(function(global, factory) {
  typeof exports === "object" && typeof module !== "undefined" ? factory(exports) : typeof define === "function" && define.amd ? define([ "exports" ], factory) : (global = typeof globalThis !== "undefined" ? globalThis : global || self, 
  factory(global.ActiveStorage = {}));
})(this, (function(exports) {
  "use strict";
  var sparkMd5 = {
    exports: {}
  };
  (function(module, exports) {
    (function(factory) {
      {
        module.exports = factory();
      }
    })((function(undefined$1) {
      var hex_chr = [ "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" ];
      function md5cycle(x, k) {
        var a = x[0], b = x[1], c = x[2], d = x[3];
        a += (b & c | ~b & d) + k[0] - 680876936 | 0;
        a = (a << 7 | a >>> 25) + b | 0;
        d += (a & b | ~a & c) + k[1] - 389564586 | 0;
        d = (d << 12 | d >>> 20) + a | 0;
        c += (d & a | ~d & b) + k[2] + 606105819 | 0;
        c = (c << 17 | c >>> 15) + d | 0;
        b += (c & d | ~c & a) + k[3] - 1044525330 | 0;
        b = (b << 22 | b >>> 10) + c | 0;
        a += (b & c | ~b & d) + k[4] - 176418897 | 0;
        a = (a << 7 | a >>> 25) + b | 0;
        d += (a & b | ~a & c) + k[5] + 1200080426 | 0;
        d = (d << 12 | d >>> 20) + a | 0;
        c += (d & a | ~d & b) + k[6] - 1473231341 | 0;
        c = (c << 17 | c >>> 15) + d | 0;
        b += (c & d | ~c & a) + k[7] - 45705983 | 0;
        b = (b << 22 | b >>> 10) + c | 0;
        a += (b & c | ~b & d) + k[8] + 1770035416 | 0;
        a = (a << 7 | a >>> 25) + b | 0;
        d += (a & b | ~a & c) + k[9] - 1958414417 | 0;
        d = (d << 12 | d >>> 20) + a | 0;
        c += (d & a | ~d & b) + k[10] - 42063 | 0;
        c = (c << 17 | c >>> 15) + d | 0;
        b += (c & d | ~c & a) + k[11] - 1990404162 | 0;
        b = (b << 22 | b >>> 10) + c | 0;
        a += (b & c | ~b & d) + k[12] + 1804603682 | 0;
        a = (a << 7 | a >>> 25) + b | 0;
        d += (a & b | ~a & c) + k[13] - 40341101 | 0;
        d = (d << 12 | d >>> 20) + a | 0;
        c += (d & a | ~d & b) + k[14] - 1502002290 | 0;
        c = (c << 17 | c >>> 15) + d | 0;
        b += (c & d | ~c & a) + k[15] + 1236535329 | 0;
        b = (b << 22 | b >>> 10) + c | 0;
        a += (b & d | c & ~d) + k[1] - 165796510 | 0;
        a = (a << 5 | a >>> 27) + b | 0;
        d += (a & c | b & ~c) + k[6] - 1069501632 | 0;
        d = (d << 9 | d >>> 23) + a | 0;
        c += (d & b | a & ~b) + k[11] + 643717713 | 0;
        c = (c << 14 | c >>> 18) + d | 0;
        b += (c & a | d & ~a) + k[0] - 373897302 | 0;
        b = (b << 20 | b >>> 12) + c | 0;
        a += (b & d | c & ~d) + k[5] - 701558691 | 0;
        a = (a << 5 | a >>> 27) + b | 0;
        d += (a & c | b & ~c) + k[10] + 38016083 | 0;
        d = (d << 9 | d >>> 23) + a | 0;
        c += (d & b | a & ~b) + k[15] - 660478335 | 0;
        c = (c << 14 | c >>> 18) + d | 0;
        b += (c & a | d & ~a) + k[4] - 405537848 | 0;
        b = (b << 20 | b >>> 12) + c | 0;
        a += (b & d | c & ~d) + k[9] + 568446438 | 0;
        a = (a << 5 | a >>> 27) + b | 0;
        d += (a & c | b & ~c) + k[14] - 1019803690 | 0;
        d = (d << 9 | d >>> 23) + a | 0;
        c += (d & b | a & ~b) + k[3] - 187363961 | 0;
        c = (c << 14 | c >>> 18) + d | 0;
        b += (c & a | d & ~a) + k[8] + 1163531501 | 0;
        b = (b << 20 | b >>> 12) + c | 0;
        a += (b & d | c & ~d) + k[13] - 1444681467 | 0;
        a = (a << 5 | a >>> 27) + b | 0;
        d += (a & c | b & ~c) + k[2] - 51403784 | 0;
        d = (d << 9 | d >>> 23) + a | 0;
        c += (d & b | a & ~b) + k[7] + 1735328473 | 0;
        c = (c << 14 | c >>> 18) + d | 0;
