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Serverless Geolocation Service
/*
* Serverless Geolocation Service, hosted on Cloudflare Workers.
*
* Learn more at https://maxkostinevich.com/blog/serverless-geolocation
*
* (c) Max Kostinevich / https://maxkostinevich.com
*/
// https://gist.github.com/maephisto/9228207
const isoCountries = {
'AF' : 'Afghanistan',
'AX' : 'Aland Islands',
'AL' : 'Albania',
'DZ' : 'Algeria',
'AS' : 'American Samoa',
'AD' : 'Andorra',
'AO' : 'Angola',
'AI' : 'Anguilla',
'AQ' : 'Antarctica',
'AG' : 'Antigua And Barbuda',
'AR' : 'Argentina',
'AM' : 'Armenia',
'AW' : 'Aruba',
'AU' : 'Australia',
'AT' : 'Austria',
'AZ' : 'Azerbaijan',
'BS' : 'Bahamas',
'BH' : 'Bahrain',
'BD' : 'Bangladesh',
'BB' : 'Barbados',
'BY' : 'Belarus',
'BE' : 'Belgium',
'BZ' : 'Belize',
'BJ' : 'Benin',
'BM' : 'Bermuda',
'BT' : 'Bhutan',
'BO' : 'Bolivia',
'BA' : 'Bosnia And Herzegovina',
'BW' : 'Botswana',
'BV' : 'Bouvet Island',
'BR' : 'Brazil',
'IO' : 'British Indian Ocean Territory',
'BN' : 'Brunei Darussalam',
'BG' : 'Bulgaria',
'BF' : 'Burkina Faso',
'BI' : 'Burundi',
'KH' : 'Cambodia',
'CM' : 'Cameroon',
'CA' : 'Canada',
'CV' : 'Cape Verde',
'KY' : 'Cayman Islands',
'CF' : 'Central African Republic',
'TD' : 'Chad',
'CL' : 'Chile',
'CN' : 'China',
'CX' : 'Christmas Island',
'CC' : 'Cocos (Keeling) Islands',
'CO' : 'Colombia',
'KM' : 'Comoros',
'CG' : 'Congo',
'CD' : 'Congo, Democratic Republic',
'CK' : 'Cook Islands',
'CR' : 'Costa Rica',
'CI' : 'Cote D\'Ivoire',
'HR' : 'Croatia',
'CU' : 'Cuba',
'CY' : 'Cyprus',
'CZ' : 'Czech Republic',
'DK' : 'Denmark',
'DJ' : 'Djibouti',
'DM' : 'Dominica',
'DO' : 'Dominican Republic',
'EC' : 'Ecuador',
'EG' : 'Egypt',
'SV' : 'El Salvador',
'GQ' : 'Equatorial Guinea',
'ER' : 'Eritrea',
'EE' : 'Estonia',
'ET' : 'Ethiopia',
'FK' : 'Falkland Islands (Malvinas)',
'FO' : 'Faroe Islands',
'FJ' : 'Fiji',
'FI' : 'Finland',
'FR' : 'France',
'GF' : 'French Guiana',
'PF' : 'French Polynesia',
'TF' : 'French Southern Territories',
'GA' : 'Gabon',
'GM' : 'Gambia',
'GE' : 'Georgia',
'DE' : 'Germany',
'GH' : 'Ghana',
'GI' : 'Gibraltar',
'GR' : 'Greece',
'GL' : 'Greenland',
'GD' : 'Grenada',
'GP' : 'Guadeloupe',
'GU' : 'Guam',
'GT' : 'Guatemala',
'GG' : 'Guernsey',
'GN' : 'Guinea',
'GW' : 'Guinea-Bissau',
'GY' : 'Guyana',
'HT' : 'Haiti',
'HM' : 'Heard Island & Mcdonald Islands',
'VA' : 'Holy See (Vatican City State)',
'HN' : 'Honduras',
'HK' : 'Hong Kong',
'HU' : 'Hungary',
'IS' : 'Iceland',
'IN' : 'India',
'ID' : 'Indonesia',
'IR' : 'Iran, Islamic Republic Of',
'IQ' : 'Iraq',
'IE' : 'Ireland',
'IM' : 'Isle Of Man',
'IL' : 'Israel',
'IT' : 'Italy',
'JM' : 'Jamaica',
'JP' : 'Japan',
'JE' : 'Jersey',
'JO' : 'Jordan',
