feat(server): lossy avatar thumbnails, gzip upload and separate avatar endpoints
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justme committed
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16 files changed
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@@ -165,6 +165,10 @@ public sealed class AccountProfileRequest
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{
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[JsonPropertyName("displayName")] public required string DisplayName { get; init; }
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[JsonPropertyName("avatar")] public string? Avatar { get; init; }
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/// <summary>头像的有损小图(data URL)。列表、聊天默认只分发它,原图在预览时才下载</summary>
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[JsonPropertyName("avatarThumb")] public string? AvatarThumb { get; init; }
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/// <summary>只改名字、不动头像:保留服务端现有的头像(不带 avatar 的请求默认表示移除头像)</summary>
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[JsonPropertyName("keepAvatar")] public bool KeepAvatar { get; init; }
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}
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public sealed class WorkspaceNameRequest { [JsonPropertyName("name")] public required string Name { get; init; } }
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public sealed class WorkspaceChannelRequest
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@@ -11,17 +11,25 @@ public static partial class Endpoints
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api.MapGet("/accounts/profile", (HttpContext ctx) =>
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{
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if (!TryAccount(ctx, accounts, out var username)) throw new WebDropException(ErrorCode.AccountRequired);
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return Json(accounts.Profile(username), ApiJson.Default.AccountProfile);
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return Json(accounts.Profile(username).WithoutAvatar(), ApiJson.Default.AccountProfile);
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});
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// 头像单独取:默认给有损的缩略图(列表、聊天用),size=full 才是原图(预览时)。带 ETag,没变化时只回 304。需要登录账号
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api.MapGet("/accounts/users/{username}/avatar", (string username, HttpContext ctx) =>
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{
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if (!TryAccount(ctx, accounts, out _)) throw new WebDropException(ErrorCode.AccountRequired);
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var profile = accounts.Profile(NormalizeUsername(username));
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var full = ctx.Request.Query["size"] == "full";
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return AvatarResult(ctx, full ? profile.Avatar : profile.AvatarThumb ?? profile.Avatar, $"{profile.ModifiedAt}-{(full ? "f" : "t")}");
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});
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api.MapPatch("/accounts/profile", async (HttpContext ctx, ChannelService svc, CancellationToken ct) =>
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{
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if (!TryAccount(ctx, accounts, out var username)) throw new WebDropException(ErrorCode.AccountRequired);
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// 动图头像比其他请求大得多,单独放宽(全局上限 2 MB)
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if (ctx.Features.Get<IHttpMaxRequestBodySizeFeature>() is { IsReadOnly: false } size) size.MaxRequestBodySize = 8 * 1024 * 1024;
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var req = await ReadJson(ctx.Request, ApiJson.Default.AccountProfileRequest, ct);
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var profile = accounts.UpdateProfile(username, req.DisplayName, req.Avatar);
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var req = await ReadJsonCompressed(ctx.Request, ApiJson.Default.AccountProfileRequest, 12 * 1024 * 1024, ct);
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var profile = accounts.UpdateProfile(username, req.DisplayName, req.Avatar, req.AvatarThumb, req.KeepAvatar);
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svc.AccountProfileChanged(username);
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return Json(profile, ApiJson.Default.AccountProfile);
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return Json(profile.WithoutAvatar(), ApiJson.Default.AccountProfile);
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});
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api.MapPost("/accounts", async (HttpContext ctx, CancellationToken ct) =>
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{
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@@ -13,7 +13,7 @@ public static partial class Endpoints
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Structure = state,
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People = state.Locations.Select(l => l.AuthorAccount).Where(u => u is not null).Select(u => u!)
