tools/module/discord/main.go

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package discord
import (
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"code.mrmelon54.com/melon/tools/utils"
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"context"
"embed"
_ "embed"
"fmt"
"github.com/bwmarrin/discordgo"
"github.com/google/uuid"
"github.com/gorilla/mux"
"golang.org/x/oauth2"
"html/template"
"net/http"
"os"
)
var (
//go:embed pages/index.go.html
indexTemplate string
//go:embed pages/assets/icon
iconFiles embed.FS
)
type Module struct {
sessionWrapper func(cb func(http.ResponseWriter, *http.Request, *utils.State)) func(rw http.ResponseWriter, req *http.Request)
oauthClient *oauth2.Config
}
type discordKeyType int
const (
KeyOauthClient = discordKeyType(iota)
KeyUser
KeyState
KeyAccessToken
KeyRefreshToken
)
func New() *Module {
return &Module{}
}
func (m *Module) GetName() string { return "Discord" }
func (m *Module) GetEndpoint() string { return "/discord" }
func (m *Module) SetupModule(router *mux.Router, f func(cb func(http.ResponseWriter, *http.Request, *utils.State)) func(rw http.ResponseWriter, req *http.Request)) {
m.sessionWrapper = f
m.oauthClient = &oauth2.Config{
ClientID: os.Getenv("DISCORD_CLIENT_ID"),
ClientSecret: os.Getenv("DISCORD_CLIENT_SECRET"),
Scopes: []string{"identify", "guilds", "connections", "email"},
Endpoint: oauth2.Endpoint{
AuthURL: "https://discord.com/oauth2/authorize",
TokenURL: "https://discord.com/api/oauth2/token",
},
RedirectURL: os.Getenv("DISCORD_REDIRECT_URL"),
}
router.HandleFunc("/", m.getClient(m.homepage))
router.HandleFunc("/login", m.sessionWrapper(m.loginPage))
router.PathPrefix("/assets/icon/{name}.svg").HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
vars := mux.Vars(req)
b, err := iconFiles.ReadFile("pages/assets/icon/" + vars["name"] + ".svg")
if err != nil {
rw.WriteHeader(http.StatusNotFound)
} else {
rw.Header().Set("Content-Type", "image/svg+xml")
rw.WriteHeader(http.StatusOK)
_, _ = rw.Write(b)
}
})
}
func (m *Module) getClient(cb func(http.ResponseWriter, *http.Request, *utils.State, *discordgo.Session)) func(rw http.ResponseWriter, req *http.Request) {
return m.sessionWrapper(func(rw http.ResponseWriter, req *http.Request, state *utils.State) {
if v, ok := utils.GetStateValue[*discordgo.Session](state, KeyOauthClient); ok {
cb(rw, req, state, v)
return
}
http.Redirect(rw, req, "/discord/login", http.StatusTemporaryRedirect)
})
}
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func (m *Module) homepage(rw http.ResponseWriter, _ *http.Request, state *utils.State, discordClient *discordgo.Session) {
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myUser, err := discordClient.User("@me")
if err != nil {
state.Del(KeyOauthClient)
http.Error(rw, err.Error(), http.StatusInternalServerError)
return
}
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myGuilds, err := discordClient.UserGuilds(200, "", "")
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if err != nil {
http.Error(rw, err.Error(), http.StatusInternalServerError)
return
}
myConns, err := discordClient.UserConnections()
if err != nil {
http.Error(rw, err.Error(), http.StatusInternalServerError)
return
}
tmp, err := template.New("homepage").Funcs(template.FuncMap{
"checkFlag": func(a discordgo.UserFlags, b int) bool { return (int(a) & b) != 0 },
"connectedLink": connectedLinkFunc,
}).Parse(indexTemplate)
if err != nil {
fmt.Println("Template parse error:", err)
return
}
guildIcons := make([]string, len(myGuilds))
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for i, j := range myGuilds {
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var a discordgo.Guild
a.ID = j.ID
a.Icon = j.Icon
guildIcons[i] = a.IconURL()
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}
err = tmp.Execute(rw, struct {
User *discordgo.User
UserAccent string
Avatar string
Banner string
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Guilds []*discordgo.UserGuild
GuildIcons []string
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Connections []*discordgo.UserConnection
}{
User: myUser,
UserAccent: fmt.Sprintf("#%06x", myUser.AccentColor),
Avatar: myUser.AvatarURL("256"),
Banner: myUser.BannerURL("256"),
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Guilds: myGuilds,
GuildIcons: guildIcons,
Connections: myConns,
})
if err != nil {
fmt.Println("Template execute error:", err)
return
}
}
func (m *Module) loginPage(rw http.ResponseWriter, req *http.Request, state *utils.State) {
if myUser, ok := utils.GetStateValue[*string](state, KeyUser); ok {
if myUser != nil {
http.Redirect(rw, req, "/discord", http.StatusTemporaryRedirect)
return
}
}
if flowState, ok := utils.GetStateValue[uuid.UUID](state, KeyState); ok {
q := req.URL.Query()
if q.Has("code") && q.Has("state") {
if q.Get("state") == flowState.String() {
exchange, err := m.oauthClient.Exchange(context.Background(), q.Get("code"))
if err != nil {
fmt.Println("Exchange token error:", err)
return
}
c, err := discordgo.New("Bearer " + exchange.AccessToken)
if err != nil {
fmt.Println("Create client error:", err)
return
}
state.Put(KeyOauthClient, c)
state.Put(KeyAccessToken, exchange.AccessToken)
state.Put(KeyRefreshToken, exchange.RefreshToken)
http.Redirect(rw, req, "/discord", http.StatusTemporaryRedirect)
return
}
http.Error(rw, "OAuth flow state doesn't match\n", http.StatusBadRequest)
return
}
}
flowState := uuid.New()
state.Put(KeyState, flowState)
http.Redirect(rw, req, m.oauthClient.AuthCodeURL(flowState.String(), oauth2.AccessTypeOffline), http.StatusTemporaryRedirect)
}
func connectedLinkFunc(a *discordgo.UserConnection) string {
switch a.Type {
case "domain":
return "https://" + a.Name
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case "github":
return "https://github.com/" + a.Name
case "reddit":
return "https://www.reddit.com/u/" + a.Name
case "spotify":
return "https://open.spotify.com/user/" + a.ID
case "steam":
return "https://steamcommunity.com/profiles/" + a.ID
case "twitch":
return "https://www.twitch.tv/" + a.Name
case "twitter":
return "https://twitter.com/" + a.Name
case "youtube":
return "https://www.youtube.com/channel/" + a.ID
}
return ""
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}