fix: support 123pan redirected share links

2026-08-27 12:02:01 +00:00 · 2026-07-06 08:49:29 +08:00
parent 275f6b9e6d
commit 24bf98bca9
5 changed files with 498 additions and 418 deletions
@@ -0,0 +1,84 @@
+package cn.qaiu.util;
+
+import org.apache.commons.lang3.StringUtils;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * 123分享链接子域工具：将分享 key 的前半段解码为数字 uid。
+ */
+public final class YeShareHostUtil {
+
+    private static final String CODE62 = "Tvd3hHA9QEkom14xpfaBJIMwgFYGPXn2sWCNORDr80KuUSl7bZcetizL5q6yVj";
+    private static final long MAX_SAFE_INTEGER = 9007199254740991L;
+    private static final Map<Character, Integer> DECODE_MAP = new HashMap<>();
+
+    static {
+        for (int i = 0; i < CODE62.length(); i++) {
+            DECODE_MAP.put(CODE62.charAt(i), i);
+        }
+    }
+
+    private YeShareHostUtil() {
+    }
+
+    public static String getNumericSubdomainIdByShareKey(String shareKey) {
+        String normalized = normalizeShareKey(shareKey);
+        if (StringUtils.isBlank(normalized)) {
+            return "";
+        }
+        int split = normalized.indexOf('-');
+        if (split <= 0) {
+            return "";
+        }
+        String encodedUid = normalized.substring(0, split);
+        Long uid = decodeBase62LittleEndian(encodedUid);
+        return uid == null ? "" : String.valueOf(uid);
+    }
+
+    public static String normalizeShareKey(String shareKey) {
+        if (StringUtils.isBlank(shareKey)) {
+            return "";
+        }
+        String key = shareKey.trim();
+        int queryIndex = key.indexOf('?');
+        if (queryIndex >= 0) {
+            key = key.substring(0, queryIndex);
+        }
+        int slashIndex = key.lastIndexOf('/');
+        if (slashIndex >= 0 && slashIndex < key.length() - 1) {
+            key = key.substring(slashIndex + 1);
+        }
+        if (key.endsWith(".html")) {
+            key = key.substring(0, key.length() - 5);
+        }
+        return key;
+    }
+
+    private static Long decodeBase62LittleEndian(String value) {
+        if (StringUtils.isBlank(value)) {
+            return null;
+        }
+        long result = 0L;
+        for (int i = 0; i < value.length(); i++) {
+            Integer digit = DECODE_MAP.get(value.charAt(i));
+            if (digit == null) {
+                return null;
+            }
+            double weighted = digit * Math.pow(62, i);
+            if (!Double.isFinite(weighted)) {
+                return null;
+            }
+            long next = result + (long) weighted;
+            if (next <= 0 || next > MAX_SAFE_INTEGER) {
+                return null;
+            }
+            result = next;
+        }
+        if (result <= 0) {
+            return null;
+        }
+        return result;
+    }
+}