x-http-client/lib/http/handleRequestBody.js

An http client to simplify sending requests (HTTP & JSONP) in the browser.

var merge = require('x-common-utils/merge');
var isFunction = require('x-common-utils/isFunction');
var isPlainObject = require('x-common-utils/isPlainObject');
var hasOwn = require('../shared/hasOwn');

/**
 * Find a processor from `options.httpRequestBodyProcessor` to process the request body.
 *
 * @param {RequestOptions} options The request options.
 * @returns {any} Retruns the content that send to the server.
 */
function handleRequestBody(options) {
    var i;
    var l;
    var key;
    var content = null;
    var processor;
    var contentProcessor;
    var contentProcessors = [];
    var body = options.body;
    var processors = options.httpRequestBodyProcessor;
    var headers = isPlainObject(options.headers) ? options.headers : {};

    if (isPlainObject(body) && isPlainObject(processors)) {
        // Find all processors.
        for (key in processors) {
            if (hasOwn.call(processors, key)) {
                processor = processors[key];
                if (isPlainObject(processor)) {
                    contentProcessors.push({
                        key: key,
                        headers: processor.headers,
                        priority: processor.priority,
                        processor: processor.processor
                    });
                }
            }
        }

        // Sort the processors by its priority.
        contentProcessors.sort(function (a, b) {
            return b.priority - a.priority;
        });

        // Find the first non-undefined content.
        for (i = 0, l = contentProcessors.length; i < l; i += 1) {
            processor = contentProcessors[i];
            if (body[processor.key] !== undefined) {
                content = body[processor.key];
                contentProcessor = processor;
                break;
            }
        }

        // Use the processor to process the content.
        if (contentProcessor) {
            if (isPlainObject(contentProcessor.headers)) {
                headers = merge({}, contentProcessor.headers, headers);
            }
            processor = contentProcessor.processor;
            if (isFunction(processor)) {
                content = processor(content, options);
            }
        }
    }

    // Make sure that the headers is a plain object.
    options.headers = headers;

    return content;
}

module.exports = handleRequestBody;