feat: Create feed handler for root

8 files changed, 103 insertions, 31 deletions

diff --git a/config/default.toml b/config/default.toml
index b52674c..5dceae1 100644
--- a/config/default.toml
+++ b/config/default.toml
@@ -3,6 +3,7 @@ port = 3000
 
 [site]
 description = "Nobody in particular"
+baseURL = "http://localhost:3000/"
 
 [[site.nav]]
 text = "Home"
@@ -20,6 +21,10 @@ text = "johndoe@johndoe.org"
 url = "https://twitter.com/johndoe"
 text = "Twitter"
 
+[feed]
+originalDomainName = "johndoe.com"
+domainStartDate = "2016-01-01"
+
 [posts]
 folder = "./posts"
 
diff --git a/package.json b/package.json
index 20d7918..4d1ebe6 100644
--- a/package.json
+++ b/package.json
@@ -50,7 +50,7 @@
     "gray-matter": "^2.1.1",
     "highland": "^2.11.0",
     "highlight.js": "^9.12.0",
-    "hyperfast": "^2.1.0",
+    "hyperfast": "^2.2.0",
     "indent-string": "^3.1.0",
     "koa": "^2.2.0",
     "koa-helmet": "^3.2.0",
diff --git a/src/app.js b/src/app.js
index 912dda2..a323b9c 100644
--- a/src/app.js
+++ b/src/app.js
@@ -13,6 +13,13 @@ const config = require("./modules/config.js");
 const Router = require("koa-router");
 const router = new Router();
 
+const makeTagURI = (authority, startDate) => specific =>
+  `tag:${authority},${startDate}:${specific}`;
+
+app.context.makeTagURI = makeTagURI(
+  config.feed.originalDomainName,
+  config.feed.domainStartDate
+);
 app.context.getURL = router.url.bind(router);
 
 module.exports = async function() {
@@ -35,6 +42,12 @@ module.exports = async function() {
   );
 
   router.get(
+    "feed",
+    "/index.xml",
+    actions.posts(config, responders.feed, Posts.posts)
+  );
+
+  router.get(
     "post",
     "/post/:filename",
     actions.post(config, responders.post, Posts.posts)
diff --git a/src/domain/posts.js b/src/domain/posts.js
index 98488ba..ab35518 100644
--- a/src/domain/posts.js
+++ b/src/domain/posts.js
@@ -86,7 +86,9 @@ function taxonomise(taxonomies, posts) {
 module.exports = async function(config, getURL) {
   const posts = await getFolder(config.folder, getURL);
   const taxonomies = taxonomise(config.taxonomies, posts);
+  const lastPostDate = Math.max(Array.from(posts.values(), p => p.date));
   return {
+    lastPostDate,
     posts,
     taxonomies,
     get
diff --git a/src/responders.js b/src/responders.js
index 8f084a3..f4ea0a6 100644
--- a/src/responders.js
+++ b/src/responders.js
@@ -1,6 +1,7 @@
 "use strict";
 
 const fs = require("fs");
+const URL = require("url").URL;
 const Case = require("case");
 const hyperfast = require("hyperfast");
 const indent = require("indent-string");
@@ -25,7 +26,7 @@ const findPostContent = /^(\s+)<div class="e-content/m;
 const postIndentLevel =
   baseIndentLevel + getTemplateIndent(findPostContent, "post.html");
 
-function indentForTemplate(text, indentLevel) {
+function indentForTemplate(text, indentLevel = 0) {
   return indent(text, indentLevel).slice(indentLevel).replace(/\n+$/, "");
 }
 
@@ -37,7 +38,8 @@ const templates = {
   layout: templateReader("layout.html"),
   home: templateReader("home.html", baseIndentLevel),
   post: templateReader("post.html", baseIndentLevel),
-  list: templateReader("list.html", baseIndentLevel)
+  list: templateReader("list.html", baseIndentLevel),
+  feed: templateReader("feed.xml")
 };
 
 function title(siteTitle, pageTitle) {
@@ -62,6 +64,22 @@ const renderPost = ctx => post => {
   };
 };
 
