added real_ip and cloudflare_real_ip middlewares, fixed that some middlewares does not work properly

internal/net/http/middleware/middlewares.go

@@ -0,0 +1,47 @@
+package middleware
+
+import (
+	"fmt"
+	"strings"
+
+	D "github.com/yusing/go-proxy/internal/docker"
+)
+
+var middlewares map[string]*Middleware
+
+func Get(name string) (middleware *Middleware, ok bool) {
+	middleware, ok = middlewares[name]
+	return
+}
+
+// initialize middleware names and label parsers
+func init() {
+	middlewares = map[string]*Middleware{
+		"set_x_forwarded":    SetXForwarded,
+		"add_x_forwarded":    AddXForwarded,
+		"redirect_http":      RedirectHTTP,
+		"forward_auth":       ForwardAuth.m,
+		"modify_response":    ModifyResponse.m,
+		"modify_request":     ModifyRequest.m,
+		"error_page":         CustomErrorPage,
+		"custom_error_page":  CustomErrorPage,
+		"real_ip":            RealIP.m,
+		"cloudflare_real_ip": CloudflareRealIP.m,
+	}
+	names := make(map[*Middleware][]string)
+	for name, m := range middlewares {
+		names[m] = append(names[m], name)
+		// register middleware name to docker label parsr
+		// in order to parse middleware_name.option=value into correct type
+		if m.labelParserMap != nil {
+			D.RegisterNamespace(name, m.labelParserMap)
+		}
+	}
+	for m, names := range names {
+		if len(names) > 1 {
+			m.name = fmt.Sprintf("%s (a.k.a. %s)", names[0], strings.Join(names[1:], ", "))
+		} else {
+			m.name = names[0]
+		}
+	}
+}