commit pre-purge

Management/Services/CanvasService.cs

@@ -1,4 +1,68 @@
+using CanvasModel.Courses;
+using CanvasModel.EnrollmentTerms;
+using RestSharp;
 public class CanvasService
 {
-  
+  private const string BaseUrl = "https://snow.instructure.com/api/v1/";
+  private readonly IWebRequestor webRequestor;
+  private RestClient client;
+  private string courseid { get; }
+  public CanvasService(IWebRequestor webRequestor)
+  {
+    courseid = "774898";
+    this.webRequestor = webRequestor;
+  }
+
+  public async Task<IEnumerable<EnrollmentTermModel>> GetTerms()
+  {
+    var url = $"accounts/10/terms";
+
+    var request = new RestRequest(url);
+    var terms = await PaginatedRequest<EnrollmentTermModel>(request);
+    return terms;
+  }
+
+  private async Task<IEnumerable<T>> PaginatedRequest<T>(RestRequest request)
+  {
+    var requestCount = 1;
+    request.AddQueryParameter("per_page", "100");
+    IEnumerable<T> returnData = new T[] { };
+    RestResponse<T[]> response = await webRequestor.GetAsync<T>(request);
+    returnData = returnData.Concat(response.Data);
+
+    var nextUrl = getNextUrl(response);
+
+    while (nextUrl is not null)
+    {
+      requestCount += 1;
+      var nextRequest = new RestRequest(nextUrl);
+      var nextResponse = await webRequestor.GetAsync<T>(nextRequest);
+      if (nextResponse.Data is not null)
+        returnData = returnData.Concat(nextResponse.Data);
+      nextUrl = getNextUrl(nextResponse);
+    }
+
+    System.Console.WriteLine($"Requesting {typeof(T)} took {requestCount} requests");
+
+    return returnData;
+  }
+
+
+  private static string? getNextUrl<T>(RestResponse<T[]> response) => response.Headers?
+      .ToList()
+      .Find(h => h.Name == "Link")?
+      .Value?
+      .ToString()?
+      .Split(",")
+      .Where(url => url.Contains("rel=\"next\""))
+      .FirstOrDefault()?
+      .Split(";")
+      .FirstOrDefault()?
+      .TrimEnd('>')
+      .TrimStart('<')
+      .Replace(" ", "")
+      .Replace(BaseUrl, "");
+
+
+
 }