Moving scripts and utilities into a new utilities dir

6 files changed, 1977 insertions, 0 deletions

diff --git a/utilities/hash_script/node_modules/node-fetch/lib/body.js b/utilities/hash_script/node_modules/node-fetch/lib/body.js
new file mode 100644
index 0000000..19bc003
--- /dev/null
+++ b/utilities/hash_script/node_modules/node-fetch/lib/body.js
@@ -0,0 +1,261 @@
+
+/**
+ * body.js
+ *
+ * Body interface provides common methods for Request and Response
+ */
+
+var convert = require('encoding').convert;
+var bodyStream = require('is-stream');
+var PassThrough = require('stream').PassThrough;
+var FetchError = require('./fetch-error');
+
+module.exports = Body;
+
+/**
+ * Body class
+ *
+ * @param   Stream  body  Readable stream
+ * @param   Object  opts  Response options
+ * @return  Void
+ */
+function Body(body, opts) {
+
+	opts = opts || {};
+
+	this.body = body;
+	this.bodyUsed = false;
+	this.size = opts.size || 0;
+	this.timeout = opts.timeout || 0;
+	this._raw = [];
+	this._abort = false;
+
+}
+
+/**
+ * Decode response as json
+ *
+ * @return  Promise
+ */
+Body.prototype.json = function() {
+
+	var self = this;
+
+	return this._decode().then(function(buffer) {
+		try {
+			return JSON.parse(buffer.toString());
+		} catch (err) {
+			return Body.Promise.reject(new FetchError('invalid json response body at ' + self.url + ' reason: ' + err.message, 'invalid-json'));
+		}
+	});
+
+};
+
+/**
+ * Decode response as text
+ *
+ * @return  Promise
+ */
+Body.prototype.text = function() {
+
+	return this._decode().then(function(buffer) {
+		return buffer.toString();
+	});
+
+};
+
+/**
+ * Decode response as buffer (non-spec api)
+ *
+ * @return  Promise
+ */
+Body.prototype.buffer = function() {
+
+	return this._decode();
+
+};
+
+/**
+ * Decode buffers into utf-8 string
+ *
+ * @return  Promise
+ */
+Body.prototype._decode = function() {
+
+	var self = this;
+
+	if (this.bodyUsed) {
+		return Body.Promise.reject(new Error('body used already for: ' + this.url));
+	}
+
+	this.bodyUsed = true;
+	this._bytes = 0;
+	this._abort = false;
+	this._raw = [];
+
+	return new Body.Promise(function(resolve, reject) {
+		var resTimeout;
+
+		// body is string
+		if (typeof self.body === 'string') {
+			self._bytes = self.body.length;
+			self._raw = [new Buffer(self.body)];
+			return resolve(self._convert());
+		}
+
+		// body is buffer
+		if (self.body instanceof Buffer) {
+			self._bytes = self.body.length;
+			self._raw = [self.body];
+			return resolve(self._convert());
+		}
+
+		// allow timeout on slow response body
+		if (self.timeout) {
+			resTimeout = setTimeout(function() {
+				self._abort = true;
+				reject(new FetchError('response timeout at ' + self.url + ' over limit: ' + self.timeout, 'body-timeout'));
+			}, self.timeout);
+		}
+
+		// handle stream error, such as incorrect content-encoding
+		self.body.on('error', function(err) {
+			reject(new FetchError('invalid response body at: ' + self.url + ' reason: ' + err.message, 'system', err));
+		});
+
+		// body is stream
+		self.body.on('data', function(chunk) {
+			if (self._abort || chunk === null) {
+				return;
+			}
+
+			if (self.size && self._bytes + chunk.length > self.size) {
+				self._abort = true;
+				reject(new FetchError('content size at ' + self.url + ' over limit: ' + self.size, 'max-size'));
+				return;
+			}
+
+			self._bytes += chunk.length;
+			self._raw.push(chunk);
+		});
+
+		self.body.on('end', function() {
+			if (self._abort) {
+				return;
+			}
+
+			clearTimeout(resTimeout);
+			resolve(self._convert());
+		});
+	});
+
+};
+
+/**
+ * Detect buffer encoding and convert to target encoding
+ * ref: http://www.w3.org/TR/2011/WD-html5-20110113/parsing.html#determining-the-character-encoding
+ *
+ * @param   String  encoding  Target encoding
+ * @return  String
+ */
+Body.prototype._convert = function(encoding) {
+
+	encoding = encoding || 'utf-8';
+
+	var ct = this.headers.get('content-type');
+	var charset = 'utf-8';
+	var res, str;
+
+	// header
+	if (ct) {
+		// skip encoding detection altogether if not html/xml/plain text
+		if (!/text\/html|text\/plain|\+xml|\/xml/i.test(ct)) {
+			return Buffer.concat(this._raw);
+		}
+
+		res = /charset=([^;]*)/i.exec(ct);
+	}
+
+	// no charset in content type, peek at response body for at most 1024 bytes
+	if (!res && this._raw.length > 0) {
+		for (var i = 0; i < this._raw.length; i++) {
+			str += this._raw[i].toString()
+			if (str.length > 1024) {
+				break;
+			}
+		}
+		str = str.substr(0, 1024);
+	}
+
+	// html5
+	if (!res && str) {
+		res = /<meta.+?charset=(['"])(.+?)\1/i.exec(str);
+	}
+
+	// html4
+	if (!res && str) {
+		res = /<meta[\s]+?http-equiv=(['"])content-type\1[\s]+?content=(['"])(.+?)\2/i.exec(str);
+
+		if (res) {
+			res = /charset=(.*)/i.exec(res.pop());
+		}
+	}
+
+	// xml
+	if (!res && str) {
+		res = /<\?xml.+?encoding=(['"])(.+?)\1/i.exec(str);
+	}
+
+	// found charset
+	if (res) {
+		charset = res.pop();
+
+		// prevent decode issues when sites use incorrect encoding
+		// ref: https://hsivonen.fi/encoding-menu/
+		if (charset === 'gb2312' || charset === 'gbk') {
+			charset = 'gb18030';
+		}
+	}
+
+	// turn raw buffers into a single utf-8 buffer
+	return convert(
+		Buffer.concat(this._raw)
+		, encoding
+		, charset
+	);
+
+};
+
+/**
+ * Clone body given Res/Req instance
+ *
+ * @param   Mixed  instance  Response or Request instance
+ * @return  Mixed
+ */
+Body.prototype._clone = function(instance) {
+	var p1, p2;
+	var body = instance.body;
+
+	// don't allow cloning a used body
+	if (instance.bodyUsed) {
+		throw new Error('cannot clone body after it is used');
+	}
+
+	// check that body is a stream and not form-data object
+	// note: we can't clone the form-data object without having it as a dependency
+	if (bodyStream(body) && typeof body.getBoundary !== 'function') {
