Implemented multi-file upload/download

app/api.js

@@ -1,4 +1,5 @@
 import { arrayToB64, b64ToArray, delay } from './utils';
+import { ECE_RECORD_SIZE } from './ece';
 
 function post(obj) {
   return {
@@ -78,7 +79,8 @@ export async function metadata(id, keychain) {
       ttl: data.ttl,
       iv: meta.iv,
       name: meta.name,
-      type: meta.type
+      type: meta.type,
+      manifest: meta.manifest
     };
   }
   throw new Error(result.response.status);
@@ -126,14 +128,7 @@ function listenForResponse(ws, canceller) {
   });
 }
 
-async function upload(
+async function upload(stream, metadata, verifierB64, onprogress, canceller) {
-  stream,
-  streamInfo,
-  metadata,
-  verifierB64,
-  onprogress,
-  canceller
-) {
   const host = window.location.hostname;
   const port = window.location.port;
   const protocol = window.location.protocol === 'https:' ? 'wss:' : 'ws:';
@@ -166,10 +161,10 @@ async function upload(
 
       ws.send(buf);
 
-      onprogress([size, streamInfo.fileSize]);
+      onprogress(size);
       size += buf.length;
       state = await reader.read();
-      while (ws.bufferedAmount > streamInfo.recordSize * 2) {
+      while (ws.bufferedAmount > ECE_RECORD_SIZE * 2) {
         await delay();
       }
     }
@@ -185,7 +180,7 @@ async function upload(
   }
 }
 
-export function uploadWs(encrypted, info, metadata, verifierB64, onprogress) {
+export function uploadWs(encrypted, metadata, verifierB64, onprogress) {
   const canceller = { cancelled: false };
 
   return {
@@ -193,14 +188,7 @@ export function uploadWs(encrypted, info, metadata, verifierB64, onprogress) {
       canceller.error = new Error(0);
       canceller.cancelled = true;
     },
-    result: upload(
+    result: upload(encrypted, metadata, verifierB64, onprogress, canceller)
-      encrypted,
-      info,
-      metadata,
-      verifierB64,
-      onprogress,
-      canceller
-    )
   };
 }
 

app/archive.js

@@ -0,0 +1,33 @@
+import { blobStream, concatStream } from './streams';
+
+export default class Archive {
+  constructor(files) {
+    this.files = Array.from(files);
+  }
+
+  get name() {
+    return this.files.length > 1 ? 'Send-Archive.zip' : this.files[0].name;
+  }
+
+  get type() {
+    return this.files.length > 1 ? 'send-archive' : this.files[0].type;
+  }
+
+  get size() {
+    return this.files.reduce((total, file) => total + file.size, 0);
+  }
+
+  get manifest() {
+    return {
+      files: this.files.map(file => ({
+        name: file.name,
+        size: file.size,
+        type: file.type
+      }))
+    };
+  }
+
+  get stream() {
+    return concatStream(this.files.map(file => blobStream(file)));
+  }
+}

app/blobSlicer.js

@@ -1,27 +0,0 @@
-export default class BlobSlicer {
-  constructor(blob, size) {
-    this.blob = blob;
-    this.index = 0;
-    this.chunkSize = size;
-  }
-
-  pull(controller) {
-    return new Promise((resolve, reject) => {
-      const bytesLeft = this.blob.size - this.index;
-      if (bytesLeft <= 0) {
-        controller.close();
-        return resolve();
-      }
-      const size = Math.min(this.chunkSize, bytesLeft);
-      const blob = this.blob.slice(this.index, this.index + size);
-      const reader = new FileReader();
-      reader.onload = () => {
-        controller.enqueue(new Uint8Array(reader.result));
-        resolve();
-      };
-      reader.onerror = reject;
-      reader.readAsArrayBuffer(blob);
-      this.index += size;
-    });
-  }
-}

app/dragManager.js

@@ -1,5 +1,6 @@
 /* global MAXFILESIZE */
-const { bytes } = require('./utils');
+import Archive from './archive';
+import { bytes } from './utils';
 
