feat(indexer): add book/audiobook search criteria

Add search criteria classes and update request generators:
- BookSearchCriteria (Author, Title, ISBN, Publisher, Year)
- AudiobookSearchCriteria (Author, Title, Narrator, ASIN, ISBN)
- Updated IIndexerRequestGenerator interface
- Implemented book/audiobook search in NewznabRequestGenerator
- Added stub implementations to all other request generators

src/NzbDrone.Core/IndexerSearch/Definitions/AudiobookSearchCriteria.cs

@@ -0,0 +1,34 @@
+namespace NzbDrone.Core.IndexerSearch.Definitions
+{
+    public class AudiobookSearchCriteria : SearchCriteriaBase
+    {
+        public string Author { get; set; }
+        public string Title { get; set; }
+        public string Narrator { get; set; }
+        public string ASIN { get; set; }
+        public string ISBN { get; set; }
+        public int? Year { get; set; }
+        public bool? Abridged { get; set; }
+
+        public override string ToString()
+        {
+            if (!string.IsNullOrWhiteSpace(Author) && !string.IsNullOrWhiteSpace(Title))
+            {
+                var result = $"[{Author} - {Title}";
+                if (!string.IsNullOrWhiteSpace(Narrator))
+                {
+                    result += $" (narrated by {Narrator})";
+                }
+
+                return result + "]";
+            }
+
+            if (!string.IsNullOrWhiteSpace(ASIN))
+            {
+                return $"[ASIN: {ASIN}]";
+            }
+
+            return $"[{Title ?? Author ?? "Unknown"}]";
+        }
+    }
+}

src/NzbDrone.Core/IndexerSearch/Definitions/BookSearchCriteria.cs

@@ -0,0 +1,26 @@
+namespace NzbDrone.Core.IndexerSearch.Definitions
+{
+    public class BookSearchCriteria : SearchCriteriaBase
+    {
+        public string Author { get; set; }
+        public string Title { get; set; }
+        public string ISBN { get; set; }
+        public string Publisher { get; set; }
+        public int? Year { get; set; }
+
+        public override string ToString()
+        {
+            if (!string.IsNullOrWhiteSpace(Author) && !string.IsNullOrWhiteSpace(Title))
+            {
+                return $"[{Author} - {Title}]";
+            }
+
+            if (!string.IsNullOrWhiteSpace(ISBN))
+            {
+                return $"[ISBN: {ISBN}]";
+            }
+
+            return $"[{Title ?? Author ?? "Unknown"}]";
+        }
+    }
+}

src/NzbDrone.Core/Indexers/FileList/FileListRequestGenerator.cs

@@ -40,6 +40,16 @@ public virtual IndexerPageableRequestChain GetSearchRequests(MovieSearchCriteria
             return pageableRequests;
         }
 
+        public IndexerPageableRequestChain GetSearchRequests(BookSearchCriteria searchCriteria)
+        {
+            return new IndexerPageableRequestChain();
+        }
+
+        public IndexerPageableRequestChain GetSearchRequests(AudiobookSearchCriteria searchCriteria)
+        {
+            return new IndexerPageableRequestChain();
+        }
+
         private IEnumerable<IndexerRequest> GetRequest(string searchType, string parameters)
         {
             if (Settings.Categories.Empty())

src/NzbDrone.Core/Indexers/HDBits/HDBitsRequestGenerator.cs

@@ -34,6 +34,16 @@ public virtual IndexerPageableRequestChain GetSearchRequests(MovieSearchCriteria
             return pageableRequests;
         }
 
+        public IndexerPageableRequestChain GetSearchRequests(BookSearchCriteria searchCriteria)
+        {
+            return new IndexerPageableRequestChain();
+        }
+
+        public IndexerPageableRequestChain GetSearchRequests(AudiobookSearchCriteria searchCriteria)
+        {
+            return new IndexerPageableRequestChain();
+        }
+
         private bool TryAddSearchParameters(TorrentQuery query, SearchCriteriaBase searchCriteria)
         {
             if (searchCriteria.Movie.MovieMetadata.Value.ImdbId.IsNullOrWhiteSpace())