+		// tee instance body
+		p1 = new PassThrough();
+		p2 = new PassThrough();
+		body.pipe(p1);
+		body.pipe(p2);
+		// set instance body to teed body and return the other teed body
+		instance.body = p1;
+		body = p2;
+	}
+
+	return body;
+}
+
+// expose Promise
+Body.Promise = global.Promise;
diff --git a/utilities/hash_script/node_modules/node-fetch/lib/fetch-error.js b/utilities/hash_script/node_modules/node-fetch/lib/fetch-error.js
new file mode 100644
index 0000000..7cabfb3
--- /dev/null
+++ b/utilities/hash_script/node_modules/node-fetch/lib/fetch-error.js
@@ -0,0 +1,34 @@
+
+/**
+ * fetch-error.js
+ *
+ * FetchError interface for operational errors
+ */
+
+module.exports = FetchError;
+
+/**
+ * Create FetchError instance
+ *
+ * @param   String      message      Error message for human
+ * @param   String      type         Error type for machine
+ * @param   String      systemError  For Node.js system error
+ * @return  FetchError
+ */
+function FetchError(message, type, systemError) {
+
+	// hide custom error implementation details from end-users
+	Error.captureStackTrace(this, this.constructor);
+
+	this.name = this.constructor.name;
+	this.message = message;
+	this.type = type;
+
+	// when err.type is `system`, err.code contains system error code
+	if (systemError) {
+		this.code = this.errno = systemError.code;
+	}
+
+}
+
+require('util').inherits(FetchError, Error);
diff --git a/utilities/hash_script/node_modules/node-fetch/lib/headers.js b/utilities/hash_script/node_modules/node-fetch/lib/headers.js
new file mode 100644
index 0000000..af20749
--- /dev/null
+++ b/utilities/hash_script/node_modules/node-fetch/lib/headers.js
@@ -0,0 +1,141 @@
+
+/**
+ * headers.js
+ *
+ * Headers class offers convenient helpers
+ */
+
+module.exports = Headers;
+
+/**
+ * Headers class
+ *
+ * @param   Object  headers  Response headers
+ * @return  Void
+ */
+function Headers(headers) {
+
+	var self = this;
+	this._headers = {};
+
+	// Headers
+	if (headers instanceof Headers) {
+		headers = headers.raw();
+	}
+
+	// plain object
+	for (var prop in headers) {
+		if (!headers.hasOwnProperty(prop)) {
+			continue;
+		}
+
+		if (typeof headers[prop] === 'string') {
+			this.set(prop, headers[prop]);
+
+		} else if (typeof headers[prop] === 'number' && !isNaN(headers[prop])) {
+			this.set(prop, headers[prop].toString());
+
+		} else if (Array.isArray(headers[prop])) {
+			headers[prop].forEach(function(item) {
+				self.append(prop, item.toString());
+			});
+		}
+	}
+
+}
+
+/**
+ * Return first header value given name
+ *
+ * @param   String  name  Header name
+ * @return  Mixed
+ */
+Headers.prototype.get = function(name) {
+	var list = this._headers[name.toLowerCase()];
+	return list ? list[0] : null;
+};
+
+/**
+ * Return all header values given name
+ *
+ * @param   String  name  Header name
+ * @return  Array
+ */
+Headers.prototype.getAll = function(name) {
+	if (!this.has(name)) {
+		return [];
+	}
+
+	return this._headers[name.toLowerCase()];
+};
+
+/**
+ * Iterate over all headers
+ *
+ * @param   Function  callback  Executed for each item with parameters (value, name, thisArg)
+ * @param   Boolean   thisArg   `this` context for callback function
+ * @return  Void
+ */
+Headers.prototype.forEach = function(callback, thisArg) {
+	Object.getOwnPropertyNames(this._headers).forEach(function(name) {
+		this._headers[name].forEach(function(value) {
+			callback.call(thisArg, value, name, this)
+		}, this)
+	}, this)
+}
+
+/**
+ * Overwrite header values given name
+ *
+ * @param   String  name   Header name
+ * @param   String  value  Header value
+ * @return  Void
+ */
+Headers.prototype.set = function(name, value) {
+	this._headers[name.toLowerCase()] = [value];
+};
+
+/**
+ * Append a value onto existing header
+ *
+ * @param   String  name   Header name
+ * @param   String  value  Header value
+ * @return  Void
+ */
+Headers.prototype.append = function(name, value) {
+	if (!this.has(name)) {
+		this.set(name, value);
+		return;
+	}
+
+	this._headers[name.toLowerCase()].push(value);
+};
+
+/**
+ * Check for header name existence
+ *
+ * @param   String   name  Header name
+ * @return  Boolean
+ */
+Headers.prototype.has = function(name) {
+	return this._headers.hasOwnProperty(name.toLowerCase());
+};
+
+/**
+ * Delete all header values given name
+ *
+ * @param   String  name  Header name
+ * @return  Void
+ */
+Headers.prototype['delete'] = function(name) {
+	delete this._headers[name.toLowerCase()];
+};
+
+/**
+ * Return raw headers (non-spec api)
+ *
+ * @return  Object
+ */
+Headers.prototype.raw = function() {
+	return this._headers;
+};
diff --git a/utilities/hash_script/node_modules/node-fetch/lib/index.js b/utilities/hash_script/node_modules/node-fetch/lib/index.js
new file mode 100644
index 0000000..f100854
--- /dev/null
+++ b/utilities/hash_script/node_modules/node-fetch/lib/index.js
@@ -0,0 +1,1416 @@
+'use strict';
+
+Object.defineProperty(exports, '__esModule', { value: true });
+
+// Based on https://github.com/tmpvar/jsdom/blob/aa85b2abf07766ff7bf5c1f6daafb3726f2f2db5/lib/jsdom/living/blob.js
+// (MIT licensed)
+
+const BUFFER = Symbol('buffer');
+const TYPE = Symbol('type');
+const CLOSED = Symbol('closed');
+
+class Blob {
+	constructor() {
+		Object.defineProperty(this, Symbol.toStringTag, {
+			value: 'Blob',
+			writable: false,
+			enumerable: false,
+			configurable: true
+		});
+
+		this[CLOSED] = false;
+		this[TYPE] = '';
+
+		const blobParts = arguments[0];
+		const options = arguments[1];
+
+		const buffers = [];
+
+		if (blobParts) {
+			const a = blobParts;
+			const length = Number(a.length);
+			for (let i = 0; i < length; i++) {
+				const element = a[i];
+				let buffer;
+				if (element instanceof Buffer) {
+					buffer = element;
+				} else if (ArrayBuffer.isView(element)) {
