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service.go
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service.go
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package specification
import (
"encoding/json"
"fmt"
"github.com/kyma-project/kyma/components/application-registry/internal/metadata/specification/assetstore"
"github.com/kyma-project/kyma/components/application-registry/internal/metadata/specification/assetstore/docstopic"
"github.com/kyma-project/kyma/components/application-registry/internal/metadata/specification/download"
"net/http"
"net/url"
"strings"
"time"
"github.com/go-openapi/spec"
"github.com/kyma-project/kyma/components/application-registry/internal/apperrors"
"github.com/kyma-project/kyma/components/application-registry/internal/metadata/model"
)
const (
oDataSpecFormat = "%s/$metadata"
oDataSpecType = "odata"
targetSwaggerVersion = "2.0"
)
type Service interface {
GetSpec(id string) ([]byte, []byte, []byte, apperrors.AppError)
RemoveSpec(id string) apperrors.AppError
PutSpec(serviceDef *model.ServiceDefinition, gatewayUrl string) apperrors.AppError
}
type specService struct {
assetStoreService assetstore.Service
downloadClient download.Client
}
func NewSpecService(assetStoreService assetstore.Service, specRequestTimeout int) Service {
return &specService{
assetStoreService: assetStoreService,
downloadClient: download.NewClient(&http.Client{
Timeout: time.Duration(specRequestTimeout) * time.Second,
}),
}
}
func (svc *specService) GetSpec(id string) ([]byte, []byte, []byte, apperrors.AppError) {
return svc.assetStoreService.Get(id)
}
func (svc *specService) RemoveSpec(id string) apperrors.AppError {
return svc.assetStoreService.Remove(id)
}
func (svc *specService) PutSpec(serviceDef *model.ServiceDefinition, gatewayUrl string) apperrors.AppError {
var apiSpec []byte
var err apperrors.AppError
if serviceDef.Api != nil {
apiSpec, err = svc.processAPISpecification(serviceDef.Api, gatewayUrl)
if err != nil {
return err
}
}
apiType := toApiSpecType(serviceDef.Api)
return svc.insertSpecs(serviceDef.ID, apiType, serviceDef.Documentation, apiSpec, serviceDef.Events)
}
func (svc *specService) insertSpecs(id string, apiType docstopic.ApiType, docs []byte, apiSpec []byte, events *model.Events) apperrors.AppError {
var eventsSpec []byte
if events != nil {
eventsSpec = events.Spec
}
err := svc.assetStoreService.Put(id, apiType, docs, apiSpec, eventsSpec)
if err != nil {
return apperrors.Internal("Inserting specs failed, %s", err.Error())
}
return nil
}
func (svc *specService) processAPISpecification(api *model.API, gatewayUrl string) ([]byte, apperrors.AppError) {
apiSpec := api.Spec
var err apperrors.AppError
if shouldFetchSpec(api) {
apiSpec, err = svc.fetchSpec(api)
if err != nil {
return nil, err
}
}
if shouldModifySpec(apiSpec, api.ApiType) {
apiSpec, err = modifyAPISpec(apiSpec, gatewayUrl)
if err != nil {
return nil, apperrors.Internal("Modifying API spec failed, %s", err.Error())
}
}
return apiSpec, nil
}
func shouldFetchSpec(api *model.API) bool {
return isNilOrEmpty(api.Spec) && (api.SpecificationUrl != "" || strings.ToLower(api.ApiType) == oDataSpecType)
}
func shouldModifySpec(apiSpec []byte, apiType string) bool {
return !isNilOrEmpty(apiSpec) && strings.ToLower(apiType) != oDataSpecType
}
func isNilOrEmpty(array []byte) bool {
return array == nil || len(array) == 0 || string(array) == "null"
}
func toApiSpecType(api *model.API) docstopic.ApiType {
if api == nil {
return docstopic.NoneApiType
}
if strings.ToLower(api.ApiType) == oDataSpecType {
return docstopic.ODataApiType
}
return docstopic.OpenApiType
}
func (svc *specService) fetchSpec(api *model.API) ([]byte, apperrors.AppError) {
specUrl, apperr := determineSpecUrl(api)
if apperr != nil {
return nil, apperr
}
return svc.downloadClient.Fetch(specUrl)
}
func determineSpecUrl(api *model.API) (string, apperrors.AppError) {
var specUrl *url.URL
var err error
if api.SpecificationUrl != "" {
specUrl, err = url.Parse(api.SpecificationUrl)
if err != nil {
return "", apperrors.Internal("Parsing specification url failed, %s", err.Error())
}
} else {
targetUrl := strings.TrimSuffix(api.TargetUrl, "/")
specUrl, err = url.Parse(fmt.Sprintf(oDataSpecFormat, targetUrl))
if err != nil {
return "", apperrors.Internal("Parsing OData specification url failed, %s", err.Error())
}
}
return specUrl.String(), nil
}
func modifyAPISpec(rawApiSpec []byte, gatewayUrl string) ([]byte, apperrors.AppError) {
if rawApiSpec == nil {
return rawApiSpec, nil
}
var apiSpec spec.Swagger
err := json.Unmarshal(rawApiSpec, &apiSpec)
if err != nil {
// API spec might have different type than JSON
return rawApiSpec, nil
}
if apiSpec.Swagger != targetSwaggerVersion {
return rawApiSpec, nil
}
newSpec, err := updateBaseUrl(apiSpec, gatewayUrl)
if err != nil {
return rawApiSpec, apperrors.Internal("Updating base url failed, %s", err.Error())
}
modifiedSpec, err := json.Marshal(newSpec)
if err != nil {
return rawApiSpec, apperrors.Internal("Marshalling updated API spec failed, %s", err.Error())
}
return modifiedSpec, nil
}
func updateBaseUrl(apiSpec spec.Swagger, gatewayUrl string) (spec.Swagger, apperrors.AppError) {
fullUrl, err := url.Parse(gatewayUrl)
if err != nil {
return spec.Swagger{}, apperrors.Internal("Failed to parse gateway URL, %s", err.Error())
}
apiSpec.Host = fullUrl.Hostname()
apiSpec.BasePath = ""
apiSpec.Schemes = []string{"http"}
return apiSpec, nil
}