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.Concat(service.MemberAccounts(space)).Distinct(StringComparer.OrdinalIgnoreCase)
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.Select(u => accounts.Profile(u)).ToList(),
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.Select(u => accounts.Profile(u).WithoutAvatar()).ToList(),
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};
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api.MapGet("/spaces/{id}/structure", (string id, HttpContext ctx, ChannelService svc) =>
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Json(View(svc, ParseId(id), svc.GetWorkspace(ParseId(id), RequestAuth.FromHeaders(ctx.Request, false))), ApiJson.Default.WorkspaceBody));
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@@ -1,5 +1,6 @@
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using System.Buffers;
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using System.Diagnostics;
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using System.IO.Compression;
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using System.Net.WebSockets;
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using System.Security.Cryptography;
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using System.Text.Json;
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@@ -75,11 +76,18 @@ public static partial class Endpoints
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{
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// 空间头像(动图)比其他设置大得多,单独放宽请求体上限
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if (ctx.Features.Get<Microsoft.AspNetCore.Http.Features.IHttpMaxRequestBodySizeFeature>() is { IsReadOnly: false } size) size.MaxRequestBodySize = 4 * 1024 * 1024;
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var patch = await ReadJson(ctx.Request, ApiJson.Default.ChannelSettingsPatch, ct);
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var patch = await ReadJsonCompressed(ctx.Request, ApiJson.Default.ChannelSettingsPatch, 6 * 1024 * 1024, ct);
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var info = svc.UpdateSettings(ParseId(id), RequestAuth.FromHeaders(ctx.Request, requireEndpoint: false), patch);
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return Json(info, ApiJson.Default.ChannelInfo);
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});
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// 空间头像原图(信息里只带缩略图):预览时才下载。带 ETag(内容哈希),没变时回 304
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api.MapGet("/channels/{id}/avatar", (string id, HttpContext ctx, ChannelService svc) =>
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{
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var data = svc.GetChannelAvatarFull(ParseId(id), RequestAuth.FromHeaders(ctx.Request, requireEndpoint: false));
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return AvatarResult(ctx, data, Convert.ToHexString(SHA256.HashData(System.Text.Encoding.UTF8.GetBytes(data ?? ""))));
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});
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api.MapDelete("/channels/{id}", (string id, HttpContext ctx, ChannelService svc) =>
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{
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svc.DeleteChannel(ParseId(id), RequestAuth.FromHeaders(ctx.Request, requireEndpoint: false));
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@@ -454,6 +462,41 @@ public static partial class Endpoints
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return long.TryParse(header, out long n) && n >= 0 ? n : throw new WebDropException(ErrorCode.BadRequest);
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}
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/// <summary>
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/// 读 JSON 请求体,支持 Content-Encoding: gzip(头像这类带 base64 的大请求,压缩后能省下 base64 多出来的约四分之一)。
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/// 解压后的大小另外限制,防止小体积的压缩炸弹。
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/// </summary>
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private static async Task<T> ReadJsonCompressed<T>(HttpRequest req, JsonTypeInfo<T> info, int maxBytes, CancellationToken ct) where T : class
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{
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try
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{
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Stream body = req.Body;
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if (string.Equals(req.Headers.ContentEncoding.ToString(), "gzip", StringComparison.OrdinalIgnoreCase)) body = new GZipStream(req.Body, CompressionMode.Decompress);
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using var plain = new MemoryStream();
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var buffer = new byte[81920]; int read;
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while ((read = await body.ReadAsync(buffer, ct)) > 0)
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{
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if (plain.Length + read > maxBytes) throw new WebDropException(ErrorCode.BadRequest);
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plain.Write(buffer, 0, read);
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}
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plain.Position = 0;
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return await JsonSerializer.DeserializeAsync(plain, info, ct) ?? throw new WebDropException(ErrorCode.BadRequest);
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}
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catch (Exception error) when (error is JsonException or InvalidDataException) { throw new WebDropException(ErrorCode.BadRequest); }
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}
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/// <summary>data URL 头像 → 图片字节(带 ETag,没变时 304)</summary>
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private static IResult AvatarResult(HttpContext ctx, string? data, string version)
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{
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if (data is null) return Results.NotFound();
