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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "http_request.h"
#include <algorithm>
#include <vector>
namespace vespalib::portal {
namespace {
void strip_cr(vespalib::string &str) {
if (!str.empty() && str[str.size() - 1] == '\r') {
str.resize(str.size() - 1);
}
}
std::vector<vespalib::string> split(vespalib::stringref str, char sep) {
vespalib::string token;
std::vector<vespalib::string> list;
for (char c: str) {
if (c != sep) {
token.push_back(c);
} else if (!token.empty()) {
list.push_back(token);
token.clear();
}
}
if (!token.empty()) {
list.push_back(token);
}
return list;
}
int decode_hex_digit(char c) {
if ((c >= '0') && (c <= '9')) {
return (c - '0');
}
if ((c >= 'a') && (c <= 'f')) {
return ((c - 'a') + 10);
}
if ((c >= 'A') && (c <= 'F')) {
return ((c - 'A') + 10);
}
return -1;
}
int decode_hex_num(vespalib::stringref src, size_t idx) {
if (src.size() < (idx + 2)) {
return -1;
}
int a = decode_hex_digit(src[idx]);
int b = decode_hex_digit(src[idx + 1]);
if ((a < 0) || (b < 0)) {
return -1;
}
return ((a << 4) | b);
}
vespalib::string dequote(vespalib::stringref src) {
vespalib::string dst;
for (size_t idx = 0; idx < src.size(); ++idx) {
char c = src[idx];
if (c == '+') {
c = ' ';
} else if (c == '%') {
int x = decode_hex_num(src, idx + 1);
if (x >= 0) {
c = x;
idx += 2;
}
}
dst.push_back(c);
}
return dst;
}
} // namespace vespalib::portal::<unnamed>
void
HttpRequest::set_done()
{
_done = true;
}
void
HttpRequest::set_error()
{
_error = true;
}
void
HttpRequest::handle_request_line(const vespalib::string &line)
{
auto parts = split(line, ' ');
if (parts.size() != 3) {
return set_error(); // malformed request line
}
_method = parts[0];
_uri = parts[1];
_version = parts[2];
size_t query_sep = _uri.find("?");
if (query_sep == vespalib::string::npos) {
_path = dequote(_uri);
} else {
_path = dequote(_uri.substr(0, query_sep));
auto query = split(_uri.substr(query_sep + 1), '&');
for (const auto ¶m: query) {
size_t value_sep = param.find("=");
if (value_sep == vespalib::string::npos) {
_params[dequote(param)] = "";
} else {
auto key = param.substr(0, value_sep);
auto value = param.substr(value_sep + 1);
_params[dequote(key)] = dequote(value);
}
}
}
}
void
HttpRequest::handle_header_line(const vespalib::string &line)
{
if (line.empty()) {
return set_done();
}
size_t pos = 0;
size_t end = line.size();
bool continuation = (line[0] == ' ') || (line[0] == '\t');
if (!continuation) {
pos = line.find(":");
if (pos == vespalib::string::npos) {
return set_error(); // missing header: value separator
} else {
_header_name.assign(line, 0, pos++);
std::transform(_header_name.begin(), _header_name.end(),
_header_name.begin(), ::tolower);
}
}
if (_header_name.empty()) {
return set_error(); // missing header name
}
while ((pos < end) && (isspace(line[pos]))) {
++pos; // strip leading whitespace
}
while ((pos < end) && (isspace(line[end - 1]))) {
--end; // strip trailing whitespace
}
auto header_insert_result = _headers.insert(std::make_pair(_header_name, vespalib::string()));
bool header_found = !header_insert_result.second;
vespalib::string &header_value = header_insert_result.first->second;
if (header_found) {
if (continuation) {
header_value.push_back(' ');
} else { // duplicate header
header_value.push_back(',');
}
}
header_value.append(line.data() + pos, end - pos);
}
void
HttpRequest::handle_line(const vespalib::string &line)
{
if (_first) {
handle_request_line(line);
_first = false;
} else {
handle_header_line(line);
}
}
HttpRequest::HttpRequest()
: _method(),
_uri(),
_version(),
_headers(),
_host(),
_empty(),
_first(true),
_done(false),
_error(false),
_header_name(),
_line_buffer()
{
}
HttpRequest::~HttpRequest() = default;
size_t
HttpRequest::handle_data(const char *buf, size_t len)
{
size_t used = 0;
while (need_more_data() && (used < len)) {
char c = buf[used++];
if (c != '\n') {
_line_buffer.push_back(c);
} else {
strip_cr(_line_buffer);
handle_line(_line_buffer);
_line_buffer.clear();
}
}
return used;
}
void
HttpRequest::resolve_host(const vespalib::string &my_host)
{
_host = get_header("host");
if (_host.empty()) {
_host = my_host;
}
}
const vespalib::string &
HttpRequest::get_header(const vespalib::string &name) const
{
auto pos = _headers.find(name);
if (pos == _headers.end()) {
return _empty;
}
return pos->second;
}
bool
HttpRequest::has_param(const vespalib::string &name) const
{
return (_params.find(name) != _params.end());
}
const vespalib::string &
HttpRequest::get_param(const vespalib::string &name) const
{
auto pos = _params.find(name);
if (pos == _params.end()) {
return _empty;
}
return pos->second;
}
} // namespace vespalib::portal
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