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1/*
2 * Copyright (C) 2022 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17import {FunctionUtils} from 'common/function_utils';
18import {
19  BuganizerAttachmentsDownloadEmitter,
20  OnBuganizerAttachmentsDownloaded,
21  OnBuganizerAttachmentsDownloadStart,
22} from 'interfaces/buganizer_attachments_download_emitter';
23import {MessageType, OpenBuganizerResponse, OpenRequest, WebCommandMessage} from './messages';
24
25export class AbtChromeExtensionProtocol implements BuganizerAttachmentsDownloadEmitter {
26  static readonly ABT_EXTENSION_ID = 'mbbaofdfoekifkfpgehgffcpagbbjkmj';
27  private onAttachmentsDownloadStart: OnBuganizerAttachmentsDownloadStart =
28    FunctionUtils.DO_NOTHING;
29  private onAttachmentsDownloaded: OnBuganizerAttachmentsDownloaded =
30    FunctionUtils.DO_NOTHING_ASYNC;
31
32  setOnBuganizerAttachmentsDownloadStart(callback: OnBuganizerAttachmentsDownloadStart) {
33    this.onAttachmentsDownloadStart = callback;
34  }
35
36  setOnBuganizerAttachmentsDownloaded(callback: OnBuganizerAttachmentsDownloaded) {
37    this.onAttachmentsDownloaded = callback;
38  }
39
40  run() {
41    const urlParams = new URLSearchParams(window.location.search);
42    if (urlParams.get('source') !== 'openFromExtension' || !chrome) {
43      return;
44    }
45
46    this.onAttachmentsDownloadStart();
47
48    const openRequestMessage: OpenRequest = {
49      action: MessageType.OPEN_REQUEST,
50    };
51
52    chrome.runtime.sendMessage(
53      AbtChromeExtensionProtocol.ABT_EXTENSION_ID,
54      openRequestMessage,
55      async (message) => await this.onMessageReceived(message)
56    );
57  }
58
59  private async onMessageReceived(message: WebCommandMessage) {
60    if (this.isOpenBuganizerResponseMessage(message)) {
61      await this.onOpenBuganizerResponseMessageReceived(message);
62    } else {
63      console.warn('ABT chrome extension protocol received unexpected message:', message);
64    }
65  }
66
67  private async onOpenBuganizerResponseMessageReceived(message: OpenBuganizerResponse) {
68    console.log('ABT chrome extension protocol received OpenBuganizerResponse message:', message);
69
70    if (message.attachments.length === 0) {
71      console.warn('ABT chrome extension protocol received no attachments');
72    }
73
74    const filesBlobPromises = message.attachments.map(async (attachment) => {
75      const fileQueryResponse = await fetch(attachment.objectUrl);
76      const blob = await fileQueryResponse.blob();
77
78      // Note: the received blob's media type is wrong. It is always set to "image/png".
79      // Context: http://google3/javascript/closure/html/safeurl.js?g=0&l=256&rcl=273756987
80      // Cloning the blob clears the media type.
81      const file = new File([blob], attachment.name);
82
83      return file;
84    });
85
86    const files = await Promise.all(filesBlobPromises);
87    await this.onAttachmentsDownloaded(files);
88  }
89
90  private isOpenBuganizerResponseMessage(
91    message: WebCommandMessage
92  ): message is OpenBuganizerResponse {
93    return message.action === MessageType.OPEN_BUGANIZER_RESPONSE;
94  }
95}
96