Merge pull request #695 from TechnologyEnhancedLearning/Develop/Fixes/TD-4945-CORS-Policy-Issue-on-iPhone-LandingPage

TD-4945: CORS Policy Issue on iPhone Landing Page

Author: ArunimaGeorge

LearningHub.Nhs.WebUI/Controllers/Api/MediaManifestProxyController.cs

@@ -14,7 +14,6 @@
     /// <summary>
     /// Defines the <see cref="MediaManifestProxyController" />.
     /// </summary>
-    [Authorize]
     [Route("api/[controller]")]
     [ApiController]
     public class MediaManifestProxyController : ControllerBase
@@ -37,6 +36,7 @@ public MediaManifestProxyController(ILogger<MediaManifestProxyController> logger
         /// <param name="playBackUrl">The playBackUrl.</param>
         /// <param name="token">The token.</param>
         /// <returns>The MediaManifestProxy string.</returns>
+        [Authorize]
         public string Get(string playBackUrl, string token)
         {
             this.logger.LogDebug($"playBackUrl={playBackUrl} token={token}");
@@ -103,6 +103,80 @@ public string Get(string playBackUrl, string token)
             return null;
         }
 
+        /// <summary>
+        /// The LandingPageGet.
+        /// </summary>
+        /// <param name="playBackUrl">The playBackUrl.</param>
+        /// <param name="token">The token.</param>
+        /// <returns>The MediaManifestProxy string.</returns>
+        [HttpGet]
+        [Route("LandingPageGet")]
+        public string LandingPageGet(string playBackUrl, string token)
+        {
+            this.logger.LogDebug($"playBackUrl={playBackUrl} token={token}");
+            var httpRequest = (HttpWebRequest)WebRequest.Create(new Uri(playBackUrl));
+            httpRequest.CachePolicy = new HttpRequestCachePolicy(HttpRequestCacheLevel.NoCacheNoStore);
+            httpRequest.Timeout = 30000;
+
+            var httpResponse = httpRequest.GetResponse();
+
+            try
+            {
+                this.logger.LogDebug($"Calling httpResponse.GetResponseStream(): playBackUrl={playBackUrl} ");
+                var stream = httpResponse.GetResponseStream();
+                if (stream != null)
+                {
+                    using (var reader = new StreamReader(stream))
+                    {
+                        const string qualityLevelRegex = @"(|)([^""\s]+\.m3u8\(encryption=cbc\))";
+                        const string fragmentsRegex = @"(Fragments\([\w\d=-]+,[\w\d=-]+\))";
+                        const string urlRegex = @"(https?:\/\/[\da-z\.-]+\.[a-z\.]{2,6}[\/\w \.-]*\?[^,\s""]*)";
+
+                        var baseUrl = playBackUrl.Substring(0, playBackUrl.IndexOf(".ism", System.StringComparison.OrdinalIgnoreCase)) + ".ism";
+                        this.logger.LogDebug($"baseUrl={baseUrl}");
+
+                        var content = reader.ReadToEnd();
+
+                        content = ReplaceUrisWithProxy(content, baseUrl);
+                        var newContent = Regex.Replace(content, urlRegex, match =>
+                        {
+                            string baseUrlWithQuery = match.Groups[1].Value;  // URL including the query string
+
+                            // Append the token correctly without modifying surrounding characters
+                            string newUrl = baseUrlWithQuery.Contains("?") ?
+                                            $"{baseUrlWithQuery}&token={token}" :
+                                            $"{baseUrlWithQuery}?token={token}";
+
+                            return newUrl;
+                        });
+
+                        this.logger.LogDebug($"newContent={newContent}");
+
+                        var match = Regex.Match(playBackUrl, qualityLevelRegex);
+                        if (match.Success)
+                        {
+                            this.logger.LogDebug($"match.Success");
+                            var qualityLevel = match.Groups[0].Value;
+                            newContent = Regex.Replace(newContent, fragmentsRegex, m => string.Format(CultureInfo.InvariantCulture, baseUrl + "/" + qualityLevel + "/" + m.Value));
+                            this.logger.LogDebug($"Updated newContent={newContent}");
+                        }
+
+                        return newContent;
+                    }
+                }
+            }
+            catch (Exception ex)
+            {
+                this.logger.LogError(ex.Message);
+            }
+            finally
+            {
+                httpResponse.Close();
+            }
+
+            return null;
+        }
+
         private static string ReplaceUrisWithProxy(string playlistContent, string proxyUrl)
         {
             // Split the playlist content into lines

LearningHub.Nhs.WebUI/Controllers/MediaController.cs

@@ -39,16 +39,25 @@ public MediaController(IWebHostEnvironment hostingEnvironment, ILogger<MediaCont
         /// <param name="playBackUrl">The playBackUrl.</param>
         /// <param name="token">The token.</param>
         /// <param name="origin">The orgin node.</param>
+        /// <param name="isLandingPage">The isLandingPage.</param>
         /// <returns>The <see cref="IActionResult"/>.</returns>
         [Route("Media/MediaManifest")]
-        public IActionResult MediaManifest(string playBackUrl, string token, string origin = "*")
+        public IActionResult MediaManifest(string playBackUrl, string token, string origin = "*", bool isLandingPage = false)
         {
             try
             {
                 this.Logger.LogDebug($"playBackUrl={playBackUrl} token={token}");
                 var hostPortion = this.Request.Host;
+                var manifestProxyUrl = string.Empty;
+                if (isLandingPage)
+                {
+                    manifestProxyUrl = string.Format("https://{0}/api/MediaManifestProxy/LandingPageGet", hostPortion);
+                }
+                else
+                {
+                    manifestProxyUrl = string.Format("https://{0}/api/MediaManifestProxy", hostPortion);
+                }
 
-                var manifestProxyUrl = string.Format("https://{0}/api/MediaManifestProxy", hostPortion);
                 this.Logger.LogDebug($"manifestProxyUrl={manifestProxyUrl}");
 
                 var modifiedTopLeveLManifest = this.azureMediaService.GetTopLevelManifestForToken(manifestProxyUrl, playBackUrl, token);

LearningHub.Nhs.WebUI/Views/Home/_CmsVideo.cshtml

@@ -108,7 +108,7 @@
 
     if (checkIfIphone()) {
         var token = model.videoAsset.azureMediaAsset.authenticationToken;
-        url = '@requestURL' + "Media/MediaManifest?playBackUrl=" + url + "&token=" + token + "&origin=" + '@requestURL';
+        url = '@requestURL' + "Media/MediaManifest?playBackUrl=" + url + "&token=" + token + "&origin=" + '@requestURL' + "&isLandingPage=" + true;
     }
     var subtitleTrack = null;
     if (model.videoAsset.azureMediaAsset && model.videoAsset.closedCaptionsFile) {