support AWS environment variables

README.md

@@ -49,6 +49,8 @@ mbtiles-extractor --input=some.mbtiles --outputType=local --localOutDir=Data --t
 
 `--force=false` Force replace any existing files without asking.
 
+An optional `AWS_S3_ENDPOINT` environment variable may be provided, which is mainly used for S3 compatiable services. eg. `export AWS_S3_ENDPOINT=https://sgp1.digitaloceanspaces.com` if using Digital Ocean Spaces.
+
 #### Local storage options
 
 `--localOutDir` **Required** The name of a folder to place the tiles in.

src/main.js

@@ -230,6 +230,9 @@ export async function cli () {
                 agent: defaultAgent
             }
         }
+        if (process.env.AWS_S3_ENDPOINT) {
+            awsOptions.endpoint = new AWS.Endpoint(process.env.AWS_S3_ENDPOINT)
+        }
         if (options.awsProfile) {
             const profile = await adoptProfile()
             Object.assign(awsOptions, profile);