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| package notifiers
import (
"bytes"
"encoding/json"
"fmt"
"io"
"mime/multipart"
"net/http"
"os"
"strconv"
"golang.org/x/net/context"
"golang.org/x/net/context/ctxhttp"
"github.com/grafana/grafana/pkg/bus"
"github.com/grafana/grafana/pkg/components/simplejson"
"github.com/grafana/grafana/pkg/infra/log"
m "github.com/grafana/grafana/pkg/models"
"github.com/grafana/grafana/pkg/services/alerting"
)
type WeChatToken struct {
AccessToken string `json:"access_token"`
ErrMsg string `json:"errmsg"`
ErrCode int `json:"errcode"`
ExpireIn int `json:"expire_in"`
}
type WeChatMediaId struct {
MediaId string `json:"media_id"`
ErrMsg string `json:"errmsg"`
ErrCode int `json:"errcode"`
CreatAt string `json:"created_at"`
Type string `json:"type"`
}
const (
SEND_MESSAGE_ENDPOINT string = "https://qyapi.weixin.qq.com/cgi-bin/message/send"
UPLOAD_IMAGE_ENDPOINT string = "https://qyapi.weixin.qq.com/cgi-bin/media/upload"
GET_TOKEN_ENDPOINT string = "https://qyapi.weixin.qq.com/cgi-bin/gettoken"
)
func init() {
alerting.RegisterNotifier(&alerting.NotifierPlugin{
Type: "wechat",
Name: "WeChat",
Description: "Sends HTTP POST request to WeChat",
Factory: NewWeChatNotifier,
OptionsTemplate: `
<h3 class="page-heading">WeChat settings</h3>
<div class="gf-form">
<span class="gf-form-label width-10">AgentId</span>
<input type="text" required class="gf-form-input max-width-26" ng-model="ctrl.model.settings.agentid"></input>
</div>
<div class="gf-form">
<span class="gf-form-label width-10">CorpId</span>
<input type="text" required class="gf-form-input max-width-26" ng-model="ctrl.model.settings.corpid"></input>
</div>
<div class="gf-form">
<span class="gf-form-label width-10">Secret</span>
<input type="text" required class="gf-form-input max-width-26" ng-model="ctrl.model.settings.secret"></input>
</div>
<div class="gf-form">
<span class="gf-form-label width-10">ToUser</span>
<input type="text" required class="gf-form-input max-width-26" ng-model="ctrl.model.settings.touser"></input>
</div>
`,
})
}
func NewWeChatNotifier(model *m.AlertNotification) (alerting.Notifier, error) {
agentid := model.Settings.Get("agentid").MustString()
if agentid == "" {
return nil, alerting.ValidationError{Reason: "Could not find agentid property in settings"}
}
corpid := model.Settings.Get("corpid").MustString()
if corpid == "" {
return nil, alerting.ValidationError{Reason: "Could not find corpid property in settings"}
}
secret := model.Settings.Get("secret").MustString()
if secret == "" {
return nil, alerting.ValidationError{Reason: "Could not find secret property in settings"}
}
touser := model.Settings.Get("touser").MustString()
if touser == "" {
touser = "@all"
}
return &WeChatNotifier{
NotifierBase: NewNotifierBase(model),
AgentId: agentid,
CorpId: corpid,
Secret: secret,
ToUser: touser,
log: log.New("alerting.notifier.wechat"),
}, nil
}
type WeChatNotifier struct {
NotifierBase
AgentId string
CorpId string
Secret string
ToUser string
log log.Logger
}
func (this *WeChatNotifier) GetMediaId(path, token string) (string, error) {
var mediaId string
var b bytes.Buffer
w := multipart.NewWriter(&b)
f, err := os.Open(path)
if err != nil {
return mediaId, err
}
defer f.Close()
fw, err := w.CreateFormFile("media", path)
if err != nil {
return mediaId, err
}
_, err = io.Copy(fw, f)
if err != nil {
return mediaId, err
}
w.Close()
url := fmt.Sprintf(UPLOAD_IMAGE_ENDPOINT+"?access_token=%s&type=image", token)
request, err := http.NewRequest(http.MethodPost, url, &b)
if err != nil {
return mediaId, err
}
request.Header.Add("Content-Type", w.FormDataContentType())
request.Header.Add("User-Agent", "Grafana")
resp, err := ctxhttp.Do(context.TODO(), http.DefaultClient, request)
if err != nil {
return mediaId, err
}
if resp.StatusCode/100 != 2 {
