MAX Exchange API client in Bash

maxapi.sh

#!/bin/bash
base_url="https://max-api.maicoin.com"
​
ts=$(date "+%s")
server_ts=$(curl -s $base_url/api/v2/timestamp)
​
offset=$(( $server_ts - $ts ))
​
function nonce()
{
    local mts=$(($ts * 1000))
    echo $mts
}
​
​
function generate_payload()
{
    local req_path=$1
    local -n ref_params=$2
​
    declare -A payload
    payload[nonce]=$(nonce)
    payload[path]=$req_path
​
    for k in "${!ref_params[@]}"
    do
        payload[$k]=${ref_params[$k]}
    done
​
    for k in "${!payload[@]}"
    do
        echo "\"$k\""
        echo "\"${payload[$k]}\""
    done | jq -c -n 'reduce inputs as $i ({}; . + { ($i): (input|(tonumber? // .)) })'
}
​
function hmac_sha1()
{
    local value=$1
    local key=$2
    echo -n "$value" | openssl dgst -sha256 -hmac "$key" | sed -e 's/^.* //'
}
​
function accounts()
{
    req_path="/api/v2/members/accounts"
    declare -A params=()
    payload_json=$(generate_payload $req_path params)
​
    encoded_payload=$(echo -n "$payload_json" | base64)
​
    payload_sig=$(hmac_sha1 "$encoded_payload" "$MAX_API_SECRET")
​
    curl -X GET -H "Content-Type: application/json" \
        -H "Accept: application/json" \
        -H "X-MAX-ACCESSKEY: $MAX_API_KEY" \
        -H "X-MAX-PAYLOAD: $encoded_payload" \
        -H "X-MAX-SIGNATURE: $payload_sig" \
        --data "$payload_json" \
        "${base_url}${req_path}"
}
​
​
​
accounts