        b += (c & a | d & ~a) + k[12] - 1926607734 | 0;
        b = (b << 20 | b >>> 12) + c | 0;
        a += (b ^ c ^ d) + k[5] - 378558 | 0;
        a = (a << 4 | a >>> 28) + b | 0;
        d += (a ^ b ^ c) + k[8] - 2022574463 | 0;
        d = (d << 11 | d >>> 21) + a | 0;
        c += (d ^ a ^ b) + k[11] + 1839030562 | 0;
        c = (c << 16 | c >>> 16) + d | 0;
        b += (c ^ d ^ a) + k[14] - 35309556 | 0;
        b = (b << 23 | b >>> 9) + c | 0;
        a += (b ^ c ^ d) + k[1] - 1530992060 | 0;
        a = (a << 4 | a >>> 28) + b | 0;
        d += (a ^ b ^ c) + k[4] + 1272893353 | 0;
        d = (d << 11 | d >>> 21) + a | 0;
        c += (d ^ a ^ b) + k[7] - 155497632 | 0;
        c = (c << 16 | c >>> 16) + d | 0;
        b += (c ^ d ^ a) + k[10] - 1094730640 | 0;
        b = (b << 23 | b >>> 9) + c | 0;
        a += (b ^ c ^ d) + k[13] + 681279174 | 0;
        a = (a << 4 | a >>> 28) + b | 0;
        d += (a ^ b ^ c) + k[0] - 358537222 | 0;
        d = (d << 11 | d >>> 21) + a | 0;
        c += (d ^ a ^ b) + k[3] - 722521979 | 0;
        c = (c << 16 | c >>> 16) + d | 0;
        b += (c ^ d ^ a) + k[6] + 76029189 | 0;
        b = (b << 23 | b >>> 9) + c | 0;
        a += (b ^ c ^ d) + k[9] - 640364487 | 0;
        a = (a << 4 | a >>> 28) + b | 0;
        d += (a ^ b ^ c) + k[12] - 421815835 | 0;
        d = (d << 11 | d >>> 21) + a | 0;
        c += (d ^ a ^ b) + k[15] + 530742520 | 0;
        c = (c << 16 | c >>> 16) + d | 0;
        b += (c ^ d ^ a) + k[2] - 995338651 | 0;
        b = (b << 23 | b >>> 9) + c | 0;
        a += (c ^ (b | ~d)) + k[0] - 198630844 | 0;
        a = (a << 6 | a >>> 26) + b | 0;
        d += (b ^ (a | ~c)) + k[7] + 1126891415 | 0;
        d = (d << 10 | d >>> 22) + a | 0;
        c += (a ^ (d | ~b)) + k[14] - 1416354905 | 0;
        c = (c << 15 | c >>> 17) + d | 0;
        b += (d ^ (c | ~a)) + k[5] - 57434055 | 0;
        b = (b << 21 | b >>> 11) + c | 0;
        a += (c ^ (b | ~d)) + k[12] + 1700485571 | 0;
        a = (a << 6 | a >>> 26) + b | 0;
        d += (b ^ (a | ~c)) + k[3] - 1894986606 | 0;
        d = (d << 10 | d >>> 22) + a | 0;
        c += (a ^ (d | ~b)) + k[10] - 1051523 | 0;
        c = (c << 15 | c >>> 17) + d | 0;
        b += (d ^ (c | ~a)) + k[1] - 2054922799 | 0;
        b = (b << 21 | b >>> 11) + c | 0;
        a += (c ^ (b | ~d)) + k[8] + 1873313359 | 0;
        a = (a << 6 | a >>> 26) + b | 0;
        d += (b ^ (a | ~c)) + k[15] - 30611744 | 0;
        d = (d << 10 | d >>> 22) + a | 0;
        c += (a ^ (d | ~b)) + k[6] - 1560198380 | 0;
        c = (c << 15 | c >>> 17) + d | 0;
        b += (d ^ (c | ~a)) + k[13] + 1309151649 | 0;
        b = (b << 21 | b >>> 11) + c | 0;
        a += (c ^ (b | ~d)) + k[4] - 145523070 | 0;
        a = (a << 6 | a >>> 26) + b | 0;
        d += (b ^ (a | ~c)) + k[11] - 1120210379 | 0;
        d = (d << 10 | d >>> 22) + a | 0;
        c += (a ^ (d | ~b)) + k[2] + 718787259 | 0;
        c = (c << 15 | c >>> 17) + d | 0;
        b += (d ^ (c | ~a)) + k[9] - 343485551 | 0;
        b = (b << 21 | b >>> 11) + c | 0;
        x[0] = a + x[0] | 0;
        x[1] = b + x[1] | 0;
        x[2] = c + x[2] | 0;
        x[3] = d + x[3] | 0;
      }
      function md5blk(s) {
        var md5blks = [], i;
        for (i = 0; i < 64; i += 4) {
          md5blks[i >> 2] = s.charCodeAt(i) + (s.charCodeAt(i + 1) << 8) + (s.charCodeAt(i + 2) << 16) + (s.charCodeAt(i + 3) << 24);
        }
        return md5blks;
      }
      function md5blk_array(a) {
        var md5blks = [], i;
        for (i = 0; i < 64; i += 4) {
          md5blks[i >> 2] = a[i] + (a[i + 1] << 8) + (a[i + 2] << 16) + (a[i + 3] << 24);
        }
        return md5blks;
