From 5593878c66b6d5af7615dda7ddd9ee6ba3adf3c9 Mon Sep 17 00:00:00 2001
From: Julien Oculi <xdrz.jot.sr@gmail.com>
Date: Tue, 2 Jul 2024 11:20:38 +0200
Subject: [PATCH] feat(backend): :sparkles: implement news fetching from
 git.cohabit

---
 .vscode/settings.json |   4 +-
 src/blog/mod.ts       | 104 ++++++++++++++++++++++++++++++++++++++++++
 src/blog/types.ts     |  12 +++++
 3 files changed, 119 insertions(+), 1 deletion(-)
 create mode 100644 src/blog/mod.ts
 create mode 100644 src/blog/types.ts

diff --git a/.vscode/settings.json b/.vscode/settings.json
index 8f31af9..7d3d80b 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -37,7 +37,9 @@
 		"ux",
 		"route",
 		"frontend",
-		"components"
+		"components",
+		"island",
+		"backend"
 	],
 	"[ignore]": {
 		"editor.defaultFormatter": "foxundermoon.shell-format"
diff --git a/src/blog/mod.ts b/src/blog/mod.ts
new file mode 100644
index 0000000..779105e
--- /dev/null
+++ b/src/blog/mod.ts
@@ -0,0 +1,104 @@
+import { BlogProps } from ':components/BlogCard.tsx'
+import { NewsFrontMatter } from ':src/blog/types.ts'
+import { base64ToString } from ':src/utils.ts'
+import { extract } from '@std/front-matter/yaml'
+
+export async function fetchNews(
+    publisher: string,
+    name: string,
+): Promise<BlogProps> {
+    const apiUrl = 'https://git.cohabit.fr/api/v1/'
+    const baseEndpoint = new URL(`repos/${publisher}/.news/`, apiUrl)
+    const endpoint = new URL('contents/', baseEndpoint)
+
+    // Get readme content api url
+    const readmePath = encodeURIComponent(`${name}/README.md`)
+    const contentUrl = new URL(readmePath, endpoint)
+
+    // Fetch readme content, commit hash and raw url for relative links
+    const file = await getCommitAndContent(contentUrl)
+    // Get commit infos (author + date) and get readme content from base64 source
+    const { raw, url, lastUpdate, author } = await getAuthorAndParseContent(
+        file,
+        baseEndpoint,
+    )
+    // Extract frontmatter
+    const { attrs, body } = extract<NewsFrontMatter>(raw)
+
+    // Transform API responses into BlogProps for BlogCard and BlogPost components
+    return {
+        author,
+        publisher,
+        lastUpdate,
+        options: attrs['x-cohabit'],
+        title: attrs.title,
+        hash: file.sha,
+        description: attrs.description,
+        body,
+        name,
+        url,
+        tags: attrs.tags,
+    }
+}
+
+export async function* fetchNewsList(
+    publisher: string,
+): AsyncGenerator<BlogProps, void, void> {
+    const apiUrl = 'https://git.cohabit.fr/api/v1/'
+    const baseEndpoint = new URL(`repos/${publisher}/.news/`, apiUrl)
+    const endpoint = new URL('contents/', baseEndpoint)
+
+    // Fetch repo content
+    const root = await fetch(endpoint).then((response) => response.json()) as {
+        name: string
+        type: string
+    }[]
+
+    // Fetch `README.md` in sub directories
+    const blogPropsList = root
+        // Remove file and dir starting with "."
+        .filter(isNewsDirectory)
+        // Fetch single news and return BlogProps
+        .map(({ name }) => fetchNews(publisher, name))
+
+    // Yield each news
+    for (const blogProps of blogPropsList) {
+        yield blogProps
+    }
+}
+
+async function getAuthorAndParseContent(
+    file: { download_url: string; content: string; last_commit_sha: string },
+    baseEndpoint: URL,
+) {
+    const commitUrl = new URL(
+        `git/commits/${file.last_commit_sha}?stat=false&verification=false&files=false`,
+        baseEndpoint,
+    )
+    const infos = await fetch(commitUrl).then((response) =>
+        response.json()
+    ) as {
+        created: string
+        author: { login: string }
+    }
+
+    return {
+        raw: base64ToString(file.content),
+        url: file.download_url,
+        lastUpdate: new Date(infos.created),
+        author: infos.author.login,
+    }
+}
+
+async function getCommitAndContent(contentUrl: URL) {
+    return await fetch(contentUrl).then((response) => response.json()) as {
+        download_url: string
+        content: string
+        sha: string
+        last_commit_sha: string
+    }
+}
+
+function isNewsDirectory(entry: { name: string; type: string }): boolean {
+    return entry.type === 'dir' && entry.name.startsWith('.') === false
+}
diff --git a/src/blog/types.ts b/src/blog/types.ts
new file mode 100644
index 0000000..d035bea
--- /dev/null
+++ b/src/blog/types.ts
@@ -0,0 +1,12 @@
+export type NewsFrontMatter = {
+	title: string
+	description: string
+	tags?: string[]
+	'x-cohabit': {
+		links?: Record<string, string>[]
+		status: 'canceled' | 'futur' | 'current' | 'finished'
+		visibility?: 'public' | 'internal'
+		thumbnail: string
+		dueDate: string
+	}
+}