Created the ResponseController.java

src/main/java/de/gnmyt/mcdash/http/ResponseController.java

@@ -0,0 +1,183 @@
+package de.gnmyt.mcdash.http;
+
+import com.google.gson.Gson;
+import com.sun.net.httpserver.HttpExchange;
+
+
+import java.io.IOException;
+import java.io.OutputStream;
+import java.nio.charset.StandardCharsets;
+import java.util.Collections;
+import java.util.HashMap;
+
+public class ResponseController {
+
+    private HttpExchange exchange;
+    private Response response = new Response();
+
+    /**
+     * Basic constructor of the {@link ResponseController}
+     *
+     * @param exchange The exchange from {@link de.gnmyt.mcdash.handler.DefaultHandler#handle}
+     */
+    public ResponseController(HttpExchange exchange) {
+        this.exchange = exchange;
+    }
+
+    /**
+     * Gets the current exchange
+     *
+     * @return the current exchange
+     */
+    public HttpExchange getExchange() {
+        return exchange;
+    }
+
+    /**
+     * Writes a string to the output
+     *
+     * @param output The output you want to add
+     * @return the current {@link ResponseController} instance
+     */
+    public ResponseController writeToOutput(String output) {
+        response.addOutput(output);
+        return this;
+    }
+
+    /**
+     * Sets the response code
+     *
+     * @param code The new code
+     * @return the current {@link ResponseController} instance
+     */
+    public ResponseController code(int code) {
+        response.setCode(code);
+        return this;
+    }
+
+    /**
+     * Adds a response header
+     *
+     * @param name  The name of the header
+     * @param value The value of the header
+     * @return the current {@link ResponseController} instance
+     */
+    public ResponseController header(String name, String value) {
+        response.addHeader(name, value);
+        return this;
+    }
+
+    /**
+     * Sets the response content type
+     *
+     * @param type The new content type
+     * @return the current {@link ResponseController} instance
+     */
+    public ResponseController type(ContentType type) {
+        response.setContentType(type);
+        return this;
+    }
+
+    /**
+     * Sends a text response to the client
+     *
+     * @param output The output you want to send
+     */
+    public void text(String output) {
+        writeToOutput(output);
+        send();
+    }
+
+    /**
+     * Sends a byte response to the client
+     *
+     * @param bytes The bytes you want to send
+     */
+    public void bytes(byte[] bytes) {
+        response.setBinaryOutput(bytes);
+        send();
+    }
+
+    /**
+     * Sends a json response to the client
+     *
+     * @param values The values you want to send
+     */
+    @SafeVarargs
+    public final void json(HashMap<String, Object>... values) {
+        response.setContentType(ContentType.JSON);
+
+        Gson gson = new Gson();
+
+        String json = gson.toJson(values.length == 1 ? values[0] : values);
+
+        writeToOutput(json);
+        send();
+    }
+
+    public JSONBuilder json() {
+        return new JSONBuilder(this);
+    }
+
+    /**
+     * Sends a single json message to the client
+     *
+     * @param key   The name of the json response
+     * @param value The value of the json response
+     */
+    public void jsonMessage(String key, String value) {
+        HashMap<String, Object> map = new HashMap<>();
+        map.put(key, value);
+        json(map);
+    }
+
+    /**
+     * Sends a json message to the client
+     *
+     * @param message The message you want to send
+     */
+    public void message(String message) {
+        jsonMessage("message", message);
+    }
+
+    /**
+     * Sends a formatted json message to the client
+     *
+     * @param message The formatted message you want to send
+     * @param values  The values you want to put in the format
+     */
+    public void messageFormat(String message, Object... values) {
+        message(String.format(message, values));
+    }
+
+    /**
+     * Sends the current response
+     */
+    public void send() {
+        OutputStream os = exchange.getResponseBody();
+        response
+                .addHeader("Server", "DashboardWrapper")
+                .addHeader("Content-Type", response.getContentType().getType())
+                .addHeader("Access-Control-Allow-Origin", "*");
+
+        if (exchange.getRequestMethod().equalsIgnoreCase("OPTIONS"))
+            response.addHeader("Access-Control-Allow-Methods", "GET, OPTIONS, POST")
+                    .addHeader("Access-Control-Allow-Headers", "*");
+
+        response.getHeaders().forEach((key, value) -> exchange.getResponseHeaders().put(key, Collections.singletonList(value)));
+
+        byte[] bs = response.getBinaryOutput() == null ? response.getOutput().getBytes(StandardCharsets.UTF_8)
+                : response.getBinaryOutput();
+
+        try {
+            if (exchange.getRequestMethod().equalsIgnoreCase("OPTIONS")) {
+                exchange.sendResponseHeaders(204, -1L);
+            } else {
+                exchange.sendResponseHeaders(response.getCode(), bs.length);
+                os.write(bs);
+            }
+            os.close();
+        } catch (IOException ignored) {
+        }
+    }
+}