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package main
import (
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"os"
"path"
"strings"
"time"
)
func main() {
if len(os.Args) != 2 {
fmt.Fprintln(os.Stderr, "no home directory provided")
os.Exit(1)
}
homedir := os.Args[1]
users, err := getUsers(homedir)
if err != nil {
if os.IsNotExist(err) {
os.Exit(0)
} else {
fmt.Fprintf(os.Stderr, "could not read authorized_github_users: %v\n", err)
os.Exit(1)
}
}
keys, err := getUserKeys(users)
if err != nil {
fmt.Fprintf(os.Stderr, "could not get public keys: %v\n", err)
os.Exit(1)
}
for _, key := range keys {
fmt.Println(key)
}
os.Exit(0)
}
func getUsers(homedir string) ([]string, error) {
filepath := path.Join(homedir, ".ssh", "authorized_github_users")
data, err := ioutil.ReadFile(filepath)
if err != nil {
return nil, err
}
lines := strings.Split(string(data), "\n")
users := map[string]struct{}{}
for _, line := range lines {
trimmed := strings.TrimSpace(line)
if len(trimmed) > 0 && !strings.HasPrefix(trimmed, "#") {
users[trimmed] = struct{}{}
}
}
uniqueUsers := []string{}
for user := range users {
uniqueUsers = append(uniqueUsers, user)
}
return uniqueUsers, nil
}
// GHKey is a key structure from the GitHub REST API
type GHKey struct {
ID int `json:"id"`
Key string `json:"key"`
}
func getUserKeys(users []string) ([]string, error) {
client := &http.Client{Timeout: 5 * time.Second}
keys := []string{}
for _, user := range users {
url := fmt.Sprintf("https://api.github.com/users/%s/keys", user)
res, err := client.Get(url)
if err != nil {
return nil, err
}
if res.StatusCode != http.StatusOK {
return nil, fmt.Errorf("error fetching keys: got http %d %s", res.StatusCode, res.Status)
}
data, err := ioutil.ReadAll(res.Body)
defer res.Body.Close()
if err != nil {
return nil, err
}
userKeys := []GHKey{}
if err := json.Unmarshal(data, &userKeys); err != nil {
return nil, err
}
for _, userKey := range userKeys {
keys = append(keys, userKey.Key)
}
}
return keys, nil
}
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