|
| 1 | +package main |
| 2 | + |
| 3 | +import ( |
| 4 | + "bufio" |
| 5 | + "crypto/rand" |
| 6 | + "encoding/base64" |
| 7 | + "encoding/json" |
| 8 | + "errors" |
| 9 | + "flag" |
| 10 | + "fmt" |
| 11 | + "io" |
| 12 | + "log" |
| 13 | + "net/http" |
| 14 | + "net/url" |
| 15 | + "os" |
| 16 | + "strings" |
| 17 | + |
| 18 | + "golang.org/x/crypto/nacl/box" |
| 19 | +) |
| 20 | + |
| 21 | +type repoPublicKey struct { |
| 22 | + ID string `json:"key_id"` |
| 23 | + Key string `json:"key"` |
| 24 | +} |
| 25 | + |
| 26 | +type secretPayload struct { |
| 27 | + EncryptedValue string `json:"encrypted_value"` |
| 28 | + KeyID string `json:"key_id"` |
| 29 | +} |
| 30 | + |
| 31 | +func main() { |
| 32 | + var ( |
| 33 | + flagOwner = flag.String("owner", "", "GitHub repository owner or organization") |
| 34 | + flagRepo = flag.String("repo", "", "GitHub repository name") |
| 35 | + flagSecretName = flag.String("secret", "", "Secret name to create or update") |
| 36 | + flagValue = flag.String("value", "", "Secret value (if empty, read from stdin)") |
| 37 | + flagValueEnv = flag.String("value-from-env", "", "Environment variable to read secret value from") |
| 38 | + flagAPIBase = flag.String("api-url", "", "GitHub API base URL (default: https://api.github.com or $GITHUB_API_URL)") |
| 39 | + ) |
| 40 | + |
| 41 | + flag.Parse() |
| 42 | + |
| 43 | + if *flagOwner == "" || *flagRepo == "" || *flagSecretName == "" { |
| 44 | + flag.Usage() |
| 45 | + os.Exit(1) |
| 46 | + } |
| 47 | + |
| 48 | + apiBase := resolveAPIBase(*flagAPIBase) |
| 49 | + token, err := resolveToken() |
| 50 | + if err != nil { |
| 51 | + log.Fatalf("cannot resolve GitHub token: %v", err) |
| 52 | + } |
| 53 | + |
| 54 | + secretValue, err := resolveSecretValue(*flagValueEnv, *flagValue) |
| 55 | + if err != nil { |
| 56 | + log.Fatalf("cannot resolve secret value: %v", err) |
| 57 | + } |
| 58 | + |
| 59 | + if err := setRepoSecret(apiBase, token, *flagOwner, *flagRepo, *flagSecretName, secretValue); err != nil { |
| 60 | + log.Fatalf("failed to set secret: %v", err) |
| 61 | + } |
| 62 | + |
| 63 | + fmt.Printf("Secret %s updated for %s/%s\n", *flagSecretName, *flagOwner, *flagRepo) |
| 64 | +} |
| 65 | + |
| 66 | +func resolveAPIBase(flagValue string) string { |
| 67 | + candidates := []string{ |
| 68 | + strings.TrimSpace(flagValue), |
| 69 | + strings.TrimSpace(os.Getenv("GITHUB_API_URL")), |
| 70 | + } |
| 71 | + |
| 72 | + for _, c := range candidates { |
| 73 | + if c != "" { |
| 74 | + return strings.TrimRight(c, "/") |
| 75 | + } |
| 76 | + } |
| 77 | + |
| 78 | + return "https://api.github.com" |
| 79 | +} |
| 80 | + |
| 81 | +func resolveToken() (string, error) { |
| 82 | + for _, name := range []string{"GITHUB_TOKEN", "GH_TOKEN"} { |
| 83 | + if v := strings.TrimSpace(os.Getenv(name)); v != "" { |
| 84 | + return v, nil |
| 85 | + } |
| 86 | + } |
| 87 | + return "", errors.New("no token found; set GITHUB_TOKEN or GH_TOKEN") |
| 88 | +} |
| 89 | + |
| 90 | +func resolveSecretValue(fromEnv, fromFlag string) (string, error) { |
| 91 | + if fromEnv != "" { |
| 92 | + v := os.Getenv(fromEnv) |
| 93 | + if v == "" { |
| 94 | + return "", fmt.Errorf("environment variable %s is not set or empty", fromEnv) |
| 95 | + } |
| 96 | + return v, nil |
| 97 | + } |
| 98 | + |
| 99 | + if fromFlag != "" { |
| 100 | + return fromFlag, nil |
| 101 | + } |
| 102 | + |
| 103 | + info, err := os.Stdin.Stat() |
| 104 | + if err != nil { |
| 105 | + return "", err |
| 106 | + } |
| 107 | + |
| 108 | + if info.Mode()&os.ModeCharDevice != 0 { |
| 109 | + fmt.Fprintln(os.Stderr, "Enter secret value, then press Ctrl+D:") |
| 110 | + } |
| 111 | + |
| 112 | + reader := bufio.NewReader(os.Stdin) |
| 113 | + var b strings.Builder |
| 114 | + |
| 115 | + for { |
| 116 | + line, err := reader.ReadString('\n') |
| 117 | + b.WriteString(line) |
| 118 | + if err != nil { |
| 119 | + if errors.Is(err, io.EOF) { |
| 120 | + break |
| 121 | + } |
| 122 | + return "", err |
| 123 | + } |
| 124 | + } |
| 125 | + |
| 126 | + value := strings.TrimRight(b.String(), "\r\n") |
| 127 | + if value == "" { |
| 128 | + return "", errors.New("secret value is empty") |
