aws api auth plugins

+// 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/astaxie/beego"
+//		"github.com/astaxie/beego/plugins/apiauth"
+//	)
+//
+//	func main(){
+//		// apiauth every request
+//		beego.InsertFilter("*", beego.BeforeRouter,auth.APIAuth("appid","appkey"))
+//		beego.Run()
+//	}
+//
+package apiauth
+
+import (
+	"crypto/hmac"
+	"crypto/sha256"
+	"encoding/base64"
+	"fmt"
+	"net/url"
+	"sort"
+	"strings"
+	"time"
+
+	"github.com/astaxie/beego"
+	"github.com/astaxie/beego/context"
+)
+
+type AppIdToAppSecret func(string) string
+
+func APIBaiscAuth(appid, appkey string) beego.FilterFunc {
+	ft := func(aid string) string {
+		if aid == appid {
+			return appkey
+		}
+		return ""
+	}
+	return APIAuthWithFunc(ft, 300)
+}
+
+func APIAuthWithFunc(f AppIdToAppSecret, timeout int) beego.FilterFunc {
+	return func(ctx *context.Context) {
+		if ctx.Input.Query("appid") == "" {
+			ctx.Output.SetStatus(403)
+			ctx.WriteString("miss query param: appid")
+			return
+		}
+		appsecret := f(ctx.Input.Query("appid"))
+		if appsecret == "" {
+			ctx.Output.SetStatus(403)
+			ctx.WriteString("not exist this appid")
+			return
+		}
+		if ctx.Input.Query("signature") == "" {
+			ctx.Output.SetStatus(403)
+			ctx.WriteString("miss query param: signature")
+			return
+		}
+		if ctx.Input.Query("timestamp") == "" {
+			ctx.Output.SetStatus(403)
+			ctx.WriteString("miss query param: timestamp")
+			return
+		}
+		u, err := time.Parse("2006-01-02 15:04:05", ctx.Input.Query("timestamp"))
+		if err != nil {
+			ctx.Output.SetStatus(403)
+			ctx.WriteString("timestamp format is error, should 2006-01-02 15:04:05")
+			return
+		}
+		t := time.Now()
+		if (t.Second() - u.Second()) > timeout {
+			ctx.Output.SetStatus(403)
+			ctx.WriteString("timeout! the request time is long ago, please try again")
+			return
+		}
+		if ctx.Input.Query("signature") !=
+			Signature(appsecret, ctx.Input.Method(), ctx.Request.Form, ctx.Input.Uri()) {
+			ctx.Output.SetStatus(403)
+			ctx.WriteString("auth failed")
+		}
+	}
+}
+
+func Signature(appsecret, method string, params url.Values, RequestURI string) (result string) {
+	var query string
+	pa := make(map[string]string)
+	for k, v := range params {
+		pa[k] = v[0]
+	}
+	vs := mapSorter(pa)
+	vs.Sort()
+	for i := 0; i < vs.Len(); i++ {
+		if vs.Keys[i] == "signature" {
+			continue
+		}
+		if vs.Keys[i] != "" && vs.Vals[i] != "" {
+			query = fmt.Sprintf("%v%v%v", query, vs.Keys[i], vs.Vals[i])
+		}
+	}
+	string_to_sign := fmt.Sprintf("%v\n%v\n%v\n", method, query, RequestURI)
+
+	sha256 := sha256.New
+	hash := hmac.New(sha256, []byte(appsecret))
+	hash.Write([]byte(string_to_sign))
+	sha := base64.StdEncoding.EncodeToString(hash.Sum(nil))
+	sha = url.QueryEscape(sha)
+	sha = strings.Replace(sha, "+", "%20", -1)
+	sha = strings.Replace(sha, "*", "%2A", -1)
+	sha = strings.Replace(sha, "%7E", "~", -1)
+	return sha
+}
+
+type valSorter struct {
+	Keys []string
+	Vals []string
+}
+
+func mapSorter(m map[string]string) *valSorter {
+	vs := &valSorter{
+		Keys: make([]string, 0, len(m)),
+		Vals: make([]string, 0, len(m)),
+	}
+	for k, v := range m {
+		vs.Keys = append(vs.Keys, k)
+		vs.Vals = append(vs.Vals, v)
+	}
+	return vs
+}
+
+func (vs *valSorter) Sort() {
+	sort.Sort(vs)
+}
+
+func (vs *valSorter) Len() int           { return len(vs.Keys) }
+func (vs *valSorter) Less(i, j int) bool { return vs.Keys[i] < vs.Keys[j] }
+func (vs *valSorter) Swap(i, j int) {
+	vs.Vals[i], vs.Vals[j] = vs.Vals[j], vs.Vals[i]
+	vs.Keys[i], vs.Keys[j] = vs.Keys[j], vs.Keys[i]
+}