diff --git a/README.md b/README.md index 7ce67eb..20ff048 100644 --- a/README.md +++ b/README.md @@ -7,146 +7,96 @@ [![Build Status](https://ci.migration.xdrm.io/buildStatus/icon?job=aicra%2F0.2.0)](.) -**Aicra** is a *configuration-driven* REST **API engine** in *Go* that allows you to create a fully featured API. +**Aicra** is a *configuration-driven* **web framework** written in Go that allows you to create a fully featured REST API. -The whole API management is done for you from a configuration file describing your API, you just need to implement : +The whole management is done for you from a configuration file describing your API, you're left with implementing : +- controllers +- optionnally middle-wares (_e.g. authentication, csrf_) +- and optionnally type checkers to check input parameters -- the controllers -- the middle-wares (_e.g. authentication, csrf_) -- and optionnally the type checkers to check if input values follows some rules -> There is 2 available drivers that will load your implementations. The `plugin` driver is for Go programmers, the `generic` one is for any language (it uses standard input and output). +The aicra server fulfills the `net/http` [Server interface](https://golang.org/pkg/net/http/#Server). -The engine has been designed with the following concepts in mind. - -| 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 API, its behavior and its automation flow. | - - -> A example project is available [here](https://git.xdrm.io/example/aicra) +> A example project is available [here](https://git.xdrm.io/go/tiny-url-ex) ### 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. Compilation configuration](#1-compilation-configuration) - * [Example](#example) - * [2. API Configuration](#2-api-configuration) - * [Definition](#definition) - * [Input Arguments](#input-arguments) - * [1. Input types](#1-input-types) - * [2. Global Format](#2-global-format) - * [3. Example](#3-example) - * [3. Controllers](#3-controllers) - * [1. Plugin driver](#1-plugin-driver) - * [2. Generic driver](#2-generic-driver) - * [4. Middle-wares](#4-middle-wares) - * [1. Plugin driver](#1-plugin-driver-1) - * [2. Generic driver](#2-generic-driver-1) - * [5. Type checkers](#5-type-checkers) - * [1. Plugin driver](#1-plugin-driver-2) - * [2. Generic driver](#2-generic-driver-2) -* [III. Build your project](#iii-build-your-project) - * [IV. Main](#iv-main) - * [V. Change Log](#v-change-log) +- [I/ Installation](#i-installation) +- [II/ Development](#ii-development) + * [1) Main executable](#1-main-executable) + * [2) API Configuration](#2-api-configuration) + - [Definition](#definition) + + [Input Arguments](#input-arguments) + - [1. Input types](#1-input-types) + - [2. Global Format](#2-global-format) +- [III/ Change Log](#iii-change-log) -### I. Installation +### I/ Installation -You need a recent machine with `go` [installed](https://golang.org/doc/install). +You need a recent machine with `go` [installed](https://golang.org/doc/install). This package has not been tested under the version **1.10**. -> 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 as `git.xdrm.io/go/aicra` your imports. Moreover, the **project compiler** 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 symbolic link into `/usr/local/bin` for instance. +The library should now be available as `git.xdrm.io/go/aicra` in your imports. - -### II. Setup a project - -The default project structure is : - -```bash -├── main.go # entry point -| -├── aicra.json # server configuration file -├── api.json # API configuration file -| -├── middleware # middleware implementations -├── controller # controller implementations -└── type # custom type checkers -``` +### II/ Development +#### 1) Main executable -#### 1. Compilation configuration +The main executable will declare and run the aicra server, it might look quite like the code below. -The `aicra.json` configuration file defines where are located your controllers, type checkers, and middle-wares ; also it contains what driver you want to use, you have 2 choices : +```go +package main +import ( + "log" + "net/http" -1. **plugin** - for Go implementations (_c.f. [go plugin system](https://golang.org/pkg/plugin/)_) -2. **generic** - for any language implementation (uses standard input and output) + "git.xdrm.io/go/aicra" + "git.xdrm.io/go/aicra/typecheck/builtin" + "git.xdrm.io/go/aicra/api" +) +func main() { + // 1. build server + server, err := aicra.New("path/to/your/api/definition.json"); + if err != nil { + log.Fatalf("Cannot build the aicra server: %v\n", err) + } -The file uses the [json](https://json.org/) format, each field is described in the table above. + // 2. add type checkers + server.Checkers.Add( builtin.NewAny() ); + server.Checkers.Add( builtin.NewString() ); + server.Checkers.Add( builtin.NewFloat64() ); -| field | description | example value | -| ---------------------- | ------------------------------------------------------------ | --------------------------------- | -| `root` | The project folder path | `./some-path` or `/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` or `false` | -| `types`.