| // 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 "pdf/url_loader_wrapper_impl.h" |
| |
| #include <memory> |
| |
| #include "base/bind.h" |
| #include "base/check_op.h" |
| #include "base/strings/string_util.h" |
| #include "base/strings/stringprintf.h" |
| #include "net/http/http_util.h" |
| #include "ppapi/c/pp_errors.h" |
| #include "ppapi/cpp/logging.h" |
| #include "ppapi/cpp/url_request_info.h" |
| #include "ppapi/cpp/url_response_info.h" |
| |
| namespace chrome_pdf { |
| |
| namespace { |
| |
| // We should read with delay to prevent block UI thread, and reduce CPU usage. |
| constexpr base::TimeDelta kReadDelayMs = base::TimeDelta::FromMilliseconds(2); |
| |
| pp::URLRequestInfo MakeRangeRequest(pp::Instance* plugin_instance, |
| const std::string& url, |
| const std::string& referrer_url, |
| uint32_t position, |
| uint32_t size) { |
| pp::URLRequestInfo request(plugin_instance); |
| request.SetURL(url); |
| request.SetMethod("GET"); |
| request.SetFollowRedirects(false); |
| request.SetCustomReferrerURL(referrer_url); |
| |
| // According to rfc2616, byte range specifies position of the first and last |
| // bytes in the requested range inclusively. Therefore we should subtract 1 |
| // from the position + size, to get index of the last byte that needs to be |
| // downloaded. |
| std::string str_header = |
| base::StringPrintf("Range: bytes=%d-%d", position, position + size - 1); |
| pp::Var header(str_header.c_str()); |
| request.SetHeaders(header); |
| |
| return request; |
| } |
| |
| bool GetByteRangeFromStr(const std::string& content_range_str, |
| int* start, |
| int* end) { |
| std::string range = content_range_str; |
| if (!base::StartsWith(range, "bytes", base::CompareCase::INSENSITIVE_ASCII)) |
| return false; |
| |
| range = range.substr(strlen("bytes")); |
| std::string::size_type pos = range.find('-'); |
| std::string range_end; |
| if (pos != std::string::npos) |
| range_end = range.substr(pos + 1); |
| base::TrimWhitespaceASCII(range, base::TRIM_LEADING, &range); |
| base::TrimWhitespaceASCII(range_end, base::TRIM_LEADING, &range_end); |
| *start = atoi(range.c_str()); |
| *end = atoi(range_end.c_str()); |
| return true; |
| } |
| |
| // If the headers have a byte-range response, writes the start and end |
| // positions and returns true if at least the start position was parsed. |
| // The end position will be set to 0 if it was not found or parsed from the |
| // response. |
| // Returns false if not even a start position could be parsed. |
| bool GetByteRangeFromHeaders(const std::string& headers, int* start, int* end) { |
| net::HttpUtil::HeadersIterator it(headers.begin(), headers.end(), "\n"); |
| while (it.GetNext()) { |
| if (base::LowerCaseEqualsASCII(it.name_piece(), "content-range")) { |
| if (GetByteRangeFromStr(it.values().c_str(), start, end)) |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| bool IsDoubleEndLineAtEnd(const char* buffer, int size) { |
| if (size < 2) |
| return false; |
| |
| if (buffer[size - 1] == '\n' && buffer[size - 2] == '\n') |
| return true; |
| |
| if (size < 4) |
| return false; |
| |
| return buffer[size - 1] == '\n' && buffer[size - 2] == '\r' && |
| buffer[size - 3] == '\n' && buffer[size - 4] == '\r'; |
| } |
| |
| } // namespace |
| |
| URLLoaderWrapperImpl::URLLoaderWrapperImpl(pp::Instance* plugin_instance, |
| const pp::URLLoader& url_loader) |
