package jnpf.dmsPermission;
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import lombok.AllArgsConstructor;
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import lombok.Data;
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import org.springframework.stereotype.Component;
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import java.nio.charset.StandardCharsets;
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import java.sql.Timestamp;
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import java.time.Instant;
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import java.util.Base64;
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import java.util.Date;
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import java.util.UUID;
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@Component
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public class DmsCursorCodec {
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public String encode(Date time, UUID id) {
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String raw = time.toInstant().toString() + "|" + id;
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return Base64.getUrlEncoder().withoutPadding().encodeToString(raw.getBytes(StandardCharsets.UTF_8));
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}
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public Cursor decode(String value) {
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if (value == null || value.trim().isEmpty()) {
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return new Cursor(null, null);
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}
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try {
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String raw = new String(Base64.getUrlDecoder().decode(value), StandardCharsets.UTF_8);
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int separator = raw.indexOf('|');
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if (separator < 1) {
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throw new IllegalArgumentException("missing separator");
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}
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return new Cursor(Timestamp.from(Instant.parse(raw.substring(0, separator))),
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UUID.fromString(raw.substring(separator + 1)));
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} catch (RuntimeException ex) {
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throw DmsPermissionException.of(DmsPermissionError.INVALID_REQUEST, "分页 cursor 无效");
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}
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}
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@Data
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@AllArgsConstructor
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public static class Cursor {
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private Date time;
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private UUID id;
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}
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}
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