      }
      function md51(s) {
        var n = s.length, state = [ 1732584193, -271733879, -1732584194, 271733878 ], i, length, tail, tmp, lo, hi;
        for (i = 64; i <= n; i += 64) {
          md5cycle(state, md5blk(s.substring(i - 64, i)));
        }
        s = s.substring(i - 64);
        length = s.length;
        tail = [ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ];
        for (i = 0; i < length; i += 1) {
          tail[i >> 2] |= s.charCodeAt(i) << (i % 4 << 3);
        }
        tail[i >> 2] |= 128 << (i % 4 << 3);
        if (i > 55) {
          md5cycle(state, tail);
          for (i = 0; i < 16; i += 1) {
            tail[i] = 0;
          }
        }
        tmp = n * 8;
        tmp = tmp.toString(16).match(/(.*?)(.{0,8})$/);
        lo = parseInt(tmp[2], 16);
        hi = parseInt(tmp[1], 16) || 0;
        tail[14] = lo;
        tail[15] = hi;
        md5cycle(state, tail);
        return state;
      }
      function md51_array(a) {
        var n = a.length, state = [ 1732584193, -271733879, -1732584194, 271733878 ], i, length, tail, tmp, lo, hi;
        for (i = 64; i <= n; i += 64) {
          md5cycle(state, md5blk_array(a.subarray(i - 64, i)));
        }
        a = i - 64 < n ? a.subarray(i - 64) : new Uint8Array(0);
        length = a.length;
        tail = [ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ];
        for (i = 0; i < length; i += 1) {
          tail[i >> 2] |= a[i] << (i % 4 << 3);
        }
        tail[i >> 2] |= 128 << (i % 4 << 3);
        if (i > 55) {
          md5cycle(state, tail);
          for (i = 0; i < 16; i += 1) {
            tail[i] = 0;
          }
        }
        tmp = n * 8;
        tmp = tmp.toString(16).match(/(.*?)(.{0,8})$/);
        lo = parseInt(tmp[2], 16);
        hi = parseInt(tmp[1], 16) || 0;
        tail[14] = lo;
        tail[15] = hi;
        md5cycle(state, tail);
        return state;
      }
      function rhex(n) {
        var s = "", j;
        for (j = 0; j < 4; j += 1) {
          s += hex_chr[n >> j * 8 + 4 & 15] + hex_chr[n >> j * 8 & 15];
        }
        return s;
      }
      function hex(x) {
        var i;
        for (i = 0; i < x.length; i += 1) {
          x[i] = rhex(x[i]);
        }
        return x.join("");
      }
      if (hex(md51("hello")) !== "5d41402abc4b2a76b9719d911017c592") ;
      if (typeof ArrayBuffer !== "undefined" && !ArrayBuffer.prototype.slice) {
        (function() {
          function clamp(val, length) {
            val = val | 0 || 0;
            if (val < 0) {
              return Math.max(val + length, 0);
            }
            return Math.min(val, length);
          }
          ArrayBuffer.prototype.slice = function(from, to) {
            var length = this.byteLength, begin = clamp(from, length), end = length, num, target, targetArray, sourceArray;
            if (to !== undefined$1) {
              end = clamp(to, length);
            }
            if (begin > end) {
              return new ArrayBuffer(0);
            }
            num = end - begin;
            target = new ArrayBuffer(num);
            targetArray = new Uint8Array(target);
            sourceArray = new Uint8Array(this, begin, num);
            targetArray.set(sourceArray);
            return target;
          };
        })();
      }
      function toUtf8(str) {
        if (/[\u0080-\uFFFF]/.test(str)) {
          str = unescape(encodeURIComponent(str));
        }
        return str;
      }
      function utf8Str2ArrayBuffer(str, returnUInt8Array) {
        var length = str.length, buff = new ArrayBuffer(length), arr = new Uint8Array(buff), i;
        for (i = 0; i < length; i += 1) {
