Add support for downloading content

Add support for downloading content for creating
the merged helm charts. This api will be used mainly
by the profile api to create a converged chart which
will then be created by the instantiation code
P2: Add unit tests for archive.go
    Add download method for profile.go
    Update comments for download method
P3: Add unit test for empty files
P4: Add unit tests for Download functions
P5: Rebase against new folder structure

Issue-ID: MULTICLOUD-291
Change-Id: I9779eaf95366f527f0360eaddea663722c13b196
Signed-off-by: Kiran Kamineni <kiran.k.kamineni@intel.com>

1 files changed, 71 insertions, 1 deletions

diff --git a/src/k8splugin/internal/rb/archive_test.go b/src/k8splugin/internal/rb/archive_test.go
index a327dfd4..5fa66e79 100644
--- a/src/k8splugin/internal/rb/archive_test.go
+++ b/src/k8splugin/internal/rb/archive_test.go
@@ -18,6 +18,9 @@ package rb
 
 import (
 	"bytes"
+	"io/ioutil"
+	"path/filepath"
+	"strings"
 	"testing"
 )
 
@@ -48,7 +51,7 @@ func TestIsTarGz(t *testing.T) {
 
 		err := isTarGz(bytes.NewBuffer(content))
 		if err != nil {
-			t.Errorf("Error reading valid Zip file %s", err.Error())
+			t.Errorf("Error reading valid tar.gz file %s", err.Error())
 		}
 	})
 
@@ -63,4 +66,71 @@ func TestIsTarGz(t *testing.T) {
 			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")
+		}
+	})
+}
+
+func TestExtractTarBall(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,
+		}
+
+		path, err := ExtractTarBall(bytes.NewBuffer(content))
+		if err != nil {
+			t.Errorf("Error reading valid tar.gz file %s", err.Error())
+		}
+		fcontent, err := ioutil.ReadFile(filepath.Join(path, "test.txt"))
+		if err != nil {
+			t.Errorf("Error reading content of valid tar.gz file %s", err.Error())
+		}
+		if strings.Contains(string(fcontent), "helloworld") == false {
+			t.Errorf("Incorrect content read from path: %s", path)
+		}
+	})
+
+	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 := ExtractTarBall(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")
+		}
+	})
 }