Allow the AWS SDK to get auth from the environment (fixes #28)

docs/content/2.storage-drivers/s3.md

@@ -62,12 +62,7 @@ services:
 
       STORAGE_DRIVER: s3
       STORAGE_S3_BUCKET: gh-actions-cache
-      STORAGE_S3_ACCESS_KEY: access_key
-      STORAGE_S3_SECRET_KEY: secret_key
 
-      STORAGE_S3_ENDPOINT: s3.amazonaws.com
-      STORAGE_S3_PORT: '443'
-      STORAGE_S3_USE_SSL: 'true'
     volumes:
       - cache-data:/app/.data
 
@@ -79,36 +74,20 @@ volumes:
 
 Don't forget to set the `STORAGE_DRIVER` environment variable to `s3` to use the S3 storage driver.
 
+The AWS SDK will automatically use any AWS credentials available in the environment, e.g. `AWS_ACCESS_KEY_ID`, `AWS_SECRET_ACCESS_KEY` and `AWS_REGION`.
+
 #### `STORAGE_S3_BUCKET`
 
 Example: `gh-actions-cache`
 
 The name of the S3 bucket used for storage.
 
-#### `STORAGE_S3_ACCESS_KEY`
-
-Example: `access_key`
-
-The access key for S3 storage.
-
-#### `STORAGE_S3_SECRET_KEY`
-
-Example: `secret_key`
-
-The secret key for S3 storage.
-
 #### `STORAGE_S3_ENDPOINT`
 
 Example: `s3.amazonaws.com`, `minio`
 
 The endpoint hostname for S3 storage.
 
-#### `STORAGE_S3_REGION`
-
-Example: `us-west-1`
-
-The region for AWS S3. Not needed with MinIO.
-
 #### `STORAGE_S3_PORT`
 
 Example: `443`, `9000`

lib/storage/drivers/s3.ts

@@ -17,24 +17,36 @@ import { streamToBuffer } from '~/lib/utils'
 export const s3Driver = defineStorageDriver({
   envSchema: z.object({
     STORAGE_S3_BUCKET: z.string().min(1),
-    STORAGE_S3_ENDPOINT: z.string().min(1),
+    STORAGE_S3_ENDPOINT: z.string().optional(),
     STORAGE_S3_REGION: z.string().min(1).default('us-east-1'),
-    STORAGE_S3_PORT: z.coerce.number().positive(),
-    STORAGE_S3_USE_SSL: z.string().transform((v) => v === 'true'),
-    STORAGE_S3_ACCESS_KEY: z.string().min(1),
-    STORAGE_S3_SECRET_KEY: z.string().min(1),
+    STORAGE_S3_PORT: z.coerce.number().positive().optional(),
+    STORAGE_S3_USE_SSL: z
+      .string()
+      .transform((v) => v === 'true')
+      .optional(),
+    STORAGE_S3_ACCESS_KEY: z.string().optional(),
+    STORAGE_S3_SECRET_KEY: z.string().optional(),
+    AWS_REGION: z.string().optional(),
+    AWS_DEFAULT_REGION: z.string().optional(),
   }),
   async setup(options) {
     const protocol = options.STORAGE_S3_USE_SSL ? 'https' : 'http'
     const port = options.STORAGE_S3_PORT ? `:${options.STORAGE_S3_PORT}` : ''
+    let credentials
 
-    const s3 = new S3Client({
-      credentials: {
+    if (options.STORAGE_S3_ACCESS_KEY && options.STORAGE_S3_SECRET_KEY) {
+      credentials = {
         secretAccessKey: options.STORAGE_S3_SECRET_KEY,
         accessKeyId: options.STORAGE_S3_ACCESS_KEY,
-      },
-      endpoint: `${protocol}://${options.STORAGE_S3_ENDPOINT}${port}`,
-      region: options.STORAGE_S3_REGION,
+      }
+    }
+
+    const s3 = new S3Client({
+      credentials,
+      endpoint: options.STORAGE_S3_ENDPOINT
+        ? `${protocol}://${options.STORAGE_S3_ENDPOINT}${port}`
+        : undefined,
+      region: options.AWS_REGION ?? options.AWS_DEFAULT_REGION ?? options.STORAGE_S3_REGION,
       forcePathStyle: true,
     })