`folder` | The folder (relative to the project root) where type checkers' implementations are located | `./type` or `type` | -| `controllers`.`folder` | The folder (relative to the project root) where controllers' implementations are located | `./controller` or `controller` | -| `middlewares`.`folder` | The folder (relative to the project root) where middlewares' implementations are located | `./middleware` or `middleware` | + // 3. bind your implementations + server.HandleFunc(http.MethodGet, func(req api.Request, res *api.Response){ + // ... process stuff ... + res.SetError(api.ErrorSuccess()); + }) -A sample file can be found [here](https://git.xdrm.io/example/aicra/src/master/aicra.json). - - - -###### Example - -In this example we have the controllers inside the `controller` folder, the middle-wares in the `middleware` folder and custom type checkers inside the `checker` folder, we want to load the built-in type checkers and are using the `plugin` driver. Also our project root is the relative current path `.` ; note that it is better using an absolute path as your project root. - -```json -{ - "root": ".", - "driver": "plugin", - "types": { - "default": true, - "folder": "checker" - }, - "controllers": { - "folder": "controller.plugin" - }, - "middlewares": { - "folder": "middleware.plugin" - } + // 4. launch server + log.Fatal( http.ListenAndServer("localhost:8181", server) ) } ``` -#### 2. API Configuration +#### 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 : +The whole project behavior is described inside a json file (_e.g. usually api.json_) file. For a better understanding of the format, take a look at this working [template](https://git.xdrm.io/go/tiny-url-ex/src/master/api.json). This file defines : - resource routes and their methods - every input for each method (called *argument*) @@ -182,11 +132,8 @@ For each method you will have to create fields described in the table above. | `out` | The list of output data that will be returned by your controllers. It has the same syntax as the `in` field but is only use for readability purpose and documentation. | | - ##### Input Arguments - - ###### 1. Input types Input arguments defines what data from the HTTP request the method needs. Aicra is able to extract 3 types of data : @@ -239,248 +186,7 @@ In this example we want 3 arguments : -###### 3. Example - -In this example you can see a pretty basic user/article REST API definition. The API let's you fetch, create, edit, and delete users and do the same for their articles. Users actions will be available at the uri `/user`, and `/article` for articles. - - - -#### 3. Controllers - -Controllers implement `Get`, `Post`, `Put`, and `Delete` methods, and have access to special variables injected in the argument list : - -- `_HTTP_METHOD_` the request's HTTP method in uppercase -- `_SCOPE_` the scope filled by middle-wares -- `_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 - - - -##### 1. 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 - the URI `/path/to/some/uri` is handled by the file `controller/path/to/some/uri/main.go` -> -> Exception - the URI `/` is handled by the file `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 [driver.Controller](https://godoc.org/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. - -**Example** - -Here is a base code for any controllers - -```go -package main -import ( - "git.xdrm.io/go/aicra/driver" - "git.xdrm.io/go/aicra/api" - e "git.xdrm.io/go/aicra/err" -) - -// Mockup controller implementation -type MyController interface{} -func Export() driver.Controller { return new(MyController) } - -// GET method management -func (c MyController) Get(args api.Arguments) api.Response { - res := api.NewResponse() - res.Err = e.Success - return *res -} - -// POST method management -func (c MyController) Post(args api.Arguments) api.Response { /*...*/ } - -// PUT method management -func (c MyController) Put(args api.Arguments) api.Response { /*...*/ } - -// DELETE method management -func (c MyController) Delete(args api.Arguments) api.Response { /*...*/ } -``` - - - -##### 2. Generic driver - -This is the same as with the plugin driver but without `/main.go` at the end. - -> Example - The URI `/path/to/some/uri` will be handled by the executable `controller/path/to/some/uri`. - -> Exception - The URI `/` will be handled by the executable `controller/ROOT`. - -A sample directory structure is available [here](https://git.xdrm.io/example/aicra/src/master/controller.generic). - - - -The programs will be given useful data (*i.e. method and arguments*) through its input arguments : - -| Argument index | Description | Examble value | -| -------------- | ------------------------------------------------------------ | ------------------------------------------------------------ | -| 1 | Uppercase HTTP method.
