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package com.redhat.parodos.examples.utils;
import java.net.URI;
import java.util.Base64;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.http.ResponseEntity;
import org.springframework.web.client.RestTemplate;
/**
* RestUtils is a utility class. All its methods must be declared as static so they can't
* be overridden.
*/
public abstract class RestUtils {
/**
* The constructor is private so it'll prevent instantiation.
*/
private RestUtils() {
throw new UnsupportedOperationException("Suppress default constructor for non instantiability");
}
/**
* Create a new resource by POSTing the given payload to the URL, and returns the
* response as ResponseEntity.
* @see org.springframework.web.client.RestTemplate#postForEntity(URI, Object, Class)
* @param urlString the URL
* @param payload object to post
* @return @see org.springframework.http.ResponseEntity
*/
public static ResponseEntity executePost(String urlString, String payload) {
RestTemplate restTemplate = new RestTemplate();
return restTemplate.postForEntity(urlString, payload, String.class);
}
/**
* Create a new resource by POSTing the given requestEntity to the URL, and returns
* the response as String.
* @see org.springframework.web.client.RestTemplate#postForEntity(URI, Object, Class)
* @param urlString the URL
* @param requestEntity object to post
* @return the response as string
*/
public static ResponseEntity executePost(String urlString, HttpEntity requestEntity) {
RestTemplate restTemplate = new RestTemplate();
return restTemplate.exchange(urlString, HttpMethod.POST, requestEntity, String.class);
}
public static ResponseEntity executePost(String urlString, T requestDto, String username, String password,
Class responseType) {
HttpEntity request = getRequestWithHeaders(requestDto, username, password);
RestTemplate restTemplate = new RestTemplate();
return restTemplate.postForEntity(urlString, request, responseType);
}
/**
* Execute the GET HTTP method to the given URL
* @param urlString the URL
* @return HTTP response as string
*/
public static ResponseEntity executeGet(String urlString) {
RestTemplate restTemplate = new RestTemplate();
return restTemplate.getForEntity(urlString, String.class);
}
/**
* Execute the GET HTTP method to the given URL, writing the given request entity to
* the request, and returns the response as ResponseEntity.
*
* @see org.springframework.web.client.RestTemplate#exchange(String, HttpMethod,
* HttpEntity, Class, Object...)
* @param urlString the URL
* @param username the username
* @param password the password
* @return @see org.springframework.http.ResponseEntity
*/
public static ResponseEntity restExchange(String urlString, String username, String password) {
RestTemplate restTemplate = new RestTemplate();
return restTemplate.exchange(urlString, HttpMethod.GET, getRequestWithHeaders(username, password),
String.class);
}
public static ResponseEntity restExchange(String urlString, String username, String password,
Class responseType) {
RestTemplate restTemplate = new RestTemplate();
return restTemplate.exchange(urlString, HttpMethod.GET, getRequestWithHeaders(username, password),
responseType);
}
/**
* Creates a new HttpHeader and set the Authorization object according to @see
* getBase64Creds
* @param username the username
* @param password the password
* @return the @see org.springframework.http.HttpEntity
*/
public static HttpEntity getRequestWithHeaders(String username, String password) {
String base64Creds = getBase64Creds(username, password);
HttpHeaders headers = new HttpHeaders();
headers.add("Authorization", "Basic " + base64Creds);
return new HttpEntity<>(headers);
}
/**
* Creates a new HttpHeader with request and set the Authorization object according
* to @see getBase64Creds
* @param username the username
* @param password the password
* @return the @see org.springframework.http.HttpEntity
*/
public static HttpEntity getRequestWithHeaders(T request, String username, String password) {
String base64Creds = getBase64Creds(username, password);
HttpHeaders headers = new HttpHeaders();
headers.add("Authorization", "Basic " + base64Creds);
return new HttpEntity<>(request, headers);
}
/**
* Generates a Base64 encoding of username:password string
* @param username the username
* @param password the password
* @return the Base64 encoded string
*/
public static String getBase64Creds(String username, String password) {
String plainCreds = username + ":" + password;
byte[] plainCredsBytes = plainCreds.getBytes();
byte[] base64CredsBytes = Base64.getEncoder().encode(plainCredsBytes);
return new String(base64CredsBytes);
}
}
