Add Util-class CookieFactory

Author: simonwep

src/express/http/CookieFactory.java

@@ -0,0 +1,111 @@
+package express.http;
+
+import java.time.Instant;
+import java.util.HashMap;
+
+public class CookieFactory {
+
+  /**
+   * Parse an cookie string.
+   *
+   * @param cookieString The cookie as string.
+   * @return The parsed cookie as object.
+   */
+  public static Cookie fromString(String cookieString) {
+    Cookie cookie = null;
+    char[] chars = cookieString.toCharArray();
+
+    StringBuilder key = new StringBuilder();
+    StringBuilder val = new StringBuilder();
+    boolean swap = false;
+
+    for (char c : chars) {
+
+      if (c == '=') {
+        swap = true;
+      } else if (c == ';') {
+
+        cookie = addField(cookie, key.toString(), val.toString());
+
+        key.setLength(0);
+        val.setLength(0);
+        swap = false;
+      } else if (swap) {
+        val.append(c);
+      } else {
+        key.append(c);
+      }
+    }
+
+    cookie = addField(cookie, key.toString(), val.toString());
+    return cookie;
+  }
+
+  /**
+   * Parse an list of strings which represents an cookie.
+   *
+   * @param stringCookies The list with string cookies.
+   * @return A list with the parsed cookies.
+   */
+  public static HashMap<String, Cookie> fromStrings(String[] stringCookies) {
+    HashMap<String, Cookie> cookies = new HashMap<>();
+
+    if (stringCookies == null || stringCookies.length == 0)
+      return cookies;
+
+    for (String s : stringCookies) {
+      Cookie cookie = fromString(s);
+      if (cookie != null)
+        cookies.put(cookie.getName(), cookie);
+    }
+
+    return cookies;
+  }
+
+  private static Cookie addField(Cookie cookie, String key, String value) {
+    key = key.trim();
+
+    if (cookie == null) {
+
+      cookie = new Cookie(key, value);
+    } else if (key.equalsIgnoreCase("Path")) {
+
+      cookie.setPath(value);
+    } else if (key.equalsIgnoreCase("Domain")) {
+
+      cookie.setDomain(value);
+    } else if (key.equalsIgnoreCase("Expire")) {
+
+      cookie.setExpire(Instant.parse(value));
+    } else if (key.equalsIgnoreCase("Max-Age")) {
+
+      if (isInteger(value)) {
+        cookie.setMaxAge(Long.parseLong(value));
+      }
+
+    } else if (key.equalsIgnoreCase("SameSite")) {
+
+      SameSite sameSite = value.equalsIgnoreCase("LAX") ? SameSite.LAX : SameSite.STRICT;
+      cookie.setSameSite(sameSite);
+
+    } else if (key.equalsIgnoreCase("Secure")) {
+
+      cookie.setSecure(true);
+    } else if (key.equalsIgnoreCase("HttpOnly")) {
+
+      cookie.setHttpOnly(true);
+    }
+
+
+    return cookie;
+  }
+
+  private static boolean isInteger(String str) {
+    char[] chars = str.toCharArray();
+
+    for (char c : chars)
+      if (c < 48 || c > 57) return false;
+
+    return true;
+  }
+}