Cleanup

DiscordChatExporter.Core/Discord/AuthToken.cs

@@ -2,8 +2,6 @@
 
 namespace DiscordChatExporter.Core.Discord
 {
-    public enum AuthTokenType { User, Bot }
-
     public class AuthToken
     {
         public AuthTokenType Type { get; }

DiscordChatExporter.Core/Discord/AuthTokenType.cs

@@ -0,0 +1,8 @@
+namespace DiscordChatExporter.Core.Discord
+{
+    public enum AuthTokenType
+    {
+        User,
+        Bot
+    }
+}

DiscordChatExporter.Core/Discord/Data/Channel.cs

@@ -7,32 +7,19 @@ using Tyrrrz.Extensions;
 
 namespace DiscordChatExporter.Core.Discord.Data
 {
-    // https://discord.com/developers/docs/resources/channel#channel-object-channel-types
-    // Order of enum fields needs to match the order in the docs.
-    public enum ChannelType
-    {
-        GuildTextChat,
-        DirectTextChat,
-        GuildVoiceChat,
-        DirectGroupTextChat,
-        GuildCategory,
-        GuildNews,
-        GuildStore
-    }
-
     // https://discord.com/developers/docs/resources/channel#channel-object
-    public partial class Channel : IHasId, IHasPosition
+    public partial class Channel : IHasId
     {
         public Snowflake Id { get; }
 
         public ChannelType Type { get; }
 
-        public bool IsTextChannel =>
+        public bool IsTextChannel => Type is
-            Type == ChannelType.GuildTextChat ||
+            ChannelType.GuildTextChat or
-            Type == ChannelType.DirectTextChat ||
+            ChannelType.DirectTextChat or
-            Type == ChannelType.DirectGroupTextChat ||
+            ChannelType.DirectGroupTextChat or
-            Type == ChannelType.GuildNews ||
+            ChannelType.GuildNews or
-            Type == ChannelType.GuildStore;
+            ChannelType.GuildStore;
 
         public Snowflake GuildId { get; }
 
@@ -48,7 +35,7 @@ namespace DiscordChatExporter.Core.Discord.Data
             Snowflake id,
             ChannelType type,
             Snowflake guildId,
-            ChannelCategory? category,
+            ChannelCategory category,
             string name,
             int? position,
             string? topic)
@@ -56,14 +43,13 @@ namespace DiscordChatExporter.Core.Discord.Data
             Id = id;
             Type = type;
             GuildId = guildId;
-            Category = category ?? GetFallbackCategory(type);
+            Category = category;
             Name = name;
             Position = position;
             Topic = topic;
         }
 
         public override string ToString() => Name;
-
     }
 
     public partial class Channel
@@ -79,7 +65,7 @@ namespace DiscordChatExporter.Core.Discord.Data
                 ChannelType.GuildStore => "Store",
                 _ => "Default"
             },
-            0
+            null
         );
 
         public static Channel Parse(JsonElement json, ChannelCategory? category = null, int? position = null)
@@ -87,23 +73,23 @@ namespace DiscordChatExporter.Core.Discord.Data
             var id = json.GetProperty("id").GetString().Pipe(Snowflake.Parse);
             var guildId = json.GetPropertyOrNull("guild_id")?.GetString().Pipe(Snowflake.Parse);
             var topic = json.GetPropertyOrNull("topic")?.GetString();
-
             var type = (ChannelType) json.GetProperty("type").GetInt32();
 
             var name =
+                // Guild channel
                 json.GetPropertyOrNull("name")?.GetString() ??
+                // DM channel
                 json.GetPropertyOrNull("recipients")?.EnumerateArray().Select(User.Parse).Select(u => u.Name).JoinToString(", ") ??
+                // Fallback
                 id.ToString();
 
-            position ??= json.GetPropertyOrNull("position")?.GetInt32();
-
             return new Channel(
                 id,
                 type,
                 guildId ?? Guild.DirectMessages.Id,
                 category ?? GetFallbackCategory(type),
                 name,
-                position,
+                position ?? json.GetPropertyOrNull("position")?.GetInt32(),
                 topic
             );
         }

