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/*
 * Copyright 2011-2024 GatlingCorp (https://gatling.io)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

//
// Copyright (c) 2018 AsyncHttpClient Project. All rights reserved.
//
// This program is licensed to you under the Apache License Version 2.0,
// and you may not use this file except in compliance with the Apache License Version 2.0.
// You may obtain a copy of the Apache License Version 2.0 at
//     http://www.apache.org/licenses/LICENSE-2.0.
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the Apache License Version 2.0 is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the Apache License Version 2.0 for the specific language governing permissions and
// limitations there under.
//

package io.gatling.http.client.uri;

import static io.gatling.http.client.util.Assertions.assertNotEmpty;
import static io.gatling.http.client.util.MiscUtils.isEmpty;
import static io.gatling.http.client.util.MiscUtils.isNonEmpty;

import io.gatling.http.client.Param;
import io.gatling.shared.util.StringBuilderPool;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public final class Uri {

  public static final String HTTP = "http";
  public static final String HTTPS = "https";
  public static final String WS = "ws";
  public static final String WSS = "wss";
  private final String scheme;
  private final String userInfo;
  private final String host;
  private final int port;
  private final String query;
  private final String path;
  private final String fragment;
  private String url;
  private boolean secured;
  private boolean webSocket;

  public Uri(
      String scheme,
      String userInfo,
      String host,
      int port,
      String path,
      String query,
      String fragment) {

    this.scheme = assertNotEmpty(scheme, "scheme");
    this.userInfo = userInfo;
    this.host = assertNotEmpty(host, "host");
    this.port = port;
    this.path = path;
    this.query = query;
    this.fragment = fragment;
    this.secured = HTTPS.equals(scheme) || WSS.equals(scheme);
    this.webSocket = WS.equals(scheme) || WSS.equals(scheme);
  }

  public static Uri create(String originalUrl) {
    return create(null, originalUrl);
  }

  public static Uri create(Uri context, final String originalUrl) {
    UriParser parser = new UriParser();
    parser.parse(context, originalUrl);

    if (isEmpty(parser.scheme)) {
      throw new IllegalArgumentException(
          originalUrl + " could not be parsed into a proper Uri, missing scheme");
    }
    if (isEmpty(parser.host)) {
      throw new IllegalArgumentException(
          originalUrl + " could not be parsed into a proper Uri, missing host");
    }

    return new Uri(
        parser.scheme,
        parser.userInfo,
        parser.host,
        parser.port,
        parser.path,
        parser.query,
        parser.fragment);
  }

  public String getQuery() {
    return query;
  }

  public String getPath() {
    return path;
  }

  public String getUserInfo() {
    return userInfo;
  }

  // TODO rename to getExplicitPort ?
  public int getPort() {
    return port;
  }

  public String getScheme() {
    return scheme;
  }

  public String getHost() {
    return host;
  }

  public String getFragment() {
    return fragment;
  }

  public boolean isSecured() {
    return secured;
  }

  public boolean isWebSocket() {
    return webSocket;
  }

  public URI toJavaNetURI() throws URISyntaxException {
    return new URI(toUrl());
  }

  // TODO rename to getPort / getImplicitPort ?
  public int getExplicitPort() {
    return port == -1 ? getSchemeDefaultPort() : port;
  }

  public int getSchemeDefaultPort() {
    return isSecured() ? 443 : 80;
  }

  public String toUrl() {
    if (url == null) {
      StringBuilder sb = toBaseUrl0();
      if (path != null) {
        sb.append(path);
      }
      if (query != null) {
        sb.append('?').append(query);
      }
      url = sb.toString();
    }
    return url;
  }

  public String toFullUrl() {
    return fragment == null ? toUrl() : toUrl() + "#" + fragment;
  }

