Port web_service from Citra

src/web_service/web_backend.h

@@ -0,0 +1,91 @@
+// Copyright 2017 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <functional>
+#include <future>
+#include <string>
+#include <tuple>
+#include <httplib.h>
+#include "common/common_types.h"
+#include "common/web_result.h"
+
+namespace httplib {
+class Client;
+}
+
+namespace WebService {
+
+class Client {
+public:
+    Client(const std::string& host, const std::string& username, const std::string& token);
+
+    /**
+     * Posts JSON to the specified path.
+     * @param path the URL segment after the host address.
+     * @param data String of JSON data to use for the body of the POST request.
+     * @param allow_anonymous If true, allow anonymous unauthenticated requests.
+     * @return the result of the request.
+     */
+    Common::WebResult PostJson(const std::string& path, const std::string& data,
+                               bool allow_anonymous) {
+        return GenericJson("POST", path, data, allow_anonymous);
+    }
+
+    /**
+     * Gets JSON from the specified path.
+     * @param path the URL segment after the host address.
+     * @param allow_anonymous If true, allow anonymous unauthenticated requests.
+     * @return the result of the request.
+     */
+    Common::WebResult GetJson(const std::string& path, bool allow_anonymous) {
+        return GenericJson("GET", path, "", allow_anonymous);
+    }
+
+    /**
+     * Deletes JSON to the specified path.
+     * @param path the URL segment after the host address.
+     * @param data String of JSON data to use for the body of the DELETE request.
+     * @param allow_anonymous If true, allow anonymous unauthenticated requests.
+     * @return the result of the request.
+     */
+    Common::WebResult DeleteJson(const std::string& path, const std::string& data,
+                                 bool allow_anonymous) {
+        return GenericJson("DELETE", path, data, allow_anonymous);
+    }
+
+private:
+    /// A generic function handles POST, GET and DELETE request together
+    Common::WebResult GenericJson(const std::string& method, const std::string& path,
+                                  const std::string& data, bool allow_anonymous);
+
+    /**
+     * A generic function with explicit authentication method specified
+     * JWT is used if the jwt parameter is not empty
+     * username + token is used if jwt is empty but username and token are not empty
+     * anonymous if all of jwt, username and token are empty
+     */
+    Common::WebResult GenericJson(const std::string& method, const std::string& path,
+                                  const std::string& data, const std::string& jwt = "",
+                                  const std::string& username = "", const std::string& token = "");
+
+    // Retrieve a new JWT from given username and token
+    void UpdateJWT();
+
+    std::string host;
+    std::string username;
+    std::string token;
+    std::string jwt;
+    std::unique_ptr<httplib::Client> cli;
+
+    struct JWTCache {
+        std::string username;
+        std::string token;
+        std::string jwt;
+    };
+    static JWTCache jwt_cache;
+};
+
+} // namespace WebService