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, 52 insertions, 0 deletions

diff --git a/BrowserSource/Proxy/HTTPParser.h b/BrowserSource/Proxy/HTTPParser.h
new file mode 100644
index 0000000..e97f896
--- /dev/null
+++ b/BrowserSource/Proxy/HTTPParser.h
@@ -0,0 +1,52 @@
+#pragma once
+
+#include <string>
+#include <string_view>
+#include <map>
+
+namespace WebServer {
+
+	// A simple HTTP/1.1 message parser based on RFC 2616.
+	class HTTPParser
+	{
+	public:
+		HTTPParser();
+
+		bool Parse(const std::string& raw_http, std::string& err);
+
+		const std::string& GetMethod() const;
+		const std::string& GetPath() const;
+		bool GetHeader(const std::string& header, std::string& value) const;
+		const std::map<std::string, std::string>& GetHeaders() const;
+		const std::string& GetPayload() const;
+
+	private:
+		enum ParserState {
+			PARSER_STATE_START_LINE,
+			PARSER_STATE_HEADERS,
+			PARSER_STATE_PAYLOAD,
+		};
+
+		bool ParseSegment(
+			const std::string_view segment,
+			ParserState& state,
+			std::string& err);
+		bool ParseStartLine(
+			const std::string_view segment,
+			ParserState& state,
+			std::string& err);
+		bool ParseHeaders(
+			const std::string_view segment,
+			ParserState& state,
+			std::string& err);
+		bool ParsePayload(
+			const std::string_view segment,
+			ParserState& state,
+			std::string& err);
+
+		std::string method_;
+		std::string path_;
+		std::map<std::string, std::string> headers_;
+		std::string payload_;
+	};
+}