feat(youtube): Add Image Request

pom.xml

@@ -50,8 +50,8 @@
                 <artifactId>maven-compiler-plugin</artifactId>
                 <version>3.6.1</version>
                 <configuration>
-                    <source>8</source>
-                    <target>8</target>
+                    <source>11</source>
+                    <target>11</target>
                     <compilerArgs>-Xlint</compilerArgs>
                 </configuration>
             </plugin>

src/de/steamwar/lobby/map/YouTubeLatest.java

@@ -0,0 +1,63 @@
+package de.steamwar.lobby.map;
+
+import javax.imageio.ImageIO;
+import java.awt.image.BufferedImage;
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.URI;
+import java.net.http.HttpClient;
+import java.net.http.HttpRequest;
+import java.net.http.HttpResponse;
+import java.util.Optional;
+
+public class YouTubeLatest {
+    private static final String YOUTUBE_LATEST_URL = "https://tools.tastethecode.com/youtube-latest/r/steamwar";
+    private static final URI YOUTUBE_LATEST_URI = URI.create(YOUTUBE_LATEST_URL);
+
+    public static BufferedImage getLatestImage() {
+        HttpClient client = HttpClient.newBuilder().followRedirects(HttpClient.Redirect.NEVER).build();
+        HttpRequest request = HttpRequest.newBuilder().uri(YOUTUBE_LATEST_URI).GET().build();
+
+        try {
+            HttpResponse res = client.send(request, HttpResponse.BodyHandlers.discarding());
+            Optional<String> ou = res.headers().firstValue("Location");
+            if(ou.isPresent()) {
+                String url = ou.get();
+                String videoId = getVideoId(url);
+                if(videoId != null) {
+                    String thumbnailUrl = getThumbnailUrl(videoId);
+                    return getImage(thumbnailUrl);
+                } else {
+                    throw new SecurityException("Could not get latest image from YouTube");
+                }
+            } else {
+                throw new IOException("No redirect header found");
+            }
+        } catch (Exception e) {
+            throw new SecurityException("Could not get latest image from YouTube", e);
+        }
+    }
+
+    private static String getVideoId(String url) {
+        if(url.startsWith("https://www.youtube.com/watch?v=")) {
+            return url.substring("https://www.youtube.com/watch?v=".length());
+        }
+        return null;
+    }
+
+    private static String getThumbnailUrl(String videoId) {
+        return "https://img.youtube.com/vi/" + videoId + "/maxresdefault.jpg";
+    }
+
+    private static BufferedImage getImage(String url) {
+        HttpClient client = HttpClient.newBuilder().followRedirects(HttpClient.Redirect.NEVER).build();
+        HttpRequest request = HttpRequest.newBuilder().uri(URI.create(url)).GET().build();
+
+        try {
+            HttpResponse<InputStream> res = client.send(request, HttpResponse.BodyHandlers.ofInputStream());
+            return ImageIO.read(res.body());
+        } catch (Exception e) {
+            throw new SecurityException("Could not get latest image from YouTube", e);
+        }
+    }
+}