@uppy/utils: add fetcher

packages/@uppy/utils/package.json

@@ -70,7 +70,8 @@
     "./lib/CompanionClientProvider": "./lib/CompanionClientProvider.js",
     "./lib/FileProgress": "./lib/FileProgress.js",
     "./src/microtip.scss": "./src/microtip.scss",
-    "./lib/UserFacingApiError": "./lib/UserFacingApiError.js"
+    "./lib/UserFacingApiError": "./lib/UserFacingApiError.js",
+    "./lib/fetcher": "./lib/fetcher.js"
   },
   "dependencies": {
     "lodash": "^4.17.21",

packages/@uppy/utils/src/fetcher.ts

@@ -0,0 +1,145 @@
+import NetworkError from './NetworkError.ts'
+import ProgressTimeout from './ProgressTimeout.ts'
+
+const noop = (): void => {}
+
+export type FetcherOptions = {
+  /** The HTTP method to use for the request. Default is 'GET'. */
+  method?: string
+
+  /** The request payload, if any. Default is null. */
+  body?: Document | XMLHttpRequestBodyInit | null
+
+  /** Milliseconds between XMLHttpRequest upload progress events before the request is aborted. Default is 30000 ms. */
+  timeout?: number
+
+  /** Sets the withCredentials property of the XMLHttpRequest object. Default is false. */
+  withCredentials?: boolean
+
+  /** Sets the responseType property of the XMLHttpRequest object. Default is an empty string. */
+  responseType?: XMLHttpRequestResponseType
+
+  /** An object representing any headers to send with the request. */
+  headers?: Record<string, string>
+
+  /** The number of retry attempts to make if the request fails. Default is 3. */
+  retries?: number
+
+  /** Called before the request is made. */
+  onBeforeRequest?: (
+    xhr: XMLHttpRequest,
+    retryCount: number,
+  ) => void | Promise<void>
+
+  /** Function for tracking upload progress. */
+  onUploadProgress?: (event: ProgressEvent) => void
+
+  /** A function to determine whether to retry the request. */
+  shouldRetry?: (xhr: XMLHttpRequest) => boolean
+
+  /** Called after the response has succeeded or failed but before the promise is resolved. */
+  onAfterRequest?: (
+    xhr: XMLHttpRequest,
+    retryCount: number,
+  ) => void | Promise<void>
+
+  /** Called when no XMLHttpRequest upload progress events have been received for `timeout` ms. */
+  onTimeout?: () => void
+
+  /** Signal to abort the upload. */
+  signal?: AbortSignal
+}
+
+/**
+ * Fetches data from a specified URL using XMLHttpRequest, with optional retry functionality and progress tracking.
+ *
+ * @param url The URL to send the request to.
+ * @param options Optional settings for the fetch operation.
+ */
+export function fetcher(
+  url: string,
+  options: FetcherOptions = {},
+): Promise<XMLHttpRequest> {
+  const {
+    body = null,
+    headers = {},
+    method = 'GET',
+    onBeforeRequest = noop,
+    onUploadProgress = noop,
+    shouldRetry = () => true,
+    onAfterRequest = noop,
+    onTimeout = noop,
+    responseType,
+    retries = 3,
+    signal = null,
+    timeout = 30_000,
+    withCredentials = false,
+  } = options
+
+  // 300 ms, 600 ms, 1200 ms, 2400 ms, 4800 ms
+  const delay = (attempt: number): number => 0.3 * 2 ** (attempt - 1) * 1000
+  const timer = new ProgressTimeout(timeout, onTimeout)
+
+  function requestWithRetry(retryCount = 0): Promise<XMLHttpRequest> {
+    // eslint-disable-next-line no-async-promise-executor
+    return new Promise(async (resolve, reject) => {
+      const xhr = new XMLHttpRequest()
+
+      xhr.open(method, url, true)
+      xhr.withCredentials = withCredentials
+      if (responseType) {
+        xhr.responseType = responseType
+      }
+
+      signal?.addEventListener('abort', () => {
+          xhr.abort()
+          // Using DOMException for abort errors aligns with
+          // the convention established by the Fetch API.
+          reject(new DOMException('Aborted', 'AbortError'))
+      })
+
+      xhr.onload = async () => {
+        await onAfterRequest(xhr, retryCount)
+
+        if (xhr.status >= 200 && xhr.status < 300) {
+          timer.done()
+          resolve(xhr)
+        } else if (shouldRetry(xhr) && retryCount < retries) {
+          setTimeout(() => {
+            requestWithRetry(retryCount + 1).then(resolve, reject)
+          }, delay(retryCount))
+        } else {
+          timer.done()
+          reject(new NetworkError(xhr.statusText, xhr))
+        }
+      }
+
+      xhr.onerror = () => {
+        if (shouldRetry(xhr) && retryCount < retries) {
+          setTimeout(() => {
+            requestWithRetry(retryCount + 1).then(resolve, reject)
+          }, delay(retryCount))
+        } else {
+          timer.done()
+          reject(new NetworkError(xhr.statusText, xhr))
+        }
+      }
+
+      xhr.upload.onprogress = (event: ProgressEvent) => {
+        timer.progress()
+        onUploadProgress(event)
+      }
+
+      if (headers) {
+        Object.keys(headers).forEach((key) => {
+          xhr.setRequestHeader(key, headers[key])
+        })
+      }
+
+      await onBeforeRequest(xhr, retryCount)
+      xhr.send(body)
+    })
+  }
+
+  return requestWithRetry()
+}