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22 lines
938 B
TypeScript
22 lines
938 B
TypeScript
// Copyright 2024 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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import { AVATAR_COLOR_COUNT, AvatarColors } from '../types/Colors.std.js';
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import type { AvatarColorType } from '../types/Colors.std.js';
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// See https://github.com/signalapp/ringrtc/blob/49b4b8a16f997c7fa9a429e96aa83f80b2065c63/src/rust/src/lite/call_links/base16.rs#L8
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const BASE_16_CONSONANT_ALPHABET = 'bcdfghkmnpqrstxz';
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// See https://github.com/signalapp/ringrtc/blob/49b4b8a16f997c7fa9a429e96aa83f80b2065c63/src/rust/src/lite/call_links/base16.rs#L127-L139
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export function getColorForCallLink(rootKey: string): AvatarColorType {
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const rootKeyStart = rootKey.slice(0, 2);
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const upper = (BASE_16_CONSONANT_ALPHABET.indexOf(rootKeyStart[0]) || 0) * 16;
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const lower = BASE_16_CONSONANT_ALPHABET.indexOf(rootKeyStart[1]) || 0;
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const firstByte = upper + lower;
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const index = firstByte % AVATAR_COLOR_COUNT;
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return AvatarColors[index];
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}
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