Rename restapi to api (#3176)

Signed-off-by: Daniel Valdivia <18384552+dvaldivia@users.noreply.github.com>

api/tls.go

@@ -0,0 +1,81 @@
+// This file is part of MinIO Console Server
+// Copyright (c) 2021 MinIO, Inc.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package api
+
+import (
+	"crypto/tls"
+	"net"
+	"net/http"
+	"time"
+)
+
+type ConsoleTransport struct {
+	Transport *http.Transport
+	ClientIP  string
+}
+
+func (t *ConsoleTransport) RoundTrip(req *http.Request) (*http.Response, error) {
+	req.Header.Add("X-Forwarded-For", t.ClientIP)
+	resp, err := t.Transport.RoundTrip(req)
+	return resp, err
+}
+
+// PrepareSTSClientTransport :
+func PrepareSTSClientTransport(insecure bool, remoteAddress string) *ConsoleTransport {
+	// This takes github.com/minio/madmin-go/v3/transport.go as an example
+	//
+	// DefaultTransport - this default transport is similar to
+	// http.DefaultTransport but with additional param  DisableCompression
+	// is set to true to avoid decompressing content with 'gzip' encoding.
+	DefaultTransport := &http.Transport{
+		Proxy: http.ProxyFromEnvironment,
+		DialContext: (&net.Dialer{
+			Timeout:   10 * time.Second,
+			KeepAlive: 15 * time.Second,
+		}).DialContext,
+		MaxIdleConns:          1024,
+		MaxIdleConnsPerHost:   1024,
+		IdleConnTimeout:       90 * time.Second,
+		TLSHandshakeTimeout:   10 * time.Second,
+		ExpectContinueTimeout: 10 * time.Second,
+		DisableCompression:    true,
+		TLSClientConfig: &tls.Config{
+			// Can't use SSLv3 because of POODLE and BEAST
+			// Can't use TLSv1.0 because of POODLE and BEAST using CBC cipher
+			// Can't use TLSv1.1 because of RC4 cipher usage
+			MinVersion:         tls.VersionTLS12,
+			InsecureSkipVerify: insecure,
+			RootCAs:            GlobalRootCAs,
+		},
+	}
+	t := &ConsoleTransport{
+		Transport: DefaultTransport,
+		ClientIP:  remoteAddress,
+	}
+	return t
+}
+
+// PrepareConsoleHTTPClient returns an http.Client with custom configurations need it by *credentials.STSAssumeRole
+// custom configurations include the use of CA certificates
+func PrepareConsoleHTTPClient(insecure bool, clientIP string) *http.Client {
+	transport := PrepareSTSClientTransport(insecure, clientIP)
+	// Return http client with default configuration
+	c := &http.Client{
+		Transport: transport,
+	}
+	return c
+}