31 lines
619 B
Go
31 lines
619 B
Go
package catalog
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import (
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"encoding/hex"
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"fmt"
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"strings"
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)
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func (c *CatalogImage) SHA256() (string, error) {
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if c.Checksum == "" {
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return "", fmt.Errorf("checksum is empty")
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}
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const prefix = "sha256:"
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if !strings.HasPrefix(c.Checksum, prefix) {
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return "", fmt.Errorf("unsupported checksum format (expected sha256:...)")
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}
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hash := strings.TrimPrefix(c.Checksum, prefix)
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if len(hash) != 64 {
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return "", fmt.Errorf("invalid sha256 length: got %d, want 64", len(hash))
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}
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if _, err := hex.DecodeString(hash); err != nil {
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return "", fmt.Errorf("invalid sha256 hex: %w", err)
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}
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return hash, nil
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}
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