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Current File : /home/aeaw/www/node_modules/follow-redirects/index.js
var url = require("url");
var http = require("http");
var https = require("https");
var assert = require("assert");
var Writable = require("stream").Writable;
var debug = require("debug")("follow-redirects");

// RFC7231§4.2.1: Of the request methods defined by this specification,
// the GET, HEAD, OPTIONS, and TRACE methods are defined to be safe.
var SAFE_METHODS = { GET: true, HEAD: true, OPTIONS: true, TRACE: true };

// Create handlers that pass events from native requests
var eventHandlers = Object.create(null);
["abort", "aborted", "error", "socket", "timeout"].forEach(function (event) {
  eventHandlers[event] = function (arg) {
    this._redirectable.emit(event, arg);
  };
});

// An HTTP(S) request that can be redirected
function RedirectableRequest(options, responseCallback) {
  // Initialize the request
  Writable.call(this);
  options.headers = options.headers || {};
  this._options = options;
  this._redirectCount = 0;
  this._redirects = [];
  this._requestBodyLength = 0;
  this._requestBodyBuffers = [];

  // Since http.request treats host as an alias of hostname,
  // but the url module interprets host as hostname plus port,
  // eliminate the host property to avoid confusion.
  if (options.host) {
    // Use hostname if set, because it has precedence
    if (!options.hostname) {
      options.hostname = options.host;
    }
    delete options.host;
  }

  // Attach a callback if passed
  if (responseCallback) {
    this.on("response", responseCallback);
  }

  // React to responses of native requests
  var self = this;
  this._onNativeResponse = function (response) {
    self._processResponse(response);
  };

  // Complete the URL object when necessary
  if (!options.pathname && options.path) {
    var searchPos = options.path.indexOf("?");
    if (searchPos < 0) {
      options.pathname = options.path;
    }
    else {
      options.pathname = options.path.substring(0, searchPos);
      options.search = options.path.substring(searchPos);
    }
  }

  // Perform the first request
  this._performRequest();
}
RedirectableRequest.prototype = Object.create(Writable.prototype);

// Writes buffered data to the current native request
RedirectableRequest.prototype.write = function (data, encoding, callback) {
  // Validate input and shift parameters if necessary
  if (!(typeof data === "string" || typeof data === "object" && ("length" in data))) {
    throw new Error("data should be a string, Buffer or Uint8Array");
  }
  if (typeof encoding === "function") {
    callback = encoding;
    encoding = null;
  }

  // Ignore empty buffers, since writing them doesn't invoke the callback
  // https://github.com/nodejs/node/issues/22066
  if (data.length === 0) {
    if (callback) {
      callback();
    }
    return;
  }
  // Only write when we don't exceed the maximum body length
  if (this._requestBodyLength + data.length <= this._options.maxBodyLength) {
    this._requestBodyLength += data.length;
    this._requestBodyBuffers.push({ data: data, encoding: encoding });
    this._currentRequest.write(data, encoding, callback);
  }
  // Error when we exceed the maximum body length
  else {
    this.emit("error", new Error("Request body larger than maxBodyLength limit"));
    this.abort();
  }
};

// Ends the current native request
RedirectableRequest.prototype.end = function (data, encoding, callback) {
  // Shift parameters if necessary
  if (typeof data === "function") {
    callback = data;
    data = encoding = null;
  }
  else if (typeof encoding === "function") {
    callback = encoding;
    encoding = null;
  }

  // Write data and end
  var currentRequest = this._currentRequest;
  this.write(data || "", encoding, function () {
    currentRequest.end(null, null, callback);
  });
};

// Sets a header value on the current native request
RedirectableRequest.prototype.setHeader = function (name, value) {
  this._options.headers[name] = value;
  this._currentRequest.setHeader(name, value);
};

// Clears a header value on the current native request
RedirectableRequest.prototype.removeHeader = function (name) {
  delete this._options.headers[name];
  this._currentRequest.removeHeader(name);
};

// Proxy all other public ClientRequest methods
[
  "abort", "flushHeaders", "getHeader",
  "setNoDelay", "setSocketKeepAlive", "setTimeout",
].forEach(function (method) {
  RedirectableRequest.prototype[method] = function (a, b) {
    return this._currentRequest[method](a, b);
  };
});

// Proxy all public ClientRequest properties
["aborted", "connection", "socket"].forEach(function (property) {
  Object.defineProperty(RedirectableRequest.prototype, property, {
    get: function () { return this._currentRequest[property]; },
  });
});

// Executes the next native request (initial or redirect)
RedirectableRequest.prototype._performRequest = function () {
  // Load the native protocol
  var protocol = this._options.protocol;
  var nativeProtocol = this._options.nativeProtocols[protocol];
  if (!nativeProtocol) {
    this.emit("error", new Error("Unsupported protocol " + protocol));
    return;
  }