src/NzbDrone.Core/Indexers/IIndexerRequestGenerator.cs

@@ -8,6 +8,8 @@ public interface IIndexerRequestGenerator
     {
         IndexerPageableRequestChain GetRecentRequests();
         IndexerPageableRequestChain GetSearchRequests(MovieSearchCriteria searchCriteria);
+        IndexerPageableRequestChain GetSearchRequests(BookSearchCriteria searchCriteria);
+        IndexerPageableRequestChain GetSearchRequests(AudiobookSearchCriteria searchCriteria);
         Func<IDictionary<string, string>> GetCookies { get; set; }
         Action<IDictionary<string, string>, DateTime?> CookiesUpdater { get; set; }
     }

src/NzbDrone.Core/Indexers/IPTorrents/IPTorrentsRequestGenerator.cs

@@ -23,6 +23,16 @@ public IndexerPageableRequestChain GetSearchRequests(MovieSearchCriteria searchC
             return new IndexerPageableRequestChain();
         }
 
+        public IndexerPageableRequestChain GetSearchRequests(BookSearchCriteria searchCriteria)
+        {
+            return new IndexerPageableRequestChain();
+        }
+
+        public IndexerPageableRequestChain GetSearchRequests(AudiobookSearchCriteria searchCriteria)
+        {
+            return new IndexerPageableRequestChain();
+        }
+
         private IEnumerable<IndexerRequest> GetRssRequests()
         {
             yield return new IndexerRequest(Settings.BaseUrl, HttpAccept.Rss);

src/NzbDrone.Core/Indexers/Newznab/NewznabRequestGenerator.cs

@@ -113,6 +113,66 @@ public IndexerPageableRequestChain GetSearchRequests(MovieSearchCriteria searchC
             return pageableRequests;
         }
 
+        public IndexerPageableRequestChain GetSearchRequests(BookSearchCriteria searchCriteria)
+        {
+            var pageableRequests = new IndexerPageableRequestChain();
+
+            var categories = Settings.Categories.Any()
+                ? Settings.Categories
+                : new[] { NewznabStandardCategory.Books, NewznabStandardCategory.BooksEBook };
+
+            if (!string.IsNullOrWhiteSpace(searchCriteria.ISBN))
+            {
+                pageableRequests.Add(GetPagedRequests(MaxPages, categories, "book", $"&q={Uri.EscapeDataString(searchCriteria.ISBN)}"));
+            }
+            else if (!string.IsNullOrWhiteSpace(searchCriteria.Author) && !string.IsNullOrWhiteSpace(searchCriteria.Title))
+            {
+                var query = $"{searchCriteria.Author} {searchCriteria.Title}";
+                if (searchCriteria.Year.HasValue)
+                {
+                    query += $" {searchCriteria.Year}";
+                }
+
+                pageableRequests.Add(GetPagedRequests(MaxPages, categories, "book", $"&q={Uri.EscapeDataString(query)}"));
+            }
+            else if (!string.IsNullOrWhiteSpace(searchCriteria.Title))
+            {
+                pageableRequests.Add(GetPagedRequests(MaxPages, categories, "book", $"&q={Uri.EscapeDataString(searchCriteria.Title)}"));
+            }
+
+            return pageableRequests;
+        }
+
+        public IndexerPageableRequestChain GetSearchRequests(AudiobookSearchCriteria searchCriteria)
+        {
+            var pageableRequests = new IndexerPageableRequestChain();
+
+            var categories = Settings.Categories.Any()
+                ? Settings.Categories
+                : new[] { NewznabStandardCategory.AudioAudiobook, NewznabStandardCategory.Audio };
+
+            if (!string.IsNullOrWhiteSpace(searchCriteria.ASIN))
+            {
+                pageableRequests.Add(GetPagedRequests(MaxPages, categories, "search", $"&q={Uri.EscapeDataString(searchCriteria.ASIN)}"));
+            }
+            else if (!string.IsNullOrWhiteSpace(searchCriteria.Author) && !string.IsNullOrWhiteSpace(searchCriteria.Title))
+            {
+                var query = $"{searchCriteria.Author} {searchCriteria.Title}";
+                if (!string.IsNullOrWhiteSpace(searchCriteria.Narrator))
+                {
+                    query += $" {searchCriteria.Narrator}";
+                }
+
+                pageableRequests.Add(GetPagedRequests(MaxPages, categories, "search", $"&q={Uri.EscapeDataString(query)}"));
+            }
+            else if (!string.IsNullOrWhiteSpace(searchCriteria.Title))
+            {
+                pageableRequests.Add(GetPagedRequests(MaxPages, categories, "search", $"&q={Uri.EscapeDataString(searchCriteria.Title)}"));
+            }
+
+            return pageableRequests;
+        }
+
         private void AddMovieIdPageableRequests(IndexerPageableRequestChain chain, int maxPages, IEnumerable<int> categories, SearchCriteriaBase searchCriteria)
         {
             var includeTmdbSearch = SupportsTmdbSearch && searchCriteria.Movie.MovieMetadata.Value.TmdbId > 0;

src/NzbDrone.Core/Indexers/Nyaa/NyaaRequestGenerator.cs

@@ -30,6 +30,16 @@ public IndexerPageableRequestChain GetSearchRequests(MovieSearchCriteria searchC
             return pageableRequests;
         }
 
