OCR image containing Chinese text with Convertio API

ocr_convertio.sh

#!/bin/bash

echo "making request"
make_req_data=$(cat <<JSONDATA
    {
        "apikey": "__insert api key__",
        "input": "upload",
        "outputformat": "txt",
        "options": {
            "ocr_enabled": true,
            "ocr_settings": {
                "langs": ["chi_sim"]
            }
        }
    }
JSONDATA
)

make_req=$(curl -s -i -X POST -d "${make_req_data}" http://api.convertio.co/convert)
is_ok=$(echo $make_req | grep -c '"status":"ok"')

if [[ $is_ok == 1 ]]; then
    req_id=$(echo $make_req | grep -oP '"id":".+?"' | sed 's/^".*":"//' | sed 's/"$//')
    echo "id is ${req_id}"

    echo "uploading file"
    upload_file="capture.png"
    upload_req=$(curl -s -i -X PUT --upload-file "${upload_file}" "http://api.convertio.co/convert/${req_id}/${upload_file}")

    echo -n "waiting"
    is_done=0
    status_req=""

    while [[ $is_done == 0 ]]; do
        echo -n "."
        sleep 2

        status_req=$(curl -s -i -X GET "http://api.convertio.co/convert/${req_id}/status")
        is_done=$(echo $status_req | grep -c '"step_percent":100')
    done

    echo ""

    echo "getting file"
    output_url=$(echo $status_req | grep -oP '"url":".+?"' | sed 's/^".*":"//' | sed 's/"$//' | sed 's/\\//g')
    curl -s "${output_url}" -o output.txt

    echo "cleanup"
    cleanup_req=$(curl -s -i -X DELETE "http://api.convertio.co/convert/${req_id}")

else
    echo "error"
    echo $make_req
fi

echo "done"