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Initial version

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Signed-off-by: Knut Ahlers <knut@ahlers.me>
This commit is contained in:
Knut Ahlers 2017-04-14 02:45:38 +02:00
commit 1d35b0988e
Signed by: luzifer
GPG key ID: DC2729FDD34BE99E
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expose

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# Contributing to this project
Contributions are encouraged and welcome. Thank you very much for taking your time to contribute!
## Code of Conduct
This project adheres to the [Contributor Covenant code of conduct](http://contributor-covenant.org/version/1/4/). By participating, you are expected to uphold this code. Please report unacceptable behavior to the [project maintainer](mailto:help@luzifer.io).
## Developer Certificate of Origin
Please also review the [Developer Certificate of Origin](https://developercertificate.org/). All commits must be signed off using `git commit -s` to indicate you've read the document and your contribution meets the criteria defined in it.

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Copyright 2017 Knut Ahlers <knut@ahlers.me>
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
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See the License for the specific language governing permissions and
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# Luzifer / expose
`expose` is a small CLI utility to control a running [ngrok 2](https://ngrok.com/) daemon.
## Use cases
- Quickly open a local port to demonstrate something to someone
```bash
# expose create 4000
Created tunnel to address "localhost:4000" with URL https://8d35e4bf.eu.ngrok.io
```
- Close that port again
```bash
# go run *.go delete 4000
Successfully closed tunnel "expose_4000" to address "localhost:4000".
```
- Quickly share a folder with files through HTTP
```bash
# go run *.go serve
Created HTTP server for this directory with URL https://81e668af.eu.ngrok.io
Press Ctrl+C to stop server and tunnel
```
- List the active tunnels in a nice table
```bash
# go run *.go list
NAME | TYPE | ADDRESS | PUBLIC URL
+-------------+-------+----------------+------------------------------+
expose_3000 | https | localhost:3000 | https://9c8d36d6.eu.ngrok.io
```
## How to set up
- Download the latest release of [ngrok 2](https://ngrok.com/)
- Configure ngrok (see the official documentation for that!)
- For this to work you only need an `authtoken` set in `~/.ngrok2/ngrok.yml`
- Set it up to start automatically (see `docs/ngrok.service` for a systemd service file)
- Download the [latest release](https://github.com/Luzifer/expose/releases/latest) of this tool

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package cmd
import (
"fmt"
"github.com/spf13/cobra"
)
// clearCmd represents the clear command
var clearCmd = &cobra.Command{
Use: "clear",
Short: "Remove all active tunnels",
RunE: func(cmd *cobra.Command, args []string) error {
tunnels, err := client.ListTunnels()
if err != nil {
return err
}
if len(tunnels) == 0 {
fmt.Println("No tunnels active to be closed.")
return nil
}
for _, tun := range tunnels {
if err := client.StopTunnel(tun.Name); err != nil {
return fmt.Errorf("Unable to stop tunnel %q: %s", tun.Name, err)
}
fmt.Printf("Successfully closed tunnel %q to address %q.\n", tun.Name, tun.Config.Addr)
}
return nil
},
}
func init() {
RootCmd.AddCommand(clearCmd)
// Here you will define your flags and configuration settings.
// Cobra supports Persistent Flags which will work for this command
// and all subcommands, e.g.:
// clearCmd.PersistentFlags().String("foo", "", "A help for foo")
// Cobra supports local flags which will only run when this command
// is called directly, e.g.:
// clearCmd.Flags().BoolP("toggle", "t", false, "Help message for toggle")
}

