262 lines
9.5 KiB
PHP
262 lines
9.5 KiB
PHP
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<?php
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namespace app\common\logic;
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/**
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* Fingerprint
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*
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* 目标：
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* - 默认“强制所有字段参与计算”，保证相同记录生成同一指纹
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* - 通过统一规范化策略，避免无意义差异（空白、大小写、JSON键序）导致指纹抖动
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* - 仅排除技术字段：id、fingerprint（可通过参数自行增删）
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*
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* 用法：
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* $hash = Fingerprint::makeFromArray($payload); // 创建前
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* $hash = Fingerprint::makeFromModel($skuModel); // 已有模型
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* $hash = Fingerprint::makeFromArray($payload, ['exclude'=>['msrp']]); // 可选排除
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*/
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class Fingerprint
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{
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/** 你的 veh_vehicle_sku 所有列（保持与表结构一致，顺序无关但建议完整） */
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public const COLS = [
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'id','sku_code','fingerprint',
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'brand_code','brand_name','series_code','series_name',
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'model_code','model_name','model_year',
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'trim_code','trim_level_code','edition_code',
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'trim','trim_level','edition_name',
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'body_type_code','drive_type_code','motor_layout_code','fuel_type_code',
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'engine_disp_l','engine_turbo','engine_power_kw','battery_kwh',
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'transmission_code','gears','range_km','range_std_code',
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'doors','seats','weight_kg','dimensions_mm',
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'color_exterior_code','color_exterior_text',
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'color_interior_code','color_interior_text',
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'options_official','features','emission_std_code',
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'origin_country','currency','msrp',
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'is_active','corp_id','remark',
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'created_by','updated_by','created_at','updated_at',
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];
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/** 默认剔除：技术/循环依赖字段 */
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public const EXCLUDE_DEFAULT = [
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'id','sku_code','fingerprint', 'dimensions_mm', 'options_official', 'features',
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'origin_country','currency','msrp',
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'is_active','corp_id','remark',
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'created_by','updated_by','created_at','updated_at'
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];
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/** 识别为“code类”的字段模式（统一大写） */
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private const CODE_FIELD_REGEX = '/(_code|_country|^currency)$/i';
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/** 识别为 JSON 字段 */
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private const JSON_FIELDS = ['dimensions_mm','options_official','features'];
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/**
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* 从 Eloquent 模型生成
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*/
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public static function makeFromModel($model, array $opts = []): string
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{
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return self::makeFromArray($model->toArray(), $opts);
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}
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/**
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* 从数组生成指纹
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* @param array $row 一般为 $_POST 合并后的业务数据或 $model->toArray()
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* @param array $opts ['exclude'=>[], 'extra'=>[], 'salt'=>string]
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* - exclude: 额外排除的字段（默认仅排除 id,fingerprint）
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* - extra : 额外拼入的键值（例如上下文、租户策略），会参与计算
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* - salt : 额外加盐字符串
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*/
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public static function makeFromArray(array $row, array $opts = []): string
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{
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$exclude = array_values(array_unique(array_merge(self::EXCLUDE_DEFAULT, $opts['exclude'] ?? [])));
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$extra = $opts['extra'] ?? [];
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$salt = $opts['salt'] ?? '';
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// 1) 统一抽取“表中定义的字段” + extra，缺失字段也要纳入（值按 NULL 处理）
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$data = [];
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foreach (self::COLS as $col) {
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if (in_array($col, $exclude, true)) continue;
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$data[$col] = array_key_exists($col, $row) ? $row[$col] : null;
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}
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// extra 也参与
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foreach ($extra as $k => $v) {
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if (!is_string($k) || $k === '') continue;
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$data['__extra__'.$k] = $v;
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}
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// 2) 规范化（按字段特征）
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$canon = [];
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foreach ($data as $k => $v) {
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$canon[$k] = self::normalize($k, $v);
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}
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// 3) 键名排序，确保顺序无关
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ksort($canon, SORT_STRING);
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// 4) 拼成稳定串： key=value ｜ key=value...
