## File structure

Let's say you have a directory named `my_super_project` that contains a sub-directory called `sql_app` with a structure like this:

```
.
└── sql_app
    ├── __init__.py
    ├── crud.py
    ├── database.py
    ├── main.py
    └── schemas.py
```

This is almost the same structure as we had for the SQLAlchemy tutorial.

Now let's see what each file/module does.

        if (firSymbol is FirErrorPropertySymbol && firSymbol.diagnostic is ConeDestructuringDeclarationsOnTopLevel) {
            return null
        }

        getContainingDeclarationForDependentDeclaration(symbol)?.let { return it }

        if (symbolModule is KtDanglingFileModule && symbolModule.resolutionMode == DanglingFileResolutionMode.IGNORE_SELF) {
            if (hasParentPsi(symbol)) {

* **Irọrun**: A kọ kí ó le rọrun láti lo àti láti kọ ẹkọ nínú rè. Ó máa fún ọ ní àkókò díẹ̀ látı ka àkọsílẹ.
* **Ó kúkurú ní kikọ**: Ó dín àtúnkọ àti àtúntò kóòdù kù. Ìkéde àṣàyàn kọ̀ọ̀kan nínú rẹ̀ ní ọ̀pọ̀lọpọ̀ àwọn ìlò. O ṣe iranlọwọ láti má ṣe ní ọ̀pọ̀lọpọ̀ àṣìṣe.

# Simple OAuth2 with Password and Bearer

Now let's build from the previous chapter and add the missing parts to have a complete security flow.

## Get the `username` and `password`

We are going to use **FastAPI** security utilities to get the `username` and `password`.

OAuth2 specifies that when using the "password flow" (that we are using) the client/user must send a `username` and `password` fields as form data.

Let's see that phrase by parts in the sections below:

* **Asynchronous Code**
* **`async` and `await`**
* **Coroutines**

## Asynchronous Code

Asynchronous code just means that the language 💬 has a way to tell the computer / program 🤖 that at some point in the code, it 🤖 will have to wait for *something else* to finish somewhere else. Let's say that *something else* is called "slow-file" 📝.

* Traefik（証明書の更新も対応）
* Caddy (証明書の更新も対応)
* Nginx
* HAProxy


## Let's Encrypt

Let's Encrypt以前は、これらの**HTTPS証明書**は信頼できる第三者によって販売されていました。

これらの証明書を取得するための手続きは面倒で、かなりの書類を必要とし、証明書はかなり高価なものでした。

しかしその後、**<a href="https://letsencrypt.org/" class="external-link" target="_blank">Let's Encrypt</a>** が作られました。

            val keyType = type.arguments.getOrNull(0)?.type
            val valueType = type.arguments.getOrNull(1)?.type

            val keyConversion = keyType?.let { createConversion(it) } ?: HLIdParameterConversion
            val valueConversion = valueType?.let { createConversion(it) } ?: HLIdParameterConversion
            if (keyConversion.isTrivial && valueConversion.isTrivial) return HLIdParameterConversion

You can create your own custom response class, inheriting from `Response` and using it.

For example, let's say that you want to use <a href="https://github.com/ijl/orjson" class="external-link" target="_blank">`orjson`</a>, but with some custom settings not used in the included `ORJSONResponse` class.

Let's say you want it to return indented and formatted JSON, so you want to use the orjson option `orjson.OPT_INDENT_2`.

    It doesn't matter if it has other characters like `:` or if it is a URL.

    Those details are implementation specific.

    For OAuth2 they are just strings.

## Global view

* Интеграция с Traefik включает автоматическую генерацию сертификатов Let's Encrypt для поддержки протокола **HTTPS**.
* GitLab **CI** (непрерывная интеграция), которая включает тестирование фронтенда и бэкенда.

## Full Stack FastAPI Couchbase