add caddyfile implementation

Signed-off-by: Mohammed Al Sahaf <msaa1990@gmail.com>

caddytest/integration/caddyfile_adapt/reverse_proxy_http_transport_none_proxy.txt

@@ -0,0 +1,40 @@
+:8884
+reverse_proxy 127.0.0.1:65535 {
+	transport http {
+		forward_proxy none
+	}
+}
+----------
+{
+	"apps": {
+		"http": {
+			"servers": {
+				"srv0": {
+					"listen": [
+						":8884"
+					],
+					"routes": [
+						{
+							"handle": [
+								{
+									"handler": "reverse_proxy",
+									"transport": {
+										"network_proxy": {
+											"from": "none"
+										},
+										"protocol": "http"
+									},
+									"upstreams": [
+										{
+											"dial": "127.0.0.1:65535"
+										}
+									]
+								}
+							]
+						}
+					]
+				}
+			}
+		}
+	}
+}

caddytest/integration/caddyfile_adapt/reverse_proxy_http_transport_url_proxy.txt

@@ -0,0 +1,41 @@
+:8884
+reverse_proxy 127.0.0.1:65535 {
+	transport http {
+		forward_proxy url http://localhost:8080
+	}
+}
+----------
+{
+	"apps": {
+		"http": {
+			"servers": {
+				"srv0": {
+					"listen": [
+						":8884"
+					],
+					"routes": [
+						{
+							"handle": [
+								{
+									"handler": "reverse_proxy",
+									"transport": {
+										"network_proxy": {
+											"from": "url",
+											"url": "http://localhost:8080"
+										},
+										"protocol": "http"
+									},
+									"upstreams": [
+										{
+											"dial": "127.0.0.1:65535"
+										}
+									]
+								}
+							]
+						}
+					]
+				}
+			}
+		}
+	}
+}

modules/caddyhttp/reverseproxy/caddyfile.go

@@ -1074,6 +1074,22 @@ func (h *HTTPTransport) UnmarshalCaddyfile(d *caddyfile.Dispenser) error {
 			}
 			h.ForwardProxyURL = d.Val()
 
+		case "forward_proxy":
+			if !d.NextArg() {
+				return d.ArgErr()
+			}
+			modStem := d.Val()
+			modID := "caddy.network_proxy.source." + modStem
+			unm, err := caddyfile.UnmarshalModule(d, modID)
+			if err != nil {
+				return err
+			}
+			// TODO: should we validate here?
+			// ca, ok := unm.(caddy.ProxyFuncProducer)
+			// if !ok {
+			// 	return d.Errf("module %s is not a caddy.ProxyFuncProducer", modID)
+			// }
+			h.NetworkProxyRaw = caddyconfig.JSONModuleObject(unm, "from", modStem, nil)
 		case "dial_timeout":
 			if !d.NextArg() {
 				return d.ArgErr()

modules/caddytls/proxy.go

@@ -0,0 +1,3 @@
+package caddytls
+
+import _ "github.com/caddyserver/caddy/v2/modules/internal/network"

modules/internal/network/networkproxy.go

@@ -1,4 +1,4 @@
-package standard
+package network
 
 import (
 	"errors"
@@ -9,28 +9,12 @@ import (
 	"go.uber.org/zap"
 
 	"github.com/caddyserver/caddy/v2"
+	"github.com/caddyserver/caddy/v2/caddyconfig/caddyfile"
 )
 
 func init() {
-	caddy.RegisterModule(ProxyFromEnvironment{})
 	caddy.RegisterModule(ProxyFromURL{})
-}
-
-type ProxyFromEnvironment struct{}
-
-// ProxyFunc implements ProxyFuncProducer.
-func (p ProxyFromEnvironment) ProxyFunc() func(*http.Request) (*url.URL, error) {
-	return http.ProxyFromEnvironment
-}
-
-// CaddyModule implements Module.
-func (p ProxyFromEnvironment) CaddyModule() caddy.ModuleInfo {
-	return caddy.ModuleInfo{
-		ID: "caddy.network_proxy.source.environment",
-		New: func() caddy.Module {
-			return ProxyFromEnvironment{}
-		},
-	}
+	caddy.RegisterModule(ProxyFromNone{})
 }
 
 type ProxyFromURL struct {
@@ -111,16 +95,48 @@ func (p ProxyFromURL) ProxyFunc() func(*http.Request) (*url.URL, error) {
 			return pUrl, err
 		}
 	}
-	return func(*http.Request) (*url.URL, error) {
+	return func(r *http.Request) (*url.URL, error) {
 		return url.Parse(p.URL)
 	}
 }
 
+// UnmarshalCaddyfile implements caddyfile.Unmarshaler.
+func (p *ProxyFromURL) UnmarshalCaddyfile(d *caddyfile.Dispenser) error {
+	d.Next()
+	d.Next()
+	p.URL = d.Val()
+	return nil
+}
+
+type ProxyFromNone struct{}
+
+func (p ProxyFromNone) CaddyModule() caddy.ModuleInfo {
+	return caddy.ModuleInfo{
+		ID: "caddy.network_proxy.source.none",
+		New: func() caddy.Module {
+			return &ProxyFromNone{}
+		},
+	}
+}
+
+// UnmarshalCaddyfile implements caddyfile.Unmarshaler.
+func (p ProxyFromNone) UnmarshalCaddyfile(d *caddyfile.Dispenser) error {
+	return nil
+}
+
+// ProxyFunc implements ProxyFuncProducer.
+func (p ProxyFromNone) ProxyFunc() func(*http.Request) (*url.URL, error) {
+	return nil
+}
+
 var (
-	_ caddy.Module            = ProxyFromEnvironment{}
-	_ caddy.ProxyFuncProducer = ProxyFromEnvironment{}
 	_ caddy.Module            = ProxyFromURL{}
 	_ caddy.Provisioner       = &ProxyFromURL{}
 	_ caddy.Validator         = ProxyFromURL{}
 	_ caddy.ProxyFuncProducer = ProxyFromURL{}
+	_ caddyfile.Unmarshaler   = &ProxyFromURL{}
+
+	_ caddy.Module            = ProxyFromNone{}
+	_ caddy.ProxyFuncProducer = ProxyFromNone{}
+	_ caddyfile.Unmarshaler   = ProxyFromNone{}
 )