DiscordChatExporter.Core/Discord/Data/ChannelCategory.cs

@@ -1,13 +1,11 @@
-using System.Linq;
+using System.Text.Json;
-using System.Text.Json;
 using DiscordChatExporter.Core.Discord.Data.Common;
 using DiscordChatExporter.Core.Utils.Extensions;
 using JsonExtensions.Reading;
-using Tyrrrz.Extensions;
 
 namespace DiscordChatExporter.Core.Discord.Data
 {
-    public partial class ChannelCategory : IHasId, IHasPosition
+    public partial class ChannelCategory : IHasId
     {
         public Snowflake Id { get; }
 
@@ -23,7 +21,6 @@ namespace DiscordChatExporter.Core.Discord.Data
         }
 
         public override string ToString() => Name;
-
     }
 
     public partial class ChannelCategory
@@ -31,16 +28,15 @@ namespace DiscordChatExporter.Core.Discord.Data
         public static ChannelCategory Parse(JsonElement json, int? position = null)
         {
             var id = json.GetProperty("id").GetString().Pipe(Snowflake.Parse);
-            position ??= json.GetPropertyOrNull("position")?.GetInt32();
 
-            var name = json.GetPropertyOrNull("name")?.GetString() ??
+            var name =
-                json.GetPropertyOrNull("recipients")?.EnumerateArray().Select(User.Parse).Select(u => u.Name).JoinToString(", ") ??
+                json.GetPropertyOrNull("name")?.GetString() ??
                 id.ToString();
 
             return new ChannelCategory(
                 id,
                 name,
-                position
+                position ?? json.GetPropertyOrNull("position")?.GetInt32()
             );
         }
 

DiscordChatExporter.Core/Discord/Data/ChannelType.cs

@@ -0,0 +1,15 @@
+namespace DiscordChatExporter.Core.Discord.Data
+{
+    // https://discord.com/developers/docs/resources/channel#channel-object-channel-types
+    // Order of enum fields needs to match the order in the docs.
+    public enum ChannelType
+    {
+        GuildTextChat = 0,
+        DirectTextChat,
+        GuildVoiceChat,
+        DirectGroupTextChat,
+        GuildCategory,
+        GuildNews,
+        GuildStore
+    }
+}

DiscordChatExporter.Core/Discord/Data/Common/IHasPosition.cs

@@ -1,7 +0,0 @@
-namespace DiscordChatExporter.Core.Discord.Data.Common
-{
-    public interface IHasPosition
-    {
-        int? Position { get; }
-    }
-}

DiscordChatExporter.Core/Discord/Data/Embed.cs

@@ -63,10 +63,10 @@ namespace DiscordChatExporter.Core.Discord.Data
         public static Embed Parse(JsonElement json)
         {
             var title = json.GetPropertyOrNull("title")?.GetString();
-            var description = json.GetPropertyOrNull("description")?.GetString();
             var url = json.GetPropertyOrNull("url")?.GetString();
             var timestamp = json.GetPropertyOrNull("timestamp")?.GetDateTimeOffset();
             var color = json.GetPropertyOrNull("color")?.GetInt32().Pipe(System.Drawing.Color.FromArgb).ResetAlpha();
+            var description = json.GetPropertyOrNull("description")?.GetString();
 
             var author = json.GetPropertyOrNull("author")?.Pipe(EmbedAuthor.Parse);
             var thumbnail = json.GetPropertyOrNull("thumbnail")?.Pipe(EmbedImage.Parse);

DiscordChatExporter.Core/Discord/Data/Emoji.cs

@@ -18,13 +18,12 @@ namespace DiscordChatExporter.Core.Discord.Data
 
         public string ImageUrl { get; }
 
-        public Emoji(string? id, string name, bool isAnimated)
+        public Emoji(string? id, string name, bool isAnimated, string imageUrl)
         {
             Id = id;
             Name = name;
             IsAnimated = isAnimated;
-
+            ImageUrl = imageUrl;
-            ImageUrl = GetImageUrl(id, name, isAnimated);
         }
 
         public override string ToString() => Name;
@@ -53,12 +52,9 @@ namespace DiscordChatExporter.Core.Discord.Data
             // Custom emoji
             if (!string.IsNullOrWhiteSpace(id))
             {
-                // Animated
+                return isAnimated
-                if (isAnimated)
+                    ? $"https://cdn.discordapp.com/emojis/{id}.gif"
-                    return $"https://cdn.discordapp.com/emojis/{id}.gif";
+                    : $"https://cdn.discordapp.com/emojis/{id}.png";
-
-                // Non-animated
-                return $"https://cdn.discordapp.com/emojis/{id}.png";
             }
 
