Done

src/main/java/tech/nevets/ngxinstaller/Server.java

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+package tech.nevets.ngxinstaller;
+
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+import com.google.gson.JsonObject;
+
+import java.util.Timer;
+import java.util.TimerTask;
+
+import static spark.Spark.*;
+
+public class Server {
+    private static final Gson GSON = new GsonBuilder().setPrettyPrinting().create();
+    public static void main(String[] args) {
+        port(8080);
+        post("/ngx/create", (req, res) -> {
+            JsonObject jsonObject = GSON.fromJson(req.body(), JsonObject.class);
+            TextStorage ts = TextStorage.createPaste(jsonObject.get("content").getAsString());
+            return "{ \"url\":\"https://api.nevets.tech/ngx/raw/" + ts.getId() + "\" }";
+        });
+        get("/ngx/raw/*", (req, res) -> {
+            String id = req.splat()[0];
+            TextStorage ts = TextStorage.getPaste(id);
+            return GSON.toJson(ts);
+        });
+
+
+        Timer timer = new Timer();
+        TimerTask tt = new GCTask();
+        timer.schedule(tt, 0, 60000);
+    }
+
+    static class GCTask extends TimerTask {
+        @Override
+        public void run() {
+            TextStorage.garbageCollect();
+        }
+    }
+}

src/main/java/tech/nevets/ngxinstaller/TextStorage.java

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+package tech.nevets.ngxinstaller;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Random;
+import java.util.UUID;
+import java.util.concurrent.ThreadLocalRandom;
+
+public class TextStorage {
+    private final String id;
+    private final String text;
+    private final long expiration;
+
+    private static final List<TextStorage> DB = new ArrayList<>();
+
+    private TextStorage(String id, String text, long expiration) {
+        this.id = id;
+        this.text = text;
+        this.expiration = expiration;
+    }
+
+    public String getId() {
+        return this.id;
+    }
+
+    public static TextStorage getPaste(String id) {
+        for (TextStorage ts : DB) {
+            if (ts.id.equals(id)) {
+                return ts;
+            }
+        }
+        return null;
+    }
+
+    public static TextStorage createPaste(String text) {
+        TextStorage ts = new TextStorage(generateId(), text, System.currentTimeMillis() + 3600000);
+        DB.add(ts);
+        return ts;
+    }
+
+    private static String generateId() {
+        Random rand = ThreadLocalRandom.current();
+        UUID uuid = UUID.randomUUID();
+        String strUuid = uuid.toString().replace("-", "");
+        int randInt = rand.nextInt(strUuid.length() - 4);
+        return strUuid.substring(randInt, randInt + 4);
+    }
+
+    public static void garbageCollect() {
+        DB.removeIf(ts -> ts.expiration < System.currentTimeMillis());
+    }
+}