src/cloud_print/gcp20/prototype/printer.cc

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "cloud_print/gcp20/prototype/printer.h"
   6
   7 #include <algorithm>
   8 #include <limits.h>
   9 #include <stdio.h>
  10 #include <string>
  11 #include <vector>
  12
  13 #include "base/bind.h"
  14 #include "base/command_line.h"
  15 #include "base/file_util.h"
  16 #include "base/format_macros.h"
  17 #include "base/guid.h"
  18 #include "base/json/json_reader.h"
  19 #include "base/json/json_writer.h"
  20 #include "base/rand_util.h"
  21 #include "base/strings/string_number_conversions.h"
  22 #include "base/strings/string_util.h"
  23 #include "base/strings/stringprintf.h"
  24 #include "cloud_print/gcp20/prototype/command_line_reader.h"
  25 #include "cloud_print/gcp20/prototype/local_settings.h"
  26 #include "cloud_print/gcp20/prototype/service_parameters.h"
  27 #include "cloud_print/gcp20/prototype/special_io.h"
  28 #include "cloud_print/version.h"
  29 #include "net/base/net_util.h"
  30 #include "net/base/url_util.h"
  31
  32 const char kPrinterStatePathDefault[] = "printer_state.json";
  33
  34 namespace {
  35
  36 const uint16 kHttpPortDefault = 10101;
  37 const uint32 kTtlDefault = 60*60;  // in seconds
  38
  39 const char kServiceType[] = "_privet._tcp.local";
  40 const char kSecondaryServiceType[] = "_printer._sub._privet._tcp.local";
  41 const char kServiceNamePrefixDefault[] = "gcp20_device_";
  42 const char kServiceDomainNameFormatDefault[] = "my-privet-device%d.local";
  43
  44 const char kPrinterName[] = "Google GCP2.0 Prototype";
  45 const char kPrinterDescription[] = "Printer emulator";
  46
  47 const char kUserConfirmationTitle[] = "Confirm registration: type 'y' if you "
  48                                       "agree and any other to discard\n";
  49 const int kUserConfirmationTimeout = 30;  // in seconds
  50 const int kRegistrationTimeout = 60;  // in seconds
  51 const int kReconnectTimeout = 5;  // in seconds
  52
  53 const double kTimeToNextAccessTokenUpdate = 0.8;  // relatively to living time.
  54
  55 const char kCdd[] =
  56 "{"
  57 "  'version': '1.0',"
  58 "  'printer': {"
  59 "    'supported_content_type': ["
  60 "      {"
  61 "        'content_type': 'application/pdf'"
  62 "      },"
  63 "      {"
  64 "        'content_type': 'image/pwg-raster'"
  65 "      },"
  66 "      {"
  67 "        'content_type': 'image/jpeg'"
  68 "      }"
  69 "    ],"
  70 "    'color': {"
  71 "     'option': ["
  72 "        {"
  73 "          'is_default': true,"
  74 "          'type': 'STANDARD_COLOR'"
  75 "        },"
  76 "        {"
  77 "          'type': 'STANDARD_MONOCHROME'"
  78 "        }"
  79 "      ]"
  80 "    },"
  81 "    'media_size': {"
  82 "       'option': [ {"
  83 "          'height_microns': 297000,"
  84 "          'name': 'ISO_A4',"
  85 "          'width_microns': 210000"
  86 "       }, {"
  87 "          'custom_display_name': 'Letter',"
  88 "          'height_microns': 279400,"
  89 "          'is_default': true,"
  90 "          'name': 'NA_LETTER',"
  91 "          'width_microns': 215900"
  92 "       } ]"
  93 "    },"
  94 "    'page_orientation': {"
  95 "       'option': [ {"
  96 "          'is_default': true,"
  97 "          'type': 'PORTRAIT'"
  98 "       }, {"
  99 "          'type': 'LANDSCAPE'"
 100 "       } ]"
 101 "    },"
 102 "    'reverse_order': {"
 103 "      'default': false"
 104 "    }"
 105 "  }"
 106 "}";
 107
 108 // Returns local IP address number of first interface found (except loopback).
 109 // Return value is empty if no interface found. Possible interfaces names are
 110 // "eth0", "wlan0" etc. If interface name is empty, function will return IP
 111 // address of first interface found.
