feat(stacks): support compose v2.0 stack (#1963)

api/http/handler/templates/template_list.go

@@ -0,0 +1,50 @@
+package templates
+
+import (
+	"io/ioutil"
+	"net/http"
+
+	httperror "github.com/portainer/portainer/http/error"
+	"github.com/portainer/portainer/http/request"
+	"github.com/portainer/portainer/http/response"
+)
+
+// GET request on /api/templates?key=<key>
+func (handler *Handler) templateList(w http.ResponseWriter, r *http.Request) *httperror.HandlerError {
+	key, err := request.RetrieveQueryParameter(r, "key", false)
+	if err != nil {
+		return &httperror.HandlerError{http.StatusBadRequest, "Invalid query parameter: key", err}
+	}
+
+	templatesURL, templateErr := handler.retrieveTemplateURLFromKey(key)
+	if templateErr != nil {
+		return templateErr
+	}
+
+	resp, err := http.Get(templatesURL)
+	if err != nil {
+		return &httperror.HandlerError{http.StatusInternalServerError, "Unable to retrieve templates via the network", err}
+	}
+	defer resp.Body.Close()
+
+	body, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return &httperror.HandlerError{http.StatusInternalServerError, "Unable to read template response", err}
+	}
+
+	return response.Bytes(w, body, "application/json")
+}
+
+func (handler *Handler) retrieveTemplateURLFromKey(key string) (string, *httperror.HandlerError) {
+	switch key {
+	case "containers":
+		settings, err := handler.SettingsService.Settings()
+		if err != nil {
+			return "", &httperror.HandlerError{http.StatusInternalServerError, "Unable to retrieve settings from the database", err}
+		}
+		return settings.TemplatesURL, nil
+	case "linuxserver.io":
+		return containerTemplatesURLLinuxServerIo, nil
+	}
+	return "", &httperror.HandlerError{http.StatusBadRequest, "Invalid value for query parameter: key. Value must be one of: containers or linuxserver.io", request.ErrInvalidQueryParameter}
+}