Migrate rest provider

provider/rest/rest.go

@@ -0,0 +1,67 @@
+package rest
+
+import (
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"net/http"
+
+	"github.com/containous/mux"
+	"github.com/containous/traefik/config"
+	"github.com/containous/traefik/log"
+	"github.com/containous/traefik/provider"
+	"github.com/containous/traefik/safe"
+	"github.com/unrolled/render"
+)
+
+var _ provider.Provider = (*Provider)(nil)
+
+// Provider is a provider.Provider implementation that provides a Rest API.
+type Provider struct {
+	configurationChan chan<- config.Message
+	EntryPoint        string `description:"EntryPoint" export:"true"`
+}
+
+var templatesRenderer = render.New(render.Options{Directory: "nowhere"})
+
+// Init the provider.
+func (p *Provider) Init() error {
+	return nil
+}
+
+// Append add rest provider routes on a router.
+func (p *Provider) Append(systemRouter *mux.Router) {
+	systemRouter.
+		Methods(http.MethodPut).
+		Path("/api/providers/{provider}").
+		HandlerFunc(func(response http.ResponseWriter, request *http.Request) {
+
+			vars := mux.Vars(request)
+			if vars["provider"] != "rest" {
+				response.WriteHeader(http.StatusBadRequest)
+				fmt.Fprint(response, "Only 'rest' provider can be updated through the REST API")
+				return
+			}
+
+			configuration := new(config.Configuration)
+			body, _ := ioutil.ReadAll(request.Body)
+			err := json.Unmarshal(body, configuration)
+			if err == nil {
+				p.configurationChan <- config.Message{ProviderName: "rest", Configuration: configuration}
+				err := templatesRenderer.JSON(response, http.StatusOK, configuration)
+				if err != nil {
+					log.WithoutContext().Error(err)
+				}
+			} else {
+				log.WithoutContext().Errorf("Error parsing configuration %+v", err)
+				http.Error(response, fmt.Sprintf("%+v", err), http.StatusBadRequest)
+			}
+		})
+}
+
+// Provide allows the provider to provide configurations to traefik
+// using the given configuration channel.
+func (p *Provider) Provide(configurationChan chan<- config.Message, pool *safe.Pool) error {
+	p.configurationChan = configurationChan
+	return nil
+}