carloea2 commented on code in PR #4136:
URL: https://github.com/apache/texera/pull/4136#discussion_r2658822634


##########
file-service/src/main/scala/org/apache/texera/service/resource/DatasetResource.scala:
##########
@@ -1372,4 +1405,378 @@ class DatasetResource {
         Right(response)
     }
   }
+
+  // === Multipart helpers ===
+
+  private def getDatasetBy(ownerEmail: String, datasetName: String) = {
+    val dataset = context
+      .select(DATASET.fields: _*)
+      .from(DATASET)
+      .leftJoin(USER)
+      .on(USER.UID.eq(DATASET.OWNER_UID))
+      .where(USER.EMAIL.eq(ownerEmail))
+      .and(DATASET.NAME.eq(datasetName))
+      .fetchOneInto(classOf[Dataset])
+    if (dataset == null) {
+      throw new BadRequestException("Dataset not found")
+    }
+    dataset
+  }
+
+  private def validateFilePathOrThrow(filePath: String): String = {
+    val p = Option(filePath).getOrElse("")
+    val s = p.replace("\\", "/")
+    if (
+      p.isEmpty ||
+      s.startsWith("/") ||
+      s.split("/").exists(seg => seg == "." || seg == "..") ||
+      s.exists(ch => ch == 0.toChar || ch < 0x20.toChar || ch == 0x7f.toChar)
+    ) throw new BadRequestException("Invalid filePath")
+    p

Review Comment:
   Done



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