diff --git a/extensions/bluebubbles/src/local-file-access.ts b/extensions/bluebubbles/src/local-file-access.ts
deleted file mode 100644
index 9c79e0eb5cc..00000000000
--- a/extensions/bluebubbles/src/local-file-access.ts
+++ /dev/null
@@ -1,62 +0,0 @@
-import path from "node:path";
-import { fileURLToPath, URL } from "node:url";
-import { normalizeLowercaseStringOrEmpty } from "openclaw/plugin-sdk/text-runtime";
-
-function isLocalFileUrlHost(hostname: string): boolean {
-  const normalized = normalizeLowercaseStringOrEmpty(hostname);
-  return normalized === "" || normalized === "localhost";
-}
-
-function assertNoWindowsNetworkPath(filePath: string, label = "Path"): void {
-  if (process.platform !== "win32") {
-    return;
-  }
-  const normalized = filePath.replace(/\//g, "\\");
-  if (normalized.startsWith("\\\\?\\UNC\\") || normalized.startsWith("\\\\")) {
-    throw new Error(`${label} cannot use Windows network paths: ${filePath}`);
-  }
-}
-
-export function safeFileURLToPath(fileUrl: string): string {
-  let parsed: URL;
-  try {
-    parsed = new URL(fileUrl);
-  } catch {
-    throw new Error(`Invalid file:// URL: ${fileUrl}`);
-  }
-  if (parsed.protocol !== "file:") {
-    throw new Error(`Invalid file:// URL: ${fileUrl}`);
-  }
-  if (!isLocalFileUrlHost(parsed.hostname)) {
-    throw new Error(`file:// URLs with remote hosts are not allowed: ${fileUrl}`);
-  }
-  const filePath = fileURLToPath(parsed);
-  assertNoWindowsNetworkPath(filePath, "Local file URL");
-  return filePath;
-}
-
-function trySafeFileURLToPath(fileUrl: string): string | undefined {
-  try {
-    return safeFileURLToPath(fileUrl);
-  } catch {
-    return undefined;
-  }
-}
-
-export function basenameFromMediaSource(source?: string): string | undefined {
-  if (!source) {
-    return undefined;
-  }
-  if (source.startsWith("file://")) {
-    const filePath = trySafeFileURLToPath(source);
-    return filePath ? path.basename(filePath) || undefined : undefined;
-  }
-  if (/^https?:\/\//i.test(source)) {
-    try {
-      return path.basename(new URL(source).pathname) || undefined;
-    } catch {
-      return undefined;
-    }
-  }
-  return path.basename(source) || undefined;
-}
diff --git a/extensions/bluebubbles/src/media-send.ts b/extensions/bluebubbles/src/media-send.ts
index 75ac213b05a..003e022d9d1 100644
--- a/extensions/bluebubbles/src/media-send.ts
+++ b/extensions/bluebubbles/src/media-send.ts
@@ -2,11 +2,11 @@ import { constants as fsConstants } from "node:fs";
 import fs from "node:fs/promises";
 import os from "node:os";
 import path from "node:path";
+import { basenameFromMediaSource, safeFileURLToPath } from "openclaw/plugin-sdk/infra-runtime";
 import { resolveChannelMediaMaxBytes } from "openclaw/plugin-sdk/media-runtime";
 import { lowercasePreservingWhitespace } from "openclaw/plugin-sdk/text-runtime";
 import { resolveBlueBubblesAccount } from "./accounts.js";
 import { sendBlueBubblesAttachment } from "./attachments.js";
-import { basenameFromMediaSource, safeFileURLToPath } from "./local-file-access.js";
 import { resolveBlueBubblesMessageId } from "./monitor-reply-cache.js";
 import type { OpenClawConfig } from "./runtime-api.js";
 import { getBlueBubblesRuntime } from "./runtime.js";