69 lines
1.9 KiB
Go
69 lines
1.9 KiB
Go
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 SignerFactory interface {
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Create() (Signer, error)
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}
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type SignerFactoryFn func() (Signer, error)
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func (fn SignerFactoryFn) Create() (Signer, error) {
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return fn()
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}
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var signerDB map[jwa.SignatureAlgorithm]SignerFactory
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// RegisterSigner is used to register a factory object that creates
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// Signer objects based on the given algorithm.
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//
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// For example, if you would like to provide a custom signer for
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// jwa.EdDSA, use this function to register a `SignerFactory`
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// (probably in your `init()`)
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func RegisterSigner(alg jwa.SignatureAlgorithm, f SignerFactory) {
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signerDB[alg] = f
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}
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func init() {
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signerDB = make(map[jwa.SignatureAlgorithm]SignerFactory)
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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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RegisterSigner(alg, func(alg jwa.SignatureAlgorithm) SignerFactory {
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return SignerFactoryFn(func() (Signer, error) {
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return newRSASigner(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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RegisterSigner(alg, func(alg jwa.SignatureAlgorithm) SignerFactory {
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return SignerFactoryFn(func() (Signer, error) {
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return newECDSASigner(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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RegisterSigner(alg, func(alg jwa.SignatureAlgorithm) SignerFactory {
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return SignerFactoryFn(func() (Signer, error) {
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return newHMACSigner(alg), nil
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})
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}(alg))
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}
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RegisterSigner(jwa.EdDSA, SignerFactoryFn(func() (Signer, error) {
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return newEdDSASigner(), nil
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}))
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}
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// NewSigner creates a signer that signs payloads using the given signature algorithm.
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func NewSigner(alg jwa.SignatureAlgorithm) (Signer, error) {
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f, ok := signerDB[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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