全新出发

electron/services/export/media/attachmentResolver.ts

@@ -0,0 +1,29 @@
+import * as fs from 'fs'
+import * as path from 'path'
+import * as crypto from 'crypto'
+
+export async function getMediaFileStat(sourcePath: string): Promise<{ size: number; mtimeMs: number } | null> {
+  try {
+    const stat = await fs.promises.stat(sourcePath)
+    if (!stat.isFile()) return null
+    return {
+      size: Number.isFinite(stat.size) ? Math.max(0, Math.floor(stat.size)) : 0,
+      mtimeMs: Number.isFinite(stat.mtimeMs) ? Math.max(0, Math.floor(stat.mtimeMs)) : 0
+    }
+  } catch {
+    return null
+  }
+}
+
+export function buildMediaFileCachePath(
+  cacheRoot: string,
+  kind: 'image' | 'video' | 'emoji',
+  sourcePath: string,
+  fileStat: { size: number; mtimeMs: number }
+): string {
+  const normalizedSource = path.resolve(sourcePath)
+  const rawKey = `${kind}\u001f${normalizedSource}\u001f${fileStat.size}\u001f${fileStat.mtimeMs}`
+  const digest = crypto.createHash('sha1').update(rawKey).digest('hex')
+  const ext = path.extname(normalizedSource) || ''
+  return path.join(cacheRoot, kind, digest.slice(0, 2), `${digest}${ext}`)
+}