85 lines
No EOL
3.4 KiB
C#
85 lines
No EOL
3.4 KiB
C#
using System.Collections;
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using System.Globalization;
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using Newtonsoft.Json;
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using Newtonsoft.Json.Linq;
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using VDS.RDF;
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using VDS.RDF.JsonLd;
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using VDS.RDF.Parsing;
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using VDS.RDF.Writing.Formatting;
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namespace Iceshrimp.Backend.Core.Federation.ActivityStreams;
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public static class LDHelpers {
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private static readonly Dictionary<string, RemoteDocument> ContextCache = new() {
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{
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"https://www.w3.org/ns/activitystreams", new RemoteDocument {
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ContextUrl = new Uri("https://www.w3.org/ns/activitystreams"),
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DocumentUrl = new Uri("https://www.w3.org/ns/activitystreams"),
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Document = JToken.Parse(File.ReadAllText(Path.Combine("Core", "Federation", "ActivityStreams",
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"Contexts", "as.json")))
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}
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}, {
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"https://w3id.org/security/v1", new RemoteDocument {
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ContextUrl = new Uri("https://w3id.org/security/v1"),
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DocumentUrl = new Uri("https://w3c-ccg.github.io/security-vocab/contexts/security-v1.jsonld"),
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Document = JToken.Parse(File.ReadAllText(Path.Combine("Core", "Federation", "ActivityStreams",
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"Contexts", "security.json")))
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}
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}
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};
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private static readonly JToken DefaultContext =
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JToken.Parse(File.ReadAllText(Path.Combine("Core", "Federation", "ActivityStreams", "Contexts",
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"default.json")));
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// Nonstandard extensions to the AS context need to be loaded in to fix federation with certain AP implementations
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private static readonly JToken ASExtensions =
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JToken.Parse(File.ReadAllText(Path.Combine("Core", "Federation", "ActivityStreams", "Contexts",
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"as-extensions.json")));
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private static readonly JsonLdProcessorOptions Options = new() {
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DocumentLoader = CustomLoader, ExpandContext = ASExtensions
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};
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private static RemoteDocument CustomLoader(Uri uri, JsonLdLoaderOptions jsonLdLoaderOptions) {
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//TODO: cache in redis
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RemoteDocument? result;
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ContextCache.TryGetValue(uri.ToString(), out result);
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if (result != null) return result;
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result = DefaultDocumentLoader.LoadJson(uri, jsonLdLoaderOptions);
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ContextCache.Add(uri.ToString(), result);
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return result;
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}
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private static string NormalizeForSignature(IEnumerable input) {
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//TODO: Find a way to convert JSON-LD to RDF directly
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//TODO: Fix XMLSchema#string thingy /properly/
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var store = new TripleStore();
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new JsonLdParser(new JsonLdProcessorOptions { DocumentLoader = CustomLoader, PruneBlankNodeIdentifiers = true })
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.Load(store, new StringReader(JsonConvert.SerializeObject(input)));
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//Console.WriteLine(store.Triples.SkipLast(1).Last().Object);
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var formatter = new NQuadsFormatter(NQuadsSyntax.Rdf11);
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Thread.CurrentThread.CurrentCulture = CultureInfo.InvariantCulture;
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var ordered = store.Triples
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.Select(p => formatter.Format(p).Replace("^^<http://www.w3.org/2001/XMLSchema#string>", ""))
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.Order().ToList();
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var processedP1 = ordered.Where(p => p.StartsWith('_')).ToList();
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var processedP2 = ordered.Except(processedP1);
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return string.Join('\n', processedP2.Union(processedP1));
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}
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public static JArray? Expand(JToken? json) {
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return JsonLdProcessor.Expand(json, Options);
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}
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public static JObject? Compact(JToken? json) {
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return JsonLdProcessor.Compact(json, DefaultContext, Options);
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}
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public static JObject? Compact(object obj) {
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return Compact(JToken.FromObject(obj));
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}
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} |