+					buffer = Buffer.from(element.buffer, element.byteOffset, element.byteLength);
+				} else if (element instanceof ArrayBuffer) {
+					buffer = Buffer.from(element);
+				} else if (element instanceof Blob) {
+					buffer = element[BUFFER];
+				} else {
+					buffer = Buffer.from(typeof element === 'string' ? element : String(element));
+				}
+				buffers.push(buffer);
+			}
+		}
+
+		this[BUFFER] = Buffer.concat(buffers);
+
+		let type = options && options.type !== undefined && String(options.type).toLowerCase();
+		if (type && !/[^\u0020-\u007E]/.test(type)) {
+			this[TYPE] = type;
+		}
+	}
+	get size() {
+		return this[CLOSED] ? 0 : this[BUFFER].length;
+	}
+	get type() {
+		return this[TYPE];
+	}
+	get isClosed() {
+		return this[CLOSED];
+	}
+	slice() {
+		const size = this.size;
+
+		const start = arguments[0];
+		const end = arguments[1];
+		let relativeStart, relativeEnd;
+		if (start === undefined) {
+			relativeStart = 0;
+		} else if (start < 0) {
+			relativeStart = Math.max(size + start, 0);
+		} else {
+			relativeStart = Math.min(start, size);
+		}
+		if (end === undefined) {
+			relativeEnd = size;
+		} else if (end < 0) {
+			relativeEnd = Math.max(size + end, 0);
+		} else {
+			relativeEnd = Math.min(end, size);
+		}
+		const span = Math.max(relativeEnd - relativeStart, 0);
+
+		const buffer = this[BUFFER];
+		const slicedBuffer = buffer.slice(relativeStart, relativeStart + span);
+		const blob = new Blob([], { type: arguments[2] });
+		blob[BUFFER] = slicedBuffer;
+		blob[CLOSED] = this[CLOSED];
+		return blob;
+	}
+	close() {
+		this[CLOSED] = true;
+	}
+}
+
+Object.defineProperty(Blob.prototype, Symbol.toStringTag, {
+	value: 'BlobPrototype',
+	writable: false,
+	enumerable: false,
+	configurable: true
+});
+
+/**
+ * fetch-error.js
+ *
+ * FetchError interface for operational errors
+ */
+
+/**
+ * Create FetchError instance
+ *
+ * @param   String      message      Error message for human
+ * @param   String      type         Error type for machine
+ * @param   String      systemError  For Node.js system error
+ * @return  FetchError
+ */
+function FetchError(message, type, systemError) {
+  Error.call(this, message);
+
+  this.message = message;
+  this.type = type;
+
+  // when err.type is `system`, err.code contains system error code
+  if (systemError) {
+    this.code = this.errno = systemError.code;
+  }
+
+  // hide custom error implementation details from end-users
+  Error.captureStackTrace(this, this.constructor);
+}
+
+FetchError.prototype = Object.create(Error.prototype);
+FetchError.prototype.constructor = FetchError;
+FetchError.prototype.name = 'FetchError';
+
+/**
+ * body.js
+ *
+ * Body interface provides common methods for Request and Response
+ */
+
+const Stream = require('stream');
+
+var _require$1 = require('stream');
+
+const PassThrough$1 = _require$1.PassThrough;
+
+
+const DISTURBED = Symbol('disturbed');
+
+let convert;
+try {
+	convert = require('encoding').convert;
+} catch (e) {}
+
+/**
+ * Body class
+ *
+ * Cannot use ES6 class because Body must be called with .call().
+ *
+ * @param   Stream  body  Readable stream
+ * @param   Object  opts  Response options
+ * @return  Void
+ */
+function Body(body) {
+	var _ref = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {},
+	    _ref$size = _ref.size;
+
+	let size = _ref$size === undefined ? 0 : _ref$size;
+	var _ref$timeout = _ref.timeout;
+	let timeout = _ref$timeout === undefined ? 0 : _ref$timeout;
+
+	if (body == null) {
+		// body is undefined or null
+		body = null;
+	} else if (typeof body === 'string') {
+		// body is string
+	} else if (isURLSearchParams(body)) {
+		// body is a URLSearchParams
+	} else if (body instanceof Blob) {
+		// body is blob
+	} else if (Buffer.isBuffer(body)) {
+		// body is buffer
+	} else if (body instanceof Stream) {
+		// body is stream
+	} else {
+		// none of the above
+		// coerce to string
+		body = String(body);
+	}
+	this.body = body;
+	this[DISTURBED] = false;
+	this.size = size;
+	this.timeout = timeout;
+}
+
+Body.prototype = {
+	get bodyUsed() {
+		return this[DISTURBED];
+	},
+
+	/**
+  * Decode response as ArrayBuffer
+  *
+  * @return  Promise
+  */
+	arrayBuffer() {
+		return consumeBody.call(this).then(function (buf) {
+			return buf.buffer.slice(buf.byteOffset, buf.byteOffset + buf.byteLength);
+		});
+	},
+
+	/**
+  * Return raw response as Blob
+  *
+  * @return Promise
+  */
+	blob() {
+		let ct = this.headers && this.headers.get('content-type') || '';
+		return consumeBody.call(this).then(function (buf) {
+			return Object.assign(
+			// Prevent copying
+			new Blob([], {
+				type: ct.toLowerCase()
+			}), {
+				[BUFFER]: buf
+			});
+		});
+	},
+
+	/**
+  * Decode response as json
+  *
+  * @return  Promise
+  */
+	json() {
+		var _this = this;
+
+		return consumeBody.call(this).then(function (buffer) {
+			try {
+				return JSON.parse(buffer.toString());
+			} catch (err) {
+				return Body.Promise.reject(new FetchError(`invalid json response body at ${_this.url} reason: ${err.message}`, 'invalid-json'));
+			}
+		});
+	},
+
+	/**
+  * Decode response as text
+  *
+  * @return  Promise
+  */
+	text() {
+		return consumeBody.call(this).then(function (buffer) {
+			return buffer.toString();
+		});
+	},
+
+	/**
+  * Decode response as buffer (non-spec api)
+  *
+  * @return  Promise
+  */
+	buffer() {
+		return consumeBody.call(this);
+	},
+
+	/**
+  * Decode response as text, while automatically detecting the encoding and
+  * trying to decode to UTF-8 (non-spec api)
+  *
+  * @return  Promise
+  */
+	textConverted() {
+		var _this2 = this;
+
+		return consumeBody.call(this).then(function (buffer) {
+			return convertBody(buffer, _this2.headers);
+		});
+	}
+
+};
+
+Body.mixIn = function (proto) {
+	for (const name of Object.getOwnPropertyNames(Body.prototype)) {
+		// istanbul ignore else: future proof
