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| 1 // Copyright 2016 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 "pdf/url_loader_wrapper_impl.h" |
| 6 |
| 7 #include "base/logging.h" |
| 8 #include "base/memory/ptr_util.h" |
| 9 #include "base/strings/string_util.h" |
| 10 #include "base/strings/stringprintf.h" |
| 11 #include "net/http/http_util.h" |
| 12 #include "pdf/timer.h" |
| 13 #include "ppapi/c/pp_errors.h" |
| 14 #include "ppapi/cpp/logging.h" |
| 15 #include "ppapi/cpp/url_request_info.h" |
| 16 #include "ppapi/cpp/url_response_info.h" |
| 17 |
| 18 namespace chrome_pdf { |
| 19 |
| 20 namespace { |
| 21 // We should read with delay to prevent block UI thread, and reduce CPU usage. |
| 22 const int kReadDelayMs = 2; |
| 23 |
| 24 pp::URLRequestInfo MakeRangeRequest(pp::Instance* plugin_instance, |
| 25 const std::string& url, |
| 26 const std::string& referrer_url, |
| 27 uint32_t position, |
| 28 uint32_t size) { |
| 29 pp::URLRequestInfo request(plugin_instance); |
| 30 request.SetURL(url); |
| 31 request.SetMethod("GET"); |
| 32 request.SetFollowRedirects(false); |
| 33 request.SetCustomReferrerURL(referrer_url); |
| 34 |
| 35 // According to rfc2616, byte range specifies position of the first and last |
| 36 // bytes in the requested range inclusively. Therefore we should subtract 1 |
| 37 // from the position + size, to get index of the last byte that needs to be |
| 38 // downloaded. |
| 39 std::string str_header = |
| 40 base::StringPrintf("Range: bytes=%d-%d", position, position + size - 1); |
| 41 pp::Var header(str_header.c_str()); |
| 42 request.SetHeaders(header); |
| 43 |
| 44 return request; |
| 45 } |
| 46 |
| 47 bool GetByteRangeFromStr(const std::string& content_range_str, |
| 48 int* start, |
| 49 int* end) { |
| 50 std::string range = content_range_str; |
| 51 if (!base::StartsWith(range, "bytes", base::CompareCase::INSENSITIVE_ASCII)) |
| 52 return false; |
| 53 |
| 54 range = range.substr(strlen("bytes")); |
| 55 std::string::size_type pos = range.find('-'); |
| 56 std::string range_end; |
| 57 if (pos != std::string::npos) |
| 58 range_end = range.substr(pos + 1); |
| 59 base::TrimWhitespaceASCII(range, base::TRIM_LEADING, &range); |
| 60 base::TrimWhitespaceASCII(range_end, base::TRIM_LEADING, &range_end); |
| 61 *start = atoi(range.c_str()); |
| 62 *end = atoi(range_end.c_str()); |
| 63 return true; |
| 64 } |
| 65 |
| 66 // If the headers have a byte-range response, writes the start and end |
| 67 // positions and returns true if at least the start position was parsed. |
| 68 // The end position will be set to 0 if it was not found or parsed from the |
| 69 // response. |
| 70 // Returns false if not even a start position could be parsed. |
| 71 bool GetByteRangeFromHeaders(const std::string& headers, int* start, int* end) { |
| 72 net::HttpUtil::HeadersIterator it(headers.begin(), headers.end(), "\n"); |
| 73 while (it.GetNext()) { |
| 74 if (base::LowerCaseEqualsASCII(it.name(), "content-range")) { |
| 75 if (GetByteRangeFromStr(it.values().c_str(), start, end)) |
| 76 return true; |
| 77 } |
| 78 } |
| 79 return false; |
| 80 } |
| 81 |
| 82 } // namespace |
| 83 |
| 84 class URLLoaderWrapperImpl::ReadStarter : public Timer { |
| 85 public: |
| 86 explicit ReadStarter(URLLoaderWrapperImpl* owner) |
| 87 : Timer(kReadDelayMs), owner_(owner) {} |
| 88 ~ReadStarter() override {} |
| 89 |
| 90 // Timer overrides: |
| 91 void OnTimer() override { owner_->ReadResponseBodyImpl(); } |
| 92 |
| 93 private: |
| 94 URLLoaderWrapperImpl* owner_; |
| 95 }; |
| 96 |
| 97 URLLoaderWrapperImpl::URLLoaderWrapperImpl(pp::Instance* plugin_instance, |
| 98 const pp::URLLoader& url_loader) |
