Arthur Lee
f78526ce3d
Summary: Fixes https://github.com/facebook/react-native/issues/27099 When you upload a local file using XHR + the `FormData` API, RN uses `RCTNetworkTask` to retrieve the image file data from the local filesystem (request URL is a file:// URL) ([code pointer](https://github.com/facebook/react-native/blob/master/Libraries/Network/RCTNetworking.mm#L398)). As a result, if you are uploading a local image file that is in the app's directory `RCTNetworkTask` will end up using `RCTLocalAssetImageLoader` to load the image, which reads the image into a `UIImage` and then re-encodes it using `UIImageJPEGRepresentation` with a compression quality of 1.0, which is the higest ([code pointer](https://github.com/facebook/react-native/blob/4c5182c1cc8bafb15490adf602c87cb5bf289ffd/Libraries/Image/RCTImageLoader.mm#L1114)). Not only is this unnecessary, it ends up inflating the size of the jpg if it had been previously compressed to a lower quality. With this PR, this issue is fixed by forcing the `RCTFileRequestHandler` to be used when retrieving local files for upload, regardless of whether they are images or not. As a result, any file to be uploaded gets read into `NSData` which is the format needed when appending to the multipart body. I considered fixing this by modifying the behavior of how the handlers were chosen, but this felt like a safer fix since it will be scoped to just uploads and wont affect image fetching. ## Changelog [iOS] [Fixed] - Avoid re-encoding images when uploading local files Pull Request resolved: https://github.com/facebook/react-native/pull/31457 Test Plan: The repro for this is a bit troublesome, especially because this issue doesn't repro in RNTester. There is [some code](https://github.com/facebook/react-native/blob/master/packages/rn-tester/RNTester/AppDelegate.mm#L220) that is to be overriding the handlers that will be used, excluding the `RCTImageLoader`. I had to repro this in a fresh new RN app. 1. Create a blank RN app 2. Put an image in the folder of the app's install location. This would be similar to where files might be placed after an app downloads or captures an image. 3. Set up a quick express server that accepts multipart form uploads and stores the files 4. Trigger an upload via react native ``` const data = new FormData(); data.append('image', { uri: '/Users/arthur.lee/Library/Developer/CoreSimulator/Devices/46CDD981 (https://github.com/facebook/react-native/commit/d0c8cb12f21604fd9730e275a52816d7fd00a826)-9164-4925-9025-1A76C0D9 (https://github.com/facebook/react-native/commit/1946aee3d9696384d38890269ea705cafd472827)F0F5/data/Containers/Bundle/Application/B1E8A764-6221-4EA9-BE9A-2CB1699FD218 (https://github.com/facebook/react-native/commit/1c92b1cff623ea3f3b78238b146ab001626ef305)/test.app/test.bundle/compressed.jpg', type: 'image/jpeg', name: 'image.jpeg', }); fetch(`http://localhost:3000/upload`, { method: 'POST', headers: {'Content-Type': 'multipart/form-data'}, body: data, }).then(console.log); ``` 5. Trigger the upload with and without this patch Original file: ``` $ ls -lh total 448 -rw-r--r-- 1 arthur.lee staff 223K Apr 29 17:08 compressed.jpg ``` Uploaded file (with and without patch): ``` $ ls -lh total 1624 -rw-r--r--@ 1 arthur.lee staff 584K Apr 29 17:11 image-nopatch.jpeg -rw-r--r--@ 1 arthur.lee staff 223K Apr 29 17:20 image-withpatch.jpeg ``` Would appreciate pointers on whether this needs to be tested more extensively Reviewed By: yungsters Differential Revision: D28630805 Pulled By: PeteTheHeat fbshipit-source-id: 606a6091fa3e817966548c5eb84b19cb8b9abb1c
React Native
Learn once, write anywhere:
Build mobile apps with React.
Getting Started · Learn the Basics · Showcase · Contribute · Community · Support
React Native brings React's declarative UI framework to iOS and Android. With React Native, you use native UI controls and have full access to the native platform.
- Declarative. React makes it painless to create interactive UIs. Declarative views make your code more predictable and easier to debug.
- Component-Based. Build encapsulated components that manage their state, then compose them to make complex UIs.
- Developer Velocity. See local changes in seconds. Changes to JavaScript code can be live reloaded without rebuilding the native app.
- Portability. Reuse code across iOS, Android, and other platforms.
React Native is developed and supported by many companies and individual core contributors. Find out more in our ecosystem overview.
Contents
- Requirements
- Building your first React Native app
- Documentation
- Upgrading
- How to Contribute
- Code of Conduct
- License
📋 Requirements
React Native apps may target iOS 11.0 and Android 5.0 (API 21) or newer. You may use Windows, macOS, or Linux as your development operating system, though building and running iOS apps is limited to macOS. Tools like Expo can be used to work around this.
🎉 Building your first React Native app
Follow the Getting Started guide. The recommended way to install React Native depends on your project. Here you can find short guides for the most common scenarios:
📖 Documentation
The full documentation for React Native can be found on our website.
The React Native documentation discusses components, APIs, and topics that are specific to React Native. For further documentation on the React API that is shared between React Native and React DOM, refer to the React documentation.
The source for the React Native documentation and website is hosted on a separate repo, @facebook/react-native-website.
🚀 Upgrading
Upgrading to new versions of React Native may give you access to more APIs, views, developer tools, and other goodies. See the Upgrading Guide for instructions.
React Native releases are discussed in the React Native Community, @react-native-community/react-native-releases.
👏 How to Contribute
The main purpose of this repository is to continue evolving React Native core. We want to make contributing to this project as easy and transparent as possible, and we are grateful to the community for contributing bug fixes and improvements. Read below to learn how you can take part in improving React Native.
Code of Conduct
Facebook has adopted a Code of Conduct that we expect project participants to adhere to. Please read the full text so that you can understand what actions will and will not be tolerated.
Contributing Guide
Read our Contributing Guide to learn about our development process, how to propose bugfixes and improvements, and how to build and test your changes to React Native.
Open Source Roadmap
You can learn more about our vision for React Native in the Roadmap.
Good First Issues
We have a list of good first issues that contain bugs which have a relatively limited scope. This is a great place to get started, gain experience, and get familiar with our contribution process.
Discussions
Larger discussions and proposals are discussed in @react-native-community/discussions-and-proposals.
📄 License
React Native is MIT licensed, as found in the LICENSE file.
React Native documentation is Creative Commons licensed, as found in the LICENSE-docs file.