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index.js
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index.js
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/*
* Copyright 2019 Google LLC
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
const auth = require('google-auth-library'); // for service account auth
const fetch = require('node-fetch');
const Language = require('../pbjs-genfiles/proto').google.cloud.language.v1;
async function main() {
let headers = {};
if (process.env['GOOGLE_APPLICATION_CREDENTIALS']) {
// service account authentication
const serviceUri =
'https://language.googleapis.com/google.cloud.language.v1.LanguageService';
const googleAuth = new auth.GoogleAuth();
const client = await googleAuth.getClient();
headers = await client.getRequestHeaders(serviceUri);
} else if (process.env['GOOGLE_API_KEY']) {
// API key authentication
headers = {'X-Goog-Api-Key': process.env['GOOGLE_API_KEY']};
} else {
throw new Error(
'Please set one of environment variables: GOOGLE_APPLICATION_CREDENTIALS or GOOGLE_API_KEY'
);
}
headers['Content-Type'] = 'application/x-protobuf';
headers['User-Agent'] = 'testapp/1.0';
const request = Language.AnalyzeEntitiesRequest.fromObject({
document: {
type: 'PLAIN_TEXT',
content: 'The rain in Spain stays mainly in the plain.',
},
});
const requestBuffer = Language.AnalyzeEntitiesRequest.encode(
request
).finish();
const url =
'https://language.googleapis.com/$rpc/google.cloud.language.v1.LanguageService/AnalyzeEntities';
const fetchResult = await fetch(url, {
headers,
method: 'post',
body: requestBuffer,
});
if (!fetchResult.ok) {
throw new Error(fetchResult.statusText);
}
const responseArrayBuffer = await fetchResult.arrayBuffer();
const response = Language.AnalyzeEntitiesResponse.decode(
Buffer.from(responseArrayBuffer)
);
console.log(response);
}
main().catch(err => {
console.error(err);
});