 export default function(state, emitter) {
   emitter.on('DOMContentLoaded', () => {
@@ -18,11 +19,8 @@ export default function(state, emitter) {
         if (target.files.length === 0) {
           return;
         }
-        if (target.files.length > 1) {
+        const file = new Archive(target.files);
-          // eslint-disable-next-line no-alert
+
-          return alert(state.translate('uploadPageMultipleFilesAlert'));
-        }
-        const file = target.files[0];
         if (file.size === 0) {
           return;
         }

app/ece.js

@@ -1,5 +1,4 @@
 import 'buffer';
-import BlobSlicer from './blobSlicer';
 import { transformStream } from './streams';
 
 const NONCE_LENGTH = 12;
@@ -7,7 +6,7 @@ const TAG_LENGTH = 16;
 const KEY_LENGTH = 16;
 const MODE_ENCRYPT = 'encrypt';
 const MODE_DECRYPT = 'decrypt';
-const RS = 1024 * 64;
+export const ECE_RECORD_SIZE = 1024 * 64;
 
 const encoder = new TextEncoder();
 
@@ -282,52 +281,34 @@ class StreamSlicer {
   }
 }
 
+export function encryptedSize(size, rs = ECE_RECORD_SIZE) {
+  return 21 + size + 16 * Math.floor(size / (rs - 17));
+}
+
 /*
-input: a blob or a ReadableStream containing data to be transformed
+input: a ReadableStream containing data to be transformed
 key:  Uint8Array containing key of size KEY_LENGTH
-mode: string, either 'encrypt' or 'decrypt'
 rs:   int containing record size, optional
 salt: ArrayBuffer containing salt of KEY_LENGTH length, optional
 */
-export default class ECE {
+export function encryptStream(
-  constructor(input, key, mode, rs, salt) {
+  input,
-    this.input = input;
+  key,
-    this.key = key;
+  rs = ECE_RECORD_SIZE,
-    this.mode = mode;
+  salt = generateSalt(KEY_LENGTH)
-    this.rs = rs;
+) {
-    this.salt = salt;
+  const mode = 'encrypt';
-    if (rs === undefined) {
+  const inputStream = transformStream(input, new StreamSlicer(rs, mode));
-      this.rs = RS;
+  return transformStream(inputStream, new ECETransformer(mode, key, rs, salt));
-    }
+}
-    if (salt === undefined) {
+
-      this.salt = generateSalt(KEY_LENGTH);
+/*
-    }
+input: a ReadableStream containing data to be transformed
-  }
+key:  Uint8Array containing key of size KEY_LENGTH
-
+rs:   int containing record size, optional
-  info() {
+*/
-    return {
+export function decryptStream(input, key, rs = ECE_RECORD_SIZE) {
-      recordSize: this.rs,
+  const mode = 'decrypt';
-      fileSize:
+  const inputStream = transformStream(input, new StreamSlicer(rs, mode));
-        21 + this.input.size + 16 * Math.floor(this.input.size / (this.rs - 17))
+  return transformStream(inputStream, new ECETransformer(mode, key, rs));
-    };
-  }
-
-  transform() {
-    let inputStream;
-
-    if (this.input instanceof Blob) {
-      inputStream = new ReadableStream(
-        new BlobSlicer(this.input, this.rs - 17)
-      );
-    } else {
-      inputStream = transformStream(
-        this.input,
-        new StreamSlicer(this.rs, this.mode)
-      );
-    }
-    return transformStream(
-      inputStream,
-      new ECETransformer(this.mode, this.key, this.rs, this.salt)
-    );
-  }
 }

app/fileReceiver.js

@@ -48,6 +48,7 @@ export default class FileReceiver extends Nanobus {
     this.fileInfo.type = meta.type;
     this.fileInfo.iv = meta.iv;
     this.fileInfo.size = meta.size;
+    this.fileInfo.manifest = meta.manifest;
     this.state = 'ready';
   }
 
