add web api

pkg/api/config.go

@@ -0,0 +1,53 @@
+package api
+
+import (
+	"bytes"
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+	"github.com/go-gost/gost/pkg/config"
+)
+
+// swagger:parameters getConfigRequest
+type getConfigRequest struct {
+	// output format, one of yaml|json, default is json.
+	// in: query
+	Format string `form:"format" json:"format"`
+}
+
+// successful operation.
+// swagger:response getConfigResponse
+type getConfigResponse struct {
+	Config *config.Config
+}
+
+func getConfig(ctx *gin.Context) {
+	// swagger:route GET /config ConfigManagement getConfigRequest
+	//
+	// Get current config.
+	//
+	//     Responses:
+	//       200: getConfigResponse
+
+	var req getConfigRequest
+	ctx.ShouldBindQuery(&req)
+
+	var resp getConfigResponse
+	resp.Config = config.Global()
+
+	buf := &bytes.Buffer{}
+	switch req.Format {
+	case "yaml":
+	default:
+		req.Format = "json"
+	}
+
+	resp.Config.Write(buf, req.Format)
+
+	contentType := "application/json"
+	if req.Format == "yaml" {
+		contentType = "text/x-yaml"
+	}
+
+	ctx.Data(http.StatusOK, contentType, buf.Bytes())
+}