Updated Amazon S3 API (markdown)

Amazon-S3-API.md

@@ -79,9 +79,38 @@ By default, `weed s3` will automatically remove empty folders, to be consistent
 You can use `weed s3 -allowEmptyFolder` to toggle this behavior.
 
 # Authentication
-By default, the access key and secret key to access `weed s3` is not authenticated. To enable credential based access, create a config.json file similar to the example below, and specify it via `weed s3 -config=config.json`.
+By default, the access key and secret key to access `weed s3` is not authenticated. To enable credential based access, you can choose static or dynamic configuration:
+* **Dynamic Configuration**: setup auth with `s3.configure` in `weed shell`
+* **Static Configuration**: create a config.json file similar to the example below, and specify it via `weed s3 -config=config.json`
 
-## Configuration Example
+## Dynamic Configuration
+```
+> s3.configure -access_key=any -secret_key=any -buckets=bucket1 -user=me -actions=Read,Write,List,Tagging,Admin -apply
+{
+  "identities": [
+    {
+      "name": "me",
+      "credentials": [
+        {
+          "accessKey": "any",
+          "secretKey": "any"
+        }
+      ],
+      "actions": [
+        "Read:bucket1",
+        "Write:bucket1",
+        "List:bucket1",
+        "Tagging:bucket1",
+        "Admin:bucket1"
+      ]
+    }
+  ]
+}
+```
+
+## Static Configuration
+
+To enable credential based access, create a config.json file similar to the example below, and specify it via `weed s3 -config=config.json`.
 
 You just need to create a user with all "Admin", "Read", "Write", "List", "Tagging" actions.
 You can create as many users as needed. Each user can have multiple credentials.