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package cmd
import (
"errors"
"fmt"
"strconv"
"github.com/Luzifer/expose/ngrok2"
"github.com/spf13/cobra"
)
// createCmd represents the create command
var createCmd = &cobra.Command{
Use: "create <port>",
Short: "Create a new HTTPs tunnel to a local port",
RunE: func(cmd *cobra.Command, args []string) error {
if len(args) != 1 {
return errors.New("Port not specified")
}
port, err := strconv.Atoi(args[0])
if err != nil {
return fmt.Errorf("Port %q is not a valid integer: %s", args[0], err)
}
name := fmt.Sprintf("expose_%d", port)
if tun, err := client.GetTunnelByName(name); err == nil {
return fmt.Errorf("Address %q already has an active tunnel with URL %s", tun.Config.Addr, tun.PublicURL)
}
inspect, err := cmd.Flags().GetBool("inspect")
if err != nil {
return fmt.Errorf("Unable to read inspect flag: %s", err)
}
tun, err := client.CreateTunnel(ngrok2.CreateTunnelInput{
Name: name,
Addr: strconv.Itoa(port),
Proto: "http",
BindTLS: "true",
Inspect: inspect,
})
if err != nil {
return fmt.Errorf("Unable to create tunnel: %s", err)
}
fmt.Printf("Created tunnel to address %q with URL %s\n", tun.Config.Addr, tun.PublicURL)
return nil
},
}
func init() {
RootCmd.AddCommand(createCmd)
// Here you will define your flags and configuration settings.
// Cobra supports Persistent Flags which will work for this command
// and all subcommands, e.g.:
// createCmd.PersistentFlags().String("foo", "", "A help for foo")
// Cobra supports local flags which will only run when this command
// is called directly, e.g.:
// createCmd.Flags().BoolP("toggle", "t", false, "Help message for toggle")
createCmd.Flags().BoolP("inspect", "i", false, "Enable HTTP inspection on tunnel")
}

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package cmd
import (
"errors"
"fmt"
"strconv"
"github.com/spf13/cobra"
)
// deleteCmd represents the delete command
var deleteCmd = &cobra.Command{
Use: "delete <port>",
Short: "Close tunnel to specified local port",
RunE: func(cmd *cobra.Command, args []string) error {
if len(args) != 1 {
return errors.New("Port not specified")
}
port, err := strconv.Atoi(args[0])
if err != nil {
return fmt.Errorf("Port %q is not a valid integer: %s", args[0], err)
}
name := fmt.Sprintf("expose_%d", port)
tun, err := client.GetTunnelByName(name)
if err != nil {
return fmt.Errorf("There is no active tunnel for port %d", port)
}
if err := client.StopTunnel(tun.Name); err != nil {
return fmt.Errorf("Unable to stop tunnel %q: %s", tun.Name, err)
}
fmt.Printf("Successfully closed tunnel %q to address %q.\n", tun.Name, tun.Config.Addr)
return nil
},
}
func init() {
RootCmd.AddCommand(deleteCmd)
// Here you will define your flags and configuration settings.
// Cobra supports Persistent Flags which will work for this command
// and all subcommands, e.g.:
// deleteCmd.PersistentFlags().String("foo", "", "A help for foo")
// Cobra supports local flags which will only run when this command
// is called directly, e.g.:
// deleteCmd.Flags().BoolP("toggle", "t", false, "Help message for toggle")
}

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package cmd
import (
"fmt"
"os"
"github.com/olekukonko/tablewriter"
"github.com/spf13/cobra"
)
// listCmd represents the list command
var listCmd = &cobra.Command{
Use: "list",
Short: "List all currently active tunnels",
RunE: func(cmd *cobra.Command, args []string) error {
tunnels, err := client.ListTunnels()
if err != nil {
return err
}
if len(tunnels) == 0 {
fmt.Println("No tunnels are active right now.")
return nil
}
table := tablewriter.NewWriter(os.Stdout)
table.SetHeader([]string{"Name", "Type", "Address", "Public URL"})
table.SetBorder(false)
for _, tun := range tunnels {
table.Append([]string{
tun.Name,
tun.Proto,
tun.Config.Addr,
tun.PublicURL,
})
}
table.Render()
return nil
},
}
func init() {
RootCmd.AddCommand(listCmd)
// Here you will define your flags and configuration settings.
// Cobra supports Persistent Flags which will work for this command
// and all subcommands, e.g.:
// listCmd.PersistentFlags().String("foo", "", "A help for foo")
// Cobra supports local flags which will only run when this command
// is called directly, e.g.:
// listCmd.Flags().BoolP("toggle", "t", false, "Help message for toggle")
}

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package cmd
import (
"fmt"
"os"
"github.com/Luzifer/expose/ngrok2"
"github.com/spf13/cobra"
)
var client *ngrok2.Client
// RootCmd represents the base command when called without any subcommands
var RootCmd = &cobra.Command{
Use: "expose",
Short: "Control ngrok dameon with simple CLI commands",
PersistentPreRunE: func(cmd *cobra.Command, args []string) error {
client = ngrok2.New()
baseURL, err := cmd.Flags().GetString("api-base")
if err != nil {
return err
}
client.BaseURL = baseURL
return nil
},
}
// Execute adds all child commands to the root command sets flags appropriately.
// This is called by main.main(). It only needs to happen once to the rootCmd.
func Execute() {
if err := RootCmd.Execute(); err != nil {
fmt.Println(err)
os.Exit(-1)
}
}
func init() {
// Here you will define your flags and configuration settings.
// Cobra supports Persistent Flags, which, if defined here,
// will be global for your application.
// RootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (default is $HOME/.expose.yaml)")
// Cobra also supports local flags, which will only run
// when this action is called directly.
RootCmd.PersistentFlags().String("api-base", "http://localhost:4040", "Base URL to contact the ngrok daemon")
}

