "
-                  << cert_path.LossyDisplayName();
-      return Assignment();
-    }
-    net::CertificateList cert_list =
-        net::X509Certificate::CreateCertificateListFromBytes(
-            cert_str.data(), cert_str.size(),
-            net::X509Certificate::FORMAT_PEM_CERT_SEQUENCE);
-    DLOG_IF(FATAL, (cert_list.size() != 1u))
-        << "Only one cert is allowed in PEM cert list.";
-    assignment.cert = std::move(cert_list[0]);
-  }
-
-  if (!assignment.IsValid()) {
-    DLOG(FATAL) << "Invalid command-line assignment.";
-    return Assignment();
-  }
-
-  return assignment;
-}
-
-}  // namespace
-
-Assignment::Assignment() : transport_protocol(TransportProtocol::UNKNOWN) {}
-
-Assignment::Assignment(const Assignment& other) = default;
-
-Assignment::~Assignment() {}
-
-bool Assignment::IsValid() const {
-  if (engine_endpoint.address().empty() || engine_endpoint.port() == 0 ||
-      transport_protocol == TransportProtocol::UNKNOWN) {
-    return false;
-  }
-  if (transport_protocol == TransportProtocol::SSL && !cert) {
-    return false;
-  }
-  return true;
-}
-
-AssignmentSource::AssignmentSource(
-    const GURL& assigner_endpoint,
-    const scoped_refptr<base::SingleThreadTaskRunner>& network_task_runner,
-    const scoped_refptr<base::SingleThreadTaskRunner>& file_task_runner)
-    : assigner_endpoint_(assigner_endpoint),
-      file_task_runner_(std::move(file_task_runner)),
-      url_request_context_(
-          new SimpleURLRequestContextGetter(network_task_runner)),
-      weak_factory_(this) {
-  DCHECK(assigner_endpoint_.is_valid());
-}
-
-AssignmentSource::~AssignmentSource() {}
-
-void AssignmentSource::GetAssignment(const std::string& client_auth_token,
-                                     const AssignmentCallback& callback) {
-  DCHECK(callback_.is_null());
-  callback_ = AssignmentCallback(callback);
-
-  if (base::CommandLine::ForCurrentProcess()->HasSwitch(switches::kEngineIP)) {
-    base::PostTaskAndReplyWithResult(
-        file_task_runner_.get(), FROM_HERE,
-        base::Bind(&GetAssignmentFromCommandLine),
-        base::Bind(&AssignmentSource::OnGetAssignmentFromCommandLineDone,
-                   weak_factory_.GetWeakPtr(), client_auth_token));
-  } else {
-    QueryAssigner(client_auth_token);
-  }
-}
-
-void AssignmentSource::OnGetAssignmentFromCommandLineDone(
-    const std::string& client_auth_token,
-    Assignment parsed_assignment) {
-  // If GetAssignmentFromCommandLine succeeded, then return its output.
-  if (parsed_assignment.IsValid()) {
-    base::ResetAndReturn(&callback_)
-        .Run(AssignmentSource::RESULT_OK, parsed_assignment);
-    return;
-  }
-
-  // If no assignment was passed via the command line, then fall back on
-  // querying the Assigner service.
-  QueryAssigner(client_auth_token);
-}
-
-void AssignmentSource::QueryAssigner(const std::string& client_auth_token) {
-  // Call out to the network for a real assignment.  Build the network request
-  // to hit the assigner.
-  url_fetcher_ =
-      net::URLFetcher::Create(assigner_endpoint_, net::URLFetcher::POST, this);
-  url_fetcher_->SetRequestContext(url_request_context_.get());
-  url_fetcher_->SetLoadFlags(net::LOAD_DO_NOT_SAVE_COOKIES |
-                             net::LOAD_DO_NOT_SEND_COOKIES);
-  url_fetcher_->AddExtraRequestHeader("Authorization: Bearer " +
-                                      client_auth_token);
-
-  // Write the JSON for the request data.
