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defmodule DaProductAppWeb.Plugs.ConditionalBodyReader do |
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@moduledoc """ |
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Custom body reader that captures raw body for NPCI UPI routes |
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before other plugs can consume it. |
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""" |
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import Plug.Conn |
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def init(opts), do: opts |
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def call(conn, _opts) do |
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if is_npci_route?(conn.request_path) do |
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require Logger |
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:-( |
Logger.info("ConditionalBodyReader: Processing NPCI route #{conn.request_path}") |
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:-( |
case read_body(conn) do |
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{:ok, body, conn} when body != "" -> |
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Logger.info("ConditionalBodyReader: Successfully read body of size #{byte_size(body)}") |
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Logger.debug("ConditionalBodyReader: Body content: #{inspect(body)}") |
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conn |
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|> assign(:raw_body, body) |
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{:ok, "", conn} -> |
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Logger.warning("ConditionalBodyReader: Empty body received") |
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conn |
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:-( |
|> assign(:raw_body, "") |
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{:error, reason} -> |
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:-( |
Logger.error("ConditionalBodyReader: Error reading body: #{inspect(reason)}") |
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:-( |
conn |
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end |
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else |
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# Not an NPCI route, pass through unchanged |
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conn |
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end |
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end |
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defp is_npci_route?(path) do |
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String.starts_with?(path, "/ReqHbt") or |
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String.starts_with?(path, "/ReqPay") or |
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String.starts_with?(path, "/ReqValQr") or |
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String.starts_with?(path, "/ReqChkTxn") or |
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String.starts_with?(path, "/ReqRegMob") or |
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String.starts_with?(path, "/ReqOtp") or |
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String.starts_with?(path, "/ReqSetCre") or |
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String.starts_with?(path, "/ReqMandateConf") or |
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# Also allow API-prefixed UPI routes used by partners: /api/v1/upi/* |
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String.starts_with?(path, "/api/v1/upi/") or |
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# Some controllers may use lowercase endpoints like /api/v1/upi/reconciliation |
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String.starts_with?(path, "/api/v1/upi") |
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end |
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end |