  // If specified, use the agent corresponding to the protocol
  // (HTTP and HTTPS use different types of agents)
  if (this._options.agents) {
    var scheme = protocol.substr(0, protocol.length - 1);
    this._options.agent = this._options.agents[scheme];
  }

  // Create the native request
  var request = this._currentRequest =
        nativeProtocol.request(this._options, this._onNativeResponse);
  this._currentUrl = url.format(this._options);

  // Set up event handlers
  request._redirectable = this;
  for (var event in eventHandlers) {
    /* istanbul ignore else */
    if (event) {
      request.on(event, eventHandlers[event]);
    }
  }

  // End a redirected request
  // (The first request must be ended explicitly with RedirectableRequest#end)
  if (this._isRedirect) {
    // Write the request entity and end.
    var i = 0;
    var buffers = this._requestBodyBuffers;
    (function writeNext() {
      if (i < buffers.length) {
        var buffer = buffers[i++];
        request.write(buffer.data, buffer.encoding, writeNext);
      }
      else {
        request.end();
      }
    }());
  }
};

// Processes a response from the current native request
RedirectableRequest.prototype._processResponse = function (response) {
  // Store the redirected response
  if (this._options.trackRedirects) {
    this._redirects.push({
      url: this._currentUrl,
      headers: response.headers,
      statusCode: response.statusCode,
    });
  }

  // RFC7231§6.4: The 3xx (Redirection) class of status code indicates
  // that further action needs to be taken by the user agent in order to
  // fulfill the request. If a Location header field is provided,
  // the user agent MAY automatically redirect its request to the URI
  // referenced by the Location field value,
  // even if the specific status code is not understood.
  var location = response.headers.location;
  if (location && this._options.followRedirects !== false &&
      response.statusCode >= 300 && response.statusCode < 400) {
    // RFC7231§6.4: A client SHOULD detect and intervene
    // in cyclical redirections (i.e., "infinite" redirection loops).
    if (++this._redirectCount > this._options.maxRedirects) {
      this.emit("error", new Error("Max redirects exceeded."));
      return;
    }

    // RFC7231§6.4: Automatic redirection needs to done with
    // care for methods not known to be safe […],
    // since the user might not wish to redirect an unsafe request.
    // RFC7231§6.4.7: The 307 (Temporary Redirect) status code indicates
    // that the target resource resides temporarily under a different URI
    // and the user agent MUST NOT change the request method
    // if it performs an automatic redirection to that URI.
    var header;
    var headers = this._options.headers;
    if (response.statusCode !== 307 && !(this._options.method in SAFE_METHODS)) {
      this._options.method = "GET";
      // Drop a possible entity and headers related to it
      this._requestBodyBuffers = [];
      for (header in headers) {
        if (/^content-/i.test(header)) {
          delete headers[header];
        }
      }
    }

    // Drop the Host header, as the redirect might lead to a different host
    if (!this._isRedirect) {
      for (header in headers) {
        if (/^host$/i.test(header)) {
          delete headers[header];
        }
      }
    }

    // Perform the redirected request
    var redirectUrl = url.resolve(this._currentUrl, location);
    debug("redirecting to", redirectUrl);
    Object.assign(this._options, url.parse(redirectUrl));
    this._isRedirect = true;
    this._performRequest();

    // Discard the remainder of the response to avoid waiting for data
    response.destroy();
  }
  else {
    // The response is not a redirect; return it as-is
    response.responseUrl = this._currentUrl;
    response.redirects = this._redirects;
    this.emit("response", response);

    // Clean up
    this._requestBodyBuffers = [];
  }
};

// Wraps the key/value object of protocols with redirect functionality
function wrap(protocols) {
  // Default settings
  var exports = {
    maxRedirects: 21,
    maxBodyLength: 10 * 1024 * 1024,
  };

  // Wrap each protocol
  var nativeProtocols = {};
  Object.keys(protocols).forEach(function (scheme) {
    var protocol = scheme + ":";
    var nativeProtocol = nativeProtocols[protocol] = protocols[scheme];
    var wrappedProtocol = exports[scheme] = Object.create(nativeProtocol);

    // Executes a request, following redirects
    wrappedProtocol.request = function (options, callback) {
      if (typeof options === "string") {
        options = url.parse(options);
        options.maxRedirects = exports.maxRedirects;
      }
      else {
        options = Object.assign({
          protocol: protocol,
          maxRedirects: exports.maxRedirects,
          maxBodyLength: exports.maxBodyLength,
        }, options);
      }
      options.nativeProtocols = nativeProtocols;
      assert.equal(options.protocol, protocol, "protocol mismatch");
      debug("options", options);
      return new RedirectableRequest(options, callback);
    };

    // Executes a GET request, following redirects
    wrappedProtocol.get = function (options, callback) {
      var request = wrappedProtocol.request(options, callback);
      request.end();
      return request;
    };
  });
  return exports;
}

// Exports
module.exports = wrap({ http: http, https: https });
module.exports.wrap = wrap;

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