Extract document content in Node.js

This article presents an example of an application that allows for extracting document content using the Server-side Editor API feature.

# Dependencies

This example uses the following dependencies:

• axios

It also uses core dependencies from Node.js: crypto.

# Example

This example demonstrates how to use the Server-side Editor API to extract document content using Node.js. Make sure you have Node.js and npm installed before following these steps.

1. Create a new project and install dependencies:

mkdir cs-sse-api-example && cd cs-sse-api-example && npm init -y && npm i axios && touch sse-api.js

2. Open cs-sse-api-example/sse-api.js and paste the following code snippet:

const crypto = require( 'crypto' );
const axios = require( 'axios' );

// Set document id
const documentId = 'my_document_id';

// Update with your credentials and application endpoint
const environmentId = 'txQ9sTfqmXUyWU5LmDbr';
const apiSecret = '4zZBCQoPfRZ7Rr7TEnGAuRsGgbfF58Eg0PA8xcLD2kvPhjGjy4VGgB8k0hXn';
const applicationEndpoint = 'https://33333.cke-cs.com';
const apiEndpoint = `${ applicationEndpoint }/api/v5/${ environmentId }/collaborations/${ documentId }/evaluate-script`;

// Example script that extracts document content
const script = `
    const data = editor.getData();

    return {
        content: data,
        wordCount: data.split(' ').length,
        characterCount: data.length
    };
`;

const body = {
    'script': script,
    'user': {
        'id': 'txQ9sTfqmXUyWU5LmDbr',
        'name': 'System Process',
        'hidden_in_presence_list': false
    }
};

const CSTimestamp = Date.now();
const config = {
    headers: {
        'X-CS-Timestamp': CSTimestamp,
        'X-CS-Signature': generateSignature( apiSecret, 'POST', apiEndpoint, CSTimestamp, body )
    },
};

axios.post( apiEndpoint, body, config )
    .then( response => {
        console.log( 'Status:', response.status );
        console.log( 'Response data:', response.data );
    } ).catch( error => {
        console.log( 'Error:', error.message );
        console.log( 'Response data:', error.response.data );
    } );

function generateSignature( apiSecret, method, uri, timestamp, body ) {
    const url = new URL( uri );
    const path = url.pathname + url.search;
    const hmac = crypto.createHmac( 'SHA256', apiSecret );

    hmac.update( `${ method.toUpperCase() }${ path }${ timestamp }` );

    if ( body ) {
        hmac.update( Buffer.from( JSON.stringify( body ) ) );
    };

    return hmac.digest( 'hex' );
}

3. Update your credentials and the documentId values in the code snippet.

4. Execute the script:

node sse-api.js

After a successful response with a status code 201, you should see the document content, word count, and character count in the console output.