feat: add basic SDK

main.go

@@ -0,0 +1,47 @@
+package oidclogin
+
+import (
+	"context"
+	"crypto/rand"
+	"encoding/base64"
+	"log"
+	"os"
+
+	"github.com/coreos/go-oidc/v3/oidc"
+	"github.com/gin-gonic/gin"
+	"golang.org/x/oauth2"
+)
+
+func createRandomString(n int) (string, error) {
+	s := make([]byte, n)
+	if _, err := rand.Read(s); err != nil {
+		return "", err
+	}
+	return base64.URLEncoding.EncodeToString(s), nil
+}
+
+var (
+	config   oauth2.Config
+	userFunc func(userid string, name string, email string)
+	verifier oidc.IDTokenVerifier
+)
+
+func Configure(r *gin.Engine, app_url string, scopes []string) {
+	r.GET("/auth/v2/login", LoginHandler)
+	r.GET("/auth/v2/verify", CallbackHandler)
+
+	provider, err := oidc.NewProvider(context.Background(), os.Getenv("OIDC_ISSUER"))
+	clientID := os.Getenv("OIDC_CLIENT_ID")
+	verifier = *provider.Verifier(&oidc.Config{ClientID: clientID})
+	if err != nil {
+		log.Fatal("Provider resolution failed with error", err)
+	}
+
+	config = oauth2.Config{
+		ClientID:     clientID,
+		ClientSecret: os.Getenv("OIDC_CLIENT_SECRET"),
+		Endpoint:     provider.Endpoint(),
+		RedirectURL:  app_url + "/auth/v2/verify",
+		Scopes:       []string{oidc.ScopeOpenID, "email", "profile"},
+	}
+}