93 lines
2.2 KiB
Go
93 lines
2.2 KiB
Go
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package main
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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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"os"
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"strings"
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)
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func main() {
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if len(os.Args) < 2 {
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fmt.Println("Usage: decode-token <jwt-token>")
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os.Exit(1)
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}
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token := os.Args[1]
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parts := strings.Split(token, ".")
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if len(parts) != 3 {
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fmt.Println("Invalid JWT token format")
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os.Exit(1)
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}
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// Decode header
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fmt.Println("=== JWT HEADER ===")
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headerBytes, err := base64.RawStdEncoding.DecodeString(parts[0])
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if err != nil {
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fmt.Printf("Failed to decode header: %v\n", err)
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os.Exit(1)
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}
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var header map[string]interface{}
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if err := json.Unmarshal(headerBytes, &header); err != nil {
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fmt.Printf("Failed to parse header: %v\n", err)
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os.Exit(1)
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}
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headerJSON, _ := json.MarshalIndent(header, "", " ")
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fmt.Println(string(headerJSON))
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// Decode payload
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fmt.Println("\n=== JWT PAYLOAD (CLAIMS) ===")
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payloadBytes, err := base64.RawStdEncoding.DecodeString(parts[1])
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if err != nil {
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fmt.Printf("Failed to decode payload: %v\n", err)
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os.Exit(1)
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}
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var payload map[string]interface{}
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if err := json.Unmarshal(payloadBytes, &payload); err != nil {
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fmt.Printf("Failed to parse payload: %v\n", err)
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os.Exit(1)
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}
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payloadJSON, _ := json.MarshalIndent(payload, "", " ")
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fmt.Println(string(payloadJSON))
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fmt.Println("\n=== KEY FIELDS ===")
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if sub, ok := payload["sub"].(string); ok {
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fmt.Printf("User ID (sub): %s\n", sub)
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}
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if typ, ok := payload["typ"].(string); ok {
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fmt.Printf("Token Type (typ): %s\n", typ)
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}
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if aud, ok := payload["aud"].(string); ok {
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fmt.Printf("Audience (aud): %s\n", aud)
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}
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if exp, ok := payload["exp"].(float64); ok {
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fmt.Printf("Expires (exp): %v\n", exp)
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}
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if iat, ok := payload["iat"].(float64); ok {
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fmt.Printf("Issued At (iat): %v\n", iat)
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}
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// Check for user profile fields
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fmt.Println("\n=== USER PROFILE FIELDS ===")
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hasProfile := false
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for key, value := range payload {
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if strings.Contains(strings.ToLower(key), "name") ||
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strings.Contains(strings.ToLower(key), "user") ||
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strings.Contains(strings.ToLower(key), "display") ||
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strings.Contains(strings.ToLower(key), "email") {
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fmt.Printf("%s: %v\n", key, value)
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hasProfile = true
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}
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}
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if !hasProfile {
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fmt.Println("(No user profile fields found in token)")
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}
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}
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