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chat.go
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chat.go
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package slack
import (
"encoding/json"
"errors"
"net/url"
"strings"
)
const (
DEFAULT_MESSAGE_USERNAME = ""
DEFAULT_MESSAGE_PARSE = ""
DEFAULT_MESSAGE_LINK_NAMES = 0
DEFAULT_MESSAGE_UNFURL_LINKS = true
DEFAULT_MESSAGE_UNFURL_MEDIA = false
DEFAULT_MESSAGE_ICON_URL = ""
DEFAULT_MESSAGE_ICON_EMOJI = ""
)
type chatResponseFull struct {
ChannelId string `json:"channel"`
Timestamp string `json:"ts"`
Text string `json:"text"`
SlackResponse
}
// AttachmentField contains information for an attachment field
// An Attachment can contain multiple of these
type AttachmentField struct {
Title string `json:"title"`
Value string `json:"value"`
Short bool `json:"short"`
}
// Attachment contains all the information for an attachment
type Attachment struct {
Fallback string `json:"fallback"`
Color string `json:"color,omitempty"`
Pretext string `json:"pretext,omitempty"`
AuthorName string `json:"author_name,omitempty"`
AuthorLink string `json:"author_link,omitempty"`
AuthorIcon string `json:"author_icon,omitempty"`
Title string `json:"title,omitempty"`
TitleLink string `json:"title_link,omitempty"`
Text string `json:"text"`
ImageURL string `json:"image_url,omitempty"`
Fields []AttachmentField `json:"fields,omitempty"`
}
// PostMessageParameters contains all the parameters necessary (including the optional ones) for a PostMessage() request
type PostMessageParameters struct {
Text string
Username string
AsUser bool `json:"as_user,omitempty"`
Parse string
LinkNames int
Attachments []Attachment
UnfurlLinks bool
UnfurlMedia bool
IconURL string
IconEmoji string
}
// NewPostMessageParameters provides an instance of PostMessageParameters with all the sane default values set
func NewPostMessageParameters() PostMessageParameters {
return PostMessageParameters{
Username: DEFAULT_MESSAGE_USERNAME,
Parse: DEFAULT_MESSAGE_PARSE,
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,
}
}
func chatRequest(path string, values url.Values, debug bool) (*chatResponseFull, error) {
response := &chatResponseFull{}
err := parseResponse(path, values, response, debug)
if err != nil {
return nil, err
}
if !response.Ok {
return nil, errors.New(response.Error)
}
return response, nil
}
// DeleteMessage deletes a message in a channel
func (api *Slack) DeleteMessage(channelId, messageTimestamp string) (string, string, error) {
values := url.Values{
"token": {api.config.token},
"channel": {channelId},
"ts": {messageTimestamp},
}
response, err := chatRequest("chat.delete", values, api.debug)
if err != nil {
return "", "", err
}
return response.ChannelId, response.Timestamp, nil
}
func escapeMessage(message string) string {
/*
& replaced with &
< replaced with <
> replaced with >
*/
replacer := strings.NewReplacer("&", "&", "<", "<", ">", ">")
return replacer.Replace(message)
}
// PostMessage sends a message to a channel
// Message is automatically escaped according to https://api.slack.com/docs/formatting
func (api *Slack) PostMessage(channelId string, text string, params PostMessageParameters) (channel string, timestamp string, err error) {
values := url.Values{
"token": {api.config.token},
"channel": {channelId},
"text": {escapeMessage(text)},
}
if params.Username != DEFAULT_MESSAGE_USERNAME {
values.Set("username", string(params.Username))
}
if params.Parse != DEFAULT_MESSAGE_PARSE {
values.Set("parse", string(params.Parse))
}
if params.LinkNames != DEFAULT_MESSAGE_LINK_NAMES {
values.Set("link_names", "1")
}
if params.Attachments != nil {
attachments, err := json.Marshal(params.Attachments)
if err != nil {
return "", "", err
}
values.Set("attachments", string(attachments))
}
if params.UnfurlLinks == DEFAULT_MESSAGE_UNFURL_LINKS {
values.Set("unfurl_links", "false")
}
if params.UnfurlMedia != DEFAULT_MESSAGE_UNFURL_MEDIA {
values.Set("unfurl_media", "true")
}
if params.IconURL != DEFAULT_MESSAGE_ICON_URL {
values.Set("icon_url", params.IconURL)
}
if params.IconEmoji != DEFAULT_MESSAGE_ICON_EMOJI {
values.Set("icon_emoji", params.IconEmoji)
}
response, err := chatRequest("chat.postMessage", values, api.debug)
if err != nil {
return "", "", err
}
return response.ChannelId, response.Timestamp, nil
}
// UpdateMessage updates a message in a channel
func (api *Slack) UpdateMessage(channelId, timestamp, text string) (string, string, string, error) {
values := url.Values{
"token": {api.config.token},
"channel": {channelId},
"text": {escapeMessage(text)},
"ts": {timestamp},
}
response, err := chatRequest("chat.update", values, api.debug)
if err != nil {
return "", "", "", err
}
return response.ChannelId, response.Timestamp, response.Text, nil
}