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@@ -47,3 +47,74 @@ export function displayTime(time) {
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return formatTime(date, 'MM-dd HH:mm')
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}
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+
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+/**
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+ * 解密/解码 Base64 字符串为 UTF-8 字符串
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+ * @param {string} str - Base64 编码的字符串
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+ * @returns {string}
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+ */
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+export function decodeBase64(str) {
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+ if (!str) return ''
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+ const cleanStr = String(str).trim().replace(/\s+/g, '')
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+ // 检查是否为 base64 格式
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+ const isBase64 = /^[A-Za-z0-9+/=]+$/.test(cleanStr)
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+ if (!isBase64) return str
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+
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+ try {
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+ // 1. Base64 解码为二进制字符串
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+ const atobPolyfill = (s) => {
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+ if (typeof atob === 'function') return atob(s)
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+ const chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/='
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+ let output = ''
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+ const clean = s.replace(/=+$/, '')
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+ for (let bc = 0, bs, buffer, idx = 0; idx < clean.length; ) {
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+ const char = clean.charAt(idx++)
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+ const buffer = chars.indexOf(char)
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+ if (buffer === -1) throw new Error('Invalid base64 character')
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+ bs = bc % 4 ? bs * 64 + buffer : buffer
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+ if (bc++ % 4) {
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+ output += String.fromCharCode(255 & bs >> (-2 * bc & 6))
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+ }
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+ }
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+ return output
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+ }
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+
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+ const decodedBinary = atobPolyfill(cleanStr)
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+
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+ // 2. 将二进制字符串解码为 UTF-8 字符串
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+ const decodeUtf8 = (bin) => {
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+ let result = ''
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+ let i = 0
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+ while (i < bin.length) {
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+ const c1 = bin.charCodeAt(i++)
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+ if (c1 < 128) {
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+ result += String.fromCharCode(c1)
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+ } else if (c1 > 191 && c1 < 224) {
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+ const c2 = bin.charCodeAt(i++)
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+ result += String.fromCharCode(((c1 & 31) << 6) | (c2 & 63))
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+ } else if (c1 > 223 && c1 < 240) {
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+ const c2 = bin.charCodeAt(i++)
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+ const c3 = bin.charCodeAt(i++)
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+ result += String.fromCharCode(((c1 & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63))
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+ } else {
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+ const c2 = bin.charCodeAt(i++)
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+ const c3 = bin.charCodeAt(i++)
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+ const c4 = bin.charCodeAt(i++)
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+ const codepoint = ((c1 & 7) << 18) | ((c2 & 63) << 12) | ((c3 & 63) << 6) | (c4 & 63)
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+ if (codepoint > 0xffff) {
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+ const offset = codepoint - 0x10000
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+ result += String.fromCharCode((offset >> 10) + 0xd800, (offset & 0x3ff) + 0xdc00)
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+ } else {
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+ result += String.fromCharCode(codepoint)
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+ }
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+ }
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+ }
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+ return result
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+ }
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+
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+ return decodeUtf8(decodedBinary)
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+ } catch (e) {
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+ console.error('Base64 decode failed:', e)
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+ return str
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+ }
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+}
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