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import co from 'co';
import querystring from 'querystring';
import XMLHttpRequest from './xmlhttprequest';
export class Transport {
/**
* @param {dav.Credentials} credentials user authorization.
*/
constructor(credentials) {
this.credentials = credentials || null;
}
/**
* @param {dav.Request} request object with request info.
* @return {Promise} a promise that will be resolved with an xhr request after
* its readyState is 4 or the result of applying an optional request
* `transformResponse` function to the xhr object after its readyState is 4.
*
* Options:
*
* (Object) sandbox - optional request sandbox.
*/
send() {}
}
export class Basic extends Transport {
/**
* @param {dav.Credentials} credentials user authorization.
*/
constructor(credentials) {
super(credentials);
}
send(request, url, options) {
return co(function *() {
let sandbox = options && options.sandbox;
let transformRequest = request.transformRequest;
let transformResponse = request.transformResponse;
let onerror = request.onerror;
let xhr = new XMLHttpRequest();
if (sandbox) sandbox.add(xhr);
xhr.open(
request.method,
url,
true /* async */,
this.credentials.username,
this.credentials.password
);
if (transformRequest) transformRequest(xhr);
let result;
try {
yield xhr.send(request.requestData);
result = transformResponse ? transformResponse(xhr) : xhr;
} catch (error) {
if (onerror) onerror(error);
throw error;
}
return result;
}.bind(this));
}
}
/**
* @param {dav.Credentials} credentials user authorization.
*/
export class OAuth2 extends Transport {
constructor(credentials) {
super(credentials);
}
send(request, url, options={}) {
return co(function *() {
let sandbox = options.sandbox;
let transformRequest = request.transformRequest;
let transformResponse = request.transformResponse;
let onerror = request.onerror;
if (!('retry' in options)) options.retry = true;
let result, xhr;
try {
let token = yield access(this.credentials, options);
xhr = new XMLHttpRequest();
if (sandbox) sandbox.add(xhr);
xhr.open(request.method, url, true /* async */);
xhr.setRequestHeader('Authorization', `Bearer ${token}`);
if (transformRequest) transformRequest(xhr);
yield xhr.send(request.requestData);
result = transformResponse ? transformResponse(xhr) : xhr;
} catch (error) {
if (options.retry && xhr.status === 401) {
// Force expiration.
this.credentials.expiration = 0;
// Retry once at most.
options.retry = false;
return this.send(request, url, options);
}
if (onerror) onerror(error);
throw error;
}
return result;
}.bind(this));
}
}
/**
* @return {Promise} promise that will resolve with access token.
*/
function access(credentials, options) {
if (!credentials.accessToken) {
return getAccessToken(credentials, options);
}
if (credentials.refreshToken && isExpired(credentials)) {
return refreshAccessToken(credentials, options);
}
return Promise.resolve(credentials.accessToken);
}
function isExpired(credentials) {
return typeof credentials.expiration === 'number' &&
Date.now() > credentials.expiration;
}
let getAccessToken = co.wrap(function *(credentials, options) {
let sandbox = options.sandbox;
let xhr = new XMLHttpRequest();
if (sandbox) sandbox.add(xhr);
xhr.open('POST', credentials.tokenUrl, true /* async */);
xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
let data = querystring.stringify({
code: credentials.authorizationCode,
redirect_uri: credentials.redirectUrl,
client_id: credentials.clientId,
client_secret: credentials.clientSecret,
grant_type: 'authorization_code'
});
let now = Date.now();
yield xhr.send(data);
let response = JSON.parse(xhr.responseText);
credentials.accessToken = response.access_token;
credentials.refreshToken = 'refresh_token' in response ?
response.refresh_token :
null;
credentials.expiration = 'expires_in' in response ?
now + response.expires_in :
null;
return response.access_token;
});
let refreshAccessToken = co.wrap(function *(credentials, options) {
let sandbox = options.sandbox;
let xhr = new XMLHttpRequest();
if (sandbox) sandbox.add(xhr);
xhr.open('POST', credentials.tokenUrl, true /* async */);
xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
let data = querystring.stringify({
client_id: credentials.clientId,
client_secret: credentials.clientSecret,
refresh_token: credentials.refreshToken,
grant_type: 'refresh_token'
});
let now = Date.now();
yield xhr.send(data);
let response = JSON.parse(xhr.responseText);
credentials.accessToken = response.access_token;
credentials.expiration = 'expires_in' in response ?
now + response.expires_in :
null;
return response.access_token;
});
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