R：eBay OAuth - 客户凭证授予请求

Question

我正在尝试了解 OAuth，并决定使用 eBay API。在关注他们的 instructions 以获取应用程序访问令牌时，我收到了 400 错误。

library(jsonlite)
library(httr)

# OAuth credentials
client_id <- "x"
client_secret <- "x"
# Required - https://developer.ebay.com/api-docs/static/oauth-base64-credentials.html
encod_oauth <- base64_enc(paste0(client_id, ":", client_secret))

auth_token_res <- 
  POST("https://api.sandbox.ebay.com/identity/v1/oauth2/token",
       add_headers("Content-Type" = "application/x-www-form-urlencoded",
                   Authorization = paste0("Basic ", encod_oauth)),
       body = list(grant_type = "client_credentials", 
                   scope = urlEncode("https://api.ebay.com/oauth/api_scope", reserved = T)))

检查内容，这显然与正文中的grant_type有关。

content(auth_token_res)
$error_description
[1] "grant type in request is not supported by the authorization server"

正文请求有什么问题，为什么？

Answer 1

花了一个半小时，但我做到了。您可以在下面找到用 R 编写的代码。祝您有美好的一天。我希望这将是解决方案。

library(httr)
library(jsonlite)
library(base64enc)

rm(list=ls()) # delete memory
code <- base64encode(charToRaw("TT"));

#getting data from api 
resp <- POST("https://api.ebay.com/identity/v1/oauth2/token",
             query = list(grant_type="client_credentials",scope="https://api.ebay.com/oauth/api_scope"),
            add_headers(`Content-Type`='application/x-www-form-urlencoded',
                        `Authorization`=paste("Basic",code, sep=" ")))

if (http_type(resp) != "application/json") {
  stop("API did not return json", call. = FALSE)
}
parsed <- jsonlite::fromJSON(content(resp, "text",encoding = "UTF-8"), simplifyVector = TRUE)
parsed_v2 <- parsed[["response"]]

Answer 2

我在这里留下一个工作示例。这样做非常困难，但我做到了。 首先我得到应用程序访问令牌，然后我将它用于搜索 api。是node.js代码。

var axios = require('axios');
var qs = require("querystring");
//The client credentials grant flow
//https://developer.ebay.com/api-docs/static/oauth-client-credentials-grant.html

axios("https://api.ebay.com/identity/v1/oauth2/token", {
    method: "POST",
    headers: {
        "Content-Type": "application/x-www-form-urlencoded",
        "Authorization": "Basic " + Buffer.from(
            //App ID (Client ID):
            `your id and secret key here with : seperated`
        ).toString('base64')
    },
    data: qs.stringify({
        grant_type: "client_credentials",
        scope: "https://api.ebay.com/oauth/api_scope",
        // parsed from redirect URI after returning from eBay,

    })
})
    .then(response => {
        console.log("Application data");
        console.log(response.data.access_token);

        axios("https://api.ebay.com/buy/browse/v1/item_summary/search", {
            method: "GET",
            headers: {
                Authorization: "Bearer " + response.data.access_token
            },
            params: {
                category_ids: "108765",
                q: "Beatles"
            }
        })
            .then(res => {
                // console.log(res.data);
                res.data.itemSummaries.map((e) => console.log(e.title));
            })
            .catch(err => {
                console.log("**************Get search error**************")
                console.log(err)
            });
    })
    .catch(err => {
        console.log("**************Get access token error**************")
        console.log(err)
    });