+		if (!(name in proto)) {
+			const desc = Object.getOwnPropertyDescriptor(Body.prototype, name);
+			Object.defineProperty(proto, name, desc);
+		}
+	}
+};
+
+/**
+ * Decode buffers into utf-8 string
+ *
+ * @return  Promise
+ */
+function consumeBody(body) {
+	var _this3 = this;
+
+	if (this[DISTURBED]) {
+		return Body.Promise.reject(new Error(`body used already for: ${this.url}`));
+	}
+
+	this[DISTURBED] = true;
+
+	// body is null
+	if (this.body === null) {
+		return Body.Promise.resolve(Buffer.alloc(0));
+	}
+
+	// body is string
+	if (typeof this.body === 'string') {
+		return Body.Promise.resolve(Buffer.from(this.body));
+	}
+
+	// body is blob
+	if (this.body instanceof Blob) {
+		return Body.Promise.resolve(this.body[BUFFER]);
+	}
+
+	// body is buffer
+	if (Buffer.isBuffer(this.body)) {
+		return Body.Promise.resolve(this.body);
+	}
+
+	// istanbul ignore if: should never happen
+	if (!(this.body instanceof Stream)) {
+		return Body.Promise.resolve(Buffer.alloc(0));
+	}
+
+	// body is stream
+	// get ready to actually consume the body
+	let accum = [];
+	let accumBytes = 0;
+	let abort = false;
+
+	return new Body.Promise(function (resolve, reject) {
+		let resTimeout;
+
+		// allow timeout on slow response body
+		if (_this3.timeout) {
+			resTimeout = setTimeout(function () {
+				abort = true;
+				reject(new FetchError(`Response timeout while trying to fetch ${_this3.url} (over ${_this3.timeout}ms)`, 'body-timeout'));
+			}, _this3.timeout);
+		}
+
+		// handle stream error, such as incorrect content-encoding
+		_this3.body.on('error', function (err) {
+			reject(new FetchError(`Invalid response body while trying to fetch ${_this3.url}: ${err.message}`, 'system', err));
+		});
+
+		_this3.body.on('data', function (chunk) {
+			if (abort || chunk === null) {
+				return;
+			}
+
+			if (_this3.size && accumBytes + chunk.length > _this3.size) {
+				abort = true;
+				reject(new FetchError(`content size at ${_this3.url} over limit: ${_this3.size}`, 'max-size'));
+				return;
+			}
+
+			accumBytes += chunk.length;
+			accum.push(chunk);
+		});
+
+		_this3.body.on('end', function () {
+			if (abort) {
+				return;
+			}
+
+			clearTimeout(resTimeout);
+			resolve(Buffer.concat(accum));
+		});
+	});
+}
+
+/**
+ * Detect buffer encoding and convert to target encoding
+ * ref: http://www.w3.org/TR/2011/WD-html5-20110113/parsing.html#determining-the-character-encoding
+ *
+ * @param   Buffer  buffer    Incoming buffer
+ * @param   String  encoding  Target encoding
+ * @return  String
+ */
+function convertBody(buffer, headers) {
+	if (typeof convert !== 'function') {
+		throw new Error('The package `encoding` must be installed to use the textConverted() function');
+	}
+
+	const ct = headers.get('content-type');
+	let charset = 'utf-8';
+	let res, str;
+
+	// header
+	if (ct) {
+		res = /charset=([^;]*)/i.exec(ct);
+	}
+
+	// no charset in content type, peek at response body for at most 1024 bytes
+	str = buffer.slice(0, 1024).toString();
+
+	// html5
+	if (!res && str) {
+		res = /<meta.+?charset=(['"])(.+?)\1/i.exec(str);
+	}
+
+	// html4
+	if (!res && str) {
+		res = /<meta[\s]+?http-equiv=(['"])content-type\1[\s]+?content=(['"])(.+?)\2/i.exec(str);
+
+		if (res) {
+			res = /charset=(.*)/i.exec(res.pop());
+		}
+	}
+
+	// xml
+	if (!res && str) {
+		res = /<\?xml.+?encoding=(['"])(.+?)\1/i.exec(str);
+	}
+
+	// found charset
+	if (res) {
+		charset = res.pop();
+
+		// prevent decode issues when sites use incorrect encoding
+		// ref: https://hsivonen.fi/encoding-menu/
+		if (charset === 'gb2312' || charset === 'gbk') {
+			charset = 'gb18030';
+		}
+	}
+
+	// turn raw buffers into a single utf-8 buffer
+	return convert(buffer, 'UTF-8', charset).toString();
+}
+
+/**
+ * Detect a URLSearchParams object
+ * ref: https://github.com/bitinn/node-fetch/issues/296#issuecomment-307598143
+ *
+ * @param   Object  obj     Object to detect by type or brand
+ * @return  String
+ */
+function isURLSearchParams(obj) {
+	// Duck-typing as a necessary condition.
+	if (typeof obj !== 'object' || typeof obj.append !== 'function' || typeof obj.delete !== 'function' || typeof obj.get !== 'function' || typeof obj.getAll !== 'function' || typeof obj.has !== 'function' || typeof obj.set !== 'function') {
+		return false;
+	}
+
+	// Brand-checking and more duck-typing as optional condition.
+	return obj.constructor.name === 'URLSearchParams' || Object.prototype.toString.call(obj) === '[object URLSearchParams]' || typeof obj.sort === 'function';
+}
+
+/**
+ * Clone body given Res/Req instance
+ *
+ * @param   Mixed  instance  Response or Request instance
+ * @return  Mixed
+ */
+function clone(instance) {
+	let p1, p2;
+	let body = instance.body;
+
+	// don't allow cloning a used body
+	if (instance.bodyUsed) {
+		throw new Error('cannot clone body after it is used');
+	}
+
+	// check that body is a stream and not form-data object
+	// note: we can't clone the form-data object without having it as a dependency
+	if (body instanceof Stream && typeof body.getBoundary !== 'function') {
+		// tee instance body
+		p1 = new PassThrough$1();
+		p2 = new PassThrough$1();
+		body.pipe(p1);
+		body.pipe(p2);
+		// set instance body to teed body and return the other teed body
+		instance.body = p1;
+		body = p2;
+	}
+
+	return body;
+}
+
+/**
+ * Performs the operation "extract a `Content-Type` value from |object|" as
+ * specified in the specification:
+ * https://fetch.spec.whatwg.org/#concept-bodyinit-extract
+ *
+ * This function assumes that instance.body is present and non-null.
+ *
+ * @param   Mixed  instance  Response or Request instance
+ */
+function extractContentType(instance) {
+	const body = instance.body;
+
+	// istanbul ignore if: Currently, because of a guard in Request, body
+	// can never be null. Included here for completeness.