          arr[i] = str.charCodeAt(i);
        }
        return returnUInt8Array ? arr : buff;
      }
      function arrayBuffer2Utf8Str(buff) {
        return String.fromCharCode.apply(null, new Uint8Array(buff));
      }
      function concatenateArrayBuffers(first, second, returnUInt8Array) {
        var result = new Uint8Array(first.byteLength + second.byteLength);
        result.set(new Uint8Array(first));
        result.set(new Uint8Array(second), first.byteLength);
        return returnUInt8Array ? result : result.buffer;
      }
      function hexToBinaryString(hex) {
        var bytes = [], length = hex.length, x;
        for (x = 0; x < length - 1; x += 2) {
          bytes.push(parseInt(hex.substr(x, 2), 16));
        }
        return String.fromCharCode.apply(String, bytes);
      }
      function SparkMD5() {
        this.reset();
      }
      SparkMD5.prototype.append = function(str) {
        this.appendBinary(toUtf8(str));
        return this;
      };
      SparkMD5.prototype.appendBinary = function(contents) {
        this._buff += contents;
        this._length += contents.length;
        var length = this._buff.length, i;
        for (i = 64; i <= length; i += 64) {
          md5cycle(this._hash, md5blk(this._buff.substring(i - 64, i)));
        }
        this._buff = this._buff.substring(i - 64);
        return this;
      };
      SparkMD5.prototype.end = function(raw) {
        var buff = this._buff, length = buff.length, i, tail = [ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ], ret;
        for (i = 0; i < length; i += 1) {
          tail[i >> 2] |= buff.charCodeAt(i) << (i % 4 << 3);
        }
        this._finish(tail, length);
        ret = hex(this._hash);
        if (raw) {
          ret = hexToBinaryString(ret);
        }
        this.reset();
        return ret;
      };
      SparkMD5.prototype.reset = function() {
        this._buff = "";
        this._length = 0;
        this._hash = [ 1732584193, -271733879, -1732584194, 271733878 ];
        return this;
      };
      SparkMD5.prototype.getState = function() {
        return {
          buff: this._buff,
          length: this._length,
          hash: this._hash.slice()
        };
      };
      SparkMD5.prototype.setState = function(state) {
        this._buff = state.buff;
        this._length = state.length;
        this._hash = state.hash;
        return this;
      };
      SparkMD5.prototype.destroy = function() {
        delete this._hash;
        delete this._buff;
        delete this._length;
      };
      SparkMD5.prototype._finish = function(tail, length) {
        var i = length, tmp, lo, hi;
        tail[i >> 2] |= 128 << (i % 4 << 3);
        if (i > 55) {
          md5cycle(this._hash, tail);
          for (i = 0; i < 16; i += 1) {
            tail[i] = 0;
          }
        }
        tmp = this._length * 8;
        tmp = tmp.toString(16).match(/(.*?)(.{0,8})$/);
        lo = parseInt(tmp[2], 16);
        hi = parseInt(tmp[1], 16) || 0;
        tail[14] = lo;
        tail[15] = hi;
        md5cycle(this._hash, tail);
      };
      SparkMD5.hash = function(str, raw) {
        return SparkMD5.hashBinary(toUtf8(str), raw);
      };
      SparkMD5.hashBinary = function(content, raw) {
        var hash = md51(content), ret = hex(hash);
        return raw ? hexToBinaryString(ret) : ret;
      };
      SparkMD5.ArrayBuffer = function() {
        this.reset();
      };
      SparkMD5.ArrayBuffer.prototype.append = function(arr) {
        var buff = concatenateArrayBuffers(this._buff.buffer, arr, true), length = buff.length, i;
        this._length += arr.byteLength;
        for (i = 64; i <= length; i += 64) {
