我从事的一个项目将Facebook页面作为其数据源之一。它周期性地从它导入一些数据，不涉及GUI。然后我们使用一个网络应用程序来显示我们已经拥有的数据。
并非所有信息都是公开的。这意味着我必须访问一次数据，然后保存它。然而，我不知道这个过程，我还没有找到一个好的教程。我想我需要一个access_token，我怎么能从用户得到它，一步一步?用户是一个facebook页面的管理员，他是否必须添加一些我们的FB应用程序的页面?
编辑:感谢@phwd的提示。我做了一个教程，如何获得一个永久的页面访问令牌，即使offline_access不再存在。
编辑:我刚刚发现它的答案在这里:持久的FB访问令牌服务器拉FB页面信息
当前回答
我根据donut的回答创建了一个小的NodeJS脚本。将以下文件存储在名为get-facebook-access-token.js的文件中:
const fetch = require('node-fetch');
const open = require('open');
const api_version = 'v9.0';
const app_id = '';
const app_secret = '';
const short_lived_token = '';
const page_name = '';
const getPermanentAccessToken = async () => {
try {
const long_lived_access_token = await getLongLivedAccessToken();
const account_id = await getAccountId(long_lived_access_token);
const permanent_page_access_token = await getPermanentPageAccessToken(
long_lived_access_token,
account_id
);
checkExpiration(permanent_page_access_token);
} catch (reason) {
console.error(reason);
}
};
const getLongLivedAccessToken = async () => {
const response = await fetch(
`https://graph.facebook.com/${api_version}/oauth/access_token?grant_type=fb_exchange_token&client_id=${app_id}&client_secret=${app_secret}&fb_exchange_token=${short_lived_token}`
);
const body = await response.json();
return body.access_token;
};
const getAccountId = async (long_lived_access_token) => {
const response = await fetch(
`https://graph.facebook.com/${api_version}/me?access_token=${long_lived_access_token}`
);
const body = await response.json();
return body.id;
};
const getPermanentPageAccessToken = async (
long_lived_access_token,
account_id
) => {
const response = await fetch(
`https://graph.facebook.com/${api_version}/${account_id}/accounts?access_token=${long_lived_access_token}`
);
const body = await response.json();
const page_item = body.data.find(item => item.name === page_name);
return page_item.access_token;
};
const checkExpiration = (access_token) => {
open(`https://developers.facebook.com/tools/debug/accesstoken/?access_token=${access_token}&version=${api_version}`);
}
getPermanentAccessToken();
填入常量，然后运行:
npm install node-fetch
npm install open
node get-facebook-access-token.js
运行脚本后，浏览器中会打开一个页面，显示令牌及其有效期。
其他回答
我找到了这个答案，它指的是这个工具，它真的很有用。
我希望当你读到这篇文章时，这个答案仍然有效。
我根据donut的回答创建了一个小的NodeJS脚本。将以下文件存储在名为get-facebook-access-token.js的文件中:
const fetch = require('node-fetch');
const open = require('open');
const api_version = 'v9.0';
const app_id = '';
const app_secret = '';
const short_lived_token = '';
const page_name = '';
const getPermanentAccessToken = async () => {
try {
const long_lived_access_token = await getLongLivedAccessToken();
const account_id = await getAccountId(long_lived_access_token);
const permanent_page_access_token = await getPermanentPageAccessToken(
long_lived_access_token,
account_id
);
checkExpiration(permanent_page_access_token);
} catch (reason) {
console.error(reason);
}
};
const getLongLivedAccessToken = async () => {
const response = await fetch(
`https://graph.facebook.com/${api_version}/oauth/access_token?grant_type=fb_exchange_token&client_id=${app_id}&client_secret=${app_secret}&fb_exchange_token=${short_lived_token}`
);
const body = await response.json();
return body.access_token;
};
const getAccountId = async (long_lived_access_token) => {
const response = await fetch(
`https://graph.facebook.com/${api_version}/me?access_token=${long_lived_access_token}`
);
const body = await response.json();
return body.id;
};
const getPermanentPageAccessToken = async (
long_lived_access_token,
account_id
) => {
const response = await fetch(
`https://graph.facebook.com/${api_version}/${account_id}/accounts?access_token=${long_lived_access_token}`
);
const body = await response.json();
const page_item = body.data.find(item => item.name === page_name);
return page_item.access_token;
};
const checkExpiration = (access_token) => {
open(`https://developers.facebook.com/tools/debug/accesstoken/?access_token=${access_token}&version=${api_version}`);
}
getPermanentAccessToken();
填入常量，然后运行:
npm install node-fetch
npm install open
node get-facebook-access-token.js
运行脚本后，浏览器中会打开一个页面，显示令牌及其有效期。
由于所有早期的答案都是旧的，并且由于facebook的政策不断变化，其他提到的答案可能不适用于永久代币。
经过大量的调试，我能够获得永不过期令牌使用以下步骤:
图形API浏览器:
Open graph api explorer and select the page for which you want to obtain the access token in the right-hand drop-down box, click on the Send button and copy the resulting access_token, which will be a short-lived token Copy that token and paste it in access token debugger and press debug button, in the bottom of the page click on extend token link, which will extend your token expiry to two months. Copy that extended token and paste it in the below url with your pageId, and hit in the browser url https://graph.facebook.com/{page_id}?fields=access_token&access_token={long_lived_token} U can check that token in access token debugger tool and verify Expires field , which will show never.
这是它
如果只请求页数据，则可以使用页访问令牌。您只需授权用户一次即可获得用户访问令牌;将有效期延长到两个月，然后请求该页的令牌。这在场景5中都有解释。请注意，获取的页面访问令牌仅在用户访问令牌有效期间有效。
While getting the permanent access token I followed above 5 steps as Donut mentioned. However in the 5th step while generating permanent access token its returning the long lived access token(Which is valid for 2 months) not permanent access token(which never expires). what I noticed is the current version of Graph API is V2.5. If you trying to get the permanent access token with V2.5 its giving long lived access token.Try to make API call with V2.2(if you are not able to change version in the graph api explorer,hit the API call https://graph.facebook.com/v2.2/{account_id}/accounts?access_token={long_lived_access_token} in the new tab with V2.2) then you will get the permanent access token(Which never expires)
