implement

src/main.ts

@@ -18,20 +18,17 @@ function main(): void
 	try
 	{
 		// parameters
+		const noKnownHosts = string2boolean(core.getInput("no_known_hosts"));
 		const key = core.getInput("key", {
 			required: true,
 		});
 		const name = core.getInput("name");
 		const knownHosts = core.getInput("known_hosts", {
-			required: true,
+			required: !noKnownHosts, // optional if no_known_hosts is true
 		});
 		const config = core.getInput("config");
 		const ifKeyExists = core.getInput("if_key_exists");
 
-		// test
-		const noKnownHosts = core.getInput("no_known_hosts");
-		console.log(noKnownHosts);
-
 		// create ".ssh" directory
 		const home = getHomeDirectory();
 		const dirName = path.resolve(home, ".ssh");
@@ -86,6 +83,33 @@ function main(): void
 	}
 }
 
+/**
+ * convert string to boolean
+ * @param value string value
+ * @returns boolean value
+ */
+function string2boolean(value: string): boolean
+{
+	// true if "true" / "yes" / "on"
+	switch(value.trim().toLowerCase())
+	{
+	case "true":
+	case "yes":
+	case "on":
+		return true;
+	}
+
+	// true if number and non-zero
+	const numberValue = Number(value);
+	if(!isNaN(numberValue) && numberValue !== 0)
+	{
+		return true;
+	}
+
+	// false otherwise
+	return false;
+}
+
 /**
  * get home directory
  * @returns home directory