return mediaId, fmt.Errorf("WeChat returned statuscode invalid status code: %v", resp.Status)
}
defer resp.Body.Close()
var wechatMediaId WeChatMediaId
err = json.NewDecoder(resp.Body).Decode(&wechatMediaId)
if err != nil {
return mediaId, err
}
if wechatMediaId.ErrCode != 0 {
return mediaId, fmt.Errorf("WeChat returned errmsg: %s", wechatMediaId.ErrMsg)
}
return wechatMediaId.MediaId, nil
}
func (this *WeChatNotifier) GetAccessToken() (string, error) {
var token string
url := fmt.Sprintf(GET_TOKEN_ENDPOINT+"?corpid=%s&corpsecret=%s", this.CorpId, this.Secret)
request, err := http.NewRequest(http.MethodPost, url, nil)
if err != nil {
return token, err
}
request.Header.Add("Content-Type", "application/json")
request.Header.Add("User-Agent", "Grafana")
resp, err := ctxhttp.Do(context.TODO(), http.DefaultClient, request)
if err != nil {
return token, err
}
if resp.StatusCode/100 != 2 {
return token, fmt.Errorf("WeChat returned statuscode invalid status code: %v", resp.Status)
}
defer resp.Body.Close()
var wechatToken WeChatToken
err = json.NewDecoder(resp.Body).Decode(&wechatToken)
if err != nil {
return token, err
}
if wechatToken.ErrCode != 0 {
return token, fmt.Errorf("WeChat returned errmsg: %s", wechatToken.ErrMsg)
}
return wechatToken.AccessToken, nil
}
func (this *WeChatNotifier) PushImage(evalContext *alerting.EvalContext, token string) error {
mediaId, err := this.GetMediaId(evalContext.ImageOnDiskPath, token)
if err != nil {
return err
}
bodyJSON, err := simplejson.NewJson([]byte(`{
"touser": "` + this.ToUser + `",
"msgtype" : "image",
"agentid": "` + this.AgentId + `",
"image" : {
"media_id": "` + mediaId + `"
}
}`))
if err != nil {
this.log.Error("Failed to create Json data", "error", err, "wechat", this.Name)
return err
}
body, _ := bodyJSON.MarshalJSON()
url := fmt.Sprintf(SEND_MESSAGE_ENDPOINT+"?access_token=%s", token)
cmd := &m.SendWebhookSync{
Url: url,
Body: string(body),
}
if err := bus.DispatchCtx(evalContext.Ctx, cmd); err != nil {
this.log.Error("Failed to send WeChat", "error", err, "wechat", this.Name)
return err
}
return nil
}
func (this *WeChatNotifier) Notify(evalContext *alerting.EvalContext) error {
this.log.Info("Sending wechat")
token, err := this.GetAccessToken()
if err != nil {
this.log.Error("Get AccessToken failed", err)
return err
}
content := evalContext.GetNotificationTitle()
content += "\\n\\n"
if evalContext.Rule.State != m.AlertStateOK {
content += "Message:\\n " + evalContext.Rule.Message + "\\n\\n"
}
for index, evt := range evalContext.EvalMatches {
if index == 0 {
content += "Metric:\\n"
}
if index > 4 {
content += " ...\\n"
break
}
content += " " + evt.Metric + "=" + strconv.FormatFloat(evt.Value.Float64, 'f', -1, 64) + "\\n"
}
content += "\\n"
if evalContext.Error != nil {
content += "Error:\\n " + evalContext.Error.Error() + "\\n\\n"
}
if evalContext.ImageOnDiskPath == "" && evalContext.ImagePublicURL != "" {
content += "ImageUrl:\\n " + evalContext.ImagePublicURL + "\\n"
}
bodyJSON, err := simplejson.NewJson([]byte(`{
"touser": "` + this.ToUser + `",
"msgtype" : "text",
"agentid": "` + this.AgentId + `",
"text" : {
"content": "` + content + `"
}
}`))
if err != nil {
this.log.Error("Failed to create Json data", "error", err, "wechat", this.Name)
return err
}
body, _ := bodyJSON.MarshalJSON()
url := fmt.Sprintf(SEND_MESSAGE_ENDPOINT+"?access_token=%s", token)
cmd := &m.SendWebhookSync{
Url: url,
Body: string(body),
}
if err := bus.DispatchCtx(evalContext.Ctx, cmd); err != nil {
this.log.Error("Failed to send WeChat", "error", err, "wechat", this.Name)
return err
}
if evalContext.ImageOnDiskPath != "" {
err := this.PushImage(evalContext, token)
if err != nil {
this.log.Error("Failed to Push Image", "error", err, "path", evalContext.ImageOnDiskPath)
}
}
return nil
}
|
