Stop using server API for getting absolute versions of dependencies

Author: CompuIves

packages/common/src/utils/dependencies.ts

@@ -1,4 +1,36 @@
-const host = process.env.CODESANDBOX_HOST;
+async function fetchWithRetries(url: string) {
+  let err: Error;
+  for (let i = 0; i < 3; i++) {
+    try {
+      // eslint-disable-next-line
+      return await fetch(url).then(x => {
+        if (x.ok) {
+          return x.json();
+        }
+
+        throw new Error('Could not fetch ' + url);
+      });
+    } catch (e) {
+      err = e;
+    }
+  }
+
+  throw err;
+}
+
+async function fetchPackageJSON(dep: string, version: string) {
+  try {
+    return await fetchWithRetries(
+      `https://unpkg.com/${dep}@${encodeURIComponent(version)}/package.json`
+    );
+  } catch (e) {
+    return fetchWithRetries(
+      `https://cdn.jsdelivr.net/npm/${dep}@${encodeURIComponent(
+        version
+      )}/package.json`
+    );
+  }
+}
 
 export async function getAbsoluteDependencies(dependencies: Object) {
   const nonAbsoluteDependencies = Object.keys(dependencies).filter(dep => {
@@ -14,14 +46,7 @@ export async function getAbsoluteDependencies(dependencies: Object) {
   await Promise.all(
     nonAbsoluteDependencies.map(async dep => {
       try {
-        const data = await window
-          .fetch(
-            `${host}/api/v1/dependencies/${dep}@${encodeURIComponent(
-              dependencies[dep]
-            )}`
-          )
-          .then(x => x.json())
-          .then(x => x.data);
+        const data = await fetchPackageJSON(dep, dependencies[dep]);
 
         newDependencies[dep] = data.version;
       } catch (e) {