Add web polyfills

1 files changed, 76 insertions, 0 deletions

diff --git a/src/state/lib/api-polyfill.ts b/src/state/lib/api-polyfill.ts
new file mode 100644
index 000000000..be6f90f7a
--- /dev/null
+++ b/src/state/lib/api-polyfill.ts
@@ -0,0 +1,76 @@
+import {sessionClient as AtpApi} from '@atproto/api'
+
+export function doPolyfill() {
+  AtpApi.xrpc.fetch = fetchHandler
+}
+
+interface FetchHandlerResponse {
+  status: number
+  headers: Record<string, string>
+  body: ArrayBuffer | undefined
+}
+
+async function fetchHandler(
+  reqUri: string,
+  reqMethod: string,
+  reqHeaders: Record<string, string>,
+  reqBody: any,
+): Promise<FetchHandlerResponse> {
+  const reqMimeType = reqHeaders['Content-Type'] || reqHeaders['content-type']
+  if (reqMimeType && reqMimeType.startsWith('application/json')) {
+    reqBody = JSON.stringify(reqBody)
+  } else if (
+    typeof reqBody === 'string' &&
+    (reqBody.startsWith('/') || reqBody.startsWith('file:'))
+  ) {
+    if (reqBody.endsWith('.jpeg') || reqBody.endsWith('.jpg')) {
+      // HACK
+      // React native has a bug that inflates the size of jpegs on upload
+      // we get around that by renaming the file ext to .bin
+      // see https://github.com/facebook/react-native/issues/27099
+      // -prf
+      const newPath = reqBody.replace(/\.jpe?g$/, '.bin')
+      await RNFS.moveFile(reqBody, newPath)
+      reqBody = newPath
+    }
+    // NOTE
+    // React native treats bodies with {uri: string} as file uploads to pull from cache
+    // -prf
+    reqBody = {uri: reqBody}
+  }
+
+  const controller = new AbortController()
+  const to = setTimeout(() => controller.abort(), TIMEOUT)
+
+  const res = await fetch(reqUri, {
+    method: reqMethod,
+    headers: reqHeaders,
+    body: reqBody,
+    signal: controller.signal,
+  })
+
+  const resStatus = res.status
+  const resHeaders: Record<string, string> = {}
+  res.headers.forEach((value: string, key: string) => {
+    resHeaders[key] = value
+  })
+  const resMimeType = resHeaders['Content-Type'] || resHeaders['content-type']
+  let resBody
+  if (resMimeType) {
+    if (resMimeType.startsWith('application/json')) {
+      resBody = await res.json()
+    } else if (resMimeType.startsWith('text/')) {
+      resBody = await res.text()
+    } else {
+      throw new Error('TODO: non-textual response body')
+    }
+  }
+
+  clearTimeout(to)
+
+  return {
+    status: resStatus,
+    headers: resHeaders,
+    body: resBody,
+  }
+}