 112 net::IPAddressNumber GetLocalIp(const std::string& interface_name,
 113                                 bool return_ipv6_number) {
 114   net::NetworkInterfaceList interfaces;
 115   bool success = net::GetNetworkList(
 116       &interfaces, net::INCLUDE_HOST_SCOPE_VIRTUAL_INTERFACES);
 117   DCHECK(success);
 118
 119   size_t expected_address_size = return_ipv6_number ? net::kIPv6AddressSize
 120                                                     : net::kIPv4AddressSize;
 121
 122   for (net::NetworkInterfaceList::iterator iter = interfaces.begin();
 123        iter != interfaces.end(); ++iter) {
 124     if (iter->address.size() == expected_address_size &&
 125         (interface_name.empty() || interface_name == iter->name)) {
 126       return iter->address;
 127     }
 128   }
 129
 130   return net::IPAddressNumber();
 131 }
 132
 133 std::string GetDescription() {
 134   std::string result = kPrinterDescription;
 135   net::IPAddressNumber ip = GetLocalIp("", false);
 136   if (!ip.empty())
 137     result += " at " + net::IPAddressToString(ip);
 138   return result;
 139 }
 140
 141 scoped_refptr<base::SingleThreadTaskRunner> GetTaskRunner() {
 142   return base::MessageLoop::current()->message_loop_proxy();
 143 }
 144
 145 }  // namespace
 146
 147 using cloud_print_response_parser::Job;
 148
 149 Printer::Printer()
 150     : connection_state_(OFFLINE),
 151       http_server_(this),
 152       on_idle_posted_(false),
 153       pending_local_settings_check_(false),
 154       pending_print_jobs_check_(false),
 155       pending_deletion_(false) {
 156 }
 157
 158 Printer::~Printer() {
 159   Stop();
 160 }
 161
 162 bool Printer::Start() {
 163   if (IsRunning())
 164     return true;
 165
 166   LoadFromFile();
 167
 168   if (state_.local_settings.local_discovery && !StartLocalDiscoveryServers())
 169     return false;
 170
 171   print_job_handler_.reset(new PrintJobHandler);
 172   xtoken_ = XPrivetToken();
 173   starttime_ = base::Time::Now();
 174
 175   TryConnect();
 176   return true;
 177 }
 178
 179 bool Printer::IsRunning() const {
 180   return print_job_handler_;
 181 }
 182
 183 void Printer::Stop() {
 184   if (!IsRunning())
 185     return;
 186   dns_server_.Shutdown();
 187   http_server_.Shutdown();
 188   requester_.reset();
 189   print_job_handler_.reset();
 190   xmpp_listener_.reset();
 191 }
 192
 193 std::string Printer::GetRawCdd() {
 194   std::string json_str;
 195   base::JSONWriter::WriteWithOptions(&GetCapabilities(),
 196                                      base::JSONWriter::OPTIONS_PRETTY_PRINT,
 197                                      &json_str);
 198   return json_str;
 199 }
 200
 201 void Printer::OnAuthError() {
 202   LOG(ERROR) << "Auth error occurred";
 203   state_.access_token_update = base::Time();
 204   FallOffline(true);
 205 }
 206
 207 std::string Printer::GetAccessToken() {
 208   return state_.access_token;
 209 }
 210
 211 PrivetHttpServer::RegistrationErrorStatus Printer::RegistrationStart(
 212     const std::string& user) {
 213   CheckRegistrationExpiration();
 214
 215   PrinterState::ConfirmationState conf_state = state_.confirmation_state;
 216   if (state_.registration_state == PrinterState::REGISTRATION_ERROR ||
 217       conf_state == PrinterState::CONFIRMATION_TIMEOUT ||
 218       conf_state == PrinterState::CONFIRMATION_DISCARDED) {
 219     state_ = PrinterState();
 220   }
 221
 222   PrivetHttpServer::RegistrationErrorStatus status = CheckCommonRegErrors(user);
 223   if (status != PrivetHttpServer::REG_ERROR_OK)
 224     return status;
 225
 226   if (state_.registration_state != PrinterState::UNREGISTERED)
 227     return PrivetHttpServer::REG_ERROR_INVALID_ACTION;
 228
 229   UpdateRegistrationExpiration();
 230
 231   state_ = PrinterState();
 232   state_.user = user;
 233   state_.registration_state = PrinterState::REGISTRATION_STARTED;
 234
 235   if (CommandLine::ForCurrentProcess()->HasSwitch("disable-confirmation")) {
 236     state_.confirmation_state = PrinterState::CONFIRMATION_CONFIRMED;
 237     VLOG(0) << "Registration confirmed by default.";
 238   } else {
 239     LOG(WARNING) << kUserConfirmationTitle;
 240     base::Time valid_until = base::Time::Now() +
 241         base::TimeDelta::FromSeconds(kUserConfirmationTimeout);
 242     base::MessageLoop::current()->PostTask(
 243         FROM_HERE,
 244         base::Bind(&Printer::WaitUserConfirmation, AsWeakPtr(), valid_until));
 245   }
 246
 247   requester_->StartRegistration(GenerateProxyId(), kPrinterName, user,
 248                                 state_.local_settings, GetRawCdd());
 249
 250   return PrivetHttpServer::REG_ERROR_OK;
 251 }
 252
 253 PrivetHttpServer::RegistrationErrorStatus Printer::RegistrationGetClaimToken(
 254     const std::string& user,
 255     std::string* token,
 256     std::string* claim_url) {
 257   PrivetHttpServer::RegistrationErrorStatus status = CheckCommonRegErrors(user);
 258   if (status != PrivetHttpServer::REG_ERROR_OK)
 259     return status;
 260
 261   // Check if |action=start| was called, but |action=complete| wasn't.
