Discord Oauth2 support

[l0go]

Read the title!

[chaoticryptidz]

I want this so bad.

[sinni800]

Gotta upgrade goth first, then it seems easy to add. The current vendored goth is too old.

[sinni800]

diff --git a/modules/auth/oauth2/oauth2.go b/modules/auth/oauth2/oauth2.go
index de125c619..ca964b4e7 100644
--- a/modules/auth/oauth2/oauth2.go
+++ b/modules/auth/oauth2/oauth2.go
@@ -16,6 +16,7 @@ import (
        "github.com/markbates/goth"
        "github.com/markbates/goth/gothic"
        "github.com/markbates/goth/providers/bitbucket"
+       "github.com/markbates/goth/providers/discord"
        "github.com/markbates/goth/providers/dropbox"
        "github.com/markbates/goth/providers/facebook"
        "github.com/markbates/goth/providers/github"
@@ -23,7 +24,7 @@ import (
        "github.com/markbates/goth/providers/gplus"
        "github.com/markbates/goth/providers/openidConnect"
        "github.com/markbates/goth/providers/twitter"
-       "github.com/satori/go.uuid"
+       uuid "github.com/satori/go.uuid"
 )

 var (
@@ -124,6 +125,8 @@ func createProvider(providerName, providerType, clientID, clientSecret, openIDCo
        switch providerType {
        case "bitbucket":
                provider = bitbucket.New(clientID, clientSecret, callbackURL, "account")
+       case "discord":
+               provider = discord.New(clientID, clientSecret, callbackURL, "email", "identify")
        case "dropbox":
                provider = dropbox.New(clientID, clientSecret, callbackURL)
        case "facebook":

diff --git a/models/oauth2.go b/models/oauth2.go
index 0640471a4..be575d7c1 100644
--- a/models/oauth2.go
+++ b/models/oauth2.go
@@ -23,6 +23,7 @@ type OAuth2Provider struct {
 // value is used to store display data
 var OAuth2Providers = map[string]OAuth2Provider{
        "bitbucket": {Name: "bitbucket", DisplayName: "Bitbucket", Image: "/img/auth/bitbucket.png"},
+       "discord":   {Name: "discord", DisplayName: "Discord", Image: "/img/auth/discord.png"},
        "dropbox":   {Name: "dropbox", DisplayName: "Dropbox", Image: "/img/auth/dropbox.png"},
        "facebook":  {Name: "facebook", DisplayName: "Facebook", Image: "/img/auth/facebook.png"},
        "github": {Name: "github", DisplayName: "GitHub", Image: "/img/auth/github.png",

Here's a diff that made me able to use discord as the authentication provider.
Gotta add /img/auth/discord.png

@techknowlogick Should I add another issue to update goth?

[techknowlogick]

@sinni800 I've just updated Goth in my linked PR, can you try it out?

[sinni800]

Oh I completely oversaw the PR that you made. That changed pretty much the same things so it would work just fine.