fix(medusa,file-local,file-s3,core-flows): fix csv parsing special characters (#13649)

* fix(): fix csv parsing special characters

* remove other tries

* tweak

* remove comments

* Create rude-mirrors-hang.md

packages/modules/providers/file-local/src/services/local-file.ts

@@ -57,7 +57,19 @@ export class LocalFileService extends AbstractFileProviderService {
     const filePath = this.getUploadFilePath(baseDir, fileKey)
     const fileUrl = this.getUploadFileUrl(fileKey)
 
-    const content = Buffer.from(file.content as string, "binary")
+    let content: Buffer
+    try {
+      const decoded = Buffer.from(file.content, "base64")
+      if (decoded.toString("base64") === file.content) {
+        content = decoded
+      } else {
+        content = Buffer.from(file.content, "utf8")
+      }
+    } catch {
+      // Last-resort fallback: binary
+      content = Buffer.from(file.content, "binary")
+    }
+
     await fs.writeFile(filePath, content)
 
     return {

packages/modules/providers/file-s3/src/services/s3-file.ts

@@ -120,7 +120,19 @@ export class S3FileService extends AbstractFileProviderService {
       parsedFilename.ext
     }`
 
-    const content = Buffer.from(file.content, "binary")
+    let content: Buffer
+    try {
+      const decoded = Buffer.from(file.content, "base64")
+      if (decoded.toString("base64") === file.content) {
+        content = decoded
+      } else {
+        content = Buffer.from(file.content, "utf8")
+      }
+    } catch {
+      // Last-resort fallback: binary
+      content = Buffer.from(file.content, "binary")
+    }
+
     const command = new PutObjectCommand({
       // We probably also want to support a separate bucket altogether for private files
       // protected private_bucket_: string