2 files changed, 140 insertions, 0 deletions
diff --git a/src/orchestrator/utils/utils.go b/src/orchestrator/utils/utils.go
new file mode 100644
index 00000000..44cf5120
--- /dev/null
+++ b/src/orchestrator/utils/utils.go
@@ -0,0 +1,66 @@
+/*
+ * Copyright 2020 Intel Corporation, Inc
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package utils
+
+import (
+	"archive/tar"
+	"compress/gzip"
+	"io"
+
+	pkgerrors "github.com/pkg/errors"
+)
+
+func IsTarGz(r io.Reader) error {
+	//Check if it is a valid gz
+	gzf, err := gzip.NewReader(r)
+	if err != nil {
+		return pkgerrors.Wrap(err, "Invalid gzip format")
+	}
+
+	//Check if it is a valid tar file
+	//Unfortunately this can only be done by inspecting all the tar contents
+	tarR := tar.NewReader(gzf)
+	first := true
+
+	for true {
+		header, err := tarR.Next()
+
+		if err == io.EOF {
+			//Check if we have just a gzip file without a tar archive inside
+			if first {
+				return pkgerrors.New("Empty or non-existant Tar file found")
+			}
+			//End of archive
+			break
+		}
+
+		if err != nil {
+			return pkgerrors.Errorf("Error reading tar file %s", err.Error())
+		}
+
+		//Check if files are of type directory and regular file
+		if header.Typeflag != tar.TypeDir &&
+			header.Typeflag != tar.TypeReg {
+			return pkgerrors.Errorf("Unknown header in tar %s, %s",
+				header.Name, string(header.Typeflag))
+		}
+
+		first = false
+	}
+
+	return nil
+}
diff --git a/src/orchestrator/utils/utils_test.go b/src/orchestrator/utils/utils_test.go
new file mode 100644
index 00000000..63230e49
--- /dev/null
+++ b/src/orchestrator/utils/utils_test.go
@@ -0,0 +1,74 @@
+/*
+ * Copyright 2018 Intel Corporation, Inc
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package utils
+
+import (
+	"bytes"
+	"testing"
+)
+
+func TestIsTarGz(t *testing.T) {
+
+	t.Run("Valid tar.gz", func(t *testing.T) {
+		content := []byte{
+			0x1f, 0x8b, 0x08, 0x08, 0xb0, 0x6b, 0xf4, 0x5b,
+			0x00, 0x03, 0x74, 0x65, 0x73, 0x74, 0x2e, 0x74,
+			0x61, 0x72, 0x00, 0xed, 0xce, 0x41, 0x0a, 0xc2,
+			0x30, 0x10, 0x85, 0xe1, 0xac, 0x3d, 0x45, 0x4e,
+			0x50, 0x12, 0xd2, 0xc4, 0xe3, 0x48, 0xa0, 0x01,
+			0x4b, 0x52, 0x0b, 0xed, 0x88, 0x1e, 0xdf, 0x48,
+			0x11, 0x5c, 0x08, 0xa5, 0x8b, 0x52, 0x84, 0xff,
+			0xdb, 0xbc, 0x61, 0x66, 0x16, 0x4f, 0xd2, 0x2c,
+			0x8d, 0x3c, 0x45, 0xed, 0xc8, 0x54, 0x21, 0xb4,
+			0xef, 0xb4, 0x67, 0x6f, 0xbe, 0x73, 0x61, 0x9d,
+			0xb2, 0xce, 0xd5, 0x55, 0xf0, 0xde, 0xd7, 0x3f,
+			0xdb, 0xd6, 0x49, 0x69, 0xb3, 0x67, 0xa9, 0x8f,
+			0xfb, 0x2c, 0x71, 0xd2, 0x5a, 0xc5, 0xee, 0x92,
+			0x73, 0x8e, 0x43, 0x7f, 0x4b, 0x3f, 0xff, 0xd6,
+			0xee, 0x7f, 0xea, 0x9a, 0x4a, 0x19, 0x1f, 0xe3,
+			0x54, 0xba, 0xd3, 0xd1, 0x55, 0x00, 0x00, 0x00,
+			0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+			0x00, 0x00, 0x00, 0x1b, 0xbc, 0x00, 0xb5, 0xe8,
+			0x4a, 0xf9, 0x00, 0x28, 0x00, 0x00,
+		}
+
+		err := IsTarGz(bytes.NewBuffer(content))
+		if err != nil {
+			t.Errorf("Error reading valid tar.gz file %s", err.Error())
+		}
+	})
+
+	t.Run("Invalid tar.gz", func(t *testing.T) {
+		content := []byte{
+			0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00,
+			0x00, 0xff, 0xf2, 0x48, 0xcd,
+		}
+
+		err := IsTarGz(bytes.NewBuffer(content))
+		if err == nil {
+			t.Errorf("Error should NOT be nil")
+		}
+	})
+
+	t.Run("Empty tar.gz", func(t *testing.T) {
+		content := []byte{}
+		err := IsTarGz(bytes.NewBuffer(content))
+		if err == nil {
+			t.Errorf("Error should NOT be nil")
+		}
+	})
+}