feat(core): Alternative way of providing the license key

.prettierrc

@@ -0,0 +1,3 @@
+{
+  "singleQuote": true
+}

README.md

@@ -7,6 +7,18 @@ Maxmind's GeoLite2 Free Databases download helper.
 
 **IMPORTANT** You must setup `MAXMIND_LICENSE_KEY` environment variable be able to download databases. To do so, go to the https://www.maxmind.com/en/geolite2/signup, create a free account and generate new license key.
 
+If you don't have access to the environment variables during installation, you can provide license key via `package.json`:
+
+```json
+{
+  ...
+  "geolite2": {
+    "license-key": "<your license key>"
+  }
+  ...
+}
+```
+
 ```javascript
 var geolite2 = require('geolite2');
 var maxmind = require('maxmind');

scripts/postinstall.js

@@ -1,35 +1,43 @@
-const fs = require("fs");
-const https = require("https");
-const zlib = require("zlib");
-const path = require("path");
-const tar = require("tar");
+const fs = require('fs');
+const https = require('https');
+const zlib = require('zlib');
+const path = require('path');
+const tar = require('tar');
 
 let licenseKey = process.env.MAXMIND_LICENSE_KEY;
 if (!licenseKey) {
   try {
-    const packageJSONFilename = path.join(process.env["INIT_CWD"], "package.json");
-    const packageJSON = JSON.parse(fs.readFileSync(packageJSONFilename).toString());
-    licenseKey = packageJSON["node-geolite2"]["license-key"];
-  }
-  catch(e) {
-    console.error(`Error reading Maxmind license key from package.json: 
-    ${e.message}\n`);
+    const packageJsonFilename = path.join(
+      process.env['INIT_CWD'],
+      'package.json'
+    );
+    const packageJson = JSON.parse(
+      fs.readFileSync(packageJsonFilename, 'utf8')
+    );
+    licenseKey = packageJson['node-geolite2']['license-key'];
+  } catch (e) {
+    console.error("Error reading Maxmind license key from 'package.json'");
+    console.error(e.message);
   }
 }
 
 if (!licenseKey) {
   console.error(`Error: License key is not configured.\n
   You need to signup for a _free_ Maxmind account to get a license key.
   Go to https://www.maxmind.com/en/geolite2/signup, obtain your key and
-  put it in the MAXMIND_LICENSE_KEY environment variable
-  or in your package.json file (at the root level) like this:
-  "node-geolite2": {
+  put it in the MAXMIND_LICENSE_KEY environment variable.
+
+  If you don not have access to env vars, put this config in your package.json
+  file (at the root level) like this:
+
+  "geolite2": {
     "license-key": "<your license key>"
-  }\n`);
+  }
+`);
   process.exit(1);
 }
 
-const link = edition =>
+const link = (edition) =>
   `https://download.maxmind.com/app/geoip_download?edition_id=${edition}&license_key=${licenseKey}&suffix=tar.gz`;
 
 const links = [
@@ -38,25 +46,25 @@ const links = [
   link('GeoLite2-ASN'),
 ];
 
-const downloadPath = path.join(__dirname, "..", "dbs");
+const downloadPath = path.join(__dirname, '..', 'dbs');
 
 if (!fs.existsSync(downloadPath)) fs.mkdirSync(downloadPath);
 
-const download = url =>
-  new Promise(resolve => {
-    https.get(url, function(response) {
+const download = (url) =>
+  new Promise((resolve) => {
+    https.get(url, function (response) {
       resolve(response.pipe(zlib.createGunzip({})));
     });
   });
 
-console.log("Downloading maxmind databases...");
-links.forEach(url =>
-  download(url).then(result =>
-    result.pipe(tar.t()).on("entry", entry => {
-      if (entry.path.endsWith(".mmdb")) {
+console.log('Downloading maxmind databases...');
+links.forEach((url) =>
+  download(url).then((result) =>
+    result.pipe(tar.t()).on('entry', (entry) => {
+      if (entry.path.endsWith('.mmdb')) {
         const dstFilename = path.join(downloadPath, path.basename(entry.path));
         entry.pipe(fs.createWriteStream(dstFilename));
       }
     })
   )
-);
+);