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var etag = $"\"{version}\"";
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ctx.Response.Headers.ETag = etag;
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ctx.Response.Headers.CacheControl = "private, no-cache";
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if (ctx.Request.Headers.IfNoneMatch == etag) return Results.StatusCode(StatusCodes.Status304NotModified);
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var mime = data[5..data.IndexOf(';')];
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return Results.Bytes(Convert.FromBase64String(data[(data.IndexOf(',') + 1)..]), mime);
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}
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private static async Task<T> ReadJson<T>(HttpRequest req, JsonTypeInfo<T> info, CancellationToken ct) where T : class
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{
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try
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@@ -119,8 +119,9 @@ public interface IResourceTx
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long NextSeq(Id16 id);
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void DeleteChannelRows(Id16 id);
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/// <summary>空间头像(data URL)单独存放,不放进每次请求都要读的设置 JSON</summary>
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string? GetChannelAvatar(Id16 id);
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void SetChannelAvatar(Id16 id, string? avatar);
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/// <summary>thumb 为 true 取缩略图(没有就用原图),否则取原图</summary>
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string? GetChannelAvatar(Id16 id, bool thumb);
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void SetChannelAvatar(Id16 id, string? avatar, string? thumb);
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IReadOnlyList<Id16> ListExpiredChannels(long now, int limit);
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// 成员
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@@ -6,6 +6,13 @@ public sealed class AccountProfile
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{
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[JsonPropertyName("username")] public required string Username { get; init; }
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[JsonPropertyName("displayName")] public required string DisplayName { get; init; }
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/// <summary>头像(data URL)。资料列表、空间成员等接口不再内联头像(动图可能有几 MB),只告诉有没有,头像另用 /accounts/users/{用户名}/avatar 取</summary>
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[JsonPropertyName("avatar")] public string? Avatar { get; init; }
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[JsonPropertyName("hasAvatar")] public bool HasAvatar { get; init; }
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[JsonPropertyName("modifiedAt")] public required long ModifiedAt { get; init; }
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/// <summary>有损的小图(列表、聊天里默认分发);没有单独上传时用原图。不随 JSON 输出</summary>
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[JsonIgnore] public string? AvatarThumb { get; init; }
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public AccountProfile WithoutAvatar() => new() { Username = Username, DisplayName = DisplayName, HasAvatar = HasAvatar, ModifiedAt = ModifiedAt };
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}
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@@ -10,14 +10,20 @@ public static class AvatarData
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/// <summary>空间头像会跟着空间信息发给所有成员和空间列表,动图上限比账号头像小,约 1.5 MB</summary>
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public const int MaxSpaceGifChars = 2_000_000;
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/// <summary>缩略图(列表、聊天里默认分发的有损小图)的上限:静态约 75 KB,动图约 370 KB</summary>
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public const int MaxThumbStaticChars = 100_000;
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public const int MaxThumbGifChars = 500_000;
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private static readonly string[] Prefixes = ["data:image/png;base64,", "data:image/jpeg;base64,", "data:image/webp;base64,", "data:image/gif;base64,"];
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public static void ValidateThumb(string thumb) => Validate(thumb, MaxThumbGifChars, MaxThumbStaticChars);
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/// <summary>不合法时抛 BadRequest</summary>
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public static void Validate(string avatar, int maxGifChars)
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public static void Validate(string avatar, int maxGifChars, int maxStaticChars = MaxStaticChars)
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{
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var prefix = Prefixes.FirstOrDefault(p => avatar.StartsWith(p, StringComparison.Ordinal));
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var gif = prefix?.Contains("gif", StringComparison.Ordinal) == true;
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if (prefix is null || avatar.Length > (gif ? maxGifChars : MaxStaticChars) || avatar.Length <= prefix.Length) throw new WebDropException(ErrorCode.BadRequest);
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if (prefix is null || avatar.Length > (gif ? maxGifChars : maxStaticChars) || avatar.Length <= prefix.Length) throw new WebDropException(ErrorCode.BadRequest);
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byte[] bytes;
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try { bytes = Convert.FromBase64String(avatar[prefix.Length..]); }
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catch (FormatException) { throw new WebDropException(ErrorCode.BadRequest); }
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@@ -68,7 +68,14 @@ public sealed partial class ChannelService(
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public ChannelInfo GetChannel(Id16 id, Credentials creds) => store.Read(tx =>
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{
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var (channel, principal) = Authenticate(tx, id, creds, Membership.None);
