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caddyfile: Fix case where heredoc marker is empty after newline (#5769)

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Fixes `panic: runtime error: slice bounds out of range [:3] with capacity 2`

Co-authored-by: Matt Holt <mholt@users.noreply.github.com>
This commit is contained in:
Francis Lavoie 2023-08-23 23:27:57 -04:00 • committed by GitHub
parent 888c6d7e93
commit 7103ea096f
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4
caddyconfig/caddyfile/lexer.go
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@ -154,6 +154,10 @@ func (l *lexer) next() (bool, error) {
// we reset the val because the heredoc is syntax we don't
// want to keep.
if ch == '\n' {
if len(val) == 2 {
return false, fmt.Errorf("missing opening heredoc marker on line #%d; must contain only alpha-numeric characters, dashes and underscores; got empty string", l.line)
}
// check if there's too many <
if string(val[:3]) == "<<<" {
return false, fmt.Errorf("too many '<' for heredoc on line #%d; only use two, for example <<END", l.line)