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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Base64.h>
#include <AK/StringBuilder.h>
#include <LibHTTP/HttpJob.h>
#include <LibHTTP/HttpRequest.h>
namespace HTTP {
HttpRequest::HttpRequest()
{
}
HttpRequest::~HttpRequest()
{
}
String HttpRequest::method_name() const
{
switch (m_method) {
case Method::GET:
return "GET";
case Method::HEAD:
return "HEAD";
case Method::POST:
return "POST";
default:
VERIFY_NOT_REACHED();
}
}
ByteBuffer HttpRequest::to_raw_request() const
{
StringBuilder builder;
builder.append(method_name());
builder.append(' ');
// NOTE: The percent_encode is so that e.g. spaces are properly encoded.
auto path = m_url.path();
VERIFY(!path.is_empty());
builder.append(URL::percent_encode(m_url.path(), URL::PercentEncodeSet::EncodeURI));
if (!m_url.query().is_empty()) {
builder.append('?');
builder.append(URL::percent_encode(m_url.query(), URL::PercentEncodeSet::EncodeURI));
}
builder.append(" HTTP/1.1\r\nHost: ");
builder.append(m_url.host());
builder.append("\r\n");
for (auto& header : m_headers) {
builder.append(header.name);
builder.append(": ");
builder.append(header.value);
builder.append("\r\n");
}
builder.append("Connection: close\r\n");
if (!m_body.is_empty()) {
builder.appendff("Content-Length: {}\r\n\r\n", m_body.size());
builder.append((char const*)m_body.data(), m_body.size());
}
builder.append("\r\n");
return builder.to_byte_buffer();
}
Optional<HttpRequest> HttpRequest::from_raw_request(ReadonlyBytes raw_request)
{
enum class State {
InMethod,
InResource,
InProtocol,
InHeaderName,
InHeaderValue,
};
State state { State::InMethod };
size_t index = 0;
auto peek = [&](int offset = 0) -> u8 {
if (index + offset >= raw_request.size())
return 0;
return raw_request[index + offset];
};
auto consume = [&]() -> u8 {
VERIFY(index < raw_request.size());
return raw_request[index++];
};
Vector<u8, 256> buffer;
String method;
String resource;
String protocol;
Vector<Header> headers;
Header current_header;
auto commit_and_advance_to = [&](auto& output, State new_state) {
output = String::copy(buffer);
buffer.clear();
state = new_state;
};
while (index < raw_request.size()) {
// FIXME: Figure out what the appropriate limitations should be.
if (buffer.size() > 65536)
return {};
switch (state) {
case State::InMethod:
if (peek() == ' ') {
consume();
commit_and_advance_to(method, State::InResource);
break;
}
buffer.append(consume());
break;
case State::InResource:
if (peek() == ' ') {
consume();
commit_and_advance_to(resource, State::InProtocol);
break;
}
buffer.append(consume());
break;
case State::InProtocol:
if (peek(0) == '\r' && peek(1) == '\n') {
consume();
consume();
commit_and_advance_to(protocol, State::InHeaderName);
break;
}
buffer.append(consume());
break;
case State::InHeaderName:
if (peek(0) == ':' && peek(1) == ' ') {
consume();
consume();
commit_and_advance_to(current_header.name, State::InHeaderValue);
break;
}
buffer.append(consume());
break;
case State::InHeaderValue:
if (peek(0) == '\r' && peek(1) == '\n') {
consume();
consume();
commit_and_advance_to(current_header.value, State::InHeaderName);
headers.append(move(current_header));
break;
}
buffer.append(consume());
break;
}
}
HttpRequest request;
if (method == "GET")
request.m_method = Method::GET;
else if (method == "HEAD")
request.m_method = Method::HEAD;
else if (method == "POST")
request.m_method = Method::POST;
else
return {};
request.m_resource = URL::percent_decode(resource);
request.m_headers = move(headers);
return request;
}
void HttpRequest::set_headers(HashMap<String, String> const& headers)
{
for (auto& it : headers)
m_headers.append({ it.key, it.value });
}
Optional<HttpRequest::Header> HttpRequest::get_http_basic_authentication_header(URL const& url)
{
if (!url.includes_credentials())
return {};
StringBuilder builder;
builder.append(url.username());
builder.append(':');
builder.append(url.password());
auto token = encode_base64(builder.to_string().bytes());
builder.clear();
builder.append("Basic ");
builder.append(token);
return Header { "Authorization", builder.to_string() };
}
Optional<HttpRequest::BasicAuthenticationCredentials> HttpRequest::parse_http_basic_authentication_header(String const& value)
{
if (!value.starts_with("Basic ", AK::CaseSensitivity::CaseInsensitive))
return {};
auto token = value.substring_view(6);
if (token.is_empty())
return {};
auto decoded_token = String::copy(decode_base64(token));
auto colon_index = decoded_token.find(':');
if (!colon_index.has_value())
return {};
auto username = decoded_token.substring_view(0, colon_index.value());
auto password = decoded_token.substring_view(colon_index.value() + 1);
return BasicAuthenticationCredentials { username, password };
}
}
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