From 5181b31886f5f4cc31890bbe4810dd467996e903 Mon Sep 17 00:00:00 2001
From: Luke Pulverenti <luke.pulverenti@gmail.com>
Date: Mon, 13 Feb 2017 15:54:28 -0500
Subject: implement chrome media session api

---
 .../Services/StringMapTypeDeserializer.cs          | 124 +++++++++++++++++++++
 1 file changed, 124 insertions(+)
 create mode 100644 Emby.Server.Implementations/Services/StringMapTypeDeserializer.cs

(limited to 'Emby.Server.Implementations/Services/StringMapTypeDeserializer.cs')

diff --git a/Emby.Server.Implementations/Services/StringMapTypeDeserializer.cs b/Emby.Server.Implementations/Services/StringMapTypeDeserializer.cs
new file mode 100644
index 000000000..fc1cf4ed9
--- /dev/null
+++ b/Emby.Server.Implementations/Services/StringMapTypeDeserializer.cs
@@ -0,0 +1,124 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Reflection;
+
+namespace Emby.Server.Implementations.Services
+{
+    /// <summary>
+    /// Serializer cache of delegates required to create a type from a string map (e.g. for REST urls)
+    /// </summary>
+    public class StringMapTypeDeserializer
+    {
+        internal class PropertySerializerEntry
+        {
+            public PropertySerializerEntry(Action<object,object> propertySetFn, Func<string, object> propertyParseStringFn)
+            {
+                PropertySetFn = propertySetFn;
+                PropertyParseStringFn = propertyParseStringFn;
+            }
+
+            public Action<object, object> PropertySetFn;
+            public Func<string,object> PropertyParseStringFn;
+            public Type PropertyType;
+        }
+
+        private readonly Type type;
+        private readonly Dictionary<string, PropertySerializerEntry> propertySetterMap
+            = new Dictionary<string, PropertySerializerEntry>(StringComparer.OrdinalIgnoreCase);
+
+        public Func<string, object> GetParseFn(Type propertyType)
+        {
+            if (propertyType == typeof(string))
+                return s => s;
+
+            return _GetParseFn(propertyType);
+        }
+
+        private readonly Func<Type, object> _CreateInstanceFn;
+        private readonly Func<Type, Func<string, object>> _GetParseFn;
+
+        public StringMapTypeDeserializer(Func<Type, object> createInstanceFn, Func<Type, Func<string, object>> getParseFn, Type type)
+        {
+            _CreateInstanceFn = createInstanceFn;
+            _GetParseFn = getParseFn;
+            this.type = type;
+
+            foreach (var propertyInfo in RestPath.GetSerializableProperties(type))
+            {
+                var propertySetFn = TypeAccessor.GetSetPropertyMethod(type, propertyInfo);
+                var propertyType = propertyInfo.PropertyType;
+                var propertyParseStringFn = GetParseFn(propertyType);
+                var propertySerializer = new PropertySerializerEntry(propertySetFn, propertyParseStringFn) { PropertyType = propertyType };
+
+                propertySetterMap[propertyInfo.Name] = propertySerializer;
+            }
+        }
+
+        public object PopulateFromMap(object instance, IDictionary<string, string> keyValuePairs)
+        {
+            string propertyName = null;
+            string propertyTextValue = null;
+            PropertySerializerEntry propertySerializerEntry = null;
+
+            if (instance == null)
+                instance = _CreateInstanceFn(type);
+
+            foreach (var pair in keyValuePairs.Where(x => !string.IsNullOrEmpty(x.Value)))
+            {
+                propertyName = pair.Key;
+                propertyTextValue = pair.Value;
+
+                if (!propertySetterMap.TryGetValue(propertyName, out propertySerializerEntry))
+                {
+                    if (propertyName == "v")
+                    {
+                        continue;
+                    }
+
+                    continue;
+                }
+
+                if (propertySerializerEntry.PropertySetFn == null)
+                {
+                    continue;
+                }
+
+                if (propertySerializerEntry.PropertyType == typeof(bool))
+                {
+                    //InputExtensions.cs#530 MVC Checkbox helper emits extra hidden input field, generating 2 values, first is the real value
+                    propertyTextValue = LeftPart(propertyTextValue, ',');
+                }
+
+                var value = propertySerializerEntry.PropertyParseStringFn(propertyTextValue);
+                if (value == null)
+                {
+                    continue;
+                }
+                propertySerializerEntry.PropertySetFn(instance, value);
+            }
+
+            return instance;
+        }
+
+        public static string LeftPart(string strVal, char needle)
+        {
+            if (strVal == null) return null;
+            var pos = strVal.IndexOf(needle);
+            return pos == -1
+                ? strVal
+                : strVal.Substring(0, pos);
+        }
+    }
+
+    internal class TypeAccessor
+    {
+        public static Action<object, object> GetSetPropertyMethod(Type type, PropertyInfo propertyInfo)
+        {
+            if (!propertyInfo.CanWrite || propertyInfo.GetIndexParameters().Any()) return null;
+
+            var setMethodInfo = propertyInfo.SetMethod;
+            return (instance, value) => setMethodInfo.Invoke(instance, new[] { value });
+        }
+    }
+}
-- 
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