          md5cycle(this._hash, md5blk_array(buff.subarray(i - 64, i)));
        }
        this._buff = i - 64 < length ? new Uint8Array(buff.buffer.slice(i - 64)) : new Uint8Array(0);
        return this;
      };
      SparkMD5.ArrayBuffer.prototype.end = function(raw) {
        var buff = this._buff, length = buff.length, tail = [ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ], i, ret;
        for (i = 0; i < length; i += 1) {
          tail[i >> 2] |= buff[i] << (i % 4 << 3);
        }
        this._finish(tail, length);
        ret = hex(this._hash);
        if (raw) {
          ret = hexToBinaryString(ret);
        }
        this.reset();
        return ret;
      };
      SparkMD5.ArrayBuffer.prototype.reset = function() {
        this._buff = new Uint8Array(0);
        this._length = 0;
        this._hash = [ 1732584193, -271733879, -1732584194, 271733878 ];
        return this;
      };
      SparkMD5.ArrayBuffer.prototype.getState = function() {
        var state = SparkMD5.prototype.getState.call(this);
        state.buff = arrayBuffer2Utf8Str(state.buff);
        return state;
      };
      SparkMD5.ArrayBuffer.prototype.setState = function(state) {
        state.buff = utf8Str2ArrayBuffer(state.buff, true);
        return SparkMD5.prototype.setState.call(this, state);
      };
      SparkMD5.ArrayBuffer.prototype.destroy = SparkMD5.prototype.destroy;
      SparkMD5.ArrayBuffer.prototype._finish = SparkMD5.prototype._finish;
      SparkMD5.ArrayBuffer.hash = function(arr, raw) {
        var hash = md51_array(new Uint8Array(arr)), ret = hex(hash);
        return raw ? hexToBinaryString(ret) : ret;
      };
      return SparkMD5;
    }));
  })(sparkMd5);
  var SparkMD5 = sparkMd5.exports;
  const fileSlice = File.prototype.slice || File.prototype.mozSlice || File.prototype.webkitSlice;
  class FileChecksum {
    static create(file, callback) {
      const instance = new FileChecksum(file);
      instance.create(callback);
    }
    constructor(file) {
      this.file = file;
      this.chunkSize = 2097152;
      this.chunkCount = Math.ceil(this.file.size / this.chunkSize);
      this.chunkIndex = 0;
    }
    create(callback) {
      this.callback = callback;
      this.md5Buffer = new SparkMD5.ArrayBuffer;
      this.fileReader = new FileReader;
      this.fileReader.addEventListener("load", (event => this.fileReaderDidLoad(event)));
      this.fileReader.addEventListener("error", (event => this.fileReaderDidError(event)));
      this.readNextChunk();
    }
    fileReaderDidLoad(event) {
      this.md5Buffer.append(event.target.result);
      if (!this.readNextChunk()) {
        const binaryDigest = this.md5Buffer.end(true);
        const base64digest = btoa(binaryDigest);
        this.callback(null, base64digest);
      }
    }
    fileReaderDidError(event) {
      this.callback(`Error reading ${this.file.name}`);
    }
    readNextChunk() {
      if (this.chunkIndex < this.chunkCount || this.chunkIndex == 0 && this.chunkCount == 0) {
        const start = this.chunkIndex * this.chunkSize;
        const end = Math.min(start + this.chunkSize, this.file.size);
        const bytes = fileSlice.call(this.file, start, end);
        this.fileReader.readAsArrayBuffer(bytes);
        this.chunkIndex++;
        return true;
      } else {
        return false;
      }
    }
  }
  function getMetaValue(name) {
    const element = findElement(document.head, `meta[name="${name}"]`);
    if (element) {
      return element.getAttribute("content");
    }
  }
  function findElements(root, selector) {
    if (typeof root == "string") {
      selector = root;
      root = document;
    }
