Add imdbid validation

src/Jackett/Controllers/TorznabController.cs

@@ -1,6 +1,7 @@
 using AutoMapper;
 using Jackett.Models;
 using Jackett.Services;
+using Jackett.Utils;
 using NLog;
 using System;
 using System.Collections.Generic;
@@ -12,7 +13,8 @@ using System.Text;
 using System.Threading.Tasks;
 using System.Web;
 using System.Web.Http;
-
+using System.Xml.Linq;
+
 namespace Jackett.Controllers
 {
     [AllowAnonymous]
@@ -32,6 +34,24 @@ namespace Jackett.Controllers
             cacheService = c;
         }
 
+        public HttpResponseMessage GetErrorXML(int code, string description)
+        {
+            var xdoc = new XDocument(
+                new XDeclaration("1.0", "UTF-8", null),
+                new XElement("error",
+                    new XAttribute("code", code.ToString()),
+                    new XAttribute("description", description)
+                )
+            );
+
+            var xml = xdoc.Declaration.ToString() + Environment.NewLine + xdoc.ToString();
+
+            return new HttpResponseMessage()
+            {
+                Content = new StringContent(xml, Encoding.UTF8, "application/xml")
+            };
+        }
+
         [HttpGet]
         public async Task<HttpResponseMessage> Call(string indexerID)
         {
@@ -62,6 +82,27 @@ namespace Jackett.Controllers
             {
                 logger.Warn(string.Format("Rejected a request to {0} which is unconfigured.", indexer.DisplayName));
                 return Request.CreateResponse(HttpStatusCode.Forbidden, "This indexer is not configured.");
+            }
+
+            if (torznabQuery.ImdbID != null)
+            {
+                if (torznabQuery.QueryType != "movie")
+                {
+                    logger.Warn(string.Format("A non movie request with an imdbid was made from {0}.", Request.GetOwinContext().Request.RemoteIpAddress));
+                    return GetErrorXML(201, "Incorrect parameter: only movie-search supports the imdbid parameter");
+                }
+
+                if (torznabQuery.SearchTerm != null)
+                {
+                    logger.Warn(string.Format("A movie-search request from {0} was made contining q and imdbid.", Request.GetOwinContext().Request.RemoteIpAddress));
+                    return GetErrorXML(201, "Incorrect parameter: please specify either imdbid or q");
+                }
+
+                if (ParseUtil.GetImdbID(torznabQuery.ImdbID) == null)
+                {
+                    logger.Warn(string.Format("A movie-search request from {0} was made with an invalid imdbid.", Request.GetOwinContext().Request.RemoteIpAddress));
+                    return GetErrorXML(201, "Incorrect parameter: invalid imdbid format");
+                }
             }
 
             var releases = await indexer.PerformQuery(torznabQuery);

src/Jackett/Utils/ParseUtil.cs

@@ -9,6 +9,7 @@ namespace Jackett.Utils
             new Regex(
                 @"(?<![\uD800-\uDBFF])[\uDC00-\uDFFF]|[\uD800-\uDBFF](?![\uDC00-\uDFFF])|[\x00-\x08\x0B\x0C\x0E-\x1F\x7F-\x9F\uFEFF\uFFFE\uFFFF]",
                 RegexOptions.Compiled);
+        private static readonly Regex ImdbId = new Regex(@"^tt(\d{7})$",RegexOptions.Compiled);
 
         public static string NormalizeSpace(string s)
         {
@@ -72,5 +73,14 @@ namespace Jackett.Utils
         {
             return long.TryParse(NormalizeNumber(str), NumberStyles.Any, CultureInfo.InvariantCulture, out result);
         }
+
+        public static int? GetImdbID(string imdbstr)
+        {
+            var match = ImdbId.Match(imdbstr);
+            if (!match.Success)
+                return null;
+
+            return CoerceInt(match.Groups[1].Value);
+        }
     }
 }