jamo.siu@gmail.com
126 lines
3.6 KiB
TypeScript
126 lines
3.6 KiB
TypeScript
import { useFrontmatter } from "@rspress/core/runtime"
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// MD5 — self-contained, works in any JS environment
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function md5Hex(message: string): string {
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const S = [
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7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, 5, 9, 14, 20, 5, 9, 14, 20, 5, 9,
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14, 20, 5, 9, 14, 20, 4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23, 6, 10, 15, 21,
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6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21,
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]
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const T: number[] = []
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for (let i = 0; i < 64; i++) {
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T[i] = Math.floor(Math.abs(Math.sin(i + 1)) * 0x100000000) | 0
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}
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const bytes: number[] = []
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for (let i = 0; i < message.length; i++) {
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const c = message.charCodeAt(i)
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if (c < 0x80) bytes.push(c)
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else if (c < 0x800) {
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bytes.push(0xc0 | (c >> 6))
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bytes.push(0x80 | (c & 0x3f))
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} else {
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bytes.push(0xe0 | (c >> 12))
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bytes.push(0x80 | ((c >> 6) & 0x3f))
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bytes.push(0x80 | (c & 0x3f))
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}
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}
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const bitLen = bytes.length * 8
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bytes.push(0x80)
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while ((bytes.length + 8) % 64 !== 0) bytes.push(0)
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for (let i = 0; i < 4; i++) bytes.push((bitLen >>> (i * 8)) & 0xff)
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for (let i = 0; i < 4; i++) bytes.push(0)
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let a0 = 0x67452301,
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b0 = 0xefcdab89,
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c0 = 0x98badcfe,
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d0 = 0x10325476
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for (let offset = 0; offset < bytes.length; offset += 64) {
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const M = new Array(16)
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for (let i = 0; i < 16; i++) {
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M[i] =
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bytes[offset + i * 4] |
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(bytes[offset + i * 4 + 1] << 8) |
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(bytes[offset + i * 4 + 2] << 16) |
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(bytes[offset + i * 4 + 3] << 24)
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}
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let A = a0,
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B = b0,
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C = c0,
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D = d0
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for (let i = 0; i < 64; i++) {
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let F: number, g: number
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if (i < 16) {
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F = (B & C) | (~B & D)
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g = i
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} else if (i < 32) {
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F = (D & B) | (~D & C)
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g = (5 * i + 1) % 16
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} else if (i < 48) {
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F = B ^ C ^ D
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g = (3 * i + 5) % 16
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} else {
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F = C ^ (B | ~D)
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g = (7 * i) % 16
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}
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F = (F + A + T[i] + M[g]) | 0
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A = D
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D = C
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C = B
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B = (B + ((F << S[i]) | (F >>> (32 - S[i])))) | 0
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}
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a0 = (a0 + A) | 0
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b0 = (b0 + B) | 0
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c0 = (c0 + C) | 0
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d0 = (d0 + D) | 0
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}
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return [a0, b0, c0, d0]
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.map(
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(x) =>
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((x >>> 0) & 0xff).toString(16).padStart(2, "0") +
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((x >>> 8) & 0xff).toString(16).padStart(2, "0") +
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((x >>> 16) & 0xff).toString(16).padStart(2, "0") +
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((x >>> 24) & 0xff).toString(16).padStart(2, "0")
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)
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.join("")
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}
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function gravatarUrl(email: string, size = 80): string {
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const normalized = email.trim().toLowerCase()
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const hash = md5Hex(normalized)
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return `https://cravatar.cn/avatar/${hash}?s=${size}&d=robohash&r=g`
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}
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interface AuthorInfo {
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name?: string
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email?: string
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}
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export function Author({ className }: { className?: string }) {
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const { frontmatter } = useFrontmatter()
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const author = frontmatter?.author as AuthorInfo | undefined
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if (!author?.name?.trim()) return null
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const src = author.email?.trim() ? gravatarUrl(author.email) : null
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return (
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<a
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href={author.email?.trim() ? `mailto:${author.email}` : undefined}
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className={`flex items-center gap-2 my-6 p-1 rounded-full
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border border-(--rp-c-divider) bg-(--rp-c-bg-soft)
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no-underline transition-colors hover:bg-(--rp-c-bg-mute)
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cursor-pointer select-none w-fit${className ? ` ${className}` : ""}`}>
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{src && <img src={src} alt={author.name} width={32} height={32} className="rounded-full" />}
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<span className="text-sm text-(--rp-c-text-2) pr-2">{author.name}</span>
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</a>
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)
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}
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