69 lines
2 KiB
Go
69 lines
2 KiB
Go
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package jws
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import (
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"github.com/lestrrat-go/jwx/jwa"
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"github.com/pkg/errors"
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)
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type VerifierFactory interface {
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Create() (Verifier, error)
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}
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type VerifierFactoryFn func() (Verifier, error)
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func (fn VerifierFactoryFn) Create() (Verifier, error) {
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return fn()
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}
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var verifierDB map[jwa.SignatureAlgorithm]VerifierFactory
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// RegisterVerifier is used to register a factory object that creates
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// Verifier objects based on the given algorithm.
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//
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// For example, if you would like to provide a custom verifier for
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// jwa.EdDSA, use this function to register a `VerifierFactory`
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// (probably in your `init()`)
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func RegisterVerifier(alg jwa.SignatureAlgorithm, f VerifierFactory) {
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verifierDB[alg] = f
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}
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func init() {
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verifierDB = make(map[jwa.SignatureAlgorithm]VerifierFactory)
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for _, alg := range []jwa.SignatureAlgorithm{jwa.RS256, jwa.RS384, jwa.RS512, jwa.PS256, jwa.PS384, jwa.PS512} {
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RegisterVerifier(alg, func(alg jwa.SignatureAlgorithm) VerifierFactory {
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return VerifierFactoryFn(func() (Verifier, error) {
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return newRSAVerifier(alg), nil
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})
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}(alg))
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}
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for _, alg := range []jwa.SignatureAlgorithm{jwa.ES256, jwa.ES384, jwa.ES512, jwa.ES256K} {
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RegisterVerifier(alg, func(alg jwa.SignatureAlgorithm) VerifierFactory {
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return VerifierFactoryFn(func() (Verifier, error) {
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return newECDSAVerifier(alg), nil
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})
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}(alg))
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}
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for _, alg := range []jwa.SignatureAlgorithm{jwa.HS256, jwa.HS384, jwa.HS512} {
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RegisterVerifier(alg, func(alg jwa.SignatureAlgorithm) VerifierFactory {
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return VerifierFactoryFn(func() (Verifier, error) {
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return newHMACVerifier(alg), nil
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})
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}(alg))
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}
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RegisterVerifier(jwa.EdDSA, VerifierFactoryFn(func() (Verifier, error) {
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return newEdDSAVerifier(), nil
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}))
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}
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// NewVerifier creates a verifier that signs payloads using the given signature algorithm.
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func NewVerifier(alg jwa.SignatureAlgorithm) (Verifier, error) {
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f, ok := verifierDB[alg]
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if ok {
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return f.Create()
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}
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return nil, errors.Errorf(`unsupported signature algorithm "%s"`, alg)
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}
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