User: how do I store images from my expo app into an s3 bucket?
Assistant: To upload images from your Expo app to an Amazon S3 bucket, you'll typically follow these steps:

1. **Set Up Your S3 Bucket:**
   - Create an S3 bucket in your AWS account.
   - Set proper permissions for the bucket. You can use an IAM role or user credentials to manage access.
   - Optionally configure CORS for your bucket if you're accessing it directly from your app.

2. **Install Dependencies in Your Expo App:**
   You will need a library to handle image uploads and the AWS SDK. If you haven't already, install the necessary packages:
   ```bash
   expo install expo-image-picker
   npm install aws-sdk
   ```

3. **Pick an Image:**
   Use `expo-image-picker` to allow users to choose an image from their device.

4. **Upload the Image to S3:**
   Use the AWS SDK to upload the selected image to your S3 bucket.

5. **Example Code:**
   Below is a simplified example of how you can implement this in your Expo app:

```javascript
import React, { useState } from 'react';
import { View, Button, Image } from 'react-native';
import * as ImagePicker from 'expo-image-picker';
import AWS from 'aws-sdk/dist/aws-sdk-react-native';

AWS.config.update({
  accessKeyId: "<YOUR_AWS_ACCESS_KEY>",
  secretAccessKey: "<YOUR_AWS_SECRET_KEY>",
  region: "<YOUR_AWS_REGION>"
});

const s3 = new AWS.S3({
  /* other options */
});

const MyApp = () => {
  const [image, setImage] = useState(null);

  const pickImage = async () => {
    let result = await ImagePicker.launchImageLibraryAsync({
      mediaTypes: ImagePicker.MediaTypeOptions.All,
      allowsEditing: true,
      aspect: [4, 3],
      quality: 1,
    });

    if (!result.cancelled) {
      setImage(result.uri);
      uploadImage(result.uri);
    }
  };

  const uploadImage = async (uri) => {
    // Convert the image to base64 or get the blob
    const response = await fetch(uri);
    const blob = await response.blob();

    const params = {
      Bucket: "<YOUR_BUCKET_NAME>",
      Key: `images/${Date.now()}.jpg`, // Rename based on your needs
      Body: blob,
      ContentType: 'image/jpeg', // Adjust based on image type
      ACL: 'public-read', // Adjust permissions as needed
    };

    s3.upload(params, (err, data) => {
      if (err) {
        console.error('Error uploading image: ', err);
      } else {
        console.log('Successfully uploaded image', data);
      }
    });
  };

  return (
    <View>
      <Button title="Pick an image" onPress={pickImage} />
      {image && <Image source={{ uri: image }} style={{ width: 200, height: 200 }} />}
    </View>
  );
};

export default MyApp;
```

### Important Notes:

1. **AWS Credentials Security:** Do not hardcode your AWS credentials in your app. Instead, consider using AWS Cognito for authentication and temporary credentials.

2. **CORS Configuration:** Ensure that the CORS policy of your S3 bucket allows requests from your app.

3. **IAM Policy:** Make sure your IAM user/role has permissions to upload files to the S3 bucket.

4. **Keep SDK Size Down:** Depending on your needs, consider a lighter alternative or bundling strategy for the AWS SDK.

5. **Expo Managed vs. Bare Workflow:** This example assumes you are using the Expo managed workflow. If you are using the bare workflow, additional setup may be necessary.

By following these steps and using the provided code, you should be able to upload images from your Expo app to an S3 bucket successfully.
User: will this be a public url?
Assistant: