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| 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 "chrome/browser/local_discovery/privet_url_fetcher.h" | |
| 6 | |
| 7 #include <stdint.h> | |
| 8 | |
| 9 #include <algorithm> | |
| 10 #include <limits> | |
| 11 | |
| 12 #include "base/bind.h" | |
| 13 #include "base/debug/dump_without_crashing.h" | |
| 14 #include "base/json/json_reader.h" | |
| 15 #include "base/location.h" | |
| 16 #include "base/memory/singleton.h" | |
| 17 #include "base/rand_util.h" | |
| 18 #include "base/single_thread_task_runner.h" | |
| 19 #include "base/strings/stringprintf.h" | |
| 20 #include "base/thread_task_runner_handle.h" | |
| 21 #include "chrome/browser/browser_process.h" | |
| 22 #include "chrome/browser/local_discovery/privet_constants.h" | |
| 23 #include "content/public/browser/browser_thread.h" | |
| 24 #include "net/base/load_flags.h" | |
| 25 #include "net/http/http_status_code.h" | |
| 26 #include "net/url_request/url_request_context.h" | |
| 27 #include "net/url_request/url_request_status.h" | |
| 28 | |
| 29 namespace local_discovery { | |
| 30 | |
| 31 namespace { | |
| 32 | |
| 33 typedef std::map<std::string, std::string> TokenMap; | |
| 34 | |
| 35 struct TokenMapHolder { | |
| 36 public: | |
| 37 static TokenMapHolder* GetInstance() { | |
| 38 return base::Singleton<TokenMapHolder>::get(); | |
| 39 } | |
| 40 | |
| 41 TokenMap map; | |
| 42 }; | |
| 43 | |
| 44 const char kXPrivetTokenHeaderPrefix[] = "X-Privet-Token: "; | |
| 45 const char kRangeHeaderFormat[] = "Range: bytes=%d-%d"; | |
| 46 const char kXPrivetEmptyToken[] = "\"\""; | |
| 47 const int kPrivetMaxRetries = 20; | |
| 48 const int kPrivetTimeoutOnError = 5; | |
| 49 const int kHTTPErrorCodeInvalidXPrivetToken = 418; | |
| 50 | |
| 51 std::string MakeRangeHeader(int start, int end) { | |
| 52 DCHECK_GE(start, 0); | |
| 53 DCHECK_GT(end, 0); | |
| 54 DCHECK_GT(end, start); | |
| 55 return base::StringPrintf(kRangeHeaderFormat, start, end); | |
| 56 } | |
| 57 | |
| 58 } // namespace | |
| 59 | |
| 60 void PrivetURLFetcher::Delegate::OnNeedPrivetToken( | |
| 61 PrivetURLFetcher* fetcher, | |
| 62 const TokenCallback& callback) { | |
| 63 OnError(fetcher, TOKEN_ERROR); | |
| 64 } | |
| 65 | |
| 66 bool PrivetURLFetcher::Delegate::OnRawData(PrivetURLFetcher* fetcher, | |
| 67 bool response_is_file, | |
| 68 const std::string& data_string, | |
| 69 const base::FilePath& data_file) { | |
| 70 return false; | |
| 71 } | |
| 72 | |
| 73 PrivetURLFetcher::PrivetURLFetcher( | |
| 74 const GURL& url, | |
| 75 net::URLFetcher::RequestType request_type, | |
| 76 const scoped_refptr<net::URLRequestContextGetter>& context_getter, | |
| 77 PrivetURLFetcher::Delegate* delegate) | |
| 78 : url_(url), | |
| 79 request_type_(request_type), | |
| 80 context_getter_(context_getter), | |
| 81 delegate_(delegate), | |
| 82 max_retries_(kPrivetMaxRetries), | |
| 83 do_not_retry_on_transient_error_(false), | |
| 84 send_empty_privet_token_(false), | |
| 85 has_byte_range_(false), | |
| 86 make_response_file_(false), | |
| 87 byte_range_start_(0), | |
| 88 byte_range_end_(0), | |
| 89 tries_(0), | |
| 90 weak_factory_(this) {} | |
| 91 | |
| 92 PrivetURLFetcher::~PrivetURLFetcher() { | |
| 93 } | |
| 94 | |
| 95 // static | |
| 96 void PrivetURLFetcher::SetTokenForHost(const std::string& host, | |
| 97 const std::string& token) { | |
| 98 TokenMapHolder::GetInstance()->map[host] = token; | |
| 99 } | |
| 100 | |
| 101 // static | |
| 102 void PrivetURLFetcher::ResetTokenMapForTests() { | |
| 103 TokenMapHolder::GetInstance()->map.clear(); | |