    const elements = root.querySelectorAll(selector);
    return toArray(elements);
  }
  function findElement(root, selector) {
    if (typeof root == "string") {
      selector = root;
      root = document;
    }
    return root.querySelector(selector);
  }
  function dispatchEvent(element, type, eventInit = {}) {
    const {disabled: disabled} = element;
    const {bubbles: bubbles, cancelable: cancelable, detail: detail} = eventInit;
    const event = document.createEvent("Event");
    event.initEvent(type, bubbles || true, cancelable || true);
    event.detail = detail || {};
    try {
      element.disabled = false;
      element.dispatchEvent(event);
    } finally {
      element.disabled = disabled;
    }
    return event;
  }
  function toArray(value) {
    if (Array.isArray(value)) {
      return value;
    } else if (Array.from) {
      return Array.from(value);
    } else {
      return [].slice.call(value);
    }
  }
  class BlobRecord {
    constructor(file, checksum, url, customHeaders = {}) {
      this.file = file;
      this.attributes = {
        filename: file.name,
        content_type: file.type || "application/octet-stream",
        byte_size: file.size,
        checksum: checksum
      };
      this.xhr = new XMLHttpRequest;
      this.xhr.open("POST", url, true);
      this.xhr.responseType = "json";
      this.xhr.setRequestHeader("Content-Type", "application/json");
      this.xhr.setRequestHeader("Accept", "application/json");
      this.xhr.setRequestHeader("X-Requested-With", "XMLHttpRequest");
      Object.keys(customHeaders).forEach((headerKey => {
        this.xhr.setRequestHeader(headerKey, customHeaders[headerKey]);
      }));
      const csrfToken = getMetaValue("csrf-token");
      if (csrfToken != undefined) {
        this.xhr.setRequestHeader("X-CSRF-Token", csrfToken);
      }
      this.xhr.addEventListener("load", (event => this.requestDidLoad(event)));
      this.xhr.addEventListener("error", (event => this.requestDidError(event)));
    }
    get status() {
      return this.xhr.status;
    }
    get response() {
      const {responseType: responseType, response: response} = this.xhr;
      if (responseType == "json") {
        return response;
      } else {
        return JSON.parse(response);
      }
    }
    create(callback) {
      this.callback = callback;
      this.xhr.send(JSON.stringify({
        blob: this.attributes
      }));
    }
    requestDidLoad(event) {
      if (this.status >= 200 && this.status < 300) {
        const {response: response} = this;
        const {direct_upload: direct_upload} = response;
        delete response.direct_upload;
        this.attributes = response;
        this.directUploadData = direct_upload;
        this.callback(null, this.toJSON());
      } else {
        this.requestDidError(event);
      }
    }
    requestDidError(event) {
      this.callback(`Error creating Blob for "${this.file.name}". Status: ${this.status}`);
    }
    toJSON() {
      const result = {};
      for (const key in this.attributes) {
        result[key] = this.attributes[key];
      }
      return result;
    }
  }
  class BlobUpload {
    constructor(blob) {
      this.blob = blob;
      this.file = blob.file;
      const {url: url, headers: headers} = blob.directUploadData;
      this.xhr = new XMLHttpRequest;
      this.xhr.open("PUT", url, true);
      this.xhr.responseType = "text";
      for (const key in headers) {
        this.xhr.setRequestHeader(key, headers[key]);
      }
      this.xhr.addEventListener("load", (event => this.requestDidLoad(event)));
      this.xhr.addEventListener("error", (event => this.requestDidError(event)));
    }
    create(callback) {
