全新出发

electron/services/export/parsers/contentDecoder.ts

@@ -0,0 +1,67 @@
+export function looksLikeHex(s: string): boolean {
+  if (s.length % 2 !== 0) return false
+  return /^[0-9a-fA-F]+$/.test(s)
+}
+
+export function looksLikeBase64(s: string): boolean {
+  if (s.length % 4 !== 0) return false
+  return /^[A-Za-z0-9+/]+={0,2}$/.test(s)
+}
+
+export function decodeBinaryContent(data: Buffer): string {
+  if (data.length === 0) return ''
+  try {
+    if (data.length >= 4) {
+      const magic = data.readUInt32LE(0)
+      if (magic === 0xFD2FB528) {
+        // eslint-disable-next-line @typescript-eslint/no-var-requires
+        const fzstd = require('fzstd')
+        const decompressed = fzstd.decompress(data)
+        return Buffer.from(decompressed).toString('utf-8')
+      }
+    }
+    const decoded = data.toString('utf-8')
+    const replacementCount = (decoded.match(/\uFFFD/g) || []).length
+    if (replacementCount < decoded.length * 0.2) {
+      return decoded.replace(/\uFFFD/g, '')
+    }
+    return data.toString('latin1')
+  } catch {
+    return ''
+  }
+}
+
+export function decodeMaybeCompressed(raw: any): string {
+  if (!raw) return ''
+  if (typeof raw === 'string') {
+    if (raw.length === 0) return ''
+    if (/^[0-9]+$/.test(raw)) {
+      return raw
+    }
+    // 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
+    if (raw.length > 16 && looksLikeHex(raw)) {
+      const bytes = Buffer.from(raw, 'hex')
+      if (bytes.length > 0) return decodeBinaryContent(bytes)
+    }
+    // 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
+    // 短字符串（如 "test", "home" 等）容易被误判为 base64
+    if (raw.length > 16 && looksLikeBase64(raw)) {
+      try {
+        const bytes = Buffer.from(raw, 'base64')
+        return decodeBinaryContent(bytes)
+      } catch {
+        return raw
+      }
+    }
+    return raw
+  }
+  return ''
+}
+
+export function decodeMessageContent(messageContent: any, compressContent: any): string {
+  let content = decodeMaybeCompressed(compressContent)
+  if (!content || content.length === 0) {
+    content = decodeMaybeCompressed(messageContent)
+  }
+  return content
+}