Add support for fetching data on the history of a single wikimedia page

lib/wiki-activity.js

@@ -6,8 +6,12 @@ module.exports.fetchWiki = async function fetchWiki(url) {
     // based on https://stackoverflow.com/a/8573941
     return fetchRSS(url + ".atom");
   }
-  // TODO: handle case of a single wiki page
-  // handle case of Main_Page
+  // from there on, this assume we're dealing with a wikimedia instance
+  url = url.replace(/Main_Page$/, '');
+  if (url.match(/\/wiki\/.+$/)) { // a specific page of the wiki
+    const [base, page] = url.split('/wiki/');
+    return fetchRSS(`${base}/wiki/index.php?title=${page}&feed=atom&action=history&days=1000&limit=1000`);
+  }
   return fetchRSS(url + '/api.php?action=feedrecentchanges&days=1000&limit=1000');
 };
 

test/wiki-activity.js

@@ -53,6 +53,19 @@ describe('The Wiki Activity monitor', function () {
     assert.equal(data[0].isoDate, '2023-11-10T13:24:37.000Z', 'RSS feed item wiki date correctly identified');
   });
 
+  it('detects activity on a single wiki page', async function() {
+    const feed = await fs.readFile('test/mock-content/feed.rss', 'utf-8');
+    const u = new URL("https://example.test/wiki/Test_Page");
+    agent
+      .get(u.origin)
+      .intercept({path: `/wiki/index.php?title=Test_Page&feed=atom&action=history&days=1000&limit=1000`, method: "GET"})
+      .reply(200, feed);
+    const { items: data} = await fetchWiki(u.href);
+    assert.equal(data.length, 1, 'RSS Feed from wikimedia has one item');
+    assert.equal(data[0].isoDate, '2023-11-10T13:24:37.000Z', 'RSS feed item wiki date correctly identified');
+  });
+
+
   it("returns an error when the feed doesn't exist", async function() {
     const u = testUrl();
     agent