Download csv file which has javascript on-click download with requests-CodePudding

I'm trying to download a csv file from here:

onclick is just that: <a href="#" onclick="carregarDownloadArquivo('')">

carregarDownloadArquivo (I don't know java, tried to extract only this specific function inside the js):

function carregarDownloadArquivo(n){var t;
t=n!=null&&n!=""?n:getParameterByName("data")==null?"":getParameterByName("data");
$("#divloadArquivo").show();
$.ajax({url:"/NegociosRealizados/Registro/DownloadArquivoDiretorio?data=" t}).then(function(t,i,r){var u;
if(t!="null"&&t!=""){var f=convertBase64(t),e=window.navigator.userAgent,o=e.indexOf("MSIE ");
(n==null||n=="")&&(n=retornaDataHoje());
u=n "_NEGOCIOSBALCAO.CSV";
o>0||!!navigator.userAgent.match(/Trident.*rv\:11\./)?DownloadArquivoIE(u,f,r.getAllResponseHeaders()):DownloadArquivo(u,f,r.getAllResponseHeaders())}$("#divloadArquivo").hide()})}

Extra functions to understand carregardownload:

function DownloadArquivoIE(n,t,i){var r=new Blob(t,{type:i});
navigator.msSaveBlob(r,n)}function DownloadArquivo(n,t,i){var r=new Blob(t,{type:i});
saveAs(r,n)}function getParameterByName(n,t){t||(t=window.location.href);
n=n.replace(/[\[\]]/g,"\\$&");
var r=new RegExp("[?&]" n "(=([^&#]*)|&|#|$)"),i=r.exec(t);
return i?i[2]?decodeURIComponent(i[2].replace(/\ /g," ")):"":null}

Not so sure about ajax and send calls. Also I don't know how their code is downloading the csv file

CodePudding user response：

Try to decode the base64-encoded response from the server:

import base64
import requests

url = "https://bvmf.bmfbovespa.com.br/NegociosRealizados/Registro/DownloadArquivoDiretorio?data="

t = base64.b64decode(requests.get(url).text)
print(t.decode("utf-8"))

Prints:

Data/Hora da ultima atualizacao: 11/11/2022 16:38:20
Instrumento Financeiro;Emissor;Codigo IF;Quantidade Negociada;Preco Negocio;Volume Financeiro R$;Taxa Negocio;Origem Negocio;Horario Negocio;Data Negocio;Cod. Identificador do Negocio;Cod. Isin;Data Liquidacao
DEB;STAGENEBRA;MSGT23;2200;980,96524400;2158123,54;7,8701;Pre-registro - Voice;16:34:56;11/11/2022;#97441063;BRMSGTDBS050;12/11/2022
CRA;VERTSEC;CRA022006N5;306;972,49346900;297583,00;,0000;Pre-registro - Voice;16:34:49;11/11/2022;#97441055;BRVERTCRA2S9;11/11/2022
CRI;VIRGOSEC;21L0823062;96;1012,81900600;97230,62;,0000;Pre-registro - Voice;16:33:21;11/11/2022;#97441034;BRIMWLCRIAF2;11/11/2022
CRI;VIRGOSEC;21L0823062;356;1012,81900600;360563,57;,0000;Pre-registro - Voice;16:32:55;11/11/2022;#97441028;BRIMWLCRIAF2;11/11/2022
COE;;IT5322K6C2H;10;1000,00000000;10000,00;;Registro;16:31:52;11/11/2022;#2022111113338428;;11/11/2022

...and so on.