  /**
   * @return [scheme]://[hostname](:[port])/path. Port is omitted if it matches the scheme's default
   *     one.
   */
  public String toUrlWithoutQuery() {
    StringBuilder sb = toBaseUrl0();
    if (isNonEmpty(path)) {
      sb.append(path);
    }
    return sb.toString();
  }

  /**
   * @return [scheme]://[hostname](:[port]). Port is omitted if it matches the scheme's default one.
   */
  public String getBaseUrl() {
    return toBaseUrl0().toString();
  }

  private StringBuilder toBaseUrl0() {
    StringBuilder sb = StringBuilderPool.DEFAULT.get();
    sb.append(scheme).append("://");
    if (userInfo != null) {
      sb.append(userInfo).append('@');
    }
    sb.append(host);
    if (port != -1 && port != getSchemeDefaultPort()) {
      sb.append(':').append(port);
    }
    return sb;
  }

  public String toRelativeUrl() {
    StringBuilder sb = StringBuilderPool.DEFAULT.get();
    if (isNonEmpty(path)) sb.append(path);
    else sb.append('/');
    if (query != null) sb.append('?').append(query);

    return sb.toString();
  }

  public String getAuthority() {
    return host + ":" + getExplicitPort();
  }

  public boolean isSameBase(Uri other) {
    return scheme.equals(other.getScheme())
        && host.equals(other.getHost())
        && getExplicitPort() == other.getExplicitPort();
  }

  public String getNonEmptyPath() {
    return isNonEmpty(path) ? path : "/";
  }

  public static String getLastDirectoryPath(String path) {
    int lastSlash = path.lastIndexOf('/');
    if (lastSlash > 0) {
      // mote than one slack
      return path.substring(0, lastSlash);
    }
    return "/";
  }

  public String getLastDirectoryPath() {
    return getLastDirectoryPath(path);
  }

  public List getEncodedQueryParams() {
    if (isNonEmpty(query)) {
      List queryParams = new ArrayList<>(1);
      for (String queryStringParam : query.split("&")) {
        int pos = queryStringParam.indexOf('=');
        if (pos <= 0) queryParams.add(new Param(queryStringParam, null));
        else
          queryParams.add(
              new Param(queryStringParam.substring(0, pos), queryStringParam.substring(pos + 1)));
      }
      return queryParams;
    }

    return Collections.emptyList();
  }

  public Uri withNewScheme(String newScheme) {
    return new Uri(newScheme, userInfo, host, port, path, query, fragment);
  }

  public Uri withNewQuery(String newQuery) {
    return new Uri(scheme, userInfo, host, port, path, newQuery, fragment);
  }

  @Override
  public String toString() {
    // for now, but might change
    return toUrl();
  }

  @Override
  public int hashCode() {
    final int prime = 31;
    int result = 1;
    result = prime * result + ((host == null) ? 0 : host.hashCode());
    result = prime * result + ((path == null) ? 0 : path.hashCode());
    result = prime * result + port;
    result = prime * result + ((query == null) ? 0 : query.hashCode());
    result = prime * result + ((scheme == null) ? 0 : scheme.hashCode());
    result = prime * result + ((userInfo == null) ? 0 : userInfo.hashCode());
    return result;
  }

  @Override
  public boolean equals(Object obj) {
    if (this == obj) return true;
    if (obj == null) return false;
    if (getClass() != obj.getClass()) return false;
    Uri other = (Uri) obj;
    if (host == null) {
      if (other.host != null) return false;
    } else if (!host.equals(other.host)) return false;
    if (path == null) {
      if (other.path != null) return false;
    } else if (!path.equals(other.path)) return false;
    if (port != other.port) return false;
    if (query == null) {
      if (other.query != null) return false;
    } else if (!query.equals(other.query)) return false;
    if (scheme == null) {
      if (other.scheme != null) return false;
    } else if (!scheme.equals(other.scheme)) return false;
    if (userInfo == null) {
      if (other.userInfo != null) return false;
    } else if (!userInfo.equals(other.userInfo)) return false;
    return true;
  }
}




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