Use secrets that can be overridden

Author: ptman

README.md

@@ -7,17 +7,13 @@ Usage:
 ```yaml
   matrix:
     image: ptman/drone-plugin-matrix
-    homeserver: https://matrix.org
+    homeserver: https://matrix.org          # defaults to https://matrix.org
     roomid: '!0123456789abcdef:matrix.org'  # room has to already be joined
-    username: ourbot                        # either username
-    password: *account-password*            # and password
-    userid: @ourbot:matrix.org              # or userid
-    accesstoken: 0123456789abcdef           # and accesstoken
-    secrets:                                # and a better idea
-      - source: matrix_username             # is to not store
-        target: plugin_username             # credentials in the git repo
-      - source: matrix_password             # but instead use drone
-        target: plugin_password             # secret management
+    secrets:
+      - matrix_username     # either username  ('ourbot')
+      - matrix_password     # and password     ('*ourbot-password*')
+    # - matrix_userid       # or userid        ('@ourbot:matrix.org')
+    # - matrix_accesstoken  # and access token ('long string of characters')
 ```
 
 ## License

main.go

@@ -11,13 +11,33 @@ import (
 )
 
 func main() {
-	homeServer := os.Getenv("PLUGIN_HOMESERVER")
-	userName := os.Getenv("PLUGIN_USERNAME")
-	password := os.Getenv("PLUGIN_PASSWORD")
+	// Secrets
+	password := os.Getenv("MATRIX_PASSWORD")
+	accessToken := os.Getenv("MATRIX_ACCESSTOKEN")
+	// Not sure if these are secrets or nice to have close to them
+	userName := os.Getenv("MATRIX_USERNAME")
+	userID := os.Getenv("MATRIX_USERID")
+
+	// Override secrets if present
+	if pw := os.Getenv("PLUGIN_PASSWORD"); pw != "" {
+		password = pw
+	}
+	if at := os.Getenv("PLUGIN_ACCESSTOKEN"); at != "" {
+		accessToken = at
+	}
+	if un := os.Getenv("PLUGIN_USERNAME"); un != "" {
+		userName = un
+	}
+	if ui := os.Getenv("PLUGIN_USERID"); ui != "" {
+		userID = ui
+	}
 
-	userID := os.Getenv("PLUGIN_USERID")
-	accessToken := os.Getenv("PLUGIN_ACCESSTOKEN")
+	homeServer := os.Getenv("PLUGIN_HOMESERVER")
+	if homeServer == "" {
+		homeServer = "https://matrix.org"
+	}
 
+	// TODO: resolve room aliases
 	roomID := os.Getenv("PLUGIN_ROOMID")
 	message := os.Getenv("PLUGIN_MESSAGE")