38 lines
1.7 KiB
TypeScript
38 lines
1.7 KiB
TypeScript
// Copyright 2018-2021 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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export type MIMEType = string & { _mimeTypeBrand: never };
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export const APPLICATION_OCTET_STREAM = 'application/octet-stream' as MIMEType;
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export const APPLICATION_JSON = 'application/json' as MIMEType;
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export const AUDIO_AAC = 'audio/aac' as MIMEType;
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export const AUDIO_MP3 = 'audio/mp3' as MIMEType;
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export const IMAGE_GIF = 'image/gif' as MIMEType;
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export const IMAGE_JPEG = 'image/jpeg' as MIMEType;
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export const IMAGE_PNG = 'image/png' as MIMEType;
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export const IMAGE_WEBP = 'image/webp' as MIMEType;
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export const IMAGE_ICO = 'image/x-icon' as MIMEType;
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export const IMAGE_BMP = 'image/bmp' as MIMEType;
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export const VIDEO_MP4 = 'video/mp4' as MIMEType;
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export const VIDEO_QUICKTIME = 'video/quicktime' as MIMEType;
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export const LONG_MESSAGE = 'text/x-signal-plain' as MIMEType;
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export const isGif = (value: string): value is MIMEType =>
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value === 'image/gif';
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export const isJPEG = (value: string): value is MIMEType =>
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value === 'image/jpeg';
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export const isImage = (value: string): value is MIMEType =>
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Boolean(value) && value.startsWith('image/');
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export const isVideo = (value: string): value is MIMEType =>
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Boolean(value) && value.startsWith('video/');
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// As of 2020-04-16 aif files do not play in Electron nor Chrome. We should only
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// recognize them as file attachments.
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export const isAudio = (value: string): value is MIMEType =>
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Boolean(value) && value.startsWith('audio/') && !value.endsWith('aiff');
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export const isLongMessage = (value: unknown): value is MIMEType =>
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value === LONG_MESSAGE;
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export const fromString = (value: string): MIMEType => {
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return value as MIMEType;
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};
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