42 lines
1.2 KiB
Go
42 lines
1.2 KiB
Go
package storage
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import (
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"errors"
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"path"
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"strings"
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)
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// normalizeDeletePrefix rejects requests that could accidentally target the
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// storage root and returns the canonical key form used by all backends.
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func normalizeDeletePrefix(prefix string) (string, error) {
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prefix = strings.TrimSpace(strings.ReplaceAll(prefix, "\\", "/"))
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prefix = strings.Trim(prefix, "/")
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if prefix == "" {
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return "", errors.New("storage delete prefix is required")
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}
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for _, part := range strings.Split(prefix, "/") {
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if part == ".." {
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return "", errors.New("invalid storage delete prefix")
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}
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}
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clean := path.Clean(prefix)
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if clean == "." || clean == ".." || strings.HasPrefix(clean, "../") {
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return "", errors.New("invalid storage delete prefix")
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}
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return clean, nil
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}
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// advanceDeletePrefixCursor prevents a backend that reports a truncated page
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// without a new cursor from making DeletePrefix loop forever.
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func advanceDeletePrefixCursor(current, next string, more bool) (string, error) {
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if !more {
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return "", nil
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}
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current = strings.TrimSpace(current)
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next = strings.TrimSpace(next)
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if next == "" || next == current {
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return "", errors.New("storage delete prefix pagination made no progress")
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}
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return next, nil
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}
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