68 lines
2.1 KiB
TypeScript
68 lines
2.1 KiB
TypeScript
export function looksLikeHex(s: string): boolean {
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if (s.length % 2 !== 0) return false
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return /^[0-9a-fA-F]+$/.test(s)
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}
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export function looksLikeBase64(s: string): boolean {
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if (s.length % 4 !== 0) return false
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return /^[A-Za-z0-9+/]+={0,2}$/.test(s)
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}
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export function decodeBinaryContent(data: Buffer): string {
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if (data.length === 0) return ''
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try {
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if (data.length >= 4) {
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const magic = data.readUInt32LE(0)
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if (magic === 0xFD2FB528) {
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// eslint-disable-next-line @typescript-eslint/no-var-requires
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const fzstd = require('fzstd')
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const decompressed = fzstd.decompress(data)
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return Buffer.from(decompressed).toString('utf-8')
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}
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}
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const decoded = data.toString('utf-8')
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const replacementCount = (decoded.match(/\uFFFD/g) || []).length
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if (replacementCount < decoded.length * 0.2) {
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return decoded.replace(/\uFFFD/g, '')
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}
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return data.toString('latin1')
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} catch {
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return ''
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}
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}
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export function decodeMaybeCompressed(raw: any): string {
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if (!raw) return ''
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if (typeof raw === 'string') {
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if (raw.length === 0) return ''
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if (/^[0-9]+$/.test(raw)) {
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return raw
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}
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// 只有当字符串足够长（超过16字符）且看起来像 hex 时才尝试解码
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if (raw.length > 16 && looksLikeHex(raw)) {
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const bytes = Buffer.from(raw, 'hex')
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if (bytes.length > 0) return decodeBinaryContent(bytes)
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}
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// 只有当字符串足够长（超过16字符）且看起来像 base64 时才尝试解码
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// 短字符串（如 "test", "home" 等）容易被误判为 base64
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if (raw.length > 16 && looksLikeBase64(raw)) {
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try {
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const bytes = Buffer.from(raw, 'base64')
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return decodeBinaryContent(bytes)
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} catch {
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return raw
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}
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}
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return raw
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}
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return ''
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}
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export function decodeMessageContent(messageContent: any, compressContent: any): string {
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let content = decodeMaybeCompressed(compressContent)
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if (!content || content.length === 0) {
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content = decodeMaybeCompressed(messageContent)
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}
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return content
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}
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