'KZ' : 'Kazakhstan',
'KE' : 'Kenya',
'KI' : 'Kiribati',
'KR' : 'Korea',
'KW' : 'Kuwait',
'KG' : 'Kyrgyzstan',
'LA' : 'Lao People\'s Democratic Republic',
'LV' : 'Latvia',
'LB' : 'Lebanon',
'LS' : 'Lesotho',
'LR' : 'Liberia',
'LY' : 'Libyan Arab Jamahiriya',
'LI' : 'Liechtenstein',
'LT' : 'Lithuania',
'LU' : 'Luxembourg',
'MO' : 'Macao',
'MK' : 'Macedonia',
'MG' : 'Madagascar',
'MW' : 'Malawi',
'MY' : 'Malaysia',
'MV' : 'Maldives',
'ML' : 'Mali',
'MT' : 'Malta',
'MH' : 'Marshall Islands',
'MQ' : 'Martinique',
'MR' : 'Mauritania',
'MU' : 'Mauritius',
'YT' : 'Mayotte',
'MX' : 'Mexico',
'FM' : 'Micronesia, Federated States Of',
'MD' : 'Moldova',
'MC' : 'Monaco',
'MN' : 'Mongolia',
'ME' : 'Montenegro',
'MS' : 'Montserrat',
'MA' : 'Morocco',
'MZ' : 'Mozambique',
'MM' : 'Myanmar',
'NA' : 'Namibia',
'NR' : 'Nauru',
'NP' : 'Nepal',
'NL' : 'Netherlands',
'AN' : 'Netherlands Antilles',
'NC' : 'New Caledonia',
'NZ' : 'New Zealand',
'NI' : 'Nicaragua',
'NE' : 'Niger',
'NG' : 'Nigeria',
'NU' : 'Niue',
'NF' : 'Norfolk Island',
'MP' : 'Northern Mariana Islands',
'NO' : 'Norway',
'OM' : 'Oman',
'PK' : 'Pakistan',
'PW' : 'Palau',
'PS' : 'Palestinian Territory, Occupied',
'PA' : 'Panama',
'PG' : 'Papua New Guinea',
'PY' : 'Paraguay',
'PE' : 'Peru',
'PH' : 'Philippines',
'PN' : 'Pitcairn',
'PL' : 'Poland',
'PT' : 'Portugal',
'PR' : 'Puerto Rico',
'QA' : 'Qatar',
'RE' : 'Reunion',
'RO' : 'Romania',
'RU' : 'Russian Federation',
'RW' : 'Rwanda',
'BL' : 'Saint Barthelemy',
'SH' : 'Saint Helena',
'KN' : 'Saint Kitts And Nevis',
'LC' : 'Saint Lucia',
'MF' : 'Saint Martin',
'PM' : 'Saint Pierre And Miquelon',
'VC' : 'Saint Vincent And Grenadines',
'WS' : 'Samoa',
'SM' : 'San Marino',
'ST' : 'Sao Tome And Principe',
'SA' : 'Saudi Arabia',
'SN' : 'Senegal',
'RS' : 'Serbia',
'SC' : 'Seychelles',
'SL' : 'Sierra Leone',
'SG' : 'Singapore',
'SK' : 'Slovakia',
'SI' : 'Slovenia',
'SB' : 'Solomon Islands',
'SO' : 'Somalia',
'ZA' : 'South Africa',
'GS' : 'South Georgia And Sandwich Isl.',
'ES' : 'Spain',
'LK' : 'Sri Lanka',
'SD' : 'Sudan',
'SR' : 'Suriname',
'SJ' : 'Svalbard And Jan Mayen',
'SZ' : 'Swaziland',
'SE' : 'Sweden',
'CH' : 'Switzerland',
'SY' : 'Syrian Arab Republic',
'TW' : 'Taiwan',
'TJ' : 'Tajikistan',
'TZ' : 'Tanzania',
'TH' : 'Thailand',
'TL' : 'Timor-Leste',
'TG' : 'Togo',
'TK' : 'Tokelau',
'TO' : 'Tonga',
'TT' : 'Trinidad And Tobago',
'TN' : 'Tunisia',
'TR' : 'Turkey',
'TM' : 'Turkmenistan',
'TC' : 'Turks And Caicos Islands',
'TV' : 'Tuvalu',
'UG' : 'Uganda',
'UA' : 'Ukraine',
'AE' : 'United Arab Emirates',
'GB' : 'United Kingdom',
'US' : 'United States',
'UM' : 'United States Outlying Islands',
'UY' : 'Uruguay',
'UZ' : 'Uzbekistan',
'VU' : 'Vanuatu',
'VE' : 'Venezuela',
