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// Copyright 2018 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package auth
import (
"gvisor.dev/gvisor/pkg/context"
)
// contextID is the auth package's type for context.Context.Value keys.
type contextID int
const (
// CtxCredentials is a Context.Value key for Credentials.
CtxCredentials contextID = iota
// CtxThreadGroupID is the current thread group ID when a context represents
// a task context. The value is represented as an int32.
CtxThreadGroupID contextID = iota
)
// CredentialsFromContext returns a copy of the Credentials used by ctx, or a
// set of Credentials with no capabilities if ctx does not have Credentials.
func CredentialsFromContext(ctx context.Context) *Credentials {
if v := ctx.Value(CtxCredentials); v != nil {
return v.(*Credentials)
}
return NewAnonymousCredentials()
}
// ThreadGroupIDFromContext returns the current thread group ID when ctx
// represents a task context.
func ThreadGroupIDFromContext(ctx context.Context) (tgid int32, ok bool) {
if tgid := ctx.Value(CtxThreadGroupID); tgid != nil {
return tgid.(int32), true
}
return 0, false
}
// ContextWithCredentials returns a copy of ctx carrying creds.
func ContextWithCredentials(ctx context.Context, creds *Credentials) context.Context {
return &authContext{ctx, creds}
}
type authContext struct {
context.Context
creds *Credentials
}
// Value implements context.Context.
func (ac *authContext) Value(key interface{}) interface{} {
switch key {
case CtxCredentials:
return ac.creds
default:
return ac.Context.Value(key)
}
}
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