-
Notifications
You must be signed in to change notification settings - Fork 579
/
discord.go
237 lines (201 loc) · 6.45 KB
/
discord.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
// Package discord implements the OAuth2 protocol for authenticating users through Discord.
// This package can be used as a reference implementation of an OAuth2 provider for Discord.
package discord
import (
"bytes"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"net/http"
"github.com/markbates/goth"
"golang.org/x/oauth2"
)
const (
authURL string = "https://discord.com/api/oauth2/authorize"
tokenURL string = "https://discord.com/api/oauth2/token"
userEndpoint string = "https://discord.com/api/users/@me"
)
const (
// ScopeIdentify allows /users/@me without email
ScopeIdentify string = "identify"
// ScopeEmail enables /users/@me to return an email
ScopeEmail string = "email"
// ScopeConnections allows /users/@me/connections to return linked Twitch and YouTube accounts
ScopeConnections string = "connections"
// ScopeGuilds allows /users/@me/guilds to return basic information about all of a user's guilds
ScopeGuilds string = "guilds"
// ScopeJoinGuild allows /invites/{invite.id} to be used for joining a user's guild
ScopeJoinGuild string = "guilds.join"
// ScopeGroupDMjoin allows your app to join users to a group dm
ScopeGroupDMjoin string = "gdm.join"
// ScopeBot is for oauth2 bots, this puts the bot in the user's selected guild by default
ScopeBot string = "bot"
// ScopeWebhook generates a webhook that is returned in the oauth token response for authorization code grants
ScopeWebhook string = "webhook.incoming"
// ScopeReadGuilds allows /users/@me/guilds/{guild.id}/member to return a user's member information in a guild
ScopeReadGuilds string = "guilds.members.read"
)
// New creates a new Discord provider, and sets up important connection details.
// You should always call `discord.New` to get a new Provider. Never try to create
// one manually.
func New(clientKey string, secret string, callbackURL string, scopes ...string) *Provider {
p := &Provider{
ClientKey: clientKey,
Secret: secret,
CallbackURL: callbackURL,
providerName: "discord",
}
p.config = newConfig(p, scopes)
return p
}
// Provider is the implementation of `goth.Provider` for accessing Discord
type Provider struct {
ClientKey string
Secret string
CallbackURL string
HTTPClient *http.Client
config *oauth2.Config
providerName string
permissions string
}
// Name gets the name used to retrieve this provider.
func (p *Provider) Name() string {
return p.providerName
}
// SetName is to update the name of the provider (needed in case of multiple providers of 1 type)
func (p *Provider) SetName(name string) {
p.providerName = name
}
// SetPermissions is to update the bot permissions (used for when ScopeBot is set)
func (p *Provider) SetPermissions(permissions string) {
p.permissions = permissions
}
func (p *Provider) Client() *http.Client {
return goth.HTTPClientWithFallBack(p.HTTPClient)
}
// Debug is no-op for the Discord package.
func (p *Provider) Debug(debug bool) {}
// BeginAuth asks Discord for an authentication end-point.
func (p *Provider) BeginAuth(state string) (goth.Session, error) {
opts := []oauth2.AuthCodeOption{
oauth2.AccessTypeOnline,
oauth2.SetAuthURLParam("prompt", "none"),
}
if p.permissions != "" {
opts = append(opts, oauth2.SetAuthURLParam("permissions", p.permissions))
}
url := p.config.AuthCodeURL(state, opts...)
s := &Session{
AuthURL: url,
}
return s, nil
}
// FetchUser will go to Discord and access basic info about the user.
func (p *Provider) FetchUser(session goth.Session) (goth.User, error) {
s := session.(*Session)
user := goth.User{
AccessToken: s.AccessToken,
Provider: p.Name(),
RefreshToken: s.RefreshToken,
ExpiresAt: s.ExpiresAt,
}
if user.AccessToken == "" {
// data is not yet retrieved since accessToken is still empty
return user, fmt.Errorf("%s cannot get user information without accessToken", p.providerName)
}
req, err := http.NewRequest("GET", userEndpoint, nil)
if err != nil {
return user, err
}
req.Header.Set("Accept", "application/json")
req.Header.Set("Authorization", "Bearer "+s.AccessToken)
resp, err := p.Client().Do(req)
if err != nil {
if resp != nil {
resp.Body.Close()
}
return user, err
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return user, fmt.Errorf("%s responded with a %d trying to fetch user information", p.providerName, resp.StatusCode)
}
bits, err := ioutil.ReadAll(resp.Body)
if err != nil {
return user, err
}
err = json.NewDecoder(bytes.NewReader(bits)).Decode(&user.RawData)
if err != nil {
return user, err
}
err = userFromReader(bytes.NewReader(bits), &user)
if err != nil {
return user, err
}
return user, err
}
func userFromReader(r io.Reader, user *goth.User) error {
u := struct {
Name string `json:"username"`
Email string `json:"email"`
AvatarID string `json:"avatar"`
MFAEnabled bool `json:"mfa_enabled"`
Discriminator string `json:"discriminator"`
Verified bool `json:"verified"`
ID string `json:"id"`
}{}
err := json.NewDecoder(r).Decode(&u)
if err != nil {
return err
}
// If this prefix is present, the image should be available as a gif,
// See : https://discord.com/developers/docs/reference#image-formatting
// Introduced by : Yyewolf
if u.AvatarID != "" {
avatarExtension := ".jpg"
prefix := "a_"
if len(u.AvatarID) >= len(prefix) && u.AvatarID[0:len(prefix)] == prefix {
avatarExtension = ".gif"
}
user.AvatarURL = "https://media.discordapp.net/avatars/" + u.ID + "/" + u.AvatarID + avatarExtension
}
user.Name = u.Name
user.Email = u.Email
user.UserID = u.ID
return nil
}
func newConfig(p *Provider, scopes []string) *oauth2.Config {
c := &oauth2.Config{
ClientID: p.ClientKey,
ClientSecret: p.Secret,
RedirectURL: p.CallbackURL,
Endpoint: oauth2.Endpoint{
AuthURL: authURL,
TokenURL: tokenURL,
},
Scopes: []string{},
}
if len(scopes) > 0 {
for _, scope := range scopes {
c.Scopes = append(c.Scopes, scope)
}
} else {
c.Scopes = []string{ScopeIdentify}
}
return c
}
// RefreshTokenAvailable refresh token is provided by auth provider or not
func (p *Provider) RefreshTokenAvailable() bool {
return true
}
// RefreshToken get new access token based on the refresh token
func (p *Provider) RefreshToken(refreshToken string) (*oauth2.Token, error) {
token := &oauth2.Token{RefreshToken: refreshToken}
ts := p.config.TokenSource(oauth2.NoContext, token)
newToken, err := ts.Token()
if err != nil {
return nil, err
}
return newToken, err
}