feat: sar_download_file

This could potentially be unsafe, but it could also automate srconfigs updates, challenge_maplist, fast taunts, containerridesave, vaultsave, tram save, etc. Just be careful with usage, it overwrites!

Smartly reads through game directories for existing file to overwrite (even p2common), falls back to main game directory i.e. portal2 / portalreloaded / whatever if file doesn't exist.

Author: ThisAMJ

src/Features/ConfigPlus.cpp

@@ -2,6 +2,7 @@
 #include "Features/Session.hpp"
 #include "Modules/Client.hpp"
 #include "Modules/Engine.hpp"
+#include "Modules/FileSystem.hpp"
 
 #include <cstdlib>
 #include <cstring>
@@ -11,6 +12,8 @@
 #include <vector>
 #include <unordered_set>
 #include <fstream>
+#include <curl/curl.h>
+#include <regex>
 
 // Fuck you Windows
 #ifdef _WIN32
@@ -52,6 +55,62 @@ static void SavePersistentSvars() {
 	}
 }
 
+CON_COMMAND_F(sar_download_file, "sar_download_file <url> <filepath> [directory] - Downloads a file from a URL and saves it to a path relative to game directory (e.g. portal2)\nIf directory isn't specified or invalid, looks for and overwrites existing file or uses base game directory\n", FCVAR_DONTRECORD) {
+	if (args.ArgC() < 3 || args.ArgC() > 4 || !args[1][0] || !args[2][0]) {
+		return console->Print(sar_download_file.ThisPtr()->m_pszHelpString);
+	}
+
+	std::string domain = std::regex_replace(args[1], std::regex("^[htps]*://([^/?:]+)/?.*$"), "$1");
+
+	if (!strcmp(domain.c_str(), args[1])) return console->Print("Invalid URL.\n"); // URL is missing protocol. Reject.
+
+	if (!Utils::EndsWith(domain, "portal2.sr") && !Utils::StartsWith(args[1], "https://raw.githubusercontent.com/p2sr/")) {
+		return console->Print("URL domain is not portal2.sr.\n");
+	}
+
+	std::string filepath = args[2];
+	std::string gamedir = "";
+	
+	auto paths = fileSystem->GetSearchPaths();
+	if (args.ArgC() > 3 && args[3][0]) {
+		for (auto path : paths) {
+			if (strstr(path.c_str(), args[3]) == NULL) continue;
+			gamedir = path;
+			break;
+		}
+	}
+	if (gamedir == "") {
+		gamedir = std::string(engine->GetGameDirectory()) + "/";
+		for (auto path : paths) {
+			if (!std::ifstream(path + filepath).good()) continue;
+			gamedir = path;
+			break;
+		}
+	}
+
+	CURL *curl = curl_easy_init();
+	FILE *fp;
+	CURLcode res;
+	if (curl) {
+		fp = fopen((gamedir + filepath + ".tmp").c_str(), "wb");
+		curl_easy_setopt(curl, CURLOPT_URL, args[1]);
+		curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, NULL);
+		curl_easy_setopt(curl, CURLOPT_WRITEDATA, fp);
+		res = curl_easy_perform(curl);
+		curl_easy_cleanup(curl);
+		fclose(fp);
+	}
+
+	if (res == CURLE_OK) {
+		std::filesystem::remove(gamedir + filepath);
+		std::filesystem::copy(gamedir + filepath + ".tmp", gamedir + filepath);
+	} else {
+		console->Print("An error occurred\n");
+	}
+
+	std::filesystem::remove(gamedir + filepath + ".tmp");
+}
+
 static void SetSvar(std::string name, std::string val) {
 	g_svars[name] = val;
 	if (g_persistentSvars.count(name) != 0) SavePersistentSvars();