'VN' : 'Viet Nam',
'VG' : 'Virgin Islands, British',
'VI' : 'Virgin Islands, U.S.',
'WF' : 'Wallis And Futuna',
'EH' : 'Western Sahara',
'YE' : 'Yemen',
'ZM' : 'Zambia',
'ZW' : 'Zimbabwe'
};
// Helper functions
const getCountryName = (countryCode) => {
if (isoCountries.hasOwnProperty(countryCode)) {
return isoCountries[countryCode];
} else {
return countryCode;
}
}
const isString = (str) => {
if (typeof str === 'string') {
return true;
}
return false;
}
// Helper function to return JSON response
const JSONResponse = (message, status = 200) => {
let headers = {
headers: {
"content-type": "application/json;charset=UTF-8",
"Access-Control-Allow-Origin": "*",
"Access-Control-Allow-Methods": "GET, HEAD, POST, OPTIONS",
"Access-Control-Allow-Headers": "Content-Type"
},
status: status
};
let response = {
message: ''
};
if(!isString(message)){
response = message;
}else{
response = {
message: message
};
}
return new Response(JSON.stringify(response), headers);
};
addEventListener("fetch", event => {
const request = event.request;
if (request.method === "OPTIONS") {
event.respondWith(handleOptions(request));
}else{
event.respondWith(handle(request));
}
});
const corsHeaders = {
"Access-Control-Allow-Origin": "*",
"Access-Control-Allow-Methods": "GET, HEAD, POST, OPTIONS",
"Access-Control-Allow-Headers": "Content-Type"
};
function handleOptions(request) {
if (
request.headers.get("Origin") !== null &&
request.headers.get("Access-Control-Request-Method") !== null &&
request.headers.get("Access-Control-Request-Headers") !== null
) {
// Handle CORS pre-flight request.
return new Response(null, {
headers: corsHeaders
});
} else {
// Handle standard OPTIONS request.
return new Response(null, {
headers: {
Allow: "GET, HEAD, POST, OPTIONS"
}
});
}
}
async function handle(request) {
try {
const ip = request.headers.get('cf-connecting-ip');
const countryCode = request.cf.country;
if (countryCode === "") {
return JSONResponse("Invalid request", 500);
}
try {
const country = getCountryName(countryCode);
return JSONResponse({message: 'success', ip, country: {code: countryCode, name: country}});
} catch (err) {
console.log("Error");
console.log(err);
return JSONResponse("Oops! Something went wrong.", 500);
}
} catch (err) {
console.log(err);
return JSONResponse("Oops! Something went wrong.", 500);
}
}
@batisteo

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@batisteo batisteo commented Jul 28, 2020

I'm not an expert at all, is it a JS idiom?

const isString = (str) => {
    if (typeof str === 'string') {
        return true;
    }
    return false;
}

Could it be written?:

const isString = (str) => typeof str === 'string';
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