Begin work on proxy server

Create a simple server with 3 endpoints:
* /create_session: Create a session and return its identifier.
* /set_transcript: Update a session's transcript.
* /get_transcript: Fetch a session's transcript.

Right now the session ID provides authentication *and* authorization.
There is no public/private ID so you have to trust whoever you share
your ID with.

IDs are long and generated by the server, so it should be somewhat
secure against low-effort hacking.

Other updates:
* Drop whisper_requirements.txt - no longer needed.
* Vendor curl to make it easier to interact with the server.

TODO:
* Fuzz test the server.

1 files changed, 69 insertions, 0 deletions

diff --git a/BrowserSource/Proxy/HTTPMapper.cpp b/BrowserSource/Proxy/HTTPMapper.cpp
new file mode 100644
index 0000000..af4f6d0
--- /dev/null
+++ b/BrowserSource/Proxy/HTTPMapper.cpp
@@ -0,0 +1,69 @@
+#include "HTTPMapper.h"
+
+#include <sstream>
+#include <map>
+
+namespace {
+	// Source: RFC 2616 section 6.1.1
+	const std::map<int, std::string> kStatusCodeToString{
+		{100, "Continue" },
+		{101, "Switching Protocols"},
+		{200, "OK"},
+		{201, "Created"},
+		{202, "Accepted"},
+		{203, "Non-Authoritative Information"},
+		{204, "No Content"},
+		{205, "Reset Content"},
+		{206, "Partial Content"},
+		{300, "Multiple Choices"},
+		{301, "Moved Permanently"},
+		{302, "Found"},
+		{303, "See Other"},
+		{304, "Not Modified"},
+		{305, "Use Proxy"},
+		{307, "Temporary Redirect"},
+		{400, "Bad Request"},
+		{401, "Unauthorized"},
+		{402, "Payment Required"},
+		{403, "Forbidden"},
+		{404, "Not Found"},
+		{405, "Method Not Allowed"},
+		{406, "Not Acceptable"},
+	};
+}
+
+namespace WebServer {
+	std::string HTTPMapper::Map(const int status_code,
+		const std::string& payload, const ContentType type) {
+		switch (type) {
+		case HTML:
+			return HTTPMapperHTML().Map(status_code, payload);
+		case JSON:
+			return HTTPMapperJSON().Map(status_code, payload);
+		}
+	}
+
+	std::string HTTPMapperHTML::Map(const int status_code,
+		const std::string& payload) {
+		std::ostringstream oss;
+		// This might throw and crash the app, but that's ok, just don't use an unsupported code.
+		oss << "HTTP/1.1 " << status_code << " " << kStatusCodeToString.at(status_code) << "\r\n";
+		oss << "Content-Type: text/html\r\n";
+		oss << "Content-Length: " << std::to_string(payload.size()) << "\r\n";
+		oss << "\r\n";
+		oss << payload;
+		return oss.str();
+	}
+
+	std::string HTTPMapperJSON::Map(const int status_code,
+		const std::string& payload) {
+		std::ostringstream oss;
+		// This might throw and crash the app, but that's ok, just don't use an unsupported code.
+		oss << "HTTP/1.1 " << status_code << " " << kStatusCodeToString.at(status_code) << "\r\n";
+		oss << "Content-Type: application/json\r\n";
+		oss << "Content-Length: " << std::to_string(payload.size()) << "\r\n";
+		oss << "\r\n";
+		oss << payload;
+		return oss.str();
+	}
+}
\ No newline at end of file