      this.callback = callback;
      this.xhr.send(this.file.slice());
    }
    requestDidLoad(event) {
      const {status: status, response: response} = this.xhr;
      if (status >= 200 && status < 300) {
        this.callback(null, response);
      } else {
        this.requestDidError(event);
      }
    }
    requestDidError(event) {
      this.callback(`Error storing "${this.file.name}". Status: ${this.xhr.status}`);
    }
  }
  let id = 0;
  class DirectUpload {
    constructor(file, url, delegate, customHeaders = {}) {
      this.id = ++id;
      this.file = file;
      this.url = url;
      this.delegate = delegate;
      this.customHeaders = customHeaders;
    }
    create(callback) {
      FileChecksum.create(this.file, ((error, checksum) => {
        if (error) {
          callback(error);
          return;
        }
        const blob = new BlobRecord(this.file, checksum, this.url, this.customHeaders);
        notify(this.delegate, "directUploadWillCreateBlobWithXHR", blob.xhr);
        blob.create((error => {
          if (error) {
            callback(error);
          } else {
            const upload = new BlobUpload(blob);
            notify(this.delegate, "directUploadWillStoreFileWithXHR", upload.xhr);
            upload.create((error => {
              if (error) {
                callback(error);
              } else {
                callback(null, blob.toJSON());
              }
            }));
          }
        }));
      }));
    }
  }
  function notify(object, methodName, ...messages) {
    if (object && typeof object[methodName] == "function") {
      return object[methodName](...messages);
    }
  }
  class DirectUploadController {
    constructor(input, file) {
      this.input = input;
      this.file = file;
      this.directUpload = new DirectUpload(this.file, this.url, this);
      this.dispatch("initialize");
    }
    start(callback) {
      const hiddenInput = document.createElement("input");
      hiddenInput.type = "hidden";
      hiddenInput.name = this.input.name;
      this.input.insertAdjacentElement("beforebegin", hiddenInput);
      this.dispatch("start");
      this.directUpload.create(((error, attributes) => {
        if (error) {
          hiddenInput.parentNode.removeChild(hiddenInput);
          this.dispatchError(error);
        } else {
          hiddenInput.value = attributes.signed_id;
        }
        this.dispatch("end");
        callback(error);
      }));
    }
    uploadRequestDidProgress(event) {
      const progress = event.loaded / event.total * 100;
      if (progress) {
        this.dispatch("progress", {
          progress: progress
        });
      }
    }
    get url() {
      return this.input.getAttribute("data-direct-upload-url");
    }
    dispatch(name, detail = {}) {
      detail.file = this.file;
      detail.id = this.directUpload.id;
      return dispatchEvent(this.input, `direct-upload:${name}`, {
        detail: detail
      });
    }
    dispatchError(error) {
      const event = this.dispatch("error", {
        error: error
      });
      if (!event.defaultPrevented) {
        alert(error);
      }
    }
    directUploadWillCreateBlobWithXHR(xhr) {
      this.dispatch("before-blob-request", {
        xhr: xhr
      });
    }
    directUploadWillStoreFileWithXHR(xhr) {
      this.dispatch("before-storage-request", {
        xhr: xhr
      });
      xhr.upload.addEventListener("progress", (event => this.uploadRequestDidProgress(event)));
    }
  }
  const inputSelector = "input[type=file][data-direct-upload-url]:not([disabled])";
  class DirectUploadsController {
    constructor(form) {
      this.form = form;
