Added ShortenUrl

README.md

@@ -21,17 +21,19 @@ This project provides a collection of template renderers.
 
 ## Encoding Renderers
 
-| Renderer                          | Description                                            |
-|:----------------------------------|:-------------------------------------------------------|
-| `rife.render.EncodeBase64`        | Encodes a template value to Base64                     |
-| `rife.render.EncodeHtml`          | Encodes a template value to HTML                       |
-| `rife.render.EncodeHtmlEntities`  | Encodes a template value to HTML decimal entities      |
-| `rife.render.EncodeJs`            | Encodes a template value to JavaScript/ECMAScript      |
-| `rife.render.EncodeJson`          | Encodes a template value to JSON                       |
-| `rife.render.EncodeQp`            | Converts a template value to a quoted-printable string |
-| `rife.render.EncodeUnicode`       | Encodes a template value to Unicode escape codes       |
-| `rife.render.EncodeUrl`           | URL-encodes a template value                           |
-| `rife.render.EncodeXml`           | Encodes a template value to XML                        |
+| Renderer                         | Description                                             |
+|:---------------------------------|:--------------------------------------------------------|
+| `rife.render.EncodeBase64`       | Encodes a template value to Base64                      |
+| `rife.render.EncodeHtml`         | Encodes a template value to HTML                        |
+| `rife.render.EncodeHtmlEntities` | Encodes a template value to HTML decimal entities       |
+| `rife.render.EncodeJs`           | Encodes a template value to JavaScript/ECMAScript       |
+| `rife.render.EncodeJson`         | Encodes a template value to JSON                        |
+| `rife.render.EncodeQp`           | Converts a template value to a quoted-printable string  |
+| `rife.render.EncodeUnicode`      | Encodes a template value to Unicode escape codes        |
+| `rife.render.EncodeUrl`          | URL-encodes a template value                            |
+| `rife.render.EncodeXml`          | Encodes a template value to XML                         |
+| `rife.render.ShorteUrl`          | Shortens a template value using [is.gd](https://is.gd/) |
+
 
 ## Text Renderers
 

lib/src/main/java/rife/render/RenderUtils.java

@@ -20,7 +20,12 @@ package rife.render;
 import rife.template.Template;
 import rife.tools.Convert;
 import rife.tools.Localization;
+import rife.tools.StringUtils;
 
+import java.io.IOException;
+import java.net.HttpURLConnection;
+import java.net.URL;
+import java.nio.charset.StandardCharsets;
 import java.time.ZoneId;
 import java.time.ZonedDateTime;
 import java.time.temporal.ChronoField;
@@ -130,6 +135,39 @@ public final class RenderUtils {
         return output.toString();
     }
 
+    /**
+     * <p>Shortens a URL using <a href="https://is.gd/">is.gid</a>. The URL string must a valid http or https URL.</p>
+     *
+     * <p>Based on <a href="https://github.com/ethauvin/isgd-shorten">isgd-shorten</a></p>
+     *
+     * @param url the source URL
+     * @return the short URL
+     */
+    public static String shortenUrl(String url) {
+        if (url == null || url.isBlank() || !url.matches("^[Hh][Tt][Tt][Pp][Ss]?:\\/\\/\\w.*")) {
+            return url;
+        }
+
+        var shorten = url;
+        try {
+            var connection = (HttpURLConnection) new URL(
+                    String.format("https://is.gd/create.php?format=simple&url=%s", StringUtils.decodeUrl(url.trim())))
+                    .openConnection();
+            connection.setRequestProperty(
+                    "User-Agent", "Mozilla/5.0 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/111.0"
+            );
+            var responseCode = connection.getResponseCode();
+            if (responseCode >= 200 && responseCode <= 399) {
+                try (var inputStream = connection.getInputStream()) {
+                    shorten = new String(inputStream.readAllBytes(), StandardCharsets.UTF_8);
+                }
+            }
+        } catch (IOException ignore) {
+            // do nothing
+        }
+        return shorten;
+    }
+
     /**
      * Swaps the case of a String.
      *
@@ -137,7 +175,7 @@ public final class RenderUtils {
      * @return the modified String or null
      */
     @SuppressWarnings("PMD.AvoidReassigningLoopVariables")
-    public static String swapCase(final String src) {
+    public static String swapCase(String src) {
         if (src == null || src.isBlank()) {
             return src;
         }

lib/src/main/java/rife/render/ShortenUrl.java

@@ -0,0 +1,47 @@
+/*
+ *  Copyright 2023 the original author or authors.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *   you may not use this file except in compliance with the License.
+ *   You may obtain a copy of the License at
+ *
+ *       https://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *
+ */
+
+package rife.render;
+
+import rife.template.Template;
+import rife.template.ValueRenderer;
+import rife.tools.StringUtils;
+
+/**
+ * <p>Shortens a template value using <a href="https://is.gd/">is.gid</a>. The value must a valid http or https URL.</p>
+ *
+ * <p>Based on <a href="https://github.com/ethauvin/isgd-shorten">isgd-shorten</a></p>
+ *
+ * <p>Usage:</p>
+ *
+ * <pre>
+ *   &lt;!--v render:rife.render.ShortenUrl:valueId/--&gt;
+ *   {{v render:rife.render.ShortenUrl:valueId/}}
+ * </pre>
+ *
+ * @author <a href="https://erik.thauvin.net/">Erik C. Thauvin</a>
+= * @since 1.0
+ */
+public class ShortenUrl implements ValueRenderer {
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public String render(Template template, String valueId, String differentiator) {
+        return RenderUtils.shortenUrl(RenderUtils.fetchValue(template, differentiator));
+    }
+}

lib/src/test/java/rife/render/TestEncode.java

@@ -100,4 +100,16 @@ class TestEncode {
         t.setAttribute(TestCase.FOO, "a test &");
         assertThat(t.getContent()).isEqualTo("<test>\n    <foo>a test &amp;</foo>\n</test>");
     }
+
+    @Test
+    void testShortenUrl() {
+        var t = TemplateFactory.HTML.get("shortenUrl");
+        var url = "https://example.com/";
+        var shortUrl = "https://is.gd/AG3Hwv";
+        t.setValue(TestCase.FOO, url);
+        assertThat(t.getContent()).isEqualTo(String.format("<a href=\"%s\">%s</a>", shortUrl, url));
+        t.setValue(TestCase.FOO, TestCase.FOO);
+        assertThat(t.getContent()).isEqualTo("<a href=\"foo\">foo</a>");
+
+    }
 }

lib/src/test/resources/templates/shortenUrl.html

@@ -0,0 +1 @@
+<a href="{{v render:rife.render.ShortenUrl:foo/}}"><!--v foo/--></a>