             // Standard emoji
@@ -73,7 +69,9 @@ namespace DiscordChatExporter.Core.Discord.Data
             var name = json.GetProperty("name").GetString();
             var isAnimated = json.GetPropertyOrNull("animated")?.GetBoolean() ?? false;
 
-            return new Emoji(id, name, isAnimated);
+            var imageUrl = GetImageUrl(id, name, isAnimated);
+
+            return new Emoji(id, name, isAnimated, imageUrl);
         }
     }
 }

DiscordChatExporter.Core/Discord/Data/Member.cs

@@ -19,10 +19,10 @@ namespace DiscordChatExporter.Core.Discord.Data
 
         public IReadOnlyList<Snowflake> RoleIds { get; }
 
-        public Member(User user, string? nick, IReadOnlyList<Snowflake> roleIds)
+        public Member(User user, string nick, IReadOnlyList<Snowflake> roleIds)
         {
             User = user;
-            Nick = nick ?? user.Name;
+            Nick = nick;
             RoleIds = roleIds;
         }
 
@@ -33,7 +33,7 @@ namespace DiscordChatExporter.Core.Discord.Data
     {
         public static Member CreateForUser(User user) => new(
             user,
-            null,
+            user.Name,
             Array.Empty<Snowflake>()
         );
 
@@ -43,12 +43,12 @@ namespace DiscordChatExporter.Core.Discord.Data
             var nick = json.GetPropertyOrNull("nick")?.GetString();
 
             var roleIds =
-                json.GetPropertyOrNull("roles")?.EnumerateArray().Select(j => j.GetString().Pipe(Snowflake.Parse)).ToArray() ??
+                json.GetPropertyOrNull("roles")?.EnumerateArray().Select(j => j.GetString()).Select(Snowflake.Parse).ToArray() ??
                 Array.Empty<Snowflake>();
 
             return new Member(
                 user,
-                nick,
+                nick ?? user.Name,
                 roleIds
             );
         }

DiscordChatExporter.Core/Discord/Data/Message.cs

@@ -100,7 +100,7 @@ namespace DiscordChatExporter.Core.Discord.Data
             var type = (MessageType) json.GetProperty("type").GetInt32();
             var isPinned = json.GetPropertyOrNull("pinned")?.GetBoolean() ?? false;
             var messageReference = json.GetPropertyOrNull("message_reference")?.Pipe(MessageReference.Parse);
-            var referencedMessage = json.GetPropertyOrNull("referenced_message")?.Pipe(Message.Parse);
+            var referencedMessage = json.GetPropertyOrNull("referenced_message")?.Pipe(Parse);
 
             var content = type switch
             {

DiscordChatExporter.Core/Discord/Data/Reaction.cs

@@ -23,8 +23,8 @@ namespace DiscordChatExporter.Core.Discord.Data
     {
         public static Reaction Parse(JsonElement json)
         {
-            var count = json.GetProperty("count").GetInt32();
             var emoji = json.GetProperty("emoji").Pipe(Emoji.Parse);
+            var count = json.GetProperty("count").GetInt32();
 
             return new Reaction(emoji, count);
         }

DiscordChatExporter.Core/Discord/Data/Role.cs

@@ -40,7 +40,8 @@ namespace DiscordChatExporter.Core.Discord.Data
             var name = json.GetProperty("name").GetString();
             var position = json.GetProperty("position").GetInt32();
 
-            var color = json.GetPropertyOrNull("color")?
+            var color = json
+                .GetPropertyOrNull("color")?
                 .GetInt32()
                 .Pipe(System.Drawing.Color.FromArgb)
                 .ResetAlpha()

