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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/modules/eventsource/event_source_parser.h"
#include "third_party/blink/renderer/core/event_type_names.h"
#include "third_party/blink/renderer/modules/eventsource/event_source.h"
#include "third_party/blink/renderer/platform/wtf/std_lib_extras.h"
#include "third_party/blink/renderer/platform/wtf/text/ascii_ctype.h"
#include "third_party/blink/renderer/platform/wtf/text/text_encoding.h"
#include "third_party/blink/renderer/platform/wtf/text/text_encoding_registry.h"
#include "third_party/blink/renderer/platform/wtf/wtf_size_t.h"
namespace blink {
EventSourceParser::EventSourceParser(const AtomicString& last_event_id,
Client* client)
: id_(last_event_id),
last_event_id_(last_event_id),
client_(client),
codec_(NewTextCodec(UTF8Encoding())) {}
void EventSourceParser::AddBytes(base::span<const char> bytes) {
// A line consists of |m_line| followed by
// |bytes[start..(next line break)]|.
size_t start = 0;
const unsigned char kBOM[] = {0xef, 0xbb, 0xbf};
for (size_t i = 0; i < bytes.size() && !is_stopped_; ++i) {
// As kBOM contains neither CR nor LF, we can think BOM and the line
// break separately.
if (is_recognizing_bom_ && line_.size() + (i - start) == std::size(kBOM)) {
Vector<char> line = line_;
line.AppendSpan(bytes.subspan(start, i - start));
DCHECK_EQ(line.size(), std::size(kBOM));
is_recognizing_bom_ = false;
if (base::as_byte_span(line) == base::span(kBOM)) {
start = i;
line_.clear();
continue;
}
}
if (is_recognizing_crlf_ && bytes[i] == '\n') {
// This is the latter part of "\r\n".
is_recognizing_crlf_ = false;
++start;
continue;
}
is_recognizing_crlf_ = false;
if (bytes[i] == '\r' || bytes[i] == '\n') {
line_.AppendSpan(bytes.subspan(start, i - start));
ParseLine();
line_.clear();
start = i + 1;
is_recognizing_crlf_ = bytes[i] == '\r';
is_recognizing_bom_ = false;
}
}
if (is_stopped_)
return;
line_.AppendSpan(bytes.subspan(start));
}
void EventSourceParser::ParseLine() {
if (line_.size() == 0) {
last_event_id_ = id_;
// We dispatch an event when seeing an empty line.
if (!data_.empty()) {
DCHECK_EQ(data_[data_.size() - 1], '\n');
String data = FromUTF8(base::span(data_).first(data_.size() - 1u));
client_->OnMessageEvent(
event_type_.empty() ? event_type_names::kMessage : event_type_, data,
last_event_id_);
data_.clear();
}
event_type_ = g_null_atom;
return;
}
wtf_size_t field_name_end = line_.Find(':');
wtf_size_t field_value_start;
if (field_name_end == WTF::kNotFound) {
field_name_end = line_.size();
field_value_start = field_name_end;
} else {
field_value_start = field_name_end + 1;
if (field_value_start < line_.size() && line_[field_value_start] == ' ') {
++field_value_start;
}
}
String field_name = FromUTF8(base::span(line_).first(field_name_end));
auto field_value = base::span(line_).subspan(field_value_start);
if (field_name == "event") {
event_type_ = AtomicString(FromUTF8(field_value));
return;
}
if (field_name == "data") {
data_.AppendSpan(field_value);
data_.push_back('\n');
return;
}
if (field_name == "id") {
if (std::ranges::find(field_value, '\0') == field_value.end()) {
id_ = AtomicString(FromUTF8(field_value));
}
return;
}
if (field_name == "retry") {
const bool has_only_digits =
std::ranges::all_of(field_value, IsASCIIDigit<char>);
if (field_value.empty()) {
client_->OnReconnectionTimeSet(EventSource::kDefaultReconnectDelay);
} else if (has_only_digits) {
bool ok;
auto reconnection_time = FromUTF8(field_value).ToUInt64Strict(&ok);
if (ok)
client_->OnReconnectionTimeSet(reconnection_time);
}
return;
}
// Unrecognized field name. Ignore!
}
String EventSourceParser::FromUTF8(base::span<const char> chars) {
return codec_->Decode(base::as_bytes(chars), WTF::FlushBehavior::kDataEOF);
}
void EventSourceParser::Trace(Visitor* visitor) const {
visitor->Trace(client_);
}
} // namespace blink
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