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-rw-r--r--app/validators/sha_validator.rb9
1 files changed, 9 insertions, 0 deletions
diff --git a/app/validators/sha_validator.rb b/app/validators/sha_validator.rb
new file mode 100644
index 00000000000..085fca4d65d
--- /dev/null
+++ b/app/validators/sha_validator.rb
@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+class ShaValidator < ActiveModel::EachValidator
+ def validate_each(record, attribute, value)
+ return if value.blank? || value.match(/\A\h{40}\z/)
+
+ record.errors.add(attribute, 'is not a valid SHA')
+ end
+end