+const renderPostAtom = (ctx, config) => post => {
+  return {
+    id: ctx.makeTagURI(`post:${post.basename}`),
+    title: post.data.get("title"),
+    updated: post.data.get("date"),
+    summary: post.data.get("summary"),
+    "link[rel=alternate]": {
+      href: new URL(ctx.getURL("post", post.basename), config.site.baseURL)
+    },
+    "content > div": {
+      _html: post.body
+    },
+    "author > name": config.author.name
+  };
+};
+
 function layout(config, pageTitle, pageElement) {
   return hyperfast(templates.layout, {
     title: title(config.author.name, pageTitle),
@@ -125,5 +143,25 @@ module.exports = {
       post.data.get("title"),
       hyperfast(templates.post, renderPost(ctx)(post))
     );
+  },
+
+  feed(ctx, config, { posts, lastPostDate }) {
+    ctx.type = "atom";
+
+    ctx.body = hyperfast(
+      templates.feed,
+      {
+        "feed > title": config.author.name,
+        "feed > link": {
+          href: config.site.baseURL
+        },
+        "feed > id": {
+          _text: ctx.makeTagURI("feed")
+        },
+        "feed > updated": lastPostDate,
+        "feed > entry": posts.map(renderPostAtom(ctx, config))
+      },
+      { xmlMode: true }
+    ).outerHTML;
   }
 };
diff --git a/src/templates/feed.xml b/src/templates/feed.xml
new file mode 100644
index 0000000..03d68d7
--- /dev/null
+++ b/src/templates/feed.xml
@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="utf-8"?>
+<feed xmlns="http://www.w3.org/2005/Atom">
+  <title>Example Feed</title>
+  <link href="http://example.org/"/>
+  <id>urn:uuid:60a76c80-d399-11d9-b91C-0003939e0af6</id>
+  <updated>2003-12-13T18:30:02Z</updated>
+
+  <entry>
+    <title>Atom-Powered Robots Run Amok</title>
+    <link rel="alternate" type="text/html" href="http://example.org/2003/12/13/atom03.html"/>
+    <id>urn:uuid:1225c695-cfb8-4ebb-aaaa-80da344efa6a</id>
+    <updated>2003-12-13T18:30:02Z</updated>
+    <summary>Some text.</summary>
+    <content type="xhtml">
+      <div xmlns="http://www.w3.org/1999/xhtml">
+        <p>This is the entry content.</p>
+      </div>
+    </content>
+    <author>
+      <name>John Doe</name> 
+    </author>
+  </entry>
+
+</feed>
diff --git a/test/app.test.js b/test/app.test.js
index f0ab3da..33c8905 100644
--- a/test/app.test.js
+++ b/test/app.test.js
@@ -169,5 +169,18 @@ test("highlight css", async function(t) {
   t.regex(res.text, /^\.hljs/m);
 });
 
+test("feed", async function(t) {
+  const res = await request(app.listen()).get("/index.xml");
+
+  t.is(res.statusCode, 200);
+  t.is(res.type, "application/atom+xml");
+  t.regex(res.text, /^<\?xml/);
+
+  const $ = parseResponse(res);
+
+  t.is($("feed > title").text(), "John Doe");
+  t.is($("feed > link").attr("href"), "http://localhost:3000/");
+});
+
 test(notFound, "/post/non-existent", /Post not found/);
 test(notFound, "/tag/non-existent", /tag non-existent not found/);
diff --git a/yarn.lock b/yarn.lock
index 9d2e7de..fc6330a 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -743,10 +743,6 @@ buf-compare@^1.0.0:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/buf-compare/-/buf-compare-1.0.1.tgz#fef28da8b8113a0a0db4430b0b6467b69730b34a"
 
