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github.go
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github.go
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package github
import (
"encoding/json"
"fmt"
"net/http"
"github.com/danilopolani/gocialite"
"github.com/diamondburned/facechat/backend/db"
"github.com/diamondburned/facechat/backend/dotenv"
"github.com/diamondburned/facechat/backend/facechat"
"github.com/diamondburned/facechat/backend/http/addr"
"github.com/diamondburned/facechat/backend/http/auth"
"github.com/diamondburned/facechat/backend/http/tx"
"github.com/diamondburned/facechat/backend/internal/httperr"
"github.com/go-chi/chi"
"github.com/pkg/errors"
)
var (
clientID string
clientSecret string
redirectURL string
gocial = gocialite.NewDispatcher()
)
func init() {
clientID = dotenv.Getenv("GITHUB_CLIENT_ID")
clientSecret = dotenv.Getenv("GITHUB_CLIENT_SECRET")
// TODO: improve
url := addr.HTTP()
url.Path += "/oauth/github/callback"
redirectURL = url.String()
}
func Mount() http.Handler {
r := chi.NewMux()
r.HandleFunc("/login", loginHandler)
r.HandleFunc("/callback", callbackHandler)
return r
}
func loginHandler(w http.ResponseWriter, r *http.Request) {
gocialnew := gocial.New()
// spew.Dump(gocialnew)
a, err := gocialnew.Driver("github").Redirect(
clientID, clientSecret, redirectURL,
)
if err != nil {
httperr.WriteErr(w, errors.Wrap(err, "failed to create new oauth session"))
return
}
http.Redirect(w, r, a, http.StatusFound)
}
type Data struct {
Username string `json:"username"` // .Login
AvatarURL string `json:"avatar_url"` // .AvatarURL
}
var (
ErrUnknown = httperr.New(500, "unknown error")
ErrMissingID = httperr.New(500, "missing ID")
ErrMissingUsername = httperr.New(500, "missing username")
)
func callbackHandler(w http.ResponseWriter, r *http.Request) {
s := auth.Session(r)
u, _, err := gocial.Handle(r.FormValue("state"), r.FormValue("code"))
if err != nil {
httperr.WriteErr(w, httperr.Wrap(err, 400, "failed to handle callback"))
return
}
var data = Data{
Username: u.Username,
AvatarURL: u.Avatar,
}
dataJSON, err := json.Marshal(data)
if err != nil {
httperr.WriteErr(w, errors.Wrap(err, "Failed to marshal github data"))
return
}
var name = u.Username
if u.FullName != "<nil>" { // gocial is a trash library
name = u.FullName
}
var account = facechat.Account{
Service: "GitHub",
Name: name,
URL: fmt.Sprintf("https://github.com/%s", data.Username),
Data: dataJSON,
UserID: s.UserID,
}
err = tx.Acquire(r, func(tx *db.Tx) error {
return errors.Wrap(tx.AddAccount(account), "failed to save")
})
if err != nil {
httperr.WriteErr(w, err)
return
}
// TODO: redirect back to profile?
http.Redirect(w, r, "/user", http.StatusFound)
}