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confirmPermission.go
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/
confirmPermission.go
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package remconfirmpermission
import (
"context"
"encoding/json"
"errors"
"fmt"
"net/http"
"os"
"strconv"
"strings"
"cloud.google.com/go/datastore"
"github.com/GoogleCloudPlatform/functions-framework-go/functions"
)
func init() {
functions.HTTP("confirm-permission", confirmPermission)
}
func contains(s []string, e string) bool {
for _, a := range s {
if a == e {
return true
}
}
return false
}
func corsHandler(writer http.ResponseWriter, request *http.Request) {
allowed := strings.Split(os.Getenv("ALLOWED_ORIGINS"), "||")
origin := request.Header.Get("Origin")
if contains(allowed, origin) {
writer.Header().Set("Access-Control-Allow-Origin", origin)
}
}
func confirmPermission(writer http.ResponseWriter, request *http.Request) {
corsHandler(writer, request)
var params struct {
UserID string `json:"userID"`
Token int64 `json:"token"`
GuildID string `json:"guildID"`
}
if err := json.NewDecoder(request.Body).Decode(¶ms); err != nil {
writer.WriteHeader(http.StatusInternalServerError)
fmt.Fprint(writer, "Failed to decode request body: ", err)
return
}
if params.UserID == "" || params.GuildID == "" || params.Token == 0 {
writer.WriteHeader(http.StatusBadRequest)
fmt.Fprint(writer, "Missing parameters.")
return
}
if err := verifyUser(params.UserID, params.Token, params.GuildID); err != nil {
writer.WriteHeader(http.StatusUnauthorized)
fmt.Fprint(writer, "Invalid token or user, or insufficient guild permissions: ", err)
return
}
err := verifyGuild(params.GuildID, params.Token)
if err != nil {
writer.WriteHeader(http.StatusUnauthorized)
fmt.Fprint(writer, "Failed to verify guild: ", err)
return
}
}
type TokenResponse struct {
UserID string `json:"userID"`
Username string `json:"username"`
Discriminator string `json:"discriminator"`
Avatar string `json:"avatar"`
Token int64 `json:"token"`
AccessToken string `json:"accessToken"`
}
type User struct {
Token int64 `json:"token"`
UserID string `json:"userID"`
}
type UserPerms []struct {
Permissions string `json:"permissions"`
}
func verifyUser(userID string, Token int64, guildID string) (err error) {
resp, err := http.Post(os.Getenv("GCP_BASE_URI")+"verify-user", "application/json", strings.NewReader(fmt.Sprintf(`{"userID":"%s","token":%d}`, userID, Token)))
if err != nil {
err = errors.New("Failed to verify user: " + err.Error())
return
}
if resp.StatusCode != http.StatusOK {
err = fmt.Errorf("verify-user returned status code %d", resp.StatusCode)
return
}
var user TokenResponse
err = json.NewDecoder(resp.Body).Decode(&user)
if err != nil {
return
}
resp.Body.Close()
guildIDInt, err := strconv.ParseInt(guildID, 10, 64)
if err != nil {
return
}
req, err := http.NewRequest("GET", fmt.Sprintf("%s/users/@me/guilds?&after=%d&limit=1", os.Getenv("DISCORD_BASE_URI"), guildIDInt-1), nil)
if err != nil {
return
}
req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", user.AccessToken))
client := &http.Client{}
resp, err = client.Do(req)
if err != nil {
return
}
if resp.StatusCode != http.StatusOK {
err = fmt.Errorf("guild member returned status code %d", resp.StatusCode)
return
}
var userPerms UserPerms
err = json.NewDecoder(resp.Body).Decode(&userPerms)
if err != nil {
return
}
resp.Body.Close()
Administrator := int64(8)
perms, err := strconv.ParseInt(userPerms[0].Permissions, 10, 64)
if err != nil {
return
}
if perms&Administrator == 0 {
err = fmt.Errorf("User does not have administrator permissions")
return
}
return
}
type discordError struct {
Code int `json:"code"`
Message string `json:"message"`
Error string `json:"error"`
ErrorDescription string `json:"error_description"`
}
type Auth struct {
AccessToken string `json:"access_token"`
ExpiresIn int `json:"expires_in"`
RefreshToken string `json:"refresh_token"`
discordError
}
type GuildID struct {
ID string `json:"id"`
}
type Guild struct {
discordError
AccessToken string `json:"access_token"`
RefreshToken string `json:"refresh_token"`
ExpiresIn int `json:"expires_in"`
GuildID GuildID `json:"guild"`
}
type Token struct {
ExpiresAt int64 `datastore:"expiresAt"`
AccessToken string `datastore:"accessToken"`
RefreshToken string `datastore:"refreshToken"`
}
func verifyGuild(guildID string, token int64) (err error) {
ctx := context.Background()
projectID := os.Getenv("GCP_PROJECT_ID")
client, err := datastore.NewClient(ctx, projectID)
if err != nil {
return
}
defer client.Close()
var tokenData Token
err = client.Get(ctx, datastore.NameKey("Guild", guildID, nil), &tokenData)
if err != nil {
return
}
if tokenData.AccessToken == "" {
err = errors.New("No token found")
}
return
}
func updateToken(tokenData Token, guildID string) (err error) {
ctx := context.Background()
projectID := os.Getenv("GCP_PROJECT_ID")
client, err := datastore.NewClient(ctx, projectID)
if err != nil {
return
}
defer client.Close()
_, err = client.Put(ctx, datastore.NameKey("Guild", guildID, nil), &Token{
ExpiresAt: tokenData.ExpiresAt,
AccessToken: tokenData.AccessToken,
RefreshToken: tokenData.RefreshToken,
})
return
}