feat: Add https tar.gz remote source for context

pkg/buildcontext/buildcontext.go

@@ -61,7 +61,7 @@ func GetBuildContext(srcContext string, opts BuildOptions) (BuildContext, error)
 			if util.ValidAzureBlobStorageHost(srcContext) {
 				return &AzureBlob{context: srcContext}, nil
 			}
-			return nil, errors.New("url provided for https context is not in a supported format, please use the https url for Azure Blob Storage")
+			return &HTTPSTar{context: srcContext}, nil
 		case TarBuildContextPrefix:
 			return &Tar{context: context}, nil
 		}

pkg/buildcontext/https.go

@@ -0,0 +1,79 @@
+/*
+Copyright 2018 Google LLC
+
+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 buildcontext
+
+import (
+	"fmt"
+	"io"
+	"net/http"
+	"os"
+	"path/filepath"
+
+	"github.com/GoogleContainerTools/kaniko/pkg/constants"
+	"github.com/GoogleContainerTools/kaniko/pkg/util"
+	"github.com/sirupsen/logrus"
+)
+
+// HTTPSTar struct for https tar.gz files processing
+type HTTPSTar struct {
+	context string
+}
+
+// UnpackTarFromBuildContext downloads context file from https server
+func (h *HTTPSTar) UnpackTarFromBuildContext() (directory string, err error) {
+
+	logrus.Info("Retrieving https tar file")
+
+	// Create directory and target file for downloading the context file
+	directory = constants.BuildContextDir
+	tarPath := filepath.Join(directory, constants.ContextTar)
+	file, err := util.CreateTargetTarfile(tarPath)
+	if err != nil {
+		return
+	}
+
+	// Download tar file from remote https server
+	// and save it into the target tar file
+	resp, err := http.Get(h.context)
+	if err != nil {
+		return
+	}
+	defer func() {
+		if closeErr := resp.Body.Close(); err == nil && closeErr != nil {
+			err = closeErr
+		}
+	}()
+
+	if resp.StatusCode != http.StatusOK {
+		return directory, fmt.Errorf("HTTPSTar bad status from server: %s", resp.Status)
+	}
+
+	if _, err = io.Copy(file, resp.Body); err != nil {
+		return tarPath, err
+	}
+
+	logrus.Info("Retrieved https tar file")
+
+	if err = util.UnpackCompressedTar(tarPath, directory); err != nil {
+		return
+	}
+
+	logrus.Info("Extracted https tar file")
+
+	// Remove the tar so it doesn't interfere with subsequent commands
+	return directory, os.Remove(tarPath)
+}

pkg/buildcontext/https_test.go

@@ -0,0 +1,68 @@
+/*
+Copyright 2018 Google LLC
+
+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 buildcontext
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"testing"
+)
+
+func TestBuildWithHttpsTar(t *testing.T) {
+
+	tests := []struct {
+		name          string
+		serverHandler http.HandlerFunc
+	}{
+		{
+			name: "test http bad status",
+			serverHandler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+				w.WriteHeader(http.StatusBadRequest)
+				_, err := w.Write([]byte("corrupted message"))
+				if err != nil {
+					t.Fatalf("Error sending response: %v", err)
+				}
+			}),
+		},
+		{
+			name: "test http bad data",
+			serverHandler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+				w.WriteHeader(http.StatusOK)
+				_, err := w.Write([]byte("corrupted message"))
+				if err != nil {
+					t.Fatalf("Error sending response: %v", err)
+				}
+			}),
+		},
+	}
+
+	for _, tcase := range tests {
+		t.Run(tcase.name, func(t *testing.T) {
+			server := httptest.NewServer(tcase.serverHandler)
+			defer server.Close()
+
+			context := &HTTPSTar{
+				context: server.URL + "/data.tar.gz",
+			}
+
+			_, err := context.UnpackTarFromBuildContext()
+			if err == nil {
+				t.Fatalf("Error expected but not returned: %s", err)
+			}
+		})
+	}
+}