DiscordChatExporter.Core/Discord/Data/User.cs

@@ -58,10 +58,10 @@ namespace DiscordChatExporter.Core.Discord.Data
         public static User Parse(JsonElement json)
         {
             var id = json.GetProperty("id").GetString().Pipe(Snowflake.Parse);
+            var isBot = json.GetPropertyOrNull("bot")?.GetBoolean() ?? false;
             var discriminator = json.GetProperty("discriminator").GetString().Pipe(int.Parse);
             var name = json.GetProperty("username").GetString();
             var avatarHash = json.GetProperty("avatar").GetString();
-            var isBot = json.GetPropertyOrNull("bot")?.GetBoolean() ?? false;
 
             var avatarUrl = !string.IsNullOrWhiteSpace(avatarHash)
                 ? GetAvatarUrl(id, avatarHash)

DiscordChatExporter.Core/Discord/DiscordClient.cs

@@ -11,7 +11,6 @@ using DiscordChatExporter.Core.Utils;
 using DiscordChatExporter.Core.Utils.Extensions;
 using JsonExtensions.Http;
 using JsonExtensions.Reading;
-using Tyrrrz.Extensions;
 
 namespace DiscordChatExporter.Core.Discord
 {
@@ -29,7 +28,9 @@ namespace DiscordChatExporter.Core.Discord
         }
 
         public DiscordClient(AuthToken token)
-            : this(Http.Client, token) {}
+            : this(Http.Client, token)
+        {
+        }
 
         private async ValueTask<HttpResponseMessage> GetResponseAsync(string url) =>
             await Http.ResponsePolicy.ExecuteAsync(async () =>
@@ -64,7 +65,7 @@ namespace DiscordChatExporter.Core.Discord
 
             return response.IsSuccessStatusCode
                 ? await response.Content.ReadAsJsonAsync()
-                : (JsonElement?) null;
+                : null;
         }
 
         public async IAsyncEnumerable<Guild> GetUserGuildsAsync()
@@ -118,29 +119,30 @@ namespace DiscordChatExporter.Core.Discord
             {
                 var response = await GetJsonResponseAsync($"guilds/{guildId}/channels");
 
-                var orderedResponse = response
+                var responseOrdered = response
                     .EnumerateArray()
                     .OrderBy(j => j.GetProperty("position").GetInt32())
-                    .ThenBy(j => ulong.Parse(j.GetProperty("id").GetString()))
+                    .ThenBy(j => Snowflake.Parse(j.GetProperty("id").GetString()))
                     .ToArray();
 
-                var categories = orderedResponse
+                var categories = responseOrdered
                     .Where(j => j.GetProperty("type").GetInt32() == (int) ChannelType.GuildCategory)
                     .Select((j, index) => ChannelCategory.Parse(j, index + 1))
-                    .ToDictionary(j => j.Id.ToString());
+                    .ToDictionary(j => j.Id.ToString(), StringComparer.Ordinal);
 
                 var position = 0;
 
-                foreach (var channelJson in orderedResponse)
+                foreach (var channelJson in responseOrdered)
                 {
                     var parentId = channelJson.GetPropertyOrNull("parent_id")?.GetString();
+
                     var category = !string.IsNullOrWhiteSpace(parentId)
                         ? categories.GetValueOrDefault(parentId)
                         : null;
 
                     var channel = Channel.Parse(channelJson, category, position);
 
-                    // Skip non-text channels
+                    // We are only interested in text channels
                     if (!channel.IsTextChannel)
                         continue;
 