| : plugin_instance_(plugin_instance), |
| url_loader_(url_loader), |
| callback_factory_(this) { |
| SetHeadersFromLoader(); |
| } |
| |
| URLLoaderWrapperImpl::~URLLoaderWrapperImpl() { |
| Close(); |
| // We should call callbacks to prevent memory leaks. |
| // The callbacks don't do anything, because the objects that created the |
| // callbacks have been destroyed. |
| if (!did_open_callback_.IsOptional()) |
| did_open_callback_.RunAndClear(-1); |
| if (!did_read_callback_.IsOptional()) |
| did_read_callback_.RunAndClear(-1); |
| } |
| |
| int URLLoaderWrapperImpl::GetContentLength() const { |
| return content_length_; |
| } |
| |
| bool URLLoaderWrapperImpl::IsAcceptRangesBytes() const { |
| return accept_ranges_bytes_; |
| } |
| |
| bool URLLoaderWrapperImpl::IsContentEncoded() const { |
| return content_encoded_; |
| } |
| |
| std::string URLLoaderWrapperImpl::GetContentType() const { |
| return content_type_; |
| } |
| std::string URLLoaderWrapperImpl::GetContentDisposition() const { |
| return content_disposition_; |
| } |
| |
| int URLLoaderWrapperImpl::GetStatusCode() const { |
| return url_loader_.GetResponseInfo().GetStatusCode(); |
| } |
| |
| bool URLLoaderWrapperImpl::IsMultipart() const { |
| return is_multipart_; |
| } |
| |
| bool URLLoaderWrapperImpl::GetByteRangeStart(int* start) const { |
| DCHECK(start); |
| *start = byte_range_.start(); |
| return byte_range_.IsValid(); |
| } |
| |
| bool URLLoaderWrapperImpl::GetDownloadProgress( |
| int64_t* bytes_received, |
| int64_t* total_bytes_to_be_received) const { |
| return url_loader_.GetDownloadProgress(bytes_received, |
| total_bytes_to_be_received); |
| } |
| |
| void URLLoaderWrapperImpl::Close() { |
| url_loader_.Close(); |
| read_starter_.Stop(); |
| } |
| |
| void URLLoaderWrapperImpl::OpenRange(const std::string& url, |
| const std::string& referrer_url, |
| uint32_t position, |
| uint32_t size, |
| const pp::CompletionCallback& cc) { |
| did_open_callback_ = cc; |
| pp::CompletionCallback callback = |
| callback_factory_.NewCallback(&URLLoaderWrapperImpl::DidOpen); |
| int rv = url_loader_.Open( |
| MakeRangeRequest(plugin_instance_, url, referrer_url, position, size), |
| callback); |
| if (rv != PP_OK_COMPLETIONPENDING) |
| callback.Run(rv); |
| } |
| |
| void URLLoaderWrapperImpl::ReadResponseBody(char* buffer, |
| int buffer_size, |
| const pp::CompletionCallback& cc) { |
| did_read_callback_ = cc; |
| buffer_ = buffer; |
| buffer_size_ = buffer_size; |
| read_starter_.Start( |
| FROM_HERE, kReadDelayMs, |
| base::BindOnce(&URLLoaderWrapperImpl::ReadResponseBodyImpl, |
| base::Unretained(this))); |
| } |
| |
| void URLLoaderWrapperImpl::ReadResponseBodyImpl() { |
| pp::CompletionCallback callback = |
| callback_factory_.NewCallback(&URLLoaderWrapperImpl::DidRead); |
| int rv = url_loader_.ReadResponseBody(buffer_, buffer_size_, callback); |
| if (rv != PP_OK_COMPLETIONPENDING) { |
| callback.Run(rv); |
| } |
| } |
| |
| void URLLoaderWrapperImpl::SetResponseHeaders( |
| const std::string& response_headers) { |
| response_headers_ = response_headers; |
| ParseHeaders(); |
| } |
| |
| void URLLoaderWrapperImpl::ParseHeaders() { |
| content_length_ = -1; |
| accept_ranges_bytes_ = false; |
| content_encoded_ = false; |
| content_type_.clear(); |
| content_disposition_.clear(); |
| multipart_boundary_.clear(); |
| byte_range_ = gfx::Range::InvalidRange(); |
