Provide connection options to host process (#267)

* Stage changes to other machine

* Add connection options in init message

* Fix option type

src/Microsoft.SqlTools.Hosting/Hosting/Contracts/CapabilitiesRequest.cs

@@ -0,0 +1,29 @@
+//
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
+
+using Microsoft.SqlTools.Hosting.Protocol.Contracts;
+
+namespace Microsoft.SqlTools.Hosting.Contracts
+{
+    /// <summary>
+    /// Defines a message that is sent from the client to request
+    /// the version of the server.
+    /// </summary>
+    public class CapabilitiesRequest
+    {
+        public static readonly
+           RequestType<CapabilitiesRequest, CapabilitiesResult> Type =
+            RequestType<CapabilitiesRequest, CapabilitiesResult>.Create("capabilities/list");
+
+        public string HostName { get; set; }
+
+        public string HostVersion { get; set; }
+    }
+
+    public class CapabilitiesResult
+    {
+        public DmpServerCapabilities Capabilities { get; set; }
+    }    
+}

src/Microsoft.SqlTools.Hosting/Hosting/Contracts/ConnectionProviderOptions.cs

@@ -0,0 +1,67 @@
+//
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
+
+namespace Microsoft.SqlTools.Hosting.Contracts
+{
+    /// <summary>
+    /// Defines the connection provider options that the DMP server
+    /// implements.  This includes metadata regarding supported connection
+    /// properties.
+    /// </summary>
+    public class ConnectionProviderOptions
+    {
+        public ConnectionOption[] Options { get; set; }
+    }
+
+    public class ConnectionOption
+    {
+        public static readonly string ValueTypeString = "string";
+        public static readonly string ValueTypeMultiString = "multistring";
+        public static readonly string ValueTypePassword = "password";
+        public static readonly string ValueTypeNumber = "number";
+        public static readonly string ValueTypeCategory = "category";
+        public static readonly string ValueTypeBoolean = "boolean";
+
+        public static readonly string SpecialValueServerName = "serverName";
+        public static readonly string SpecialValueDatabaseName = "databaseName";
+        public static readonly string SpecialValueAuthType = "authType";
+        public static readonly string SpecialValueUserName = "userName";
+        public static readonly string SpecialValuePasswordName = "password";
+
+        public string Name { get; set; }
+
+        public string DisplayName { get; set; }
+
+        /// <summary>
+        /// Type of the parameter.  Can be either string, number, or category.
+        /// </summary>
+        public string ValueType { get; set; }
+
+        public string DefaultValue { get; set; }
+
+        /// <summary>
+        /// Set of permitted values if ValueType is category.
+        /// </summary>
+        public string[] CategoryValues { get; set; }
+
+        /// <summary>
+        /// Determines if the parameter is one of the 'specical' known values.
+        /// Can be either Server Name, Database Name, Authentication Type,
+        /// User Name, or Password
+        /// </summary>
+        public string SpecialValueType { get; set; }
+
+        /// <summary>
+        /// Flag to indicate that this option is part of the connection identity
+        /// </summary>
+        public bool IsIdentity { get; set; }
+
+        /// <summary>
+        /// Flag to indicate that this option is required
+        /// </summary>
+        public bool IsRequired { get; set; }   
+    }
+}
+

src/Microsoft.SqlTools.Hosting/Hosting/Contracts/DmpServerCapabilities.cs

@@ -5,11 +5,17 @@
 
 namespace Microsoft.SqlTools.Hosting.Contracts
 {
+    /// <summary>
+    /// Defines the DMP server capabilities
+    /// </summary>
     public class DmpServerCapabilities
     {
-        public string ProviderName { get; set; 
-        }
-        public bool? HoverProvider { get; set; }
+        public string ProtocolVersion { get; set; }
+
+        public string ProviderName { get; set; }
+
+        public string ProviderDisplayName { get; set; }
+
+        public ConnectionProviderOptions ConnectionProvider { get; set; }
     }
 }
-