| 99 : plugin_instance_(plugin_instance), |
| 100 url_loader_(url_loader), |
| 101 callback_factory_(this) { |
| 102 SetHeadersFromLoader(); |
| 103 } |
| 104 |
| 105 URLLoaderWrapperImpl::~URLLoaderWrapperImpl() { |
| 106 Close(); |
| 107 } |
| 108 |
| 109 int URLLoaderWrapperImpl::GetContentLength() const { |
| 110 return content_length_; |
| 111 } |
| 112 |
| 113 bool URLLoaderWrapperImpl::IsAcceptRangesBytes() const { |
| 114 return accept_ranges_bytes_; |
| 115 } |
| 116 |
| 117 bool URLLoaderWrapperImpl::IsContentEncoded() const { |
| 118 return content_encoded_; |
| 119 } |
| 120 |
| 121 std::string URLLoaderWrapperImpl::GetContentType() const { |
| 122 return content_type_; |
| 123 } |
| 124 std::string URLLoaderWrapperImpl::GetContentDisposition() const { |
| 125 return content_disposition_; |
| 126 } |
| 127 |
| 128 int URLLoaderWrapperImpl::GetStatusCode() const { |
| 129 return url_loader_.GetResponseInfo().GetStatusCode(); |
| 130 } |
| 131 |
| 132 bool URLLoaderWrapperImpl::IsMultipart() const { |
| 133 return is_multipart_; |
| 134 } |
| 135 |
| 136 bool URLLoaderWrapperImpl::GetByteRange(int* start, int* end) const { |
| 137 DCHECK(start); |
| 138 DCHECK(end); |
| 139 *start = byte_range_.start(); |
| 140 *end = byte_range_.end(); |
| 141 return byte_range_.IsValid(); |
| 142 } |
| 143 |
| 144 bool URLLoaderWrapperImpl::GetDownloadProgress( |
| 145 int64_t* bytes_received, |
| 146 int64_t* total_bytes_to_be_received) const { |
| 147 return url_loader_.GetDownloadProgress(bytes_received, |
| 148 total_bytes_to_be_received); |
| 149 } |
| 150 |
| 151 void URLLoaderWrapperImpl::Close() { |
| 152 url_loader_.Close(); |
| 153 read_starter_.reset(); |
| 154 } |
| 155 |
| 156 void URLLoaderWrapperImpl::OpenRange(const std::string& url, |
| 157 const std::string& referrer_url, |
| 158 uint32_t position, |
| 159 uint32_t size, |
| 160 const pp::CompletionCallback& cc) { |
| 161 did_open_callback_ = cc; |
| 162 pp::CompletionCallback callback = |
| 163 callback_factory_.NewCallback(&URLLoaderWrapperImpl::DidOpen); |
| 164 int rv = url_loader_.Open( |
| 165 MakeRangeRequest(plugin_instance_, url, referrer_url, position, size), |
| 166 callback); |
| 167 if (rv != PP_OK_COMPLETIONPENDING) |
| 168 callback.Run(rv); |
| 169 } |
| 170 |
| 171 void URLLoaderWrapperImpl::ReadResponseBody(char* buffer, |
| 172 int buffer_size, |
| 173 const pp::CompletionCallback& cc) { |
| 174 did_read_callback_ = cc; |
| 175 buffer_ = buffer; |
| 176 buffer_size_ = buffer_size; |
| 177 read_starter_ = base::MakeUnique<ReadStarter>(this); |
| 178 } |
| 179 |
| 180 void URLLoaderWrapperImpl::ReadResponseBodyImpl() { |
| 181 read_starter_.reset(); |
| 182 pp::CompletionCallback callback = |
| 183 callback_factory_.NewCallback(&URLLoaderWrapperImpl::DidRead); |
| 184 int rv = url_loader_.ReadResponseBody(buffer_, buffer_size_, callback); |
| 185 if (rv != PP_OK_COMPLETIONPENDING) { |
| 186 callback.Run(rv); |
| 187 } |
| 188 } |
| 189 |
| 190 void URLLoaderWrapperImpl::SetResponseHeaders( |
| 191 const std::string& response_headers) { |
| 192 response_headers_ = response_headers; |
| 193 ParseHeaders(); |
| 194 } |
| 195 |
| 196 void URLLoaderWrapperImpl::ParseHeaders() { |
| 197 content_length_ = -1; |
| 198 accept_ranges_bytes_ = false; |
| 199 content_encoded_ = false; |
| 200 content_type_.clear(); |
| 201 content_disposition_.clear(); |
| 202 multipart_boundary_.clear(); |
| 203 byte_range_ = gfx::Range::InvalidRange(); |
| 204 is_multipart_ = false; |
| 205 |
| 206 if (response_headers_.empty()) |
| 207 return; |
| 208 |
| 209 net::HttpUtil::HeadersIterator it(response_headers_.begin(), |
| 210 response_headers_.end(), "\n"); |
| 211 while (it.GetNext()) { |
