Apiware

Apiware binds the specified parameters of the Golang net/http and fasthttp requests to the structure and verifies the validity of the parameter values.

It is suggested that you can use the struct as the Handler of the web framework, and use the middleware to quickly bind the request parameters, saving a lot of parameter type conversion and validity verification. At the same time through the struct tag, create swagger json configuration file, easy to create api document services.

Apiware将Go语言net/http及fasthttp请求的指定参数绑定到结构体，并验证参数值的合法性。 建议您可以使用结构体作为web框架的Handler，并用该中间件快速绑定请求参数，节省了大量参数类型转换与有效性验证的工作。同时还可以通过该结构体标签，创建swagger的json配置文件，轻松创建api文档服务。

Demo 示例

package main

import (
    "encoding/json"
    "github.com/henrylee2cn/apiware"
    // "mime/multipart"
    "net/http"
    "strings"
)

type TestApiware struct {
    Id           int         `param:"in(path),required,desc(ID),range(1:2)"`
    Num          float32     `param:"in(query),name(n),range(0.1:10.19)"`
    Title        string      `param:"in(query),nonzero"`
    Paragraph    []string    `param:"in(query),name(p),len(1:10)" regexp:"(^[\\w]*$)"`
    Cookie       http.Cookie `param:"in(cookie),name(apiwareid)"`
    CookieString string      `param:"in(cookie),name(apiwareid)"`
    // Picture   multipart.FileHeader `param:"in(formData),name(pic),maxmb(30)"`
}

var myApiware = apiware.New(pathDecodeFunc, nil, nil)

var pattern = "/test/:id"

func pathDecodeFunc(urlPath, pattern string) apiware.KV {
    idx := map[int]string{}
    for k, v := range strings.Split(pattern, "/") {
        if !strings.HasPrefix(v, ":") {
            continue
        }
        idx[k] = v[1:]
    }
    pathParams := make(map[string]string, len(idx))
    for k, v := range strings.Split(urlPath, "/") {
        name, ok := idx[k]
        if !ok {
            continue
        }
        pathParams[name] = v
    }
    return apiware.Map(pathParams)
}

func testHandler(resp http.ResponseWriter, req *http.Request) {
    // set cookies
    http.SetCookie(resp, &http.Cookie{
        Name:  "apiwareid",
        Value: "http_henrylee2cn",
    })

    // bind params
    params := new(TestApiware)
    err := myApiware.Bind(params, req, pattern)
    b, _ := json.MarshalIndent(params, "", " ")
    if err != nil {
        resp.WriteHeader(http.StatusBadRequest)
        resp.Write(append([]byte(err.Error()+"\n"), b...))
    } else {
        resp.WriteHeader(http.StatusOK)
        resp.Write(b)
    }
}

func main() {
    // Check whether `testHandler` meet the requirements of apiware, and register it
    err := myApiware.Register(new(TestApiware))
    if err != nil {
        panic(err)
    }

    // server
    http.HandleFunc("/test/0", testHandler)
    http.HandleFunc("/test/1", testHandler)
    http.HandleFunc("/test/1.1", testHandler)
    http.HandleFunc("/test/2", testHandler)
    http.HandleFunc("/test/3", testHandler)
    http.ListenAndServe(":8080", nil)
}

Struct&Tag 结构体及其标签

tag	key	required	value	desc
param	in	only one	path	(position of param) if required is unsetted, auto set it. e.g. url: http://www.abc.com/a/{path}
param	in	only one	query	(position of param) e.g. url: http://www.abc.com/a?b={query}
param	in	only one	formData	(position of param) e.g. request body: a=123&b={formData}
param	in	only one	body	(position of param) request body can be any content
param	in	only one	header	(position of param) request header info
param	in	only one	cookie	(position of param) request cookie info, support: http.Cookie, fasthttp.Cookie, string, []byte and so on
param	name	no	(e.g. id)	specify request param`s name
param	required	no	required	request param is required
param	desc	no	(e.g. id)	request param description
param	len	no	(e.g. 3:6``3)	length range of param's value
param	range	no	(e.g. 0:10)	numerical range of param's value
param	nonzero	no	nonzero	param`s value can not be zero
param	maxmb	no	(e.g. 32)	when request Content-Type is multipart/form-data, the max memory for body.(multi-param, whichever is greater)
regexp		no	(e.g. ^\w+$)	param value can not be null
err		no	(e.g. incorrect password format)	the custom error for binding or validating
NOTES:

• the binding object must be a struct pointer
• the binding struct's field can not be a pointer
• regexp or param tag is only usable when param:"type(xxx)" is exist
• if the param tag is not exist, anonymous field will be parsed
• when the param's position(in) is formData and the field's type is multipart.FileHeader, the param receives file uploaded
• if param's position(in) is cookie, field's type must be http.Cookie
• param tags in(formData) and in(body) can not exist at the same time
• there should not be more than one in(body) param tag

Field Types 结构体字段类型

base	slice	special
string	[]string	[][]byte
byte	[]byte	[][]uint8
uint8	[]uint8	multipart.FileHeader (only for formData param)
bool	[]bool	http.Cookie (only for net/http's cookie param)
int	[]int	fasthttp.Cookie (only for fasthttp's cookie param)
int8	[]int8	struct (struct type only for body param or as an anonymous field to extend params)
int16	[]int16
int32	[]int32
int64	[]int64
uint8	[]uint8
uint16	[]uint16
uint32	[]uint32
uint64	[]uint64
float32	[]float32
float64	[]float64