-buffer-shims@^1.0.0:
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/buffer-shims/-/buffer-shims-1.0.0.tgz#9978ce317388c649ad8793028c3477ef044a8b51"
-
 builtin-modules@^1.0.0, builtin-modules@^1.1.1:
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/builtin-modules/-/builtin-modules-1.1.1.tgz#270f076c5a72c02f5b65a47df94c5fe3a278892f"
@@ -1471,20 +1467,13 @@ domutils@1.4:
   dependencies:
     domelementtype "1"
 
-domutils@1.5, domutils@1.5.1:
+domutils@1.5, domutils@1.5.1, domutils@^1.5.0, domutils@^1.5.1:
   version "1.5.1"
   resolved "https://registry.yarnpkg.com/domutils/-/domutils-1.5.1.tgz#dcd8488a26f563d61079e48c9f7b7e32373682cf"
   dependencies:
     dom-serializer "0"
     domelementtype "1"
 
-domutils@^1.5.0, domutils@^1.5.1:
-  version "1.6.2"
-  resolved "https://registry.yarnpkg.com/domutils/-/domutils-1.6.2.tgz#1958cc0b4c9426e9ed367fb1c8e854891b0fa3ff"
-  dependencies:
-    dom-serializer "0"
-    domelementtype "1"
-
 dont-sniff-mimetype@1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/dont-sniff-mimetype/-/dont-sniff-mimetype-1.0.0.tgz#5932890dc9f4e2f19e5eb02a20026e5e5efc8f58"
@@ -2581,9 +2570,9 @@ husky@^0.13.4:
     is-ci "^1.0.9"
     normalize-path "^1.0.0"
 
-hyperfast@^2.1.0:
-  version "2.1.0"
-  resolved "https://registry.yarnpkg.com/hyperfast/-/hyperfast-2.1.0.tgz#72c91f87126c54e6fe0ad2264ece278b3a6c0a56"
+hyperfast@^2.2.0:
+  version "2.2.0"
+  resolved "https://registry.yarnpkg.com/hyperfast/-/hyperfast-2.2.0.tgz#27d9f1e8a81f02332b6af5dd96281e20d91a7f58"
   dependencies:
     css-select "^1.1.0"
     domutils "^1.5.0"
@@ -4320,7 +4309,7 @@ readable-stream@1.1:
     isarray "0.0.1"
     string_decoder "~0.10.x"
 
-readable-stream@^2.0.0, readable-stream@^2.0.5, readable-stream@^2.0.6, readable-stream@^2.1.4, readable-stream@^2.1.5, readable-stream@^2.2.2:
+readable-stream@^2.0.0, readable-stream@^2.0.2, readable-stream@^2.0.5, readable-stream@^2.0.6, readable-stream@^2.1.4, readable-stream@^2.1.5, readable-stream@^2.2.2:
   version "2.2.11"
   resolved "https://registry.yarnpkg.com/readable-stream/-/readable-stream-2.2.11.tgz#0796b31f8d7688007ff0b93a8088d34aa17c0f72"
   dependencies:
@@ -4332,18 +4321,6 @@ readable-stream@^2.0.0, readable-stream@^2.0.5, readable-stream@^2.0.6, readable
     string_decoder "~1.0.0"
     util-deprecate "~1.0.1"
 
-readable-stream@^2.0.2:
-  version "2.1.5"
-  resolved "https://registry.yarnpkg.com/readable-stream/-/readable-stream-2.1.5.tgz#66fa8b720e1438b364681f2ad1a63c618448c9d0"
-  dependencies:
-    buffer-shims "^1.0.0"
-    core-util-is "~1.0.0"
-    inherits "~2.0.1"
-    isarray "~1.0.0"
-    process-nextick-args "~1.0.6"
-    string_decoder "~0.10.x"
-    util-deprecate "~1.0.1"
-
 readable-stream@~2.0.5:
   version "2.0.6"
   resolved "https://registry.yarnpkg.com/readable-stream/-/readable-stream-2.0.6.tgz#8f90341e68a53ccc928788dacfcd11b36eb9b78e"