| 212 if (base::LowerCaseEqualsASCII(it.name(), "content-length")) { |
| 213 content_length_ = atoi(it.values().c_str()); |
| 214 } else if (base::LowerCaseEqualsASCII(it.name(), "accept-ranges")) { |
| 215 accept_ranges_bytes_ = base::LowerCaseEqualsASCII(it.values(), "bytes"); |
| 216 } else if (base::LowerCaseEqualsASCII(it.name(), "content-encoding")) { |
| 217 content_encoded_ = true; |
| 218 } else if (base::LowerCaseEqualsASCII(it.name(), "content-type")) { |
| 219 content_type_ = it.values(); |
| 220 size_t semi_colon_pos = content_type_.find(';'); |
| 221 if (semi_colon_pos != std::string::npos) { |
| 222 content_type_ = content_type_.substr(0, semi_colon_pos); |
| 223 } |
| 224 base::TrimWhitespaceASCII(content_type_, base::TRIM_ALL, &content_type_); |
| 225 // multipart boundary. |
| 226 std::string type = base::ToLowerASCII(it.values()); |
| 227 if (base::StartsWith(type, "multipart/", base::CompareCase::SENSITIVE)) { |
| 228 const char* boundary = strstr(type.c_str(), "boundary="); |
| 229 DCHECK(boundary); |
| 230 if (boundary) { |
| 231 multipart_boundary_ = std::string(boundary + 9); |
| 232 is_multipart_ = !multipart_boundary_.empty(); |
| 233 } |
| 234 } |
| 235 } else if (base::LowerCaseEqualsASCII(it.name(), "content-disposition")) { |
| 236 content_disposition_ = it.values(); |
| 237 } else if (base::LowerCaseEqualsASCII(it.name(), "content-range")) { |
| 238 int start = 0; |
| 239 int end = 0; |
| 240 if (GetByteRangeFromStr(it.values().c_str(), &start, &end)) { |
| 241 byte_range_ = gfx::Range(start, end); |
| 242 } |
| 243 } |
| 244 } |
| 245 } |
| 246 |
| 247 void URLLoaderWrapperImpl::DidOpen(int32_t result) { |
| 248 SetHeadersFromLoader(); |
| 249 did_open_callback_.Run(result); |
| 250 } |
| 251 |
| 252 void URLLoaderWrapperImpl::DidRead(int32_t result) { |
| 253 if (multi_part_processed_) { |
| 254 // Reset this flag so we look inside the buffer in calls of DidRead for this |
| 255 // response only once. Note that this code DOES NOT handle multi part |
| 256 // responses with more than one part (we don't issue them at the moment, so |
| 257 // they shouldn't arrive). |
| 258 is_multipart_ = false; |
| 259 } |
| 260 if (result <= 0 || !is_multipart_) { |
| 261 did_read_callback_.Run(result); |
| 262 return; |
| 263 } |
| 264 if (result <= 2) { |
| 265 // TODO(art-snake): Accumulate data for parse headers. |
| 266 did_read_callback_.Run(result); |
| 267 return; |
| 268 } |
| 269 |
| 270 char* start = buffer_; |
| 271 size_t length = result; |
| 272 multi_part_processed_ = true; |
| 273 for (int i = 2; i < result; ++i) { |
| 274 if ((buffer_[i - 1] == '\n' && buffer_[i - 2] == '\n') || |
| 275 (i >= 4 && buffer_[i - 1] == '\n' && buffer_[i - 2] == '\r' && |
| 276 buffer_[i - 3] == '\n' && buffer_[i - 4] == '\r')) { |
| 277 int start_pos = 0; |
| 278 int end_pos = 0; |
| 279 if (GetByteRangeFromHeaders(std::string(buffer_, i), &start_pos, |
| 280 &end_pos)) { |
| 281 byte_range_ = gfx::Range(start_pos, end_pos); |
| 282 start += i; |
| 283 length -= i; |
| 284 } |
| 285 break; |
| 286 } |
| 287 } |
| 288 result = length; |
| 289 if (result == 0) { |
| 290 // Continue receiving. |
| 291 return ReadResponseBodyImpl(); |
| 292 } |
| 293 DCHECK(result > 0); |
| 294 memmove(buffer_, start, result); |
| 295 |
| 296 did_read_callback_.Run(result); |
| 297 } |
| 298 |
| 299 void URLLoaderWrapperImpl::SetHeadersFromLoader() { |
| 300 pp::URLResponseInfo response = url_loader_.GetResponseInfo(); |
| 301 pp::Var headers_var = response.GetHeaders(); |
| 302 |
| 303 SetResponseHeaders(headers_var.is_string() ? headers_var.AsString() : ""); |
| 304 } |
| 305 |
| 306 } // namespace chrome_pdf |
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