added json supporting to DownloadIndexFile

Signed-off-by: Seyed Mohammad Mahdi Hatami <hatamik7@gmail.com>

pkg/repo/chartrepo.go

@@ -98,7 +98,7 @@ func (r *ChartRepository) Load() error {
 	// what repos to use?
 	filepath.Walk(r.Config.Name, func(path string, f os.FileInfo, err error) error {
 		if !f.IsDir() {
-			if strings.Contains(f.Name(), "-index.yaml") {
+			if strings.Contains(f.Name(), "-index.json") || strings.Contains(f.Name(), "-index.yaml") {
 				i, err := LoadIndexFile(path)
 				if err != nil {
 					return err
@@ -115,12 +115,16 @@ func (r *ChartRepository) Load() error {
 
 // DownloadIndexFile fetches the index from a repository.
 func (r *ChartRepository) DownloadIndexFile() (string, error) {
-	indexURL, err := ResolveReferenceURL(r.Config.URL, "index.yaml")
+	jsonIndexURL, err := ResolveReferenceURL(r.Config.URL, "index.json")
+	if err != nil {
+		return "", err
+	}
+	yamlIndexURL, err := ResolveReferenceURL(r.Config.URL, "index.yaml")
 	if err != nil {
 		return "", err
 	}
 
-	resp, err := r.Client.Get(indexURL,
+	resp, err := r.Client.Get(jsonIndexURL,
 		getter.WithURL(r.Config.URL),
 		getter.WithInsecureSkipVerifyTLS(r.Config.InsecureSkipTLSverify),
 		getter.WithTLSClientConfig(r.Config.CertFile, r.Config.KeyFile, r.Config.CAFile),
@@ -136,11 +140,30 @@ func (r *ChartRepository) DownloadIndexFile() (string, error) {
 		return "", err
 	}
 
-	indexFile, err := loadIndex(index, r.Config.URL)
+	indexFile, err := loadIndex(index, jsonIndexURL)
+	if err != nil {
+		resp, err = r.Client.Get(yamlIndexURL,
+			getter.WithURL(r.Config.URL),
+			getter.WithInsecureSkipVerifyTLS(r.Config.InsecureSkipTLSverify),
+			getter.WithTLSClientConfig(r.Config.CertFile, r.Config.KeyFile, r.Config.CAFile),
+			getter.WithBasicAuth(r.Config.Username, r.Config.Password),
+			getter.WithPassCredentialsAll(r.Config.PassCredentialsAll),
+		)
 		if err != nil {
 			return "", err
 		}
 
+		index, err = io.ReadAll(resp)
+		if err != nil {
+			return "", err
+		}
+
+		indexFile, err = loadIndex(index, yamlIndexURL)
+		if err != nil {
+			return "", err
+		}
+	}
+
 	// Create the chart list file in the cache directory
 	var charts strings.Builder
 	for name := range indexFile.Entries {

pkg/repo/index.go

@@ -52,6 +52,8 @@ var (
 	ErrNoChartName = errors.New("no chart name found")
 	// ErrEmptyIndexYaml indicates that the content of index.yaml is empty.
 	ErrEmptyIndexYaml = errors.New("empty index.yaml file")
+	// ErrEmptyIndexJson indicates that the content of index.json is empty.
+	ErrEmptyIndexJson = errors.New("empty index.json file")
 )
 
 // ChartVersions is a list of versioned chart references.
@@ -332,14 +334,18 @@ func IndexDirectory(dir, baseURL string) (*IndexFile, error) {
 // This will fail if API Version is not set (ErrNoAPIVersion) or if the unmarshal fails.
 func loadIndex(data []byte, source string) (*IndexFile, error) {
 	i := &IndexFile{}
+	isjson := strings.HasSuffix(source, ".json")
 
 	// TODO : add error for empty json
 	if len(data) == 0 {
+		if isjson {
+			return i, ErrEmptyIndexJson
+		} else {
 			return i, ErrEmptyIndexYaml
 		}
+	}
 
-	// TODO : check file type, if json, unmarshal with json.
-	if strings.HasSuffix(source, ".json") {
+	if isjson {
 		if err := json.Unmarshal(data, i); err != nil {
 			return i, err
 		}