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fix(api): cap the GitHub webhook request body size #353

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fix(api): cap the GitHub webhook request body size #353

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10 changes: 10 additions & 0 deletions apps/api/internal/handler/integration.go
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Original file line number Diff line number Diff line change
Expand Up @@ -501,8 +501,18 @@ func (h *IntegrationHandler) GitHubIssueSummary(c *gin.Context) {
// auth — authentication is the HMAC signature in X-Hub-Signature-256.
// POST /webhooks/github
func (h *IntegrationHandler) GitHubWebhook(c *gin.Context) {
// This route is public (auth is the HMAC signature). Cap the body before
// reading it so an unauthenticated client can't exhaust memory with a huge
// payload. GitHub caps webhook deliveries at 25 MiB.
const maxWebhookBody = 25 << 20
c.Request.Body = http.MaxBytesReader(c.Writer, c.Request.Body, maxWebhookBody)
body, err := io.ReadAll(c.Request.Body)
if err != nil {
var tooLarge *http.MaxBytesError
if errors.As(err, &tooLarge) {
c.JSON(http.StatusRequestEntityTooLarge, gin.H{"error": "Payload too large"})
return
}
c.JSON(http.StatusBadRequest, gin.H{"error": "Failed to read body"})
return
}
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