+
+	if (body === null) {
+		// body is null
+		return null;
+	} else if (typeof body === 'string') {
+		// body is string
+		return 'text/plain;charset=UTF-8';
+	} else if (isURLSearchParams(body)) {
+		// body is a URLSearchParams
+		return 'application/x-www-form-urlencoded;charset=UTF-8';
+	} else if (body instanceof Blob) {
+		// body is blob
+		return body.type || null;
+	} else if (Buffer.isBuffer(body)) {
+		// body is buffer
+		return null;
+	} else if (typeof body.getBoundary === 'function') {
+		// detect form data input from form-data module
+		return `multipart/form-data;boundary=${body.getBoundary()}`;
+	} else {
+		// body is stream
+		// can't really do much about this
+		return null;
+	}
+}
+
+function getTotalBytes(instance) {
+	const body = instance.body;
+
+	// istanbul ignore if: included for completion
+
+	if (body === null) {
+		// body is null
+		return 0;
+	} else if (typeof body === 'string') {
+		// body is string
+		return Buffer.byteLength(body);
+	} else if (isURLSearchParams(body)) {
+		// body is URLSearchParams
+		return Buffer.byteLength(String(body));
+	} else if (body instanceof Blob) {
+		// body is blob
+		return body.size;
+	} else if (Buffer.isBuffer(body)) {
+		// body is buffer
+		return body.length;
+	} else if (body && typeof body.getLengthSync === 'function') {
+		// detect form data input from form-data module
+		if (body._lengthRetrievers && body._lengthRetrievers.length == 0 || // 1.x
+		body.hasKnownLength && body.hasKnownLength()) {
+			// 2.x
+			return body.getLengthSync();
+		}
+		return null;
+	} else {
+		// body is stream
+		// can't really do much about this
+		return null;
+	}
+}
+
+function writeToStream(dest, instance) {
+	const body = instance.body;
+
+
+	if (body === null) {
+		// body is null
+		dest.end();
+	} else if (typeof body === 'string') {
+		// body is string
+		dest.write(body);
+		dest.end();
+	} else if (isURLSearchParams(body)) {
+		// body is URLSearchParams
+		dest.write(Buffer.from(String(body)));
+		dest.end();
+	} else if (body instanceof Blob) {
+		// body is blob
+		dest.write(body[BUFFER]);
+		dest.end();
+	} else if (Buffer.isBuffer(body)) {
+		// body is buffer
+		dest.write(body);
+		dest.end();
+	} else {
+		// body is stream
+		body.pipe(dest);
+	}
+}
+
+// expose Promise
+Body.Promise = global.Promise;
+
+/**
+ * A set of utilities borrowed from Node.js' _http_common.js
+ */
+
+/**
+ * Verifies that the given val is a valid HTTP token
+ * per the rules defined in RFC 7230
+ * See https://tools.ietf.org/html/rfc7230#section-3.2.6
+ *
+ * Allowed characters in an HTTP token:
+ * ^_`a-z  94-122
+ * A-Z     65-90
+ * -       45
+ * 0-9     48-57
+ * !       33
+ * #$%&'   35-39
+ * *+      42-43
+ * .       46
+ * |       124
+ * ~       126
+ *
+ * This implementation of checkIsHttpToken() loops over the string instead of
+ * using a regular expression since the former is up to 180% faster with v8 4.9
+ * depending on the string length (the shorter the string, the larger the
+ * performance difference)
+ *
+ * Additionally, checkIsHttpToken() is currently designed to be inlinable by v8,
+ * so take care when making changes to the implementation so that the source
+ * code size does not exceed v8's default max_inlined_source_size setting.
+ **/
+/* istanbul ignore next */
+function isValidTokenChar(ch) {
+  if (ch >= 94 && ch <= 122) return true;
+  if (ch >= 65 && ch <= 90) return true;
+  if (ch === 45) return true;
+  if (ch >= 48 && ch <= 57) return true;
+  if (ch === 34 || ch === 40 || ch === 41 || ch === 44) return false;
+  if (ch >= 33 && ch <= 46) return true;
+  if (ch === 124 || ch === 126) return true;
+  return false;
+}
+/* istanbul ignore next */
+function checkIsHttpToken(val) {
+  if (typeof val !== 'string' || val.length === 0) return false;
+  if (!isValidTokenChar(val.charCodeAt(0))) return false;
+  const len = val.length;
+  if (len > 1) {
+    if (!isValidTokenChar(val.charCodeAt(1))) return false;
+    if (len > 2) {
+      if (!isValidTokenChar(val.charCodeAt(2))) return false;
+      if (len > 3) {
+        if (!isValidTokenChar(val.charCodeAt(3))) return false;
+        for (var i = 4; i < len; i++) {
+          if (!isValidTokenChar(val.charCodeAt(i))) return false;
+        }
+      }
+    }
+  }
+  return true;
+}
+/**
+ * True if val contains an invalid field-vchar
+ *  field-value    = *( field-content / obs-fold )
+ *  field-content  = field-vchar [ 1*( SP / HTAB ) field-vchar ]
+ *  field-vchar    = VCHAR / obs-text
+ *
+ * checkInvalidHeaderChar() is currently designed to be inlinable by v8,
+ * so take care when making changes to the implementation so that the source
+ * code size does not exceed v8's default max_inlined_source_size setting.
+ **/
+/* istanbul ignore next */
+function checkInvalidHeaderChar(val) {
+  val += '';
+  if (val.length < 1) return false;
+  var c = val.charCodeAt(0);
+  if (c <= 31 && c !== 9 || c > 255 || c === 127) return true;
+  if (val.length < 2) return false;
+  c = val.charCodeAt(1);
+  if (c <= 31 && c !== 9 || c > 255 || c === 127) return true;
+  if (val.length < 3) return false;
+  c = val.charCodeAt(2);
+  if (c <= 31 && c !== 9 || c > 255 || c === 127) return true;
+  for (var i = 3; i < val.length; ++i) {
+    c = val.charCodeAt(i);
+    if (c <= 31 && c !== 9 || c > 255 || c === 127) return true;
+  }
+  return false;
+}
+
+/**
+ * headers.js
+ *
+ * Headers class offers convenient helpers
+ */
+
+function sanitizeName(name) {
+	name += '';
+	if (!checkIsHttpToken(name)) {
+		throw new TypeError(`${name} is not a legal HTTP header name`);
+	}
+	return name.toLowerCase();
+}
+
+function sanitizeValue(value) {
+	value += '';
+	if (checkInvalidHeaderChar(value)) {
+		throw new TypeError(`${value} is not a legal HTTP header value`);
+	}
+	return value;
+}
+
+const MAP = Symbol('map');
+class Headers {
+	/**
+  * Headers class
+  *
+  * @param   Object  headers  Response headers
+  * @return  Void
+  */
+	constructor() {
+		let init = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : undefined;
+
+		this[MAP] = Object.create(null);
+
+		if (init instanceof Headers) {
+			const rawHeaders = init.raw();
+			const headerNames = Object.keys(rawHeaders);
+
+			for (const headerName of headerNames) {
+				for (const value of rawHeaders[headerName]) {
+					this.append(headerName, value);
+				}
+			}
+
+			return;
+		}
+
+		// We don't worry about converting prop to ByteString here as append()
+		// will handle it.
