Implement "isPermaLink" for item:guid

src/__tests__/__snapshots__/rss2.spec.ts.snap

@@ -226,6 +226,40 @@ exports[`rss 2.0 should generate a valid feed with image properties 1`] = `
 </rss>"
 `;
 
+exports[`rss 2.0 should generate a valid feed with non-HTTP GUIDs 1`] = `
+"<?xml version=\\"1.0\\" encoding=\\"utf-8\\"?>
+<rss version=\\"2.0\\" xmlns:atom=\\"http://www.w3.org/2005/Atom\\">
+    <channel>
+        <title>Feed Title</title>
+        <link>http://example.com/</link>
+        <description>This is my personnal feed!</description>
+        <lastBuildDate>Sat, 13 Jul 2013 23:00:00 GMT</lastBuildDate>
+        <docs>https://validator.w3.org/feed/docs/rss2.html</docs>
+        <generator>https://github.com/jpmonette/feed</generator>
+        <language>en</language>
+        <ttl>60</ttl>
+        <image>
+            <title>Feed Title</title>
+            <url>http://example.com/image.png</url>
+            <link>http://example.com/</link>
+        </image>
+        <copyright>All rights reserved 2013, John Doe</copyright>
+        <atom:link href=\\"wss://example.com/\\" rel=\\"hub\\"/>
+        <item>
+            <title><![CDATA[Hello World 2]]></title>
+            <link>https://example.com/hello-world-2</link>
+            <guid>58f618d7a56f2f745291a473
+                <_attr>
+                    <isPermaLink>false</isPermaLink>
+                </_attr>
+            </guid>
+            <pubDate>Wed, 10 Jul 2013 23:00:00 GMT</pubDate>
+            <description><![CDATA[This is another article about Hello World.]]></description>
+        </item>
+    </channel>
+</rss>"
+`;
+
 exports[`rss 2.0 should generate a valid feed with video 1`] = `
 "<?xml version=\\"1.0\\" encoding=\\"utf-8\\"?>
 <rss version=\\"2.0\\" xmlns:dc=\\"http://purl.org/dc/elements/1.1/\\" xmlns:content=\\"http://purl.org/rss/1.0/modules/content/\\" xmlns:atom=\\"http://www.w3.org/2005/Atom\\">

src/__tests__/rss2.spec.ts

@@ -227,4 +227,37 @@ describe("rss 2.0", () => {
     const actual = sampleFeed.rss2();
     expect(actual).toMatchSnapshot();
   });
+  it("should generate a valid feed with non-HTTP GUIDs", () => {
+    const sampleFeed = new Feed({
+      title: "Feed Title",
+      description: "This is my personnal feed!",
+      link: "http://example.com/",
+      id: "http://example.com/",
+      language: "en",
+      ttl: 60,
+      image: "http://example.com/image.png",
+      copyright: "All rights reserved 2013, John Doe",
+      hub: "wss://example.com/",
+      updated, // optional, default = today
+
+      author: {
+        name: "John Doe",
+        email: "[email protected]",
+        link: "https://example.com/johndoe",
+      },
+    })
+
+    sampleFeed.addItem({
+      title: "Hello World 2",
+      id: "https://example.com/hello-world-2",
+      link: "https://example.com/hello-world-2",
+      guid: "58f618d7a56f2f745291a473",
+      guidIsPermaLink: false,
+      description: "This is another article about Hello World.",
+      date: new Date("Sat, 13 Jul 2013 22:00:00 GMT"),
+      published
+    });
+    const actual = sampleFeed.rss2();
+    expect(actual).toMatchSnapshot();
+  })
 });

src/rss2.ts

@@ -128,6 +128,14 @@ export default (ins: Feed) => {
 
     if (entry.guid) {
       item.guid = { _text: entry.guid };
+
+      /**
+       * GUID isPermaLink
+       * https://validator.w3.org/feed/docs/error/InvalidHttpGUID.html
+       */
+      if (entry.guidIsPermaLink !== undefined) {
+        item.guid._attr = { isPermaLink: entry.guidIsPermaLink };
+      }
     } else if (entry.id) {
       item.guid = { _text: entry.id };
     } else if (entry.link) {

src/typings/index.ts

@@ -9,6 +9,7 @@ export interface Item {
   category?: Category[];
 
   guid?: string;
+  guidIsPermaLink?: boolean;
 
   image?: string | Enclosure;
   audio?: string | Enclosure;