'use strict';

var utils = require('./../utils');
var settle = require('./../core/settle');
var buildFullPath = require('../core/buildFullPath');
var buildURL = require('./../helpers/buildURL');
var getProxyForUrl = require('proxy-from-env').getProxyForUrl;
var http = require('http');
var https = require('https');
var httpFollow = require('follow-redirects/http');
var httpsFollow = require('follow-redirects/https');
var url = require('url');
var path = require('path');
var zlib = require('zlib');
var VERSION = require('./../env/data').version;
var transitionalDefaults = require('../defaults/transitional');
var AxiosError = require('../core/AxiosError');
var CanceledError = require('../cancel/CanceledError');
var platform = require('../platform');
var fromDataURI = require('../helpers/fromDataURI');
var stream = require('stream');
var estimateDataURLDecodedBytes = require('../helpers/estimateDataURLDecodedBytes.js');
var shouldBypassProxy = require('../helpers/shouldBypassProxy');

var isHttps = /https:?/;

var supportedProtocols = platform.protocols.map(function(protocol) {
  return protocol + ':';
});

function dispatchBeforeRedirect(options) {
  if (options.beforeRedirects.proxy) {
    options.beforeRedirects.proxy(options);
  }
  if (options.beforeRedirects.config) {
    options.beforeRedirects.config(options);
  }
}

function removeProxyAuthorization(headers) {
  Object.keys(headers).forEach(function removeHeader(header) {
    if (header.toLowerCase() === 'proxy-authorization') {
      delete headers[header];
    }
  });
}

function normalizeSocketPath(socketPath) {
  if (/^\\\\[.?]\\pipe\\/i.test(socketPath)) {
    return socketPath;
  }

  return path.resolve(socketPath);
}

function getAllowedSocketPaths(config) {
  var allowedSocketPaths = config.allowedSocketPaths;

  if (
    allowedSocketPaths === null ||
    typeof allowedSocketPaths === 'undefined'
  ) {
    return null;
  }

  if (utils.isString(allowedSocketPaths)) {
    return [allowedSocketPaths];
  }

  if (utils.isArray(allowedSocketPaths)) {
    for (var i = 0; i < allowedSocketPaths.length; i++) {
      if (!utils.isString(allowedSocketPaths[i])) {
        return false;
      }
    }

    return allowedSocketPaths;
  }

  return false;
}

function checkSocketPath(config) {
  var socketPath = config.socketPath;

  if (!socketPath) {
    return null;
  }

  if (!utils.isString(socketPath)) {
    return new AxiosError(
      'config.socketPath must be a string',
      AxiosError.ERR_BAD_OPTION_VALUE,
      config
    );
  }

  var allowedSocketPaths = getAllowedSocketPaths(config);

  if (allowedSocketPaths === false) {
    return new AxiosError(
      'config.allowedSocketPaths must be a string, an array of strings, or null',
      AxiosError.ERR_BAD_OPTION_VALUE,
      config
    );
  }

  if (allowedSocketPaths) {
    var normalizedSocketPath = normalizeSocketPath(socketPath);
    var allowed = allowedSocketPaths.some(
      function isAllowed(allowedSocketPath) {
        return normalizeSocketPath(allowedSocketPath) === normalizedSocketPath;
      }
    );

    if (!allowed) {
      return new AxiosError(
        'config.socketPath is not allowed by config.allowedSocketPaths',
        AxiosError.ERR_BAD_OPTION_VALUE,
        config
      );
    }
  }

  return null;
}

/**
 *
 * @param {http.ClientRequestArgs} options
 * @param {AxiosProxyConfig} configProxy
 * @param {string} location
 */
function setProxy(options, configProxy, location) {
  var proxy = configProxy;
  if (!proxy && proxy !== false) {
    var proxyUrl = getProxyForUrl(location);
    if (proxyUrl) {
      if (!shouldBypassProxy(location)) {
        proxy = url.parse(proxyUrl);
        // replace 'host' since the proxy object is not a URL object
        proxy.host = proxy.hostname;
      }
    }
  }
  if (!proxy) {
    removeProxyAuthorization(options.headers);
  }
  if (proxy) {
    // Basic proxy authorization
    var proxyAuth = utils.hasOwnProperty(proxy, 'auth')
      ? proxy.auth
      : undefined;
    if (proxyAuth) {
      // Support proxy auth object form
      if (utils.isObject(proxyAuth)) {
        var proxyUsername = utils.hasOwnProperty(proxyAuth, 'username')
          ? proxyAuth.username
          : '';
        var proxyPassword = utils.hasOwnProperty(proxyAuth, 'password')
          ? proxyAuth.password
          : '';
        proxyAuth =
          proxyUsername || proxyPassword
            ? proxyUsername + ':' + proxyPassword
            : undefined;
      }
      if (proxyAuth) {
        var base64 = Buffer.from(proxyAuth, 'utf8').toString('base64');
        removeProxyAuthorization(options.headers);
        options.headers['Proxy-Authorization'] = 'Basic ' + base64;
      }
    }

