csharp/Azure/ConferenceBuddy/ConferenceBuddy/ConferenceBuddy.Core/Services/VideoIndexerService.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Threading.Tasks;

using Microsoft.ConferenceBuddy.Common.Models;
using Microsoft.ConferenceBuddy.Common.Utilities;

namespace Microsoft.ConferenceBuddy.Core.Services
{
    public clast VideoIndexerService : ServiceBase
    {
        /// 
        /// The constructor of the Video Indexer Service
        /// 
        public VideoIndexerService(string serviceUrl, string subscriptionKey)
        {
            if (string.IsNullOrEmpty(serviceUrl) == true)
            {
                throw new ArgumentNullException("Service url is not initialized.");
            }

            if (string.IsNullOrEmpty(subscriptionKey) == true)
            {
                throw new ArgumentNullException("Subscription key is not initialized.");
            }

            this.BaseServiceUrl = serviceUrl;
            this.RequestHeaders = new Dictionary()
            {
                {  this.HEADER_SUB_KEY, subscriptionKey }
            };
        }

        public async Task SearchAsync(string query = "", string face = "")
        {
            if (string.IsNullOrEmpty(query) == true && string.IsNullOrEmpty(face) == true)
            {
                return default(VideoIndexerSearchResult);
            }

            Dictionary queryParams = new Dictionary()
            {
                { "query", WebUtility.UrlEncode(query) },
                { "face", WebUtility.UrlEncode(face) },
            };

            IEnumerable queryString = queryParams
                .Where(p => string.IsNullOrEmpty(p.Value) == false)
                .Select(p => p.Key + "=" + p.Value);

            string searchQuery = queryString.Count() == 1 ? queryString.FirstOrDefault() : string.Join("&", queryString);

            // Get request uri
            string searchUrl = this.BaseServiceUrl + "?" + searchQuery;
            Uri requestUri = new Uri(searchUrl);

            // Get response
            VideoIndexerSearchResult result = await HttpClientUtility.GetAsync(requestUri, this.RequestHeaders);
            return result;
        }
    }
}