feat: create first version of identification national id lambda (#1)

Author: g-otn

.gitignore

@@ -32,3 +32,134 @@ override.tf.json
 # Ignore CLI configuration files
 .terraformrc
 terraform.rc
+
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index.js

@@ -0,0 +1,65 @@
+const jwt = require("jsonwebtoken");
+
+// Constants.
+const JWT_PRIVATE_KEY = process.env.JWT_PRIVATE_KEY;
+const JWT_EXPIRATION_TIME = "1h";
+
+exports.handler = async (event) => {
+  try {
+    // Gets event body.
+    const body =
+      typeof event.body === "string" ? JSON.parse(event.body) : event.body;
+
+    // Client will be identified by national id.
+    const nationalId = body.nationalId;
+
+    if (!nationalId) {
+      return {
+        statusCode: 400,
+      };
+    }
+  } catch (error) {
+    return {
+      statusCode: 400,
+    };
+  }
+
+  ////////////////////////////////////////////////////////////////////////
+
+  // TODO gets client by national id, creates it if no national id matches.
+
+  ////////////////////////////////////////////////////////////////////////
+
+  // TODO pass client id to 'sub' instead of using this '1111111111' hardcoded value.
+  // Object that stores values used by 'jsonwebtoken - sign' function call.
+  // Sub represents the client ID.
+  const jwtSettings = {
+    privateKey: JWT_PRIVATE_KEY,
+    payload: {
+      sub: 1111111111,
+    },
+    options: {
+      expiresIn: JWT_EXPIRATION_TIME,
+      algorithm: "RS256",
+    },
+  };
+
+  try {
+    const token = jwt.sign(
+      jwtSettings.payload,
+      jwtSettings.privateKey,
+      jwtSettings.options
+    );
+
+    return {
+      headers: { "content-type": "application/json" },
+      statusCode: 200,
+      body: JSON.stringify({ token }),
+    };
+  } catch (error) {
+    return {
+      statusCode: 500,
+      body: "asd " + error,
+    };
+  }
+};