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{{>licenseInfo}}

package {{invokerPackage}}.auth;

import {{invokerPackage}}.Pair;

import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.function.Supplier;

{{>generatedAnnotation}}
public class HttpBearerAuth implements Authentication {
  private final String scheme;
  private Supplier tokenSupplier;

  public HttpBearerAuth(String scheme) {
    this.scheme = scheme;
  }

  /**
   * Gets the token, which together with the scheme, will be sent as the value of the Authorization header.
   *
   * @return The bearer token
   */
  public String getBearerToken() {
    return tokenSupplier.get();
  }

  /**
   * Sets the token, which together with the scheme, will be sent as the value of the Authorization header.
   *
   * @param bearerToken The bearer token to send in the Authorization header
   */
  public void setBearerToken(String bearerToken) {
    this.tokenSupplier = () -> bearerToken;
  }

  /**
   * Sets the supplier of tokens, which together with the scheme, will be sent as the value of the Authorization header.
   *
   * @param tokenSupplier The supplier of bearer tokens to send in the Authorization header
   */
  public void setBearerToken(Supplier tokenSupplier) {
    this.tokenSupplier = tokenSupplier;
  }

  @Override
  public void applyToParams(List queryParams, Map headerParams, Map cookieParams) {
    String bearerToken = Optional.ofNullable(tokenSupplier).map(Supplier::get).orElse(null);
    if (bearerToken == null) {
      return;
    }

    headerParams.put("Authorization", (scheme != null ? upperCaseBearer(scheme) + " " : "") + bearerToken);
  }

  private static String upperCaseBearer(String scheme) {
    return ("bearer".equalsIgnoreCase(scheme)) ? "Bearer" : scheme;
  }
}