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69 lines
2.7 KiB
Go
69 lines
2.7 KiB
Go
// Copyright 2016 Michal Witkowski. All Rights Reserved.
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// See LICENSE for licensing terms.
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package grpc_auth
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import (
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"context"
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"github.com/grpc-ecosystem/go-grpc-middleware"
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"google.golang.org/grpc"
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)
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// AuthFunc is the pluggable function that performs authentication.
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//
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// The passed in `Context` will contain the gRPC metadata.MD object (for header-based authentication) and
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// the peer.Peer information that can contain transport-based credentials (e.g. `credentials.AuthInfo`).
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//
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// The returned context will be propagated to handlers, allowing user changes to `Context`. However,
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// please make sure that the `Context` returned is a child `Context` of the one passed in.
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//
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// If error is returned, its `grpc.Code()` will be returned to the user as well as the verbatim message.
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// Please make sure you use `codes.Unauthenticated` (lacking auth) and `codes.PermissionDenied`
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// (authed, but lacking perms) appropriately.
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type AuthFunc func(ctx context.Context) (context.Context, error)
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// ServiceAuthFuncOverride allows a given gRPC service implementation to override the global `AuthFunc`.
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//
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// If a service implements the AuthFuncOverride method, it takes precedence over the `AuthFunc` method,
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// and will be called instead of AuthFunc for all method invocations within that service.
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type ServiceAuthFuncOverride interface {
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AuthFuncOverride(ctx context.Context, fullMethodName string) (context.Context, error)
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}
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// UnaryServerInterceptor returns a new unary server interceptors that performs per-request auth.
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func UnaryServerInterceptor(authFunc AuthFunc) grpc.UnaryServerInterceptor {
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return func(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (interface{}, error) {
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var newCtx context.Context
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var err error
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if overrideSrv, ok := info.Server.(ServiceAuthFuncOverride); ok {
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newCtx, err = overrideSrv.AuthFuncOverride(ctx, info.FullMethod)
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} else {
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newCtx, err = authFunc(ctx)
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}
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if err != nil {
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return nil, err
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}
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return handler(newCtx, req)
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}
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}
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// StreamServerInterceptor returns a new unary server interceptors that performs per-request auth.
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func StreamServerInterceptor(authFunc AuthFunc) grpc.StreamServerInterceptor {
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return func(srv interface{}, stream grpc.ServerStream, info *grpc.StreamServerInfo, handler grpc.StreamHandler) error {
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var newCtx context.Context
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var err error
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if overrideSrv, ok := srv.(ServiceAuthFuncOverride); ok {
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newCtx, err = overrideSrv.AuthFuncOverride(stream.Context(), info.FullMethod)
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} else {
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newCtx, err = authFunc(stream.Context())
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}
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if err != nil {
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return err
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}
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wrapped := grpc_middleware.WrapServerStream(stream)
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wrapped.WrappedContext = newCtx
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return handler(srv, wrapped)
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}
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}
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