Refactor invoker management

Issue-ID: NONRTRIC-814
Signed-off-by: elinuxhenrik <henrik.b.andersson@est.tech>
Change-Id: I645cce6b25b0455d23d12e9b2e00234b20ef6bf9
diff --git a/capifcore/internal/invokermanagement/invokermanagement.go b/capifcore/internal/invokermanagement/invokermanagement.go
index 9025f83..5fa5ce6 100644
--- a/capifcore/internal/invokermanagement/invokermanagement.go
+++ b/capifcore/internal/invokermanagement/invokermanagement.go
@@ -21,10 +21,10 @@
 package invokermanagement
 
 import (
+	"errors"
+	"fmt"
 	"net/http"
 	"path"
-	"strconv"
-	"strings"
 	"sync"
 
 	"oransc.org/nonrtric/capifcore/internal/eventsapi"
@@ -103,14 +103,13 @@
 // Creates a new individual API Invoker profile.
 func (im *InvokerManager) PostOnboardedInvokers(ctx echo.Context) error {
 	var newInvoker invokerapi.APIInvokerEnrolmentDetails
-	err := ctx.Bind(&newInvoker)
-	if err != nil {
-		return sendCoreError(ctx, http.StatusBadRequest, "Invalid format for invoker")
+	errMsg := "Unable to onboard invoker due to %s"
+	if err := ctx.Bind(&newInvoker); err != nil {
+		return sendCoreError(ctx, http.StatusBadRequest, fmt.Sprintf(errMsg, "invalid format for invoker"))
 	}
 
-	shouldReturn, coreError := im.validateInvoker(newInvoker, ctx)
-	if shouldReturn {
-		return coreError
+	if err := im.validateInvoker(newInvoker, ctx); err != nil {
+		return sendCoreError(ctx, http.StatusBadRequest, fmt.Sprintf(errMsg, err))
 	}
 
 	im.prepareNewInvoker(&newInvoker)
@@ -119,7 +118,7 @@
 
 	uri := ctx.Request().Host + ctx.Request().URL.String()
 	ctx.Response().Header().Set(echo.HeaderLocation, ctx.Scheme()+`://`+path.Join(uri, *newInvoker.ApiInvokerId))
-	err = ctx.JSON(http.StatusCreated, newInvoker)
+	err := ctx.JSON(http.StatusCreated, newInvoker)
 	if err != nil {
 		// Something really bad happened, tell Echo that our handler failed
 		return err
@@ -129,26 +128,15 @@
 }
 
 func (im *InvokerManager) prepareNewInvoker(newInvoker *invokerapi.APIInvokerEnrolmentDetails) {
-	im.lock.Lock()
-	defer im.lock.Unlock()
-
-	newInvoker.ApiInvokerId = im.getId(newInvoker.ApiInvokerInformation)
-	newInvoker.OnboardingInformation.OnboardingSecret = getOnboardingSecret(*newInvoker)
-
 	var apiList invokerapi.APIList = im.publishRegister.GetAllPublishedServices()
 	newInvoker.ApiList = &apiList
 
-	im.onboardedInvokers[*newInvoker.ApiInvokerId] = *newInvoker
-}
+	im.lock.Lock()
+	defer im.lock.Unlock()
 
-func getOnboardingSecret(newInvoker invokerapi.APIInvokerEnrolmentDetails) *string {
-	onboardingSecret := "onboarding_secret_"
-	if newInvoker.ApiInvokerInformation != nil {
-		onboardingSecret = onboardingSecret + strings.ReplaceAll(*newInvoker.ApiInvokerInformation, " ", "_")
-	} else {
-		onboardingSecret = onboardingSecret + *newInvoker.ApiInvokerId
-	}
-	return &onboardingSecret
+	newInvoker.PrepareNewInvoker()
+
+	im.onboardedInvokers[*newInvoker.ApiInvokerId] = *newInvoker
 }
 