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return ToInfo(channel, tx.CountMembers(id), principal, tx.GetChannelAvatar(id));
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return ToInfo(channel, tx.CountMembers(id), principal, tx.GetChannelAvatar(id, thumb: true));
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});
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/// <summary>空间头像原图(预览时才下载)。需要能读这个空间</summary>
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public string? GetChannelAvatarFull(Id16 id, Credentials creds) => store.Read(tx =>
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{
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_ = Authenticate(tx, id, creds, Membership.None);
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return tx.GetChannelAvatar(id, thumb: false);
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});
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public ChannelInfo UpdateSettings(Id16 id, Credentials creds, ChannelSettingsPatch patch)
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@@ -81,7 +88,8 @@ public sealed partial class ChannelService(
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var updated = patch.ApplyTo(channel.Settings);
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updated.Validate(limits);
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if (patch.Avatar is { Length: > 0 } newAvatar) AvatarData.Validate(newAvatar, AvatarData.MaxSpaceGifChars);
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if (patch.Avatar is not null) tx.SetChannelAvatar(id, patch.Avatar.Length == 0 ? null : patch.Avatar);
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if (patch.AvatarThumb is { Length: > 0 } newThumb) { if (patch.Avatar is not { Length: > 0 }) throw new WebDropException(ErrorCode.BadRequest); AvatarData.ValidateThumb(newThumb); }
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if (patch.Avatar is not null) tx.SetChannelAvatar(id, patch.Avatar.Length == 0 ? null : patch.Avatar, patch.Avatar.Length == 0 ? null : patch.AvatarThumb is { Length: > 0 } ? patch.AvatarThumb : null);
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long expiresAt = updated.TtlSeconds != channel.Settings.TtlSeconds
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? clock.NowMs + updated.TtlSeconds * 1000L
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@@ -93,7 +101,7 @@ public sealed partial class ChannelService(
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tx.SetJoinPassword(id, hash, salt);
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channel = channel with { JoinPasswordHash = hash, JoinPasswordSalt = salt };
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}
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return ToInfo(channel with { Settings = updated, ExpiresAt = expiresAt }, tx.CountMembers(id), avatar: tx.GetChannelAvatar(id));
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return ToInfo(channel with { Settings = updated, ExpiresAt = expiresAt }, tx.CountMembers(id), avatar: tx.GetChannelAvatar(id, thumb: true));
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});
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events.SettingsChanged(id);
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return info;
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@@ -10,7 +10,7 @@ public sealed partial class ChannelService
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{
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var channel = tx.GetChannel(id)!;
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var role = tx.GetChannelMember(id, username)?.Role == "owner" ? Role.Owner : channel.WriteHash is not null ? Role.Write : Role.Read;
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return ToInfo(channel, tx.CountMembers(id), new Principal(role, username), tx.GetChannelAvatar(id));
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return ToInfo(channel, tx.CountMembers(id), new Principal(role, username), tx.GetChannelAvatar(id, thumb: true));
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}).ToList());
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private static WorkspaceState NewWorkspace(string username, long now)
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{
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@@ -66,6 +66,8 @@ public sealed class ChannelSettingsPatch
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[JsonPropertyName("ui_restrict_copy_download")] public bool? UiRestrictCopyDownload { get; init; }
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/// <summary>空间头像 data URL;不传表示不改,空字符串表示移除。只有空间主能改。</summary>
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[JsonPropertyName("avatar")] public string? Avatar { get; init; }
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/// <summary>空间头像的有损小图(data URL):空间列表、标题默认只分发它,原图在预览时才下载</summary>
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[JsonPropertyName("avatar_thumb")] public string? AvatarThumb { get; init; }
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public ChannelSettings ApplyTo(ChannelSettings s) => new()
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{
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@@ -9,24 +9,27 @@ public sealed partial class SqliteAccountStore
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lock (_gate)
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{
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using var cmd = _connection.CreateCommand();
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cmd.CommandText = "SELECT display_name,avatar,modified_at FROM account_profiles WHERE username=$u";
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cmd.CommandText = "SELECT display_name,avatar,modified_at,avatar_thumb FROM account_profiles WHERE username=$u";
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cmd.Parameters.AddWithValue("$u", username);
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using var reader = cmd.ExecuteReader();
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return reader.Read() ? new AccountProfile { Username = username, DisplayName = reader.GetString(0), Avatar = reader.IsDBNull(1) ? null : reader.GetString(1), ModifiedAt = reader.GetInt64(2) }
