57 lines
1.4 KiB
Go
57 lines
1.4 KiB
Go
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package routing
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import (
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"fmt"
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"regexp"
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"strings"
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)
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// validateCronExpression validates a cron expression (simplified)
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// Supports standard 5-field cron: minute hour day month weekday
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// Does NOT validate all possible edge cases - just basic format
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func validateCronExpression(expr string) error {
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fields := strings.Fields(expr)
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if len(fields) != 5 {
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return fmt.Errorf("cron expression must have 5 fields (minute hour day month weekday), got %d", len(fields))
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}
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// Validate field ranges
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ranges := []struct {
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name string
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min int
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max int
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}{
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{"minute", 0, 59},
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{"hour", 0, 23},
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{"day", 1, 31},
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{"month", 1, 12},
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{"weekday", 0, 6},
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}
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// Basic pattern: * or */n or n or n-m or n,m or n-m/p
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// This is simplified and doesn't validate all edge cases
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fieldRegex := regexp.MustCompile(`^(\*|(\d+)(,(\d+))*(\/\d+)?|(\d+)-(\d+)(\/\d+)?|\*\/\d+)$`)
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for i, field := range fields {
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if field == "*" {
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continue
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}
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// Check basic format
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if !fieldRegex.MatchString(field) {
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return fmt.Errorf("invalid %s field: %s", ranges[i].name, field)
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}
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// Validate simple number values
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if !strings.ContainsAny(field, "*,-/") {
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var val int
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_, _ = fmt.Sscanf(field, "%d", &val)
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if val < ranges[i].min || val > ranges[i].max {
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return fmt.Errorf("invalid %s value %d (range %d-%d)", ranges[i].name, val, ranges[i].min, ranges[i].max)
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}
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}
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}
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return nil
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}
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