 // Deletes an individual API Invoker.
@@ -171,18 +159,17 @@
 // Updates an individual API invoker details.
 func (im *InvokerManager) PutOnboardedInvokersOnboardingId(ctx echo.Context, onboardingId string) error {
 	var invoker invokerapi.APIInvokerEnrolmentDetails
-	err := ctx.Bind(&invoker)
-	if err != nil {
-		return sendCoreError(ctx, http.StatusBadRequest, "Invalid format for invoker")
+	errMsg := "Unable to update invoker due to %s"
+	if err := ctx.Bind(&invoker); err != nil {
+		return sendCoreError(ctx, http.StatusBadRequest, fmt.Sprintf(errMsg, "invalid format for invoker"))
 	}
 
 	if onboardingId != *invoker.ApiInvokerId {
-		return sendCoreError(ctx, http.StatusBadRequest, "Invoker ApiInvokerId not matching")
+		return sendCoreError(ctx, http.StatusBadRequest, fmt.Sprintf(errMsg, "ApiInvokerId not matching"))
 	}
 
-	shouldReturn, coreError := im.validateInvoker(invoker, ctx)
-	if shouldReturn {
-		return coreError
+	if err := im.validateInvoker(invoker, ctx); err != nil {
+		return sendCoreError(ctx, http.StatusBadRequest, fmt.Sprintf(errMsg, err))
 	}
 
 	if _, ok := im.onboardedInvokers[onboardingId]; ok {
@@ -191,7 +178,7 @@
 		return sendCoreError(ctx, http.StatusNotFound, "The invoker to update has not been onboarded")
 	}
 
-	err = ctx.JSON(http.StatusOK, invoker)
+	err := ctx.JSON(http.StatusOK, invoker)
 	if err != nil {
 		// Something really bad happened, tell Echo that our handler failed
 		return err
@@ -210,20 +197,15 @@
 	return ctx.NoContent(http.StatusNotImplemented)
 }
 
-func (im *InvokerManager) validateInvoker(invoker invokerapi.APIInvokerEnrolmentDetails, ctx echo.Context) (bool, error) {
-	if invoker.NotificationDestination == "" {
-		return true, sendCoreError(ctx, http.StatusBadRequest, "Invoker missing required NotificationDestination")
+func (im *InvokerManager) validateInvoker(invoker invokerapi.APIInvokerEnrolmentDetails, ctx echo.Context) error {
+	if err := invoker.Validate(); err != nil {
+		return err
 	}
-
-	if invoker.OnboardingInformation.ApiInvokerPublicKey == "" {
-		return true, sendCoreError(ctx, http.StatusBadRequest, "Invoker missing required OnboardingInformation.ApiInvokerPublicKey")
-	}
-
 	if !im.areAPIsPublished(invoker.ApiList) {
-		return true, sendCoreError(ctx, http.StatusBadRequest, "Some APIs needed by invoker are not registered")
+		return errors.New("some APIs needed by invoker are not registered")
 	}
 
-	return false, nil
+	return nil
 }
 
 func (im *InvokerManager) areAPIsPublished(apis *invokerapi.APIList) bool {
@@ -233,17 +215,6 @@
 	return im.publishRegister.AreAPIsPublished((*[]publishapi.ServiceAPIDescription)(apis))
 }
 
