KdanCommon/DocAI/DocAI.cs

using KdanCommon.DocAI.Data;
using KdanCommon.Helpers;
using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net.Http;
using System.Net.Mime;
using System.Text;
using System.Threading.Tasks;
using Windows.Media.Protection.PlayReady;
using Windows.Storage;
using Windows.Web.Http.Headers;
using System.Xml.Linq;
using System.IO.Pipes;

namespace KdanCommon.DocAI
{
    public class DocAI
    {
        // DocAI website : https://kdanai.azurewebsites.net/swagger/index.html

        private static string DocAIDomain = "https://kdanai.azurewebsites.net";

        private HttpClient _httpClient = null;
        private string _appName = null;
        private string _appVersion = null;
        private string _platform = null;

        private Uri _verifyUserUri = null;
        private Uri _redactInfoExtractUri = null;

        public DocAI(string appName, string appVersion)
        {
            _httpClient = new HttpClient();
            _appName = appName;
            _appVersion = appVersion;
            _platform = "uwp";

            _verifyUserUri = new Uri($"{DocAIDomain}/verify_user");
            _redactInfoExtractUri = new Uri($"{DocAIDomain}/redact_info_extract");
        }

        ~DocAI()
        {
            _httpClient.Dispose();
        }

        #region Public Method
        public void SetAccessToken(string accessToken)
        {
            _httpClient.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Bearer", accessToken);
        }

        public async Task<VerifyUserResponse> VerifyUser()
        {
            VerifyUserResponse response = null;
            var result = await _httpClient.PostAsync(_verifyUserUri, new MultipartFormDataContent());
            if (result.StatusCode == System.Net.HttpStatusCode.OK)
            {
                var jsonString = await result.Content.ReadAsStringAsync();
                response = JsonTool.DeserializeJSON<VerifyUserResponse>(jsonString);
            }
            return response;
        }

        public async Task<RedactInfoExtractResponse> RedactInfoExtract(StorageFile file, string redactInfo, string docType, string pageRange = null, string redactCustomInfo = null)
        {
            RedactInfoExtractResponse response = null;
            using (var fileStream = await file.OpenStreamForReadAsync())
            {
                var content = new MultipartFormDataContent();
                var streamContent = new StreamContent(fileStream);
                streamContent.Headers.ContentDisposition = new System.Net.Http.Headers.ContentDispositionHeaderValue("form-data");
                streamContent.Headers.ContentDisposition.Name = "redact_file";
                streamContent.Headers.ContentDisposition.FileName = file.Name;
                content.Add(streamContent);
                content.Add(CreateStringContent(redactInfo, "redact_info"));
                content.Add(CreateStringContent(_appName, "app_name"));
                content.Add(CreateStringContent(_appVersion, "app_version"));
                content.Add(CreateStringContent(_platform, "platform"));
                content.Add(CreateStringContent(docType, "doc_type"));
                if (!string.IsNullOrEmpty(redactCustomInfo))
                    content.Add(CreateStringContent(redactCustomInfo, "redact_custom_info"));
                if (!string.IsNullOrEmpty(pageRange))
                    content.Add(CreateStringContent(pageRange, "page_range"));
                var result = await _httpClient.PostAsync(_redactInfoExtractUri, content);
                if (result.StatusCode == System.Net.HttpStatusCode.OK)
                {
                    var jsonString = await result.Content.ReadAsStringAsync();
                    response = JsonTool.DeserializeJSON<RedactInfoExtractResponse>(jsonString);
                }
            }
            return response;
        }

        #endregion

        #region Private Method
        private StringContent CreateStringContent(string content, string name)
        {
            var stringContent = new StringContent(content);
            stringContent.Headers.ContentDisposition = new System.Net.Http.Headers.ContentDispositionHeaderValue("form-data");
            stringContent.Headers.ContentDisposition.Name = name;
            return stringContent;
        }
        #endregion
    }
}