server/AyaNova/biz/ReportBiz.cs

@@ -1,9 +1,12 @@
 using System.Threading.Tasks;
 using System.Linq;
+using System.IO;
 using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Logging;
 using AyaNova.Util;
 using AyaNova.Api.ControllerHelpers;
 using AyaNova.Models;
+using PuppeteerSharp;
 
 namespace AyaNova.Biz
 {
@@ -230,6 +233,74 @@ namespace AyaNova.Biz
 			so the route just calls the biz object which handles processing, getting data, checking rights and then making the report and either attaching it to an email (maybe I do need that temp server folder after all) 
 			or return to route to return to Client end
         */
+        public async Task<byte[]> RenderReport(long reportId, long[] objectidarray, string apiUrl)
+        {
+
+            //get report, vet security, see what we need before init in case of issue
+
+
+            //initialization
+            var log = AyaNova.Util.ApplicationLogging.CreateLogger("ReportBiz::RenderReport");
+            log.LogDebug("Initializing report system");
+            var ReportJSFolderPath = Path.Combine(ServerBootConfig.AYANOVA_CONTENT_ROOT_PATH, "resource", "rpt");
+            var lo = new LaunchOptions { Headless = true };
+            bool isWindows = System.Runtime.InteropServices.RuntimeInformation.IsOSPlatform(System.Runtime.InteropServices.OSPlatform.Windows);
+            if (!isWindows)
+            {
+                log.LogDebug($"Not Windows: setting executable path for chrome to expected '/usr/bin/chromium-browser'");
+                lo.ExecutablePath = "/usr/bin/chromium-browser";//this is the default path for docker based alpine dist, but maybe not others, need to make a config setting likely
+                lo.Args = new string[] { "--no-sandbox" };
+            }
+            else
+            {
+                log.LogDebug($"Windows: Calling browserFetcher download async now:");
+                await new BrowserFetcher().DownloadAsync(BrowserFetcher.DefaultRevision);
+            }
+
+
+            log.LogDebug($"Launching headless Chrome now:");
+            using (var browser = await Puppeteer.LaunchAsync(lo))
+            using (var page = await browser.NewPageAsync())
+            {
+                log.LogDebug($"Preparing page: adding base reporting scripts to page");
+
+                //Add Handlebars JS for compiling and presenting
+                await page.AddScriptTagAsync(new AddTagOptions() { Path = Path.Combine(ReportJSFolderPath, "ay-hb.js") });
+
+                //add Marked for markdown processing
+                await page.AddScriptTagAsync(new AddTagOptions() { Path = Path.Combine(ReportJSFolderPath, "ay-md.js") });
+
+                //add stock helpers
+                await page.AddScriptTagAsync(new AddTagOptions() { Path = Path.Combine(ReportJSFolderPath, "ay-report.js") });
+
+                //execute to add to handlebars
+                await page.EvaluateExpressionAsync("ayRegisterHelpers();");
+
+                log.LogDebug($"Preparing page: adding this report's scripts, style and templates to page");
+
+
+
+                //compile and run handlebars template              
+                var compileScript = $"Handlebars.compile({reportTemplate})({reportData});";
+                var resultHTML = await page.EvaluateExpressionAsync<string>(compileScript);
+
+                //render report as HTML              
+                await page.SetContentAsync(resultHTML);
+
+                //add style (after page or it won't work)
+                await page.AddStyleTagAsync(new AddTagOptions { Content = reportCSS });
+
+                //useful for debugging purposes only
+                //var pagecontent = await page.GetContentAsync();
+
+                //render to pdf and return
+                var pdfBuffer = await page.PdfDataAsync();
+                log.LogInformation($"returning results now:");
+                return new FileContentResult(pdfBuffer, "application/pdf");
+
+            }
+            return null;
+        }