From d6ee6c0411620a8dd0363ccd86f163b13ab3b022 Mon Sep 17 00:00:00 2001
From: Cadence Fish <cloudrac3r@vivaldi.net>
Date: Sat, 22 Feb 2020 23:44:17 +1300
Subject: [PATCH] Add updater page, disabled by default

---
 src/lib/constants.js          |  4 ++-
 src/site/api/admin.js         | 62 +++++++++++++++++++++++++++++++++++
 src/site/pug/admin_update.pug | 32 ++++++++++++++++++
 src/site/sass/main.sass       | 26 +++++++++++++++
 4 files changed, 123 insertions(+), 1 deletion(-)
 create mode 100644 src/site/api/admin.js
 create mode 100644 src/site/pug/admin_update.pug

diff --git a/src/lib/constants.js b/src/lib/constants.js
index 412c8b0..9ad2dac 100644
--- a/src/lib/constants.js
+++ b/src/lib/constants.js
@@ -25,13 +25,15 @@ let constants = {
 
 	settings: {
 		rss_enabled: true,
-		display_feed_validation_buttons: false
+		display_feed_validation_buttons: false,
+		enable_updater_page: false
 	},
 
 	caching: {
 		image_cache_control: `public, max-age=${7*24*60*60}`,
 		resource_cache_time: 30*60*1000,
 		instance_list_cache_time: 3*60*1000,
+		updater_cache_time: 2*60*1000,
 		db_user_id: true,
 		db_post_n3: true
 	},
diff --git a/src/site/api/admin.js b/src/site/api/admin.js
new file mode 100644
index 0000000..cb96b43
--- /dev/null
+++ b/src/site/api/admin.js
@@ -0,0 +1,62 @@
+const child_process = require("child_process")
+const constants = require("../../lib/constants")
+const {render} = require("pinski/plugins")
+
+function run(command) {
+	return new Promise((resolve, reject) => {
+		child_process.exec(command, {encoding: "utf8"}, (error, stdout, stderr) => {
+			if (error) reject(error)
+			else resolve({stdout, stderr})
+		})
+	})
+}
+
+let lastFetchRunAt = 0
+async function fetch() {
+	if (lastFetchRunAt + constants.caching.updater_cache_time < Date.now()) {
+		await run("git fetch origin")
+		lastFetchRunAt = Date.now()
+	}
+}
+
+module.exports = [
+	{route: "/admin/updater", methods: ["GET"], code: async () => {
+		if (constants.settings.enable_updater_page) {
+			let {stdout: current} = await run("git rev-parse --abbrev-ref HEAD")
+			current = current.trim()
+			let {stdout: upstream} = await run("git rev-parse --abbrev-ref '@{u}'")
+			upstream = upstream.trim()
+			if (current !== "master" || upstream !== "origin/master") {
+				return render(200, "pug/admin_update.pug", {error: `Refusing to automatically update: current is ${current}, upstream is ${upstream}, need master and origin/master`})
+			} else {
+				await fetch()
+				let {stdout: log} = await run("git log --oneline origin/master ^master")
+				log = log.trim()
+				const numberOfCommits = log === "" ? 0 : log.split("\n").length
+				const {stdout: changedFiles} = await run("git diff master origin/master --name-only")
+				const changedFilesList = changedFiles.trim().split("\n")
+				let requiresRestart = false
+				let requiresDeps = false
+				if (changedFilesList.some(c => c.startsWith("src/lib") || c === "server.js")) {
+					requiresRestart = true
+				}
+				if (changedFilesList.some(c => c === "package.json" || c === "package-lock.json")) {
+					requiresDeps = true
+					requiresRestart = true
+				}
+				const formattedLog = log.split("\n").map(line => {
+					if (!line) return line // skip for empty string
+					const [hash, message] = line.match(/(\w+) (.*)$/).slice(1)
+					return {hash, message}
+				})
+				return render(200, "pug/admin_update.pug", {formattedLog, numberOfCommits, requiresDeps, requiresRestart})
+			}
+		} else {
+			return render(403, "pug/friendlyerror.pug", {
+				statusCode: 403,
+				title: "Updater page disabled",
+				message: "Updater page disabled"
+			})
+		}
+	}}
+]
diff --git a/src/site/pug/admin_update.pug b/src/site/pug/admin_update.pug
new file mode 100644
index 0000000..1e46f2b
--- /dev/null
+++ b/src/site/pug/admin_update.pug
@@ -0,0 +1,32 @@
+//- Needs {error} or {formattedLog, numberOfCommits, requiresDeps, requiresRestart}
+
+doctype html
+html
+	head
+		title Updater | Bibliogram
+		include includes/head
+	body.updater-page
+		if error
+			h1 Aw man.
+			div= error
+		else
+			h1 Bibliogram updater
+			if numberOfCommits > 0
+				div You are #{numberOfCommits} commits behind (most recent first):
+				div.commits
+					each line in formattedLog
+						div.commit
+							code.hash= line.hash
+							span.message= line.message
+				div
+					if requiresDeps
+						span.attention You must run #[code npm install] after pulling.
+					else
+						span No changes to dependencies.
+				div
+					if requiresRestart
+						span.attention You must restart Bibliogram after pulling.
+					else
+						span You do not need to restart Bibliogram after pulling.
+			else
+				div You are running the latest version. Hurrah!
diff --git a/src/site/sass/main.sass b/src/site/sass/main.sass
index ef0e10d..ef90438 100644
--- a/src/site/sass/main.sass
+++ b/src/site/sass/main.sass
@@ -518,3 +518,29 @@ body
 		border: 2px solid #aaa
 		font-weight: bold
 		background-color: #282828
+
+.updater-page
+	font-size: 20px
+	max-width: 800px
+	margin: 0 auto
+	color: #222
+
+	code
+		font-size: 0.9em
+		background: #ccc
+		color: #000
+		padding: 0px 4px
+		border-radius: 2px
+
+	.commits
+		border-left: 2px solid #555
+		margin: 10px 0px
+		padding-left: 10px
+
+		.hash
+			margin-right: 6px
+
+	.attention
+		border-left: 2px solid
+		padding-left: 8px
+		color: #700