45 lines
1.3 KiB
Go
45 lines
1.3 KiB
Go
// backend/internal/naming.go
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package internal
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import (
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"fmt"
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"path/filepath"
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"regexp"
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"strings"
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"time"
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)
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var (
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descMax = 64
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allowedDesc = regexp.MustCompile(`[^A-Za-z0-9 _-]`) // to be replaced by `_`
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dateOnly = regexp.MustCompile(`^\d{4}-\d{2}-\d{2}$`) // UI sends YYYY-MM-DD
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finalNameValidate = regexp.MustCompile(`^\d{4}\.\d{2}\.\d{2}\.[A-Za-z0-9_-]{1,64}\.[A-Za-z0-9]{1,8}$`)
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)
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func SanitizeDesc(in string) string {
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s := strings.TrimSpace(in)
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if s == "" { s = "upload" }
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s = allowedDesc.ReplaceAllString(s, "_")
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s = strings.Join(strings.Fields(s), "_") // collapse whitespace
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if len(s) > descMax { s = s[:descMax] }
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return s
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}
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func ComposeFinalName(dateStr, desc, origFilename string) (string, error) {
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ext := strings.ToLower(strings.TrimPrefix(filepath.Ext(origFilename), "."))
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if ext == "" { ext = "bin" }
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var t time.Time
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var err error
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if dateOnly.MatchString(dateStr) {
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t, err = time.Parse("2006-01-02", dateStr)
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} else {
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t = time.Now()
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}
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if err != nil { return "", fmt.Errorf("bad date") }
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final := fmt.Sprintf("%04d.%02d.%02d.%s.%s", t.Year(), int(t.Month()), t.Day(), SanitizeDesc(desc), ext)
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if !finalNameValidate.MatchString(final) { return "", fmt.Errorf("invalid final name") }
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return final, nil
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}
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