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ironijunior/CeaserChyper.java

Created April 13, 2020 22:13
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AceleraDEV
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CeaserChyper.java
package com.ironijunior;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.databind.ObjectMapper;
import lombok.Getter;
import lombok.Setter;
import lombok.ToString;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.http.HttpEntity;
import org.springframework.http.MediaType;
import org.springframework.http.client.MultipartBodyBuilder;
import org.springframework.util.MultiValueMap;
import org.springframework.web.reactive.function.BodyInserters;
import org.springframework.web.reactive.function.client.WebClient;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.nio.file.attribute.FileAttribute;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
/**
* Application's main class
*/
@SpringBootApplication
public class Application {
private static final String TOKEN = "29895a1a0cdb9051322421ddc10a6a1673fb498b";
private static final int A_ASCII = 97;
private static final int Z_ASCII = 122;
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
WebClient client = WebClient.builder().build();
System.out.println(">>>> Running");
client.get().uri("https://api.codenation.dev/v1/challenge/dev-ps/generate-data?token=" + TOKEN)
.exchange()
.subscribe(clientResponse -> {
clientResponse.bodyToMono(Answer.class)
.map(answer -> {
String decypher = decypherAnswer(answer);
answer.setDecifrado(decypher);
return answer;
})
.map(answer -> {
answer.setResumoCriptografico(generateSha1(answer.getDecifrado()));
return answer;
})
.map(answer -> {
MultiValueMap<String, HttpEntity<?>> map = null;
try(FileWriter file = new FileWriter("C://Temp//answer.json")) {
file.write(new ObjectMapper().writeValueAsString(answer));
file.flush();
} catch (IOException e) {
e.printStackTrace();
}
return answer;
})
.subscribe(System.out::println);
});
}
private static String decypherAnswer(Answer answer) {
StringBuilder sb = new StringBuilder();
int limit = Z_ASCII - answer.getNumeroCasas();
for (char c: answer.getCifrado().toCharArray()) {
int ascii = (int)c;
if (isLetter(ascii)) {
if (ascii > limit) {
int rest = answer.getNumeroCasas() - (Z_ASCII - ascii) - 1; //-1 bc should consider the a
ascii = A_ASCII + rest;
} else {
ascii += answer.getNumeroCasas();
}
}
sb.append((char) ascii);
}
return sb.toString();
}
private static boolean isLetter(int ascii) {
return ascii >= A_ASCII && ascii <= Z_ASCII;
}
private static String generateSha1(String value) {
MessageDigest mDigest = null;
try {
mDigest = MessageDigest.getInstance("SHA1");
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
byte[] result = mDigest.digest(value.getBytes());
StringBuilder sb = new StringBuilder();
for (byte b : result) {
sb.append(Integer.toString((b & 0xff) + 0x100, 16).substring(1));
}
return sb.toString();
}
}
@Getter
@Setter
@ToString
class Answer {
@JsonProperty("numero_casas")
private Integer numeroCasas;
private String token;
private String cifrado;
private String decifrado;
@JsonProperty("resumo_criptografico")
private String resumoCriptografico;
}
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