OnDoc/API_NetFramework/Controllers/JsonController.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Http;
using System.Web.Mvc;

using System.Configuration;
using System.Data.SqlClient;
using System.IO;
using System.Net;
using System.Net.Http;
using System.Text;
using SecuringWebApiUsingApiKey.Middleware;
using System.Threading.Tasks;
using Model;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using System.Web.Http.Results;
using System.Net.Http.Headers;


namespace OnDocAPI_NetFramework.Controllers
{
    public class JsonRequestDto
    {
        public string Key { get; set; }
        public string Json { get; set; }
    }

    [System.Web.Http.RoutePrefix("api/json")]
    public class JsonController : ApiController
    {

        private readonly string _connectionString = StringCipher.Decrypt(ConfigurationManager.ConnectionStrings["DocTesterconnectionstring"].ConnectionString, "i%!k!7pab%bNLdA5hE4pkR4XaB%E^jB3d9tHuQ4pbF&BZjF7SB#WBWit5#HrbJiLrLVm");

        // 🔹 JSON LESEN
        [System.Web.Http.HttpGet]
        [System.Web.Http.Route("load/{key}")]
        public IHttpActionResult LoadJson(string key)
        {
            if (string.IsNullOrWhiteSpace(key))
                return BadRequest("Key fehlt");

            string json;

            using (SqlConnection con = new SqlConnection(_connectionString))
            using (SqlCommand cmd = new SqlCommand(
                "SELECT JavaScriptObject FROM ProvDokuments WHERE ProvDokumentid = @key", con))
            {
                cmd.Parameters.AddWithValue("@key", key);
                con.Open();
                json = cmd.ExecuteScalar()?.ToString();
            }

            if (json == null)
                return NotFound();

            return Ok(json);
        }

        // 🔹 JSON SPEICHERN
        [System.Web.Http.HttpPost]
        [System.Web.Http.Route("save")]
        public IHttpActionResult SaveJson(JsonRequestDto dto)
        {
            if (dto == null || string.IsNullOrWhiteSpace(dto.Key))
                return BadRequest("Key fehlt");

            using (SqlConnection con = new SqlConnection(_connectionString))
            using (SqlCommand cmd = new SqlCommand(@"
IF EXISTS (SELECT 1 FROM provdokuments WHERE provdokumentid = @key)
    UPDATE provdokuments SET JavaScriptObject = @json, geaendertam = GETDATE()
    WHERE provdokumentid = @key
ELSE
    INSERT INTO provdokuments (provdokumentid,erstelltam,geaendertam, JavaScriptObject)
    VALUES (@key, getdate(),getdate(),@json)
", con))
            {
                cmd.Parameters.AddWithValue("@key", dto.Key);
                cmd.Parameters.AddWithValue("@json", dto.Json);
                con.Open();
                cmd.ExecuteNonQuery();
            }

            return Ok();
        }

        public class JsonRequestDto
        {
            public string Key { get; set; }
            public string Json { get; set; } // ← reiner JSON-String
        }
        public class PdfBase64Response
        {
            public string PdfBase64 { get; set; }
        }
        // 🔹 PDF GENERIEREN
        [System.Web.Http.HttpPost]
        [System.Web.Http.Route("GeneratePDF")]
        public async Task<HttpResponseMessage> GeneratePdf(JsonRequestDto dto)
        {
            if (dto == null || string.IsNullOrWhiteSpace(dto.Json))
                return new HttpResponseMessage(HttpStatusCode.BadRequest);

            byte[] pdfBytes = await CallExternalPdfApi(dto.Json);

            var response = new HttpResponseMessage(HttpStatusCode.OK)
            {
                Content = new ByteArrayContent(pdfBytes)
            };
        
       
            response.Content.Headers.ContentType =
                new MediaTypeHeaderValue("application/pdf");

            response.Content.Headers.ContentDisposition =
                new ContentDispositionHeaderValue("inline")
                {
                    FileName = $"{dto.Key}.pdf"
                };
            response.Content.Headers.ContentLength = pdfBytes.Length;
          
            return response;
        }


        private async Task<byte[]> CallExternalPdfApi(string json)
        {
            try
            {
                APIErrorSimple apireturn = new APIErrorSimple();
                APIOK apiok = new APIOK();
                ;
                string jsonstring = json;

                WebRequest request;

                var data = Encoding.UTF8.GetBytes(jsonstring);
                string OwnHost = System.Configuration.ConfigurationManager.AppSettings["OwnHost"].ToString();
                string uri = OwnHost + "/API/CreateCLM";
                uri = OwnHost + "/API/DokumentGenerator";
                request = WebRequest.Create(uri);
                request.ContentLength = data.Length;
                request.ContentType = "application/json";
                request.Method = "POST";
                request.Headers["Authorization"] = "Bearer " + "pZkuG6l6ORCEckqQimPK58PO1A9EnkMtL5oCgRX9WiWnD4xeH7ikGzhWnTBy/vk8J4Iiz8gCSx9uFHA4+DvITG0roO97sk82d/0BCjVlwLWINpXlJfGYEF3X96AdoCQvb3ruwv/tVqEHsSU5aNfyxBAe+EhLTHQ8t7ysgJZWh98=";
                using (Stream requestStream = request.GetRequestStream())
                {
                    requestStream.Write(data, 0, data.Length);
                    requestStream.Close();

                    using (Stream responseStream = request.GetResponse().GetResponseStream())
                    {
                        using (var reader = new StreamReader(responseStream))
                        {
                            var response = reader.ReadToEnd();
                            try
                            {
                                
                                
                                apiok = JsonConvert.DeserializeObject<APIOK>(response);
                                var jo = JObject.Parse(response.ToString());

                                return Convert.FromBase64String(apiok.file);
                            }
                            catch (Exception ex)
                            {
                                apireturn = JsonConvert.DeserializeObject<APIErrorSimple>(response);
                            }
                        }
                    }
                }
                return null;
            }
            catch {
                byte[] pdf;
                return null;}


            //    var request = (HttpWebRequest)WebRequest.Create("https://api.example.com/generate-pdf");
            //request.Method = "POST";
            //request.ContentType = "application/json";

            //byte[] payload = Encoding.UTF8.GetBytes(json);
            //request.ContentLength = payload.Length;

            //using (var stream = request.GetRequestStream())
            //    stream.Write(payload, 0, payload.Length);

            //using (var response = (HttpWebResponse)request.GetResponse())
            //using (var rs = response.GetResponseStream())
            //using (var ms = new MemoryStream())
            //{
            //    rs.CopyTo(ms);
            //    return ms.ToArray();
            //}
        }
    }
}