Implement HTTP requests for Squirrel scripts (#344)

* Native HttpRequestHandler to make HTTP requests from Squirrel

* Init handler & register SQ funcs

# Conflicts:
#	NorthstarDLL/NorthstarDLL.vcxproj
#	NorthstarDLL/NorthstarDLL.vcxproj.filters

* Allow redirects, fix crashing with buffer.

* Also read response header

* Remove leftover header debug stuffs

* Prevent private network requests unless -allowlocalhttp is in the command line.

* Minor tweak

* Support all HTTP methods, private network check changes.

* Add OPTIONS, timeout & user-agent overrides.

* Add -disablehttprequests, final tweaks.

* Fix one of the private ipv4 ranges

* Native HttpRequestHandler to make HTTP requests from Squirrel

* Init handler & register SQ funcs

# Conflicts:
#	NorthstarDLL/NorthstarDLL.vcxproj
#	NorthstarDLL/NorthstarDLL.vcxproj.filters

* Allow redirects, fix crashing with buffer.

* Also read response header

* Remove leftover header debug stuffs

* Prevent private network requests unless -allowlocalhttp is in the command line.

* Minor tweak

* Support all HTTP methods, private network check changes.

* Add OPTIONS, timeout & user-agent overrides.

* Add -disablehttprequests, final tweaks.

* Fix one of the private ipv4 ranges

* Update to latest and fix issues mentionned in previous PR

* Cleanup some return statements

* Also cache IsLocalHttpAllowed(), query param array work

* Cache command line args in ctor, more header/query array work

* Support for multiple values with same key in headers & query params

* Format check made this look disgusting, don't blame me.

* More format fixes

* Tweakerino

* Tell clang-format to segfault itself

* Add -disablehttpssl to ignore SSL verifications

* Fix headers being written to body with custom headers

* Remove useless comments

1 files changed, 132 insertions, 0 deletions

diff --git a/NorthstarDLL/httprequesthandler.h b/NorthstarDLL/httprequesthandler.h
new file mode 100644
index 00000000..0f888b6e
--- /dev/null
+++ b/NorthstarDLL/httprequesthandler.h
@@ -0,0 +1,132 @@
+#pragma once
+
+#include "pch.h"
+
+enum class ScriptContext;
+
+// These definitions below should match on the Squirrel side so we can easily pass them along through a function.
+
+/**
+ * Allowed methods for an HttpRequest.
+ */
+namespace HttpRequestMethod
+{
+	enum Type
+	{
+		HRM_GET = 0,
+		HRM_POST = 1,
+		HRM_HEAD = 2,
+		HRM_PUT = 3,
+		HRM_DELETE = 4,
+		HRM_PATCH = 5,
+		HRM_OPTIONS = 6,
+	};
+
+	/** Returns the HTTP string representation of the given method. */
+	inline std::string ToString(HttpRequestMethod::Type method)
+	{
+		switch (method)
+		{
+		case HttpRequestMethod::HRM_GET:
+			return "GET";
+		case HttpRequestMethod::HRM_POST:
+			return "POST";
+		case HttpRequestMethod::HRM_HEAD:
+			return "HEAD";
+		case HttpRequestMethod::HRM_PUT:
+			return "PUT";
+		case HttpRequestMethod::HRM_DELETE:
+			return "DELETE";
+		case HttpRequestMethod::HRM_PATCH:
+			return "PATCH";
+		case HttpRequestMethod::HRM_OPTIONS:
+			return "OPTIONS";
+		default:
+			return "INVALID";
+		}
+	}
+
+	/** Whether or not the given method should be treated like a POST for curlopts. */
+	bool UsesCurlPostOptions(HttpRequestMethod::Type method)
+	{
+		switch (method)
+		{
+		case HttpRequestMethod::HRM_POST:
+		case HttpRequestMethod::HRM_PUT:
+		case HttpRequestMethod::HRM_DELETE:
+		case HttpRequestMethod::HRM_PATCH:
+			return true;
+		default:
+			return false;
+		}
+	}
+
+	/** Whether or not the given http request method can have query parameters in the URL. */
+	bool CanHaveQueryParameters(HttpRequestMethod::Type method)
+	{
+		return method == HttpRequestMethod::HRM_GET || UsesCurlPostOptions(method);
+	}
+}; // namespace HttpRequestMethod
+
+/** Contains data about an http request that has been queued. */
+struct HttpRequest
+{
+	/** Method used for this http request. */
+	HttpRequestMethod::Type method;
+
+	/** Base URL of this http request. */
+	std::string baseUrl;
+
+	/** Headers used for this http request. Some may get overridden or ignored. */
+	std::unordered_map<std::string, std::vector<std::string>> headers;
+
+	/** Query parameters for this http request. */
+	std::unordered_map<std::string, std::vector<std::string>> queryParameters;
+
+	/** The content type of this http request. Defaults to text/plain & UTF-8 charset. */
+	std::string contentType = "text/plain; charset=utf-8";
+
+	/** The body of this http request. If set, will override queryParameters.*/
+	std::string body;
+
+	/** The timeout for the http request, in seconds. Must be between 1 and 60. */
+	int timeout;
+
+	/** If set, the override to use for the User-Agent header. */
+	std::string userAgent;
+};
+
+/**
+ * Handles making HTTP requests and sending the responses back to Squirrel.
+ */
+class HttpRequestHandler
+{
+  public:
+	HttpRequestHandler();
+
+	// Start/Stop the HTTP request handler. Right now this doesn't do much.
+	void StartHttpRequestHandler();
+	void StopHttpRequestHandler();
+
+	// Whether or not this http request handler is currently running.
+	bool IsRunning() const
+	{
+		return m_bIsHttpRequestHandlerRunning;
+	}
+
+	/**
+	 * Creates a new thread to execute an HTTP request.
+	 * @param requestParameters The parameters to use for this http request.
+	 * @returns The handle for the http request being sent, or -1 if the request failed.
+	 */
+	template <ScriptContext context> int MakeHttpRequest(const HttpRequest& requestParameters);
+
+	/** Registers the HTTP request Squirrel functions for the given script context. */
+	template <ScriptContext context> void RegisterSQFuncs();
+
+  private:
+	int m_iLastRequestHandle = 0;
+	std::atomic_bool m_bIsHttpRequestHandlerRunning = false;
+};
+
+extern HttpRequestHandler* g_httpRequestHandler;