80 lines
2.7 KiB
C#
80 lines
2.7 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Text;
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using System.Text.Json;
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using System.Text.Json.Serialization;
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namespace Pal.Client.Net;
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internal sealed class JwtClaims
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{
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[JsonPropertyName("nameid")]
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public Guid NameId { get; set; }
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[JsonPropertyName("role")]
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[JsonConverter(typeof(JwtRoleConverter))]
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public List<string> Roles { get; set; } = new();
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[JsonPropertyName("nbf")]
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[JsonConverter(typeof(JwtDateConverter))]
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public DateTimeOffset NotBefore { get; set; }
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[JsonPropertyName("exp")]
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[JsonConverter(typeof(JwtDateConverter))]
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public DateTimeOffset ExpiresAt { get; set; }
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public static JwtClaims FromAuthToken(string authToken)
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{
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if (string.IsNullOrEmpty(authToken))
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throw new ArgumentException("Server sent no auth token", nameof(authToken));
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string[] parts = authToken.Split('.');
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if (parts.Length != 3)
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throw new ArgumentException("Unsupported token type", nameof(authToken));
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// fix padding manually
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string payload = parts[1].Replace(",", "=").Replace("-", "+").Replace("/", "_");
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if (payload.Length % 4 == 2)
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payload += "==";
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else if (payload.Length % 4 == 3)
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payload += "=";
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string content = Encoding.UTF8.GetString(Convert.FromBase64String(payload));
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return JsonSerializer.Deserialize<JwtClaims>(content) ??
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throw new InvalidOperationException("token deserialization returned null");
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}
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}
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internal sealed class JwtRoleConverter : JsonConverter<List<string>>
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{
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public override List<string> Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
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{
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if (reader.TokenType == JsonTokenType.String)
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return new List<string> { reader.GetString() ?? throw new JsonException("no value present") };
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else if (reader.TokenType == JsonTokenType.StartArray)
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{
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List<string> result = new();
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while (reader.Read())
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{
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if (reader.TokenType == JsonTokenType.EndArray)
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{
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result.Sort();
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return result;
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}
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if (reader.TokenType != JsonTokenType.String)
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throw new JsonException("string expected");
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result.Add(reader.GetString() ?? throw new JsonException("no value present"));
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}
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throw new JsonException("read to end of document");
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}
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else
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throw new JsonException("bad token type");
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}
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public override void Write(Utf8JsonWriter writer, List<string> value, JsonSerializerOptions options) =>
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throw new NotImplementedException();
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}
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