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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);
 }

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();
+    }
+}

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();
     }