+        public IndexerPageableRequestChain GetSearchRequests(BookSearchCriteria searchCriteria)
+        {
+            return new IndexerPageableRequestChain();
+        }
+
+        public IndexerPageableRequestChain GetSearchRequests(AudiobookSearchCriteria searchCriteria)
+        {
+            return new IndexerPageableRequestChain();
+        }
+
         private IEnumerable<IndexerRequest> GetPagedRequests(string term)
         {
             var baseUrl = $"{Settings.BaseUrl.TrimEnd('/')}/?page=rss{Settings.AdditionalParameters}";

src/NzbDrone.Core/Indexers/PassThePopcorn/PassThePopcornRequestGenerator.cs

@@ -43,6 +43,16 @@ public IndexerPageableRequestChain GetSearchRequests(MovieSearchCriteria searchC
             return pageableRequests;
         }
 
+        public IndexerPageableRequestChain GetSearchRequests(BookSearchCriteria searchCriteria)
+        {
+            return new IndexerPageableRequestChain();
+        }
+
+        public IndexerPageableRequestChain GetSearchRequests(AudiobookSearchCriteria searchCriteria)
+        {
+            return new IndexerPageableRequestChain();
+        }
+
         private IEnumerable<IndexerRequest> GetRequest(string searchParameters)
         {
             var request =

src/NzbDrone.Core/Indexers/RssIndexerRequestGenerator.cs

@@ -28,6 +28,16 @@ public virtual IndexerPageableRequestChain GetSearchRequests(MovieSearchCriteria
             return new IndexerPageableRequestChain();
         }
 
+        public virtual IndexerPageableRequestChain GetSearchRequests(BookSearchCriteria searchCriteria)
+        {
+            return new IndexerPageableRequestChain();
+        }
+
+        public virtual IndexerPageableRequestChain GetSearchRequests(AudiobookSearchCriteria searchCriteria)
+        {
+            return new IndexerPageableRequestChain();
+        }
+
         public Func<IDictionary<string, string>> GetCookies { get; set; }
         public Action<IDictionary<string, string>, DateTime?> CookiesUpdater { get; set; }
     }

src/NzbDrone.Core/Indexers/TorrentPotato/TorrentPotatoRequestGenerator.cs

@@ -74,6 +74,16 @@ public IndexerPageableRequestChain GetSearchRequests(MovieSearchCriteria searchC
             return pageableRequests;
         }
 
+        public IndexerPageableRequestChain GetSearchRequests(BookSearchCriteria searchCriteria)
+        {
+            return new IndexerPageableRequestChain();
+        }
+
+        public IndexerPageableRequestChain GetSearchRequests(AudiobookSearchCriteria searchCriteria)
+        {
+            return new IndexerPageableRequestChain();
+        }
+
         public Func<IDictionary<string, string>> GetCookies { get; set; }
         public Action<IDictionary<string, string>, DateTime?> CookiesUpdater { get; set; }
     }

src/NzbDrone.Core/Indexers/TorrentRss/TorrentRssIndexerRequestGenerator.cs

@@ -24,6 +24,16 @@ public IndexerPageableRequestChain GetSearchRequests(MovieSearchCriteria searchC
             return new IndexerPageableRequestChain();
         }
 
+        public IndexerPageableRequestChain GetSearchRequests(BookSearchCriteria searchCriteria)
+        {
+            return new IndexerPageableRequestChain();
+        }
+
+        public IndexerPageableRequestChain GetSearchRequests(AudiobookSearchCriteria searchCriteria)
+        {
+            return new IndexerPageableRequestChain();
+        }
+
         private IEnumerable<IndexerRequest> GetRssRequests(string searchParameters)
         {
             var request = new IndexerRequest(Settings.BaseUrl.Trim().TrimEnd('/'), HttpAccept.Rss);