 262   if (state_.registration_state != PrinterState::REGISTRATION_STARTED &&
 263       state_.registration_state !=
 264           PrinterState::REGISTRATION_CLAIM_TOKEN_READY) {
 265     return PrivetHttpServer::REG_ERROR_INVALID_ACTION;
 266   }
 267
 268   // If |action=getClaimToken| is valid in this state (was checked above) then
 269   // check confirmation status.
 270   if (state_.confirmation_state != PrinterState::CONFIRMATION_CONFIRMED)
 271     return ConfirmationToRegistrationError(state_.confirmation_state);
 272
 273   UpdateRegistrationExpiration();
 274
 275   // If reply wasn't received yet, reply with |pending_user_action| error.
 276   if (state_.registration_state == PrinterState::REGISTRATION_STARTED)
 277     return PrivetHttpServer::REG_ERROR_PENDING_USER_ACTION;
 278
 279   DCHECK_EQ(state_.confirmation_state, PrinterState::CONFIRMATION_CONFIRMED);
 280   DCHECK_EQ(state_.registration_state,
 281             PrinterState::REGISTRATION_CLAIM_TOKEN_READY);
 282
 283   *token = state_.registration_token;
 284   *claim_url = state_.complete_invite_url;
 285   return PrivetHttpServer::REG_ERROR_OK;
 286 }
 287
 288 PrivetHttpServer::RegistrationErrorStatus Printer::RegistrationComplete(
 289     const std::string& user,
 290     std::string* device_id) {
 291   PrivetHttpServer::RegistrationErrorStatus status = CheckCommonRegErrors(user);
 292   if (status != PrivetHttpServer::REG_ERROR_OK)
 293     return status;
 294
 295   if (state_.registration_state != PrinterState::REGISTRATION_CLAIM_TOKEN_READY)
 296     return PrivetHttpServer::REG_ERROR_INVALID_ACTION;
 297
 298   UpdateRegistrationExpiration();
 299
 300   if (state_.confirmation_state != PrinterState::CONFIRMATION_CONFIRMED)
 301     return ConfirmationToRegistrationError(state_.confirmation_state);
 302
 303   state_.registration_state = PrinterState::REGISTRATION_COMPLETING;
 304   requester_->CompleteRegistration();
 305   *device_id = state_.device_id;
 306
 307   return PrivetHttpServer::REG_ERROR_OK;
 308 }
 309
 310 PrivetHttpServer::RegistrationErrorStatus Printer::RegistrationCancel(
 311     const std::string& user) {
 312   PrivetHttpServer::RegistrationErrorStatus status = CheckCommonRegErrors(user);
 313   if (status != PrivetHttpServer::REG_ERROR_OK &&
 314       status != PrivetHttpServer::REG_ERROR_SERVER_ERROR) {
 315     return status;
 316   }
 317
 318   if (state_.registration_state == PrinterState::UNREGISTERED)
 319     return PrivetHttpServer::REG_ERROR_INVALID_ACTION;
 320
 321   InvalidateRegistrationExpiration();
 322
 323   state_ = PrinterState();
 324
 325   requester_.reset(new CloudPrintRequester(GetTaskRunner(), this));
 326
 327   return PrivetHttpServer::REG_ERROR_OK;
 328 }
 329
 330 void Printer::GetRegistrationServerError(std::string* description) {
 331   DCHECK_EQ(state_.registration_state, PrinterState::REGISTRATION_ERROR)
 332       << "Method shouldn't be called when not needed.";
 333
 334   *description = state_.error_description;
 335 }
 336
 337 void Printer::CreateInfo(PrivetHttpServer::DeviceInfo* info) {
 338   CheckRegistrationExpiration();
 339
 340   // TODO(maksymb): Replace "text" with constants.
