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package jwt
import "time"
// ParserOption is used to implement functional-style options that modify the
// behavior of the parser. To add new options, just create a function (ideally
// beginning with With or Without) that returns an anonymous function that takes
// a *Parser type as input and manipulates its configuration accordingly.
type ParserOption func(*Parser)
// WithValidMethods is an option to supply algorithm methods that the parser
// will check. Only those methods will be considered valid. It is heavily
// encouraged to use this option in order to prevent attacks such as
// https://auth0.com/blog/critical-vulnerabilities-in-json-web-token-libraries/.
func WithValidMethods(methods []string) ParserOption {
return func(p *Parser) {
p.validMethods = methods
}
}
// WithJSONNumber is an option to configure the underlying JSON parser with
// UseNumber.
func WithJSONNumber() ParserOption {
return func(p *Parser) {
p.useJSONNumber = true
}
}
// WithoutClaimsValidation is an option to disable claims validation. This
// option should only be used if you exactly know what you are doing.
func WithoutClaimsValidation() ParserOption {
return func(p *Parser) {
p.skipClaimsValidation = true
}
}
// WithLeeway returns the ParserOption for specifying the leeway window.
func WithLeeway(leeway time.Duration) ParserOption {
return func(p *Parser) {
p.validator.leeway = leeway
}
}
// WithTimeFunc returns the ParserOption for specifying the time func. The
// primary use-case for this is testing. If you are looking for a way to account
// for clock-skew, WithLeeway should be used instead.
func WithTimeFunc(f func() time.Time) ParserOption {
return func(p *Parser) {
p.validator.timeFunc = f
}
}
// WithIssuedAt returns the ParserOption to enable verification
// of issued-at.
func WithIssuedAt() ParserOption {
return func(p *Parser) {
p.validator.verifyIat = true
}
}
// WithExpirationRequired returns the ParserOption to make exp claim required.
// By default exp claim is optional.
func WithExpirationRequired() ParserOption {
return func(p *Parser) {
p.validator.requireExp = true
}
}
// WithAudience configures the validator to require the specified audience in
// the `aud` claim. Validation will fail if the audience is not listed in the
// token or the `aud` claim is missing.
//
// NOTE: While the `aud` claim is OPTIONAL in a JWT, the handling of it is
// application-specific. Since this validation API is helping developers in
// writing secure application, we decided to REQUIRE the existence of the claim,
// if an audience is expected.
func WithAudience(aud string) ParserOption {
return func(p *Parser) {
p.validator.expectedAud = aud
}
}
// WithIssuer configures the validator to require the specified issuer in the
// `iss` claim. Validation will fail if a different issuer is specified in the
// token or the `iss` claim is missing.
//
// NOTE: While the `iss` claim is OPTIONAL in a JWT, the handling of it is
// application-specific. Since this validation API is helping developers in
// writing secure application, we decided to REQUIRE the existence of the claim,
// if an issuer is expected.
func WithIssuer(iss string) ParserOption {
return func(p *Parser) {
p.validator.expectedIss = iss
}
}
// WithSubject configures the validator to require the specified subject in the
// `sub` claim. Validation will fail if a different subject is specified in the
// token or the `sub` claim is missing.
//
// NOTE: While the `sub` claim is OPTIONAL in a JWT, the handling of it is
// application-specific. Since this validation API is helping developers in
// writing secure application, we decided to REQUIRE the existence of the claim,
// if a subject is expected.
func WithSubject(sub string) ParserOption {
return func(p *Parser) {
p.validator.expectedSub = sub
}
}
// WithPaddingAllowed will enable the codec used for decoding JWTs to allow
// padding. Note that the JWS RFC7515 states that the tokens will utilize a
// Base64url encoding with no padding. Unfortunately, some implementations of
// JWT are producing non-standard tokens, and thus require support for decoding.
func WithPaddingAllowed() ParserOption {
return func(p *Parser) {
p.decodePaddingAllowed = true
}
}
// WithStrictDecoding will switch the codec used for decoding JWTs into strict
// mode. In this mode, the decoder requires that trailing padding bits are zero,
// as described in RFC 4648 section 3.5.
func WithStrictDecoding() ParserOption {
return func(p *Parser) {
p.decodeStrict = true
}
}
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