@@ -178,15 +180,12 @@ namespace DiscordChatExporter.Core.Discord
                 var response = await GetJsonResponseAsync($"channels/{channelId}");
                 return ChannelCategory.Parse(response);
             }
-            /***
+            // In some cases, the Discord API returns an empty body when requesting channel category.
-             * In some cases, the Discord API returns an empty body when requesting some channel category info.
+            // Instead, we use an empty channel category as a fallback.
-             * Instead, we use an empty channel category as a fallback.
-             */
             catch (DiscordChatExporterException)
             {
                 return ChannelCategory.Empty;
             }
-
         }
 
         public async ValueTask<Channel> GetChannelAsync(Snowflake channelId)
@@ -221,7 +220,7 @@ namespace DiscordChatExporter.Core.Discord
             IProgress<double>? progress = null)
         {
             // Get the last message in the specified range.
-            // This snapshots the boundaries, which means that messages posted after the exported started
+            // This snapshots the boundaries, which means that messages posted after the export started
             // will not appear in the output.
             // Additionally, it provides the date of the last message, which is used to calculate progress.
             var lastMessage = await TryGetLastMessageAsync(channelId, before);
@@ -271,7 +270,7 @@ namespace DiscordChatExporter.Core.Discord
                             progress.Report(exportedDuration / totalDuration);
                         }
                         // Avoid division by zero if all messages have the exact same timestamp
-                        // (which can happen easily if there's only one message in the channel)
+                        // (which may be the case if there's only one message in the channel)
                         else
                         {
                             progress.Report(1);

DiscordChatExporter.Core/Discord/Snowflake.cs

@@ -10,8 +10,9 @@ namespace DiscordChatExporter.Core.Discord
 
         public Snowflake(ulong value) => Value = value;
 
-        public DateTimeOffset ToDate() =>
+        public DateTimeOffset ToDate() => DateTimeOffset.FromUnixTimeMilliseconds(
-            DateTimeOffset.FromUnixTimeMilliseconds((long) ((Value >> 22) + 1420070400000UL)).ToLocalTime();
+            (long) ((Value >> 22) + 1420070400000UL)
+        ).ToLocalTime();
 
         public override string ToString() => Value.ToString(CultureInfo.InvariantCulture);
     }
@@ -53,9 +54,11 @@ namespace DiscordChatExporter.Core.Discord
         public static Snowflake Parse(string str) => Parse(str, null);
     }
 
-    public partial struct Snowflake : IEquatable<Snowflake>
+    public partial struct Snowflake : IComparable<Snowflake>, IEquatable<Snowflake>
     {
-        public bool Equals(Snowflake other) => Value == other.Value;
+        public int CompareTo(Snowflake other) => Value.CompareTo(other.Value);
+
+        public bool Equals(Snowflake other) => CompareTo(other) == 0;
 
         public override bool Equals(object? obj) => obj is Snowflake other && Equals(other);
 

DiscordChatExporter.Core/Exporting/ExportContext.cs

@@ -79,7 +79,7 @@ namespace DiscordChatExporter.Core.Exporting
                     : filePath;
 
                 // HACK: for HTML, we need to format the URL properly
-                if (Request.Format == ExportFormat.HtmlDark || Request.Format == ExportFormat.HtmlLight)
+                if (Request.Format is ExportFormat.HtmlDark or ExportFormat.HtmlLight)
                 {
                     // Need to escape each path segment while keeping the directory separators intact
                     return relativeFilePath
@@ -93,7 +93,7 @@ namespace DiscordChatExporter.Core.Exporting
             // Try to catch only exceptions related to failed HTTP requests
             // https://github.com/Tyrrrz/DiscordChatExporter/issues/332
             // https://github.com/Tyrrrz/DiscordChatExporter/issues/372
-            catch (Exception ex) when (ex is HttpRequestException || ex is OperationCanceledException)
+            catch (Exception ex) when (ex is HttpRequestException or OperationCanceledException)
             {
                 // TODO: add logging so we can be more liberal with catching exceptions
                 // We don't want this to crash the exporting process in case of failure

DiscordChatExporter.Core/Exporting/Writers/Html/MessageGroup.cs

@@ -36,9 +36,13 @@ namespace DiscordChatExporter.Core.Exporting.Writers.Html
     internal partial class MessageGroup
     {
         public static bool CanJoin(Message message1, Message message2) =>
+            // Must be from the same author
             message1.Author.Id == message2.Author.Id &&
+            // Author's name must not have changed between messages
             string.Equals(message1.Author.FullName, message2.Author.FullName, StringComparison.Ordinal) &&
+            // Duration between messages must be 7 minutes or less
             (message2.Timestamp - message1.Timestamp).Duration().TotalMinutes <= 7 &&
+            // Other message must not be a reply
             message2.Reference is null;
 
         public static MessageGroup Join(IReadOnlyList<Message> messages)