    options.headers.host =
      options.hostname + (options.port ? ':' + options.port : '');
    options.hostname = proxy.host;
    options.host = proxy.host;
    options.port = proxy.port;
    options.path = location;
    if (proxy.protocol) {
      options.protocol = proxy.protocol;
    }
  }

  options.beforeRedirects.proxy = function beforeRedirect(redirectOptions) {
    // Configure proxy for redirected request, passing the original config proxy to apply
    // the exact same logic as if the redirected request was performed by axios directly.
    setProxy(redirectOptions, configProxy, redirectOptions.href);
  };
}

/*eslint consistent-return:0*/
module.exports = function httpAdapter(config) {
  return new Promise(function dispatchHttpRequest(
    resolvePromise,
    rejectPromise
  ) {
    var onCanceled;
    function done() {
      if (config.cancelToken) {
        config.cancelToken.unsubscribe(onCanceled);
      }

      if (config.signal) {
        config.signal.removeEventListener('abort', onCanceled);
      }
    }
    var resolve = function resolve(value) {
      done();
      resolvePromise(value);
    };
    var rejected = false;
    var reject = function reject(value) {
      done();
      rejected = true;
      rejectPromise(value);
    };
    var data = config.data;
    var responseType = config.responseType;
    var responseEncoding = config.responseEncoding;
    var method = config.method.toUpperCase();

    // Parse url
    var fullPath = buildFullPath(
      config.baseURL,
      config.url,
      config.allowAbsoluteUrls
    );
    var parsed = url.parse(fullPath);
    var protocol = parsed.protocol || supportedProtocols[0];

    if (protocol === 'data:') {
      // Apply the same semantics as HTTP: only enforce if a finite, non-negative cap is set.
      if (config.maxContentLength > -1) {
        // Use the exact string passed to fromDataURI (config.url); fall back to fullPath if needed.
        var dataUrl = String(config.url || fullPath || '');
        var estimated = estimateDataURLDecodedBytes(dataUrl);

        if (estimated > config.maxContentLength) {
          return reject(
            new AxiosError(
              'maxContentLength size of ' +
                config.maxContentLength +
              ' exceeded',
              AxiosError.ERR_BAD_RESPONSE,
              config
            )
          );
        }
      }

      var convertedData;

      if (method !== 'GET') {
        return settle(resolve, reject, {
          status: 405,
          statusText: 'method not allowed',
          headers: {},
          config: config
        });
      }

      try {
        var envOption = utils.hasOwnProperty(config, 'env')
          ? config.env
          : undefined;
        convertedData = fromDataURI(config.url, responseType === 'blob', {
          Blob: envOption && envOption.Blob
        });
      } catch (err) {
        throw AxiosError.from(err, AxiosError.ERR_BAD_REQUEST, config);
      }

      if (responseType === 'text') {
        convertedData = convertedData.toString(responseEncoding);

        if (!responseEncoding || responseEncoding === 'utf8') {
          data = utils.stripBOM(convertedData);
        }
      } else if (responseType === 'stream') {
        convertedData = stream.Readable.from(convertedData);
      }

      return settle(resolve, reject, {
        data: convertedData,
        status: 200,
        statusText: 'OK',
        headers: {},
        config: config
      });
    }

    if (supportedProtocols.indexOf(protocol) === -1) {
      return reject(
        new AxiosError(
          'Unsupported protocol ' + protocol,
          AxiosError.ERR_BAD_REQUEST,
          config
        )
      );
    }

    var headers = config.headers;
    var headerNames = {};

    Object.keys(headers).forEach(function storeLowerName(name) {
      headerNames[name.toLowerCase()] = name;
    });

