107 lines
3.6 KiB
C#
107 lines
3.6 KiB
C#
using Prospect.Server.Api.Services.CloudScript.Models;
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using System.Security.Cryptography;
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using System.Text.Json;
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namespace Prospect.Server.Api.Services.CloudScript.Functions;
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public class TokenGenerator
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{
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public static int TokenSequenceId = 0;
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// Header is static - base64url encoded {}
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private static readonly string Header = "e30";
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public static string vxGenerateToken(string key, string issuer, int exp, string vxa, string f, string t)
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{
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TokenSequenceId++;
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var claims = new Claims
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{
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iss = issuer,
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exp = exp,
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vxa = vxa,
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vxi = TokenSequenceId,
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f = f,
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t = t
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};
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List<string> segments = new List<string>();
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segments.Add(Header);
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// Encode payload
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var claimsString = JsonSerializer.Serialize(claims);
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var encodedClaims = Base64URLEncode(claimsString);
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// Join segments to prepare for signing
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segments.Add(encodedClaims);
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string toSign = String.Join(".", segments);
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// Sign token with key and SHA256
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string sig = SHA256Hash(key, toSign);
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segments.Add(sig);
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// Join all 3 parts of token with . and return
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string token = String.Join(".", segments);
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return token;
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}
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private static string Base64URLEncode(string plainText)
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{
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var plainTextBytes = System.Text.Encoding.UTF8.GetBytes(plainText);
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// Remove padding at the end
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var encodedString = Convert.ToBase64String(plainTextBytes).TrimEnd('=');
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// Substitute URL-safe characters
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string urlEncoded = encodedString.Replace("+", "-").Replace("/", "_");
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return urlEncoded;
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}
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private static string SHA256Hash(string secret, string message)
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{
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var encoding = new System.Text.ASCIIEncoding();
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byte[] keyByte = encoding.GetBytes(secret);
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byte[] messageBytes = encoding.GetBytes(message);
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// The instance of HMACSHA256 is constructed and disposed in this method because it is not thread safe
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using var hmacsha256 = new HMACSHA256(keyByte);
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byte[] hashmessage = hmacsha256.ComputeHash(messageBytes);
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var hashString = Convert.ToBase64String(hashmessage).TrimEnd('=');
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string urlEncoded = hashString.Replace("+", "-").Replace("/", "_");
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return urlEncoded;
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}
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public class Claims
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{
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public string iss { get; set; }
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public int exp { get; set; }
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public string vxa { get; set; }
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public int vxi { get; set; }
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public string f { get; set; }
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public string t { get; set; }
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public string sub { get; set; }
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}
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}
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[CloudScriptFunction("VivoxLogin")]
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public class VivoxLogin : ICloudScriptFunction<FYVivoxLoginTokenRequest, FYVivoxJoinData>
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{
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public async Task<FYVivoxJoinData> ExecuteAsync(FYVivoxLoginTokenRequest request)
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{
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// TODO: Replace with app configuration
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var channel = "sip:confctl-g-<issuer>.testchannel@mtu1xp.vivox.com"; // e - echo channel, g - global, p - positional
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var exp = (int)DateTimeOffset.UtcNow.AddSeconds(90).ToUnixTimeSeconds();
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var token = TokenGenerator.vxGenerateToken("key", "issuer", exp, "login", request.Username, channel);
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return new FYVivoxJoinData
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{
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Request = new Models.Data.FYVivoxJoinTokenRequest{
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Username = request.Username,
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Channel = channel,
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HasAudio = false,
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HasText = true,
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ChannelType = 2,
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ChannelID = "testchannel",
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},
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Token = token
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};
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}
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} |