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return reader.Read() ? new AccountProfile { Username = username, DisplayName = reader.GetString(0), Avatar = reader.IsDBNull(1) ? null : reader.GetString(1), HasAvatar = !reader.IsDBNull(1), ModifiedAt = reader.GetInt64(2), AvatarThumb = reader.IsDBNull(3) ? null : reader.GetString(3) }
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: new AccountProfile { Username = username, DisplayName = username, ModifiedAt = 0 };
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}
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}
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public AccountProfile UpdateProfile(string username, string displayName, string? avatar)
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public AccountProfile UpdateProfile(string username, string displayName, string? avatar, string? avatarThumb = null, bool keepAvatar = false)
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{
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if (displayName is null || displayName.Trim().Length > 48 || displayName.Any(char.IsControl)) throw new WebDropException(ErrorCode.BadRequest);
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if (avatar is not null) AvatarData.Validate(avatar, AvatarData.MaxAccountGifChars);
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if (keepAvatar) { var current = Profile(username); avatar = current.Avatar; avatarThumb = current.AvatarThumb; }
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else if (avatar is not null) AvatarData.Validate(avatar, AvatarData.MaxAccountGifChars);
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if (!keepAvatar && avatarThumb is not null) { if (avatar is null) throw new WebDropException(ErrorCode.BadRequest); AvatarData.ValidateThumb(avatarThumb); }
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lock (_gate)
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{
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using var cmd = _connection.CreateCommand();
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cmd.CommandText = "INSERT INTO account_profiles(username,display_name,avatar,modified_at) VALUES($u,$n,$a,$t) ON CONFLICT(username) DO UPDATE SET display_name=excluded.display_name,avatar=excluded.avatar,modified_at=MAX(account_profiles.modified_at+1,excluded.modified_at)";
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cmd.CommandText = "INSERT INTO account_profiles(username,display_name,avatar,avatar_thumb,modified_at) VALUES($u,$n,$a,$b,$t) ON CONFLICT(username) DO UPDATE SET display_name=excluded.display_name,avatar=excluded.avatar,avatar_thumb=excluded.avatar_thumb,modified_at=MAX(account_profiles.modified_at+1,excluded.modified_at)";
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cmd.Parameters.AddWithValue("$u", username);
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cmd.Parameters.AddWithValue("$n", displayName.Trim());
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cmd.Parameters.AddWithValue("$a", (object?)avatar ?? DBNull.Value);
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cmd.Parameters.AddWithValue("$b", (object?)avatarThumb ?? DBNull.Value);
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cmd.Parameters.AddWithValue("$t", DateTimeOffset.UtcNow.ToUnixTimeMilliseconds());
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cmd.ExecuteNonQuery();
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return Profile(username);
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@@ -27,6 +27,19 @@ public sealed partial class SqliteAccountStore : IDisposable
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cmd.ExecuteNonQuery();
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using (var columns = _connection.CreateCommand())
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{
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columns.CommandText = "PRAGMA table_info(account_profiles)";
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using (var profileColumns = columns.ExecuteReader())
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{
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bool hasThumb = false;
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while (profileColumns.Read()) if (profileColumns.GetString(1) == "avatar_thumb") hasThumb = true;
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profileColumns.Close();
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if (!hasThumb)
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{
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using var alterProfiles = _connection.CreateCommand();
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alterProfiles.CommandText = "ALTER TABLE account_profiles ADD COLUMN avatar_thumb TEXT";
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alterProfiles.ExecuteNonQuery();
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}
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}
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columns.CommandText = "PRAGMA table_info(accounts)";
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using var reader = columns.ExecuteReader();
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bool hasSigningKey = false;
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@@ -37,6 +37,7 @@ public sealed class SqliteChannelStore : IResourceStore, IDisposable
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Exec(_writeConn, "DELETE FROM channel_join_denials WHERE target LIKE 'endpoint:%';");
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// v7: 设置里的成员人数上限由 seats 改名为 max_members,迁移已有频道的设置 JSON(幂等)
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Exec(_writeConn, "UPDATE channels SET settings = json_remove(json_set(settings, '$.max_members', json_extract(settings, '$.seats')), '$.seats') WHERE json_extract(settings, '$.seats') IS NOT NULL AND json_extract(settings, '$.max_members') IS NULL;");
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try { Exec(_writeConn, "ALTER TABLE channel_avatars ADD COLUMN thumb TEXT;"); } catch (SqliteException) { /* 新建的表或已经迁移过 */ }
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// Additive table: retain the running v2 database and its existing channel data.
