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nextjs/src/services/canvas/canvasServiceUtils.ts

@@ -0,0 +1,59 @@
+// services/canvasServiceUtils.ts
+
+import { webRequestor } from "./webRequestor";
+
+const BASE_URL = "https://snow.instructure.com/api/v1/";
+
+const getNextUrl = (headers: Headers): string | undefined => {
+  const linkHeader = headers.get("Link");
+  if (!linkHeader) return undefined;
+
+  const links = linkHeader.split(",").map((link) => link.trim());
+  const nextLink = links.find((link) => link.includes('rel="next"'));
+
+  if (!nextLink) return undefined;
+
+  const nextUrl = nextLink.split(";")[0].trim().slice(1, -1);
+  return nextUrl.replace(BASE_URL, "").trim();
+};
+
+export const canvasServiceUtils = {
+  async paginatedRequest<T>(request: { url: string }): Promise<T[]> {
+    var requestCount = 1;
+    const url = new URL(request.url!, BASE_URL);
+    url.searchParams.set("per_page", "100");
+
+    const [firstData, firstResponse] = await webRequestor.get<T>(
+      url.toString()
+    );
+
+    if (!firstResponse.ok) {
+      console.error(
+        "error in response",
+        firstResponse.statusText,
+        firstResponse.body
+      );
+      throw new Error("error in response");
+    }
+
+    var returnData: T[] = firstData ? [firstData] : [];
+    var nextUrl = getNextUrl(firstResponse.headers);
+
+    while (nextUrl) {
+      requestCount += 1;
+      const [data, response] = await webRequestor.get<T>(nextUrl);
+      if (data) {
+        returnData = [...returnData, data];
+      }
+      nextUrl = getNextUrl(response.headers);
+    }
+
+    if (requestCount > 1) {
+      console.log(
+        `Requesting ${typeof returnData} took ${requestCount} requests`
+      );
+    }
+
+    return returnData;
+  },
+};