@@ -105,6 +106,7 @@ export default class FileReceiver extends Nanobus {
         id: this.fileInfo.id,
         filename: this.fileInfo.name,
         type: this.fileInfo.type,
+        manifest: this.fileInfo.manifest,
         key: this.fileInfo.secretKey,
         requiresPassword: this.fileInfo.requiresPassword,
         password: this.fileInfo.password,

app/fileSender.js

@@ -4,6 +4,7 @@ import OwnedFile from './ownedFile';
 import Keychain from './keychain';
 import { arrayToB64, bytes } from './utils';
 import { uploadWs } from './api';
+import { encryptedSize } from './ece';
 
 export default class FileSender extends Nanobus {
   constructor(file) {
@@ -64,21 +65,15 @@ export default class FileSender extends Nanobus {
     }
     this.msg = 'encryptingFile';
     this.emit('encrypting');
-
+    const totalSize = encryptedSize(this.file.size);
-    const enc = await this.keychain.encryptStream(this.file);
+    const encStream = await this.keychain.encryptStream(this.file.stream);
     const metadata = await this.keychain.encryptMetadata(this.file);
     const authKeyB64 = await this.keychain.authKeyB64();
 
-    this.uploadRequest = uploadWs(
+    this.uploadRequest = uploadWs(encStream, metadata, authKeyB64, p => {
-      enc.stream,
+      this.progress = [p, totalSize];
-      enc.streamInfo,
-      metadata,
-      authKeyB64,
-      p => {
-        this.progress = p;
       this.emit('progress');
-      }
+    });
-    );
 
     if (this.cancelled) {
       throw new Error(0);

app/keychain.js

@@ -1,5 +1,5 @@
 import { arrayToB64, b64ToArray } from './utils';
-import ECE from './ece.js';
+import { decryptStream, encryptStream } from './ece.js';
 const encoder = new TextEncoder();
 const decoder = new TextDecoder();
 
@@ -173,24 +173,20 @@ export default class Keychain {
           iv: arrayToB64(this.iv),
           name: metadata.name,
           size: metadata.size,
-          type: metadata.type || 'application/octet-stream'
+          type: metadata.type || 'application/octet-stream',
+          manifest: metadata.manifest || {}
         })
       )
     );
     return ciphertext;
   }
 
-  encryptStream(plaintext) {
+  encryptStream(plainStream) {
-    const ece = new ECE(plaintext, this.rawSecret, 'encrypt');
+    return encryptStream(plainStream, this.rawSecret);
-    return {
-      stream: ece.transform(),
-      streamInfo: ece.info()
-    };
   }
 
   decryptStream(cryptotext) {
-    const ece = new ECE(cryptotext, this.rawSecret, 'decrypt');
+    return decryptStream(cryptotext, this.rawSecret);
-    return ece.transform();
   }
 
   async decryptFile(ciphertext) {

app/pages/welcome/index.js

@@ -33,6 +33,7 @@ module.exports = function(state, emit) {
       <input id="file-upload"
         class="inputFile"
         type="file"
+        multiple
         name="fileUploaded"
         onfocus=${onfocus}
         onblur=${onblur}
@@ -67,8 +68,10 @@ module.exports = function(state, emit) {
 
   async function upload(event) {
     event.preventDefault();
+    const Archive = require('../../archive').default;
     const target = event.target;
-    const file = target.files[0];
+    const file = new Archive(target.files);
+
     if (file.size === 0) {
       return;
     }

app/serviceWorker.js

@@ -1,6 +1,7 @@
 import Keychain from './keychain';
 import { downloadStream } from './api';
 import { transformStream } from './streams';
+import Zip from './zip';
 import contentDisposition from 'content-disposition';
 
 let noSave = false;
@@ -20,6 +21,8 @@ async function decryptStream(id) {
     return new Response(null, { status: 400 });
   }
   try {
+    let size = file.size;
+    let type = file.type;
     const keychain = new Keychain(file.key, file.nonce);
     if (file.requiresPassword) {
       keychain.setPassword(file.password, file.url);
@@ -30,8 +33,16 @@ async function decryptStream(id) {
     const body = await file.download.result;
 
     const decrypted = keychain.decryptStream(body);
+
+    let zipStream = null;
+    if (file.type === 'send-archive') {
+      const zip = new Zip(file.manifest, decrypted);
+      zipStream = zip.stream;
+      type = 'application/zip';
+      size = zip.size;
+    }
     const readStream = transformStream(
-      decrypted,
+      zipStream || decrypted,
       {
         transform(chunk, controller) {
           file.progress += chunk.length;
@@ -48,8 +59,8 @@ async function decryptStream(id) {
 
