42 lines
1.3 KiB
TypeScript
42 lines
1.3 KiB
TypeScript
/**
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* 默认 gravatar.com 前缀
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*/
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const DEFAULT_AVATAR_PREFIX = 'https://gravatar.com/avatar';
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/**
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* 当缺少邮箱或邮箱为空时使用的占位 hash
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* 32 个 0，符合 MD5 长度要求，Gravatar 会回退到默认头像样式
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*/
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const DEFAULT_AVATAR_HASH = '00000000000000000000000000000000';
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/**
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* 辅助函数：生成 gravatar.com 头像地址 (MD5 算法)
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* 优先使用邮箱；当邮箱不存在或为空时，使用昵称计算 MD5。
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*/
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export const getCravatar = async (
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email: string | null | undefined,
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name?: string | null | undefined,
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prefix?: string
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): Promise<string> => {
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const avatarPrefix = prefix || DEFAULT_AVATAR_PREFIX;
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const pickIdentifier = (value: string | null | undefined) => {
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if (!value || typeof value !== 'string') return null;
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const trimmed = value.trim().toLowerCase();
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return trimmed || null;
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};
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const identifier = pickIdentifier(email) || pickIdentifier(name);
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if (!identifier) {
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return `${avatarPrefix}/${DEFAULT_AVATAR_HASH}?s=120&d=retro`;
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}
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const msgUint8 = new TextEncoder().encode(identifier);
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const hashBuffer = await crypto.subtle.digest('MD5', msgUint8);
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const hashArray = Array.from(new Uint8Array(hashBuffer));
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const hashHex = hashArray.map((b) => b.toString(16).padStart(2, '0')).join('');
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return `${avatarPrefix}/${hashHex}?s=120&d=retro`;
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};
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