(_e.g. **$1** in bash, **argv[1]** in php_) | `GET`, `POST`, ... | -| 2 | JSON representation of the input arguments.
(_e.g. **$2** in bash, **argv[2]** in php_) | `{`
`"_SCOPE_": ["admin", "token"],`
`"somstring": "string",`
`"someint": 12`
`}` | - -The standard output you will give back must be a key-value JSON representation of all the output variables. - - - -#### 4. Middle-wares - -In order for your project to manage authentication, the best solution is to use middle-wares, 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 Scopes are used to match the `scope` field in the configuration file and automatically block access to non-authenticated method calls. Scopes can also be used for implementation-specific behavior such as _CSRF_ management. Controllers have access to the scope through the variable `_SCOPE_`. - - - -##### 1. 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** - middle-ware execution will be ordered by name. Prefixing your middle-wares 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 middle-ware must implement the [driver.Middleware](https://godoc.org/git.xdrm.io/go/aicra/driver#Middleware) interface. In addition you must declare the function `func Export() Middleware` to allow dynamic loading of your middle-ware. - -**Example** - -Here is a base code for any middle-ware - -```go -package main -import ( - "git.xdrm.io/go/aicra/driver" - "net/http" -) - -// Mockup middle-ware implementation -type MyMiddleware interface{} -func Export() driver.Middleware { return new(MyMiddleware) } - -func (c MyMiddleware) Inspect(req http.Request, scope *[]string) { - // add scope according to request - if req.Header.Get("SomeHeader") { - *scope = append(*scope, "some-scope") - } -} -``` - - - -##### 2. Generic driver - -This is the same as with the plugin driver but instead of without `/main.go` at the end. - -> Example - the `1-authentication` middle-ware 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). - -The programs will be given useful data (*i.e. method and arguments*) through its input arguments : - -| Argument index | Description | Examble value | -| -------------- | ------------------------------------------------------------ | ------------- | -| 1 | JSON representation of the input arguments.
(_e.g. **$1** in bash, **argv[1]** in php_) | ??? | - -The standard output you will give back must be a JSON array containing the scope you want to add. - - - -#### 5. Type checkers - -In your configuration you can use built-in types (*e.g.* int, any, varchar, token, float, ...), 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 does that. - -##### 1. 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). - - - -##### 2. 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). - - - -The programs will be given useful data (*i.e. method and arguments*) through its input arguments : - -| Argument index | Description | Examble value | -| -------------- | ------------------------------------------------------------ | ------------------ | -| 1 | Uppercase method.
(_e.g. **$1** in bash, **argv[1]** in php_) | `MATCH` or `CHECK` | -| 2 | JSON representation of the input arguments.
(_e.g. **$2** in bash, **argv[2]** in php_) | ??? | - -The standard output you will give back must be a `1` or `0` representing `true` and `false`. - -+ When calling the `MATCH` method, the input argument consists of a string being the type checker name, you must return `1` this name is handled by the current type checker. -+ When calling the `CHECK` method, the input argument consists of a JSON representation wrapped inside the key `value`. For instance it could be `{"value": [1,2,3]}` if the input value is an array containing 1, 2, and 3. - - - -### III. Build your project - -After each controller, middle-ware or type checker 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 - - ![that](./README.assets/1531039386654.png). - -#### IV. Main - -The main default program is pretty small as shown below : - -```go -package main - -import ( - "git.xdrm.io/go/aicra" - "net/http" -) - -func main() { - - // build from config - server, err := aicra.New("api.json") - if err != nil { panic(err) } - - // launch server - err = http.ListenAndServe("127.0.0.1:4242", server) - if err != nil { panic(err) } - -} -``` - - - - -#### V. Change Log +### III/ Change Log - [x] human-readable json configuration - [x] nested routes (*i.e. `/user/:id:` and `/user/post/:id:`*) @@ -492,26 +198,18 @@ func main() { - [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*)~~ Replaced by the middle-ware system - [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] `int` - see go types + - [x] `uint` - see go types + - [x] `float` - see go types - [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] `string(min, max)` - any string with a length between `min` and `max` + - [ ] `[a]` - array containing **only** elements matching `a` type + - [ ] `[a:b]` - 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()` +- [ ] log bound resources when building the aicra server +- [ ] fail on check for unimplemented resources at server boot. +- [ ] fail on check for unavailable types in api.json at server boot.