auth: decouple types and functions from db (#6320)

internal/auth/github/config.go

@@ -0,0 +1,58 @@
+// Copyright 2020 The Gogs Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package github
+
+import (
+	"context"
+	"crypto/tls"
+	"net/http"
+	"strings"
+
+	"github.com/google/go-github/github"
+	"github.com/pkg/errors"
+)
+
+// Config contains configuration for GitHub authentication.
+//
+// ⚠️ WARNING: Change to the field name must preserve the INI key name for backward compatibility.
+type Config struct {
+	// the GitHub service endpoint, e.g. https://api.github.com/.
+	APIEndpoint string
+	SkipVerify  bool
+}
+
+func (c *Config) doAuth(login, password string) (fullname, email, location, website string, err error) {
+	tp := github.BasicAuthTransport{
+		Username: strings.TrimSpace(login),
+		Password: strings.TrimSpace(password),
+		Transport: &http.Transport{
+			TLSClientConfig: &tls.Config{InsecureSkipVerify: c.SkipVerify},
+		},
+	}
+	client, err := github.NewEnterpriseClient(c.APIEndpoint, c.APIEndpoint, tp.Client())
+	if err != nil {
+		return "", "", "", "", errors.Wrap(err, "create new client")
+	}
+	user, _, err := client.Users.Get(context.Background(), "")
+	if err != nil {
+		return "", "", "", "", errors.Wrap(err, "get user info")
+	}
+
+	if user.Name != nil {
+		fullname = *user.Name
+	}
+	if user.Email != nil {
+		email = *user.Email
+	} else {
+		email = login + "+github@local"
+	}
+	if user.Location != nil {
+		location = strings.ToUpper(*user.Location)
+	}
+	if user.HTMLURL != nil {
+		website = strings.ToLower(*user.HTMLURL)
+	}
+	return fullname, email, location, website, nil
+}