    // Set User-Agent (required by some servers)
    // See https://github.com/axios/axios/issues/69
    if ('user-agent' in headerNames) {
      // User-Agent is specified; handle case where no UA header is desired
      if (!headers[headerNames['user-agent']]) {
        delete headers[headerNames['user-agent']];
      }
      // Otherwise, use specified value
    } else {
      // Only set header if it hasn't been set in config
      headers['User-Agent'] = 'axios/' + VERSION;
    }

    // support for https://www.npmjs.com/package/form-data api
    if (
      utils.isFormData(data) &&
      utils.isFunction(data.getHeaders) &&
      data.getHeaders !== Object.prototype.getHeaders
    ) {
      var formHeaders = data.getHeaders();
      if (config.formDataHeaderPolicy === 'content-only') {
        Object.keys(formHeaders).forEach(function copyContentHeader(name) {
          var lowerName = name.toLowerCase();
          if (lowerName === 'content-type' || lowerName === 'content-length') {
            headers[name] = formHeaders[name];
          }
        });
      } else {
        Object.assign(headers, formHeaders);
      }
    } else if (data && !utils.isStream(data)) {
      if (Buffer.isBuffer(data)) {
        // Nothing to do...
      } else if (utils.isArrayBuffer(data)) {
        data = Buffer.from(new Uint8Array(data));
      } else if (utils.isString(data)) {
        data = Buffer.from(data, 'utf-8');
      } else {
        return reject(
          new AxiosError(
            'Data after transformation must be a string, an ArrayBuffer, a Buffer, or a Stream',
            AxiosError.ERR_BAD_REQUEST,
            config
          )
        );
      }

      if (config.maxBodyLength > -1 && data.length > config.maxBodyLength) {
        return reject(
          new AxiosError(
            'Request body larger than maxBodyLength limit',
            AxiosError.ERR_BAD_REQUEST,
            config
          )
        );
      }

      // Add Content-Length header if data exists
      if (!headerNames['content-length']) {
        headers['Content-Length'] = data.length;
      }
    }

    // HTTP basic authentication
    var auth = undefined;
    if (config.auth) {
      var username = config.auth.username || '';
      var password = config.auth.password || '';
      auth = username + ':' + password;
    }

    if (!auth && parsed.auth) {
      var urlAuth = parsed.auth.split(':');
      var urlUsername = urlAuth[0] || '';
      var urlPassword = urlAuth[1] || '';
      auth = urlUsername + ':' + urlPassword;
    }

    if (auth && headerNames.authorization) {
      delete headers[headerNames.authorization];
    }

    try {
      buildURL(parsed.path, config.params, config.paramsSerializer).replace(
        /^\?/,
        ''
      );
    } catch (err) {
      var customErr = new Error(err.message);
      customErr.config = config;
      customErr.url = config.url;
      customErr.exists = true;
      reject(customErr);
    }

    var options = {
      path: buildURL(
        parsed.path,
        config.params,
        config.paramsSerializer
      ).replace(/^\?/, ''),
      method: method,
      headers: headers,
      agents: { http: config.httpAgent, https: config.httpsAgent },
      auth: auth,
      protocol: protocol,
      beforeRedirect: dispatchBeforeRedirect,
      beforeRedirects: {}
    };

    var socketPathError = checkSocketPath(config);
    if (socketPathError) {
      return reject(socketPathError);
    }

    if (config.socketPath) {
      options.socketPath = config.socketPath;
    } else {
      options.hostname = parsed.hostname;
      options.port = parsed.port;
      setProxy(
        options,
        config.proxy,
        protocol + '//' + parsed.host + options.path
      );
    }

    var transport;
    var isHttpsRequest = isHttps.test(options.protocol);
    options.agent = isHttpsRequest ? config.httpsAgent : config.httpAgent;
    if (utils.hasOwnProperty(config, 'transport') && config.transport) {
      transport = config.transport;
    } else if (config.maxRedirects === 0) {
      transport = isHttpsRequest ? https : http;
    } else {
      if (config.maxRedirects) {
        options.maxRedirects = config.maxRedirects;
      }
      if (config.beforeRedirect) {
        options.beforeRedirects.config = config.beforeRedirect;
      }
      transport = isHttpsRequest ? httpsFollow : httpFollow;
    }

    if (config.maxBodyLength > -1) {
      options.maxBodyLength = config.maxBodyLength;
    } else {
      // follow-redirects does not skip comparison, so it should always succeed for axios -1 unlimited
      options.maxBodyLength = Infinity;
    }

    if (config.insecureHTTPParser) {
      options.insecureHTTPParser = config.insecureHTTPParser;
    }

