From 64aedaa9e9c909587f925c8d07c9292dd82a8285 Mon Sep 17 00:00:00 2001
From: tomcrane <tom@nanoplanet.com>
Date: Mon, 27 Nov 2023 19:06:24 +0000
Subject: [PATCH] fedora proxy

---
 LeedsExperiment/Fedora/IFedora.cs             | 14 ++++++++
 .../Controllers/FedoraController.cs           | 28 ++++++++++++++++
 LeedsExperiment/Preservation.API/Program.cs   | 12 +++++++
 LeedsExperiment/Preservation/Fedora.cs        | 32 +++++++++++++++++++
 .../Preservation/Preservation.csproj          |  4 +++
 5 files changed, 90 insertions(+)
 create mode 100644 LeedsExperiment/Fedora/IFedora.cs
 create mode 100644 LeedsExperiment/Preservation.API/Controllers/FedoraController.cs
 create mode 100644 LeedsExperiment/Preservation/Fedora.cs

diff --git a/LeedsExperiment/Fedora/IFedora.cs b/LeedsExperiment/Fedora/IFedora.cs
new file mode 100644
index 0000000..5b556c1
--- /dev/null
+++ b/LeedsExperiment/Fedora/IFedora.cs
@@ -0,0 +1,14 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Fedora
+{
+    public interface IFedora
+    {
+        public Task<string> Proxy(string contentType, string path);
+
+    }
+}
diff --git a/LeedsExperiment/Preservation.API/Controllers/FedoraController.cs b/LeedsExperiment/Preservation.API/Controllers/FedoraController.cs
new file mode 100644
index 0000000..e9e347c
--- /dev/null
+++ b/LeedsExperiment/Preservation.API/Controllers/FedoraController.cs
@@ -0,0 +1,28 @@
+using Fedora;
+using Microsoft.AspNetCore.Mvc;
+
+namespace Preservation.API.Controllers
+{
+    [ApiController]
+    [Route("api/fedora")]
+    public class FedoraController : Controller
+    {
+        private IFedora fedora;
+
+        public FedoraController(IFedora fedora) 
+        {
+            this.fedora = fedora;
+        }
+
+        [HttpGet(Name = "FedoraProxy")]
+        [Route("{contentTypeMajor}/{contentTypeMinor}/{*path}")]
+        public async Task<IActionResult> Index(string contentTypeMajor, string contentTypeMinor, string? path)
+        {
+            // in WebAPI, path is not giving us the full path
+            var fullPath = string.Join("/", Request.Path.ToString().Split('/')[5..]);
+            var contentType = $"{contentTypeMajor}/{contentTypeMinor}";
+            var result = await fedora.Proxy(contentType, fullPath);
+            return Content(result, contentType);
+        }
+    }
+}
diff --git a/LeedsExperiment/Preservation.API/Program.cs b/LeedsExperiment/Preservation.API/Program.cs
index 632a615..8a2540a 100644
--- a/LeedsExperiment/Preservation.API/Program.cs
+++ b/LeedsExperiment/Preservation.API/Program.cs
@@ -1,3 +1,6 @@
+using Fedora;
+using System.Net.Http.Headers;
+
 var builder = WebApplication.CreateBuilder(args);
 
 // Add services to the container.
@@ -7,6 +10,15 @@
 builder.Services.AddEndpointsApiExplorer();
 builder.Services.AddSwaggerGen();
 
+builder.Services.AddHttpClient<IFedora, Preservation.Fedora>(client =>
+{
+    client.BaseAddress = new Uri(builder.Configuration["FedoraApiRoot"]!);
+    var authHeader = Convert.ToBase64String(System.Text.ASCIIEncoding.ASCII.GetBytes(
+               $"{builder.Configuration["FedoraAdminUser"]}:{builder.Configuration["FedoraAdminPassword"]}"));
+    client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Basic", authHeader);
+    client.DefaultRequestHeaders.Add("Accept", "application/ld+json");
+});
+
 var app = builder.Build();
 
 // Configure the HTTP request pipeline.
diff --git a/LeedsExperiment/Preservation/Fedora.cs b/LeedsExperiment/Preservation/Fedora.cs
new file mode 100644
index 0000000..cf8c289
--- /dev/null
+++ b/LeedsExperiment/Preservation/Fedora.cs
@@ -0,0 +1,32 @@
+using Fedora;
+using Preservation.API;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Net.Http.Json;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Preservation
+{
+    public class Fedora : IFedora
+    {
+        private readonly HttpClient _httpClient;
+
+        public Fedora(HttpClient httpClient)
+        {
+            _httpClient = httpClient;
+        }
+
+        public async Task<string> Proxy(string contentType, string path)
+        {
+            var req = new HttpRequestMessage();
+            req.Headers.Accept.Clear();
+            req.Headers.Accept.Add(new System.Net.Http.Headers.MediaTypeWithQualityHeaderValue(contentType));
+            req.RequestUri = new Uri(path, UriKind.Relative);
+            var response = await _httpClient.SendAsync(req);
+            var raw = await response.Content.ReadAsStringAsync();
+            return raw;
+        }
+    }
+}
diff --git a/LeedsExperiment/Preservation/Preservation.csproj b/LeedsExperiment/Preservation/Preservation.csproj
index fa71b7a..2bd0513 100644
--- a/LeedsExperiment/Preservation/Preservation.csproj
+++ b/LeedsExperiment/Preservation/Preservation.csproj
@@ -6,4 +6,8 @@
     <Nullable>enable</Nullable>
   </PropertyGroup>
 
+  <ItemGroup>
+    <ProjectReference Include="..\Fedora\Fedora.csproj" />
+  </ItemGroup>
+
 </Project>