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apiauth.go
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apiauth.go
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// Copyright 2014 beego Author. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package apiauth provides handlers to enable apiauth support.
//
// Simple Usage:
// import(
// "github.com/beego/beego/v2"
// "github.com/beego/beego/v2/server/web/filter/apiauth"
// )
//
// func main(){
// // apiauth every request
// beego.InsertFilter("*", beego.BeforeRouter,apiauth.APIBasicAuth("appid","appkey"))
// beego.Run()
// }
//
// Advanced Usage:
//
// func getAppSecret(appid string) string {
// // get appsecret by appid
// // maybe store in configure, maybe in database
// }
//
// beego.InsertFilter("*", beego.BeforeRouter,apiauth.APISecretAuth(getAppSecret, 360))
//
// Information:
//
// In the request user should include these params in the query
//
// 1. appid
//
// appid is assigned to the application
//
// 2. signature
//
// get the signature use apiauth.Signature()
//
// when you send to server remember use url.QueryEscape()
//
// 3. timestamp:
//
// send the request time, the format is yyyy-mm-dd HH:ii:ss
//
package apiauth
import (
"bytes"
"crypto/hmac"
"crypto/sha256"
"encoding/base64"
"fmt"
"net/url"
"sort"
"time"
"github.com/beego/beego/v2/server/web"
"github.com/beego/beego/v2/server/web/context"
)
// AppIDToAppSecret gets appsecret through appid
type AppIDToAppSecret func(string) string
// APIBasicAuth uses the basic appid/appkey as the AppIdToAppSecret
func APIBasicAuth(appid, appkey string) web.FilterFunc {
ft := func(aid string) string {
if aid == appid {
return appkey
}
return ""
}
return APISecretAuth(ft, 300)
}
// APISecretAuth uses AppIdToAppSecret verify and
func APISecretAuth(f AppIDToAppSecret, timeout int) web.FilterFunc {
return func(ctx *context.Context) {
if ctx.Input.Query("appid") == "" {
ctx.ResponseWriter.WriteHeader(403)
ctx.WriteString("missing query parameter: appid")
return
}
appsecret := f(ctx.Input.Query("appid"))
if appsecret == "" {
ctx.ResponseWriter.WriteHeader(403)
ctx.WriteString("appid query parameter missing")
return
}
if ctx.Input.Query("signature") == "" {
ctx.ResponseWriter.WriteHeader(403)
ctx.WriteString("missing query parameter: signature")
return
}
if ctx.Input.Query("timestamp") == "" {
ctx.ResponseWriter.WriteHeader(403)
ctx.WriteString("missing query parameter: timestamp")
return
}
u, err := time.Parse("2006-01-02 15:04:05", ctx.Input.Query("timestamp"))
if err != nil {
ctx.ResponseWriter.WriteHeader(403)
ctx.WriteString("incorrect timestamp format. Should be in the form 2006-01-02 15:04:05")
return
}
t := time.Now()
if t.Sub(u).Seconds() > float64(timeout) {
ctx.ResponseWriter.WriteHeader(403)
ctx.WriteString("request timer timeout exceeded. Please try again")
return
}
if ctx.Input.Query("signature") !=
Signature(appsecret, ctx.Input.Method(), ctx.Request.Form, ctx.Input.URL()) {
ctx.ResponseWriter.WriteHeader(403)
ctx.WriteString("authentication failed")
}
}
}
// Signature generates signature with appsecret/method/params/RequestURI
func Signature(appsecret, method string, params url.Values, RequestURL string) (result string) {
var b bytes.Buffer
keys := make([]string, len(params))
pa := make(map[string]string)
for k, v := range params {
pa[k] = v[0]
keys = append(keys, k)
}
sort.Strings(keys)
for _, key := range keys {
if key == "signature" {
continue
}
val := pa[key]
if key != "" && val != "" {
b.WriteString(key)
b.WriteString(val)
}
}
stringToSign := fmt.Sprintf("%v\n%v\n%v\n", method, b.String(), RequestURL)
sha256 := sha256.New
hash := hmac.New(sha256, []byte(appsecret))
hash.Write([]byte(stringToSign))
return base64.StdEncoding.EncodeToString(hash.Sum(nil))
}