 341   *info = PrivetHttpServer::DeviceInfo();
 342   info->version = "1.0";
 343   info->name = kPrinterName;
 344   info->description = GetDescription();
 345   info->url = kCloudPrintUrl;
 346   info->id = state_.device_id;
 347   info->device_state = "idle";
 348   info->connection_state = ConnectionStateToString(connection_state_);
 349   info->manufacturer = COMPANY_FULLNAME_STRING;
 350   info->model = "Prototype r" + std::string(LASTCHANGE_STRING);
 351   info->serial_number = "20CB5FF2-B28C-4EFA-8DCD-516CFF0455A2";
 352   info->firmware = CHROME_VERSION_STRING;
 353   info->uptime = static_cast<int>((base::Time::Now() - starttime_).InSeconds());
 354
 355   info->x_privet_token = xtoken_.GenerateXToken();
 356
 357   // TODO(maksymb): Create enum for available APIs and replace
 358   // this API text names with constants from enum. API text names should be only
 359   // known in PrivetHttpServer.
 360   if (!IsRegistered()) {
 361     info->api.push_back("/privet/register");
 362   } else {
 363     info->api.push_back("/privet/capabilities");
 364     if (IsLocalPrintingAllowed()) {
 365       info->api.push_back("/privet/printer/createjob");
 366       info->api.push_back("/privet/printer/submitdoc");
 367       info->api.push_back("/privet/printer/jobstate");
 368     }
 369   }
 370
 371   info->type.push_back("printer");
 372 }
 373
 374 bool Printer::IsRegistered() const {
 375   return state_.registration_state == PrinterState::REGISTERED;
 376 }
 377
 378 bool Printer::IsLocalPrintingAllowed() const {
 379   return state_.local_settings.local_printing_enabled;
 380 }
 381
 382 bool Printer::CheckXPrivetTokenHeader(const std::string& token) const {
 383   return xtoken_.CheckValidXToken(token);
 384 }
 385
 386 const base::DictionaryValue& Printer::GetCapabilities() {
 387   if (!state_.cdd.get()) {
 388     std::string cdd_string;
 389     base::ReplaceChars(kCdd, "'", "\"", &cdd_string);
 390     scoped_ptr<base::Value> json_val(base::JSONReader::Read(cdd_string));
 391     base::DictionaryValue* json = NULL;
 392     CHECK(json_val->GetAsDictionary(&json));
 393     state_.cdd.reset(json->DeepCopy());
 394   }
 395   return *state_.cdd;
 396 }
 397
 398 LocalPrintJob::CreateResult Printer::CreateJob(const std::string& ticket,
 399                                                std::string* job_id,
 400                                                int* expires_in,
 401                                                int* error_timeout,
 402                                                std::string* error_description) {
 403   return print_job_handler_->CreatePrintJob(ticket, job_id, expires_in,
 404                                             error_timeout, error_description);
 405 }
 406
 407 LocalPrintJob::SaveResult Printer::SubmitDoc(const LocalPrintJob& job,
 408                                              std::string* job_id,
 409                                              int* expires_in,
 410                                              std::string* error_description,
 411                                              int* timeout) {
 412   return print_job_handler_->SaveLocalPrintJob(job, job_id, expires_in,
 413                                                error_description, timeout);
 414 }
 415
 416 LocalPrintJob::SaveResult Printer::SubmitDocWithId(
 417     const LocalPrintJob& job,
 418     const std::string& job_id,
 419     int* expires_in,
 420     std::string* error_description,
 421     int* timeout) {
 422   return print_job_handler_->CompleteLocalPrintJob(job, job_id, expires_in,
 423                                                    error_description, timeout);
 424 }
 425
 426 bool Printer::GetJobState(const std::string& id, LocalPrintJob::Info* info) {
 427   return print_job_handler_->GetJobState(id, info);
 428 }
 429
 430 void Printer::OnRegistrationStartResponseParsed(
 431     const std::string& registration_token,
 432     const std::string& complete_invite_url,
 433     const std::string& device_id) {
 434   state_.registration_state = PrinterState::REGISTRATION_CLAIM_TOKEN_READY;
 435   state_.device_id = device_id;
 436   state_.registration_token = registration_token;
 437   state_.complete_invite_url = complete_invite_url;
 438 }
 439
 440 void Printer::OnRegistrationFinished(const std::string& refresh_token,
 441                                      const std::string& access_token,
 442                                      int access_token_expires_in_seconds) {
 443   InvalidateRegistrationExpiration();
