Add apps under composite app API

Implemented create, get and delete
handlers for the apps under composite
app.

Added unit tests

Added remove function to mockdb

Handled multipart POST request to
upload file along with app data.

Issue-ID: MULTICLOUD-998
Signed-off-by: Srivahni Chivukula <srivahni.chivukula@intel.com>
Change-Id: I25c1faba1212c0cc881c2cd599e8e66a7b93033e

1 files changed, 224 insertions, 0 deletions

diff --git a/src/orchestrator/api/apphandler.go b/src/orchestrator/api/apphandler.go
new file mode 100644
index 00000000..3cd2dbc8
--- /dev/null
+++ b/src/orchestrator/api/apphandler.go
@@ -0,0 +1,224 @@
+/*
+ * 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 api
+
+import (
+	"bytes"
+	"encoding/base64"
+	"encoding/json"
+	"io"
+	"io/ioutil"
+	"mime"
+	"mime/multipart"
+	"net/http"
+	"net/textproto"
+
+	moduleLib "github.com/onap/multicloud-k8s/src/orchestrator/pkg/module"
+	"github.com/onap/multicloud-k8s/src/orchestrator/utils"
+
+	"github.com/gorilla/mux"
+)
+
+// appHandler to store backend implementations objects
+// Also simplifies mocking for unit testing purposes
+type appHandler struct {
+	// Interface that implements App operations
+	// We will set this variable with a mock interface for testing
+	client moduleLib.AppManager
+}
+
+// createAppHandler handles creation of the App entry in the database
+// This is a multipart handler. See following example curl request
+// curl -X POST http://localhost:9015/v2/projects/sampleProject/composite-apps/sampleCompositeApp/v1/apps \
+// -F "metadata={\"metadata\":{\"name\":\"app\",\"description\":\"sample app\",\"UserData1\":\"data1\",\"UserData2\":\"data2\"}};type=application/json" \
+// -F file=@/pathToFile
+
+func (h appHandler) createAppHandler(w http.ResponseWriter, r *http.Request) {
+	var a moduleLib.App
+	var ac moduleLib.AppContent
+
+	// Implemenation using multipart form
+	// Set Max size to 16mb here
+	err := r.ParseMultipartForm(16777216)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusUnprocessableEntity)
+		return
+	}
+
+	jsn := bytes.NewBuffer([]byte(r.FormValue("metadata")))
+	err = json.NewDecoder(jsn).Decode(&a)
+	switch {
+	case err == io.EOF:
+		http.Error(w, "Empty body", http.StatusBadRequest)
+		return
+	case err != nil:
+		http.Error(w, err.Error(), http.StatusUnprocessableEntity)
+		return
+	}
+
+	// Name is required.
+	if a.Metadata.Name == "" {
+		http.Error(w, "Missing name in POST request", http.StatusBadRequest)
+		return
+	}
+
+	//Read the file section and ignore the header
+	file, _, err := r.FormFile("file")
+	if err != nil {
+		http.Error(w, "Unable to process file", http.StatusUnprocessableEntity)
+		return
+	}
+
+	defer file.Close()
+
+	//Convert the file content to base64 for storage
+	content, err := ioutil.ReadAll(file)
+	if err != nil {
+		http.Error(w, "Unable to read file", http.StatusUnprocessableEntity)
+		return
+	}
+
+	err = utils.IsTarGz(bytes.NewBuffer(content))
+	if err != nil {
+		http.Error(w, "Error in file format", http.StatusUnprocessableEntity)
+		return
+	}
+
+	ac.FileContent = base64.StdEncoding.EncodeToString(content)
+
+	vars := mux.Vars(r)
+	projectName := vars["project-name"]
+	compositeAppName := vars["composite-app-name"]
+	compositeAppVersion := vars["version"]
+
+	ret, err := h.client.CreateApp(a, ac, projectName, compositeAppName, compositeAppVersion)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(http.StatusCreated)
+	err = json.NewEncoder(w).Encode(ret)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+}
+
+// getAppHandler handles GET operations on a particular App Name
+// Returns an app
+func (h appHandler) getAppHandler(w http.ResponseWriter, r *http.Request) {
+	vars := mux.Vars(r)
+	projectName := vars["project-name"]
+	compositeAppName := vars["composite-app-name"]
+	compositeAppVersion := vars["version"]
+	name := vars["app-name"]
+
+	accepted, _, err := mime.ParseMediaType(r.Header.Get("Accept"))
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusNotAcceptable)
+		return
+	}
+
+	var retApp moduleLib.App
+	var retAppContent moduleLib.AppContent
+
+	retApp, err = h.client.GetApp(name, projectName, compositeAppName, compositeAppVersion)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	retAppContent, err = h.client.GetAppContent(name, projectName, compositeAppName, compositeAppVersion)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	switch accepted {
+	case "multipart/form-data":
+		mpw := multipart.NewWriter(w)
+		w.Header().Set("Content-Type", mpw.FormDataContentType())
+		w.WriteHeader(http.StatusOK)
+		pw, err := mpw.CreatePart(textproto.MIMEHeader{"Content-Type": {"application/json"}, "Content-Disposition": {"form-data; name=metadata"}})
+		if err != nil {
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+			return
+		}
+		if err := json.NewEncoder(pw).Encode(retApp); err != nil {
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+			return
+		}
+		pw, err = mpw.CreatePart(textproto.MIMEHeader{"Content-Type": {"application/octet-stream"}, "Content-Disposition": {"form-data; name=file; filename=fileContent"}})
+		if err != nil {
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+			return
+		}
+		fcBytes, err := base64.StdEncoding.DecodeString(retAppContent.FileContent)
+		if err != nil {
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+			return
+		}
+		_, err = pw.Write(fcBytes)
+		if err != nil {
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+			return
+		}
+	case "application/json":
+		w.Header().Set("Content-Type", "application/json")
+		w.WriteHeader(http.StatusOK)
+		err = json.NewEncoder(w).Encode(retApp)
+		if err != nil {
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+			return
+		}
+	case "application/octet-stream":
+		w.Header().Set("Content-Type", "application/octet-stream")
+		w.WriteHeader(http.StatusOK)
+		fcBytes, err := base64.StdEncoding.DecodeString(retAppContent.FileContent)
+		if err != nil {
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+			return
+		}
+		_, err = w.Write(fcBytes)
+		if err != nil {
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+			return
+		}
+	default:
+		http.Error(w, "set Accept: multipart/form-data, application/json or application/octet-stream", http.StatusMultipleChoices)
+		return
+	}
+}
+
+// deleteAppHandler handles DELETE operations on a particular App Name
+func (h appHandler) deleteAppHandler(w http.ResponseWriter, r *http.Request) {
+	vars := mux.Vars(r)
+	projectName := vars["project-name"]
+	compositeAppName := vars["composite-app-name"]
+	compositeAppVersion := vars["version"]
+	name := vars["app-name"]
+
+	err := h.client.DeleteApp(name, projectName, compositeAppName, compositeAppVersion)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	w.WriteHeader(http.StatusNoContent)
+}