The latest articles on DEV Community by Dimitar Nestorov (@dimitarnestorov). https://dev.to/dimitarnestorov https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F22711%2F728a6a75-e6cb-4cb6-957e-e5973fe7407e.jpg https://dev.to/dimitarnestorov en Dimitar Nestorov Sat, 31 Mar 2018 03:25:47 +0000 https://dev.to/dimitarnestorov/are-there-any-good-tutorials-for-react-native-for-experienced-react-developers-fl2 https://dev.to/dimitarnestorov/are-there-any-good-tutorials-for-react-native-for-experienced-react-developers-fl2 <p>Hey guys, I'm about to start working on a React Native project, and for the last 9 months I have been using React on the web and I kinda want to skip the learning React and JavaScript part and jump right on the React Native specifics. Can you recommend me good tutorials that are made for established web/React developers?</p> <p>I would also love if you have links to some expert/hardcore React Native tutorials so that I can go deeper into the matter later on.</p> <p>Thanks in advance!</p> discuss javascript react reactnative Dimitar Nestorov Sat, 12 Aug 2017 00:01:40 +0000 https://dev.to/dimitarnestorov/invisible-recaptcha-on-mobile https://dev.to/dimitarnestorov/invisible-recaptcha-on-mobile <p>To prevent brute force on our login/register forms we've implemented Google's <a href="https://developers.google.com/recaptcha/docs/invisible">invisible reCAPTCHA</a> on our website. However we can't present a mobile user with this on the app we're developing. So I was wondering is there a simple and protected way to login a user into our app?</p> <p>Now the first things that come to mind would be to implement a mobile login/register endpoint, but an attacker would easily get this endpoint and start brute forcing it.</p> <p>The next thing that I came up would be to ask the API for a token and use that to login the user, however this would mean to to block an IP address after X failed attempts, and it starts to feel like we're going to be developing our own version of CAPTCHA.</p> <p>And another one would be to create something similar to OAuth, but UX would suffer because the user would have to be presented a web page and from time to time he might see a CAPTCHA.</p> <p>Do you have any ideas for a simple implementation which would prevent an attacker from brute forcing the app?</p> <p>For now the second method seems the most reasonable. I've stumbled upon websites before which give like 10 attempts to login with an X email address and then block that user from logging in for a while.</p> <p><iframe width="710" height="399" src="https://www.youtube.com/embed/hdJ7PTdPaqc"> </iframe> </p> <p>As much as I remember this video used to have this form submitted once before and reCAPTCHA didn't show up. I can only guess that part got trimmed. Seems like reCAPTCHA decides when to "test" the users by simply comparing timestamps.</p> <p>P.S. I can't think of a title which does not seem like click bait 😅</p> discuss bruteforce security Dimitar Nestorov Sun, 06 Aug 2017 20:40:50 +0000 https://dev.to/dimitarnestorov/how-to-store-an-email-archive https://dev.to/dimitarnestorov/how-to-store-an-email-archive <p>I am going to be developing an application which stores emails but I'm wondering what would be the best way to store them?</p> <p>I would like to be able to search through them which makes storing them in separate files very inefficient. So I was wondering which DB is the best for this solution.</p> <p>SQL? NoSQL?<br> PostgreSQL? MongoDB?</p> <p>What do you think?</p> discuss question Dimitar Nestorov Sat, 08 Jul 2017 21:49:49 +0000 https://dev.to/dimitarnestorov/could-you-not-finally https://dev.to/dimitarnestorov/could-you-not-finally <p>Do you know of any way to skip the execution of a <code>finally</code> block?<br> </p> <div class="highlight js-code-highlight"> <pre class="highlight javascript"><code><span class="kd">function</span> <span class="nx">fn</span><span class="p">(){</span> <span class="k">try</span><span class="p">{</span> <span class="k">return</span> <span class="mi">1</span><span class="p">;</span> <span class="p">}</span><span class="k">finally</span><span class="p">{</span> <span class="nx">console</span><span class="p">.</span><span class="nx">log</span><span class="p">(</span><span class="mi">2</span><span class="p">);</span> <span class="p">}</span> <span class="p">}</span> <span class="nx">fn</span><span class="p">();</span> <span class="c1">// Logs 2</span> <span class="c1">// Returns 1</span> </code></pre> </div> <p>A bit more bizarre example would be if you use <code>return</code> in <code>finally</code>:<br> </p> <div class="highlight js-code-highlight"> <pre class="highlight javascript"><code><span class="kd">function</span> <span class="nx">fn</span><span class="p">(){</span> <span class="k">try</span><span class="p">{</span> <span class="k">return</span> <span class="mi">1</span><span class="p">;</span> <span class="p">}</span><span class="k">finally</span><span class="p">{</span> <span class="k">return</span> <span class="mi">2</span><span class="p">;</span> <span class="p">}</span> <span class="p">}</span> <span class="nx">fn</span><span class="p">();</span> <span class="c1">// 2</span> </code></pre> </div> <p>It seems like finally cannot be stopped!</p> javascript discuss Dimitar Nestorov Wed, 21 Jun 2017 16:17:54 +0000 https://dev.to/dimitarnestorov/did-you-know-javascript-has-labels-since-es3 https://dev.to/dimitarnestorov/did-you-know-javascript-has-labels-since-es3 <p><a href="https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Statements/label" rel="noopener noreferrer">label - JavaScript MDN</a></p> <p>Essentially it is something like <em>goto</em> but only for loops and labeled blocks.</p> <p><a href="https://media.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fthepracticaldev.s3.amazonaws.com%2Fi%2F2fz3eq68f9ft0pr461cv.png" class="article-body-image-wrapper"><img src="https://media.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fthepracticaldev.s3.amazonaws.com%2Fi%2F2fz3eq68f9ft0pr461cv.png" alt="js label"></a></p> <p>I'm curious to see what's the worst example you can think of using labels?</p> <p>Or is there by any chance a very useful way to use them?</p> <p>The possibilities are endless!</p> discuss javascript syntax