 444
 445   state_.registration_state = PrinterState::REGISTERED;
 446   state_.refresh_token = refresh_token;
 447   RememberAccessToken(access_token, access_token_expires_in_seconds);
 448   TryConnect();
 449 }
 450
 451 void Printer::OnAccesstokenReceviced(const std::string& access_token,
 452                                      int expires_in_seconds) {
 453   VLOG(3) << "Function: " << __FUNCTION__;
 454   RememberAccessToken(access_token, expires_in_seconds);
 455   switch (connection_state_) {
 456     case ONLINE:
 457       PostOnIdle();
 458       break;
 459
 460     case CONNECTING:
 461       TryConnect();
 462       break;
 463
 464     default:
 465       NOTREACHED();
 466   }
 467 }
 468
 469 void Printer::OnXmppJidReceived(const std::string& xmpp_jid) {
 470   state_.xmpp_jid = xmpp_jid;
 471 }
 472
 473 void Printer::OnRegistrationError(const std::string& description) {
 474   LOG(ERROR) << "server_error: " << description;
 475
 476   SetRegistrationError(description);
 477 }
 478
 479 void Printer::OnNetworkError() {
 480   VLOG(3) << "Function: " << __FUNCTION__;
 481   FallOffline(false);
 482 }
 483
 484 void Printer::OnServerError(const std::string& description) {
 485   VLOG(3) << "Function: " << __FUNCTION__;
 486   LOG(ERROR) << "Server error: " << description;
 487   FallOffline(false);
 488 }
 489
 490 void Printer::OnPrintJobsAvailable(const std::vector<Job>& jobs) {
 491   VLOG(3) << "Function: " << __FUNCTION__;
 492
 493   VLOG(0) << "Available printjobs: " << jobs.size();
 494   if (jobs.empty()) {
 495     pending_print_jobs_check_ = false;
 496     PostOnIdle();
 497     return;
 498   }
 499
 500   VLOG(0) << "Downloading printjob.";
 501   requester_->RequestPrintJob(jobs[0]);
 502   return;
 503 }
 504
 505 void Printer::OnPrintJobDownloaded(const Job& job) {
 506   VLOG(3) << "Function: " << __FUNCTION__;
 507   print_job_handler_->SavePrintJob(job.file, job.ticket, job.create_time,
 508                                    job.job_id, job.title, "pdf");
 509   requester_->SendPrintJobDone(job.job_id);
 510 }
 511
 512 void Printer::OnPrintJobDone() {
 513   VLOG(3) << "Function: " << __FUNCTION__;
 514   PostOnIdle();
 515 }
 516
 517 void Printer::OnLocalSettingsReceived(LocalSettings::State state,
 518                                       const LocalSettings& settings) {
 519   pending_local_settings_check_ = false;
 520   switch (state) {
 521     case LocalSettings::CURRENT:
 522       VLOG(0) << "No new local settings";
 523       PostOnIdle();
 524       break;
 525     case LocalSettings::PENDING:
 526       VLOG(0) << "New local settings were received";
 527       ApplyLocalSettings(settings);
 528       break;
 529     case LocalSettings::PRINTER_DELETED:
 530       LOG(WARNING) << "Printer was deleted on server";
 531       pending_deletion_ = true;
 532       PostOnIdle();
 533       break;
 534
 535     default:
 536       NOTREACHED();
 537   }
 538 }
 539
 540 void Printer::OnLocalSettingsUpdated() {
 541   PostOnIdle();
 542 }
 543
 544 void Printer::OnXmppConnected() {
 545   pending_local_settings_check_ = true;
 546   pending_print_jobs_check_ = true;
 547   ChangeState(ONLINE);
 548   PostOnIdle();
 549 }
 550
 551 void Printer::OnXmppAuthError() {
 552   OnAuthError();
 553 }
 554
 555 void Printer::OnXmppNetworkError() {
 556   FallOffline(false);
 557 }
 558
 559 void Printer::OnXmppNewPrintJob(const std::string& device_id) {
 560   DCHECK_EQ(state_.device_id, device_id) << "Data should contain printer_id";
 561   pending_print_jobs_check_ = true;
 562 }
 563
 564 void Printer::OnXmppNewLocalSettings(const std::string& device_id) {
 565   DCHECK_EQ(state_.device_id, device_id) << "Data should contain printer_id";
 566   pending_local_settings_check_ = true;
 567 }
 568
 569 void Printer::OnXmppDeleteNotification(const std::string& device_id) {
 570   DCHECK_EQ(state_.device_id, device_id) << "Data should contain printer_id";
 571   pending_deletion_ = true;
 572 }
 573
 574 void Printer::TryConnect() {
 575   VLOG(3) << "Function: " << __FUNCTION__;
 576
 577   ChangeState(CONNECTING);
 578   if (!requester_)
 579     requester_.reset(new CloudPrintRequester(GetTaskRunner(), this));
 580
 581   if (IsRegistered()) {
 582     if (state_.access_token_update < base::Time::Now()) {
 583       requester_->UpdateAccesstoken(state_.refresh_token);
 584     } else {
 585       ConnectXmpp();
 586     }
 587   } else {
 588     // TODO(maksymb): Ping google.com to check connection state.