      this.inputs = findElements(form, inputSelector).filter((input => input.files.length));
    }
    start(callback) {
      const controllers = this.createDirectUploadControllers();
      const startNextController = () => {
        const controller = controllers.shift();
        if (controller) {
          controller.start((error => {
            if (error) {
              callback(error);
              this.dispatch("end");
            } else {
              startNextController();
            }
          }));
        } else {
          callback();
          this.dispatch("end");
        }
      };
      this.dispatch("start");
      startNextController();
    }
    createDirectUploadControllers() {
      const controllers = [];
      this.inputs.forEach((input => {
        toArray(input.files).forEach((file => {
          const controller = new DirectUploadController(input, file);
          controllers.push(controller);
        }));
      }));
      return controllers;
    }
    dispatch(name, detail = {}) {
      return dispatchEvent(this.form, `direct-uploads:${name}`, {
        detail: detail
      });
    }
  }
  const processingAttribute = "data-direct-uploads-processing";
  const submitButtonsByForm = new WeakMap;
  let started = false;
  function start() {
    if (!started) {
      started = true;
      document.addEventListener("click", didClick, true);
      document.addEventListener("submit", didSubmitForm, true);
      document.addEventListener("ajax:before", didSubmitRemoteElement);
    }
  }
  function didClick(event) {
    const button = event.target.closest("button, input");
    if (button && button.type === "submit" && button.form) {
      submitButtonsByForm.set(button.form, button);
    }
  }
  function didSubmitForm(event) {
    handleFormSubmissionEvent(event);
  }
  function didSubmitRemoteElement(event) {
    if (event.target.tagName == "FORM") {
      handleFormSubmissionEvent(event);
    }
  }
  function handleFormSubmissionEvent(event) {
    const form = event.target;
    if (form.hasAttribute(processingAttribute)) {
      event.preventDefault();
      return;
    }
    const controller = new DirectUploadsController(form);
    const {inputs: inputs} = controller;
    if (inputs.length) {
      event.preventDefault();
      form.setAttribute(processingAttribute, "");
      inputs.forEach(disable);
      controller.start((error => {
        form.removeAttribute(processingAttribute);
        if (error) {
          inputs.forEach(enable);
        } else {
          submitForm(form);
        }
      }));
    }
  }
  function submitForm(form) {
    let button = submitButtonsByForm.get(form) || findElement(form, "input[type=submit], button[type=submit]");
    if (button) {
      const {disabled: disabled} = button;
      button.disabled = false;
      button.focus();
      button.click();
      button.disabled = disabled;
    } else {
      button = document.createElement("input");
      button.type = "submit";
      button.style.display = "none";
      form.appendChild(button);
      button.click();
      form.removeChild(button);
    }
    submitButtonsByForm.delete(form);
  }
  function disable(input) {
    input.disabled = true;
  }
  function enable(input) {
    input.disabled = false;
  }
  function autostart() {
    if (window.ActiveStorage) {
      start();
    }
  }
  setTimeout(autostart, 1);
  exports.DirectUpload = DirectUpload;
  exports.DirectUploadController = DirectUploadController;
  exports.DirectUploadsController = DirectUploadsController;
  exports.dispatchEvent = dispatchEvent;
  exports.start = start;
  Object.defineProperty(exports, "__esModule", {
    value: true
  });
}));