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package cmd
import (
"fmt"
"net"
"net/http"
"os"
"os/signal"
"github.com/Luzifer/expose/ngrok2"
"github.com/spf13/cobra"
)
// serveCmd represents the serve command
var serveCmd = &cobra.Command{
Use: "serve",
Short: "A brief description of your command",
RunE: func(cmd *cobra.Command, args []string) error {
listener, err := net.Listen("tcp", "127.0.0.1:0")
if err != nil {
return fmt.Errorf("Unable to bind local HTTP server: %s", err)
}
_, port, err := net.SplitHostPort(listener.Addr().String())
if err != nil {
return fmt.Errorf("Unable to determine bound port: %s", err)
}
name := fmt.Sprintf("expose_%s", port)
if tun, err := client.GetTunnelByName(name); err == nil {
return fmt.Errorf("Address %q already has an active tunnel with URL %s", tun.Config.Addr, tun.PublicURL)
}
tun, err := client.CreateTunnel(ngrok2.CreateTunnelInput{
Name: name,
Addr: port,
Proto: "http",
BindTLS: "true",
Inspect: false,
})
if err != nil {
return fmt.Errorf("Unable to create tunnel: %s", err)
}
go http.Serve(listener, http.FileServer(http.Dir(".")))
fmt.Printf("Created HTTP server for this directory with URL %s\nPress Ctrl+C to stop server and tunnel", tun.PublicURL)
c := make(chan os.Signal, 1)
signal.Notify(c, os.Interrupt)
for range c {
if err := client.StopTunnel(tun.Name); err != nil {
return fmt.Errorf("Unable to stop tunnel %q: %s", tun.Name, err)
}
fmt.Printf("\nSuccessfully stopped server and tunnel.\n")
return nil
}
return nil
},
}
func init() {
RootCmd.AddCommand(serveCmd)
// Here you will define your flags and configuration settings.
// Cobra supports Persistent Flags which will work for this command
// and all subcommands, e.g.:
// serveCmd.PersistentFlags().String("foo", "", "A help for foo")
// Cobra supports local flags which will only run when this command
// is called directly, e.g.:
// serveCmd.Flags().BoolP("toggle", "t", false, "Help message for toggle")
}

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[Unit]
Description=ngrok port forwarding
After=network-online.target
[Service]
TimeoutStartSec=0
TimeoutStopSec=0
Restart=on-failure
RestartSec=5
ExecStart=/usr/local/bin/ngrok start --none
[Install]
WantedBy=multi-user.target

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package main
import "github.com/Luzifer/expose/cmd"
func main() {
cmd.Execute()
}

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package ngrok2
import (
"bytes"
"context"
"encoding/json"
"fmt"
"net/http"
"time"
)
const (
defaultBaseURL = "http://localhost:4040"
defaultRequestTimeout = 5 * time.Second
)
// Client represents the API of the ngrok2 daemon
type Client struct {
HTTPClient *http.Client
BaseURL string
RequestTimeout time.Duration
}
// New creates a new Client with default settings
func New() *Client {
return &Client{
HTTPClient: http.DefaultClient,
BaseURL: defaultBaseURL,
RequestTimeout: defaultRequestTimeout,
}
}
func (c *Client) do(method, subPath string, payload interface{}, response interface{}) error {
var (
req *http.Request
urlStr = c.BaseURL + subPath
)
if payload != nil {
buf := bytes.NewBufferString("")
if err := json.NewEncoder(buf).Encode(payload); err != nil {
return fmt.Errorf("Unable to encode payload: %s", err)
}
req, _ = http.NewRequest(method, urlStr, buf)
} else {
req, _ = http.NewRequest(method, urlStr, nil)
}
req.Header.Set("Content-Type", "application/json")
ctx, cancel := context.WithTimeout(context.Background(), c.RequestTimeout)
defer cancel()
resp, err := c.HTTPClient.Do(req.WithContext(ctx))
if err != nil {
return fmt.Errorf("Unable to execute request: %s", err)
}
defer resp.Body.Close()
if resp.StatusCode >= 400 {
return fmt.Errorf("Received unexpected status code %d on request.", resp.StatusCode)
}
if response != nil {
if err := json.NewDecoder(resp.Body).Decode(response); err != nil {
return fmt.Errorf("Unable to decode response: %s", err)
}
}
return nil
}

