Push changes

src/Prospect.Server.Api/Services/CloudScript/Functions/VivoxLogin.cs

@@ -1,15 +1,107 @@
 using Prospect.Server.Api.Services.CloudScript.Models;
+using System.Security.Cryptography;
+using System.Text.Json;
 
 namespace Prospect.Server.Api.Services.CloudScript.Functions;
 
+public class TokenGenerator
+{
+    public static int TokenSequenceId = 0;
+    // Header is static - base64url encoded {}
+    private static readonly string Header = "e30";
+
+    public static string vxGenerateToken(string key, string issuer, int exp, string vxa, string f, string t)
+    {
+        TokenSequenceId++;
+        var claims = new Claims
+        {
+            iss = issuer,
+            exp = exp,
+            vxa = vxa,
+            vxi = TokenSequenceId,
+            f = f,
+            t = t
+        };
+
+        List<string> segments = new List<string>();
+        segments.Add(Header);
+
+        // Encode payload
+        var claimsString = JsonSerializer.Serialize(claims);
+        var encodedClaims = Base64URLEncode(claimsString);
+
+        // Join segments to prepare for signing
+        segments.Add(encodedClaims);
+        string toSign = String.Join(".", segments);
+
+        // Sign token with key and SHA256
+        string sig = SHA256Hash(key, toSign);
+        segments.Add(sig);
+
+        // Join all 3 parts of token with . and return
+        string token = String.Join(".", segments);
+
+        return token;
+    }
+
+    private static string Base64URLEncode(string plainText)
+    {
+        var plainTextBytes = System.Text.Encoding.UTF8.GetBytes(plainText);
+        // Remove padding at the end
+        var encodedString = Convert.ToBase64String(plainTextBytes).TrimEnd('=');
+        // Substitute URL-safe characters
+        string urlEncoded = encodedString.Replace("+", "-").Replace("/", "_");
+
+        return urlEncoded;
+    }
+
+    private static string SHA256Hash(string secret, string message)
+    {
+        var encoding = new System.Text.ASCIIEncoding();
+        byte[] keyByte = encoding.GetBytes(secret);
+        byte[] messageBytes = encoding.GetBytes(message);
+        // The instance of HMACSHA256 is constructed and disposed in this method because it is not thread safe
+        using var hmacsha256 = new HMACSHA256(keyByte);
+        byte[] hashmessage = hmacsha256.ComputeHash(messageBytes);
+        var hashString = Convert.ToBase64String(hashmessage).TrimEnd('=');
+        string urlEncoded = hashString.Replace("+", "-").Replace("/", "_");
+
+        return urlEncoded;
+    }
+
+    public class Claims
+    {
+        public string iss { get; set; }
+        public int exp { get; set; }
+        public string vxa { get; set; }
+        public int vxi { get; set; }
+        public string f { get; set; }
+        public string t { get; set; }
+        public string sub { get; set; }
+    }
+}
+
 [CloudScriptFunction("VivoxLogin")]
 public class VivoxLogin : ICloudScriptFunction<FYVivoxLoginTokenRequest, FYVivoxJoinData>
 {
-    public Task<FYVivoxJoinData> ExecuteAsync(FYVivoxLoginTokenRequest request)
+    public async Task<FYVivoxJoinData> ExecuteAsync(FYVivoxLoginTokenRequest request)
     {
-        return Task.FromResult(new FYVivoxJoinData
+        // TODO: Replace with app configuration
+        var channel = "sip:confctl-g-<issuer>.testchannel@mtu1xp.vivox.com"; // e - echo channel, g - global, p - positional
+        var exp = (int)DateTimeOffset.UtcNow.AddSeconds(90).ToUnixTimeSeconds();
+        var token = TokenGenerator.vxGenerateToken("key", "issuer", exp, "login", request.Username, channel);
+
+        return new FYVivoxJoinData
         {
-            
-        });
+            Request = new Models.Data.FYVivoxJoinTokenRequest{
+                Username = request.Username,
+                Channel = channel,
+                HasAudio = false,
+                HasText = true,
+                ChannelType = 2,
+                ChannelID = "testchannel",
+            },
+            Token = token
+        };
     }
 }