| 129 | + } |
| 130 | + return value, nil |
| 131 | +} |
| 132 | + |
| 133 | +func setRepoSecret(apiBase, token, owner, repo, name, value string) error { |
| 134 | + pubKey, err := getRepoPublicKey(apiBase, token, owner, repo) |
| 135 | + if err != nil { |
| 136 | + return fmt.Errorf("get repo public key: %w", err) |
| 137 | + } |
| 138 | + |
| 139 | + encrypted, err := encryptWithPublicKey(pubKey.Key, value) |
| 140 | + if err != nil { |
| 141 | + return fmt.Errorf("encrypt secret: %w", err) |
| 142 | + } |
| 143 | + |
| 144 | + return putRepoSecret(apiBase, token, owner, repo, name, pubKey.ID, encrypted) |
| 145 | +} |
| 146 | + |
| 147 | +func getRepoPublicKey(apiBase, token, owner, repo string) (*repoPublicKey, error) { |
| 148 | + endpoint := fmt.Sprintf("%s/repos/%s/%s/actions/secrets/public-key", apiBase, owner, repo) |
| 149 | + |
| 150 | + req, err := http.NewRequest(http.MethodGet, endpoint, nil) |
| 151 | + if err != nil { |
| 152 | + return nil, err |
| 153 | + } |
| 154 | + addGitHubHeaders(req, token) |
| 155 | + |
| 156 | + resp, err := http.DefaultClient.Do(req) |
| 157 | + if err != nil { |
| 158 | + return nil, err |
| 159 | + } |
| 160 | + defer resp.Body.Close() |
| 161 | + |
| 162 | + if resp.StatusCode != http.StatusOK { |
| 163 | + body, _ := io.ReadAll(resp.Body) |
| 164 | + return nil, fmt.Errorf("GitHub API %s: %s", resp.Status, string(body)) |
| 165 | + } |
| 166 | + |
| 167 | + var key repoPublicKey |
| 168 | + if err := json.NewDecoder(resp.Body).Decode(&key); err != nil { |
| 169 | + return nil, err |
| 170 | + } |
| 171 | + if key.ID == "" || key.Key == "" { |
| 172 | + return nil, errors.New("public key response missing key_id or key") |
| 173 | + } |
| 174 | + return &key, nil |
| 175 | +} |
| 176 | + |
| 177 | +func encryptWithPublicKey(publicKeyB64, plaintext string) (string, error) { |
| 178 | + raw, err := base64.StdEncoding.DecodeString(publicKeyB64) |
| 179 | + if err != nil { |
| 180 | + return "", fmt.Errorf("decode public key: %w", err) |
| 181 | + } |
| 182 | + if len(raw) != 32 { |
| 183 | + return "", fmt.Errorf("unexpected public key length: %d", len(raw)) |
| 184 | + } |
| 185 | + |
| 186 | + var pk [32]byte |
| 187 | + copy(pk[:], raw) |
| 188 | + |
| 189 | + ciphertext, err := box.SealAnonymous(nil, []byte(plaintext), &pk, rand.Reader) |
| 190 | + if err != nil { |
| 191 | + return "", fmt.Errorf("nacl encryption failed: %w", err) |
| 192 | + } |
| 193 | + |
| 194 | + return base64.StdEncoding.EncodeToString(ciphertext), nil |
| 195 | +} |
| 196 | + |
| 197 | +func putRepoSecret(apiBase, token, owner, repo, name, keyID, encryptedValue string) error { |
| 198 | + endpoint := fmt.Sprintf("%s/repos/%s/%s/actions/secrets/%s", |
| 199 | + apiBase, owner, repo, url.PathEscape(name)) |
| 200 | + |
| 201 | + body, err := json.Marshal(secretPayload{ |
| 202 | + EncryptedValue: encryptedValue, |
| 203 | + KeyID: keyID, |
| 204 | + }) |
| 205 | + if err != nil { |
| 206 | + return err |
| 207 | + } |
| 208 | + |
| 209 | + req, err := http.NewRequest(http.MethodPut, endpoint, strings.NewReader(string(body))) |
| 210 | + if err != nil { |
| 211 | + return err |
| 212 | + } |
| 213 | + addGitHubHeaders(req, token) |
| 214 | + req.Header.Set("Content-Type", "application/json") |
| 215 | + |
| 216 | + resp, err := http.DefaultClient.Do(req) |
| 217 | + if err != nil { |
| 218 | + return err |
| 219 | + } |
| 220 | + defer resp.Body.Close() |
| 221 | + |
| 222 | + if resp.StatusCode != http.StatusNoContent && resp.StatusCode != http.StatusCreated { |
| 223 | + b, _ := io.ReadAll(resp.Body) |
| 224 | + return fmt.Errorf("GitHub API %s: %s", resp.Status, string(b)) |
| 225 | + } |
| 226 | + |
| 227 | + return nil |
| 228 | +} |
| 229 | + |
| 230 | +func addGitHubHeaders(req *http.Request, token string) { |
| 231 | + req.Header.Set("Accept", "application/vnd.github+json") |
| 232 | + req.Header.Set("Authorization", "Bearer "+token) |
| 233 | + if req.Header.Get("X-GitHub-Api-Version") == "" { |
| 234 | + req.Header.Set("X-GitHub-Api-Version", "2022-11-28") |
| 235 | + } |
| 236 | +} |
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