refactor: separate Nginx adapter

2 files changed, 65 insertions, 0 deletions

diff --git a/src/lib/nginxAdapter.ts b/src/lib/nginxAdapter.ts
new file mode 100644
index 0000000..fdadd87
--- /dev/null
+++ b/src/lib/nginxAdapter.ts
@@ -0,0 +1,50 @@
+import _ from 'lodash';
+import Bluebird from 'bluebird';
+import axios from 'axios';
+import mem from 'mem';
+import { Adapter } from './types';
+
+const listNginxDirectory = async (path: string): Promise<string[]> => {
+  const basePath = _.trimEnd(path.match('http[s]?://(.*?)/')?.[0], '/');
+  const response = await axios(path);
+  const [_thisDir, ...results] = response.data
+    .match(/href='(.*)'/g)
+    .map((s: string) => s.match(/'(.*)'/)?.[1])
+    .map((s: string) => basePath + s);
+  return results;
+}
+
+const deepListNginxDirectory = async (path: string): Promise<string[]> => {
+  const objects = await listNginxDirectory(path);
+  const fileUrls = objects.filter(url => !url.endsWith('/'));
+  const dirUrls = objects.filter(url => url.endsWith('/'));
+  const deepFileUrls = await Bluebird.map(dirUrls, deepListNginxDirectory);
+  return _.flattenDeep([fileUrls, deepFileUrls]);
+}
+
+const memoizedDeepListNginxDirectory = mem(deepListNginxDirectory, { maxAge: 60000 });
+
+
+// An adapter to fetch markdown & images from Nginx server with enabled directory view
+const nginxAdapter: Adapter = {
+  async getStaticMarkdownPaths(cdn) {
+    const urls = await memoizedDeepListNginxDirectory(cdn);
+    const markdownPaths = _.compact(urls.map(globalPath => globalPath.match(`${cdn}/(.*)\.md`)?.[1]));
+
+    return markdownPaths
+      .map(path => path.split('/'))
+      .map(path => ({ params: { path } }));
+  },
+
+  async getMarkdownSource(cdn, path) {
+    const { data: markdownSource } = await axios(`${cdn}/${path?.join('/')}.md`);
+    return markdownSource;
+  },
+
+  async getEmojiFileNames(cdn) {
+    const urls = await memoizedDeepListNginxDirectory(cdn);
+    return _.compact(urls.map((s: string) => s.match(/emoji\/(.*)/)?.[1]));
+  },
+}
+
+export default nginxAdapter;
diff --git a/src/lib/types.ts b/src/lib/types.ts
new file mode 100644
index 0000000..8bbf5bb
--- /dev/null
+++ b/src/lib/types.ts
@@ -0,0 +1,15 @@
+import { GetStaticPathsResult } from 'next';
+
+/* Collection of methods to fetch data & metadata from CDN */
+export interface Adapter {
+  getStaticMarkdownPaths: (cdn: string) => Promise<GetStaticPathsResult['paths']>;
+  getMarkdownSource: (cdn: string, path: string[]) => Promise<string>;
+  getEmojiFileNames: (cdn: string) => Promise<string[]>;
+}
+
+export interface BenzinConfig {
+  CDN: string;
+  adapter: Adapter;
+}
+
+