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package main
import (
"context"
"encoding/base64"
"flag"
"fmt"
"io/ioutil"
"log"
"os"
"path/filepath"
"strings"
"github.com/google/go-github/github"
"github.com/tcnksm/go-gitconfig"
"golang.org/x/crypto/ssh"
"golang.org/x/oauth2"
)
var (
defaultPublicKeyPath = filepath.Join(os.Getenv("HOME"), ".ssh", "id_rsa.pub")
)
func main() {
sshkey := flag.String("ssh-key", defaultPublicKeyPath, "Path to the ssh public key to upload")
flag.Parse()
keyContent, keyTitle, err := readPublicKey(sshkey)
if err != nil {
log.Fatal(err)
}
keyToGitHub(keyContent, keyTitle)
}
// readPublicKey reads the public key, ensure it's in the proper
// format to prevent sending incorrect data, and returns the content
// of the key (the whole content) and the last field of the key that
// will be used as the title.
func readPublicKey(sshkey *string) (string, string, error) {
// first, let's ensure it's a public key, so we don't upload
// something incorrect.
data, err := ioutil.ReadFile(*sshkey)
if err != nil {
return "", "", fmt.Errorf("failed to open %s: %v", *sshkey, err)
}
// we only want the content of the key to be parsed, not all the fields
fields := strings.Fields(string(data))
if len(fields) < 2 {
return "", "", fmt.Errorf("not enough fields in public key %s (%d)", *sshkey, len(fields))
}
raw, err := base64.StdEncoding.DecodeString(fields[1])
if err != nil {
return "", "", fmt.Errorf("failed to read the second field in the public key %s: %v", *sshkey, err)
}
_, err = ssh.ParsePublicKey(raw)
if err != nil {
return "", "", fmt.Errorf("%s is not a valid public key: %v", *sshkey, err)
}
return strings.TrimSuffix(string(data), "\n"), fields[2], nil
}
// If the key does not exists already on GitHub, upload it, using the
// signature (last part of the key) as the title.
func keyToGitHub(keyContent, keyTitle string) {
user, err := gitconfig.Global("github.user")
if err != nil {
fmt.Fprintf(os.Stderr, "github: failed to get the username: %v", err)
return
}
token, err := gitconfig.Global("github.tokensshtoforge")
if err != nil {
fmt.Fprintf(os.Stderr, "github: failed to get the token: %v", err)
return
}
ctx := context.Background()
ts := oauth2.StaticTokenSource(&oauth2.Token{AccessToken: token})
tc := oauth2.NewClient(ctx, ts)
client := github.NewClient(tc)
keys, _, err := client.Users.ListKeys(ctx, user, nil)
if err != nil {
fmt.Fprintf(os.Stderr, "github: failed to get the list of existing keys: %v", err)
return
}
skip := false
for _, k := range keys {
ghKey := *k.Key + " " + keyTitle
c := strings.Compare(ghKey, keyContent)
if c == 0 {
skip = true
break
}
}
if !skip {
key := github.Key{
Key: &keyContent,
Title: &keyTitle,
}
_, _, err := client.Users.CreateKey(ctx, &key)
if err != nil {
fmt.Fprintf(os.Stderr, "github: failed to upload the ssh public key: %+v", err)
return
}
}
}
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