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SharePoint REST API contextinfo的使用

 3 years ago
source link: https://www.cnblogs.com/jianyus/p/14267484.html
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SharePoint REST API contextinfo的使用

　　前言

　　最近在请求SharePoint API的时候碰到403错误，很明显没有权限，那么，为什么呢？SharePoint页面中应该有上下文才是。好吧，如果你也遇到这样的问题，就先看看请求一下contextinfo这个方法吧。

　　正文

　　1.Ajax 请求SharePoint Online API，如下：

jQuery.ajax({
        url: "http://<site url>/_api/web/lists",
        type: "POST",
        data:  JSON.stringify({ '__metadata': { 'type': 'SP.List' }, 'AllowContentTypes': true,
 'BaseTemplate': 100, 'ContentTypesEnabled': true, 'Description': 'My list description', 'Title': 'Test' }
),
        headers: {
            "accept": "application/json;odata=verbose",
            "content-type": "application/json;odata=verbose",
            "content-length": <length of post body>,
            "X-RequestDigest": $("#__REQUESTDIGEST").val()
        },
        success: doSuccess,
        error: doError
});

　　2.但是，我们有时候没办法在页面中获取到"X-RequestDigest"，那怎么办呢？这时候就需要contextinfo这个方法了：

　　参考：Navigate the SharePoint data structure represented in the REST service | Microsoft Docs

POST https://{site_url}/_api/contextinfo
Authorization: "Bearer " + accessToken
Accept: "application/json;odata=verbose"

　　3.当然，我们有时候还会在C#中请求，如下图：

HttpWebRequest endpointRequest =(HttpWebRequest)HttpWebRequest.Create("http://<site url>/_api/contextinfo");
endpointRequest.Method = "POST";
endpointRequest.Accept = "application/json;odata=verbose";
HttpWebResponse endpointResponse = (HttpWebResponse)endpointRequest.GetResponse();

　　4.这样的方式是调用API常用的方式：

　　$.ajax({
        url: siteurl + '/_api/contextinfo',
        method: 'POST',
        headers: { 'Accept': 'application/json; odata=verbose' }
    }).done(function (data) {
        var requestDigest = data.d.GetContextWebInformation.FormDigestValue
        ......//your request
    })

　　总结

　　除了调用api的时候需要contextinfo这个方法，很多时候在post的时候，也需要先这样获取RequestDigest，通常get方法可以不需要。


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