1 package pushover
2 
3 import (
4 	"encoding/json"
5 	"fmt"
6 	"net/http"
7 	"net/url"
8 	"strings"
9 )
10 
11 const apiurl = "https://api.pushover.net/1/messages.json"
12 const MaxMsgLength = 1024
13 const MaxTitleLength = 250
14 
15 // Message represents a message in the Pushover Message API.
16 type Message struct {
17 	User string
18 	Token string
19 	Title string
20 	Message string
21 	Priority int
22 }
23 
24 type response struct {
25 	Status int
26 	Request string
27 	Errors errors
28 }
29 
30 type errors []string
31 
32 func (e errors) Error() string {
33 	return strings.Join(e, ", ")
34 }
35 
36 func (m *Message) validate() error {
37 	nchar := strings.Count(m.Message, "")
38 	if nchar > MaxMsgLength {
39 		return fmt.Errorf("%d character message too long, allowed %d characters", nchar, MaxMsgLength)
40 	}
41 	nchar = strings.Count(m.Title, "")
42 	if nchar > MaxTitleLength {
43 		return fmt.Errorf("%d-character title too long, allowed %d characters", nchar, MaxTitleLength)
44 	}
45 	return nil
46 }
47 
48 // Push sends the Message m to Pushover.
49 func Push(m Message) error {
50 	if err := m.validate(); err != nil {
51 		return err
52 	}
53 	req := url.Values{}
54 	req.Add("token", m.Token)
55 	req.Add("user", m.User)
56 	req.Add("title", m.Title)
57 	req.Add("message", m.Message)
58 	resp, err := http.PostForm(apiurl, req)
59 	if err != nil {
60 		return err
61 	}
62 	defer resp.Body.Close()
63 	if resp.StatusCode == http.StatusOK {
64 		return nil
65 	}
66 
67 	var presp response
68 	if err := json.NewDecoder(resp.Body).Decode(&presp); err != nil {
69 		return fmt.Errorf("decode error response: %v", err)
70 	}
71 	return presp.Errors
72 }