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319 lines (290 loc) · 8.48 KB
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/**
* 每位工程师都有保持代码优雅的义务
* Each engineer has a duty to keep the code elegant
**/
const request = require('superagent');
const debug = require('debug')('request');
const md5 = require('md5');
const AVPromise = require('./promise');
const Cache = require('./cache');
const AVError = require('./error');
const AV = require('./av');
const _ = require('underscore');
let getServerURLPromise;
// 服务器请求的节点 host
const API_HOST = {
cn: 'https://api.leancloud.cn',
us: 'https://us-api.leancloud.cn',
};
// 计算 X-LC-Sign 的签名方法
const sign = (key, isMasterKey) => {
const now = new Date().getTime();
const signature = md5(now + key);
if (isMasterKey) {
return `${signature},${now},master`;
}
return `${signature},${now}`;
};
const checkRouter = (router) => {
const routerList = [
'batch',
'classes',
'files',
'date',
'functions',
'call',
'login',
'push',
'search/select',
'requestPasswordReset',
'requestEmailVerify',
'requestPasswordResetBySmsCode',
'resetPasswordBySmsCode',
'requestMobilePhoneVerify',
'requestLoginSmsCode',
'verifyMobilePhone',
'requestSmsCode',
'verifySmsCode',
'users',
'usersByMobilePhone',
'cloudQuery',
'qiniu',
'fileTokens',
'statuses',
'bigquery',
'search/select',
'subscribe/statuses/count',
'subscribe/statuses',
'installations',
];
if (routerList.indexOf(router) === -1 &&
!(/users\/[^\/]+\/updatePassword/.test(router)) &&
!(/users\/[^\/]+\/friendship\/[^\/]+/.test(router))
) {
throw new Error(`Bad router: ${router}.`);
}
};
const ajax = (method, resourceUrl, data, headers = {}, onprogress) => {
debug(method, resourceUrl, data, headers);
const promise = new AVPromise();
const req = request(method, resourceUrl)
.set(headers)
.send(data)
.end((err, res) => {
if (res) {
debug(res.status, res.body, res.text);
}
if (err) {
if (res) {
err.statusCode = res.status;
err.responseText = res.text;
err.response = res.body;
}
return promise.reject(err);
}
return promise.resolve(res.body, res.status, res);
});
if (onprogress) {
req.on('progress', onprogress);
}
return promise;
};
const setHeaders = (sessionToken) => {
const headers = {
'X-LC-Id': AV.applicationId,
'Content-Type': 'application/json;charset=UTF-8',
};
if (AV.masterKey && AV._useMasterKey) {
headers['X-LC-Sign'] = sign(AV.masterKey, true);
} else {
headers['X-LC-Sign'] = sign(AV.applicationKey);
}
if (AV._config.applicationProduction !== null) {
headers['X-LC-Prod'] = AV._config.applicationProduction;
}
if (!AV._config.isNode) {
headers['X-LC-UA'] = `AV/${AV.version}`;
} else {
// LeanEngine need use AV._config.userAgent
headers['User-Agent'] = AV._config.userAgent || `AV/${AV.version}; Node.js/${process.version}`;
}
const promise = new AVPromise();
// Pass the session token
if (sessionToken) {
headers['X-LC-Session'] = sessionToken;
promise.resolve(headers);
} else if (!AV._config.disableCurrentUser) {
AV.User.currentAsync().then((currentUser) => {
if (currentUser && currentUser._sessionToken) {
headers['X-LC-Session'] = currentUser._sessionToken;
}
promise.resolve(headers);
});
} else {
promise.resolve(headers);
}
return promise;
};
const createApiUrl = (route, className, objectId, method, dataObject) => {
// TODO: 兼容 AV.serverURL 旧方式设置 API Host，后续去掉
if (AV.serverURL) {
AV._config.APIServerURL = AV.serverURL;
console.warn('Please use AV._config.APIServerURL to replace AV.serverURL, and it is an internal interface.');
}
let apiURL = AV._config.APIServerURL || API_HOST.cn;
if (apiURL.charAt(apiURL.length - 1) !== '/') {
apiURL += '/';
}
apiURL += `1.1/${route}`;
if (className) {
apiURL += `/${className}`;
}
if (objectId) {
apiURL += `/${objectId}`;
}
if ((route === 'users' || route === 'classes') && dataObject) {
apiURL += '?';
if (dataObject._fetchWhenSave) {
delete dataObject._fetchWhenSave;
apiURL += '&new=true';
}
if (dataObject._where) {
apiURL += `&where=${encodeURIComponent(JSON.stringify(dataObject._where))}`;
delete dataObject._where;
}
}
if (method.toLowerCase() === 'get') {
if (apiURL.indexOf('?') === -1) {
apiURL += '?';
}
for (const k in dataObject) {
if (typeof dataObject[k] === 'object') {
dataObject[k] = JSON.stringify(dataObject[k]);
}
apiURL += `&${k}=${encodeURIComponent(dataObject[k])}`;
}
}
return apiURL;
};
const cacheServerURL = (serverURL, ttl) => {
if (typeof ttl !== 'number') {
ttl = 3600;
}
return Cache.setAsync('APIServerURL', serverURL, ttl * 1000);
};
// handle AV._request Error
const handleError = (res) => {
const promise = new AVPromise();
/**
When API request need to redirect to the right location,
can't use browser redirect by http status 307, as the reason of CORS,
so API server response http status 410 and the param "location" for this case.