     const headers = {
       'Content-Disposition': contentDisposition(file.filename),
-      'Content-Type': file.type,
+      'Content-Type': type,
-      'Content-Length': file.size
+      'Content-Length': size
     };
     return new Response(readStream, { headers });
   } catch (e) {
@@ -81,6 +92,7 @@ self.onmessage = event => {
       password: event.data.password,
       url: event.data.url,
       type: event.data.type,
+      manifest: event.data.manifest,
       size: event.data.size,
       progress: 0
     };

app/streams.js

@@ -1,9 +1,9 @@
 /* global ReadableStream TransformStream */
 
 export function transformStream(readable, transformer, oncancel) {
-  if (typeof TransformStream === 'function') {
+  try {
     return readable.pipeThrough(new TransformStream(transformer));
-  }
+  } catch (e) {
     const reader = readable.getReader();
     return new ReadableStream({
       start(controller) {
@@ -37,4 +37,67 @@ export function transformStream(readable, transformer, oncancel) {
         }
       }
     });
+  }
+}
+
+class BlobStreamController {
+  constructor(blob, size) {
+    this.blob = blob;
+    this.index = 0;
+    this.chunkSize = size || 1024 * 64;
+  }
+
+  pull(controller) {
+    return new Promise((resolve, reject) => {
+      const bytesLeft = this.blob.size - this.index;
+      if (bytesLeft <= 0) {
+        controller.close();
+        return resolve();
+      }
+      const size = Math.min(this.chunkSize, bytesLeft);
+      const slice = this.blob.slice(this.index, this.index + size);
+      const reader = new FileReader();
+      reader.onload = () => {
+        controller.enqueue(new Uint8Array(reader.result));
+        resolve();
+      };
+      reader.onerror = reject;
+      reader.readAsArrayBuffer(slice);
+      this.index += size;
+    });
+  }
+}
+
+export function blobStream(blob, size) {
+  return new ReadableStream(new BlobStreamController(blob, size));
+}
+
+class ConcatStreamController {
+  constructor(streams) {
+    this.streams = streams;
+    this.index = 0;
+    this.reader = null;
+    this.nextReader();
+  }
+
+  nextReader() {
+    const next = this.streams[this.index++];
+    this.reader = next && next.getReader();
+  }
+
+  async pull(controller) {
+    if (!this.reader) {
+      return controller.close();
+    }
+    const data = await this.reader.read();
+    if (data.done) {
+      this.nextReader();
+      return this.pull(controller);
+    }
+    controller.enqueue(data.value);
+  }
+}
+
+export function concatStream(streams) {
+  return new ReadableStream(new ConcatStreamController(streams));
 }

app/zip.js

@@ -0,0 +1,186 @@
+import crc32 from 'crc/crc32';
+
+const encoder = new TextEncoder();
+
+function dosDateTime(dateTime = new Date()) {
+  const year = (dateTime.getFullYear() - 1980) << 9;
+  const month = (dateTime.getMonth() + 1) << 5;
+  const day = dateTime.getDate();
+  const date = year | month | day;
+  const hour = dateTime.getHours() << 11;
+  const minute = dateTime.getMinutes() << 5;
+  const second = Math.floor(dateTime.getSeconds() / 2);
+  const time = hour | minute | second;
+
+  return { date, time };
+}
+
+class File {
+  constructor(info) {
+    this.name = encoder.encode(info.name);
+    this.size = info.size;
+    this.bytesRead = 0;
+    this.crc = null;
+    this.dateTime = dosDateTime();
+  }
+
+  get header() {
+    const h = new ArrayBuffer(30 + this.name.byteLength);
+    const v = new DataView(h);
+    v.setUint32(0, 0x04034b50, true); // sig
+    v.setUint16(4, 20, true); // version
+    v.setUint16(6, 8, true); // bit flags (8 = use data descriptor)
+    v.setUint16(8, 0, true); // compression
+    v.setUint16(10, this.dateTime.time, true); // modified time
+    v.setUint16(12, this.dateTime.date, true); // modified date
+    v.setUint32(14, 0, true); // crc32 (in descriptor)
+    v.setUint32(18, 0, true); // compressed size (in descriptor)
+    v.setUint32(22, 0, true); // uncompressed size (in descriptor)
+    v.setUint16(26, this.name.byteLength, true); // name length
+    v.setUint16(28, 0, true); // extra field length
+    for (let i = 0; i < this.name.byteLength; i++) {
+      v.setUint8(30 + i, this.name[i]);
+    }
+    return new Uint8Array(h);
+  }
+
+  get dataDescriptor() {
+    const dd = new ArrayBuffer(16);
+    const v = new DataView(dd);
+    v.setUint32(0, 0x08074b50, true); // sig
+    v.setUint32(4, this.crc, true); // crc32
+    v.setUint32(8, this.size, true); // compressed size
+    v.setUint16(12, this.size, true); // uncompressed size
+    return new Uint8Array(dd);
+  }
+
+  directoryRecord(offset) {
+    const dr = new ArrayBuffer(46 + this.name.byteLength);
+    const v = new DataView(dr);
+    v.setUint32(0, 0x02014b50, true); // sig
+    v.setUint16(4, 20, true); // version made
+    v.setUint16(6, 20, true); // version required
+    v.setUint16(8, 0, true); // bit flags
+    v.setUint16(10, 0, true); // compression
+    v.setUint16(12, this.dateTime.time, true); // modified time
+    v.setUint16(14, this.dateTime.date, true); // modified date
+    v.setUint32(16, this.crc, true); // crc
+    v.setUint32(20, this.size, true); // compressed size
+    v.setUint32(24, this.size, true); // uncompressed size
+    v.setUint16(28, this.name.byteLength, true); // name length
+    v.setUint16(30, 0, true); // extra length
+    v.setUint16(32, 0, true); // comment length
+    v.setUint16(34, 0, true); // disk number
+    v.setUint16(36, 0, true); // internal file attrs
+    v.setUint32(38, 0, true); // external file attrs
+    v.setUint32(42, offset, true); // file offset
+    for (let i = 0; i < this.name.byteLength; i++) {
+      v.setUint8(46 + i, this.name[i]);
+    }
+    return new Uint8Array(dr);
+  }
+
+  get byteLength() {
+    return this.size + this.name.byteLength + 30 + 16;
+  }
+
+  append(data, controller) {
+    this.bytesRead += data.byteLength;
+    const endIndex = data.byteLength - Math.max(this.bytesRead - this.size, 0);
+    const buf = data.slice(0, endIndex);
+    this.crc = crc32(buf, this.crc);
+    controller.enqueue(buf);
+    if (endIndex < data.byteLength) {
+      return data.slice(endIndex, data.byteLength);
+    }
+  }
+}
+
+function centralDirectory(files, controller) {
+  let directoryOffset = 0;
+  let directorySize = 0;
+  for (let i = 0; i < files.length; i++) {
+    const file = files[i];
+    const record = file.directoryRecord(directoryOffset);
+    directoryOffset += file.byteLength;
+    controller.enqueue(record);
+    directorySize += record.byteLength;
+  }
+  controller.enqueue(eod(files.length, directorySize, directoryOffset));
+}
+
+function eod(fileCount, directorySize, directoryOffset) {
+  const e = new ArrayBuffer(22);
+  const v = new DataView(e);
+  v.setUint32(0, 0x06054b50, true); // sig
+  v.setUint16(4, 0, true); // disk number
+  v.setUint16(6, 0, true); // directory disk
+  v.setUint16(8, fileCount, true); // number of records
+  v.setUint16(10, fileCount, true); // total records
+  v.setUint32(12, directorySize, true); // size of directory
+  v.setUint32(16, directoryOffset, true); // offset of directory
+  v.setUint16(20, 0, true); // comment length
+  return new Uint8Array(e);
+}
+
+class ZipStreamController {
+  constructor(files, source) {
+    this.files = files;
+    this.fileIndex = 0;
+    this.file = null;
+    this.reader = source.getReader();
+    this.nextFile();
+    this.extra = null;
+  }
+
+  nextFile() {
+    this.file = this.files[this.fileIndex++];
+  }
+
+  async pull(controller) {
+    if (!this.file) {
+      // end of archive
+      centralDirectory(this.files, controller);
+      return controller.close();
+    }
+    if (this.file.bytesRead === 0) {
+      // beginning of file
+      controller.enqueue(this.file.header);
+      if (this.extra) {
+        this.extra = this.file.append(this.extra, controller);
+      }
+    }
+    if (this.file.bytesRead >= this.file.size) {
+      // end of file
+      controller.enqueue(this.file.dataDescriptor);
+      this.nextFile();
+      return this.pull(controller);
+    }
+    const data = await this.reader.read();
+    if (data.done) {
+      this.nextFile();
+      return this.pull(controller);
+    }
+    this.extra = this.file.append(data.value, controller);
+  }
+}
+
+export default class Zip {
+  constructor(manifest, source) {
+    this.files = manifest.files.map(info => new File(info));
+    this.source = source;
+  }
+
+  get stream() {
+    return new ReadableStream(new ZipStreamController(this.files, this.source));
+  }
+
+  get size() {
+    const entries = this.files.reduce(
+      (total, file) => total + file.byteLength * 2 - file.size,
+      0
+    );
+    const eod = 22;
+    return entries + eod;
+  }
+}

