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permission.go
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permission.go
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package grpc_permission
import (
"context"
middleware "github.com/grpc-ecosystem/go-grpc-middleware/v2"
"google.golang.org/grpc"
)
// Permission*Func is the pluggable function that performs authentication.
//
// The passed in `Context` will contain the gRPC metadata.MD object (for header-based authentication) and
// the peer.Peer information that can contain transport-based credentials (e.g. `credentials.PermissionInfo`).
//
// The returned context will be propagated to handlers, allowing user changes to `Context`. However,
// please make sure that the `Context` returned is a child `Context` of the one passed in.
//
// If error is returned, its `grpc.Code()` will be returned to the user as well as the verbatim message.
// Please make sure you use `codes.Unauthenticated` (lacking auth) and `codes.PermissionDenied`
// (authed, but lacking perms) appropriately.
type PermissionUnaryFunc func(ctx context.Context, info *grpc.UnaryServerInfo) (context.Context, error)
type PermissionStreamFunc func(ctx context.Context, srv interface{}, info *grpc.StreamServerInfo) (context.Context, error)
// ServiceUnaryPermissionFuncOverride
type ServiceUnaryPermissionFuncOverride interface {
PermissionUnaryFuncOverride(ctx context.Context, info *grpc.UnaryServerInfo) (context.Context, error)
}
// ServiceStreamPermissionFuncOverride
type ServiceStreamPermissionFuncOverride interface {
PermissionStreamFuncOverride(ctx context.Context, srv interface{}, info *grpc.StreamServerInfo) (context.Context, error)
}
// GetPermsRemap
type GetPermsRemapFunc interface {
GetPermsRemap() map[string]string
}
// UnaryServerInterceptor returns a new unary server interceptors that performs per-request permission checks.
func UnaryServerInterceptor(permissionFunc PermissionUnaryFunc) grpc.UnaryServerInterceptor {
return func(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (interface{}, error) {
var newCtx context.Context
var err error
if overrideSrv, ok := info.Server.(ServiceUnaryPermissionFuncOverride); ok {
newCtx, err = overrideSrv.PermissionUnaryFuncOverride(ctx, info)
} else {
newCtx, err = permissionFunc(ctx, info)
}
if err != nil {
return nil, err
}
return handler(newCtx, req)
}
}
// StreamServerInterceptor returns a new unary server interceptors that performs per-request permission checks.
func StreamServerInterceptor(permissionFunc PermissionStreamFunc) grpc.StreamServerInterceptor {
return func(srv interface{}, stream grpc.ServerStream, info *grpc.StreamServerInfo, handler grpc.StreamHandler) error {
var newCtx context.Context
var err error
if overrideSrv, ok := srv.(ServiceStreamPermissionFuncOverride); ok {
newCtx, err = overrideSrv.PermissionStreamFuncOverride(stream.Context(), srv, info)
} else {
newCtx, err = permissionFunc(stream.Context(), srv, info)
}
if err != nil {
return err
}
wrapped := middleware.WrapServerStream(stream)
wrapped.WrappedContext = newCtx
return handler(srv, wrapped)
}
}