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package ngrok2
// Tunnel represents one open tunnel in the daemon
type Tunnel struct {
Name string `json:"name"`
URI string `json:"uri"`
PublicURL string `json:"public_url"`
Proto string `json:"proto"`
Config struct {
Addr string `json:"addr"`
Inspect bool `json:"inspect"`
} `json:"config"`
Metrics TunnelMetrics `json:"metrics"`
}
// TunnelMetrics contains details about the tunnel
type TunnelMetrics struct {
HTTP struct {
Count int64 `json:"count"`
Rate1 float64 `json:"rate1"`
Rate5 float64 `json:"rate5"`
Rate15 float64 `json:"rate15"`
P50 float64 `json:"p50"`
P90 float64 `json:"p90"`
P95 float64 `json:"p95"`
P99 float64 `json:"p99"`
} `json:"http"`
Conns struct {
Count int64 `json:"count"`
Gauge int64 `json:"gauge"`
Rate1 float64 `json:"rate1"`
Rate5 float64 `json:"rate5"`
Rate15 float64 `json:"rate15"`
P50 float64 `json:"p50"`
P90 float64 `json:"p90"`
P95 float64 `json:"p95"`
P99 float64 `json:"p99"`
} `json:"conns"`
}
// CreateTunnelInput represents all options possible to be set on a tunnel
type CreateTunnelInput struct {
// [required, all] Name of the tunnel to create
Name string `json:"name"`
// [required, all] tunnel protocol name, one of `http`, `tcp`, `tls`
Proto string `json:"proto"`
// [required, all] forward traffic to this local port number or network address
Addr string `json:"addr"`
// [all] enable http request inspection
Inspect bool `json:"inspect,omitempty"`
// [http] HTTP basic authentication credentials to enforce on tunneled requests `username:password`
Auth string `json:"auth,omitempty"`
// [http] Rewrite the HTTP Host header to this value, or `preserve` to leave it unchanged
HostHeader string `json:"host_header,omitempty"`
// [http] bind an HTTPS or HTTP endpoint or both `true`, `false`, or `both`
BindTLS string `json:"bind_tls,omitempty"`
// [http, tls] subdomain name to request. If unspecified, uses the tunnel name
Subdomain string `json:"subdomain,omitempty"`
// [http, tls] hostname to request (requires reserved name and DNS CNAME)
Hostname string `json:"hostname,omitempty"`
// [tls] PEM TLS certificate at this path to terminate TLS traffic before forwarding locally
CRT string `json:"crt,omitempty"`
// [tls] PEM TLS private key at this path to terminate TLS traffic before forwarding locally
Key string `json:"key,omitempty"`
// [tls] PEM TLS certificate authority at this path will verify incoming TLS client connection certificates.
ClientCAS string `json:"client_cas,omitempty"`
// [tcp] bind the remote TCP port on the given address
RemoteAddr string `json:"remote_addr,omitempty"`
}
// ListTunnels returns a slice of all known open tunnels in the daemon
func (c *Client) ListTunnels() ([]Tunnel, error) {
var envelope = struct {
Tunnels []Tunnel `json:"tunnels"`
}{}
return envelope.Tunnels, c.do("GET", "/api/tunnels", nil, &envelope)
}
// GetTunnelByName retrieves details for a specific tunnel by its name
func (c *Client) GetTunnelByName(name string) (Tunnel, error) {
resp := Tunnel{}
return resp, c.do("GET", "/api/tunnels/"+name, nil, &resp)
}
// StopTunnel closes a tunnel by its name
func (c *Client) StopTunnel(name string) error {
return c.do("DELETE", "/api/tunnels/"+name, nil, nil)
}
// CreateTunnel starts a new tunnel for given protocol and address
// See https://ngrok.com/docs#tunnel-definitions for details
func (c *Client) CreateTunnel(tunnelOpts CreateTunnelInput) (Tunnel, error) {
resp := Tunnel{}
return resp, c.do("POST", "/api/tunnels", tunnelOpts, &resp)
}