+		if (init == null) {
+			// no op
+		} else if (typeof init === 'object') {
+			const method = init[Symbol.iterator];
+			if (method != null) {
+				if (typeof method !== 'function') {
+					throw new TypeError('Header pairs must be iterable');
+				}
+
+				// sequence<sequence<ByteString>>
+				// Note: per spec we have to first exhaust the lists then process them
+				const pairs = [];
+				for (const pair of init) {
+					if (typeof pair !== 'object' || typeof pair[Symbol.iterator] !== 'function') {
+						throw new TypeError('Each header pair must be iterable');
+					}
+					pairs.push(Array.from(pair));
+				}
+
+				for (const pair of pairs) {
+					if (pair.length !== 2) {
+						throw new TypeError('Each header pair must be a name/value tuple');
+					}
+					this.append(pair[0], pair[1]);
+				}
+			} else {
+				// record<ByteString, ByteString>
+				for (const key of Object.keys(init)) {
+					const value = init[key];
+					this.append(key, value);
+				}
+			}
+		} else {
+			throw new TypeError('Provided initializer must be an object');
+		}
+
+		Object.defineProperty(this, Symbol.toStringTag, {
+			value: 'Headers',
+			writable: false,
+			enumerable: false,
+			configurable: true
+		});
+	}
+
+	/**
+  * Return first header value given name
+  *
+  * @param   String  name  Header name
+  * @return  Mixed
+  */
+	get(name) {
+		const list = this[MAP][sanitizeName(name)];
+		if (!list) {
+			return null;
+		}
+
+		return list.join(', ');
+	}
+
+	/**
+  * Iterate over all headers
+  *
+  * @param   Function  callback  Executed for each item with parameters (value, name, thisArg)
+  * @param   Boolean   thisArg   `this` context for callback function
+  * @return  Void
+  */
+	forEach(callback) {
+		let thisArg = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : undefined;
+
+		let pairs = getHeaderPairs(this);
+		let i = 0;
+		while (i < pairs.length) {
+			var _pairs$i = pairs[i];
+			const name = _pairs$i[0],
+			      value = _pairs$i[1];
+
+			callback.call(thisArg, value, name, this);
+			pairs = getHeaderPairs(this);
+			i++;
+		}
+	}
+
+	/**
+  * Overwrite header values given name
+  *
+  * @param   String  name   Header name
+  * @param   String  value  Header value
+  * @return  Void
+  */
+	set(name, value) {
+		this[MAP][sanitizeName(name)] = [sanitizeValue(value)];
+	}
+
+	/**
+  * Append a value onto existing header
+  *
+  * @param   String  name   Header name
+  * @param   String  value  Header value
+  * @return  Void
+  */
+	append(name, value) {
+		if (!this.has(name)) {
+			this.set(name, value);
+			return;
+		}
+
+		this[MAP][sanitizeName(name)].push(sanitizeValue(value));
+	}
+
+	/**
+  * Check for header name existence
+  *
+  * @param   String   name  Header name
+  * @return  Boolean
+  */
+	has(name) {
+		return !!this[MAP][sanitizeName(name)];
+	}
+
+	/**
+  * Delete all header values given name
+  *
+  * @param   String  name  Header name
+  * @return  Void
+  */
+	delete(name) {
+		delete this[MAP][sanitizeName(name)];
+	}
+
+	/**
+  * Return raw headers (non-spec api)
+  *
+  * @return  Object
+  */
+	raw() {
+		return this[MAP];
+	}
+
+	/**
+  * Get an iterator on keys.
+  *
+  * @return  Iterator
+  */
+	keys() {
+		return createHeadersIterator(this, 'key');
+	}
+
+	/**
+  * Get an iterator on values.
+  *
+  * @return  Iterator
+  */
+	values() {
+		return createHeadersIterator(this, 'value');
+	}
+
+	/**
+  * Get an iterator on entries.
+  *
+  * This is the default iterator of the Headers object.
+  *
+  * @return  Iterator
+  */
+	[Symbol.iterator]() {
+		return createHeadersIterator(this, 'key+value');
+	}
+}
+Headers.prototype.entries = Headers.prototype[Symbol.iterator];
+
+Object.defineProperty(Headers.prototype, Symbol.toStringTag, {
+	value: 'HeadersPrototype',
+	writable: false,
+	enumerable: false,
+	configurable: true
+});
+
+function getHeaderPairs(headers, kind) {
+	const keys = Object.keys(headers[MAP]).sort();
+	return keys.map(kind === 'key' ? function (k) {
+		return [k];
+	} : function (k) {
+		return [k, headers.get(k)];
+	});
+}
+
+const INTERNAL = Symbol('internal');
+
+function createHeadersIterator(target, kind) {
+	const iterator = Object.create(HeadersIteratorPrototype);
+	iterator[INTERNAL] = {
+		target,
+		kind,
+		index: 0
+	};
+	return iterator;
+}
+
+const HeadersIteratorPrototype = Object.setPrototypeOf({
+	next() {
+		// istanbul ignore if
+		if (!this || Object.getPrototypeOf(this) !== HeadersIteratorPrototype) {
+			throw new TypeError('Value of `this` is not a HeadersIterator');
+		}
+
+		var _INTERNAL = this[INTERNAL];
+		const target = _INTERNAL.target,
+		      kind = _INTERNAL.kind,
+		      index = _INTERNAL.index;
+
+		const values = getHeaderPairs(target, kind);
+		const len = values.length;
+		if (index >= len) {
+			return {
+				value: undefined,
+				done: true
+			};
+		}
+
+		const pair = values[index];
+		this[INTERNAL].index = index + 1;
+
+		let result;
+		if (kind === 'key') {
+			result = pair[0];
+		} else if (kind === 'value') {
+			result = pair[1];
+		} else {
+			result = pair;
+		}
+
+		return {
+			value: result,
+			done: false
+		};
+	}
+}, Object.getPrototypeOf(Object.getPrototypeOf([][Symbol.iterator]())));
+
+Object.defineProperty(HeadersIteratorPrototype, Symbol.toStringTag, {
+	value: 'HeadersIterator',
+	writable: false,
+	enumerable: false,
+	configurable: true
+});
+
+/**
+ * response.js
+ *
+ * Response class provides content decoding
+ */
+
+var _require$2 = require('http');
+
+const STATUS_CODES = _require$2.STATUS_CODES;
+
+/**
+ * Response class
+ *
+ * @param   Stream  body  Readable stream
+ * @param   Object  opts  Response options
+ * @return  Void
+ */
+
+class Response {
+	constructor() {
+		let body = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : null;
+		let opts = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
+
+		Body.call(this, body, opts);
+
+		this.url = opts.url;
+		this.status = opts.status || 200;
+		this.statusText = opts.statusText || STATUS_CODES[this.status];
+
+		this.headers = new Headers(opts.headers);
+
+		Object.defineProperty(this, Symbol.toStringTag, {
+			value: 'Response',
+			writable: false,
+			enumerable: false,
+			configurable: true
+		});
+	}
+
+	/**
+  * Convenience property representing if the request ended normally
+  */
+	get ok() {
+		return this.status >= 200 && this.status < 300;
+	}
+
+	/**
+  * Clone this response
+  *
+  * @return  Response
+  */
+	clone() {
+
+		return new Response(clone(this), {
+			url: this.url,
+			status: this.status,
+			statusText: this.statusText,
+			headers: this.headers,
+			ok: this.ok
+		});
+	}
+}
+
+Body.mixIn(Response.prototype);
+
+Object.defineProperty(Response.prototype, Symbol.toStringTag, {
+	value: 'ResponsePrototype',
+	writable: false,
+	enumerable: false,
+	configurable: true
+});
+
+/**
+ * request.js
+ *
+ * Request class contains server only options
+ */
+
+var _require$3 = require('url');
+
+const format_url = _require$3.format;
+const parse_url = _require$3.parse;
+
+
+const PARSED_URL = Symbol('url');
+
+/**
+ * Request class
+ *
+ * @param   Mixed   input  Url or Request instance
+ * @param   Object  init   Custom options
+ * @return  Void
+ */
+class Request {
+	constructor(input) {
+		let init = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
+
+		let parsedURL;
+
+		// normalize input
+		if (!(input instanceof Request)) {
+			if (input && input.href) {
+				// in order to support Node.js' Url objects; though WHATWG's URL objects
+				// will fall into this branch also (since their `toString()` will return
+				// `href` property anyway)
+				parsedURL = parse_url(input.href);
+			} else {
+				// coerce input to a string before attempting to parse
+				parsedURL = parse_url(`${input}`);
+			}
+			input = {};
