Add support for bearer auth

README.md

@@ -2,7 +2,10 @@
 
 ## Setup
 
-### Environment
+The following credentials type are supported: Basic Auth (password of the admin
+account) or Bearer Auth.
+
+### Password with Environment variable
 
 Specify the admin password by running the following two commands
 
@@ -19,7 +22,7 @@ export API_HOST=https://hawkbit.example.com
 
 Remember that you will have to reenter your password whenever you switch `API_HOST`
 
-### netrc
+### Password with .netrc
 
 You can also configure your credentials with the help of `~/.netrc` (see
 `curl(1) --netrc` for more information)
@@ -32,6 +35,23 @@ Also remember to set the permissions correctly:
 
     chmod 600 ~/.netrc
 
+### Bearer Authentication
+
+Get an access_token from an OAUTH2 server plugged to the Hawkbit one.
+
+```
+export BEARER_TOKEN
+BEARER_TOKEN=$(curl \
+                -d "client_id=$OAUTH_CLIENT_ID" \
+                -d "client_secret=$OAUTH_CLIENT_SECRET" \
+                -d "grant_type=client_credentials" \
+                $OAUTH_URL \
+               | jq --exit-status --raw-output .access_token)
+```
+
+Remember that access tokens could have a short lifetime (several minutes).
+Check `expires_in` field of the response.
+
 ## Usage
 
 ```

src/config.sh

@@ -9,6 +9,8 @@ fi
 if [ -n "$PASSWORD" ]; then
     # shellcheck disable=SC2034
     CURL_AUTH_ARGS=(--user "admin:$PASSWORD")
+elif [ -n "$BEARER_TOKEN" ]; then
+    CURL_AUTH_ARGS=(-H "Authorization: Bearer $BEARER_TOKEN")
 elif [ -f ~/.netrc ] && grep --quiet "${API_HOST##*://}" ~/.netrc; then
     # shellcheck disable=SC2034
     CURL_AUTH_ARGS=(--netrc)