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

internal/auth/github/provider.go

@@ -0,0 +1,57 @@
+// 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 (
+	"strings"
+
+	"gogs.io/gogs/internal/auth"
+)
+
+// Provider contains configuration of a PAM authentication provider.
+type Provider struct {
+	config *Config
+}
+
+// NewProvider creates a new PAM authentication provider.
+func NewProvider(cfg *Config) auth.Provider {
+	return &Provider{
+		config: cfg,
+	}
+}
+
+func (p *Provider) Authenticate(login, password string) (*auth.ExternalAccount, error) {
+	fullname, email, website, location, err := p.config.doAuth(login, password)
+	if err != nil {
+		if strings.Contains(err.Error(), "401") {
+			return nil, auth.ErrBadCredentials{Args: map[string]interface{}{"login": login}}
+		}
+		return nil, err
+	}
+	return &auth.ExternalAccount{
+		Login:    login,
+		Name:     login,
+		FullName: fullname,
+		Email:    email,
+		Location: location,
+		Website:  website,
+	}, nil
+}
+
+func (p *Provider) Config() interface{} {
+	return p.config
+}
+
+func (p *Provider) HasTLS() bool {
+	return true
+}
+
+func (p *Provider) UseTLS() bool {
+	return true
+}
+
+func (p *Provider) SkipTLSVerify() bool {
+	return p.config.SkipVerify
+}