moved access token to browser based

Management/Services/ICanvasTokenManagement.cs

@@ -0,0 +1,5 @@
+public interface ICanvasTokenManagement
+{
+  Task<string?> GetCanvasToken();
+  Task SaveCanvasToken(string token);
+}

Management/Services/WebRequestor.cs

@@ -3,32 +3,46 @@ using RestSharp;
 public class WebRequestor : IWebRequestor
 {
   private const string BaseUrl = "https://snow.instructure.com/api/v1/";
-  private string token;
+  private bool tokenSet = false;
   private RestClient client;
 
-  public WebRequestor()
+  private ICanvasTokenManagement tokenManagement { get; }
+
+  public WebRequestor(ICanvasTokenManagement tokenManagement)
   {
-    token =
-      Environment.GetEnvironmentVariable("CANVAS_TOKEN")
-      ?? throw new Exception("CANVAS_TOKEN not in environment");
     client = new RestClient(BaseUrl);
-    client.AddDefaultHeader("Authorization", $"Bearer {token}");
+    this.tokenManagement = tokenManagement;
   }
 
+  private async Task EnsureCanvasTokenSet()
+  {
+    if (tokenSet)
+      return;
+    
+    var newToken = await tokenManagement.GetCanvasToken();
+    if(newToken == null)
+      throw new Exception("cannot request canvas, no token in storage");
+    
+    client.AddDefaultHeader("Authorization", $"Bearer {newToken}");
+    tokenSet = true;
+  }
   public async Task<(T[]?, RestResponse)> GetManyAsync<T>(RestRequest request)
   {
+    await EnsureCanvasTokenSet();
     var response = await client.ExecuteGetAsync(request);
     return (Deserialize<T[]>(response), response);
   }
 
   public async Task<(T?, RestResponse)> GetAsync<T>(RestRequest request)
   {
+    await EnsureCanvasTokenSet();
     var response = await client.ExecuteGetAsync(request);
     return (Deserialize<T>(response), response);
   }
 
   public async Task<RestResponse> PostAsync(RestRequest request)
   {
+    await EnsureCanvasTokenSet();
     var response = await client.ExecutePostAsync(request);
     if (!response.IsSuccessful)
     {
@@ -42,6 +56,7 @@ public class WebRequestor : IWebRequestor
 
   public async Task<(T?, RestResponse)> PostAsync<T>(RestRequest request)
   {
+    await EnsureCanvasTokenSet();
     var response = await client.ExecutePostAsync(request);
     return (Deserialize<T>(response), response);
   }