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| /**
* Copyright 2017 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import { assert } from '@firebase/util';
import { logWrapper, warn } from './util/util';
import { jsonEval } from '@firebase/util';
import { safeGet } from '@firebase/util';
import { querystring } from '@firebase/util';
import { ServerActions } from './ServerActions';
import { RepoInfo } from './RepoInfo';
import { AuthTokenProvider } from './AuthTokenProvider';
import { Query } from '../api/Query';
/**
* An implementation of ServerActions that communicates with the server via REST requests.
* This is mostly useful for compatibility with crawlers, where we don't want to spin up a full
* persistent connection (using WebSockets or long-polling)
*/
export class ReadonlyRestClient extends ServerActions {
reportStats(stats: { [k: string]: any }): void {
throw new Error('Method not implemented.');
}
/** @private {function(...[*])} */
private log_: (...args: any[]) => void = logWrapper('p:rest:');
/**
* We don't actually need to track listens, except to prevent us calling an onComplete for a listen
* that's been removed. :-/
*
* @private {!Object.<string, !Object>}
*/
private listens_: { [k: string]: Object } = {};
/**
* @param {!Query} query
* @param {?number=} tag
* @return {string}
* @private
*/
static getListenId_(query: Query, tag?: number | null): string {
if (tag !== undefined) {
return 'tag$' + tag;
} else {
assert(
query.getQueryParams().isDefault(),
"should have a tag if it's not a default query."
);
return query.path.toString();
}
}
/**
* @param {!RepoInfo} repoInfo_ Data about the namespace we are connecting to
* @param {function(string, *, boolean, ?number)} onDataUpdate_ A callback for new data from the server
* @param {AuthTokenProvider} authTokenProvider_
* @implements {ServerActions}
*/
constructor(
private repoInfo_: RepoInfo,
private onDataUpdate_: (
a: string,
b: any,
c: boolean,
d: number | null
) => void,
private authTokenProvider_: AuthTokenProvider
) {
super();
}
/** @inheritDoc */
listen(
query: Query,
currentHashFn: () => string,
tag: number | null,
onComplete: (a: string, b: any) => void
) {
const pathString = query.path.toString();
this.log_(
'Listen called for ' + pathString + ' ' + query.queryIdentifier()
);
// Mark this listener so we can tell if it's removed.
const listenId = ReadonlyRestClient.getListenId_(query, tag);
const thisListen = {};
this.listens_[listenId] = thisListen;
const queryStringParamaters = query
.getQueryParams()
.toRestQueryStringParameters();
this.restRequest_(
pathString + '.json',
queryStringParamaters,
(error, result) => {
let data = result;
Iif (error === 404) {
data = null;
error = null;
}
Eif (error === null) {
this.onDataUpdate_(pathString, data, /*isMerge=*/ false, tag);
}
if (safeGet(this.listens_, listenId) === thisListen) {
let status;
Eif (!error) {
status = 'ok';
} else if (error == 401) {
status = 'permission_denied';
} else {
status = 'rest_error:' + error;
}
onComplete(status, null);
}
}
);
}
/** @inheritDoc */
unlisten(query: Query, tag: number | null) {
const listenId = ReadonlyRestClient.getListenId_(query, tag);
delete this.listens_[listenId];
}
/** @inheritDoc */
refreshAuthToken(token: string) {
// no-op since we just always call getToken.
}
/**
* Performs a REST request to the given path, with the provided query string parameters,
* and any auth credentials we have.
*
* @param {!string} pathString
* @param {!Object.<string, *>} queryStringParameters
* @param {?function(?number, *=)} callback
* @private
*/
private restRequest_(
pathString: string,
IqueryStringParameters: { [k: string]: any } = {},
callback: ((a: number | null, b?: any) => void) | null
) {
queryStringParameters['format'] = 'export';
this.authTokenProvider_
.getToken(/*forceRefresh=*/ false)
.then(authTokenData => {
const authToken = authTokenData && authTokenData.accessToken;
Iif (authToken) {
queryStringParameters['auth'] = authToken;
}
const url =
(this.repoInfo_.secure ? 'https://' : 'http://') +
this.repoInfo_.host +
pathString +
'?' +
querystring(queryStringParameters);
this.log_('Sending REST request for ' + url);
const xhr = new XMLHttpRequest();
xhr.onreadystatechange = () => {
if (callback && xhr.readyState === 4) {
this.log_(
'REST Response for ' + url + ' received. status:',
xhr.status,
'response:',
xhr.responseText
);
let res = null;
Eif (xhr.status >= 200 && xhr.status < 300) {
try {
res = jsonEval(xhr.responseText);
} catch (e) {
warn(
'Failed to parse JSON response for ' +
url +
': ' +
xhr.responseText
);
}
callback(null, res);
} else {
// 401 and 404 are expected.
if (xhr.status !== 401 && xhr.status !== 404) {
warn(
'Got unsuccessful REST response for ' +
url +
' Status: ' +
xhr.status
);
}
callback(xhr.status);
}
callback = null;
}
};
xhr.open('GET', url, /*asynchronous=*/ true);
xhr.send();
});
}
}
|