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token.go
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token.go
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package cocaine12
import (
"sort"
"sync"
)
var (
tmMu sync.RWMutex
factories = make(map[string]TokenManagerFactory)
)
// Token carries information about an authorization token.
type Token struct {
ty string
body string
}
func NewToken(ty string, body string) Token {
return Token{ty, body}
}
// Type returns token's type.
// Depending on the context it can be empty, OAUTH, TVM etc.
func (t Token) Type() string {
return t.ty
}
// Body returns token's body.
// The real body meaning can be determined via token's type.
func (t Token) Body() string {
return t.body
}
type TokenManagerFactory interface {
Create(appName string, token Token) (TokenManager, error)
}
// TokenManager automates tokens housekeeping, like timely updation to
// be able to always provide the most fresh tokens.
type TokenManager interface {
Token() Token
Stop()
}
// NullTokenManager represents no-op token manager.
// It always returns an empty token.
type NullTokenManager struct{}
func (t *NullTokenManager) Token() Token {
return Token{}
}
func (t *NullTokenManager) Stop() {}
// TokenManagers returns a sorted list of the names of the registered token
// manager factories.
func TokenManagers() []string {
tmMu.RLock()
defer tmMu.RUnlock()
var list []string
for name := range factories {
list = append(list, name)
}
sort.Strings(list)
return list
}
// Register makes a token manager factory available by the provided name.
// If Register is called twice with the same name or if factory
// is nil, it panics.
func Register(name string, factory TokenManagerFactory) {
tmMu.Lock()
defer tmMu.Unlock()
if factory == nil {
panic("cocaine: TokenManagerFactory is nil")
}
if _, dup := factories[name]; dup {
panic("cocaine: Register called twice for token manager factory " + name)
}
factories[name] = factory
}
func NewTokenManager(appName string, token Token) (TokenManager, error) {
tmMu.Lock()
defer tmMu.Unlock()
if factory, ok := factories[token.ty]; ok {
return factory.Create(appName, token)
}
return new(NullTokenManager), nil
}