Spotify.NET/SpotifyAPI.Web/Models/Request/RequestParams.cs

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using System;
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using System.Collections;
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using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
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using Newtonsoft.Json.Linq;
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namespace SpotifyAPI.Web
{
public abstract class RequestParams
{
private static readonly ConcurrentDictionary<Type, List<(PropertyInfo, BodyParamAttribute)>> _bodyParamsCache =
new();
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public JObject BuildBodyParams()
{
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// Make sure everything is okay before building body params
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CustomEnsure();
var body = new JObject();
var type = GetType();
if (!_bodyParamsCache.IsEmpty && _bodyParamsCache.TryGetValue(type, out var bodyParamsCached))
{
foreach (var (info, attribute) in bodyParamsCached)
{
AddBodyParam(body, info, attribute);
}
}
else
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{
var bodyProps = GetType()
.GetProperties(BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.Public)
.Where(prop => prop.GetCustomAttributes(typeof(BodyParamAttribute), true).Length > 0);
var cachedParams = new List<(PropertyInfo, BodyParamAttribute)>();
foreach (var prop in bodyProps)
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{
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var attribute = prop.GetCustomAttribute<BodyParamAttribute>();
if (attribute != null)
{
cachedParams.Add((prop, attribute));
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AddBodyParam(body, prop, attribute);
}
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}
_bodyParamsCache[type] = cachedParams;
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}
return body;
}
private void AddBodyParam(JObject body, PropertyInfo prop, BodyParamAttribute attribute)
{
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object? value = prop.GetValue(this);
if (value != null)
{
body[attribute.Key ?? prop.Name] = JToken.FromObject(value);
}
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}
private static readonly ConcurrentDictionary<Type, List<(PropertyInfo, QueryParamAttribute)>> _queryParamsCache =
new();
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public Dictionary<string, string> BuildQueryParams()
{
// Make sure everything is okay before building query params
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CustomEnsure();
var queryParams = new Dictionary<string, string>();
var type = GetType();
if (!_queryParamsCache.IsEmpty && _queryParamsCache.TryGetValue(type, out var queryParamsCached))
{
foreach (var (info, attribute) in queryParamsCached)
{
AddQueryParam(queryParams, info, attribute);
}
}
else
{
var queryProps = GetType().GetProperties(BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.Public)
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.Where(prop => prop.GetCustomAttributes(typeof(QueryParamAttribute), true).Length > 0);
var cachedParams = new List<(PropertyInfo, QueryParamAttribute)>();
foreach (var prop in queryProps)
{
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var attribute = prop.GetCustomAttribute<QueryParamAttribute>();
if (attribute != null)
{
cachedParams.Add((prop, attribute));
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AddQueryParam(queryParams, prop, attribute);
}
}
_queryParamsCache[type] = cachedParams;
}
AddCustomQueryParams(queryParams);
return queryParams;
}
private void AddQueryParam(Dictionary<string, string> queryParams, PropertyInfo prop, QueryParamAttribute attribute)
{
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object? value = prop.GetValue(this);
if (value != null)
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{
if (value is IList<string> list)
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{
if (list.Count > 0)
{
var str = string.Join(",", list);
queryParams.Add(attribute.Key ?? prop.Name, str);
}
}
else if (value is bool valueAsBool)
{
queryParams.Add(attribute.Key ?? prop.Name, valueAsBool ? "true" : "false");
}
else if (value is Enum valueAsEnum)
{
var enumType = valueAsEnum.GetType();
var valueList = new List<string>();
if (enumType.IsDefined(typeof(FlagsAttribute), false))
{
foreach (Enum enumVal in Enum.GetValues(valueAsEnum.GetType()))
{
if (valueAsEnum.HasFlag(enumVal))
{
if (StringAttribute.GetValue(enumType, enumVal, out var stringVal))
{
// .netstandard2.0 requires !
valueList.Add(stringVal!);
}
}
}
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}
else
{
if (StringAttribute.GetValue(enumType, valueAsEnum, out var stringVal))
{
// .netstandard2.0 requires !
valueList.Add(stringVal!);
}
}
queryParams.Add(attribute.Key ?? prop.Name, string.Join(",", valueList));
}
else
{
queryParams.Add(attribute.Key ?? prop.Name, value.ToString() ?? throw new APIException("ToString returned null for query parameter"));
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}
}
}
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protected virtual void CustomEnsure() { }
protected virtual void AddCustomQueryParams(Dictionary<string, string> queryParams) { }
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}
[AttributeUsage(AttributeTargets.Property)]
public sealed class QueryParamAttribute : Attribute
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{
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public string Key { get; }
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public QueryParamAttribute(string key)
{
Key = key;
}
}
[AttributeUsage(AttributeTargets.Property)]
public sealed class BodyParamAttribute : Attribute
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{
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public string Key { get; }
public BodyParamAttribute(string key)
{
Key = key;
}
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}
}
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