vendor/github.com/dgrijalva/jwt-go/signing_method.go


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package jwt

import (
    "sync"
)

var signingMethods = map[string]func() SigningMethod{}
var signingMethodLock = new(sync.RWMutex)

// Implement SigningMethod to add new methods for signing or verifying tokens.
type SigningMethod interface {
    Verify(signingString, signature string, key interface{}) error // Returns nil if signature is valid
    Sign(signingString string, key interface{}) (string, error)    // Returns encoded signature or error
    Alg() string                                                   // returns the alg identifier for this method (example: 'HS256')
}

// Register the "alg" name and a factory function for signing method.
// This is typically done during init() in the method's implementation
func RegisterSigningMethod(alg string, f func() SigningMethod) {
    signingMethodLock.Lock()
    defer signingMethodLock.Unlock()

    signingMethods[alg] = f
}

// Get a signing method from an "alg" string
func GetSigningMethod(alg string) (method SigningMethod) {
    signingMethodLock.RLock()
    defer signingMethodLock.RUnlock()

    if methodF, ok := signingMethods[alg]; ok {
        method = methodF()
    }
    return
}