low-code-service/src/workflow/workflow-executor.ts

to handle workflow execution, handlebars execution and condition execution for low code service

import { cleanHandleBarTemplate, getTemplateData } from '../handlebars/handlebars-handler';
import { validateDataUsingFilters } from '../condition-executor/condition-handler';
import { GetWorkFlowRequestData } from './types';

function convertToString(data: any) {
	if (typeof data === 'string') {
		return data;
	}
	return JSON.stringify(data);
}

export const getRequestData = (apiData: GetWorkFlowRequestData, params) => {
    const { headerTemplate, requestTemplate, urlTemplate } = apiData;

    let compiledHeaders = getTemplateData(convertToString(headerTemplate) || '', params);
    compiledHeaders = cleanHandleBarTemplate(compiledHeaders, '{}');
    compiledHeaders = JSON.parse(compiledHeaders);

    let compiledRequestBody = getTemplateData(convertToString(requestTemplate) || '', params);
    compiledRequestBody = cleanHandleBarTemplate(compiledRequestBody, '{}');
    compiledRequestBody = JSON.parse(compiledRequestBody);

    let compiledUrl = getTemplateData(convertToString(urlTemplate) || '', params);
    compiledUrl = cleanHandleBarTemplate(compiledUrl, '');

    let isFormData = false;

    if (compiledHeaders) {
        const contentType = compiledHeaders['Content-Type'] || compiledHeaders['content-type'];
        if (contentType && contentType.includes('application/x-www-form-urlencoded')) {
            isFormData = true;
        }
    }

    return {
        headers: compiledHeaders,
        [isFormData ? 'form': 'body']: compiledRequestBody,
        url: compiledUrl,
     };
}

const getRequestBody = (obj) => {
    if (!obj) {
        return '';
    }
    let strToReturn = '';
    for (const key in obj) {
        strToReturn += ` -d '${key}=${obj[key]}'`;
    }
    return strToReturn;
}

export const getCurlCommand = (apiData: GetWorkFlowRequestData, params) => {
    try {
        const { method } = apiData;
        const { headers: compiledHeaderTemplate, body: compiledRequestTemplate, url: compiledUrl, form: compiledFormData } = getRequestData(apiData, params);
    
        const finalHeaders = Object.keys(compiledHeaderTemplate).reduce((acc, curr) => {
            acc+=(` -H '${curr}:${compiledHeaderTemplate[curr]}'`);
            return acc;
        }, '');
    
        const body = compiledFormData ? `${getRequestBody(compiledFormData)}` : `-d '${JSON.stringify(compiledRequestTemplate)}'`;
        const curlCommand = `curl -X ${method} ${finalHeaders} ${body} ${compiledUrl}`;
        return curlCommand;
    } catch (err) {
        throw new Error('Failed to generate CURL');
    }
}