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engine.go
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engine.go
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package ctugo
import (
"bytes"
"crypto/md5"
"encoding/base64"
"encoding/hex"
"fmt"
"reflect"
"sort"
"sync"
"time"
json "github.com/json-iterator/go"
"github.com/valyala/fasthttp"
)
var (
// sign pool, for memory reuse
signBufPool = sync.Pool{
New: func() interface{} {
return new(bytes.Buffer)
},
}
client = &fasthttp.Client{
MaxConnsPerHost: 16384, // MaxConnsPerHost default is 512, increase to 16384
ReadTimeout: 5 * time.Second,
WriteTimeout: 5 * time.Second,
}
)
type EngineResponse struct {
UUID string `json:"uuid"`
Status string `json:"status"`
Result engineResult `json:"result"`
}
type engineResult struct {
RiskLevel string `json:"riskLevel"`
RiskType string `json:"riskType"`
Suggestion []map[string]string `json:"suggestion"`
HitPolicyCode string `json:"hitPolicyCode"`
HitPolicyName string `json:"hitPolicyName"`
HitRules []map[string]interface{} `json:"hitRules"`
SuggestPolicies []map[string]string `json:"suggestPolicies"`
Flag string `json:"flag"`
ExtraInfo map[string]interface{} `json:"extraInfo"`
NameListJSON map[string]string `json:"nameListJson"`
}
// EngineConnection object of engine pet tester
type EngineConnection struct {
URLWithoutSign string
Host string
AppKey string
AppSecret string
}
// NewEngineConnection generate a new EngineConnection object
func NewEngineConnection(host, appKey, appSecret string) *EngineConnection {
return &EngineConnection{
Host: host,
AppKey: appKey,
AppSecret: appSecret,
URLWithoutSign: fmt.Sprintf("%s?appKey=%s&version=1&sign=", host, appKey),
}
}
// CallRiskEngine is used to send request to ctu engine, and got EngineResponse and error
func (e *EngineConnection) CallRiskEngine(eventCode string, flag string, fields map[string]interface{}) (*EngineResponse, error) {
data, err := e.getData(eventCode, flag, fields)
if err != nil {
return nil, err
}
req := fasthttp.AcquireRequest()
req.SetRequestURI(e.URLWithoutSign + e.getSign(eventCode, flag, fields))
req.Header.SetMethod("POST")
req.Header.SetContentType("text/plain")
req.SetBody(data)
resp := fasthttp.AcquireResponse()
defer fasthttp.ReleaseResponse(resp)
defer fasthttp.ReleaseRequest(req)
if err := client.Do(req, resp); err != nil {
return nil, err
}
if resp.StatusCode() != fasthttp.StatusOK {
return nil, fmt.Errorf("%d", resp.StatusCode())
}
result := &EngineResponse{}
if err := json.Unmarshal(resp.Body(), &result); err != nil {
return nil, err
}
return result, nil
}
func (e *EngineConnection) getSign(eventCode string, flag string, fields map[string]interface{}) string {
data := signBufPool.Get().(*bytes.Buffer)
data.Reset()
data.WriteString(e.AppSecret)
data.WriteString("eventCode")
data.WriteString(eventCode)
data.WriteString("flag")
data.WriteString(flag)
keys := make([]string, len(fields))
idx := 0
for key := range fields {
keys[idx] = key
idx++
}
sort.Strings(keys)
for _, key := range keys {
data.WriteString(key)
value := fields[key]
if value != nil && reflect.TypeOf(value).Name() == "string" {
data.WriteString(value.(string))
} else {
valueStr, _ := json.Marshal(value)
data.Write(valueStr)
}
}
data.WriteString(e.AppSecret)
sum := md5.Sum(data.Bytes())
signBufPool.Put(data)
return hex.EncodeToString(sum[:])
}
func (e *EngineConnection) getData(eventCode string, flag string, fields map[string]interface{}) ([]byte, error) {
var data []byte
var err error
data, err = json.Marshal(map[string]interface{}{
"flag": flag,
"data": fields,
"eventCode": eventCode,
})
if err != nil {
return nil, err
}
dst := make([]byte, base64.StdEncoding.EncodedLen(len(data)))
base64.StdEncoding.Encode(dst, data)
return dst, nil
}