72 lines
3.2 KiB
C#
72 lines
3.2 KiB
C#
 
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using System.Security.Cryptography;
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using System.Text.Json;
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namespace PrivaPub.Federation.Actors
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{
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public static class ActorFeatures
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{
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public static List<string> Detect(JsonElement root)
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{
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var found = new List<string>();
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if (root.ValueKind != JsonValueKind.Object)
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return found;
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void When(bool condition, string feature)
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{
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if (condition)
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found.Add(feature);
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}
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bool Has(string name) => root.TryGetProperty(name, out var value) && value.ValueKind is not (JsonValueKind.Null or JsonValueKind.Undefined);
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bool True(string name) => root.TryGetProperty(name, out var value) && value.ValueKind == JsonValueKind.True;
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IEnumerable<JsonElement> Items(string name) => !root.TryGetProperty(name, out var value)
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? Enumerable.Empty<JsonElement>()
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: value.ValueKind == JsonValueKind.Array ? value.EnumerateArray() : new[] { value };
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bool Typed(JsonElement item, string type) =>
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item.ValueKind == JsonValueKind.Object && item.TryGetProperty("type", out var t) && t.ValueKind == JsonValueKind.String && t.GetString() == type;
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When(Has("featured"), "featured");
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When(Has("featuredTags"), "featured-tags");
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When(Items("alsoKnownAs").Any(), "also-known-as");
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When(Has("movedTo"), "moved-to");
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When(root.TryGetProperty("endpoints", out var endpoints) && endpoints.ValueKind == JsonValueKind.Object && endpoints.TryGetProperty("sharedInbox", out _), "shared-inbox");
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When(Has("assertionMethod"), "fep-521a-assertion-method");
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When(Has("proof"), "fep-8b32-proof");
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When(Items("attachment").Any(a => Typed(a, "PropertyValue")), "property-value");
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When(Items("attachment").Any(a => Typed(a, "VerifiableIdentityStatement") || Typed(a, "IdentityProof")), "fep-c390-identity-proof");
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When(Items("tag").Any(t => Typed(t, "Emoji")), "custom-emoji");
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When(root.EnumerateObject().Any(p => p.Name.StartsWith("_misskey", StringComparison.Ordinal)), "misskey");
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When(True("isCat"), "is-cat");
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When(Has("webfinger"), "fep-2c59-webfinger");
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When(Has("attributionDomains"), "attribution-domains");
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When(Has("searchableBy"), "fep-268d-searchable-by");
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When(True("indexable"), "indexable");
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When(root.TryGetProperty("discoverable", out var discoverable) && discoverable.ValueKind == JsonValueKind.False, "undiscoverable");
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When(True("manuallyApprovesFollowers"), "locked");
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When(True("memorial"), "memorial");
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When(Has("generator"), "generator");
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When(root.TryGetProperty("publicKey", out var keys) && keys.ValueKind == JsonValueKind.Array, "public-key-array");
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if (KeyBits(root) is { } bits)
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found.Add($"key:rsa-{bits}");
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return found;
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}
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static int? KeyBits(JsonElement root)
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{
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if (!root.TryGetProperty("publicKey", out var key))
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return default;
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if (key.ValueKind == JsonValueKind.Array)
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key = key.EnumerateArray().FirstOrDefault(k => k.ValueKind == JsonValueKind.Object);
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if (key.ValueKind != JsonValueKind.Object || !key.TryGetProperty("publicKeyPem", out var pem) || pem.ValueKind != JsonValueKind.String)
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return default;
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try
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{
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using var rsa = RSA.Create();
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rsa.ImportFromPem(pem.GetString());
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return rsa.KeySize;
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}
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catch (Exception ex) when (ex is ArgumentException or CryptographicException)
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{
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return default;
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}
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}
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}
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}
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