 589     ChangeState(ONLINE);
 590   }
 591 }
 592
 593 void Printer::ConnectXmpp() {
 594   xmpp_listener_.reset(
 595       new CloudPrintXmppListener(state_.xmpp_jid,
 596                                  state_.local_settings.xmpp_timeout_value,
 597                                  GetTaskRunner(), this));
 598   xmpp_listener_->Connect(state_.access_token);
 599 }
 600
 601 void Printer::OnIdle() {
 602   DCHECK(IsRegistered());
 603   DCHECK(on_idle_posted_) << "Instant call is not allowed";
 604   on_idle_posted_ = false;
 605
 606   if (connection_state_ != ONLINE)
 607     return;
 608
 609   if (pending_deletion_) {
 610     OnPrinterDeleted();
 611     return;
 612   }
 613
 614   if (state_.access_token_update < base::Time::Now()) {
 615     requester_->UpdateAccesstoken(state_.refresh_token);
 616     return;
 617   }
 618
 619   // TODO(maksymb): Check if privet-accesstoken was requested.
 620
 621   if (pending_local_settings_check_) {
 622     GetLocalSettings();
 623     return;
 624   }
 625
 626   if (pending_print_jobs_check_) {
 627     FetchPrintJobs();
 628     return;
 629   }
 630
 631   base::MessageLoop::current()->PostDelayedTask(
 632         FROM_HERE,
 633         base::Bind(&Printer::PostOnIdle, AsWeakPtr()),
 634         base::TimeDelta::FromMilliseconds(1000));
 635 }
 636
 637 void Printer::FetchPrintJobs() {
 638   VLOG(3) << "Function: " << __FUNCTION__;
 639   DCHECK(IsRegistered());
 640   requester_->FetchPrintJobs(state_.device_id);
 641 }
 642
 643 void Printer::GetLocalSettings() {
 644   VLOG(3) << "Function: " << __FUNCTION__;
 645   DCHECK(IsRegistered());
 646   requester_->RequestLocalSettings(state_.device_id);
 647 }
 648
 649 void Printer::ApplyLocalSettings(const LocalSettings& settings) {
 650   state_.local_settings = settings;
 651   SaveToFile();
 652
 653   if (state_.local_settings.local_discovery) {
 654     bool success = StartLocalDiscoveryServers();
 655     if (!success)
 656       LOG(ERROR) << "Local discovery servers cannot be started";
 657     // TODO(maksymb): If start failed try to start them again after some timeout
 658   } else {
 659     dns_server_.Shutdown();
 660     http_server_.Shutdown();
 661   }
 662   xmpp_listener_->set_ping_interval(state_.local_settings.xmpp_timeout_value);
 663
 664   requester_->SendLocalSettings(state_.device_id, state_.local_settings);
 665 }
 666
 667 void Printer::OnPrinterDeleted() {
 668   pending_deletion_ = false;
 669
 670   state_ = PrinterState();
 671
 672   SaveToFile();
 673   Stop();
 674   Start();
 675 }
 676
 677 void Printer::RememberAccessToken(const std::string& access_token,
 678                                   int expires_in_seconds) {
 679   using base::Time;
 680   using base::TimeDelta;
 681   state_.access_token = access_token;
 682   int64 time_to_update = static_cast<int64>(expires_in_seconds *
 683                                             kTimeToNextAccessTokenUpdate);
 684   state_.access_token_update =
 685       Time::Now() + TimeDelta::FromSeconds(time_to_update);
 686   VLOG(0) << "Current access_token: " << access_token;
 687   SaveToFile();
 688 }
 689
 690 void Printer::SetRegistrationError(const std::string& description) {
 691   DCHECK(!IsRegistered());
 692   state_.registration_state = PrinterState::REGISTRATION_ERROR;
 693   state_.error_description = description;
 694 }
 695
 696 PrivetHttpServer::RegistrationErrorStatus Printer::CheckCommonRegErrors(
 697     const std::string& user) {
 698   CheckRegistrationExpiration();
 699   DCHECK(!IsRegistered());
 700   if (connection_state_ != ONLINE)
 701     return PrivetHttpServer::REG_ERROR_OFFLINE;
 702
 703   if (state_.registration_state != PrinterState::UNREGISTERED &&
 704       user != state_.user) {
 705     return PrivetHttpServer::REG_ERROR_DEVICE_BUSY;
 706   }
 707
 708   if (state_.registration_state == PrinterState::REGISTRATION_ERROR)
 709     return PrivetHttpServer::REG_ERROR_SERVER_ERROR;
 710
 711   DCHECK_EQ(connection_state_, ONLINE);
 712
 713   return PrivetHttpServer::REG_ERROR_OK;
 714 }
 715
 716 void Printer::WaitUserConfirmation(base::Time valid_until) {
 717   // TODO(maksymb): Move to separate class.
