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package jws
import (
"fmt"
"sync"
"github.com/lestrrat-go/jwx/v2/jwa"
)
type VerifierFactory interface {
Create() (Verifier, error)
}
type VerifierFactoryFn func() (Verifier, error)
func (fn VerifierFactoryFn) Create() (Verifier, error) {
return fn()
}
var muVerifierDB sync.RWMutex
var verifierDB map[jwa.SignatureAlgorithm]VerifierFactory
// RegisterVerifier is used to register a factory object that creates
// Verifier objects based on the given algorithm.
//
// For example, if you would like to provide a custom verifier for
// jwa.EdDSA, use this function to register a `VerifierFactory`
// (probably in your `init()`)
//
// Unlike the `UnregisterVerifier` function, this function automatically
// calls `jwa.RegisterSignatureAlgorithm` to register the algorithm
// in this module's algorithm database.
func RegisterVerifier(alg jwa.SignatureAlgorithm, f VerifierFactory) {
jwa.RegisterSignatureAlgorithm(alg)
muVerifierDB.Lock()
verifierDB[alg] = f
muVerifierDB.Unlock()
}
// UnregisterVerifier removes the signer factory associated with
// the given algorithm.
//
// Note that when you call this function, the algorithm itself is
// not automatically unregistered from this module's algorithm database.
// This is because the algorithm may still be required for signing or
// some other operation (however unlikely, it is still possible).
// Therefore, in order to completely remove the algorithm, you must
// call `jwa.UnregisterSignatureAlgorithm` yourself.
func UnregisterVerifier(alg jwa.SignatureAlgorithm) {
muVerifierDB.Lock()
delete(verifierDB, alg)
muVerifierDB.Unlock()
}
func init() {
verifierDB = make(map[jwa.SignatureAlgorithm]VerifierFactory)
for _, alg := range []jwa.SignatureAlgorithm{jwa.RS256, jwa.RS384, jwa.RS512, jwa.PS256, jwa.PS384, jwa.PS512} {
RegisterVerifier(alg, func(alg jwa.SignatureAlgorithm) VerifierFactory {
return VerifierFactoryFn(func() (Verifier, error) {
return newRSAVerifier(alg), nil
})
}(alg))
}
for _, alg := range []jwa.SignatureAlgorithm{jwa.ES256, jwa.ES384, jwa.ES512, jwa.ES256K} {
RegisterVerifier(alg, func(alg jwa.SignatureAlgorithm) VerifierFactory {
return VerifierFactoryFn(func() (Verifier, error) {
return newECDSAVerifier(alg), nil
})
}(alg))
}
for _, alg := range []jwa.SignatureAlgorithm{jwa.HS256, jwa.HS384, jwa.HS512} {
RegisterVerifier(alg, func(alg jwa.SignatureAlgorithm) VerifierFactory {
return VerifierFactoryFn(func() (Verifier, error) {
return newHMACVerifier(alg), nil
})
}(alg))
}
RegisterVerifier(jwa.EdDSA, VerifierFactoryFn(func() (Verifier, error) {
return newEdDSAVerifier(), nil
}))
}
// NewVerifier creates a verifier that signs payloads using the given signature algorithm.
func NewVerifier(alg jwa.SignatureAlgorithm) (Verifier, error) {
muVerifierDB.RLock()
f, ok := verifierDB[alg]
muVerifierDB.RUnlock()
if ok {
return f.Create()
}
return nil, fmt.Errorf(`unsupported signature algorithm "%s"`, alg)
}
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