index.js

/*!
 * Infermedica.
 *
 * Main entry file.
 * @author Jesse Okeya <jesseokeya@gmail.com>
 * @created 07/12/2018 NZDT
 */
const classes = require('extends-classes')
const axios = require('axios')

const {
    Condition,
    Info,
    LabTest,
    LookUp,
    Search,
    RiskFactor,
    Symptom,
    Suggest,
    Explain,
    Parse,
    Diagnosis,
    Triage
} = require('./lib')

const Classes = classes(
    Condition,
    Info,
    LabTest,
    LookUp,
    Search,
    RiskFactor,
    Symptom,
    Suggest,
    Explain,
    Parse,
    Diagnosis,
    Triage
)

class Infermedica extends Classes {
    constructor(options = {}) {
        const { appId, appKey } = options
        const host = 'https://api.infermedica.com/v2'
        axios.defaults.headers.common['app_id'] = appId
        axios.defaults.headers.common['app_key'] = appKey
        super({ host, axios })
        this.appId = appId
        this.appKey = appKey
    }

    /**
     * Gives context to methods called and thier parameters
     * @param {Object} method 
     * @param {Object} args
     * @throws {Error} throws an error if error occurs
     */
    __call(method, args) {
        console.log(`${method.toString()}(${args.toString() || ''}) is missing!`);
    }

    /**
     * Handles errors that occur while applicationnis running
     * @param {Object} err - An error object
     * @throws {Error} throws an error if error occurs
     */
    _handleError(err) {
        let errorCtx
        if (err.response) {
            const status = err.response.status
            switch (status) {
                case 400:
                    errorCtx = JSON.stringify({
                        statusText: err.response.statusText,
                        status,
                        message: `Request Error: invalid JSON (e.g. extra comma), missing or invalid parameter (e.g. missing fields in request body)`,
                        method: err.response.config.method.toUpperCase(),
                        url: err.response.config.url,
                        data: err.response.config.data || "",
                        stack: err.stack.toString()
                    }, null, 4)
                    break
                case 403:
                    errorCtx = JSON.stringify({
                        statusText: err.response.statusText,
                        status,
                        message: `Request Error: missing or invalid credentials for App-Id: ${this.appId} or App-Key: ${this.appKey}`,
                        method: err.response.config.method.toUpperCase(),
                        url: err.response.config.url,
                        data: err.response.config.data || "",
                        stack: err.stack.toString()
                    }, null, 4)
                    break
                case 404:
                    errorCtx = JSON.stringify({
                        statusText: err.response.statusText,
                        status,
                        message: `Request Error: invalid URL or object not found`,
                        method: err.response.config.method.toUpperCase(),
                        url: err.response.config.url,
                        data: err.response.config.data || "",
                        stack: err.stack.toString()
                    }, null, 4)
                    break
                case 405:
                    errorCtx = JSON.stringify({
                        statusText: err.response.statusText,
                        status,
                        message: `Request Error: invalid HTTP method (e.g. GET instead of POST)`,
                        method: err.response.config.method.toUpperCase(),
                        url: err.response.config.url,
                        data: err.response.config.data || "",
                        stack: err.stack.toString()
                    }, null, 4)
            }
        } else {
            errorCtx = err.stack.toString()
        }
        throw new Error(errorCtx)
    }
}

module.exports = Infermedica