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/* ******************************************************************************
 * Copyright (c) 2020 Stephane Bastian
 *
 * This program and the accompanying materials are made available under the 2
 * terms of the Eclipse Public License 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * SPDX-License-Identifier: EPL-2.0 3
 *
 * Contributors: 4
 *   Stephane Bastian - initial API and implementation
 ********************************************************************************/
package com.arangodb.shaded.vertx.ext.auth.authentication;

import com.arangodb.shaded.vertx.codegen.annotations.DataObject;
import com.arangodb.shaded.vertx.core.http.HttpMethod;
import com.arangodb.shaded.vertx.core.json.JsonObject;

import java.util.ArrayList;
import java.util.List;

/**
 * Credentials used by any {@link AuthenticationProvider} that requires Tokens, such as OAuth2 or JWT
 * to perform its authentication
 *
 * @author Paulo Lopes
 *
 */
@DataObject(generateConverter = true, publicConverter = false)
public class TokenCredentials implements Credentials {

  private String token;
  private List scopes;

  public TokenCredentials() {}

  public TokenCredentials(String token) {
    this.token = token;
  }

  public TokenCredentials(JsonObject jsonObject) {
    TokenCredentialsConverter.fromJson(jsonObject, this);
  }

  public String getToken() {
    return token;
  }

  public TokenCredentials setToken(String token) {
    this.token = token;
    return this;
  }

  public List getScopes() {
    return scopes;
  }

  public TokenCredentials setScopes(List scopes) {
    this.scopes = scopes;
    return this;
  }

  public TokenCredentials addScope(String scope) {
    if (scopes == null) {
      scopes = new ArrayList<>();
    }
    scopes.add(scope);
    return this;
  }

  @Override
  public  void checkValid(V arg) throws CredentialValidationException {
    if (token == null || token.length() == 0) {
      throw new CredentialValidationException("token cannot be null or empty");
    }
  }

  public JsonObject toJson() {
    JsonObject result = new JsonObject();
    TokenCredentialsConverter.toJson(this, result);
    return result;
  }

  @Override
  public String toString() {
    return toJson().encode();
  }

  @Override
  public TokenCredentials applyHttpChallenge(String challenge, HttpMethod method, String uri, Integer nc, String cnonce) throws CredentialValidationException {
    if (challenge != null) {
      int spc = challenge.indexOf(' ');

      if (!"Bearer".equalsIgnoreCase(challenge.substring(0, spc))) {
        throw new IllegalArgumentException("Only 'Bearer' auth-scheme is supported");
      }
    }

    // validate
    checkValid(null);
    return this;
  }

  @Override
  public String toHttpAuthorization() {
    return "Bearer " + token;
  }
}