[英]Parse JWT Token to get the payload content only without external library in C# or Blazor
我正在使用可以訪問 JWT 的 Blazor 編寫客戶端應用程序。 我想知道一種無需添加額外依賴項即可讀取令牌有效負載內容的簡單方法,因為我不需要其他信息並且不需要驗證令牌。 我認為解析有效負載內容應該足夠簡單,只需將其寫入方法即可。
JwtTokenContent ReadJwtTokenContent(string token)
{
var content = token.Split('.')[1];
// Exception here, it's not a valid base64 string
var jsonPayload = Encoding.UTF8.GetString(
Convert.FromBase64String(content));
Console.WriteLine(jsonPayload);
return JsonSerializer.Deserialize<JwtTokenContent>(jsonPayload);
}
如何解碼有效載荷? 它似乎不僅僅是一個 base64 字符串。
輸入不是有效的 Base-64 字符串,因為它包含非 Base-64 字符、兩個以上的填充字符或填充字符中的非法字符。
這是一個示例 JWT 令牌:
eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJJZCI6IjUyYjg3ZTUwLTViYmMtNDE0Ny1iOTMwLWY2ZGI0ZTUyNDEwYiIsIlVzZXJuYW1lIjoiZGF0dm1Ab3V0bG9vay5jb20iLCJpc3MiOiJodHRwczovL2xvY2FsaG9zdDo0NDMyMi8ifQ.4wKxDCwQ6onvNA_atndSitGjufR-tXutWq-tRNhqKzc
(內容是eyJJZCI6IjUyYjg3ZTUwLTViYmMtNDE0Ny1iOTMwLWY2ZGI0ZTUyNDEwYiIsIlVzZXJuYW1lIjoiZGF0dm1Ab3V0bG9vay5jb20iLCJpc3MiOiJodHRwczovL2xvY2FsaG9zdDo0NDMyMi8ifQ
感謝 Kalten,這是我的案例的解決方案:
JwtTokenContent ReadJwtTokenContent(string token)
{
var content = token.Split('.')[1];
Console.WriteLine(content);
var jsonPayload = Encoding.UTF8.GetString(
this.Decode(content));
Console.WriteLine(jsonPayload);
return JsonSerializer.Deserialize<JwtTokenContent>(jsonPayload);
}
byte[] Decode(string input)
{
var output = input;
output = output.Replace('-', '+'); // 62nd char of encoding
output = output.Replace('_', '/'); // 63rd char of encoding
switch (output.Length % 4) // Pad with trailing '='s
{
case 0: break; // No pad chars in this case
case 2: output += "=="; break; // Two pad chars
case 3: output += "="; break; // One pad char
default: throw new System.ArgumentOutOfRangeException("input", "Illegal base64url string!");
}
var converted = Convert.FromBase64String(output); // Standard base64 decoder
return converted;
}
史蒂夫安德森試試這個
public static IEnumerable<Claim> ParseClaimsFromJwt(string jwt)
{
var payload = jwt.Split('.')[1];
var jsonBytes = ParseBase64WithoutPadding(payload);
var keyValuePairs = JsonSerializer.Deserialize<Dictionary<string, object>>(jsonBytes);
return keyValuePairs.Select(kvp => new Claim(kvp.Key, kvp.Value.ToString()));
}
private static byte[] ParseBase64WithoutPadding(string base64)
{
switch (base64.Length % 4)
{
case 2: base64 += "=="; break;
case 3: base64 += "="; break;
}
return Convert.FromBase64String(base64);
}
var token = await GetTokenAsync();
var identity = string.IsNullOrEmpty(token)
? new ClaimsIdentity()
: new ClaimsIdentity(ServiceExtensions.ParseClaimsFromJwt(token), "jwt");
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