# | aicra |
[](https://golang.org/doc/go1.10)
[](https://opensource.org/licenses/MIT)
[](https://goreportcard.com/report/git.xdrm.io/go/aicra)
[](https://godoc.org/git.xdrm.io/go/aicra)
**Aicra** is a self-working framework coded in *Go* that allows anyone to create a fully featured REST API. It features type checking, authentication management through middlewares, file upload, rich argument parsing (*i.e. url slash-separated, urlencoded, form-data, json*), nested routes, project compiler (*i.e. aicra*), etc.
All the REST API management is done for you, you just need to implement :
- the controllers
- the middlewares (to manage authentication, csrf, etc)
- the type checkers to check if input arguments follows some rules
There is 2 drivers that lets you implement these features in Go or whatever language.
This framework is based over some of the following concepts.
| concept | explanation |
|---|---|
| meaningful defaults | Defaults and default values work without further understanding |
| configuration driven | Avoid information duplication. Automate anything that can be automated without losing control. Have *one* configuration that summarizes the whole project, its behavior and its automation flow. |
> A working example is available [here](https://git.xdrm.io/example/aicra)
#### Table of contents
- [I. Installation](#i-installation)
* [1. Download and install the package](#1-download-and-install-the-package)
- [II. Setup a project](#ii-setup-a-project)
* [1. Configuration](#1-configuration)
* [2. Controllers](#2-controllers)
* [3. Middlewares](#3-middlewares)
* [4. Custom types](#4-custom-types)
- [III. Build your project](#iii-build-your-project)
- [IV. Main](#iv-main)
- [V. Change Log](#v-change-log)
#### I. Installation
You need a recent machine with `go` [installed](https://golang.org/doc/install).
> This package has not been tested under the version **1.10**.
##### 1. Download and install the package
```bash
go get -u git.xdrm.io/go/aicra/cmd/aicra
```
The library should now be available locally and available for your imports. Moreover, the **project compilet** have been installed as the `aicra` command.
> The executable `aicra` will be placed into your `$GOPATH/bin` folder, if added to your environment PATH it should be available as a standalone command in your terminal. If not, you can simply run `$GOPATH/bin/aicra` to use the command or create a symlink into `/usr/local/bin` for instance.
#### II. Setup a project
The default project structure for **aicra** is as follows :
```
├── main.go - entry point
|
├── aicra.json - server configuration file
├── api.json - API configuration file
|
├── middleware - middleware implementations
├── controller - controller implementations
└── type - custom type checkers
```
##### 1. Compilation configuration
The `aicra.json` configuration file defines where are located your controllers, type checkers, and middlewares ; also it contains what driver you want to use, you have 2 choices :
1. **plugin** - for Go implementations
2. **generic** - for any language implementation (uses standard input and output)
| field | description | example value |
| ------------------ | ------------------------------------------------------------ | -------------------- |
| root | The project folder path | `./some-path` |
| driver | The driver to use for loading controllers, middlewares and type checkers | `plugin` or`generic` |
| types.default | Whether to load default types into the project | `true`, `false` |
| types.folder | The folder (relative to the project root) where type checkers' implementations are located | `./type` |
| controllers.folder | The folder (relative to the project root) where controllers' implementations are located | `./controller` |
| middlewares.folder | The folder (relative to the project root) where middlewares' implementations are located | `./middleware` |
A sample file can be found [here](https://git.xdrm.io/example/aicra/src/master/aicra.json).
##### 2. API Configuration
The whole project behavior is described inside the `api.json` file. For a better understanding of the format, take a look at this working [template](https://git.xdrm.io/example/aicra/src/master/api.json). This file defines :
- resource routes and their methods
- every input for each method (called *argument*)
- every output for each method
- scope permissions (list of permissions you can compose)
- input policy :
- type of argument
- required/optional
- default value
- variable renaming
##### 3. Controllers
Controllers implement `Get`, `Post`, `Put`, and `Delete` methods, and have access to special variables surrounded by underscores :
- `_HTTP_METHOD_` the request's HTTP method in uppercase
- `_SCOPE_` the scope filled by middlewares
- `_AUTHORIZATION_` the request's **Authorization** header
Also special variables found in the return data are processed with special actions :
- `_REDIRECT_` will redirect to the URL contained in the variable
###### Plugin driver
For each route, you'll have to place your implementation into the `controller` folder (according to the *aicra.json* configuration) following the naming convention : add `/main.go` at the end of the route.
> Example - `/path/to/some/uri` will be inside `controller/path/to/some/uri/main.go`
> Exception - `/` will be inside `controller/ROOT/main.go`
A sample directory structure is available [here](https://git.xdrm.io/example/aicra/src/master/controller.plugin).
Each controller must implement the `git.xdrm.io/go/aicra/driver.Controller` interface. In addition you must declare the function `func Export() Controller` to allow dynamic loading of your controller.
###### Generic driver
This is the same as with the plugin driver but instead of without `/main.go` at the end.
