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I have been trying to generate an auth-url for quite some time now to make an outbound call from my n8n instance using HTTP Request node. But Zadarma wants a signature key for every call made.

I always get this error: Not authorized - 401

This is the code piece that generates signature using commands:

API_SECRET_KEY='{{$json["api_secret_key"]}}'
METHOD='/v1/request/callback/'
FROM='{{$json["from"]}}'
TO='{{$json["to"]}}'
SIP='{{$json["sip"] || ""}}'
PRED='{{$json["predicted"] || ""}}'

QS="from=${FROM}"
[ -n "$PRED" ] && QS="${QS}&predicted=${PRED}"
[ -n "$SIP" ] && QS="${QS}&sip=${SIP}"
QS="${QS}&to=${TO}"

MD5Q=$(printf "%s" "$QS" | md5sum | awk '{print $1}')
# If your system has no md5sum, use:
# MD5Q=$(printf "%s" "$QS" | openssl md5 | awk '{print $2}')

SIG=$(printf "%s%s%s" "$METHOD" "$QS" "$MD5Q" | openssl dgst -sha1 -hmac "$API_SECRET_KEY" -binary | base64)

URL="https://api.zadarma.com${METHOD}?${QS}"
AUTH="${API_USER_KEY}:${SIG}"

printf '{"url":"%s","authorization":"%s"}' "$URL" "$AUTH"
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