cesnimda
61 lines
3.3 KiB
C#
61 lines
3.3 KiB
C#
using System.Text;
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using System.Text.Json;
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namespace JobTrackerApi.Models;
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public sealed record DashboardWidget(string Id, bool Visible, string Size);
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public sealed record DashboardLayout(int Version, long Revision, IReadOnlyList<DashboardWidget> Widgets)
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{
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public const int MaxBytes = 16 * 1024;
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// Responses cross a JavaScript client; the incremented revision must remain an exact integer there.
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private const long MaxRevision = 9_007_199_254_740_991L;
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private static readonly HashSet<string> KnownIds = new(StringComparer.Ordinal)
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{ "cards", "attention", "funnel", "activity", "stageAge", "sources", "salary", "companies", "skills" };
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public static DashboardLayout? Parse(JsonElement root, bool reading = false, long revision = 0)
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{
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if (root.ValueKind != JsonValueKind.Object || !root.TryGetProperty("version", out var version) || version.ValueKind != JsonValueKind.Number || !version.TryGetInt32(out var v) || v != 1
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|| !root.TryGetProperty("widgets", out var widgets) || widgets.ValueKind != JsonValueKind.Array || widgets.GetArrayLength() > 32) return null;
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if (!reading && (!root.TryGetProperty("revision", out var rev) || rev.ValueKind != JsonValueKind.Number || !rev.TryGetInt64(out revision) || revision < 0 || revision >= MaxRevision)) return null;
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var result = new List<DashboardWidget>();
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var seen = new HashSet<string>(StringComparer.Ordinal);
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foreach (var widget in widgets.EnumerateArray())
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{
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if (widget.ValueKind != JsonValueKind.Object || !widget.TryGetProperty("id", out var idValue) || idValue.ValueKind != JsonValueKind.String
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|| !KnownIds.Contains(idValue.GetString()!) || !seen.Add(idValue.GetString()!)
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|| !widget.TryGetProperty("visible", out var visible) || (visible.ValueKind != JsonValueKind.True && visible.ValueKind != JsonValueKind.False))
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{
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if (reading) continue;
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return null;
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}
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var id = idValue.GetString()!;
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var size = widget.TryGetProperty("size", out var sizeValue) && sizeValue.ValueKind == JsonValueKind.String ? sizeValue.GetString() : null;
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if (size is not ("standard" or "full") || (id == "cards" && size != "full"))
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{
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if (!reading) return null;
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size = id == "cards" ? "full" : "standard";
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}
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result.Add(new DashboardWidget(id, visible.GetBoolean(), size));
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}
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return new DashboardLayout(1, revision, result);
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}
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public static DashboardLayout Read(string? json, long revision)
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{
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if (json is not null && Encoding.UTF8.GetByteCount(json) <= MaxBytes)
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{
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try
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{
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using var document = JsonDocument.Parse(json);
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if (document.RootElement.ValueKind == JsonValueKind.Object
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&& document.RootElement.TryGetProperty("version", out var version) && version.ValueKind == JsonValueKind.Number
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&& version.TryGetInt32(out var futureVersion) && futureVersion > 1)
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return new(futureVersion, revision, []);
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return Parse(document.RootElement, reading: true, revision) ?? new(1, revision, []);
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}
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catch (JsonException) { }
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}
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return new(1, revision, []);
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}
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}
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