fix(backup): remove support for message content based json loading

.docs/backup.md

@@ -22,4 +22,4 @@ Exports a JSON list of all of your added repositories, and their installed cogs.
 
 - Usage: `[p]backup import [json]`
 
-Imports, reinstalls, and reloads cogs from a valid export. Requires either the json export to be provided in the command's message content or to be attached to the command's message. Ignores itself and PyLav cogs.
+Imports, reinstalls, and reloads cogs from a valid export. Requires the JSON export to be attached to the invoking message as an attachment. Ignores itself and PyLav cogs.

backup/backup.py

@@ -59,12 +59,12 @@ class Backup(commands.Cog):
 
     @backup.command(name='import')
     @commands.is_owner()
-    async def backup_import(self, ctx: commands.Context, *, export: str = None):
-        """Import your installed repositories and cogs from an export."""
+    async def backup_import(self, ctx: commands.Context):
+        """Import your installed repositories and cogs from an export file."""
         if export is None and not len(ctx.message.attachments) == 0:
             export = await ctx.message.attachments[0].read()
         try:
-            export = json.loads(self.extract_json_from_codeblock(export))
+            export = json.loads(export)
         except json.JSONDecodeError:
             await ctx.send(error("Please provide a valid JSON export."))
             return
@@ -73,10 +73,3 @@ class Backup(commands.Cog):
         if downloader is None:
             await ctx.send(error(f"You do not have the `Downloader` cog loaded. Please run `{ctx.prefix}load downloader` and try again."))
             return
-
-    def extract_json_from_codeblock(self, text):
-        match = re.match(r"```(?:\w+)?\n(.*?)\n```", text, re.DOTALL)
-        if match:
-            return match.group(1).strip()
-        else:
-            return text