|
| 1 | +package lark |
| 2 | + |
| 3 | +import ( |
| 4 | + "bytes" |
| 5 | + "crypto/hmac" |
| 6 | + "crypto/sha256" |
| 7 | + "encoding/base64" |
| 8 | + "encoding/json" |
| 9 | + "errors" |
| 10 | + "fmt" |
| 11 | + "io" |
| 12 | + "net/http" |
| 13 | + "net/url" |
| 14 | + "strconv" |
| 15 | + "time" |
| 16 | + |
| 17 | + "github.com/containrrr/shoutrrr/pkg/format" |
| 18 | + "github.com/containrrr/shoutrrr/pkg/services/standard" |
| 19 | + "github.com/containrrr/shoutrrr/pkg/types" |
| 20 | +) |
| 21 | + |
| 22 | +const ( |
| 23 | + apiFormat = "https://%s/open-apis/bot/v2/hook/%s" |
| 24 | + maxLength = 4096 |
| 25 | + defaultTime = 30 * time.Second |
| 26 | +) |
| 27 | + |
| 28 | +type Service struct { |
| 29 | + standard.Standard |
| 30 | + config *Config |
| 31 | + pkr format.PropKeyResolver |
| 32 | +} |
| 33 | + |
| 34 | +var ( |
| 35 | + ErrInvalidHost = errors.New("invalid host, use 'open.larksuite.com' or 'open.feishu.cn'") |
| 36 | + ErrNoPath = errors.New("no path, path like 'xxx' in 'https://open.larksuite.com/open-apis/bot/v2/hook/xxx'") |
| 37 | + ErrLargeMessage = errors.New("message exceeds the max length") |
| 38 | + |
| 39 | + httpClient = &http.Client{Timeout: defaultTime} |
| 40 | +) |
| 41 | + |
| 42 | +const ( |
| 43 | + larkHost = "open.larksuite.com" |
| 44 | + feishuHost = "open.feishu.com" |
| 45 | +) |
| 46 | + |
| 47 | +// Send notification to Lark |
| 48 | +func (service *Service) Send(message string, params *types.Params) error { |
| 49 | + if len(message) > maxLength { |
| 50 | + return ErrLargeMessage |
| 51 | + } |
| 52 | + |
| 53 | + config := *service.config |
| 54 | + if err := service.pkr.UpdateConfigFromParams(&config, params); err != nil { |
| 55 | + return err |
| 56 | + } |
| 57 | + |
| 58 | + if config.Host != larkHost && config.Host != feishuHost { |
| 59 | + return ErrInvalidHost |
| 60 | + } |
| 61 | + |
| 62 | + if config.Path == "" { |
| 63 | + return ErrNoPath |
| 64 | + } |
| 65 | + |
| 66 | + return service.sendMessage(message, config) |
| 67 | +} |
| 68 | + |
| 69 | +// Initialize loads ServiceConfig from configURL and sets logger for this Service |
| 70 | +func (service *Service) Initialize(configURL *url.URL, logger types.StdLogger) error { |
| 71 | + service.Logger.SetLogger(logger) |
| 72 | + service.config = &Config{} |
| 73 | + service.pkr = format.NewPropKeyResolver(service.config) |
| 74 | + if err := service.config.setURL(&service.pkr, configURL); err != nil { |
| 75 | + return err |
| 76 | + } |
| 77 | + return nil |
| 78 | +} |
| 79 | + |
| 80 | +func (service *Service) genSign(secret string, timestamp int64) string { |
| 81 | + //timestamp + key calculate sha256, then base64 encode |
| 82 | + stringToSign := fmt.Sprintf("%v", timestamp) + "\n" + secret |
| 83 | + |
| 84 | + var data []byte |
| 85 | + h := hmac.New(sha256.New, []byte(stringToSign)) |
| 86 | + h.Write(data) |
| 87 | + signature := base64.StdEncoding.EncodeToString(h.Sum(nil)) |
| 88 | + return signature |
| 89 | +} |
| 90 | + |
| 91 | +func (service *Service) sendMessage(message string, cfg Config) error { |
| 92 | + url := fmt.Sprintf(apiFormat, cfg.Host, cfg.Path) |
| 93 | + body := service.getRequestBody(message, cfg.Title, cfg.Secret) |
| 94 | + data, err := json.Marshal(body) |
| 95 | + if err != nil { |
| 96 | + return err |
| 97 | + } |
| 98 | + service.Logf("Lark Request Body: %s", string(data)) |
| 99 | + req, err := http.NewRequest(http.MethodPost, url, bytes.NewReader(data)) |
| 100 | + if err != nil { |
| 101 | + return err |
| 102 | + } |
| 103 | + req.Header.Set("Content-Type", "application/json") |
| 104 | + resp, err := httpClient.Do(req) |
| 105 | + if err != nil { |
| 106 | + return err |
| 107 | + } |
| 108 | + defer resp.Body.Close() |
| 109 | + data, err = io.ReadAll(resp.Body) |
| 110 | + if err != nil { |
| 111 | + return err |
| 112 | + } |
| 113 | + response := Response{} |
| 114 | + if err := json.Unmarshal(data, &response); err != nil { |
| 115 | + return err |
| 116 | + } |
| 117 | + if response.Code == 0 { |
| 118 | + return nil |
| 119 | + } |
| 120 | + return fmt.Errorf("code: %d, msg: %s", response.Code, response.Msg) |
| 121 | +} |
| 122 | + |
| 123 | +func (service *Service) getRequestBody(message, title, secret string) *RequestBody { |
| 124 | + body := &RequestBody{} |
| 125 | + if secret != "" { |
| 126 | + ts := time.Now().Unix() |
| 127 | + body.Timestamp = strconv.FormatInt(ts, 10) |
| 128 | + body.Sign = service.genSign(secret, ts) |
| 129 | + } |
| 130 | + if title == "" { |
| 131 | + body.MsgType = MsgTypeText |
| 132 | + body.Content.Text = message |
| 133 | + return body |
| 134 | + } |
| 135 | + body.MsgType = MsgTypePost |
| 136 | + body.Content.Post = &Post{ |
| 137 | + En: &Message{ |
| 138 | + Title: title, |
| 139 | + Content: [][]Item{{ |
| 140 | + {Tag: TagValueText, Text: message}, |
| 141 | + }}, |
| 142 | + }, |
| 143 | + } |
| 144 | + return body |
| 145 | +} |
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