Added: Add UrlUtils

termux-shared/src/main/java/com/termux/shared/net/UrlUtils.java

@@ -0,0 +1,113 @@
+package com.termux.shared.net;
+
+import androidx.annotation.Nullable;
+
+import com.termux.shared.data.DataUtils;
+import com.termux.shared.logger.Logger;
+
+import java.net.MalformedURLException;
+import java.net.URL;
+
+public class UrlUtils {
+
+    /** The parts of a {@link URL}. */
+    public enum UrlPart {
+        AUTHORITY,
+        FILE,
+        HOST,
+        REF,
+        FRAGMENT,
+        PATH,
+        PORT,
+        PROTOCOL,
+        QUERY,
+        USER_INFO
+    }
+
+    private static final String LOG_TAG = "UrlUtils";
+
+    /**
+     * Join a url base and destination.
+     *
+     * @param base The base url to open.
+     * @param destination The destination url to open.
+     * @param logError If an error message should be logged.
+     * @return Returns the joined {@link String} Url, otherwise {@code null}.
+     */
+    @Nullable
+    public static String joinUrl(final String base, String destination, boolean logError) {
+        if (DataUtils.isNullOrEmpty(base)) return null;
+        try {
+            return new URL(new URL(base), destination).toString();
+        } catch (MalformedURLException e) {
+            if (logError)
+                Logger.logError(LOG_TAG, "Failed to join url base \"" + base + "\" and destination \"" + destination + "\": " + e.getMessage());
+            return null;
+        }
+    }
+
+    /**
+     * Get {@link URL} from url string.
+     *
+     * @param urlString The urlString string.
+     * @return Returns the {@link URL} if a valid urlString, otherwise {@code null}.
+     */
+    @Nullable
+    public static URL getUrl(String urlString) {
+        if (DataUtils.isNullOrEmpty(urlString)) return null;
+        try {
+            return new URL(urlString);
+        } catch (MalformedURLException e) {
+            return null;
+        }
+    }
+
+    /**
+     * Get a {@link URL} part from url string.
+     *
+     * @param urlString The urlString string.
+     * @param urlPart The part to get.
+     * @return Returns the {@link URL} part if a valid urlString and part, otherwise {@code null}.
+     */
+    @Nullable
+    public static String getUrlPart(String urlString, UrlPart urlPart) {
+        URL url = getUrl(urlString);
+        if (url == null) return null;
+        switch (urlPart) {
+            case AUTHORITY:
+                return url.getAuthority();
+            case FILE:
+                return url.getFile();
+            case HOST:
+                return url.getHost();
+            case REF:
+            case FRAGMENT:
+                return url.getRef();
+            case PATH:
+                return url.getPath();
+            case PORT:
+                return String.valueOf(url.getPort());
+            case PROTOCOL:
+                return url.getProtocol();
+            case QUERY:
+                return url.getQuery();
+            case USER_INFO:
+                return url.getUserInfo();
+            default:
+                return null;
+        }
+    }
+
+    /** Remove "https://www.", "https://", "www.", etc */
+    public static String removeProtocol(String urlString) {
+        if (urlString == null) return null;
+        return urlString.replaceFirst("^(http[s]?://www\\.|http[s]?://|www\\.)","");
+    }
+
+    public static boolean areUrlsEqual(String url1, String url2) {
+        if (url1 == null && url2 == null) return true;
+        if (url1 == null || url2 == null) return false;
+        return UrlUtils.removeProtocol(url1).replaceAll("/+$", "").equals(UrlUtils.removeProtocol(url2).replaceAll("/+$", ""));
+    }
+
+}