diff options
Diffstat (limited to 'misc_utils.go')
-rw-r--r-- | misc_utils.go | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/misc_utils.go b/misc_utils.go new file mode 100644 index 0000000..4830fc1 --- /dev/null +++ b/misc_utils.go @@ -0,0 +1,54 @@ +/* + * Utility functions + * + * Copyright (C) 2024 Runxi Yu <https://runxiyu.org> + * SPDX-License-Identifier: AGPL-3.0-or-later + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU Affero General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Affero General Public License for more details. + * + * You should have received a copy of the GNU Affero General Public License + * along with this program. If not, see <https://www.gnu.org/licenses/>. + */ + +package main + +import ( + "crypto/rand" + "encoding/base64" + "fmt" + "log" + "net/http" +) + +func wstr(w http.ResponseWriter, code int, msg string) { + w.Header().Set("Content-Type", "text/plain; charset=utf-8") + w.WriteHeader(code) + _, err := w.Write([]byte(msg)) + if err != nil { + log.Printf("Error wstr'ing to writer: %v", err) + } +} + +/* + * Generate a random url-safe string. + * Note that the "sz" parameter specifies the number of bytes taken from the + * random source divided by three and does NOT represent the length of the + * encoded string. It's divided by three because we're using base64 and it's + * ideal to ensure that the entropy remains consistent throughout the string. + */ +func randomString(sz int) (string, error) { + r := make([]byte, 3*sz) + _, err := rand.Read(r) + if err != nil { + return "", fmt.Errorf("%w: %w", errCannotGenerateRandomString, err) + } + return base64.RawURLEncoding.EncodeToString(r), nil +} |