4c57d201a4
The source headers, LICENSE files, and license metadata had drifted apart. Align the entire project to MIT: - Convert every source-file header to the MIT text across all comment styles (Go, TS, TSX, JS, MJS, SQL, CSS, GraphQL, shell), including SPDX-License-Identifier tags - Set the root and cookie-banner LICENSE files to the MIT text with a "MIT License" title line - Switch the package.json license fields, Docker image label, and cookie-banner README to MIT - Update docs and the genmodels header generator accordingly - Normalize copyright lines to a single format (Copyright (c) <year(s)> Probo Inc <hello@probo.com>.): unify the hello@getprobo.com and hello@probo.inc emails to hello@probo.com and the comma-separated years to a hyphenated range Genuine third-party references are intentionally left untouched: the Lucide icon attributions (Lucide is ISC) and the trivy dependency license allowlist. Signed-off-by: Sacha Al Himdani <sacha@probo.com>
64 lines
2.1 KiB
Go
64 lines
2.1 KiB
Go
// Copyright (c) 2025-2026 Probo Inc <hello@probo.com>.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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package slack
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import (
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"crypto/hmac"
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"crypto/sha256"
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"encoding/hex"
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"fmt"
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"strconv"
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"time"
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)
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// VerifySignature implements the verification algorithm described in https://api.slack.com/authentication/verifying-requests-from-slack
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func VerifySignature(signingSecret, timestamp, signature string, body []byte) error {
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// Check timestamp to prevent replay attacks
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ts, err := strconv.ParseInt(timestamp, 10, 64)
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if err != nil {
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return fmt.Errorf("invalid timestamp: %w", err)
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}
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now := time.Now().Unix()
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if abs(now-ts) > 60*5 { // 5 minutes
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return fmt.Errorf("request timestamp too old")
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}
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baseString := fmt.Sprintf("v0:%s:%s", timestamp, body)
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h := hmac.New(sha256.New, []byte(signingSecret))
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h.Write([]byte(baseString))
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expected := "v0=" + hex.EncodeToString(h.Sum(nil))
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if !hmac.Equal([]byte(expected), []byte(signature)) {
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return fmt.Errorf("signature mismatch")
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}
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return nil
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}
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func abs(n int64) int64 {
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if n < 0 {
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return -n
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}
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return n
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}
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