Merge pull request #2545 from bbielsa/csv-subscriptions-import

Add CSV Subscriptions Import

src/invidious/user/imports.cr

@@ -0,0 +1,27 @@
+require "csv"
+
+def parse_subscription_export_csv(csv_content : String)
+  rows = CSV.new(csv_content, headers: true)
+  subscriptions = Array(String).new
+
+  # Counter to limit the amount of imports.
+  # This is intended to prevent DoS.
+  row_counter = 0
+
+  rows.each do |row|
+    # Limit to 1200
+    row_counter += 1
+    break if row_counter > 1_200
+
+    # Channel ID is the first column in the csv export we can't use the header
+    # name, because the header name is localized depending on the
+    # language the user has set on their account
+    channel_id = row[0].strip
+
+    next if channel_id.empty?
+
+    subscriptions << channel_id
+  end
+
+  return subscriptions
+end