Update documentation

docs/api-documents.md

@@ -13,14 +13,152 @@
 1. To request an API Key, simply login to your WGDashboard, go to **Settings**, scroll to the very bottom. Click the **switch** on the right to enable API Key.
 2. Click the blur **Create** button, set an **expiry date** you want or **never expire**, then click **Done**.
 
-### Use API Key in `fetch()`
+### Use API Key
+
+- Simply add `wg-dashboard-apikey` with the value of your API key into the HTTP Header.
 
 ```javascript
-fetch('http://server:10086', {
+fetch('http://server:10086/api/handshake', {
     headers: {
        'content-type': 'application/json',
         'wg-dashboard-apikey': 'insert your api key here'
-    }
+    },
+    method: "GET"
 })
 ```
-To use API Key, simply insert `wg-dashboard-apikey` with the value of your API key into the `header` in your http request.
+
+## API Endpoints
+
+### Handshake to Server
+
+This endpoint is designed for a simple handshake when using API key to connect. If `status` is `true` that means 
+
+#### Request
+
+`GET /api/handshake`
+
+#### Response
+
+`200 - OK`
+
+```json
+{
+    "data": null,
+    "message": null,
+    "status": true
+}
+```
+
+`401 - UNAUTHORIZED`
+
+```json
+{
+    "data": null,
+    "message": "Unauthorized access.",
+    "status": false
+}
+```
+> Notice: this `401` response will return at all endpoint if your API Key or session is invalid.
+
+### Validate Authentication
+
+This endpoint if needed for non-cross-server access. This will check if the cookie on the client side is still valid on the server side.
+
+#### Request
+
+`GET /api/validateAuthentication`
+
+#### Response
+
+`200 - OK`
+
+Session is still valid
+
+```json
+{
+    "data": null,
+    "message": null,
+    "status": true
+}
+```
+
+Session is invalid
+
+```json
+{
+    "data": null,
+    "message": "Invalid authentication.",
+    "status": false
+}
+```
+
+### Authenticate
+
+This endpoint is dedicated for non-cross-server access. It is used to authenticate user's username, password and TOTP 
+
+#### Request
+
+`POST /api/authenticate`
+
+##### Body Parameters
+
+```json
+{
+    "username": "admin",
+    "password": "admin",
+    "totp": "123456"
+}
+```
+
+**`username`** string
+
+**`password`** string
+
+**`totp`** string
+
+#### Response
+
+`200 - OK`
+
+If username, password and TOTP matched
+
+```json
+{
+    "data": null,
+    "message": null,
+    "status": true
+}
+```
+
+If username, password or TOTP is not match
+
+```json
+{
+    "data": null,
+    "message": "Sorry, your username, password or OTP is incorrect.",
+    "status": false
+}
+```
+
+
+
+
+
+=============
+
+### Endpoint
+
+Description
+
+#### Request
+
+`GET`
+
+#### Response
+
+`200 - OK`
+
+```json
+
+```
+