1868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles)// Copyright 2013 The Chromium Authors. All rights reserved. 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Use of this source code is governed by a BSD-style license that can be 35821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// found in the LICENSE file. 45821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 51320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci#include "media/blink/cache_util.h" 65821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include <string> 85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 9c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)#include "base/strings/string_number_conversions.h" 107d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles)#include "base/strings/string_util.h" 11eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch#include "base/time/time.h" 125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "net/http/http_util.h" 135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "net/http/http_version.h" 14868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles)#include "third_party/WebKit/public/platform/WebCString.h" 15868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles)#include "third_party/WebKit/public/platform/WebString.h" 16868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles)#include "third_party/WebKit/public/platform/WebURLResponse.h" 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)using base::Time; 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)using base::TimeDelta; 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)using net::HttpVersion; 21f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles)using blink::WebURLResponse; 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 231320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tuccinamespace media { 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)enum { kHttpOK = 200, kHttpPartialContent = 206 }; 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)uint32 GetReasonsForUncacheability(const WebURLResponse& response) { 285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) uint32 reasons = 0; 295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const int code = response.httpStatusCode(); 305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const int version = response.httpVersion(); 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const HttpVersion http_version = 325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) version == WebURLResponse::HTTP_1_1 ? HttpVersion(1, 1) : 335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) version == WebURLResponse::HTTP_1_0 ? HttpVersion(1, 0) : 345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) version == WebURLResponse::HTTP_0_9 ? HttpVersion(0, 9) : 355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) HttpVersion(); 365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (code != kHttpOK && code != kHttpPartialContent) 375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) reasons |= kNoData; 385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (http_version < HttpVersion(1, 1) && code == kHttpPartialContent) 395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) reasons |= kPre11PartialResponse; 405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (code == kHttpPartialContent && 415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) !net::HttpUtil::HasStrongValidators( 425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) http_version, 435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) response.httpHeaderField("etag").utf8(), 445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) response.httpHeaderField("Last-Modified").utf8(), 455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) response.httpHeaderField("Date").utf8())) { 465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) reasons |= kNoStrongValidatorOnPartialResponse; 475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) std::string cache_control_header = 505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) response.httpHeaderField("cache-control").utf8(); 516e8cce623b6e4fe0c9e4af605d675dd9d0338c38Torne (Richard Coles) base::StringToLowerASCII(&cache_control_header); 525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (cache_control_header.find("no-cache") != std::string::npos) 535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) reasons |= kNoCache; 545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (cache_control_header.find("no-store") != std::string::npos) 555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) reasons |= kNoStore; 565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (cache_control_header.find("must-revalidate") != std::string::npos) 575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) reasons |= kHasMustRevalidate; 585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const TimeDelta kMinimumAgeForUsefulness = 605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) TimeDelta::FromSeconds(3600); // Arbitrary value. 615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const char kMaxAgePrefix[] = "max-age="; 635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const size_t kMaxAgePrefixLen = arraysize(kMaxAgePrefix) - 1; 645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (cache_control_header.substr(0, kMaxAgePrefixLen) == kMaxAgePrefix) { 655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int64 max_age_seconds; 665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) base::StringToInt64( 675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) base::StringPiece(cache_control_header.begin() + kMaxAgePrefixLen, 685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) cache_control_header.end()), 695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) &max_age_seconds); 705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (TimeDelta::FromSeconds(max_age_seconds) < kMinimumAgeForUsefulness) 715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) reasons |= kShortMaxAge; 725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Time date; 755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Time expires; 765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (Time::FromString(response.httpHeaderField("Date").utf8().data(), &date) && 775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) Time::FromString(response.httpHeaderField("Expires").utf8().data(), 785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) &expires) && 795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) date > Time() && expires > Time() && 805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) (expires - date) < kMinimumAgeForUsefulness) { 815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) reasons |= kExpiresTooSoon; 825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return reasons; 855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 871320f92c476a1ad9d19dba2a48c72b75566198e9Primiano Tucci} // namespace media 88