From fda6aaf410000312998ce67fcdc9d4ddf84689c5 Mon Sep 17 00:00:00 2001
From: Thiago Bezerra <thiago.bezerra@present-technologies.com>
Date: Sun, 5 Nov 2023 19:12:31 -0300
Subject: [PATCH] feat: first version of identification endpoint call

---
 index.js | 86 +++++++++++++++++++++++++++++---------------------------
 1 file changed, 45 insertions(+), 41 deletions(-)

diff --git a/index.js b/index.js
index 9b90b8b..3561246 100644
--- a/index.js
+++ b/index.js
@@ -2,69 +2,73 @@ const jwt = require("jsonwebtoken");
 
 // JWT constants.
 const JWT_PRIVATE_KEY = process.env.JWT_PRIVATE_KEY;
-const JWT_EXPIRATION_TIME_IN_HOURS = "1h";
-const JWT_RS256_ALGORITHM = "RS256";
 
 // HTTP constants.
 const HTTP_SUCCESS_STATUS_CODE = 200;
 const HTTP_BAD_REQUEST_STATUS_CODE = 400;
 const HTTP_INTERNAL_SERVER_ERROR_STATUS_CODE = 500;
-const HTTP_HEADER_CONTENT_TYPE_KEY = "content-type";
-const HTTP_HEADER_JSON_CONTENT_TYPE = "application/json";
 
-// General constants.
-const STRING_TYPE = "string";
+// Endpoints.
+const HOST = "";
+const CLIENTS_IDENTIFICATION_URL = `${HOST}/clients/identification`;
 
-exports.handler = async (event) => {
+// Params.
+const NATIONAL_ID_QUERY_PARAMETER = "nationalId";
+
+const parseEventBody = (body) => {
   try {
-    // Gets event body.
-    const body =
-      typeof event.body === STRING_TYPE ? JSON.parse(event.body) : event.body;
+    return typeof body === "string" ? JSON.parse(body) : body;
+  } catch (error) {
+    return null;
+  }
+};
 
-    // Client will be identified by national id.
-    const nationalId = body.nationalId;
+const getNationalIdFromEvent = (event) => {
+  const body = parseEventBody(event.body);
 
-    if (!nationalId) {
-      return {
-        statusCode: HTTP_BAD_REQUEST_STATUS_CODE,
-      };
+  return body?.nationalId;
+};
+
+const getClientIdByNationalId = async (nationalId) => {
+  const response = await fetch(
+    `${CLIENTS_IDENTIFICATION_URL}?${NATIONAL_ID_QUERY_PARAMETER}=${nationalId}`,
+    {
+      method: "POST",
+      headers: {
+        "content-type": "application/json",
+      },
     }
-  } catch (error) {
+  );
+
+  return response?.data?.id;
+};
+
+exports.handler = async (event) => {
+  const nationalId = getNationalIdFromEvent(event);
+
+  if (!nationalId) {
     return {
       statusCode: HTTP_BAD_REQUEST_STATUS_CODE,
     };
   }
 
-  ////////////////////////////////////////////////////////////////////////
-
-  // 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_IN_HOURS,
-      algorithm: JWT_RS256_ALGORITHM,
-    },
-  };
-
   try {
+    const clientId = await getClientIdByNationalId(nationalId);
+
     const token = jwt.sign(
-      jwtSettings.payload,
-      jwtSettings.privateKey,
-      jwtSettings.options
+      {
+        sub: clientId,
+      },
+      JWT_PRIVATE_KEY,
+      {
+        expiresIn: "1h",
+        algorithm: "RS256",
+      }
     );
 
     return {
       headers: {
-        [HTTP_HEADER_CONTENT_TYPE_KEY]: HTTP_HEADER_JSON_CONTENT_TYPE,
+        "content-type": "application/json",
       },
       statusCode: HTTP_SUCCESS_STATUS_CODE,
       body: JSON.stringify({ token }),