package-lock.json

@@ -2788,6 +2788,27 @@
         }
       }
     },
+    "crc": {
+      "version": "3.7.0",
+      "resolved": "https://registry.npmjs.org/crc/-/crc-3.7.0.tgz",
+      "integrity": "sha512-ZwmUex488OBjSVOMxnR/dIa1yxisBMJNEi+UxzXpKhax8MPsQtoRQtl5Qgo+W7pcSVkRXa3BEVjaniaWKtvKvw==",
+      "dev": true,
+      "requires": {
+        "buffer": "5.1.0"
+      },
+      "dependencies": {
+        "buffer": {
+          "version": "5.1.0",
+          "resolved": "https://registry.npmjs.org/buffer/-/buffer-5.1.0.tgz",
+          "integrity": "sha512-YkIRgwsZwJWTnyQrsBTWefizHh+8GYj3kbL1BTiAQ/9pwpino0G7B2gp5tx/FUBqUlvtxV85KNR3mwfAtv15Yw==",
+          "dev": true,
+          "requires": {
+            "base64-js": "1.3.0",
+            "ieee754": "1.1.8"
+          }
+        }
+      }
+    },
     "create-ecdh": {
       "version": "4.0.3",
       "resolved": "https://registry.npmjs.org/create-ecdh/-/create-ecdh-4.0.3.tgz",

package.json

@@ -68,6 +68,7 @@
     "base64-js": "^1.3.0",
     "content-disposition": "^0.5.2",
     "copy-webpack-plugin": "^4.5.2",
+    "crc": "^3.7.0",
     "cross-env": "^5.2.0",
     "css-loader": "^1.0.0",
     "css-mqpacker": "^6.0.2",

test/frontend/tests/api-tests.js

@@ -1,9 +1,10 @@
 import assert from 'assert';
+import Archive from '../../../app/archive';
 import * as api from '../../../app/api';
 import Keychain from '../../../app/keychain';
 
 const encoder = new TextEncoder();
-const plaintext = new Blob([encoder.encode('hello world!')]);
+const plaintext = new Archive([new Blob([encoder.encode('hello world!')])]);
 const metadata = {
   name: 'test.txt',
   type: 'text/plain'
@@ -13,11 +14,11 @@ describe('API', function() {
   describe('websocket upload', function() {
     it('returns file info on success', async function() {
       const keychain = new Keychain();
-      const enc = await keychain.encryptStream(plaintext);
+      const enc = await keychain.encryptStream(plaintext.stream);
       const meta = await keychain.encryptMetadata(metadata);
       const verifierB64 = await keychain.authKeyB64();
       const p = function() {};
-      const up = api.uploadWs(enc.stream, enc.streamInfo, meta, verifierB64, p);
+      const up = api.uploadWs(enc, meta, verifierB64, p);
 
       const result = await up.result;
       assert.ok(result.url);
@@ -27,11 +28,11 @@ describe('API', function() {
 