| 104 } | |
| 105 | |
| 106 void PrivetURLFetcher::SetMaxRetries(int max_retries) { | |
| 107 DCHECK_EQ(tries_, 0); | |
| 108 max_retries_ = max_retries; | |
| 109 } | |
| 110 | |
| 111 void PrivetURLFetcher::DoNotRetryOnTransientError() { | |
| 112 DCHECK_EQ(tries_, 0); | |
| 113 do_not_retry_on_transient_error_ = true; | |
| 114 } | |
| 115 | |
| 116 void PrivetURLFetcher::SendEmptyPrivetToken() { | |
| 117 DCHECK_EQ(tries_, 0); | |
| 118 send_empty_privet_token_ = true; | |
| 119 } | |
| 120 | |
| 121 std::string PrivetURLFetcher::GetPrivetAccessToken() { | |
| 122 if (send_empty_privet_token_) { | |
| 123 return std::string(); | |
| 124 } | |
| 125 | |
| 126 TokenMapHolder* token_map_holder = TokenMapHolder::GetInstance(); | |
| 127 TokenMap::iterator found = token_map_holder->map.find(GetHostString()); | |
| 128 return found != token_map_holder->map.end() ? found->second : std::string(); | |
| 129 } | |
| 130 | |
| 131 std::string PrivetURLFetcher::GetHostString() { | |
| 132 return url_.GetOrigin().spec(); | |
| 133 } | |
| 134 | |
| 135 void PrivetURLFetcher::SaveResponseToFile() { | |
| 136 DCHECK_EQ(tries_, 0); | |
| 137 make_response_file_ = true; | |
| 138 } | |
| 139 | |
| 140 void PrivetURLFetcher::SetByteRange(int start, int end) { | |
| 141 DCHECK_EQ(tries_, 0); | |
| 142 byte_range_start_ = start; | |
| 143 byte_range_end_ = end; | |
| 144 has_byte_range_ = true; | |
| 145 } | |
| 146 | |
| 147 void PrivetURLFetcher::Try() { | |
| 148 tries_++; | |
| 149 if (tries_ <= max_retries_) { | |
| 150 DVLOG(1) << "Attempt: " << tries_; | |
| 151 url_fetcher_ = net::URLFetcher::Create(url_, request_type_, this); | |
| 152 // Privet requests are relevant to hosts on local network only. | |
| 153 url_fetcher_->SetLoadFlags( | |
| 154 url_fetcher_->GetLoadFlags() | net::LOAD_BYPASS_PROXY | | |
| 155 net::LOAD_DISABLE_CACHE | net::LOAD_DO_NOT_SEND_COOKIES); | |
| 156 url_fetcher_->SetRequestContext(context_getter_.get()); | |
| 157 | |
| 158 std::string token = GetPrivetAccessToken(); | |
| 159 | |
| 160 if (token.empty()) | |
| 161 token = kXPrivetEmptyToken; | |
| 162 | |
| 163 url_fetcher_->AddExtraRequestHeader( | |
| 164 std::string(kXPrivetTokenHeaderPrefix) + token); | |
| 165 | |
| 166 if (has_byte_range_) { | |
| 167 url_fetcher_->AddExtraRequestHeader( | |
| 168 MakeRangeHeader(byte_range_start_, byte_range_end_)); | |
| 169 } | |
| 170 | |
| 171 if (make_response_file_) { | |
| 172 url_fetcher_->SaveResponseToTemporaryFile( | |
| 173 content::BrowserThread::GetMessageLoopProxyForThread( | |
| 174 content::BrowserThread::FILE)); | |
| 175 } | |
| 176 | |
| 177 // URLFetcher requires us to set upload data for POST requests. | |
| 178 if (request_type_ == net::URLFetcher::POST) { | |
| 179 if (!upload_file_path_.empty()) { | |
| 180 url_fetcher_->SetUploadFilePath( | |
| 181 upload_content_type_, upload_file_path_, 0 /*offset*/, | |
| 182 std::numeric_limits<uint64_t>::max() /*length*/, | |
| 183 content::BrowserThread::GetMessageLoopProxyForThread( | |
| 184 content::BrowserThread::FILE)); | |
| 185 } else { | |
| 186 url_fetcher_->SetUploadData(upload_content_type_, upload_data_); | |
| 187 } | |
| 188 } | |
| 189 | |
| 190 url_fetcher_->Start(); | |
| 191 } else { | |
| 192 delegate_->OnError(this, UNKNOWN_ERROR); | |
| 193 } | |
| 194 } | |
| 195 | |
| 196 void PrivetURLFetcher::Start() { | |
| 197 DCHECK_EQ(tries_, 0); // We haven't called |Start()| yet. | |
| 198 | |
| 199 if (!url_.is_valid()) { | |
| 200 // Not yet clear why it's possible. crbug.com/513505 | |
| 201 base::debug::DumpWithoutCrashing(); | |