| is_multipart_ = false; |
| |
| if (response_headers_.empty()) |
| return; |
| |
| net::HttpUtil::HeadersIterator it(response_headers_.begin(), |
| response_headers_.end(), "\n"); |
| while (it.GetNext()) { |
| base::StringPiece name = it.name_piece(); |
| if (base::LowerCaseEqualsASCII(name, "content-length")) { |
| content_length_ = atoi(it.values().c_str()); |
| } else if (base::LowerCaseEqualsASCII(name, "accept-ranges")) { |
| accept_ranges_bytes_ = base::LowerCaseEqualsASCII(it.values(), "bytes"); |
| } else if (base::LowerCaseEqualsASCII(name, "content-encoding")) { |
| content_encoded_ = true; |
| } else if (base::LowerCaseEqualsASCII(name, "content-type")) { |
| content_type_ = it.values(); |
| size_t semi_colon_pos = content_type_.find(';'); |
| if (semi_colon_pos != std::string::npos) { |
| content_type_ = content_type_.substr(0, semi_colon_pos); |
| } |
| base::TrimWhitespaceASCII(content_type_, base::TRIM_ALL, &content_type_); |
| // multipart boundary. |
| std::string type = base::ToLowerASCII(it.values_piece()); |
| if (base::StartsWith(type, "multipart/", base::CompareCase::SENSITIVE)) { |
| const char* boundary = strstr(type.c_str(), "boundary="); |
| DCHECK(boundary); |
| if (boundary) { |
| multipart_boundary_ = std::string(boundary + 9); |
| is_multipart_ = !multipart_boundary_.empty(); |
| } |
| } |
| } else if (base::LowerCaseEqualsASCII(name, "content-disposition")) { |
| content_disposition_ = it.values(); |
| } else if (base::LowerCaseEqualsASCII(name, "content-range")) { |
| int start = 0; |
| int end = 0; |
| if (GetByteRangeFromStr(it.values().c_str(), &start, &end)) { |
| byte_range_ = gfx::Range(start, end); |
| } |
| } |
| } |
| } |
| |
| void URLLoaderWrapperImpl::DidOpen(int32_t result) { |
| SetHeadersFromLoader(); |
| did_open_callback_.RunAndClear(result); |
| } |
| |
| void URLLoaderWrapperImpl::DidRead(int32_t result) { |
| if (multi_part_processed_) { |
| // Reset this flag so we look inside the buffer in calls of DidRead for this |
| // response only once. Note that this code DOES NOT handle multi part |
| // responses with more than one part (we don't issue them at the moment, so |
| // they shouldn't arrive). |
| is_multipart_ = false; |
| } |
| if (result <= 0 || !is_multipart_) { |
| did_read_callback_.RunAndClear(result); |
| return; |
| } |
| if (result <= 2) { |
| // TODO(art-snake): Accumulate data for parse headers. |
| did_read_callback_.RunAndClear(result); |
| return; |
| } |
| |
| char* start = buffer_; |
| size_t length = result; |
| multi_part_processed_ = true; |
| for (int i = 2; i < result; ++i) { |
| if (IsDoubleEndLineAtEnd(buffer_, i)) { |
| int start_pos = 0; |
| int end_pos = 0; |
| if (GetByteRangeFromHeaders(std::string(buffer_, i), &start_pos, |
| &end_pos)) { |
| byte_range_ = gfx::Range(start_pos, end_pos); |
| start += i; |
| length -= i; |
| } |
| break; |
| } |
| } |
| result = length; |
| if (result == 0) { |
| // Continue receiving. |
| return ReadResponseBodyImpl(); |
| } |
| DCHECK_GT(result, 0); |
| memmove(buffer_, start, result); |
| |
| did_read_callback_.RunAndClear(result); |
| } |
| |
| void URLLoaderWrapperImpl::SetHeadersFromLoader() { |
| pp::URLResponseInfo response = url_loader_.GetResponseInfo(); |
| pp::Var headers_var = response.GetHeaders(); |
| |
| SetResponseHeaders(headers_var.is_string() ? headers_var.AsString() : ""); |
| } |
| |
| } // namespace chrome_pdf |