How can I get authorization token in rest API using rest assured? Is it possible? - rest

Question

Currently using Postman I have to do post request to API_URL/login and I pass username and password and in return i get token see below:
Example Request:
/login
POST
Body
{
"username": "admin",
"password": "admin"
}
Return
{
"token": "1234-56789-..."
}
Can you tell me how would I do .. i tried using .parameters but it says deprecated...

Answer 1

You'd have to know what the schema is of the response. For instance, if the output is like thus:
{
"success": true,
"authorization_token": "eyJ0eXAiOiJCZWFy...",
"refresh_token": "eyJ0eXAiOiJCZWFyZ...",
"type": "Bearer",
...
}
Knowing the schema, you can extract the entire output and parse through it, like thus:
import io.restassured.response.Response;
Response response =
RestAssured.given().
header("Content-Type", "application/json").
body(loginPayload).
when().
post("/login").
then().
log().ifError().
statusCode(200).
contentType("application/vnd.api+json").
body("$", hasKey("authorization_token")). //authorization_token is present in the response
body("any { it.key == 'authorization_token' }", is(notNullValue())). //authorization_token value is not null - has a value
extract().response();
The auth token could then be set to a string variable
String auth_token = response.path("authorization_token").toString();
extract().response(); returns the entire reponse, but you could change this to extract().path("authorization_token") for just single string

Answer 2

REST Assured supports mapping Java objects to/from JSON. You just need a JSON parser such as Jackson or Gson on the classpath.
First define a class to represent the user credentials:
class Credentials {
private String username;
private String password;
// Getters and setters
}
Then define class to represent the authentication token:
class AuthenticationToken {
private String token;
// Getters and setters
}
And finally perform the request to exchange the credentials for the token:
#Test
public void authenticate() {
Credentials credentials = new Credentials();
credentials.setUsername("admin");
credentials.setPassword("password");
AuthenticationToken authenticationToken =
given()
.accept("application/json")
.contentType("application/json")
.body(credentials)
.expect()
.statusCode(200)
.when()
.post("/login")
.then()
.log().all()
.extract()
.body().as(AuthenticationToken.class);
assertNotNull(authenticationToken.getToken());
}