package jnpf.file;
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import com.fasterxml.jackson.databind.JsonNode;
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import com.fasterxml.jackson.databind.ObjectMapper;
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import jnpf.base.ActionResultCode;
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import jnpf.exception.DataException;
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import jnpf.model.filecontent.FileContentComparisonForm;
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import java.util.HashSet;
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import java.util.Set;
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/** Compare canonical, authorized attachments. Never treats a client-supplied checksum as evidence. */
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public final class FileContentEquality {
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private static final ObjectMapper JSON = new ObjectMapper();
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private FileContentEquality() {}
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public static boolean same(String original, Object candidate, FileContentApi api) {
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JsonNode before = files(original), after = files(candidate);
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if (before == null || after == null || before.size() != after.size()) return false;
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boolean identical = true;
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for (int i = 0; i < before.size(); i++) {
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if (!before.get(i).path("fileId").equals(after.get(i).path("fileId"))
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|| !before.get(i).path("url").equals(after.get(i).path("url"))) identical = false;
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}
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if (identical) return true; // Same immutable server object; display metadata is not content.
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if (api == null) throw new DataException("文件内容校验服务不可用，请稍后重试");
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FileContentComparisonForm form = new FileContentComparisonForm();
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form.setOriginal(before.toString()); form.setCandidate(after.toString());
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var result = api.sameContent("jnpf-dms", form);
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if (result == null || !ActionResultCode.SUCCESS.getCode().equals(result.getCode()) || result.getData() == null)
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throw new DataException("文件内容校验失败，请稍后重试");
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return result.getData();
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}
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private static JsonNode files(Object value) {
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try {
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JsonNode files = value instanceof String text ? JSON.readTree(text) : JSON.valueToTree(value);
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if (files == null || !files.isArray() || files.isEmpty() || files.size() > 100) return null;
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Set<String> ids = new HashSet<>();
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for (JsonNode file : files) {
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String id = file.path("fileId").asText("");
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if (id.isBlank() || file.path("url").asText("").isBlank() || !ids.add(id)) return null;
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}
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return files;
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} catch (Exception invalid) { return null; }
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}
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}
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