| 202 return delegate_->OnError(this, UNKNOWN_ERROR); | |
| 203 } | |
| 204 | |
| 205 if (!send_empty_privet_token_) { | |
| 206 std::string privet_access_token; | |
| 207 privet_access_token = GetPrivetAccessToken(); | |
| 208 if (privet_access_token.empty()) { | |
| 209 RequestTokenRefresh(); | |
| 210 return; | |
| 211 } | |
| 212 } | |
| 213 | |
| 214 Try(); | |
| 215 } | |
| 216 | |
| 217 void PrivetURLFetcher::SetUploadData(const std::string& upload_content_type, | |
| 218 const std::string& upload_data) { | |
| 219 DCHECK(upload_file_path_.empty()); | |
| 220 upload_content_type_ = upload_content_type; | |
| 221 upload_data_ = upload_data; | |
| 222 } | |
| 223 | |
| 224 void PrivetURLFetcher::SetUploadFilePath( | |
| 225 const std::string& upload_content_type, | |
| 226 const base::FilePath& upload_file_path) { | |
| 227 DCHECK(upload_data_.empty()); | |
| 228 upload_content_type_ = upload_content_type; | |
| 229 upload_file_path_ = upload_file_path; | |
| 230 } | |
| 231 | |
| 232 void PrivetURLFetcher::OnURLFetchComplete(const net::URLFetcher* source) { | |
| 233 DVLOG(1) << "Status: " << source->GetStatus().status() | |
| 234 << ", ResponseCode: " << source->GetResponseCode(); | |
| 235 if (source->GetStatus().status() != net::URLRequestStatus::CANCELED && | |
| 236 (source->GetResponseCode() == net::HTTP_SERVICE_UNAVAILABLE || | |
| 237 source->GetResponseCode() == net::URLFetcher::RESPONSE_CODE_INVALID)) { | |
| 238 ScheduleRetry(kPrivetTimeoutOnError); | |
| 239 return; | |
| 240 } | |
| 241 | |
| 242 if (!OnURLFetchCompleteDoNotParseData(source)) { | |
| 243 // Byte ranges should only be used when we're not parsing the data | |
| 244 // as JSON. | |
| 245 DCHECK(!has_byte_range_); | |
| 246 | |
| 247 // We should only be saving raw data to a file. | |
| 248 DCHECK(!make_response_file_); | |
| 249 | |
| 250 OnURLFetchCompleteParseData(source); | |
| 251 } | |
| 252 } | |
| 253 | |
| 254 // Note that this function returns "true" in error cases to indicate | |
| 255 // that it has fully handled the responses. | |
| 256 bool PrivetURLFetcher::OnURLFetchCompleteDoNotParseData( | |
| 257 const net::URLFetcher* source) { | |
| 258 if (source->GetStatus().status() == net::URLRequestStatus::CANCELED) { | |
| 259 delegate_->OnError(this, REQUEST_CANCELED); | |
| 260 return true; | |
| 261 } | |
| 262 | |
| 263 if (source->GetResponseCode() == kHTTPErrorCodeInvalidXPrivetToken) { | |
| 264 RequestTokenRefresh(); | |
| 265 return true; | |
| 266 } | |
| 267 | |
| 268 if (source->GetResponseCode() != net::HTTP_OK && | |
| 269 source->GetResponseCode() != net::HTTP_PARTIAL_CONTENT && | |
| 270 source->GetResponseCode() != net::HTTP_BAD_REQUEST) { | |
| 271 delegate_->OnError(this, RESPONSE_CODE_ERROR); | |
| 272 return true; | |
| 273 } | |
| 274 | |
| 275 if (make_response_file_) { | |
| 276 base::FilePath response_file_path; | |
| 277 | |
| 278 if (!source->GetResponseAsFilePath(true, &response_file_path)) { | |
| 279 delegate_->OnError(this, UNKNOWN_ERROR); | |
| 280 return true; | |
| 281 } | |
| 282 | |
| 283 return delegate_->OnRawData(this, true, std::string(), response_file_path); | |
| 284 } else { | |
| 285 std::string response_str; | |
| 286 | |
| 287 if (!source->GetResponseAsString(&response_str)) { | |
| 288 delegate_->OnError(this, UNKNOWN_ERROR); | |
| 289 return true; | |
| 290 } | |
| 291 | |
| 292 return delegate_->OnRawData(this, false, response_str, base::FilePath()); | |
| 293 } | |
| 294 } | |
| 295 | |
| 296 void PrivetURLFetcher::OnURLFetchCompleteParseData( | |
| 297 const net::URLFetcher* source) { | |