     it('can be cancelled', async function() {
       const keychain = new Keychain();
-      const enc = await keychain.encryptStream(plaintext);
+      const enc = await keychain.encryptStream(plaintext.stream);
       const meta = await keychain.encryptMetadata(metadata);
       const verifierB64 = await keychain.authKeyB64();
       const p = function() {};
-      const up = api.uploadWs(enc.stream, enc.streamInfo, meta, verifierB64, p);
+      const up = api.uploadWs(enc, meta, verifierB64, p);
       up.cancel();
       try {
         await up.result;

test/frontend/tests/fileSender-tests.js

@@ -1,17 +1,19 @@
 import assert from 'assert';
 import FileSender from '../../../app/fileSender';
+import Archive from '../../../app/archive';
 
 // FileSender uses a File in real life but a Blob works for testing
 const blob = new Blob(['hello world!'], { type: 'text/plain' });
 blob.name = 'text.txt';
+const archive = new Archive([blob]);
 
 describe('FileSender', function() {
   describe('upload', function() {
     it('returns an OwnedFile on success', async function() {
-      const fs = new FileSender(blob);
+      const fs = new FileSender(archive);
       const file = await fs.upload();
       assert.ok(file.id);
-      assert.equal(file.name, blob.name);
+      assert.equal(file.name, archive.name);
     });
   });
 });

test/frontend/tests/streaming-tests.js

@@ -2,9 +2,10 @@ const ece = require('http_ece');
 require('buffer');
 
 import assert from 'assert';
+import Archive from '../../../app/archive';
 import { b64ToArray } from '../../../app/utils';
-import BlobSlicer from '../../../app/blobSlicer';
+import { blobStream, concatStream } from '../../../app/streams';
-import ECE from '../../../app/ece.js';
+import { decryptStream, encryptStream } from '../../../app/ece.js';
 
 const rs = 36;
 
@@ -25,15 +26,52 @@ const encrypted = ece.encrypt(buffer, params);
 const decrypted = ece.decrypt(encrypted, params);
 
 describe('Streaming', function() {
+  describe('blobStream', function() {
+    it('reads the entire blob', async function() {
+      const len = 12345;
+      const chunkSize = 1024;
+      const blob = new Blob([new Uint8Array(len)]);
+      const stream = blobStream(blob, chunkSize);
+      const reader = stream.getReader();
+      let bytes = 0;
+      let data = await reader.read();
+      while (!data.done) {
+        bytes += data.value.byteLength;
+        assert.ok(data.value.byteLength <= chunkSize, 'chunk too big');
+        data = await reader.read();
+      }
+      assert.equal(bytes, len);
+    });
+  });
+
+  describe('concatStream', function() {
+    it('reads all the streams', async function() {
+      const count = 5;
+      const len = 12345;
+      const streams = Array.from({ length: count }, () =>
+        blobStream(new Blob([new Uint8Array(len)]))
+      );
+      const concat = concatStream(streams);
+      const reader = concat.getReader();
+      let bytes = 0;
+      let data = await reader.read();
+      while (!data.done) {
+        bytes += data.value.byteLength;
+        data = await reader.read();
+      }
+      assert.equal(bytes, len * count);
+    });
+  });
+
   //testing against http_ece's implementation
   describe('ECE', function() {
     const key = b64ToArray(keystr);
     const salt = b64ToArray(testSalt).buffer;
-    const blob = new Blob([str], { type: 'text/plain' });
 
     it('can encrypt', async function() {
-      const ece = new ECE(blob, key, 'encrypt', rs, salt);
+      const stream = new Archive([new Blob([str], { type: 'text/plain' })])
-      const encStream = await ece.transform();
+        .stream;
+      const encStream = encryptStream(stream, key, rs, salt);
       const reader = encStream.getReader();
 
       let result = Buffer.from([]);
@@ -48,11 +86,8 @@ describe('Streaming', function() {
     });
 
     it('can decrypt', async function() {
-      const blobStream = new ReadableStream(
+      const stream = new Archive([new Blob([encrypted])]).stream;
-        new BlobSlicer(new Blob([encrypted]), rs)
+      const decStream = decryptStream(stream, key, rs);
-      );
-      const ece = new ECE(blobStream, key, 'decrypt', rs);
-      const decStream = await ece.transform();
 
       const reader = decStream.getReader();
       let result = Buffer.from([]);

test/frontend/tests/workflow-tests.js

@@ -1,4 +1,5 @@
 import assert from 'assert';
+import Archive from '../../../app/archive';
 import FileSender from '../../../app/fileSender';
 import FileReceiver from '../../../app/fileReceiver';
 
