add metadata interceptors, auth client interceptors

Signed-off-by: Adphi <philippe.adrien.nousse@gmail.com>

interceptors/auth/basic.go

@@ -8,13 +8,15 @@ import (
 	grpc_auth "github.com/grpc-ecosystem/go-grpc-middleware/auth"
 
 	"go.linka.cloud/grpc/errors"
+	"go.linka.cloud/grpc/interceptors"
+	"go.linka.cloud/grpc/interceptors/metadata"
 )
 
 func BasicAuth(user, password string) string {
 	return "basic " + base64.StdEncoding.EncodeToString([]byte(user+":"+password))
 }
 
-type BasicValidator func(ctx context.Context, user, password string) (context.Context,error)
+type BasicValidator func(ctx context.Context, user, password string) (context.Context, error)
 
 func makeBasicAuthFunc(v BasicValidator) grpc_auth.AuthFunc {
 	return func(ctx context.Context) (context.Context, error) {
@@ -34,3 +36,7 @@ func makeBasicAuthFunc(v BasicValidator) grpc_auth.AuthFunc {
 		return v(ctx, cs[:s], cs[s+1:])
 	}
 }
+
+func NewBasicAuthClientIntereptors(user, password string) interceptors.ClientInterceptors {
+	return metadata.NewInterceptors("authorization", BasicAuth(user, password))
+}

interceptors/auth/interceptors.go

@@ -2,6 +2,7 @@ package auth
 
 import (
 	"context"
+	"crypto/subtle"
 	"strings"
 
 	grpc_auth "github.com/grpc-ecosystem/go-grpc-middleware/auth"
@@ -40,8 +41,8 @@ func NewServerInterceptors(opts ...Option) interceptors.ServerInterceptors {
 	return &interceptor{o: o, authFn: ChainedAuthFuncs(o.authFns...)}
 }
 
-type interceptor struct{
-	o options
+type interceptor struct {
+	o      options
 	authFn grpc_auth.AuthFunc
 }
 
@@ -92,3 +93,7 @@ func (i *interceptor) isNotProtected(endpoint string) bool {
 	}
 	return true
 }
+
+func Equals(s1, s2 string) bool {
+	return subtle.ConstantTimeCompare([]byte(s1), []byte(s2)) == 1
+}

interceptors/auth/interceptors_test.go

@@ -102,11 +102,11 @@ func TestChainedAuthFuncs(t *testing.T) {
 			code: codes.PermissionDenied,
 		},
 		{
-			name: "internal error",
-			auth: "bearer internal",
+			name:          "internal error",
+			auth:          "bearer internal",
 			internalError: true,
-			err: true,
-			code: codes.PermissionDenied,
+			err:           true,
+			code:          codes.PermissionDenied,
 		},
 		{
 			name: "multiple auth: first basic valid",

interceptors/auth/token.go

@@ -4,6 +4,9 @@ import (
 	"context"
 
 	grpc_auth "github.com/grpc-ecosystem/go-grpc-middleware/auth"
+
+	"go.linka.cloud/grpc/interceptors"
+	"go.linka.cloud/grpc/interceptors/metadata"
 )
 
 type TokenValidator func(ctx context.Context, token string) (context.Context, error)
@@ -17,3 +20,7 @@ func makeTokenAuthFunc(v TokenValidator) grpc_auth.AuthFunc {
 		return v(ctx, a)
 	}
 }
+
+func NewBearerClientInterceptors(token string) interceptors.ClientInterceptors {
+	return metadata.NewInterceptors("authorization", "Bearer "+token)
+}

interceptors/metadata/metadata.go

@@ -0,0 +1,54 @@
+package metadata
+
+import (
+	"context"
+
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/metadata"
+
+	"go.linka.cloud/grpc/interceptors"
+)
+
+func NewInterceptors(pairs ...string) interceptors.Interceptors {
+	return mdInterceptors{pairs: pairs}
+}
+
+type mdInterceptors struct {
+	pairs []string
+}
+
+func (i mdInterceptors) UnaryServerInterceptor() grpc.UnaryServerInterceptor {
+	return func(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (resp interface{}, err error) {
+		if err := grpc.SetHeader(ctx, metadata.Pairs(i.pairs...)); err != nil {
+			return nil, err
+		}
+		return handler(ctx, req)
+	}
+}
+
+func (i mdInterceptors) StreamServerInterceptor() grpc.StreamServerInterceptor {
+	return func(srv interface{}, ss grpc.ServerStream, info *grpc.StreamServerInfo, handler grpc.StreamHandler) error {
+		if err := grpc.SetHeader(ss.Context(), metadata.Pairs(i.pairs...)); err != nil {
+			return err
+		}
+		return handler(srv, ss)
+	}
+}
+
+func (i mdInterceptors) UnaryClientInterceptor() grpc.UnaryClientInterceptor {
+	return func(ctx context.Context, method string, req, reply interface{}, cc *grpc.ClientConn, invoker grpc.UnaryInvoker, opts ...grpc.CallOption) error {
+		if err := grpc.SetHeader(ctx, metadata.Pairs(i.pairs...)); err != nil {
+			return err
+		}
+		return invoker(ctx, method, req, reply, cc, opts...)
+	}
+}
+
+func (i mdInterceptors) StreamClientInterceptor() grpc.StreamClientInterceptor {
+	return func(ctx context.Context, desc *grpc.StreamDesc, cc *grpc.ClientConn, method string, streamer grpc.Streamer, opts ...grpc.CallOption) (grpc.ClientStream, error) {
+		if err := grpc.SetHeader(ctx, metadata.Pairs(i.pairs...)); err != nil {
+			return nil, err
+		}
+		return streamer(ctx, desc, cc, method, opts...)
+	}
+}

interceptors/recovery/interceptors.go

@@ -30,6 +30,3 @@ func (i *recovery) UnaryClientInterceptor() grpc.UnaryClientInterceptor {
 func (i *recovery) StreamClientInterceptor() grpc.StreamClientInterceptor {
 	panic("not implemented")
 }
-
-
-

interceptors/sentry/interceptors.go

@@ -3,7 +3,7 @@ package sentry
 import (
 	"google.golang.org/grpc"
 
-	"github.com/johnbellone/grpc-middleware-sentry"
+	grpc_sentry "github.com/johnbellone/grpc-middleware-sentry"
 
 	"go.linka.cloud/grpc/interceptors"
 )
@@ -31,6 +31,3 @@ func (i *interceptor) UnaryClientInterceptor() grpc.UnaryClientInterceptor {
 func (i *interceptor) StreamClientInterceptor() grpc.StreamClientInterceptor {
 	return grpc_sentry.StreamClientInterceptor(i.opts...)
 }
-
-
-