DiscordChatExporter.Core/Exporting/Writers/JsonMessageWriter.cs

@@ -20,6 +20,8 @@ namespace DiscordChatExporter.Core.Exporting.Writers
             {
                 Encoder = JavaScriptEncoder.UnsafeRelaxedJsonEscaping,
                 Indented = true,
+                // Validation errors may mask actual failures
+                // https://github.com/Tyrrrz/DiscordChatExporter/issues/413
                 SkipValidation = true
             });
         }

DiscordChatExporter.Core/Utils/Extensions/GenericExtensions.cs

@@ -9,6 +9,6 @@ namespace DiscordChatExporter.Core.Utils.Extensions
         public static T? NullIf<T>(this T value, Func<T, bool> predicate) where T : struct =>
             !predicate(value)
                 ? value
-                : (T?) null;
+                : null;
     }
 }

DiscordChatExporter.Core/Utils/Extensions/StringExtensions.cs

@@ -4,9 +4,14 @@ namespace DiscordChatExporter.Core.Utils.Extensions
 {
     public static class StringExtensions
     {
+        public static string? NullIfWhiteSpace(this string str) =>
+            !string.IsNullOrWhiteSpace(str)
+                ? str
+                : null;
+
         public static string Truncate(this string str, int charCount) =>
             str.Length > charCount
-                ? str.Substring(0, charCount)
+                ? str[..charCount]
                 : str;
 
         public static StringBuilder AppendIfNotEmpty(this StringBuilder builder, char value) =>

DiscordChatExporter.Core/Utils/Http.cs

@@ -5,6 +5,7 @@ using System.Net;
 using System.Net.Http;
 using System.Text.RegularExpressions;
 using System.Threading.Tasks;
+using DiscordChatExporter.Core.Utils.Extensions;
 using Polly;
 
 namespace DiscordChatExporter.Core.Utils
@@ -41,21 +42,24 @@ namespace DiscordChatExporter.Core.Utils
                     },
                     (_, _, _, _) => Task.CompletedTask);
 
-        private static HttpStatusCode? TryGetStatusCodeFromException(HttpRequestException ex)
+        private static HttpStatusCode? TryGetStatusCodeFromException(HttpRequestException ex) =>
-        {
             // This is extremely frail, but there's no other way
-            var statusCodeRaw = Regex.Match(ex.Message, @": (\d+) \(").Groups[1].Value;
+            Regex
-            return !string.IsNullOrWhiteSpace(statusCodeRaw)
+                .Match(ex.Message, @": (\d+) \(")
-                ? (HttpStatusCode) int.Parse(statusCodeRaw, CultureInfo.InvariantCulture)
+                .Groups[1]
-                : (HttpStatusCode?) null;
+                .Value
-        }
+                .NullIfWhiteSpace()?
+                .Pipe(s => (HttpStatusCode) int.Parse(s, CultureInfo.InvariantCulture));
 
         public static IAsyncPolicy ExceptionPolicy { get; } =
             Policy
                 .Handle<IOException>() // dangerous
-                .Or<HttpRequestException>(ex => TryGetStatusCodeFromException(ex) == HttpStatusCode.TooManyRequests)
+                .Or<HttpRequestException>(ex =>
-                .Or<HttpRequestException>(ex => TryGetStatusCodeFromException(ex) == HttpStatusCode.RequestTimeout)
+                    TryGetStatusCodeFromException(ex) is
-                .Or<HttpRequestException>(ex => TryGetStatusCodeFromException(ex) >= HttpStatusCode.InternalServerError)
+                        HttpStatusCode.TooManyRequests or
+                        HttpStatusCode.RequestTimeout or
+                        HttpStatusCode.InternalServerError
+                )
                 .WaitAndRetryAsync(4, i => TimeSpan.FromSeconds(Math.Pow(2, i) + 1));
     }
 }