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Exec(_writeConn, """
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CREATE TABLE IF NOT EXISTS channel_key_packages (
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@@ -46,7 +47,7 @@ public sealed class SqliteChannelStore : IResourceStore, IDisposable
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CREATE INDEX IF NOT EXISTS ix_channel_keys_username ON channel_key_packages(username);
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CREATE TABLE IF NOT EXISTS workspace_structures (space_id BLOB PRIMARY KEY, state TEXT NOT NULL) WITHOUT ROWID;
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CREATE TABLE IF NOT EXISTS workspace_crypto (space_id BLOB PRIMARY KEY, state TEXT NOT NULL) WITHOUT ROWID;
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CREATE TABLE IF NOT EXISTS channel_avatars (space_id BLOB PRIMARY KEY, avatar TEXT NOT NULL) WITHOUT ROWID;
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CREATE TABLE IF NOT EXISTS channel_avatars (space_id BLOB PRIMARY KEY, avatar TEXT NOT NULL, thumb TEXT) WITHOUT ROWID;
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""");
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}
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|
||||
@@ -508,12 +509,13 @@ public sealed class SqliteChannelStore : IResourceStore, IDisposable
|
||||
Run("DELETE FROM channel_join_denials WHERE channel_id=@c", ("@c", key));
|
||||
}
|
||||
|
||||
public string? GetChannelAvatar(Id16 id) => Scalar("SELECT avatar FROM channel_avatars WHERE space_id=@c", ("@c", id.ToArray())) as string;
|
||||
public string? GetChannelAvatar(Id16 id, bool thumb) =>
|
||||
Scalar(thumb ? "SELECT COALESCE(thumb, avatar) FROM channel_avatars WHERE space_id=@c" : "SELECT avatar FROM channel_avatars WHERE space_id=@c", ("@c", id.ToArray())) as string;
|
||||
|
||||
public void SetChannelAvatar(Id16 id, string? avatar)
|
||||
public void SetChannelAvatar(Id16 id, string? avatar, string? thumb)
|
||||
{
|
||||
if (avatar is null) Run("DELETE FROM channel_avatars WHERE space_id=@c", ("@c", id.ToArray()));
|
||||
else Run("INSERT INTO channel_avatars (space_id, avatar) VALUES (@c,@a) ON CONFLICT(space_id) DO UPDATE SET avatar=excluded.avatar", ("@c", id.ToArray()), ("@a", avatar));
|
||||
else Run("INSERT INTO channel_avatars (space_id, avatar, thumb) VALUES (@c,@a,@t) ON CONFLICT(space_id) DO UPDATE SET avatar=excluded.avatar, thumb=excluded.thumb", ("@c", id.ToArray()), ("@a", avatar), ("@t", (object?)thumb ?? DBNull.Value));
|
||||
}
|
||||
|
||||
public IReadOnlyList<Id16> ListExpiredChannels(long now, int limit) =>
|
||||
|
||||
Reference in new issue
Block a user