*/
if (res.statusCode === 410) {
cacheServerURL(res.response.api_server, res.response.ttl).then(() => {
promise.resolve(res.response.location);
}).catch((error) => {
promise.reject(error);
});
} else {
let errorJSON = { code: -1, error: res.responseText };
if (res.response && res.response.code) {
errorJSON = res.response;
} else if (res.responseText) {
try {
errorJSON = JSON.parse(res.responseText);
} catch (e) {
// If we fail to parse the error text, that's okay.
}
}
// Transform the error into an instance of AVError by trying to parse
// the error string as JSON.
const error = new AVError(errorJSON.code, errorJSON.error);
promise.reject(error);
}
return promise;
};
const setServerUrl = (serverURL) => {
AV._config.APIServerURL = `https://${serverURL}`;
// 根据新 URL 重新设置区域
const newRegion = _.findKey(API_HOST, item => item === AV._config.APIServerURL);
if (newRegion) {
AV._config.region = newRegion;
}
};
const refreshServerUrlByRouter = () => {
const url = `https://app-router.leancloud.cn/1/route?appId=${AV.applicationId}`;
return ajax('get', url).then(servers => {
if (servers.api_server) {
setServerUrl(servers.api_server);
return cacheServerURL(servers.api_server, servers.ttl);
}
}, error => {
// bypass all non-4XX errors
if (error.statusCode >= 400 && error.statusCode < 500) {
throw error;
}
});
};
const setServerUrlByRegion = (region = 'cn') => {
getServerURLPromise = new AVPromise();
const promise = getServerURLPromise;
// 如果用户在 init 之前设置了 APIServerURL，则跳过请求 router
if (AV._config.APIServerURL) {
promise.resolve();
return;
}
// if not china server region, do not use router
if (region === 'cn') {
Cache.getAsync('APIServerURL').then((serverURL) => {
if (serverURL) {
setServerUrl(serverURL);
} else {
return refreshServerUrlByRouter();
}
}).then(() => {
promise.resolve();
}).catch((error) => {
promise.reject(error);
});
} else {
AV._config.region = region;
AV._config.APIServerURL = API_HOST[region];
promise.resolve();
}
};
/**
* route is classes, users, login, etc.
* objectId is null if there is no associated objectId.
* method is the http method for the REST API.
* dataObject is the payload as an object, or null if there is none.
* @ignore
*/
const AVRequest = (route, className, objectId, method, dataObject = {}, sessionToken) => {
if (!AV.applicationId) {
throw new Error('You must specify your applicationId using AV.init()');
}
if (!AV.applicationKey && !AV.masterKey) {
throw new Error('You must specify a AppKey using AV.init()');
}
checkRouter(route);
if (!getServerURLPromise) {
return AVPromise.error(new Error('Not initialized'));
}
return getServerURLPromise.then(() => {
const apiURL = createApiUrl(route, className, objectId, method, dataObject);
return setHeaders(sessionToken).then(
headers => ajax(method, apiURL, dataObject, headers)
.then(
null,
res => handleError(res)
.then(location => ajax(method, location, dataObject, headers))
)
);
});
};
module.exports = {
ajax,
request: AVRequest,
setServerUrlByRegion,
};