    // Create the request
    var req = transport.request(options, function handleResponse(res) {
      if (req.aborted) return;

      // uncompress the response body transparently if required
      var responseStream = res;

      // return the last request in case of redirects
      var lastRequest = res.req || req;

      // if decompress disabled we should not decompress
      if (config.decompress !== false) {
        // if no content, but headers still say that it is encoded,
        // remove the header not confuse downstream operations
        if (data && data.length === 0 && res.headers['content-encoding']) {
          delete res.headers['content-encoding'];
        }

        switch (res.headers['content-encoding']) {
        /*eslint default-case:0*/
        case 'gzip':
        case 'compress':
        case 'deflate':
          // add the unzipper to the body stream processing pipeline
          responseStream = responseStream.pipe(zlib.createUnzip());

          // remove the content-encoding in order to not confuse downstream operations
          delete res.headers['content-encoding'];
          break;
        }
      }

      var response = {
        status: res.statusCode,
        statusText: res.statusMessage,
        headers: res.headers,
        config: config,
        request: lastRequest
      };

      if (responseType === 'stream') {
        // Enforce maxContentLength on streamed responses too.
        // Previously the stream path bypassed the size guard because the check only
        // ran on the buffering branch.
        if (config.maxContentLength > -1) {
          var maxContentLength = config.maxContentLength;
          var streamedBytes = 0;
          var limiter = new stream.Transform({
            transform: function transformChunk(chunk, encoding, callback) {
              streamedBytes += chunk.length;
              if (streamedBytes > maxContentLength) {
                callback(
                  new AxiosError(
                    'maxContentLength size of ' +
                      maxContentLength +
                    ' exceeded',
                    AxiosError.ERR_BAD_RESPONSE,
                    config,
                    lastRequest
                  )
                );
                return;
              }
              callback(null, chunk);
            }
          });
          limiter.on('error', function handleLimiterError() {
            rejected = true;
            responseStream.destroy();
          });
          responseStream.on('error', function forwardError(err) {
            limiter.destroy(err);
          });
          response.data = limiter;
          settle(resolve, reject, response);
          // Defer piping via setImmediate so the caller's `.then` (a microtask)
          // has run and attached any `error`/`data` listeners before chunks flow
          // through the transform. `process.nextTick` would drain before those
          // microtasks and lose the error event.
          setImmediate(function startPipe() {
            responseStream.pipe(limiter);
          });
        } else {
          response.data = responseStream;
          settle(resolve, reject, response);
        }
      } else {
        var responseBuffer = [];
        var totalResponseBytes = 0;
        responseStream.on('data', function handleStreamData(chunk) {
          responseBuffer.push(chunk);
          totalResponseBytes += chunk.length;

          // make sure the content length is not over the maxContentLength if specified
          if (
            config.maxContentLength > -1 &&
            totalResponseBytes > config.maxContentLength
          ) {
            // stream.destroy() emit aborted event before calling reject() on Node.js v16
            rejected = true;
            responseStream.destroy();
            reject(
              new AxiosError(
                'maxContentLength size of ' +
                  config.maxContentLength +
                  ' exceeded',
                AxiosError.ERR_BAD_RESPONSE,
                config,
                lastRequest
              )
            );
          }
        });

        responseStream.on('aborted', function handlerStreamAborted() {
          if (rejected) {
            return;
          }
          responseStream.destroy();
          reject(
            new AxiosError(
              'response stream aborted',
              AxiosError.ECONNABORTED,
              config,
              lastRequest
            )
          );
        });

        responseStream.on('error', function handleStreamError(err) {
          if (req.aborted) return;
          reject(AxiosError.from(err, null, config, lastRequest));
        });

        responseStream.on('end', function handleStreamEnd() {
          try {
            var responseData =
              responseBuffer.length === 1
                ? responseBuffer[0]
                : Buffer.concat(responseBuffer);
            if (responseType !== 'arraybuffer') {
              responseData = responseData.toString(responseEncoding);
              if (!responseEncoding || responseEncoding === 'utf8') {
                responseData = utils.stripBOM(responseData);
              }
            }
            response.data = responseData;
          } catch (err) {
            reject(
              AxiosError.from(err, null, config, response.request, response)
            );
          }
          settle(resolve, reject, response);
        });
      }
    });

