From 1a14beda3ac954cc0ea7bbed476c9fa316abe3d9 Mon Sep 17 00:00:00 2001
From: femsci <nya@femboy.science>
Date: Mon, 6 May 2024 12:40:10 +0200
Subject: [PATCH] =?UTF-8?q?=F0=9F=A5=BA?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
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---
 .../{ => Access}/IResolver.cs                 |  5 ++-
 src/Nyanlabs.Pubresolv/DocumentResolver.cs    | 41 +++++++++++++++++++
 src/Nyanlabs.Pubresolv/Pubresolv.cs           |  4 +-
 3 files changed, 47 insertions(+), 3 deletions(-)
 rename src/Nyanlabs.Pubresolv/{ => Access}/IResolver.cs (55%)
 create mode 100644 src/Nyanlabs.Pubresolv/DocumentResolver.cs

diff --git a/src/Nyanlabs.Pubresolv/IResolver.cs b/src/Nyanlabs.Pubresolv/Access/IResolver.cs
similarity index 55%
rename from src/Nyanlabs.Pubresolv/IResolver.cs
rename to src/Nyanlabs.Pubresolv/Access/IResolver.cs
index f91038b..a804d4e 100644
--- a/src/Nyanlabs.Pubresolv/IResolver.cs
+++ b/src/Nyanlabs.Pubresolv/Access/IResolver.cs
@@ -1,9 +1,10 @@
 using System.Net;
 
-namespace Nyanlabs.Pubresolv;
+namespace Nyanlabs.Pubresolv.Access;
 
-public interface IResolver
+public interface IAccessor
 {
     public Task Resolve(Doi doi);
+    public string Host { get; }
     public Task<bool> Authenticate(ICredentials credentials);
 }
diff --git a/src/Nyanlabs.Pubresolv/DocumentResolver.cs b/src/Nyanlabs.Pubresolv/DocumentResolver.cs
new file mode 100644
index 0000000..8ccbd3f
--- /dev/null
+++ b/src/Nyanlabs.Pubresolv/DocumentResolver.cs
@@ -0,0 +1,41 @@
+using System;
+using System.Collections.Generic;
+using System.Data;
+using System.Linq;
+using System.Reflection;
+using System.Threading.Tasks;
+using Nyanlabs.Pubresolv.Access;
+
+namespace Nyanlabs.Pubresolv;
+
+public class DocumentResolver : IDisposable
+{
+    private readonly HttpClient _cli = new();
+
+    public async Task<IAccessor> Resolve(Doi doi)
+    {
+        var resp = await _cli.GetAsync(new Uri($"https://doi.org/{doi}"));
+        resp.EnsureSuccessStatusCode();
+        Uri? redirect = resp.Headers.Location ?? throw new DataException("Cannot resolve DOI.");
+        return Resolve(redirect);
+    }
+
+    public IAccessor Resolve(Uri uri)
+    {
+        string host = uri.Host;
+        var accessor = Pubresolv.GetResolvers().SingleOrDefault(s => s.Host.Equals(host, StringComparison.OrdinalIgnoreCase));
+
+        if (accessor is null)
+        {
+            throw new DataException("This URI does not have a bound accessor.");
+        }
+
+        return accessor;
+    }
+
+    public void Dispose()
+    {
+        GC.SuppressFinalize(this);
+        _cli.Dispose();
+    }
+}
diff --git a/src/Nyanlabs.Pubresolv/Pubresolv.cs b/src/Nyanlabs.Pubresolv/Pubresolv.cs
index ca7fd1c..52ad547 100644
--- a/src/Nyanlabs.Pubresolv/Pubresolv.cs
+++ b/src/Nyanlabs.Pubresolv/Pubresolv.cs
@@ -1,8 +1,10 @@
+using Nyanlabs.Pubresolv.Access;
+
 namespace Nyanlabs.Pubresolv;
 
 public class Pubresolv
 {
-    public ICollection<IResolver> GetResolvers()
+    public static ICollection<IAccessor> GetResolvers()
     {
         throw new NotImplementedException();
     }