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Add better escaping

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This commit is contained in:
hiimgoodpack 2021-04-07 20:18:21 -04:00
parent 2a4c54ad53
commit 1c52e0f370
Signed by untrusted user: hiimgoodpack
GPG key ID: 4E0E62733C14AE69
1 changed files with 26 additions and 4 deletions
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30
brainlet.h
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@ -73,7 +73,8 @@ namespace Brainlet {
State state = NOT_CONNECTED;
static void onReceive(Client* client, std::string buffer);
void encode(std::string& string); ///< Encodes a string to a JSON value
void escapeJSON(std::string& string); ///< Escapes a string to a JSON value
void escapeOutput(std::string& string); ///< Escapes a string to output safely
public:
std::function<void(Channel)> onNewChannel = nullptr;
@ -112,7 +113,7 @@ namespace Brainlet {
namespace Brainlet {
Client::Client(const std::string& domain) : domain(domain) {}
void Client::encode(std::string& string) {
void Client::escapeJSON(std::string& string) {
std::string result;
result.reserve(string.size());
@ -131,6 +132,20 @@ namespace Brainlet {
string = std::move(result);
}
void Client::escapeOutput(std::string& string) {
std::string result;
result.reserve(string.size());
std::for_each(string.begin(), string.end(), [&](const char character) {
switch (character) {
case '\b':
case '\x1f': result.push_back('?'); break;
default: result.push_back(character); break;
}
});
string = std::move(result);
}
void Client::processNextEvent() {
socket->run_until(
// Stop in 250 microseconds
@ -172,7 +187,9 @@ namespace Brainlet {
bool didError = value.get("error", true).asBool();
if (didError) {
// TODO: Use exception
std::cerr << "Error while logging in: " << value.get("message", "Server did not specify error").asString() << "\n";
std::string error = value.get("message", "Server did not specify error").asString();
escapeOutput(error);
std::cerr << "Error while logging in: " << error << "\n";
return;
}
@ -210,6 +227,7 @@ namespace Brainlet {
case NOT_CONNECTED: throw std::logic_error("Buffer was received while client is not connected");
case WAIT_HELLO: {
if (opcode != HELLO) {
escapeOutput(buffer);
std::cerr << "Failed authentication: Expected HELLO packet, received: " << buffer << "\n";
client->socket->close();
return;
@ -225,6 +243,7 @@ namespace Brainlet {
}
case WAIT_ACK: {
if (opcode != YOO_ACK) {
escapeOutput(buffer);
std::cerr << "Failed authentication: Expected YOO_ACK packet, received: " << buffer << "\n";
client->socket->close();
return;
@ -243,6 +262,7 @@ namespace Brainlet {
if (client->onNewChannel)
client->onNewChannel(channelObject);
}
break;
}
case READY: {
switch (opcode) {
@ -260,15 +280,17 @@ namespace Brainlet {
break;
}
default: {
escapeOutput(buffer);
std::cerr << "Unknown opcode " << opcode << ". Buffer " << buffer << "\n";
break;
}
}
break;
}
}
}
void Client::sendMessage(std::string message, std::string channelId) {
encode(message);
escapeJSON(message);
std::ostringstream bufferToSend;
bufferToSend << ACTION_CREATE_MESSAGE << "@" << R"({"content":")" << message << R"(","channel":{"_id":")" << channelId << R"("}})";