Web Push Protocol primitives

Author: tpeczek

Lib.Net.Http.WebPush/PushEncryptionKeyName.cs

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+namespace Lib.Net.Http.WebPush
+{
+    /// <summary>
+    /// The client keys shared as part of subscription.
+    /// </summary>
+    public enum PushEncryptionKeyName
+    {
+        /// <summary>
+        /// The client P-256 public key for use in ECDH.
+        /// </summary>
+        P256DH,
+        /// <summary>
+        /// The client authentication secret.
+        /// </summary>
+        Auth
+    }
+}

Lib.Net.Http.WebPush/PushMessage.cs

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+using System;
+
+namespace Lib.Net.Http.WebPush
+{
+    /// <summary>
+    /// Class representing a push message.
+    /// </summary>
+    public class PushMessage
+    {
+        #region Fields
+        private int? _timeToLive;
+        #endregion
+
+        #region Properties
+        /// <summary>
+        /// Gets or sets the content.
+        /// </summary>
+        public string Content { get; set; }
+
+        /// <summary>
+        /// Gets or sets the time (in seconds) for which the message should be retained by push service.
+        /// </summary>
+        public int? TimeToLive
+        {
+            get { return _timeToLive; }
+
+            set
+            {
+                if (value.HasValue && (value.Value < 0))
+                {
+                    throw new ArgumentOutOfRangeException(nameof(TimeToLive), "The TTL must be a non-negative integer");
+                }
+
+                _timeToLive = value;
+            }
+        }
+        #endregion
+
+        #region Constructors
+        /// <summary>
+        /// Creates new instance of <see cref="PushMessage"/> class.
+        /// </summary>
+        /// <param name="content">The content.</param>
+        public PushMessage(string content)
+        {
+            Content = content;
+        }
+        #endregion
+    }
+}

Lib.Net.Http.WebPush/PushSubscription.cs

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+using System.Collections.Generic;
+
+namespace Lib.Net.Http.WebPush
+{
+    /// <summary>
+    /// Class representing a push subscription
+    /// </summary>
+    public class PushSubscription
+    {
+        #region Properties
+        /// <summary>
+        /// Gets or sets the subscription endpoint.
+        /// </summary>
+        public string Endpoint { get; set; }
+
+        /// <summary>
+        /// Gets or sets client keys shared as part of subscription.
+        /// </summary>
+        public IDictionary<string, string> Keys { get; set; }
+        #endregion
+
+        #region Methods
+        /// <summary>
+        /// Gets specific client key shared as part of subscription.
+        /// </summary>
+        /// <param name="keyName">The key name.</param>
+        /// <returns>The key.</returns>
+        public string GetKey(PushEncryptionKeyName keyName)
+        {
+            string key = null;
+
+            if (Keys != null)
+            {
+                string keyNameStringified = StringifyKeyName(keyName);
+
+                if (Keys.ContainsKey(keyNameStringified))
+                {
+                    key = Keys[keyNameStringified];
+                }
+            }
+
+            return key;
+        }
+
+        /// <summary>
+        /// Sets specific client key shared as part of subscription.
+        /// </summary>
+        /// <param name="keyName">The key name.</param>
+        /// <param name="key">The key.</param>
+        public void SetKey(PushEncryptionKeyName keyName, string key)
+        {
+            if (Keys == null)
+            {
+                Keys = new Dictionary<string, string>();
+            }
+
+            Keys[StringifyKeyName(keyName)] = key;
+        }
+
+        private string StringifyKeyName(PushEncryptionKeyName keyName)
+        {
+            return keyName.ToString().ToLowerInvariant();
+        }
+        #endregion
+    }
+}