@@ -11,12 +12,13 @@ const noSave = true || !headless; // only run the saveFile code if headless
 // FileSender uses a File in real life but a Blob works for testing
 const blob = new Blob([new ArrayBuffer(1024 * 128)], { type: 'text/plain' });
 blob.name = 'test.txt';
+const archive = new Archive([blob]);
 navigator.serviceWorker.register('/serviceWorker.js');
 
 describe('Upload / Download flow', function() {
   this.timeout(0);
   it('can only download once by default', async function() {
-    const fs = new FileSender(blob);
+    const fs = new FileSender(archive);
     const file = await fs.upload();
     const fr = new FileReceiver({
       secretKey: file.toJSON().secretKey,
@@ -36,7 +38,7 @@ describe('Upload / Download flow', function() {
   });
 
   it('downloads with the correct password', async function() {
-    const fs = new FileSender(blob);
+    const fs = new FileSender(archive);
     const file = await fs.upload();
     await file.setPassword('magic');
     const fr = new FileReceiver({
@@ -53,7 +55,7 @@ describe('Upload / Download flow', function() {
   });
 
   it('blocks invalid passwords from downloading', async function() {
-    const fs = new FileSender(blob);
+    const fs = new FileSender(archive);
     const file = await fs.upload();
     await file.setPassword('magic');
     const fr = new FileReceiver({
@@ -81,7 +83,7 @@ describe('Upload / Download flow', function() {
   });
 
   it('retries a bad nonce', async function() {
-    const fs = new FileSender(blob);
+    const fs = new FileSender(archive);
     const file = await fs.upload();
     const fr = new FileReceiver({
       secretKey: file.toJSON().secretKey,
@@ -90,11 +92,11 @@ describe('Upload / Download flow', function() {
       requiresPassword: false
     });
     await fr.getMetadata();
-    assert.equal(fr.fileInfo.name, blob.name);
+    assert.equal(fr.fileInfo.name, archive.name);
   });
 
   it('can cancel the upload', async function() {
-    const fs = new FileSender(blob);
+    const fs = new FileSender(archive);
     const up = fs.upload();
     fs.cancel(); // before encrypting
     try {
@@ -122,7 +124,7 @@ describe('Upload / Download flow', function() {
   });
 
   it('can cancel the download', async function() {
-    const fs = new FileSender(blob);
+    const fs = new FileSender(archive);
     const file = await fs.upload();
     const fr = new FileReceiver({
       secretKey: file.toJSON().secretKey,
@@ -142,7 +144,7 @@ describe('Upload / Download flow', function() {
 
   it('can increase download count on download', async function() {
     this.timeout(0);
-    const fs = new FileSender(blob);
+    const fs = new FileSender(archive);
     const file = await fs.upload();
     const fr = new FileReceiver({
       secretKey: file.toJSON().secretKey,
@@ -157,7 +159,7 @@ describe('Upload / Download flow', function() {
   });
 
   it('does not increase download count when download cancelled', async function() {
-    const fs = new FileSender(blob);
+    const fs = new FileSender(archive);
     const file = await fs.upload();
     const fr = new FileReceiver({
       secretKey: file.toJSON().secretKey,
@@ -178,7 +180,7 @@ describe('Upload / Download flow', function() {
   });
 
   it('can allow multiple downloads', async function() {
-    const fs = new FileSender(blob);
+    const fs = new FileSender(archive);
     const file = await fs.upload();
     const fr = new FileReceiver({
       secretKey: file.toJSON().secretKey,
@@ -204,7 +206,7 @@ describe('Upload / Download flow', function() {
   });
 
   it('can delete the file before download', async function() {
-    const fs = new FileSender(blob);
+    const fs = new FileSender(archive);
     const file = await fs.upload();
     const fr = new FileReceiver({
       secretKey: file.toJSON().secretKey,