68 lines
2.8 KiB
C#
68 lines
2.8 KiB
C#
 
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using System.Text.Json.Nodes;
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using static PrivaPub.Federation.Objects.ActivityJson;
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namespace PrivaPub.Federation.Objects
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{
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public static class ObjectFeatures
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{
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public static List<string> Detect(JsonObject raw)
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{
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var found = new List<string>();
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if (raw == default)
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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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When(raw.ContainsKey("quote"), "fep-044f-quote");
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When(raw.ContainsKey("quoteAuthorization"), "fep-044f-authorization");
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When(raw.ContainsKey("_misskey_quote") || raw.ContainsKey("quoteUrl") || raw.ContainsKey("quoteUri"), "legacy-quote");
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When(raw.ContainsKey("interactionPolicy"), "interaction-policy");
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When(raw.ContainsKey("context"), "context");
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When(raw.ContainsKey("proof"), "fep-8b32-proof");
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When(raw.Any(p => p.Key.StartsWith("_misskey_", StringComparison.Ordinal)), "misskey");
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When(raw["source"] is JsonObject, "source:" + (Value(raw["source"], "mediaType") ?? "unknown"));
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When(raw["source"] is JsonValue, "source:url");
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When(raw.ContainsKey("htmlMfm"), "fep-c16b-mfm");
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When(raw.ContainsKey("formerRepresentations"), "former-representations");
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When(raw.ContainsKey("searchableBy"), "fep-268d-searchable-by");
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When(raw.ContainsKey("audience"), "fep-1b12-audience");
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When(Items(raw["attachment"]).Any(a => Value(a, "type") == "Link"), "fep-8967-link");
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When(Items(raw["tag"]).Any(t => Value(t, "type") == "Emoji"), "custom-emoji");
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When(Value(raw, "type") == "Question", "poll");
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When(raw["contentMap"] is JsonObject, "content-map");
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When(raw["url"] is JsonArray, "url-variants");
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var contentType = Value(raw, "mediaType");
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When(contentType is not (null or "text/html"), "content:" + contentType);
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return found;
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}
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public static List<string> Namespaces(JsonObject raw, string activityContext = default) =>
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Namespaces(raw?["@context"] ?? (activityContext == default ? default : JsonNode.Parse(activityContext)));
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static List<string> Namespaces(JsonNode context) => context switch
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{
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JsonValue single when single.TryGetValue<string>(out var url) => new List<string> { url },
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JsonArray array => array.SelectMany(entry => entry switch
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{
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JsonValue value when value.TryGetValue<string>(out var url) => new[] { url },
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JsonObject terms => terms.Where(t => t.Value is JsonValue v && v.TryGetValue<string>(out var target) && target.EndsWith('#'))
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.Select(t => t.Key + "=" + t.Value!.GetValue<string>()),
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_ => Enumerable.Empty<string>()
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})
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.Take(32)
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.ToList(),
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_ => new List<string>()
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};
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static IEnumerable<JsonObject> Items(JsonNode node) => node switch
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{
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JsonArray array => array.OfType<JsonObject>(),
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JsonObject single => new[] { single },
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_ => Enumerable.Empty<JsonObject>()
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};
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}
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}
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