big update of the readme with examples and driver.generic input/output data definition
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README.md
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README.md
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@ -245,10 +245,10 @@ In this example you can see a pretty basic user/article REST API definition. The
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#### 3. Controllers
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Controllers implement `Get`, `Post`, `Put`, and `Delete` methods, and have access to special variables surrounded by underscores :
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Controllers implement `Get`, `Post`, `Put`, and `Delete` methods, and have access to special variables injected in the argument list :
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- `_HTTP_METHOD_` the request's HTTP method in uppercase
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- `_SCOPE_` the scope filled by middlewares
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- `_SCOPE_` the scope filled by middle-wares
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- `_AUTHORIZATION_` the request's **Authorization** header
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@ -259,73 +259,148 @@ Also special variables found in the return data are processed with special actio
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###### Plugin driver
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##### 1. Plugin driver
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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.
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> <u>Example</u> - `/path/to/some/uri` will be inside `controller/path/to/some/uri/main.go`
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> <u>Exception</u> - `/` will be inside `controller/ROOT/main.go`
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> <u>Example</u> - the URI `/path/to/some/uri` is handled by the file `controller/path/to/some/uri/main.go`
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>
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> <u>Exception</u> - the URI `/` is handled by the file `controller/ROOT/main.go`
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A sample directory structure is available [here](https://git.xdrm.io/example/aicra/src/master/controller.plugin).
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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.
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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.
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###### Generic driver
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**Example**
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This is the same as with the plugin driver but instead of without `/main.go` at the end.
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Here is a base code for any controllers
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> <u>Example</u> - `/path/to/some/uri` will be inside `controller/path/to/some/uri` where the **uri** file is an executable.
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```go
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package main
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import (
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"git.xdrm.io/go/aicra/driver"
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"git.xdrm.io/go/aicra/response"
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e "git.xdrm.io/go/aicra/err"
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)
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> <u>Exception</u> - `/` will be inside `controller/ROOT`.
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// Mockup controller implementation
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type MyController interface{}
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func Export() driver.Controller { return new(MyController) }
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// GET method management
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func (c MyController) Get(args response.Arguments) response.Response {
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res := response.New()
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res.Err = e.Success
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return *res
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}
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// POST method management
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func (c MyController) Post(args response.Arguments) response.Response { /*...*/ }
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// PUT method management
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func (c MyController) Put(args response.Arguments) response.Response { /*...*/ }
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// DELETE method management
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func (c MyController) Delete(args response.Arguments) response.Response { /*...*/ }
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```
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##### 2. Generic driver
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This is the same as with the plugin driver but without `/main.go` at the end.
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> <u>Example</u> - The URI `/path/to/some/uri` will be handled by the executable `controller/path/to/some/uri`.
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> <u>Exception</u> - The URI `/` will be handled by the executable `controller/ROOT`.
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A sample directory structure is available [here](https://git.xdrm.io/example/aicra/src/master/controller.generic).
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The programs will be given useful data (*i.e. method and arguments*) through its input arguments :
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| Argument index | Description | Examble value |
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| -------------- | ------------------------------------------------------------ | ------------------------------------------------------------ |
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| 1 | Uppercase HTTP method.<br>(_e.g. **$1** in bash, **argv[1]** in php_) | `GET`, `POST`, ... |
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| 2 | JSON representation of the input arguments.<br>(_e.g. **$2** in bash, **argv[2]** in php_) | `{`<br> `"_SCOPE_": ["admin", "token"],`<br> `"somstring": "string",`<br> `"someint": 12`<br>`}` |
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#### 4. Middlewares
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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_`.
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The standard output you will give back must be a key-value JSON representation of all the output variables.
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###### Plugin driver
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#### 4. Middle-wares
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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_`.
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##### 1. Plugin driver
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Each middleware must be **directly** inside the `middleware` folder (according to the _aicra.json_ configuration).
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> Example - the `1-authentication` middleware will be inside `middleware/1-authentication/main.go`.
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**Note** - middleware execution will be ordered by name. Prefixing your middlewares with their order is a good practice.
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**Note** - middle-ware execution will be ordered by name. Prefixing your middle-wares with their order is a good practice.
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A sample directory structure is available [here](https://git.xdrm.io/example/aicra/src/master/middleware.plugin).
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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.
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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.
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**Example**
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Here is a base code for any middle-ware
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```go
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package main
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import (
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"git.xdrm.io/go/aicra/driver"
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"net/http"
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)
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// Mockup middle-ware implementation
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type MyMiddleware interface{}
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func Export() driver.Middleware { return new(MyMiddleware) }
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func (c MyMiddleware) Inspect(req http.Request, scope *[]string) {
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// add scope according to request
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if req.Header.Get("SomeHeader") {
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*scope = append(*scope, "some-scope")
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}
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}
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```
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###### Generic driver
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##### 2. Generic driver
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This is the same as with the plugin driver but instead of without `/main.go` at the end.
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> Example - the `1-authentication` middleware will be inside `middleware/1-authentication` where **1-authentication** is an executable
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> Example - the `1-authentication` middle-ware will be inside `middleware/1-authentication` where **1-authentication** is an executable
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A sample directory structure is available [here](https://git.xdrm.io/example/aicra/src/master/middleware.generic).
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The programs will be given useful data (*i.e. method and arguments*) through its input arguments :
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| Argument index | Description | Examble value |
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| -------------- | ------------------------------------------------------------ | ------------- |
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| 1 | JSON representation of the input arguments.<br>(_e.g. **$1** in bash, **argv[1]** in php_) | ??? |
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The standard output you will give back must be a JSON array containing the scope you want to add.
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#### 5. Type checkers
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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.
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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.
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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.
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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.
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###### Plugin driver
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##### 1. Plugin driver
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Each type checker must be **directly** inside the `type` folder (according to the _aicra.json_ configuration).
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@ -333,7 +408,9 @@ Each type checker must be **directly** inside the `type` folder (according to th
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A sample directory structure is available [here](https://git.xdrm.io/example/aicra/src/master/type.plugin).
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###### Generic driver
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##### 2. Generic driver
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This is the same as with the plugin driver but instead of without `/main.go` at the end.
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@ -343,6 +420,20 @@ A sample directory structure is available [here](https://git.xdrm.io/example/aic
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The programs will be given useful data (*i.e. method and arguments*) through its input arguments :
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| Argument index | Description | Examble value |
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| -------------- | ------------------------------------------------------------ | ------------------ |
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| 1 | Uppercase method.<br>(_e.g. **$1** in bash, **argv[1]** in php_) | `MATCH` or `CHECK` |
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| 2 | JSON representation of the input arguments.<br>(_e.g. **$2** in bash, **argv[2]** in php_) | ??? |
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The standard output you will give back must be a `1` or `0` representing `true` and `false`.
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+ 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.
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+ 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.
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### III. Build your project
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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.
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@ -361,7 +452,7 @@ The output should look like
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#### IV. Main
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The main default program is pretty small as below :
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The main default program is pretty small as shown below :
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```go
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package main
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@ -373,11 +464,11 @@ import (
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func main() {
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// load config
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// build from config
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server, err := aicra.New("api.json")
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if err != nil { panic(err) }
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// bind server
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// launch server
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err = http.ListenAndServe("127.0.0.1:4242", server)
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if err != nil { panic(err) }
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