* first action! (#1)

src/main.ts

@@ -0,0 +1,53 @@
+import * as fs from "fs";
+import * as path from 'path';
+
+import * as core from '@actions/core';
+
+function main(): void
+{
+    try
+    {
+        const home = getHomeDirectory();
+        const dirName = path.resolve(home, ".ssh");
+        fs.mkdirSync(dirName, {
+            recursive: true,
+            mode: 0o700,
+        });
+
+        const privateKey = core.getInput('private-key') as string;
+        const publicKey = core.getInput('public-key') as string;
+        const name = core.getInput('name') as string;
+
+        const fileName = path.resolve(dirName, name);
+        fs.writeFileSync(fileName, privateKey, {
+            mode: 0o400,
+        });
+        fs.writeFileSync(`${fileName}.pub`, publicKey, {
+            mode: 0o444,
+        });
+
+        console.log(`SSH key has been stored to ${fileName} successfully.`);
+    }
+    catch(err)
+    {
+        core.setFailed(err.message);
+    }
+}
+
+/**
+ * get home directory
+ * @returns home directory
+ */
+function getHomeDirectory(): string
+{
+    const home_env = process.platform == "win32" ? "USERPROFILE" : "HOME";
+    const home = process.env[home_env];
+    if(home === undefined)
+    {
+        throw new Error(`${home_env} is not defined`);
+    }
+
+    return home;
+}
+
+main();