mirror of
https://github.com/prometheus/alertmanager
synced 2024-12-25 15:42:18 +00:00
7d21f5a5a9
Signed-off-by: johncming <johncming@yahoo.com>
202 lines
5.3 KiB
Go
202 lines
5.3 KiB
Go
// Copyright 2019 Prometheus Team
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package wechat
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import (
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"bytes"
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"context"
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"encoding/json"
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"fmt"
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"io/ioutil"
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"net/http"
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"net/url"
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"time"
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"github.com/go-kit/kit/log"
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"github.com/go-kit/kit/log/level"
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"github.com/pkg/errors"
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commoncfg "github.com/prometheus/common/config"
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"github.com/prometheus/alertmanager/config"
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"github.com/prometheus/alertmanager/notify"
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"github.com/prometheus/alertmanager/template"
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"github.com/prometheus/alertmanager/types"
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)
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// Notifier implements a Notifier for wechat notifications.
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type Notifier struct {
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conf *config.WechatConfig
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tmpl *template.Template
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logger log.Logger
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client *http.Client
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accessToken string
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accessTokenAt time.Time
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}
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// token is the AccessToken with corpid and corpsecret.
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type token struct {
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AccessToken string `json:"access_token"`
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}
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type weChatMessage struct {
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Text weChatMessageContent `yaml:"text,omitempty" json:"text,omitempty"`
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ToUser string `yaml:"touser,omitempty" json:"touser,omitempty"`
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ToParty string `yaml:"toparty,omitempty" json:"toparty,omitempty"`
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Totag string `yaml:"totag,omitempty" json:"totag,omitempty"`
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AgentID string `yaml:"agentid,omitempty" json:"agentid,omitempty"`
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Safe string `yaml:"safe,omitempty" json:"safe,omitempty"`
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Type string `yaml:"msgtype,omitempty" json:"msgtype,omitempty"`
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}
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type weChatMessageContent struct {
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Content string `json:"content"`
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}
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type weChatResponse struct {
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Code int `json:"code"`
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Error string `json:"error"`
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}
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// New returns a new Wechat notifier.
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func New(c *config.WechatConfig, t *template.Template, l log.Logger) (*Notifier, error) {
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client, err := commoncfg.NewClientFromConfig(*c.HTTPConfig, "wechat", false)
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if err != nil {
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return nil, err
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}
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return &Notifier{conf: c, tmpl: t, logger: l, client: client}, nil
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}
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// Notify implements the Notifier interface.
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func (n *Notifier) Notify(ctx context.Context, as ...*types.Alert) (bool, error) {
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key, err := notify.ExtractGroupKey(ctx)
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if err != nil {
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return false, err
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}
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level.Debug(n.logger).Log("incident", key)
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data := notify.GetTemplateData(ctx, n.tmpl, as, n.logger)
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tmpl := notify.TmplText(n.tmpl, data, &err)
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if err != nil {
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return false, err
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}
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// Refresh AccessToken over 2 hours
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if n.accessToken == "" || time.Since(n.accessTokenAt) > 2*time.Hour {
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parameters := url.Values{}
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parameters.Add("corpsecret", tmpl(string(n.conf.APISecret)))
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parameters.Add("corpid", tmpl(string(n.conf.CorpID)))
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if err != nil {
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return false, fmt.Errorf("templating error: %s", err)
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}
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u := n.conf.APIURL.Copy()
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u.Path += "gettoken"
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u.RawQuery = parameters.Encode()
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req, err := http.NewRequest(http.MethodGet, u.String(), nil)
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if err != nil {
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return true, err
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}
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req.Header.Set("Content-Type", "application/json")
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resp, err := n.client.Do(req.WithContext(ctx))
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if err != nil {
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return true, notify.RedactURL(err)
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}
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defer notify.Drain(resp)
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var wechatToken token
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if err := json.NewDecoder(resp.Body).Decode(&wechatToken); err != nil {
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return false, err
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}
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if wechatToken.AccessToken == "" {
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return false, fmt.Errorf("invalid APISecret for CorpID: %s", n.conf.CorpID)
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}
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// Cache accessToken
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n.accessToken = wechatToken.AccessToken
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n.accessTokenAt = time.Now()
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}
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msg := &weChatMessage{
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Text: weChatMessageContent{
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Content: tmpl(n.conf.Message),
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},
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ToUser: tmpl(n.conf.ToUser),
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ToParty: tmpl(n.conf.ToParty),
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Totag: tmpl(n.conf.ToTag),
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AgentID: tmpl(n.conf.AgentID),
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Type: "text",
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Safe: "0",
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}
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if err != nil {
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return false, fmt.Errorf("templating error: %s", err)
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}
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var buf bytes.Buffer
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if err := json.NewEncoder(&buf).Encode(msg); err != nil {
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return false, err
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}
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postMessageURL := n.conf.APIURL.Copy()
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postMessageURL.Path += "message/send"
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q := postMessageURL.Query()
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q.Set("access_token", n.accessToken)
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postMessageURL.RawQuery = q.Encode()
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req, err := http.NewRequest(http.MethodPost, postMessageURL.String(), &buf)
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if err != nil {
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return true, err
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}
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resp, err := n.client.Do(req.WithContext(ctx))
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if err != nil {
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return true, notify.RedactURL(err)
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}
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defer notify.Drain(resp)
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if resp.StatusCode != 200 {
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return true, fmt.Errorf("unexpected status code %v", resp.StatusCode)
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}
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body, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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return true, err
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}
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level.Debug(n.logger).Log("response", string(body), "incident", key)
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var weResp weChatResponse
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if err := json.Unmarshal(body, &weResp); err != nil {
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return true, err
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}
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// https://work.weixin.qq.com/api/doc#10649
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if weResp.Code == 0 {
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return false, nil
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}
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// AccessToken is expired
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if weResp.Code == 42001 {
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n.accessToken = ""
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return true, errors.New(weResp.Error)
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}
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return false, errors.New(weResp.Error)
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}
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