-func (im *InvokerManager) getId(invokerInfo *string) *string {
-	idAsString := "api_invoker_id_"
-	if invokerInfo != nil {
-		idAsString = idAsString + strings.ReplaceAll(*invokerInfo, " ", "_")
-	} else {
-		idAsString = idAsString + strconv.FormatInt(im.nextId, 10)
-		im.nextId = im.nextId + 1
-	}
-	return &idAsString
-}
-
 func (im *InvokerManager) sendEvent(invokerId string, eventType eventsapi.CAPIFEvent) {
 	invokerIds := []string{invokerId}
 	event := eventsapi.EventNotification{
diff --git a/capifcore/internal/invokermanagement/invokermanagement_test.go b/capifcore/internal/invokermanagement/invokermanagement_test.go
index 4613cc4..d3c386c 100644
--- a/capifcore/internal/invokermanagement/invokermanagement_test.go
+++ b/capifcore/internal/invokermanagement/invokermanagement_test.go
@@ -80,7 +80,7 @@
 	assert.True(t, invokerUnderTest.VerifyInvokerSecret(wantedInvokerId, wantedInvokerSecret))
 	publishRegisterMock.AssertCalled(t, "GetAllPublishedServices")
 	assert.Equal(t, invokermanagementapi.APIList(publishedServices), *resultInvoker.ApiList)
-	if invokerEvent, ok := waitForEvent(eventChannel, 1*time.Second); ok {
+	if invokerEvent, timeout := waitForEvent(eventChannel, 1*time.Second); timeout {
 		assert.Fail(t, "No event sent")
 	} else {
 		assert.Equal(t, *resultInvoker.ApiInvokerId, (*invokerEvent.EventDetail.ApiInvokerIds)[0])
@@ -138,7 +138,7 @@
 
 	assert.Equal(t, http.StatusNoContent, result.Code())
 	assert.False(t, invokerUnderTest.IsInvokerRegistered(invokerId))
-	if invokerEvent, ok := waitForEvent(eventChannel, 1*time.Second); ok {
+	if invokerEvent, timeout := waitForEvent(eventChannel, 1*time.Second); timeout {
 		assert.Fail(t, "No event sent")
 	} else {
 		assert.Equal(t, invokerId, (*invokerEvent.EventDetail.ApiInvokerIds)[0])
@@ -220,7 +220,7 @@
 	assert.Contains(t, *problemDetails.Cause, "not matching")
 	assert.Contains(t, *problemDetails.Cause, "ApiInvokerId")
 
