feat: freeze v1 transport contracts (#4)

Closes #4

src/FinalFactory.Rendezvous.Contracts/Http/SessionContracts.cs

@@ -0,0 +1,189 @@
+using System.Text.Json.Serialization;
+
+namespace FinalFactory.Rendezvous.Contracts;
+
+public sealed class SessionListing
+{
+    [JsonRequired]
+    public int ContractVersion { get; set; } = ContractLimits.ContractVersion;
+
+    [JsonRequired]
+    public SessionListingId ListingId { get; set; }
+
+    [JsonRequired]
+    public GameId GameId { get; set; }
+
+    [JsonRequired]
+    public EnvironmentId EnvironmentId { get; set; }
+
+    [JsonRequired]
+    public RegionId RegionId { get; set; }
+
+    [JsonRequired]
+    public uint ProtocolVersion { get; set; }
+
+    [JsonRequired]
+    public string BuildVersion { get; set; } = string.Empty;
+
+    [JsonRequired]
+    public string DisplayName { get; set; } = string.Empty;
+
+    [JsonRequired]
+    public ListingVisibility Visibility { get; set; }
+
+    [JsonRequired]
+    public PublisherTrustMode PublisherTrustMode { get; set; }
+
+    [JsonRequired]
+    public SessionCapacity Capacity { get; set; } = new();
+
+    [JsonRequired]
+    public Dictionary<string, string> Metadata { get; set; } = new(StringComparer.Ordinal);
+}
+
+public sealed class RegisterSessionRequest
+{
+    [JsonRequired]
+    public int ContractVersion { get; set; } = ContractLimits.ContractVersion;
+
+    [JsonRequired]
+    public string IdempotencyKey { get; set; } = string.Empty;
+
+    [JsonRequired]
+    public GameId GameId { get; set; }
+
+    [JsonRequired]
+    public EnvironmentId EnvironmentId { get; set; }
+
+    [JsonRequired]
+    public RegionId RegionId { get; set; }
+
+    [JsonRequired]
+    public uint ProtocolVersion { get; set; }
+
+    [JsonRequired]
+    public string BuildVersion { get; set; } = string.Empty;
+
+    [JsonRequired]
+    public string DisplayName { get; set; } = string.Empty;
+
+    [JsonRequired]
+    public ListingVisibility Visibility { get; set; }
+
+    [JsonRequired]
+    public SessionCapacity Capacity { get; set; } = new();
+
+    [JsonRequired]
+    public Dictionary<string, string> Metadata { get; set; } = new(StringComparer.Ordinal);
+}
+
+public sealed class RegisterSessionResponse
+{
+    [JsonRequired]
+    public int ContractVersion { get; set; } = ContractLimits.ContractVersion;
+
+    [JsonRequired]
+    public SessionListingId ListingId { get; set; }
+
+    [JsonRequired]
+    public LeaseId LeaseId { get; set; }
+
+    [JsonRequired]
+    public string LeaseToken { get; set; } = string.Empty;
+
+    [JsonRequired]
+    public MediationHandle HostPresenceHandle { get; set; }
+
+    [JsonRequired]
+    public string HostPresenceCapability { get; set; } = string.Empty;
+
+    [JsonRequired]
+    public DateTimeOffset ExpiresAt { get; set; }
+}
+
+public sealed class RenewLeaseRequest
+{
+    [JsonRequired]
+    public int ContractVersion { get; set; } = ContractLimits.ContractVersion;
+
+    [JsonRequired]
+    public string LeaseToken { get; set; } = string.Empty;
+}
+
+public sealed class RenewLeaseResponse
+{
+    [JsonRequired]
+    public int ContractVersion { get; set; } = ContractLimits.ContractVersion;
+
+    [JsonRequired]
+    public DateTimeOffset ExpiresAt { get; set; }
+}
+
+public sealed class UpdateSessionRequest
+{
+    [JsonRequired]
+    public int ContractVersion { get; set; } = ContractLimits.ContractVersion;
+
+    [JsonRequired]
+    public string LeaseToken { get; set; } = string.Empty;
+
+    [JsonRequired]
+    public string BuildVersion { get; set; } = string.Empty;
+
+    [JsonRequired]
+    public string DisplayName { get; set; } = string.Empty;
+
+    [JsonRequired]
+    public SessionCapacity Capacity { get; set; } = new();
+
+    [JsonRequired]
+    public Dictionary<string, string> Metadata { get; set; } = new(StringComparer.Ordinal);
+}
+
+public sealed class DeleteSessionRequest
+{
+    [JsonRequired]
+    public int ContractVersion { get; set; } = ContractLimits.ContractVersion;
+
+    [JsonRequired]
+    public string LeaseToken { get; set; } = string.Empty;
+}
+
+public sealed class BrowseSessionsRequest
+{
+    [JsonRequired]
+    public int ContractVersion { get; set; } = ContractLimits.ContractVersion;
+
+    [JsonRequired]
+    public GameId GameId { get; set; }
+
+    [JsonRequired]
+    public EnvironmentId EnvironmentId { get; set; }
+
+    [JsonRequired]
+    public uint ProtocolVersion { get; set; }
+    public RegionId? RegionId { get; set; }
+    public int PageSize { get; set; } = ContractLimits.BrowserPageMaxItems;
+
+    public string? Cursor { get; set; }
+}
+
+public sealed class BrowseSessionsResponse
+{
+    [JsonRequired]
+    public int ContractVersion { get; set; } = ContractLimits.ContractVersion;
+
+    [JsonRequired]
+    public List<SessionListing> Items { get; set; } = [];
+
+    public string? NextCursor { get; set; }
+}
+
+public sealed class GetSessionResponse
+{
+    [JsonRequired]
+    public int ContractVersion { get; set; } = ContractLimits.ContractVersion;
+
+    [JsonRequired]
+    public SessionListing Session { get; set; } = new();
+}