r 令牌中的 HTTR POST

Question

我想在這個網站上抓取代理數據： https : //thep.hoaphat.com.vn/distribution-systems

我正在使用以下代碼，但收到“令牌不匹配錯誤”：

httr::POST(
  url = "https://thep.hoaphat.com.vn/ajax/load_agency",
  body = list(
    type = "web",
    product_id = "7",
    province_id = "10",
    member_type = "1"
  ),
  encode = "form"
) -> res

dat <- httr::content(res)
str(dat)

我該如何解決？

Answer 1

數據請求到https://thep.hoaphat.com.vn/ajax/load_agency

做一點逆向工程，我發現請求是從這個 JS 文件發送的： https : //thep.hoaphat.com.vn/assets/js/functions.min.js

看看這個函數：

function loadAjax(t, e, n) {
    var a = {
        beforeSend: function() {},
        success: function() {}
    };
    $.extend(a, n),
    $.ajax({
        headers: {
            "X-CSRF-TOKEN": $('meta[name="csrf-token"]').attr("content")
        },
        type: "POST",
        url: t,
        data: e,
        beforeSend: function() {
            $("#loading_box").css({
                visibility: "visible",
                opacity: 0
            }).animate({
                opacity: 1
            }, 200),
            a.beforeSend()
        },
        success: function(t) {
            $("#loading_box").animate({
                opacity: 0
            }, 200, function() {
                $("#loading_box").css("visibility", "hidden")
            }),
            a.success(t)
        },
        error: function(t) {
            $("#loading_box").animate({
                opacity: 0
            }, 200, function() {
                $("#loading_box").css("visibility", "hidden")
            }),
            alert("Có lỗi xảy ra!")
        }
    })
}

您可以看到令牌來自名為csrf-token的meta標記。 現在您可以抓取該令牌值並發送請求以獲取數據：

library(rvest)
pg <- html_session("https://thep.hoaphat.com.vn/distribution-systems")
token <- read_html(pg) %>%
  html_node(xpath = "//meta[@name='csrf-token']") %>% html_attr("content")
pg <- 
  pg %>% rvest:::request_POST(
    "https://thep.hoaphat.com.vn/ajax/load_agency",
    config = httr::add_headers(`x-csrf-token` = token),
    body = list(
      type = "web",
      product_id = 1, # choose product
      province_id = 50, # choose province
      `member_type[]` = 1, # agency level 1
      `member_type[]` = 2 # agency level 2
    )
  )
data <- httr::content(pg$response)$data

結果：