 718
 719   if (base::Time::Now() > valid_until) {
 720     state_.confirmation_state = PrinterState::CONFIRMATION_TIMEOUT;
 721     VLOG(0) << "Confirmation timeout reached.";
 722     return;
 723   }
 724
 725   if (_kbhit()) {
 726     int c = _getche();
 727     if (c == 'y' || c == 'Y') {
 728       state_.confirmation_state = PrinterState::CONFIRMATION_CONFIRMED;
 729       VLOG(0) << "Registration confirmed by user.";
 730     } else {
 731       state_.confirmation_state = PrinterState::CONFIRMATION_DISCARDED;
 732       VLOG(0) << "Registration discarded by user.";
 733     }
 734     return;
 735   }
 736
 737   base::MessageLoop::current()->PostDelayedTask(
 738       FROM_HERE,
 739       base::Bind(&Printer::WaitUserConfirmation, AsWeakPtr(), valid_until),
 740       base::TimeDelta::FromMilliseconds(100));
 741 }
 742
 743 std::string Printer::GenerateProxyId() const {
 744   return "{" + base::GenerateGUID() +"}";
 745 }
 746
 747 std::vector<std::string> Printer::CreateTxt() const {
 748   std::vector<std::string> txt;
 749   txt.push_back("txtvers=1");
 750   txt.push_back("ty=" + std::string(kPrinterName));
 751   txt.push_back("note=" + std::string(GetDescription()));
 752   txt.push_back("url=" + std::string(kCloudPrintUrl));
 753   txt.push_back("type=printer");
 754   txt.push_back("id=" + state_.device_id);
 755   txt.push_back("cs=" + ConnectionStateToString(connection_state_));
 756
 757   return txt;
 758 }
 759
 760 void Printer::SaveToFile() {
 761   GetCapabilities();  // Make sure capabilities created.
 762   base::FilePath file_path;
 763   file_path = file_path.AppendASCII(
 764       command_line_reader::ReadStatePath(kPrinterStatePathDefault));
 765
 766   if (printer_state::SaveToFile(file_path, state_)) {
 767     VLOG(0) << "Printer state written to file";
 768   } else {
 769     VLOG(0) << "Cannot write printer state to file";
 770   }
 771 }
 772
 773 bool Printer::LoadFromFile() {
 774   state_ = PrinterState();
 775
 776   base::FilePath file_path;
 777   file_path = file_path.AppendASCII(
 778       command_line_reader::ReadStatePath(kPrinterStatePathDefault));
 779
 780   if (!base::PathExists(file_path)) {
 781     VLOG(0) << "Printer state file not found";
 782     return false;
 783   }
 784
 785   if (printer_state::LoadFromFile(file_path, &state_)) {
 786     VLOG(0) << "Printer state loaded from file";
 787     SaveToFile();
 788   } else {
 789     VLOG(0) << "Reading/parsing printer state from file failed";
 790   }
 791
 792   return true;
 793 }
 794
 795 void Printer::PostOnIdle() {
 796   VLOG(3) << "Function: " << __FUNCTION__;
 797   DCHECK(!on_idle_posted_) << "Only one instance can be posted.";
 798   on_idle_posted_ = true;
 799
 800   base::MessageLoop::current()->PostTask(
 801       FROM_HERE,
 802       base::Bind(&Printer::OnIdle, AsWeakPtr()));
 803 }
 804
 805 void Printer::CheckRegistrationExpiration() {
 806   if (!registration_expiration_.is_null() &&
 807       registration_expiration_ < base::Time::Now()) {
 808     state_ = PrinterState();
 809     InvalidateRegistrationExpiration();
 810   }
 811 }
 812
 813 void Printer::UpdateRegistrationExpiration() {
 814   registration_expiration_ =
 815       base::Time::Now() + base::TimeDelta::FromSeconds(kRegistrationTimeout);
 816 }
 817
 818 void Printer::InvalidateRegistrationExpiration() {
 819   registration_expiration_ = base::Time();
 820 }
 821
 822 bool Printer::StartLocalDiscoveryServers() {
 823   if (!StartHttpServer())
 824     return false;
 825   if (!StartDnsServer()) {
 826     http_server_.Shutdown();
 827     return false;
 828   }
 829   return true;
 830 }
 831
 832 bool Printer::StartDnsServer() {
 833   DCHECK(state_.local_settings.local_discovery);
 834
 835   // TODO(maksymb): Add switch for command line to control interface name.
