58 lines
1.4 KiB
C#
58 lines
1.4 KiB
C#
using System.Security.Claims;
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using System.Text.Json;
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namespace TechHelper.Features
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{
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public static class JWTParser
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{
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public static IEnumerable<Claim> ParseClaimsFromJwt(string jwt)
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{
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var claims = new List<Claim>();
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var payload = jwt.Split(".")[1];
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var jsonBytes = ParseBase64WithoutPadding(payload);
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var keyValuePairs = JsonSerializer
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.Deserialize<Dictionary<string, object>>(jsonBytes);
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ExtractRolesFromJWT(claims, keyValuePairs);
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claims.AddRange(keyValuePairs
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.Select(kvp => new Claim(kvp.Key, kvp.Value.ToString())));
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return claims;
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}
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private static byte[] ParseBase64WithoutPadding(string base64)
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{
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switch (base64.Length % 4)
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{
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case 2: base64 += "=="; break;
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case 3: base64 += "="; break;
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}
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return Convert.FromBase64String(base64);
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}
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private static void ExtractRolesFromJWT(List<Claim> claims, Dictionary<string, object> keyValuePairs)
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{
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keyValuePairs.TryGetValue(ClaimTypes.Role, out object roles);
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if (roles != null)
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{
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var parsedRoles = roles.ToString().Trim().TrimStart('[').TrimEnd(']').Split(',');
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if (parsedRoles.Length > 1)
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{
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foreach (var parsedRole in parsedRoles)
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{
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claims.Add(new Claim(ClaimTypes.Role, parsedRole.Trim('"')));
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}
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}
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else
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{
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claims.Add(new Claim(ClaimTypes.Role, parsedRoles[0]));
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}
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keyValuePairs.Remove(ClaimTypes.Role);
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}
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}
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}
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}
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