add license banner for GNU AGPLv3 (#15178)

Bonus: rewrite subnet re-use of Transport

internal/config/subnet/config.go

@@ -18,6 +18,10 @@
 package subnet
 
 import (
+	"net/http"
+	"net/url"
+	"strings"
+
 	"github.com/minio/minio/internal/config"
 	"github.com/minio/pkg/env"
 	xnet "github.com/minio/pkg/net"
@@ -49,10 +53,13 @@ type Config struct {
 
 	// The HTTP(S) proxy URL to use for connecting to SUBNET
 	ProxyURL *xnet.URL `json:"proxy_url"`
+
+	// Transport configured with proxy_url if set optionally.
+	transport *http.Transport
 }
 
 // LookupConfig - lookup config and override with valid environment settings if any.
-func LookupConfig(kvs config.KVS) (cfg Config, err error) {
+func LookupConfig(kvs config.KVS, transport http.RoundTripper) (cfg Config, err error) {
 	if err = config.CheckValidKeys(config.SubnetSubSys, kvs, DefaultKVS); err != nil {
 		return cfg, err
 	}
@@ -63,10 +70,24 @@ func LookupConfig(kvs config.KVS) (cfg Config, err error) {
 		if err != nil {
 			return cfg, err
 		}
+
 	}
 
-	cfg.License = env.Get(config.EnvMinIOSubnetLicense, kvs.Get(config.License))
-	cfg.APIKey = env.Get(config.EnvMinIOSubnetAPIKey, kvs.Get(config.APIKey))
+	cfg.License = strings.TrimSpace(env.Get(config.EnvMinIOSubnetLicense, kvs.Get(config.License)))
+	cfg.APIKey = strings.TrimSpace(env.Get(config.EnvMinIOSubnetAPIKey, kvs.Get(config.APIKey)))
+
+	if transport == nil {
+		// when transport is nil, it means we are just validating the
+		// inputs not performing any network calls.
+		return cfg, nil
+	}
+
+	// Make sure to clone the transport before editing the ProxyURL
+	ctransport := transport.(*http.Transport).Clone()
+	if cfg.ProxyURL != nil {
+		ctransport.Proxy = http.ProxyURL((*url.URL)(cfg.ProxyURL))
+	}
+	cfg.transport = ctransport
 
 	return cfg, nil
 }

internal/config/subnet/subnet.go

@@ -0,0 +1,76 @@
+// Copyright (c) 2015-2022 MinIO, Inc.
+//
+// This file is part of MinIO Object Storage stack
+//
+// 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 subnet
+
+import (
+	"bytes"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"net/http"
+	"time"
+
+	xhttp "github.com/minio/minio/internal/http"
+)
+
+const (
+	respBodyLimit = 1 << 20 // 1 MiB
+)
+
+// Post submit 'payload' to specified URL
+func (c Config) Post(reqURL string, payload interface{}) (string, error) {
+	if len(c.APIKey) == 0 {
+		return "", errors.New("Deployment is not registered with SUBNET. Please register the deployment via 'mc support register ALIAS'")
+	}
+	body, err := json.Marshal(payload)
+	if err != nil {
+		return "", err
+	}
+	r, err := http.NewRequest(http.MethodPost, reqURL, bytes.NewReader(body))
+	if err != nil {
+		return "", err
+	}
+
+	r.Header.Set("Authorization", c.APIKey)
+	r.Header.Set("Content-Type", "application/json")
+
+	client := &http.Client{
+		Timeout:   10 * time.Second,
+		Transport: c.transport,
+	}
+
+	resp, err := client.Do(r)
+	if err != nil {
+		return "", err
+	}
+	defer xhttp.DrainBody(resp.Body)
+
+	respBytes, err := ioutil.ReadAll(io.LimitReader(resp.Body, respBodyLimit))
+	if err != nil {
+		return "", err
+	}
+	respStr := string(respBytes)
+
+	if resp.StatusCode == http.StatusOK {
+		return respStr, nil
+	}
+
+	return respStr, fmt.Errorf("SUBNET request failed with code %d and error: %s", resp.StatusCode, respStr)
+}