 836   net::IPAddressNumber ip = GetLocalIp("", false);
 837   if (ip.empty()) {
 838     LOG(ERROR) << "No local IP found. Cannot start printer.";
 839     return false;
 840   }
 841   VLOG(0) << "Local address: " << net::IPAddressToString(ip);
 842
 843   uint16 port = command_line_reader::ReadHttpPort(kHttpPortDefault);
 844
 845   std::string service_name_prefix =
 846       command_line_reader::ReadServiceNamePrefix(kServiceNamePrefixDefault +
 847                                                  net::IPAddressToString(ip));
 848   std::replace(service_name_prefix .begin(), service_name_prefix .end(),
 849                '.', '_');
 850
 851   std::string service_domain_name =
 852       command_line_reader::ReadDomainName(
 853           base::StringPrintf(kServiceDomainNameFormatDefault,
 854                              base::RandInt(0, INT_MAX)));
 855
 856   ServiceParameters params(kServiceType, kSecondaryServiceType,
 857                            service_name_prefix, service_domain_name,
 858                            ip, GetLocalIp("", true), port);
 859
 860   return dns_server_.Start(params,
 861                            command_line_reader::ReadTtl(kTtlDefault),
 862                            CreateTxt());
 863 }
 864
 865 bool Printer::StartHttpServer() {
 866   DCHECK(state_.local_settings.local_discovery);
 867   using command_line_reader::ReadHttpPort;
 868   return http_server_.Start(ReadHttpPort(kHttpPortDefault));
 869 }
 870
 871 PrivetHttpServer::RegistrationErrorStatus
 872 Printer::ConfirmationToRegistrationError(
 873     PrinterState::ConfirmationState state) {
 874   switch (state) {
 875     case PrinterState::CONFIRMATION_PENDING:
 876       return PrivetHttpServer::REG_ERROR_PENDING_USER_ACTION;
 877     case PrinterState::CONFIRMATION_DISCARDED:
 878       return PrivetHttpServer::REG_ERROR_USER_CANCEL;
 879     case PrinterState::CONFIRMATION_CONFIRMED:
 880       NOTREACHED();
 881       return PrivetHttpServer::REG_ERROR_OK;
 882     case PrinterState::CONFIRMATION_TIMEOUT:
 883       return PrivetHttpServer::REG_ERROR_CONFIRMATION_TIMEOUT;
 884     default:
 885       NOTREACHED();
 886       return PrivetHttpServer::REG_ERROR_OK;
 887   }
 888 }
 889
 890 std::string Printer::ConnectionStateToString(ConnectionState state) const {
 891   switch (state) {
 892     case OFFLINE:
 893       return "offline";
 894     case ONLINE:
 895       return "online";
 896     case CONNECTING:
 897       return "connecting";
 898     case NOT_CONFIGURED:
 899       return "not-configured";
 900
 901     default:
 902       NOTREACHED();
 903       return "";
 904   }
 905 }
 906
 907 void Printer::FallOffline(bool instant_reconnect) {
 908   bool changed = ChangeState(OFFLINE);
 909   DCHECK(changed) << "Falling offline from offline is now allowed";
 910
 911   if (!IsRegistered())
 912     SetRegistrationError("Cannot access server during registration process");
 913
 914   if (instant_reconnect) {
 915     TryConnect();
 916   } else {
 917     base::MessageLoop::current()->PostDelayedTask(
 918         FROM_HERE,
 919         base::Bind(&Printer::TryConnect, AsWeakPtr()),
 920         base::TimeDelta::FromSeconds(kReconnectTimeout));
 921   }
 922 }
 923
 924 bool Printer::ChangeState(ConnectionState new_state) {
 925   if (connection_state_ == new_state)
 926     return false;
 927
 928   connection_state_ = new_state;
 929   VLOG(0) << base::StringPrintf(
 930       "Printer is now %s (%s)",
 931       ConnectionStateToString(connection_state_).c_str(),
 932       IsRegistered() ? "registered" : "unregistered");
 933
 934   dns_server_.UpdateMetadata(CreateTxt());
 935
 936   if (connection_state_ == OFFLINE) {
 937     requester_.reset();
 938     xmpp_listener_.reset();
 939   }
 940
 941   return true;
 942 }