-	// Update an invoker that has not been onboarded, shold get 404 with problem details
+	// Update an invoker that has not been onboarded, should get 404 with problem details
 	missingId := "1"
 	invoker.ApiInvokerId = &missingId
 	result = testutil.NewRequest().Put("/onboardedInvokers/"+missingId).WithJsonBody(invoker).Go(t, requestHandler)
diff --git a/capifcore/internal/invokermanagementapi/typeupdate.go b/capifcore/internal/invokermanagementapi/typeupdate.go
new file mode 100644
index 0000000..1de6280
--- /dev/null
+++ b/capifcore/internal/invokermanagementapi/typeupdate.go
@@ -0,0 +1,59 @@
+// -
+//   ========================LICENSE_START=================================
+//   O-RAN-SC
+//   %%
+//   Copyright (C) 2023: Nordix Foundation
+//   %%
+//   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.
+//   ========================LICENSE_END===================================
+//
+
+package invokermanagementapi
+
+import (
+	"strings"
+
+	"github.com/google/uuid"
+)
+
+var uuidFunc = getUUID
+
+func (ied *APIInvokerEnrolmentDetails) PrepareNewInvoker() {
+	ied.createId()
+	ied.getOnboardingSecret()
+
+}
+
+func (ied *APIInvokerEnrolmentDetails) createId() {
+	idAsString := "api_invoker_id_"
+	if ied.ApiInvokerInformation != nil {
+		idAsString = idAsString + strings.ReplaceAll(*ied.ApiInvokerInformation, " ", "_")
+	} else {
+		idAsString = idAsString + uuidFunc()
+	}
+	ied.ApiInvokerId = &idAsString
+}
+
+func getUUID() string {
+	return uuid.NewString()
+}
+
+func (ied *APIInvokerEnrolmentDetails) getOnboardingSecret() {
+	onboardingSecret := "onboarding_secret_"
+	if ied.ApiInvokerInformation != nil {
+		onboardingSecret = onboardingSecret + strings.ReplaceAll(*ied.ApiInvokerInformation, " ", "_")
+	} else {
+		onboardingSecret = onboardingSecret + *ied.ApiInvokerId
+	}
+	ied.OnboardingInformation.OnboardingSecret = &onboardingSecret
+}
diff --git a/capifcore/internal/invokermanagementapi/typeupdate_test.go b/capifcore/internal/invokermanagementapi/typeupdate_test.go
new file mode 100644
index 0000000..5128d5f
--- /dev/null
+++ b/capifcore/internal/invokermanagementapi/typeupdate_test.go
@@ -0,0 +1,44 @@
+// -
+//   ========================LICENSE_START=================================
+//   O-RAN-SC
+//   %%
+//   Copyright (C) 2023: Nordix Foundation
+//   %%
+//   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.
+//   ========================LICENSE_END===================================
+//
+
+package invokermanagementapi
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestPrepareNewInvoker(t *testing.T) {
+	invokerUnderTest := APIInvokerEnrolmentDetails{}
+	uuidFunc = func() string {
+		return "1"
+	}
+
+	invokerUnderTest.PrepareNewInvoker()
+	assert.Equal(t, "api_invoker_id_1", *invokerUnderTest.ApiInvokerId)
+	assert.Equal(t, "onboarding_secret_api_invoker_id_1", *invokerUnderTest.OnboardingInformation.OnboardingSecret)
+
+	invokerInfo := "invoker info"
+	invokerUnderTest.ApiInvokerInformation = &invokerInfo
+	invokerUnderTest.PrepareNewInvoker()
+	assert.Equal(t, "api_invoker_id_invoker_info", *invokerUnderTest.ApiInvokerId)
+	assert.Equal(t, "onboarding_secret_invoker_info", *invokerUnderTest.OnboardingInformation.OnboardingSecret)
+}
diff --git a/capifcore/internal/invokermanagementapi/typevalidation.go b/capifcore/internal/invokermanagementapi/typevalidation.go
new file mode 100644
index 0000000..b12ddfb
--- /dev/null
+++ b/capifcore/internal/invokermanagementapi/typevalidation.go
@@ -0,0 +1,37 @@
+// -
+//   ========================LICENSE_START=================================
+//   O-RAN-SC
+//   %%
+//   Copyright (C) 2023: Nordix Foundation
+//   %%
+//   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.
+//   ========================LICENSE_END===================================
+//
+
+package invokermanagementapi
+
+import (
+	"errors"
+)
+
+func (ied *APIInvokerEnrolmentDetails) Validate() error {
+	if ied.NotificationDestination == "" {
+		return errors.New("APIInvokerEnrolmentDetails missing required NotificationDestination")
+	}
+
+	if ied.OnboardingInformation.ApiInvokerPublicKey == "" {
+		return errors.New("APIInvokerEnrolmentDetails missing required OnboardingInformation.ApiInvokerPublicKey")
+	}
+
+	return nil
+}
diff --git a/capifcore/internal/invokermanagementapi/typevalidation_test.go b/capifcore/internal/invokermanagementapi/typevalidation_test.go
new file mode 100644
index 0000000..60e4ee5
--- /dev/null
+++ b/capifcore/internal/invokermanagementapi/typevalidation_test.go
@@ -0,0 +1,48 @@
+// -
+//   ========================LICENSE_START=================================
+//   O-RAN-SC
+//   %%
+//   Copyright (C) 2023: Nordix Foundation
+//   %%
+//   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.
+//   ========================LICENSE_END===================================
+//
+
+package invokermanagementapi
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestValidateInvoker(t *testing.T) {
+	invokerUnderTest := APIInvokerEnrolmentDetails{}
+
+	err := invokerUnderTest.Validate()
+	if assert.Error(t, err) {
+		assert.Contains(t, err.Error(), "missing")
+		assert.Contains(t, err.Error(), "NotificationDestination")
+	}
+
+	invokerUnderTest.NotificationDestination = "destination"
+	err = invokerUnderTest.Validate()
+	if assert.Error(t, err) {
+		assert.Contains(t, err.Error(), "missing")
+		assert.Contains(t, err.Error(), "OnboardingInformation.ApiInvokerPublicKey")
+	}
+
+	invokerUnderTest.OnboardingInformation.ApiInvokerPublicKey = "key"
+	err = invokerUnderTest.Validate()
+	assert.Nil(t, err)
+}