Separate creating createFileUrl and shortlink so it is unit testable

src/lib/links.ts

@@ -0,0 +1,65 @@
+import { UnitLength_type } from '@kittycad/lib/dist/types/src/models'
+import { ASK_TO_OPEN_QUERY_PARAM, CREATE_FILE_URL_PARAM, PROD_APP_URL } from './constants'
+import { stringToBase64 } from './base64'
+import { DEV } from 'env'
+export interface FileLinkParams {
+  code: string
+  name: string
+  units: UnitLength_type
+}
+
+/**
+ * Creates a URL with the necessary query parameters to trigger
+ * the "Import file from URL" command in the app.
+ * 
+ * With the additional step of asking the user if they want to 
+ * open the URL in the desktop app.
+ */
+export function createCreateFileUrl({ code, name, units }: FileLinkParams) {
+  // Use the dev server if we are in development mode
+  let origin = DEV ? 'http://localhost:3000' : PROD_APP_URL
+  const searchParams = new URLSearchParams({
+    [CREATE_FILE_URL_PARAM]: '',
+    name,
+    units,
+    code: stringToBase64(code),
+    [ASK_TO_OPEN_QUERY_PARAM]: '',
+  })
+  const createFileUrl = new URL(`?${searchParams.toString()}`, origin)
+
+  return createFileUrl
+}
+
+/**
+ * Given a file's code, name, and units, creates shareable link to the
+ * web app with a query parameter that triggers a modal to "open in desktop app".
+ * That modal is defined in the `OpenInDesktopAppHandler` component.
+ * TODO: update the return type to use TS library after its updated
+ */
+export async function createShortlink(
+  token: string,
+  url: string
+): Promise<Error | { key: string; url: string }> {
+  /**
+   * We don't use our `withBaseURL` function here because
+   * there is no URL shortener service in the dev API.
+   */
+  const response = await fetch('https://api.zoo.dev/user/shortlinks', {
+    method: 'POST',
+    headers: {
+      'Content-type': 'application/json',
+      Authorization: `Bearer ${token}`,
+    },
+    body: JSON.stringify({
+      url,
+      // In future we can support org-scoped and password-protected shortlinks here
+      // https://zoo.dev/docs/api/shortlinks/create-a-shortlink-for-a-user?lang=typescript
+    }),
+  })
+  if (!response.ok) {
+    const error = await response.json()
+    return new Error(`Failed to create shortlink: ${error.message}`)
+  } else {
+    return response.json()
+  }
+}