+		} else {
+			parsedURL = parse_url(input.url);
+		}
+
+		let method = init.method || input.method || 'GET';
+
+		if ((init.body != null || input instanceof Request && input.body !== null) && (method === 'GET' || method === 'HEAD')) {
+			throw new TypeError('Request with GET/HEAD method cannot have body');
+		}
+
+		let inputBody = init.body != null ? init.body : input instanceof Request && input.body !== null ? clone(input) : null;
+
+		Body.call(this, inputBody, {
+			timeout: init.timeout || input.timeout || 0,
+			size: init.size || input.size || 0
+		});
+
+		// fetch spec options
+		this.method = method.toUpperCase();
+		this.redirect = init.redirect || input.redirect || 'follow';
+		this.headers = new Headers(init.headers || input.headers || {});
+
+		if (init.body != null) {
+			const contentType = extractContentType(this);
+			if (contentType !== null && !this.headers.has('Content-Type')) {
+				this.headers.append('Content-Type', contentType);
+			}
+		}
+
+		// server only options
+		this.follow = init.follow !== undefined ? init.follow : input.follow !== undefined ? input.follow : 20;
+		this.compress = init.compress !== undefined ? init.compress : input.compress !== undefined ? input.compress : true;
+		this.counter = init.counter || input.counter || 0;
+		this.agent = init.agent || input.agent;
+
+		this[PARSED_URL] = parsedURL;
+		Object.defineProperty(this, Symbol.toStringTag, {
+			value: 'Request',
+			writable: false,
+			enumerable: false,
+			configurable: true
+		});
+	}
+
+	get url() {
+		return format_url(this[PARSED_URL]);
+	}
+
+	/**
+  * Clone this request
+  *
+  * @return  Request
+  */
+	clone() {
+		return new Request(this);
+	}
+}
+
+Body.mixIn(Request.prototype);
+
+Object.defineProperty(Request.prototype, Symbol.toStringTag, {
+	value: 'RequestPrototype',
+	writable: false,
+	enumerable: false,
+	configurable: true
+});
+
+function getNodeRequestOptions(request) {
+	const parsedURL = request[PARSED_URL];
+	const headers = new Headers(request.headers);
+
+	// fetch step 3
+	if (!headers.has('Accept')) {
+		headers.set('Accept', '*/*');
+	}
+
+	// Basic fetch
+	if (!parsedURL.protocol || !parsedURL.hostname) {
+		throw new TypeError('Only absolute URLs are supported');
+	}
+
+	if (!/^https?:$/.test(parsedURL.protocol)) {
+		throw new TypeError('Only HTTP(S) protocols are supported');
+	}
+
+	// HTTP-network-or-cache fetch steps 5-9
+	let contentLengthValue = null;
+	if (request.body == null && /^(POST|PUT)$/i.test(request.method)) {
+		contentLengthValue = '0';
+	}
+	if (request.body != null) {
+		const totalBytes = getTotalBytes(request);
+		if (typeof totalBytes === 'number') {
+			contentLengthValue = String(totalBytes);
+		}
+	}
+	if (contentLengthValue) {
+		headers.set('Content-Length', contentLengthValue);
+	}
+
+	// HTTP-network-or-cache fetch step 12
+	if (!headers.has('User-Agent')) {
+		headers.set('User-Agent', 'node-fetch/1.0 (+https://github.com/bitinn/node-fetch)');
+	}
+
+	// HTTP-network-or-cache fetch step 16
+	if (request.compress) {
+		headers.set('Accept-Encoding', 'gzip,deflate');
+	}
+	if (!headers.has('Connection') && !request.agent) {
+		headers.set('Connection', 'close');
+	}
+
+	// HTTP-network fetch step 4
+	// chunked encoding is handled by Node.js
+
+	return Object.assign({}, parsedURL, {
+		method: request.method,
+		headers: headers.raw(),
+		agent: request.agent
+	});
+}
+
+/**
+ * index.js
+ *
+ * a request API compatible with window.fetch
+ */
+
+const http = require('http');
+const https = require('https');
+
+var _require = require('stream');
+
+const PassThrough = _require.PassThrough;
+
+var _require2 = require('url');
+
+const resolve_url = _require2.resolve;
+
+const zlib = require('zlib');
+
+/**
+ * Fetch function
+ *
+ * @param   Mixed    url   Absolute url or Request instance
+ * @param   Object   opts  Fetch options
+ * @return  Promise
+ */
+function fetch(url, opts) {
+
+	// allow custom promise
+	if (!fetch.Promise) {
+		throw new Error('native promise missing, set fetch.Promise to your favorite alternative');
+	}
+
+	Body.Promise = fetch.Promise;
+
+	// wrap http.request into fetch
+	return new fetch.Promise(function (resolve, reject) {
+		// build request object
+		const request = new Request(url, opts);
+		const options = getNodeRequestOptions(request);
+
+		const send = (options.protocol === 'https:' ? https : http).request;
+
+		// http.request only support string as host header, this hack make custom host header possible
+		if (options.headers.host) {
+			options.headers.host = options.headers.host[0];
+		}
+
+		// send request
+		const req = send(options);
+		let reqTimeout;
+
+		if (request.timeout) {
+			req.once('socket', function (socket) {
+				reqTimeout = setTimeout(function () {
+					req.abort();
+					reject(new FetchError(`network timeout at: ${request.url}`, 'request-timeout'));
+				}, request.timeout);
+			});
+		}
+
+		req.on('error', function (err) {
+			clearTimeout(reqTimeout);
+			reject(new FetchError(`request to ${request.url} failed, reason: ${err.message}`, 'system', err));
+		});
+
+		req.on('response', function (res) {
+			clearTimeout(reqTimeout);
+
+			// handle redirect
+			if (fetch.isRedirect(res.statusCode) && request.redirect !== 'manual') {
+				if (request.redirect === 'error') {
+					reject(new FetchError(`redirect mode is set to error: ${request.url}`, 'no-redirect'));
+					return;
+				}
+
+				if (request.counter >= request.follow) {
+					reject(new FetchError(`maximum redirect reached at: ${request.url}`, 'max-redirect'));
+					return;
+				}
+
+				if (!res.headers.location) {
+					reject(new FetchError(`redirect location header missing at: ${request.url}`, 'invalid-redirect'));
+					return;
+				}
+
+				// per fetch spec, for POST request with 301/302 response, or any request with 303 response, use GET when following redirect
+				if (res.statusCode === 303 || (res.statusCode === 301 || res.statusCode === 302) && request.method === 'POST') {
+					request.method = 'GET';
+					request.body = null;
+					request.headers.delete('content-length');
+				}
+
+				request.counter++;
+
+				resolve(fetch(resolve_url(request.url, res.headers.location), request));
+				return;
+			}
+
+			// normalize location header for manual redirect mode
+			const headers = new Headers();
+			for (const name of Object.keys(res.headers)) {
+				if (Array.isArray(res.headers[name])) {
+					for (const val of res.headers[name]) {
+						headers.append(name, val);
+					}
+				} else {
+					headers.append(name, res.headers[name]);
+				}
+			}
+			if (request.redirect === 'manual' && headers.has('location')) {
+				headers.set('location', resolve_url(request.url, headers.get('location')));
+			}
+
+			// prepare response
+			let body = res.pipe(new PassThrough());
+			const response_options = {
+				url: request.url,
+				status: res.statusCode,
+				statusText: res.statusMessage,
+				headers: headers,
+				size: request.size,
+				timeout: request.timeout
+			};
+
+			// HTTP-network fetch step 16.1.2
+			const codings = headers.get('Content-Encoding');
+
+			// HTTP-network fetch step 16.1.3: handle content codings
+
+			// in following scenarios we ignore compression support
+			// 1. compression support is disabled
+			// 2. HEAD request
+			// 3. no Content-Encoding header
+			// 4. no content response (204)
+			// 5. content not modified response (304)
+			if (!request.compress || request.method === 'HEAD' || codings === null || res.statusCode === 204 || res.statusCode === 304) {
+				resolve(new Response(body, response_options));
+				return;
+			}
+
+			// For Node v6+
+			// Be less strict when decoding compressed responses, since sometimes
+			// servers send slightly invalid responses that are still accepted
+			// by common browsers.