> Example - `/path/to/some/uri` will be inside `controller/path/to/some/uri` where the **uri** file is an executable.
> Exception - `/` will be inside `controller/ROOT`.
A sample directory structure is available [here](https://git.xdrm.io/example/aicra/src/master/controller.generic).
##### 4. Middlewares
In order for your project to manage authentication, the best solution is to create middlewares, there are programs that updates a *Scope* (*i.e. a list of strings*) according to internal or persistent (*i.e.* database) information and the actual http request. They are all run before each request is forwarded to your controller. The scope are used to match the `scope` field in the configuration file and automatically block non-authenticated requests. Scopes can also be used for implementation-specific behavior such as _CSRF_ management. Controllers have access to the scope through the variable `_SCOPE_`.
###### Plugin driver
Each middleware must be **directly** inside the `middleware` folder (according to the _aicra.json_ configuration).
> Example - the `1-authentication` middleware will be inside `middleware/1-authentication/main.go`.
**Note** - middleware execution will be ordered by name. Prefixing your middlewares with their order is a good practice.
A sample directory structure is available [here](https://git.xdrm.io/example/aicra/src/master/middleware.plugin).
Each middleware must implement the `git.xdrm.io/go/aicra/driver.Middleware` interface. In addition you must declare the function `func Export() Middleware` to allow dynamic loading of your middleware.
###### Generic driver
This is the same as with the plugin driver but instead of without `/main.go` at the end.
> Example - the `1-authentication` middleware will be inside `middleware/1-authentication` where **1-authentication** is an executable
A sample directory structure is available [here](https://git.xdrm.io/example/aicra/src/master/middleware.generic).
##### 5. Custom types
In your configuration you will have to use built-in types (*e.g.* int, any, varchar), but if you want project-specific ones, you can add your own types inside the `type` folder. You can check what structure to follow by looking at the [built-in types](https://git.xdrm.io/go/aicra/src/master/internal/checker/default). Also it is not required that you use built-in types, you can ignore them by setting `types.default = false` in the _aicra.json_ configuration.
Each type must be **directly** inside the `type` folder. The package name is arbitrary and does not have to match the name (but it is better if it is explicit), because the `Match()` method already matches the name.
###### Plugin driver
Each type checker must be **directly** inside the `type` folder (according to the _aicra.json_ configuration).
> Example - the `number` type checker will be inside `type/number/main.go`.
A sample directory structure is available [here](https://git.xdrm.io/example/aicra/src/master/type.plugin).
###### Generic driver
This is the same as with the plugin driver but instead of without `/main.go` at the end.
> Example - the `number` type checker will be inside `type/number` where **number** is an executable
A sample directory structure is available [here](https://git.xdrm.io/example/aicra/src/master/type.generic).
#### III. Build your project
After each controller, middleware or type implementation, you'll have to compile the project. This can be achieved through the command-line builder.
Usage is `aicra /path/to/your/project`.
Usually you just have to run the following command inside your project directory :
```bash
aicra .
```
The output should look like
.
#### IV. Main
The main default program is pretty small as below :
```go
package main
import (
"git.xdrm.io/go/aicra"
"net/http"
)
func main() {
// 1. create the API from the configuration file
server, err := aicra.New("api.json")
if err != nil {
panic(err)
}
// 2. listen to incoming http requests
err = http.ListenAndServe("127.0.0.1:4242", server)
if err != nil {
panic(err)
}
}
```
#### V. Change Log
- [x] human-readable json configuration
- [x] nested routes (*i.e. `/user/:id:` and `/user/post/:id:`*)
- [ ] nested URL arguments (*i.e. `/user/:id:` and `/user/:id:/post/:id:`*)
- [x] useful http methods: GET, POST, PUT, DELETE
- [x] manage URL, query and body arguments:
- [x] multipart/form-data (variables and file uploads)
- [x] application/x-www-form-urlencoded
- [x] application/json
- [x] required vs. optional parameters with a default value
- [x] parameter renaming
- [ ] generic authentication system (*i.e. you can override the built-in one*)
- [x] generic type check (*i.e. implement custom types alongside built-in ones*)
- [ ] built-in types
- [x] `any` - wildcard matching all values
- [x] `int` - any number (*e.g. float, int, uint*)
- [x] `string` - any text
- [x] `varchar(min, max)` - any string with a length between `min` and `max`
- [ ] `` - array containing **only** elements matching `a` type
- [ ] `` - map containing **only** keys of type `a` and values of type `b` (*a or b can be ommited*)
- [x] generic controllers implementation (shared objects)
- [x] response interface
- [ ] devmode watcher : watch manifest, watch plugins to compile + hot reload them
- [x] driver for Go plugins
- [x] controllers
- [x] middlewares
- [x] type checkers
- [x] driver working with any executable through standard input and output
- [x] controllers
- [x] middlewares
- [x] type checkers
- [x] project configuration file to select **driver**, source folders and whether to load default type checkers.
- [x] used to compile the project by the `aicra` command
- [x] used to create an API from `aicra.New()`