47 lines
1.1 KiB
Go
47 lines
1.1 KiB
Go
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package token
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import (
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"encoding/base64"
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"encoding/json"
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"fmt"
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"strings"
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"time"
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)
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// DecodePayload decodes the payload (claims) of a JWT without verifying the signature.
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func DecodePayload(tokenStr string) (map[string]interface{}, error) {
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parts := strings.Split(tokenStr, ".")
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if len(parts) != 3 {
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return nil, fmt.Errorf("invalid JWT: expected 3 parts, got %d", len(parts))
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}
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payload, err := base64.RawURLEncoding.DecodeString(parts[1])
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if err != nil {
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return nil, fmt.Errorf("decoding JWT payload: %w", err)
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}
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var claims map[string]interface{}
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if err := json.Unmarshal(payload, &claims); err != nil {
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return nil, fmt.Errorf("unmarshaling JWT payload: %w", err)
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}
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return claims, nil
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}
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// ExpiryInfo extracts the expiry time and remaining duration from JWT claims.
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func ExpiryInfo(claims map[string]interface{}) (exp time.Time, remaining time.Duration) {
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expVal, ok := claims["exp"]
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if !ok {
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return time.Time{}, 0
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}
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expFloat, ok := expVal.(float64)
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if !ok {
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return time.Time{}, 0
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}
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exp = time.Unix(int64(expFloat), 0)
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remaining = time.Until(exp)
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return exp, remaining
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}
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