Merge pull request #3 from rtCamp/add/env-var-check

Add missing secret error handling

entrypoint.sh

@@ -1,5 +1,23 @@
 #!/usr/bin/env bash
 
+# Check required env variables
+flag=0
+if [[ -z "$SLACK_WEBHOOK" ]]; then
+    flag=1
+    missing_secret="SLACK_WEBHOOK"
+    if [[ -n "$VAULT_ADDR" ]] && [[ -n "$VAULT_TOKEN" ]]; then
+        flag=0
+    fi
+    if [[ -n "$VAULT_ADDR" ]] || [[ -n "$VAULT_TOKEN" ]]; then
+        missing_secret="VAULT_ADDR and/or VAULT_TOKEN"
+    fi
+fi
+
+if [[ "$flag" -eq 1 ]]; then
+    printf "[\e[0;31mERROR\e[0m] Secret \`$missing_secret\` is missing. Please add it to this action for proper execution.\nRefer https://github.com/rtCamp/action-slack-notify for more information.\n"
+    exit 1
+fi
+
 # custom path for files to override default files
 custom_path="$GITHUB_WORKSPACE/.github/slack"
 main_script="/main.sh"
@@ -9,4 +27,4 @@ if [[ -d "$custom_path" ]]; then
     chmod +x /*.sh
 fi
 
-bash "$main_script"
+bash "$main_script"