Initial QSfera import

Server/vendor/github.com/libregraph/lico/utils/http.go

@@ -0,0 +1,96 @@
+/*
+ * Copyright 2017-2019 Kopano and its licensors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package utils
+
+import (
+	"crypto/tls"
+	"net"
+	"net/http"
+	"time"
+
+	"golang.org/x/net/http2"
+
+	"github.com/libregraph/lico/version"
+)
+
+const (
+	defaultHTTPTimeout               = 30 * time.Second
+	defaultHTTPKeepAlive             = 30 * time.Second
+	defaultHTTPMaxIdleConns          = 100
+	defaultHTTPIdleConnTimeout       = 90 * time.Second
+	defaultHTTPTLSHandshakeTimeout   = 10 * time.Second
+	defaultHTTPExpectContinueTimeout = 1 * time.Second
+)
+
+// DefaultHTTPUserAgent is the User-Agent Header which should be used when
+// making HTTP requests.
+var DefaultHTTPUserAgent = "LibreGraph-Connect/" + version.Version
+
+// HTTPTransportWithTLSClientConfig creates a new http.Transport with sane
+// default settings using the provided tls.Config.
+func HTTPTransportWithTLSClientConfig(tlsClientConfig *tls.Config) *http.Transport {
+	transport := &http.Transport{
+		Proxy: http.ProxyFromEnvironment,
+		DialContext: (&net.Dialer{
+			Timeout:   defaultHTTPTimeout,
+			KeepAlive: defaultHTTPKeepAlive,
+			DualStack: true,
+		}).DialContext,
+		MaxIdleConns:          defaultHTTPMaxIdleConns,
+		IdleConnTimeout:       defaultHTTPIdleConnTimeout,
+		TLSHandshakeTimeout:   defaultHTTPTLSHandshakeTimeout,
+		ExpectContinueTimeout: defaultHTTPExpectContinueTimeout,
+	}
+	if tlsClientConfig != nil {
+		transport.TLSClientConfig = tlsClientConfig
+		err := http2.ConfigureTransport(transport)
+		if err != nil {
+			panic(err)
+		}
+	}
+
+	return transport
+}
+
+// DefaultTLSConfig returns a new tls.Config.
+func DefaultTLSConfig() *tls.Config {
+	return &tls.Config{
+		ClientSessionCache: tls.NewLRUClientSessionCache(0),
+	}
+}
+
+// InsecureSkipVerifyTLSConfig returns a new tls.Config which does skip TLS verification.
+func InsecureSkipVerifyTLSConfig() *tls.Config {
+	config := DefaultTLSConfig()
+	config.InsecureSkipVerify = true
+
+	return config
+}
+
+// DefaultHTTPClient is a http.Client with a timeout set.
+var DefaultHTTPClient = &http.Client{
+	Timeout:   defaultHTTPTimeout,
+	Transport: HTTPTransportWithTLSClientConfig(DefaultTLSConfig()),
+}
+
+// InsecureHTTPClient is a http.Client with a timeout set and with TLS
+// verification disabled.
+var InsecureHTTPClient = &http.Client{
+	Timeout:   defaultHTTPTimeout,
+	Transport: HTTPTransportWithTLSClientConfig(InsecureSkipVerifyTLSConfig()),
+}