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main.go
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main.go
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// Copyright 2023 Jigsaw Operations LLC
//
// 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
//
// https://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 main
import (
"bufio"
"context"
"flag"
"fmt"
"io"
"log"
"net"
"net/http"
"net/textproto"
"os"
"path"
"strings"
"time"
"github.com/Jigsaw-Code/outline-sdk/x/config"
)
var debugLog log.Logger = *log.New(io.Discard, "", 0)
type stringArrayFlagValue []string
func (v *stringArrayFlagValue) String() string {
return fmt.Sprint(*v)
}
func (v *stringArrayFlagValue) Set(value string) error {
*v = append(*v, value)
return nil
}
func init() {
flag.Usage = func() {
fmt.Fprintf(flag.CommandLine.Output(), "Usage: %s [flags...] <url>\n", path.Base(os.Args[0]))
flag.PrintDefaults()
}
}
func main() {
verboseFlag := flag.Bool("v", false, "Enable debug output")
transportFlag := flag.String("transport", "", "Transport config")
addressFlag := flag.String("address", "", "Address to connect to. If empty, use the URL authority")
methodFlag := flag.String("method", "GET", "The HTTP method to use")
var headersFlag stringArrayFlagValue
flag.Var(&headersFlag, "H", "Raw HTTP Header line to add. It must not end in \\r\\n")
timeoutSecFlag := flag.Int("timeout", 5, "Timeout in seconds")
flag.Parse()
if *verboseFlag {
debugLog = *log.New(os.Stderr, "[DEBUG] ", log.LstdFlags|log.Lmicroseconds|log.Lshortfile)
}
var overrideHost, overridePort string
if *addressFlag != "" {
var err error
overrideHost, overridePort, err = net.SplitHostPort(*addressFlag)
if err != nil {
// Fail to parse. Assume the flag is host only.
overrideHost = *addressFlag
overridePort = ""
}
}
url := flag.Arg(0)
if url == "" {
log.Println("Need to pass the URL to fetch in the command-line")
flag.Usage()
os.Exit(1)
}
dialer, err := config.NewDefaultConfigToDialer().NewStreamDialer(*transportFlag)
if err != nil {
log.Fatalf("Could not create dialer: %v\n", err)
}
dialContext := func(ctx context.Context, network, addr string) (net.Conn, error) {
host, port, err := net.SplitHostPort(addr)
if err != nil {
return nil, fmt.Errorf("invalid address: %w", err)
}
if overrideHost != "" {
host = overrideHost
}
if overridePort != "" {
port = overridePort
}
if !strings.HasPrefix(network, "tcp") {
return nil, fmt.Errorf("protocol not supported: %v", network)
}
return dialer.DialStream(ctx, net.JoinHostPort(host, port))
}
httpClient := &http.Client{
Transport: &http.Transport{DialContext: dialContext},
Timeout: time.Duration(*timeoutSecFlag) * time.Second,
CheckRedirect: func(req *http.Request, via []*http.Request) error {
return http.ErrUseLastResponse
},
}
req, err := http.NewRequest(*methodFlag, url, nil)
if err != nil {
log.Fatalln("Failed to create request:", err)
}
headerText := strings.Join(headersFlag, "\r\n") + "\r\n\r\n"
h, err := textproto.NewReader(bufio.NewReader(strings.NewReader(headerText))).ReadMIMEHeader()
if err != nil {
log.Fatalf("invalid header line: %v", err)
}
for name, values := range h {
for _, value := range values {
req.Header.Add(name, value)
}
}
resp, err := httpClient.Do(req)
if err != nil {
log.Fatalf("HTTP request failed: %v\n", err)
}
defer resp.Body.Close()
if *verboseFlag {
for k, v := range resp.Header {
debugLog.Printf("%v: %v", k, v)
}
}
_, err = io.Copy(os.Stdout, resp.Body)
fmt.Println()
if err != nil {
log.Fatalf("Read of page body failed: %v\n", err)
}
}