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slack.go
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slack.go
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// Copyright 2015 Bowery, Inc.
package slack
import (
"encoding/json"
"errors"
"fmt"
"net/http"
"net/url"
)
var (
slackAddr = "https://slack.com/api"
)
const (
postMessageURI = "chat.postMessage"
)
type slackPostMessageRes struct {
Ok bool
Error string
}
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,omitempty"`
Fields []AttachmentField `json:"fields,omitempty"`
ImageURL string `json:"image_url,omitempty"`
ThumbURL string `json:"thumb_url,omitempty"`
}
type AttachmentField struct {
Title string `json:"title,omitempty"`
Value string `json:"value,omitempty"`
Short bool `json:"short,omitempty"`
}
// Client represents a slack api client. A Client is
// used for making requests to the slack api.
type Client struct {
token string
username string
icon string
}
// NewClient returns a Client with the provided api token.
func NewClient(token, username, icon string) *Client {
return &Client{token, username, icon}
}
// SendMessage sends a text message to a specific channel
// with a specific username.
func (c *Client) SendMessage(channel, message string, attachments []Attachment) error {
if channel == "" {
return errors.New("channel required")
}
payload := url.Values{}
payload.Set("token", c.token)
payload.Set("username", c.username)
payload.Set("icon_emoji", c.icon)
payload.Set("channel", channel)
payload.Set("text", message)
if attachments != nil {
d, err := json.Marshal(attachments)
if err != nil {
return err
}
payload.Set("attachments", string(d))
}
res, err := http.PostForm(fmt.Sprintf("%s/%s", slackAddr, postMessageURI), payload)
if err != nil {
return err
}
defer res.Body.Close()
resBody := new(slackPostMessageRes)
decoder := json.NewDecoder(res.Body)
err = decoder.Decode(resBody)
if err != nil {
return err
}
if !resBody.Ok {
return errors.New(resBody.Error)
}
return nil
}