[eas-cli] Detect valid JSON files during hosting upload (#2829)

* Use application/json as content type for valid JSON without an extension

* Add changelog

* Pull getContentTypeAsync to a separate function

CHANGELOG.md

@@ -11,6 +11,7 @@ This is the log of notable changes to EAS CLI and related packages.
 - Allow filtering by `--fingerprint_hash` in `eas build:list` command. ([#2818](https://github.com/expo/eas-cli/pull/2818) by [@szdziedzic](https://github.com/szdziedzic))
 
 ### 🐛 Bug fixes
+- Ensure that the AASA file is served with content type application/json ([#2829](https://github.com/expo/eas-cli/pull/2829) by [@kadikraman](https://github.com/kadikraman))
 
 ### 🧹 Chores
 - Fix logs typos in the `eas deploy` command. ([#2822](https://github.com/expo/eas-cli/pull/2822) by [@kadikraman](https://github.com/kadikraman))

packages/eas-cli/src/worker/upload.ts

@@ -4,6 +4,7 @@ import mime from 'mime';
 import { Gzip } from 'minizlib';
 import fetch, { Headers, HeadersInit, RequestInit, Response } from 'node-fetch';
 import fs, { createReadStream } from 'node:fs';
+import { readFile } from 'node:fs/promises';
 import path from 'node:path';
 import promiseRetry from 'promise-retry';
 
@@ -28,6 +29,24 @@ const isCompressible = (contentType: string | null, size: number): boolean => {
   }
 };
 
+const getContentTypeAsync = async (filePath: string): Promise<string | null> => {
+  let contentType = mime.getType(path.basename(filePath));
+
+  if (!contentType) {
+    const fileContent = await readFile(filePath, 'utf-8');
+    try {
+      // check if file is valid JSON without an extension, e.g. for the apple app site association file
+      const parsedData = JSON.parse(fileContent);
+
+      if (parsedData) {
+        contentType = 'application/json';
+      }
+    } catch {}
+  }
+
+  return contentType;
+};
+
 export interface UploadParams extends Omit<RequestInit, 'signal' | 'body'> {
   filePath: string;
   compress?: boolean;
@@ -70,14 +89,15 @@ export async function uploadAsync(params: UploadParams): Promise<UploadResult> {
     headers: headersInit,
     ...requestInit
   } = params;
-  const stat = await fs.promises.stat(params.filePath);
+  const stat = await fs.promises.stat(filePath);
   if (stat.size > MAX_UPLOAD_SIZE) {
     throw new Error(
-      `Upload of "${params.filePath}" aborted: File size is greater than the upload limit (>500MB)`
+      `Upload of "${filePath}" aborted: File size is greater than the upload limit (>500MB)`
     );
   }
 
-  const contentType = mime.getType(path.basename(params.filePath));
+  const contentType = await getContentTypeAsync(filePath);
+
   return await promiseRetry(
     async retry => {
       const headers = new Headers(headersInit);