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Guide - Setup HackMD S3 image upload

Go to AWS S3 console and create a new bucket.
Click on bucket, select Properties on the side panel, and find Permission section. Click Edit bucket policy.

Enter the following policy, replace bucket_name with your bucket name:

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Principal": "*",
            "Action": "s3:GetObject",
            "Resource": "arn:aws:s3:::bucket_name/uploads/*"
        }
    ]
}

Go to IAM console and create a new IAM user. Remember your user credentials(key/access token)
Enter user page, select Permission tab, look at Inline Policies section, and click Create User Policy
Select Custom Policy

Enter the following policy, replace bucket_name with your bucket name:

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "s3:*"
            ],
            "Resource": [
                "arn:aws:s3:::bucket_name/uploads/*"
            ]
        }
    ]
}

Edit config.json and set following keys:

{
    "production": {
        ...
        "imageUploadType": "s3",
        "s3": {
            "accessKeyId": "YOUR_S3_ACCESS_KEY_ID",
            "secretAccessKey": "YOUR_S3_ACCESS_KEY",
            "region": "YOUR_S3_REGION", // example: ap-northeast-1
            "bucket": "YOUR_S3_BUCKET_NAME"
        }
    }
}

In additional to edit config.json directly, you could also try environment variable.

AWS Policy Generator