Differential D7901 Diff 27027 web/media/encryption-utils.js

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web/media/encryption-utils.js

// @flow		// @flow

import invariant from 'invariant';		import invariant from 'invariant';
		import { thumbHashToDataURL } from 'thumbhash';

import { hexToUintArray, uintArrayToHexString } from 'lib/media/data-utils.js';		import { hexToUintArray, uintArrayToHexString } from 'lib/media/data-utils.js';
import { fileInfoFromData } from 'lib/media/file-utils.js';		import { fileInfoFromData } from 'lib/media/file-utils.js';
import { fetchableMediaURI } from 'lib/media/media-utils.js';		import { fetchableMediaURI } from 'lib/media/media-utils.js';
import type {		import type {
MediaMissionFailure,		MediaMissionFailure,
MediaMissionStep,		MediaMissionStep,
} from 'lib/types/media-types.js';		} from 'lib/types/media-types.js';
import { getMessageForException } from 'lib/utils/errors.js';		import { getMessageForException } from 'lib/utils/errors.js';
import { calculatePaddedLength, pad, unpad } from 'lib/utils/pkcs7-padding.js';		import { calculatePaddedLength, pad, unpad } from 'lib/utils/pkcs7-padding.js';

import * as AES from './aes-crypto-utils.js';		import * as AES from './aes-crypto-utils.js';
		import { base64DecodeBuffer } from '../utils/base64-utils.js';

const PADDING_THRESHOLD = 5000000; // 5MB		const PADDING_THRESHOLD = 5000000; // 5MB

type EncryptFileResult = {		type EncryptFileResult = {
+success: true,		+success: true,
+file: File,		+file: File,
+uri: string,		+uri: string,
+encryptionKey: string,		+encryptionKey: string,
▲ Show 20 Lines • Show All 207 Lines • ▼ Show 20 Lines	return {
steps,		steps,
result: { success: false, reason: 'save_blob_failed' },		result: { success: false, reason: 'save_blob_failed' },
};		};
}		}

return { steps, result: { success: true, uri: objectURL } };		return { steps, result: { success: true, uri: objectURL } };
}		}

export { encryptFile, decryptMedia };		async function decryptThumbhashToDataURL(
		encryptedThumbHash: string,
		keyHex: string,
		): Promise<string> {
		const encryptedData = base64DecodeBuffer(encryptedThumbHash);
		const thumbhashBytes = await AES.decrypt(
		hexToUintArray(keyHex),
		encryptedData,
		);
		return thumbHashToDataURL(thumbhashBytes);
		}

		export { encryptFile, decryptMedia, decryptThumbhashToDataURL };