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WIP: UserResolver

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This commit is contained in:
Laura Hausmann 2024-01-09 20:00:54 +01:00
parent ad7ca2935f
commit 6ec6a43e1c
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GPG key ID: D044E84C5BE01605
2 changed files with 41 additions and 13 deletions
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31
Iceshrimp.Backend/Core/Federation/WebFinger/UserResolver.cs Normal file
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@ -0,0 +1,31 @@
using Iceshrimp.Backend.Core.Database.Tables;
namespace Iceshrimp.Backend.Core.Federation.WebFinger;
public static class UserResolver {
private static string AcctToDomain(string acct) =>
acct.StartsWith("acct:") && acct.Contains('@')
? acct[5..].Split('@')[1]
: throw new Exception("Invalid acct");
/*
* Split domain logic:
* 1. Get WebFinger response for query
* 2. [...]
* TODO: finish description and implement the rest
*/
public static async Task<User> Resolve(string query) {
var finger = new WebFinger(query);
var fingerRes = await finger.Resolve();
if (fingerRes == null) throw new Exception($"Failed to WebFinger '{query}'");
if (finger.Domain != AcctToDomain(fingerRes.Subject)) {
//TODO: Logger.info("possible split domain deployment detected, repeating webfinger")
finger = new WebFinger(fingerRes.Subject);
fingerRes = await finger.Resolve();
}
throw new NotImplementedException("stub method return");
}
}

23
Iceshrimp.Backend/Core/Federation/WebFinger/WebFinger.cs
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@ -1,7 +1,6 @@
using System.Net.Http.Headers; using System.Net.Http.Headers;
using System.Text.Encodings.Web; using System.Text.Encodings.Web;
using System.Xml; using System.Xml;
using Iceshrimp.Backend.Core.Configuration;
using Iceshrimp.Backend.Core.Helpers; using Iceshrimp.Backend.Core.Helpers;
namespace Iceshrimp.Backend.Core.Federation.WebFinger; namespace Iceshrimp.Backend.Core.Federation.WebFinger;
@ -16,18 +15,21 @@ namespace Iceshrimp.Backend.Core.Federation.WebFinger;
* - doesn't have a query url template * - doesn't have a query url template
*/ */
//FIXME: handle cursed person/group acct collisions like https://lemmy.ml/.well-known/webfinger?resource=acct:linux@lemmy.ml
public class WebFinger { public class WebFinger {
private readonly string _query; private readonly string _query;
private readonly string _proto; private readonly string _proto;
private readonly string _domain; private readonly string _domain;
private readonly string? _username;
private string? _webFingerUrl; private string? _webFingerUrl;
public string Domain => _domain;
private string HostMetaUrl => $"{_proto}://{_domain}/.well-known/host-meta"; private string HostMetaUrl => $"{_proto}://{_domain}/.well-known/host-meta";
private string DefaultWebFingerTemplate => $"{_proto}://{_domain}/.well-known/webfinger?resource={{uri}}"; private string DefaultWebFingerTemplate => $"{_proto}://{_domain}/.well-known/webfinger?resource={{uri}}";
public WebFinger(string query) { public WebFinger(string query) {
_query = query; _query = query.StartsWith("acct:") ? $"@{query[5..]}" : query;
if (_query.StartsWith("http://") || _query.StartsWith("https://")) { if (_query.StartsWith("http://") || _query.StartsWith("https://")) {
var uri = new Uri(_query); var uri = new Uri(_query);
_domain = uri.Host; _domain = uri.Host;
@ -37,17 +39,12 @@ public class WebFinger {
_proto = "https"; _proto = "https";
var split = _query.Split('@'); var split = _query.Split('@');
if (split.Length == 2) { if (split.Length is < 2 or > 3)
throw new Exception("Can't run WebFinger for local user");
}
if (split.Length == 3) {
_username = split[1];
_domain = split[2];
}
else {
throw new Exception("Invalid query"); throw new Exception("Invalid query");
} if (split.Length is 2)
throw new Exception("Can't run WebFinger for local user");
_domain = split[2];
} }
else { else {
throw new Exception("Invalid query"); throw new Exception("Invalid query");