mirror of
https://github.com/1f349/mjwt.git
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130 lines
3.4 KiB
Go
130 lines
3.4 KiB
Go
package mjwt
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import (
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"encoding/json"
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"github.com/golang-jwt/jwt/v4"
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"github.com/pkg/errors"
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"time"
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)
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var ErrClaimTypeMismatch = errors.New("claim type mismatch")
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// wrapClaims creates a BaseTypeClaims wrapper for a generic claims struct
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func wrapClaims[T Claims](p Signer, sub, id string, aud jwt.ClaimStrings, dur time.Duration, claims T) *BaseTypeClaims[T] {
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now := time.Now()
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return (&BaseTypeClaims[T]{
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RegisteredClaims: jwt.RegisteredClaims{
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Issuer: p.Issuer(),
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Subject: sub,
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Audience: aud,
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ExpiresAt: jwt.NewNumericDate(now.Add(dur)),
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NotBefore: jwt.NewNumericDate(now),
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IssuedAt: jwt.NewNumericDate(now),
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ID: id,
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},
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Claims: claims,
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}).init()
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}
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// ExtractClaims uses a Verifier to validate the MJWT token and returns the parsed
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// token and BaseTypeClaims
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func ExtractClaims[T Claims](p Verifier, token string) (*jwt.Token, BaseTypeClaims[T], error) {
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b := BaseTypeClaims[T]{
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RegisteredClaims: jwt.RegisteredClaims{},
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Claims: *new(T),
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}
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tok, err := p.VerifyJwt(token, &b)
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return tok, b, err
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}
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// Claims is a wrapper for jwt.Claims and adds a Type method to name internal claim structs
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type Claims interface {
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jwt.Claims
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Type() string
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}
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type baseTypeClaim interface {
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jwt.Claims
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InternalClaimType() string
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}
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// BaseTypeClaims is a wrapper for combining the jwt.RegisteredClaims with a ClaimType
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// and generic Claims data
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type BaseTypeClaims[T Claims] struct {
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jwt.RegisteredClaims
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ClaimType string
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Claims T
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}
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func (b *BaseTypeClaims[T]) init() *BaseTypeClaims[T] {
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b.ClaimType = b.InternalClaimType()
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return b
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}
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// Valid checks the InternalClaimType matches and the type claim type
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func (b *BaseTypeClaims[T]) Valid() error {
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if b.ClaimType != b.InternalClaimType() {
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return ErrClaimTypeMismatch
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}
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return b.Claims.Valid()
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}
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// InternalClaimType returns the Type of the generic claim struct
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func (b *BaseTypeClaims[T]) InternalClaimType() string { return b.Claims.Type() }
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// MarshalJSON converts the internalBaseTypeClaims and generic claim struct into
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// a serialized JSON byte array
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func (b *BaseTypeClaims[T]) MarshalJSON() ([]byte, error) {
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// encode the internalBaseTypeClaims
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b1, err := json.Marshal(internalBaseTypeClaims{
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RegisteredClaims: b.RegisteredClaims,
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ClaimType: b.InternalClaimType(),
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})
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if err != nil {
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return nil, err
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}
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// encode the generic claims struct
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b2, err := json.Marshal(b.Claims)
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if err != nil {
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return nil, err
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}
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// replace starting '{' with ','
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b2[0] = ','
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// join the two json strings and remove the last char '}' from the first string
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return append(b1[:len(b1)-1], b2...), nil
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}
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// UnmarshalJSON reads the internalBaseTypeClaims and generic claim struct from
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// a serialized JSON byte array
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func (b *BaseTypeClaims[T]) UnmarshalJSON(bytes []byte) error {
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a := internalBaseTypeClaims{}
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var t T
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// convert JSON to internalBaseTypeClaims
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err := json.Unmarshal(bytes, &a)
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if err != nil {
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return err
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}
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// convert JSON to the generic claim struct
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err = json.Unmarshal(bytes, &t)
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if err != nil {
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return err
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}
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// assign the fields in BaseTypeClaims
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b.RegisteredClaims = a.RegisteredClaims
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b.ClaimType = a.ClaimType
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b.Claims = t
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return err
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}
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// internalBaseTypeClaims is a wrapper for jwt.RegisteredClaims which adds a
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// ClaimType field containing the type of the generic claim struct
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type internalBaseTypeClaims struct {
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jwt.RegisteredClaims
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ClaimType string `json:"mct"`
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}
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