+			// Always using Z_SYNC_FLUSH is what cURL does.
+			const zlibOptions = {
+				flush: zlib.Z_SYNC_FLUSH,
+				finishFlush: zlib.Z_SYNC_FLUSH
+			};
+
+			// for gzip
+			if (codings == 'gzip' || codings == 'x-gzip') {
+				body = body.pipe(zlib.createGunzip(zlibOptions));
+				resolve(new Response(body, response_options));
+				return;
+			}
+
+			// for deflate
+			if (codings == 'deflate' || codings == 'x-deflate') {
+				// handle the infamous raw deflate response from old servers
+				// a hack for old IIS and Apache servers
+				const raw = res.pipe(new PassThrough());
+				raw.once('data', function (chunk) {
+					// see http://stackoverflow.com/questions/37519828
+					if ((chunk[0] & 0x0F) === 0x08) {
+						body = body.pipe(zlib.createInflate());
+					} else {
+						body = body.pipe(zlib.createInflateRaw());
+					}
+					resolve(new Response(body, response_options));
+				});
+				return;
+			}
+
+			// otherwise, use response as-is
+			resolve(new Response(body, response_options));
+		});
+
+		writeToStream(req, request);
+	});
+}
+
+/**
+ * Redirect code matching
+ *
+ * @param   Number   code  Status code
+ * @return  Boolean
+ */
+fetch.isRedirect = function (code) {
+	return code === 301 || code === 302 || code === 303 || code === 307 || code === 308;
+};
+
+// expose Promise
+fetch.Promise = global.Promise;
+
+module.exports = exports = fetch;
+exports.Headers = Headers;
+exports.Request = Request;
+exports.Response = Response;
+exports.FetchError = FetchError;
diff --git a/utilities/hash_script/node_modules/node-fetch/lib/request.js b/utilities/hash_script/node_modules/node-fetch/lib/request.js
new file mode 100644
index 0000000..1a29c29
--- /dev/null
+++ b/utilities/hash_script/node_modules/node-fetch/lib/request.js
@@ -0,0 +1,75 @@
+
+/**
+ * request.js
+ *
+ * Request class contains server only options
+ */
+
+var parse_url = require('url').parse;
+var Headers = require('./headers');
+var Body = require('./body');
+
+module.exports = Request;
+
+/**
+ * Request class
+ *
+ * @param   Mixed   input  Url or Request instance
+ * @param   Object  init   Custom options
+ * @return  Void
+ */
+function Request(input, init) {
+	var url, url_parsed;
+
+	// normalize input
+	if (!(input instanceof Request)) {
+		url = input;
+		url_parsed = parse_url(url);
+		input = {};
+	} else {
+		url = input.url;
+		url_parsed = parse_url(url);
+	}
+
+	// normalize init
+	init = init || {};
+
+	// fetch spec options
+	this.method = init.method || input.method || 'GET';
+	this.redirect = init.redirect || input.redirect || 'follow';
+	this.headers = new Headers(init.headers || input.headers || {});
+	this.url = url;
+
+	// server only options
+	this.follow = init.follow !== undefined ?
+		init.follow : input.follow !== undefined ?
+		input.follow : 20;
+	this.compress = init.compress !== undefined ?
+		init.compress : input.compress !== undefined ?
+		input.compress : true;
+	this.counter = init.counter || input.counter || 0;
+	this.agent = init.agent || input.agent;
+
+	Body.call(this, init.body || this._clone(input), {
+		timeout: init.timeout || input.timeout || 0,
+		size: init.size || input.size || 0
+	});
+
+	// server request options
+	this.protocol = url_parsed.protocol;
+	this.hostname = url_parsed.hostname;
+	this.port = url_parsed.port;
+	this.path = url_parsed.path;
+	this.auth = url_parsed.auth;
+}
+
+Request.prototype = Object.create(Body.prototype);
+
+/**
+ * Clone this request
+ *
+ * @return  Request
+ */
+Request.prototype.clone = function() {
+	return new Request(this);
+};
diff --git a/utilities/hash_script/node_modules/node-fetch/lib/response.js b/utilities/hash_script/node_modules/node-fetch/lib/response.js
new file mode 100644
index 0000000..f96aa85
--- /dev/null
+++ b/utilities/hash_script/node_modules/node-fetch/lib/response.js
@@ -0,0 +1,50 @@
+
+/**
+ * response.js
+ *
+ * Response class provides content decoding
+ */
+
+var http = require('http');
+var Headers = require('./headers');
+var Body = require('./body');
+
+module.exports = Response;
+
+/**
+ * Response class
+ *
+ * @param   Stream  body  Readable stream
+ * @param   Object  opts  Response options
+ * @return  Void
+ */
+function Response(body, opts) {
+
+	opts = opts || {};
+
+	this.url = opts.url;
+	this.status = opts.status || 200;
+	this.statusText = opts.statusText || http.STATUS_CODES[this.status];
+	this.headers = new Headers(opts.headers);
+	this.ok = this.status >= 200 && this.status < 300;
+
+	Body.call(this, body, opts);
+
+}
+
+Response.prototype = Object.create(Body.prototype);
+
+/**
+ * Clone this response
+ *
+ * @return  Response
+ */
+Response.prototype.clone = function() {
+	return new Response(this._clone(this), {
+		url: this.url
+		, status: this.status
+		, statusText: this.statusText
+		, headers: this.headers
+		, ok: this.ok
+	});
+};