add HTTP plugin

admission/plugin.go

@@ -1,12 +1,16 @@
 package admission
 
 import (
+	"bytes"
 	"context"
+	"encoding/json"
 	"io"
+	"net/http"
 
-	admission_pkg "github.com/go-gost/core/admission"
+	"github.com/go-gost/core/admission"
 	"github.com/go-gost/core/logger"
 	"github.com/go-gost/plugin/admission/proto"
+	"github.com/go-gost/x/internal/util/plugin"
 	"google.golang.org/grpc"
 )
 
@@ -17,13 +21,24 @@ type grpcPluginAdmission struct {
 }
 
 // NewGRPCPluginAdmission creates an Admission plugin based on gRPC.
-func NewGRPCPluginAdmission(name string, conn grpc.ClientConnInterface) admission_pkg.Admission {
+func NewGRPCPluginAdmission(name string, addr string, opts ...plugin.Option) admission.Admission {
+	var options plugin.Options
+	for _, opt := range opts {
+		opt(&options)
+	}
+
+	log := logger.Default().WithFields(map[string]any{
+		"kind":      "admission",
+		"admission": name,
+	})
+	conn, err := plugin.NewGRPCConn(addr, &options)
+	if err != nil {
+		log.Error(err)
+	}
+
 	p := &grpcPluginAdmission{
 		conn: conn,
-		log: logger.Default().WithFields(map[string]any{
-			"kind":      "admission",
-			"admission": name,
-		}),
+		log:  log,
 	}
 	if conn != nil {
 		p.client = proto.NewAdmissionClient(conn)
@@ -53,3 +68,75 @@ func (p *grpcPluginAdmission) Close() error {
 	}
 	return nil
 }
+
+type httpAdmissionRequest struct {
+	Addr string `json:"addr"`
+}
+
+type httpAdmissionResponse struct {
+	OK bool `json:"ok"`
+}
+
+type httpPluginAdmission struct {
+	url    string
+	client *http.Client
+	header http.Header
+	log    logger.Logger
+}
+
+// NewHTTPPluginAdmission creates an Admission plugin based on HTTP.
+func NewHTTPPluginAdmission(name string, url string, opts ...plugin.Option) admission.Admission {
+	var options plugin.Options
+	for _, opt := range opts {
+		opt(&options)
+	}
+
+	return &httpPluginAdmission{
+		url:    url,
+		client: plugin.NewHTTPClient(&options),
+		header: options.Header,
+		log: logger.Default().WithFields(map[string]any{
+			"kind":      "admission",
+			"admission": name,
+		}),
+	}
+}
+
+func (p *httpPluginAdmission) Admit(ctx context.Context, addr string) (ok bool) {
+	if p.client == nil {
+		return
+	}
+
+	rb := httpAdmissionRequest{
+		Addr: addr,
+	}
+	v, err := json.Marshal(&rb)
+	if err != nil {
+		return
+	}
+
+	req, err := http.NewRequest(http.MethodPost, p.url, bytes.NewReader(v))
+	if err != nil {
+		return
+	}
+
+	if p.header != nil {
+		req.Header = p.header.Clone()
+	}
+	req.Header.Set("Content-Type", "application/json")
+	resp, err := p.client.Do(req)
+	if err != nil {
+		return
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		return
+	}
+
+	res := httpAdmissionResponse{}
+	if err := json.NewDecoder(resp.Body).Decode(&res); err != nil {
+		return
+	}
+	return res.OK
+}