codewars #68 Predict your age! (7kyu)

Task

You are working for NoVirus Security Solutions and they ask you to make a scanner that scans a file inputted by the user with the function scanFile(File,VirusDB) that takes a File and a VirusDB object and return whether a file is safe or not. Remember: the searches need to be non-Case-Sensitive

Your class also has the function setScanIntensity(int) which changes the scan intensity. This will only receive values 0, 1, 2 or 3. This has been done for you.

The scan intensity determines the arrays from the database that will be used. i.e.:

scanIntensity 0 means off(every file is considered safe)

scanIntensity 1 means that only the array intensity1Signatures will be used

scanIntensity 2 means that the arrays intensity1Signatures and intensity2Signatures will be used

scanIntensity 3 means that all 3 arrays will be used

Outputs

The outputs should be: "Filename is safe" or "Filename is not safe" (Filename is the name of the file that you can get with file.getName() )

File Class

class File{
  private String name;
  private String data;

  public File(String name,String data){
    this.name = name;
    this.data = data;
  }

  //used in output
  public String getName(){
    return this.name;
  }

  //the String that you need to scan.
  public String getData(){
    return this.data;
  }
}

VirusDB Class

class VirusDB{
   private String[] intensity1Signatures;
   private String[] intensity2Signatures;
   private String[] intensity3Signatures;

   public VirusDB(String[] intensity1Signatures,String[] intensity2Signatures,String[] intensity3Signatures){
     this.intensity1Signatures = intensity1Signatures;
     this.intensity2Signatures = intensity2Signatures;
     this.intensity3Signatures = intensity3Signatures;
   }

   public String[] getSignatures(int arrayNum){
     switch (arrayNum){
       case 1:return this.intensity1Signatures;
       case 2:return this.intensity2Signatures;
       case 3:return this.intensity3Signatures;
       default:return new String[0];
     }
   }
}

Examples

 String[] intensity1signatures = new String[]{
        "malware",
        "virus",
        "infect"
      };

      String[] intensity2signatures = new String[]{
        "ransomware",
        "trojan",
        "trojanHorse",
        "worm",
        "spyware",
        "keystrokelogger",
        "adware",
        "botnet",
        "rootkit",
      };

      String[] intensity3signatures = new String[]{
        "DeleteSys32",
        "OverideMBR",
        "EncryptAll",
        "openrandomwebsite",
        "openrandwebsite",
        "sendalldata",
        "recordKeyboard",
        "recordmouse",
        "destroy",
        "overheat",
        "getfullcontrol",
        "uploadharddrive",
        "uploadharddisk",
        "overload",
        "changeOS",
        "encrypt",
        "changeDesktop",
        "ddos",
        "dos",
        "hide",
        "inject",
        "ransom",
        "getcreditcardinfo",
        "getpasswords",
        "getpass",
      };

public class AntiVirus{
  
  private int scanIntensity = 0;
  
  //this method is ready for you.
  public void setScanIntensity(int level){
    scanIntensity = level;
  }
  
  //write this method.
  public String scanFile(File file,VirusDB database){
	String data = file.getData().toLowerCase();
    for(int i = 0; i <= scanIntensity; i ++){
        String [] signatures = database.getSignatures(i);
        for (String signature : signatures) {
		      if(data.contains(signature))
			      return file.getName() + " is not safe";
  	    }
     }

     return file.getName() + " is safe";
  }
  
}