    // Handle errors
    req.on('error', function handleRequestError(err) {
      // @todo remove
      // if (req.aborted && err.code !== AxiosError.ERR_FR_TOO_MANY_REDIRECTS) return;
      reject(AxiosError.from(err, null, config, req));
    });

    // set tcp keep alive to prevent drop connection by peer
    req.on('socket', function handleRequestSocket(socket) {
      // default interval of sending ack packet is 1 minute
      socket.setKeepAlive(true, 1000 * 60);
    });

    // Handle request timeout
    if (config.timeout) {
      // Force an int timeout so the `req` interface gets a clean number.
      // The try/catch is required: merged config values have a null prototype,
      // and parseInt on a null-prototype object throws "Cannot convert object
      // to primitive value" because there is no inherited toString. Treating
      // that as NaN routes to the same ERR_BAD_OPTION_VALUE rejection as any
      // other unparsable value.
      var timeout;
      try {
        timeout = parseInt(config.timeout, 10);
      } catch (err) {
        timeout = NaN;
      }

      if (isNaN(timeout)) {
        reject(
          new AxiosError(
            'error trying to parse `config.timeout` to int',
            AxiosError.ERR_BAD_OPTION_VALUE,
            config,
            req
          )
        );

        return;
      }

      // Sometime, the response will be very slow, and does not respond, the connect event will be block by event loop system.
      // And timer callback will be fired, and abort() will be invoked before connection, then get "socket hang up" and code ECONNRESET.
      // At this time, if we have a large number of request, nodejs will hang up some socket on background. and the number will up and up.
      // And then these socket which be hang up will devouring CPU little by little.
      // ClientRequest.setTimeout will be fired on the specify milliseconds, and can make sure that abort() will be fired after connect.
      req.setTimeout(timeout, function handleRequestTimeout() {
        req.abort();
        var timeoutErrorMessage = config.timeout
          ? 'timeout of ' + config.timeout + 'ms exceeded'
          : 'timeout exceeded';
        var transitional = config.transitional || transitionalDefaults;
        if (config.timeoutErrorMessage) {
          timeoutErrorMessage = config.timeoutErrorMessage;
        }
        reject(
          new AxiosError(
            timeoutErrorMessage,
            transitional.clarifyTimeoutError
              ? AxiosError.ETIMEDOUT
              : AxiosError.ECONNABORTED,
            config,
            req
          )
        );
      });
    }

    if (config.cancelToken || config.signal) {
      // Handle cancellation
      // eslint-disable-next-line func-names
      onCanceled = function(cancel) {
        if (req.aborted) return;

        req.abort();
        reject(
          !cancel || cancel.type
            ? new CanceledError(null, config, req)
            : cancel
        );
      };

      config.cancelToken && config.cancelToken.subscribe(onCanceled);
      if (config.signal) {
        config.signal.aborted
          ? onCanceled()
          : config.signal.addEventListener('abort', onCanceled);
      }
    }

    // Send the request
    if (utils.isStream(data)) {
      data.on('error', function handleStreamError(err) {
        reject(AxiosError.from(err, config, null, req));
      });

      // follow-redirects enforces options.maxBodyLength for stream uploads, but the
      // native http/https transport (used when maxRedirects === 0) does not.
      // Count bytes ourselves so the limit is always honored.
      var nativeTransport = transport === http || transport === https;
      if (nativeTransport && config.maxBodyLength > -1) {
        var maxBodyLength = config.maxBodyLength;
        var uploadedBytes = 0;
        var bodyLimiter = new stream.Transform({
          transform: function transformChunk(chunk, encoding, callback) {
            uploadedBytes += chunk.length;
            if (uploadedBytes > maxBodyLength) {
              callback(
                new AxiosError(
                  'Request body larger than maxBodyLength limit',
                  AxiosError.ERR_BAD_REQUEST,
                  config,
                  req
                )
              );
              return;
            }
            callback(null, chunk);
          }
        });
        bodyLimiter.on('error', function handleLimiterError(err) {
          if (rejected) return;
          rejected = true;
          try {
            data.unpipe(bodyLimiter);
          } catch (e) {
            /* noop */
          }
          try {
            bodyLimiter.unpipe(req);
          } catch (e) {
            /* noop */
          }
          req.destroy();
          reject(err);
        });
        data.pipe(bodyLimiter).pipe(req);
      } else {
        data.pipe(req);
      }
    } else {
      req.end(data);
    }
  });
};
