Unblock script checks if own network is blocked

src/site/api/suggest.js

@@ -1,4 +1,5 @@
 const {Readable} = require("stream")
+const fs = require("fs").promises
 
 const db = require("../../lib/db")
 const collectors = require("../../lib/collectors")
@@ -189,15 +190,13 @@ module.exports = [
 	{
 		route: `/u/(${constants.external.username_regex})/unblock.sh`, methods: ["GET"], code: async ({fill}) => {
 			const username = fill[0]
+			let script = await fs.readFile(__dirname+"/utils/unblock.sh", "utf8")
+			script = script.replace(/<website_origin>/g, constants.website_origin)
+			script = script.replace(/<username>/g, username)
 			return {
 				statusCode: 200,
 				contentType: "text/plain",
-				content:
-					`# Good on you for looking at shell scripts before blindly running them.`
-					+`\n# This script contacts Instagram to get the profile's user ID, then sends the ID to Bibliogram. Bibliogram can take over from there.`
-					+`\ncurl 'https://www.instagram.com/${username}/' -Ss | grep -oE '"id":"[0-9]+"'`
-					+` | head -n 1 | grep -oE '[0-9]+' | curl --data-urlencode 'username=${username}' --data-urlencode 'user_id@-'`
-					+` '${constants.website_origin}/api/suggest_user/v1?plaintext=1'`
+				content: script
 			}
 		}
 	}

src/site/api/utils/unblock.sh

@@ -0,0 +1,22 @@
+# Good on you for looking at shell scripts before blindly running them.
+# This script contacts Instagram to get the profile's user ID, then sends the ID to Bibliogram. Bibliogram can take over from there.
+
+# Make a temporary directory
+tempdir=$(mktemp -d) || exit 1
+
+# Try to request from Instagram
+curl 'https://www.instagram.com/<username>/' -Ss > $tempdir/page.html
+
+if test -s $tempdir/page.html; then
+	# Request returned a page (file not empty)
+	grep -oE '"id":"[0-9]+"' $tempdir/page.html | head -n 1 | grep -oE '[0-9]+' | curl --data-urlencode 'username=<username>' --data-urlencode 'user_id@-' '<website_origin>/api/suggest_user/v1?plaintext=1'
+else
+	# Request was a redirect
+	echo "Your network is blocked by Instagram."
+	echo "You won't be able to unblock any more profiles."
+	echo "To be unblocked, wait a few hours without running this script."
+fi
+
+# Clean up, safely.
+rm -f $tempdir/page.html
+rm -d $tempdir

src/site/pug/blocked.pug

@@ -24,7 +24,7 @@ html#bibliogram-identifier-blocked
 						| #[a(href="#unblock-on-mac-or-linux") Unblock with shell], no download, Mac and Linux only
 						.hidden-section#unblock-on-mac-or-linux
 							p Open the Terminal application, then paste this code:
-							pre curl -Ss #{website_origin}/u/#{username}/unblock.sh | $SHELL
+							pre curl -Ss #{website_origin}/u/#{username}/unblock.sh | bash
 					li
 						| #[a(href="#unblock-with-userscript") Unblock automatically with userscript], any modern browser
 						.hidden-section#unblock-with-userscript