-  base::DictionaryValue dictionary;
-  dictionary.SetString(kProtocolVersionKey,
-                       base::IntToString(kProtocolVersion));
-  std::string json;
-  base::JSONWriter::Write(dictionary, &json);
-  url_fetcher_->SetUploadData("application/json", json);
-  url_fetcher_->Start();
-}
-
-void AssignmentSource::OnURLFetchComplete(const net::URLFetcher* source) {
-  DCHECK(!callback_.is_null());
-  DCHECK_EQ(url_fetcher_.get(), source);
-
-  if (!source->GetStatus().is_success()) {
-    DVLOG(1) << "Assignment request failed due to network error: "
-             << net::ErrorToString(source->GetStatus().error());
-    base::ResetAndReturn(&callback_)
-        .Run(AssignmentSource::Result::RESULT_NETWORK_FAILURE, Assignment());
-    return;
-  }
-
-  switch (source->GetResponseCode()) {
-    case net::HTTP_OK:
-      ParseAssignerResponse();
-      break;
-    case net::HTTP_BAD_REQUEST:
-      base::ResetAndReturn(&callback_)
-          .Run(AssignmentSource::Result::RESULT_BAD_REQUEST, Assignment());
-      break;
-    case net::HTTP_UNAUTHORIZED:
-      base::ResetAndReturn(&callback_)
-          .Run(AssignmentSource::Result::RESULT_EXPIRED_ACCESS_TOKEN,
-               Assignment());
-      break;
-    case net::HTTP_FORBIDDEN:
-      base::ResetAndReturn(&callback_)
-          .Run(AssignmentSource::Result::RESULT_USER_INVALID, Assignment());
-      break;
-    case 429:  // Too Many Requests
-      base::ResetAndReturn(&callback_)
-          .Run(AssignmentSource::Result::RESULT_OUT_OF_VMS, Assignment());
-      break;
-    case net::HTTP_INTERNAL_SERVER_ERROR:
-      base::ResetAndReturn(&callback_)
-          .Run(AssignmentSource::Result::RESULT_SERVER_ERROR, Assignment());
-      break;
-    default:
-      base::ResetAndReturn(&callback_)
-          .Run(AssignmentSource::Result::RESULT_BAD_RESPONSE, Assignment());
-      break;
-  }
-}
-
-void AssignmentSource::ParseAssignerResponse() {
-  DCHECK(url_fetcher_.get());
-  DCHECK(url_fetcher_->GetStatus().is_success());
-  DCHECK_EQ(net::HTTP_OK, url_fetcher_->GetResponseCode());
-
-  // Grab the response from the assigner request.
-  std::string response;
-  if (!url_fetcher_->GetResponseAsString(&response)) {
-    base::ResetAndReturn(&callback_)
-        .Run(AssignmentSource::Result::RESULT_BAD_RESPONSE, Assignment());
-    return;
-  }
-
-  safe_json::SafeJsonParser::Parse(
-      response,
-      base::Bind(&AssignmentSource::OnJsonParsed, weak_factory_.GetWeakPtr()),
-      base::Bind(&AssignmentSource::OnJsonParseError,
-                 weak_factory_.GetWeakPtr()));
-}
-
-void AssignmentSource::OnJsonParsed(std::unique_ptr<base::Value> json) {
-  const base::DictionaryValue* dict;
-  if (!json->GetAsDictionary(&dict)) {
-    base::ResetAndReturn(&callback_)
-        .Run(AssignmentSource::Result::RESULT_BAD_RESPONSE, Assignment());
-    return;
-  }
-
-  // Validate that all the expected fields are present.
-  std::string client_token;
-  std::string host;
-  int port;
-  std::string cert_str;
-  if (!(dict->GetString(kClientTokenKey, &client_token) &&
-        dict->GetString(kHostKey, &host) && dict->GetInteger(kPortKey, &port) &&
-        dict->GetString(kCertificateKey, &cert_str))) {
-    base::ResetAndReturn(&callback_)
-        .Run(AssignmentSource::Result::RESULT_BAD_RESPONSE, Assignment());
-    return;
-  }
-
-  net::IPAddress ip_address;
-  if (!ip_address.AssignFromIPLiteral(host)) {
-    base::ResetAndReturn(&callback_)
-        .Run(AssignmentSource::Result::RESULT_BAD_RESPONSE, Assignment());
-    return;
-  }
-
-  if (!base::IsValueInRangeForNumericType<uint16_t>(port)) {
-    base::ResetAndReturn(&callback_)
-        .Run(AssignmentSource::Result::RESULT_BAD_RESPONSE, Assignment());
-    return;
-  }
-
-  net::CertificateList cert_list =
-      net::X509Certificate::CreateCertificateListFromBytes(
-          cert_str.data(), cert_str.size(),
-          net::X509Certificate::FORMAT_PEM_CERT_SEQUENCE);
-  if (cert_list.size() != 1) {
-    base::ResetAndReturn(&callback_)
-        .Run(AssignmentSource::Result::RESULT_INVALID_CERT, Assignment());
-    return;
-  }
-
-  // The assigner assumes SSL-only and all engines it assigns only communicate
-  // over SSL.
-  Assignment assignment;
-  assignment.transport_protocol = Assignment::TransportProtocol::SSL;
-  assignment.engine_endpoint = net::IPEndPoint(ip_address, port);
-  assignment.client_token = client_token;
-  assignment.cert = std::move(cert_list[0]);
-
-  base::ResetAndReturn(&callback_)
-      .Run(AssignmentSource::Result::RESULT_OK, assignment);
-}
-
-void AssignmentSource::OnJsonParseError(const std::string& error) {
-  DLOG(ERROR) << "Error while parsing assigner JSON: " << error;
-  base::ResetAndReturn(&callback_)
-      .Run(AssignmentSource::Result::RESULT_BAD_RESPONSE, Assignment());
-}
-
-}  // namespace client
-}  // namespace blimp