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package sendit
import (
"crypto/rand"
"encoding/hex"
"time"
"github.com/golang-jwt/jwt/v5"
)
// Token values
const (
TokenIssuer = "sendit"
TokenAudienceAuth = "auth"
TokenAudienceConnect = "connect"
)
// GenerateToken will create a new token string with the given audience and subject,
// signed with the provided secret.
func GenerateToken(secret []byte, aud, sub string) (string, error) {
tok := jwt.NewWithClaims(jwt.SigningMethodHS256, &jwt.RegisteredClaims{
Issuer: TokenIssuer,
Audience: []string{aud},
Subject: sub,
IssuedAt: jwt.NewNumericDate(time.Now()),
NotBefore: jwt.NewNumericDate(time.Now().Add(-15 * time.Minute)),
})
return tok.SignedString(secret)
}
// TokenSubject will return the subject of a token, after verifying the signature
// and audience.
func TokenSubject(secret []byte, aud, token string) (string, error) {
tok, err := jwt.ParseWithClaims(token, &jwt.RegisteredClaims{}, func(tok *jwt.Token) (interface{}, error) {
if tok.Method.Alg() != jwt.SigningMethodHS256.Name {
return nil, jwt.ErrInvalidKeyType
}
return secret, nil
}, jwt.WithAudience(aud), jwt.WithIssuer(TokenIssuer), jwt.WithValidMethods([]string{"HS256"}))
if err != nil {
return "", err
}
return tok.Claims.(*jwt.RegisteredClaims).Subject, nil
}
func genID() (string, error) {
b := make([]byte, 32)
_, err := rand.Read(b)
if err != nil {
return "", err
}
return hex.EncodeToString(b), nil
}
// ValidPath will return true if `p` is a valid prefix path.
func ValidPath(p string) bool {
if len(p) < 3 {
return false
}
if len(p) > 64 {
return false
}
for _, r := range p {
if r == '-' {
continue
}
if r >= '0' && r <= '9' {
continue
}
if r >= 'a' && r <= 'z' {
continue
}
return false
}
return true
}
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