Initial commit

.gitignore

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+# ---> Java
+*.class
+
+# Mobile Tools for Java (J2ME)
+.mtj.tmp/
+
+# Package Files #
+*.jar
+*.war
+*.ear
+
+# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+hs_err_pid*
+
+# IntelliJ IDEA
+*.iml
+.idea/
+
+# Maven
+target/
+dependency-reduced-pom.xml

pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>eu.mikroskeem</groupId>
+    <artifactId>mongohackery</artifactId>
+    <version>1.0-SNAPSHOT</version>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>3.5.1</version>
+                <configuration>
+                    <source>1.8</source>
+                    <target>1.8</target>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.mongodb</groupId>
+            <artifactId>mongo-java-driver</artifactId>
+            <version>3.4.1</version>
+        </dependency>
+    </dependencies>
+
+</project>

src/main/java/eu/mikroskeem/mongohackery/Main.java

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+package eu.mikroskeem.mongohackery;
+
+import com.mongodb.MongoClient;
+import com.mongodb.client.MongoDatabase;
+import com.mongodb.client.gridfs.GridFSBucket;
+import com.mongodb.client.gridfs.GridFSBuckets;
+import com.mongodb.client.gridfs.model.GridFSUploadOptions;
+import org.bson.Document;
+import org.bson.types.ObjectId;
+
+import java.io.BufferedReader;
+import java.io.ByteArrayInputStream;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.util.stream.Collectors;
+
+import static com.mongodb.client.model.Filters.eq;
+
+public class Main {
+    public static void main(String... args){
+        new Main();
+    }
+
+    public Main(){
+        MongoClient client = new MongoClient();
+        MongoDatabase leTest = client.getDatabase("leTest");
+        GridFSBucket gridfs = GridFSBuckets.create(leTest, "files");
+
+        /*
+         * Ransom data
+         * Should use file here actually
+        */
+        InputStream is = new ByteArrayInputStream("topkek".getBytes());
+
+        /* Remove (if present) */
+        try {
+            gridfs.delete(gridfs.find(eq("filename", "topkek")).first().getId());
+        }
+        catch(NullPointerException ignored){}
+
+        /* Insert */
+        GridFSUploadOptions options = new GridFSUploadOptions()
+                .chunkSizeBytes(1024)
+                .metadata(new Document("contentType", "text/plain"));
+        /*
+         * NOTE: 'contentType' isn't standard! It is here, because I want to see
+         * It is there, because I tend to use it with GridFS
+         */
+
+        ObjectId id = gridfs.uploadFromStream("topkek", is, options);
+        System.out.println(id);
+
+        /* Now read */
+        InputStream os = gridfs.openDownloadStream(gridfs.find(eq("filename", "topkek")).first().getId());
+        String res = new BufferedReader(new InputStreamReader(os))
+                .lines().collect(Collectors.joining("\n"));
+        System.out.println(res);
+
+        /* Remove */
+        gridfs.delete(gridfs.find(eq("filename", "topkek")).first().getId());
+    }
+}