| 298 // Response contains error description. | |
| 299 bool is_error_response = false; | |
| 300 if (source->GetResponseCode() != net::HTTP_OK) { | |
| 301 delegate_->OnError(this, RESPONSE_CODE_ERROR); | |
| 302 return; | |
| 303 } | |
| 304 | |
| 305 std::string response_str; | |
| 306 if (!source->GetResponseAsString(&response_str)) { | |
| 307 delegate_->OnError(this, UNKNOWN_ERROR); | |
| 308 return; | |
| 309 } | |
| 310 | |
| 311 base::JSONReader json_reader(base::JSON_ALLOW_TRAILING_COMMAS); | |
| 312 scoped_ptr<base::Value> value = json_reader.ReadToValue(response_str); | |
| 313 if (!value) { | |
| 314 delegate_->OnError(this, JSON_PARSE_ERROR); | |
| 315 return; | |
| 316 } | |
| 317 | |
| 318 const base::DictionaryValue* dictionary_value = NULL; | |
| 319 | |
| 320 if (!value->GetAsDictionary(&dictionary_value)) { | |
| 321 delegate_->OnError(this, JSON_PARSE_ERROR); | |
| 322 return; | |
| 323 } | |
| 324 | |
| 325 std::string error; | |
| 326 if (dictionary_value->GetString(kPrivetKeyError, &error)) { | |
| 327 if (error == kPrivetErrorInvalidXPrivetToken) { | |
| 328 RequestTokenRefresh(); | |
| 329 return; | |
| 330 } else if (PrivetErrorTransient(error)) { | |
| 331 if (!do_not_retry_on_transient_error_) { | |
| 332 int timeout_seconds; | |
| 333 if (!dictionary_value->GetInteger(kPrivetKeyTimeout, | |
| 334 &timeout_seconds)) { | |
| 335 timeout_seconds = kPrivetDefaultTimeout; | |
| 336 } | |
| 337 | |
| 338 ScheduleRetry(timeout_seconds); | |
| 339 return; | |
| 340 } | |
| 341 } | |
| 342 is_error_response = true; | |
| 343 } | |
| 344 | |
| 345 delegate_->OnParsedJson(this, *dictionary_value, is_error_response); | |
| 346 } | |
| 347 | |
| 348 void PrivetURLFetcher::ScheduleRetry(int timeout_seconds) { | |
| 349 double random_scaling_factor = | |
| 350 1 + base::RandDouble() * kPrivetMaximumTimeRandomAddition; | |
| 351 | |
| 352 int timeout_seconds_randomized = | |
| 353 static_cast<int>(timeout_seconds * random_scaling_factor); | |
| 354 | |
| 355 timeout_seconds_randomized = | |
| 356 std::max(timeout_seconds_randomized, kPrivetMinimumTimeout); | |
| 357 | |
| 358 // Don't wait because only error callback is going to be called. | |
| 359 if (tries_ >= max_retries_) | |
| 360 timeout_seconds_randomized = 0; | |
| 361 | |
| 362 base::ThreadTaskRunnerHandle::Get()->PostDelayedTask( | |
| 363 FROM_HERE, base::Bind(&PrivetURLFetcher::Try, weak_factory_.GetWeakPtr()), | |
| 364 base::TimeDelta::FromSeconds(timeout_seconds_randomized)); | |
| 365 } | |
| 366 | |
| 367 void PrivetURLFetcher::RequestTokenRefresh() { | |
| 368 delegate_->OnNeedPrivetToken( | |
| 369 this, | |
| 370 base::Bind(&PrivetURLFetcher::RefreshToken, weak_factory_.GetWeakPtr())); | |
| 371 } | |
| 372 | |
| 373 void PrivetURLFetcher::RefreshToken(const std::string& token) { | |
| 374 if (token.empty()) { | |
| 375 delegate_->OnError(this, TOKEN_ERROR); | |
| 376 } else { | |
| 377 SetTokenForHost(GetHostString(), token); | |
| 378 Try(); | |
| 379 } | |
| 380 } | |
| 381 | |
| 382 bool PrivetURLFetcher::PrivetErrorTransient(const std::string& error) { | |
| 383 return (error == kPrivetErrorDeviceBusy) || | |
| 384 (error == kPrivetV3ErrorDeviceBusy) || | |
| 385 (error == kPrivetErrorPendingUserAction) || | |
| 386 (error == kPrivetErrorPrinterBusy); | |
| 387 } | |
| 388 | |
| 389 } // namespace local_discovery | |
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Chromium Code Reviews
Issue 1553333002:
Move cloud print specific files out of local_discovery (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@moveprn