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$parts = [];
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foreach ($canon as $k => $v) {
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// 为空也必须占位，避免 key 消失影响其他键的意义
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$parts[] = $k.'='.$v;
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}
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if ($salt !== '') {
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$parts[] = '__salt__='.$salt;
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}
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$plain = implode('|', $parts);
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// 5) sha256
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return hash('sha256', $plain);
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}
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/**
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* 规范化单个字段
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* - NULL -> 特殊占位 "∅"（避免与空串混淆）
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* - 布尔/整数/浮点 -> 统一数字字符串
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* - code类字段 -> 去首尾空白 & 转大写
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* - 普通字符串 -> trim & 压缩连续空白为单空格
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* - JSON字段 -> 解析后做“键排序 + 值规范化 + 索引数组可排序”，再无空白编码
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*/
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private static function normalize(string $field, $value): string
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{
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if ($value === null) return '∅';
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// 数值类型
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if (is_int($value)) return (string)$value;
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if (is_bool($value)) return $value ? '1' : '0';
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if (is_float($value) || (is_string($value) && is_numeric($value) && self::looksLikeNumberField($field))) {
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// 统一浮点格式，最多 6 位小数并去尾零
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$num = (float)$value;
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$s = number_format($num, 6, '.', '');
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$s = rtrim(rtrim($s, '0'), '.');
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return $s === '' ? '0' : $s;
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}
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// JSON 字段
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if (in_array($field, self::JSON_FIELDS, true)) {
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return self::normalizeJson($value);
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}
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// 字符串
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if (is_string($value)) {
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$s = trim($value);
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// code类：统一大写
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if (preg_match(self::CODE_FIELD_REGEX, $field)) {
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$s = mb_strtoupper($s, 'UTF-8');
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} else {
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// 普通文本：压缩连续空白
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$s = preg_replace('/\s+/u', ' ', $s);
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}
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return $s === '' ? '' : $s;
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}
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// 数组（极少出现，按 JSON 处理）
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if (is_array($value)) {
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return self::normalizeJson($value);
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}
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// 其他类型（对象等）：转 JSON 后处理
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return self::normalizeJson($value);
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}
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/** 判断这个字段是否“看起来像数值字段” */
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private static function looksLikeNumberField(string $field): bool
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{
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static $numKeys = [
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'engine_disp_l','engine_power_kw','battery_kwh','gears',
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'range_km','doors','seats','weight_kg','msrp','model_year',
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'created_at','updated_at','corp_id','is_active'
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];
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return in_array($field, $numKeys, true);
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}
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/**
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* JSON 规范化：
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* - 字符串：若能 json_decode 则按 JSON；否则当普通字符串再规范化
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* - 对象：键名排序；值递归规范化
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* - 索引数组：元素递归规范化后，按字符串值排序（视为集合，避免顺序抖动）
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* - 最终 json_encode(JSON_UNESCAPED_UNICODE|UNESCAPED_SLASHES)
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*/
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private static function normalizeJson($val): string
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{
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// 已是数组/对象
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if (is_array($val)) {
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$normalized = self::canonArray($val);
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return json_encode($normalized, JSON_UNESCAPED_UNICODE|JSON_UNESCAPED_SLASHES);
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}
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// 字符串尝试解析
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if (is_string($val)) {
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$val = trim($val);
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if ($val === '') return '""';
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$decoded = json_decode($val, true);
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if (json_last_error() === JSON_ERROR_NONE) {
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$normalized = self::canonArray($decoded);
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return json_encode($normalized, JSON_UNESCAPED_UNICODE|JSON_UNESCAPED_SLASHES);
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}
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// 非 JSON 字符串，按普通字符串规范化
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$s = preg_replace('/\s+/u', ' ', $val);
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return json_encode($s, JSON_UNESCAPED_UNICODE|JSON_UNESCAPED_SLASHES);
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}
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// 其他类型：直接编码
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return json_encode($val, JSON_UNESCAPED_UNICODE|JSON_UNESCAPED_SLASHES);
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}
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/** 递归规范化数组/对象 */
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private static function canonArray($arr)
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{
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if (!is_array($arr)) return $arr;
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// 关联数组（对象）
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if (self::isAssoc($arr)) {
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$out = [];
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ksort($arr, SORT_STRING);
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foreach ($arr as $k => $v) {
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$out[(string)$k] = self::canonValue($v);
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}
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return $out;
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}
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// 索引数组（当集合处理：元素字符串化后排序）
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$tmp = [];
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foreach ($arr as $v) {
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$tmp[] = self::canonValue($v);
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}
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// 将元素转为字符串再排序，确保稳定
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usort($tmp, function($a, $b) {
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$sa = is_scalar($a) ? (string)$a : json_encode($a, JSON_UNESCAPED_UNICODE|JSON_UNESCAPED_SLASHES);
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$sb = is_scalar($b) ? (string)$b : json_encode($b, JSON_UNESCAPED_UNICODE|JSON_UNESCAPED_SLASHES);
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return strcmp($sa, $sb);
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});
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return $tmp;
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}
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private static function canonValue($v)
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{
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if (is_array($v)) return self::canonArray($v);
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if (is_bool($v)) return $v ? 1 : 0;
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if (is_int($v)) return $v;
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if (is_float($v)) {
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$s = number_format($v, 6, '.', '');
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$s = rtrim(rtrim($s, '0'), '.');
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return $s === '' ? '0' : $s;
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}
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if (is_string($v)) {
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$s = trim($v);
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$s = preg_replace('/\s+/u', ' ', $s);
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return $s;
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}
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return $v;
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}
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private static function isAssoc(array $arr): bool
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{
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// 有任意一个键不是 0..n 的递增整数，就视为关联数组
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$i = 0;
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foreach ($arr as $k => $_) {
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if ($k !== $i++) return true;
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}
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return false;
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}
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}
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