package slack import ( "context" "encoding/json" "net/url" "strings" ) const ( DEFAULT_MESSAGE_USERNAME = "" DEFAULT_MESSAGE_REPLY_BROADCAST = false DEFAULT_MESSAGE_ASUSER = false DEFAULT_MESSAGE_PARSE = "" DEFAULT_MESSAGE_THREAD_TIMESTAMP = "" DEFAULT_MESSAGE_LINK_NAMES = 0 DEFAULT_MESSAGE_UNFURL_LINKS = false DEFAULT_MESSAGE_UNFURL_MEDIA = true DEFAULT_MESSAGE_ICON_URL = "" DEFAULT_MESSAGE_ICON_EMOJI = "" DEFAULT_MESSAGE_MARKDOWN = true DEFAULT_MESSAGE_ESCAPE_TEXT = true ) type chatResponseFull struct { Channel string `json:"channel"` Timestamp string `json:"ts"` //Regualr message timestamp MessageTimeStamp string `json:"message_ts"` //Ephemeral message timestamp Text string `json:"text"` SlackResponse } // getMessageTimestamp will inspect the `chatResponseFull` to ruturn a timestamp value // in `chat.postMessage` its under `ts` // in `chat.postEphemeral` its under `message_ts` func (c chatResponseFull) getMessageTimestamp() string { if len(c.Timestamp) > 0 { return c.Timestamp } return c.MessageTimeStamp } // PostMessageParameters contains all the parameters necessary (including the optional ones) for a PostMessage() request type PostMessageParameters struct { Username string `json:"username"` AsUser bool `json:"as_user"` Parse string `json:"parse"` ThreadTimestamp string `json:"thread_ts"` ReplyBroadcast bool `json:"reply_broadcast"` LinkNames int `json:"link_names"` Attachments []Attachment `json:"attachments"` UnfurlLinks bool `json:"unfurl_links"` UnfurlMedia bool `json:"unfurl_media"` IconURL string `json:"icon_url"` IconEmoji string `json:"icon_emoji"` Markdown bool `json:"mrkdwn,omitempty"` EscapeText bool `json:"escape_text"` // chat.postEphemeral support Channel string `json:"channel"` User string `json:"user"` } // NewPostMessageParameters provides an instance of PostMessageParameters with all the sane default values set func NewPostMessageParameters() PostMessageParameters { return PostMessageParameters{ Username: DEFAULT_MESSAGE_USERNAME, User: DEFAULT_MESSAGE_USERNAME, AsUser: DEFAULT_MESSAGE_ASUSER, Parse: DEFAULT_MESSAGE_PARSE, ThreadTimestamp: DEFAULT_MESSAGE_THREAD_TIMESTAMP, LinkNames: DEFAULT_MESSAGE_LINK_NAMES, Attachments: nil, UnfurlLinks: DEFAULT_MESSAGE_UNFURL_LINKS, UnfurlMedia: DEFAULT_MESSAGE_UNFURL_MEDIA, IconURL: DEFAULT_MESSAGE_ICON_URL, IconEmoji: DEFAULT_MESSAGE_ICON_EMOJI, Markdown: DEFAULT_MESSAGE_MARKDOWN, EscapeText: DEFAULT_MESSAGE_ESCAPE_TEXT, } } // DeleteMessage deletes a message in a channel func (api *Client) DeleteMessage(channel, messageTimestamp string) (string, string, error) { respChannel, respTimestamp, _, err := api.SendMessageContext(context.Background(), channel, MsgOptionDelete(messageTimestamp)) return respChannel, respTimestamp, err } // DeleteMessageContext deletes a message in a channel with a custom context func (api *Client) DeleteMessageContext(ctx context.Context, channel, messageTimestamp string) (string, string, error) { respChannel, respTimestamp, _, err := api.SendMessageContext(ctx, channel, MsgOptionDelete(messageTimestamp)) return respChannel, respTimestamp, err } // PostMessage sends a message to a channel. // Message is escaped by default according to https://api.slack.com/docs/formatting // Use http://davestevens.github.io/slack-message-builder/ to help crafting your message. func (api *Client) PostMessage(channel, text string, params PostMessageParameters) (string, string, error) { respChannel, respTimestamp, _, err := api.SendMessageContext( context.Background(), channel, MsgOptionText(text, params.EscapeText), MsgOptionAttachments(params.Attachments...), MsgOptionPostMessageParameters(params), ) return respChannel, respTimestamp, err } // PostMessageContext sends a message to a channel with a custom context // For more details, see PostMessage documentation func (api *Client) PostMessageContext(ctx context.Context, channel, text string, params PostMessageParameters) (string, string, error) { respChannel, respTimestamp, _, err := api.SendMessageContext( ctx, channel, MsgOptionText(text, params.EscapeText), MsgOptionAttachments(params.Attachments...), MsgOptionPostMessageParameters(params), ) return respChannel, respTimestamp, err } // PostEphemeral sends an ephemeral message to a user in a channel. // Message is escaped by default according to https://api.slack.com/docs/formatting // Use http://davestevens.github.io/slack-message-builder/ to help crafting your message. func (api *Client) PostEphemeral(channelID, userID string, options ...MsgOption) (string, error) { return api.PostEphemeralContext( context.Background(), channelID, userID, options..., ) } // PostEphemeralContext sends an ephemeal message to a user in a channel with a custom context // For more details, see PostEphemeral documentation func (api *Client) PostEphemeralContext(ctx context.Context, channelID, userID string, options ...MsgOption) (timestamp string, err error) { _, timestamp, _, err = api.SendMessageContext(ctx, channelID, append(options, MsgOptionPostEphemeral2(userID))...) return timestamp, err } // UpdateMessage updates a message in a channel func (api *Client) UpdateMessage(channelID, timestamp, text string) (string, string, string, error) { return api.UpdateMessageContext(context.Background(), channelID, timestamp, text) } // UpdateMessageContext updates a message in a channel func (api *Client) UpdateMessageContext(ctx context.Context, channelID, timestamp, text string) (string, string, string, error) { return api.SendMessageContext(ctx, channelID, MsgOptionUpdate(timestamp), MsgOptionText(text, true)) } // SendMessage more flexible method for configuring messages. func (api *Client) SendMessage(channel string, options ...MsgOption) (string, string, string, error) { return api.SendMessageContext(context.Background(), channel, options...) } // SendMessageContext more flexible method for configuring messages with a custom context. func (api *Client) SendMessageContext(ctx context.Context, channelID string, options ...MsgOption) (channel string, timestamp string, text string, err error) { var ( config sendConfig response chatResponseFull ) if config, err = applyMsgOptions(api.token, channelID, options...); err != nil { return "", "", "", err } if err = postSlackMethod(ctx, api.httpclient, string(config.mode), config.values, &response, api.debug); err != nil { return "", "", "", err } return response.Channel, response.getMessageTimestamp(), response.Text, response.Err() } // ApplyMsgOptions utility function for debugging/testing chat requests. func ApplyMsgOptions(token, channel string, options ...MsgOption) (string, url.Values, error) { config, err := applyMsgOptions(token, channel, options...) return string(config.mode), config.values, err } func applyMsgOptions(token, channel string, options ...MsgOption) (sendConfig, error) { config := sendConfig{ mode: chatPostMessage, values: url.Values{ "token": {token}, "channel": {channel}, }, } for _, opt := range options { if err := opt(&config); err != nil { return config, err } } return config, nil } func escapeMessage(message string) string { replacer := strings.NewReplacer("&", "&", "<", "<", ">", ">") return replacer.Replace(message) } type sendMode string const ( chatUpdate sendMode = "chat.update" chatPostMessage sendMode = "chat.postMessage" chatDelete sendMode = "chat.delete" chatPostEphemeral sendMode = "chat.postEphemeral" chatMeMessage sendMode = "chat.meMessage" ) type sendConfig struct { mode sendMode values url.Values } // MsgOption option provided when sending a message. type MsgOption func(*sendConfig) error // MsgOptionPost posts a messages, this is the default. func MsgOptionPost() MsgOption { return func(config *sendConfig) error { config.mode = chatPostMessage config.values.Del("ts") return nil } } // MsgOptionPostEphemeral - DEPRECATED: use MsgOptionPostEphemeral2 // posts an ephemeral message. func MsgOptionPostEphemeral() MsgOption { return func(config *sendConfig) error { config.mode = chatPostEphemeral config.values.Del("ts") return nil } } // MsgOptionPostEphemeral2 - posts an ephemeral message to the provided user. func MsgOptionPostEphemeral2(userID string) MsgOption { return func(config *sendConfig) error { config.mode = chatPostEphemeral MsgOptionUser(userID)(config) config.values.Del("ts") return nil } } // MsgOptionMeMessage posts a "me message" type from the calling user func MsgOptionMeMessage() MsgOption { return func(config *sendConfig) error { config.mode = chatMeMessage return nil } } // MsgOptionUpdate updates a message based on the timestamp. func MsgOptionUpdate(timestamp string) MsgOption { return func(config *sendConfig) error { config.mode = chatUpdate config.values.Add("ts", timestamp) return nil } } // MsgOptionDelete deletes a message based on the timestamp. func MsgOptionDelete(timestamp string) MsgOption { return func(config *sendConfig) error { config.mode = chatDelete config.values.Add("ts", timestamp) return nil } } // MsgOptionAsUser whether or not to send the message as the user. func MsgOptionAsUser(b bool) MsgOption { return func(config *sendConfig) error { if b != DEFAULT_MESSAGE_ASUSER { config.values.Set("as_user", "true") } return nil } } // MsgOptionUser set the user for the message. func MsgOptionUser(userID string) MsgOption { return func(config *sendConfig) error { config.values.Set("user", userID) return nil } } // MsgOptionText provide the text for the message, optionally escape the provided // text. func MsgOptionText(text string, escape bool) MsgOption { return func(config *sendConfig) error { if escape { text = escapeMessage(text) } config.values.Add("text", text) return nil } } // MsgOptionAttachments provide attachments for the message. func MsgOptionAttachments(attachments ...Attachment) MsgOption { return func(config *sendConfig) error { if attachments == nil { return nil } attachments, err := json.Marshal(attachments) if err == nil { config.values.Set("attachments", string(attachments)) } return err } } // MsgOptionEnableLinkUnfurl enables link unfurling func MsgOptionEnableLinkUnfurl() MsgOption { return func(config *sendConfig) error { config.values.Set("unfurl_links", "true") return nil } } // MsgOptionDisableLinkUnfurl disables link unfurling func MsgOptionDisableLinkUnfurl() MsgOption { return func(config *sendConfig) error { config.values.Set("unfurl_links", "false") return nil } } // MsgOptionDisableMediaUnfurl disables media unfurling. func MsgOptionDisableMediaUnfurl() MsgOption { return func(config *sendConfig) error { config.values.Set("unfurl_media", "false") return nil } } // MsgOptionDisableMarkdown disables markdown. func MsgOptionDisableMarkdown() MsgOption { return func(config *sendConfig) error { config.values.Set("mrkdwn", "false") return nil } } // MsgOptionTS sets the thread TS of the message to enable creating or replying to a thread func MsgOptionTS(ts string) MsgOption { return func(config *sendConfig) error { config.values.Set("thread_ts", ts) return nil } } // MsgOptionBroadcast sets reply_broadcast to true func MsgOptionBroadcast() MsgOption { return func(config *sendConfig) error { config.values.Set("reply_broadcast", "true") return nil } } // this function combines multiple options into a single option. func MsgOptionCompose(options ...MsgOption) MsgOption { return func(c *sendConfig) error { for _, opt := range options { if err := opt(c); err != nil { return err } } return nil } } func MsgOptionParse(b bool) MsgOption { return func(c *sendConfig) error { var v string if b { v = "1" } else { v = "0" } c.values.Set("parse", v) return nil } } // MsgOptionPostMessageParameters maintain backwards compatibility. func MsgOptionPostMessageParameters(params PostMessageParameters) MsgOption { return func(config *sendConfig) error { if params.Username != DEFAULT_MESSAGE_USERNAME { config.values.Set("username", params.Username) } // chat.postEphemeral support if params.User != DEFAULT_MESSAGE_USERNAME { config.values.Set("user", params.User) } // never generates an error. MsgOptionAsUser(params.AsUser)(config) if params.Parse != DEFAULT_MESSAGE_PARSE { config.values.Set("parse", params.Parse) } if params.LinkNames != DEFAULT_MESSAGE_LINK_NAMES { config.values.Set("link_names", "1") } if params.UnfurlLinks != DEFAULT_MESSAGE_UNFURL_LINKS { config.values.Set("unfurl_links", "true") } // I want to send a message with explicit `as_user` `true` and `unfurl_links` `false` in request. // Because setting `as_user` to `true` will change the default value for `unfurl_links` to `true` on Slack API side. if params.AsUser != DEFAULT_MESSAGE_ASUSER && params.UnfurlLinks == DEFAULT_MESSAGE_UNFURL_LINKS { config.values.Set("unfurl_links", "false") } if params.UnfurlMedia != DEFAULT_MESSAGE_UNFURL_MEDIA { config.values.Set("unfurl_media", "false") } if params.IconURL != DEFAULT_MESSAGE_ICON_URL { config.values.Set("icon_url", params.IconURL) } if params.IconEmoji != DEFAULT_MESSAGE_ICON_EMOJI { config.values.Set("icon_emoji", params.IconEmoji) } if params.Markdown != DEFAULT_MESSAGE_MARKDOWN { config.values.Set("mrkdwn", "false") } if params.ThreadTimestamp != DEFAULT_MESSAGE_THREAD_TIMESTAMP { config.values.Set("thread_ts", params.ThreadTimestamp) } if params.ReplyBroadcast != DEFAULT_MESSAGE_REPLY_BROADCAST { config.values.Set("reply_broadcast", "true") } return nil } }