Ben Dodson

Freelance iOS, macOS, Apple Watch, and Apple TV Developer

MailRoute blacklisting via email

I’ve been using MailRoute on and off for the past few years1 in an effort to reduce the amount of spam in my inbox but there is one missing feature that always drives me nuts; there is no way to blacklist an email address or domain without going to their website. Whilst you can whitelist domains easily from the daily digest of caught spam, there is no feature that lets you forward spam to them in order to have it blacklisted (despite people, including me, requesting it since 2013). After having a look at the MailRoute API, I decided it was time to fix this myself.

There are several components in getting this working.

  1. I created a new email address with Gmail which will catch my forwarded spam2.
  2. I set up an account with and connected it to the gmail account3.
  3. I put the following code available on GitHub on a 15 minute CRON job

require_once 'OAuth.php';

define('CONTEXT_KEY', 'your-contextio-consumer-key');
define('CONTEXT_SECRET', 'your-contextio-consumer-secret');
define('CONTEXT_USER_ID', 'your-contextio-user-id');
define('CONTEXT_TRASH_NAME', '[Gmail]/Trash'); // change if not using Gmail

define('MAILROUTE_USER', 'your-mailroute-username'); // should be your email address
define('MAILROUTE_API_KEY', 'your-mailroute-api-key');
define('MAILROUTE_EMAIL_ACCOUNT_ID', 'your-mailroute-email-id'); // numeric - can be found in network traffic

$whitelist = ['']; // add the email address you are forwarding from or you'll blacklist yourself...

$inbox = performOAuthRequest('GET', ''.CONTEXT_USER_ID.'/email_accounts/0/folders/inbox/messages');
foreach ($inbox as $message) {
    $id = $message->{'message_id'};
    $body = performOAuthRequest('GET', ''.CONTEXT_USER_ID.'/email_accounts/0/folders/inbox/messages/'.$id.'/body');
    $content = str_replace('<', '', str_replace('>', '', $body->bodies[0]->content));
    $emails = extractEmailAddresses($content);
    foreach ($emails as $email) {
        if (!in_array($email, $whitelist)) {
            performRequest('POST', '', ['email_account' => '/api/v1/email_account/'.MAILROUTE_EMAIL_ACCOUNT_ID.'/', 'email' => $email, 'wb' => 'b'], ['Authorization: ApiKey '.MAILROUTE_USER.':'.MAILROUTE_API_KEY]);
    performOAuthRequest('PUT', ''.CONTEXT_USER_ID.'/email_accounts/0/folders/inbox/messages/'.$id, ['new_folder_id' => CONTEXT_TRASH_NAME]);

echo 'DONE!';


function performOAuthRequest($httpMethod, $url, $params=[], $headers=[]) {
    $signatureMethod = new OAuthSignatureMethod_HMAC_SHA1();
    $oauthConsumer = new OAuthConsumer(CONTEXT_KEY, CONTEXT_SECRET, NULL);
    $oauthRequest = OAuthRequest::from_consumer_and_token($oauthConsumer, NULL, $httpMethod, $url, $params);
    $oauthRequest->sign_request($signatureMethod, $oauthConsumer, NULL);
    return performRequest($httpMethod, $oauthRequest, $params);

function performRequest($httpMethod, $url, $params=[], $headers=[]) {
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_TIMEOUT, 20);

    $headers[] = 'Content-Type: application/json';
    curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);

    if (!in_array($httpMethod, ['GET', 'POST'])) {
        curl_setopt($ch, CURLOPT_CUSTOMREQUEST, $httpMethod);
    if ($httpMethod != 'GET') {
        curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($params));
    $output = curl_exec($ch);
    $httpcode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    return json_decode($output);

// Email parsing

function extractEmailAddresses($string) {
   $emails = array();
   $string = str_replace("\r\n",' ',$string);
   $string = str_replace("\n",' ',$string);

   foreach(preg_split('/ /', $string) as $token) {
        $email = filter_var($token, FILTER_VALIDATE_EMAIL);
        if ($email !== false) { 
            $emails[] = $email;
    return array_unique($emails);

Now all you need to do is forward any spam you receive to the Gmail account you set up. Every 15 minutes, the CRON job will run and check the inbox for any emails. When it finds some, it will parse them for email addresses and blacklist them with MailRoute before deleting them.

In an ideal world, MailRoute would implement a custom email address for blacklisting but this seems to be working for now.

  1. I stopped using MailRoute a while back and was using the black hole feature of Sanebox but I’ve just stopped using them as found the free service FollowUpThen - I was getting a lot of spam after the switch off so decided to re-activate MailRoute this week. I use Fastmail for my email in case you were wondering. ↩︎

  2. As you’ll be forwarding emails to Gmail, you’ll want to disable its spam filter as otherwise your emails won’t end up in the inbox for processing by Context. To do this, you’ll need to set up a new rule which matches the email ‘@’ and ensures it never goes to spam. ↩︎

  3. Whilst I could connect Context to my personal email and just move things into a folder for blacklisting, I don’t trust services with access to my email account, certainly not services that are free and are using the data. ↩︎

Pocket Rocket for iOS 10 (now with an iMessage app)

To coincide with the release of iOS 10, I’m happy to announce a free update is available for my app Pocket Rocket which includes several new features:

First of all, I’ve added an optional tile-based interface which uses an image from the article or a random colour if one isn’t available. You can long press a tile to get options for sharing, archiving, and deleting the article and tapping will open the article up in Safari or the in-app browser as per your settings. Next, I added the ability to share articles directly from Pocket Rocket; whether you are using the old list view or the new tile-based one, just long press on an article and you’ll be given a share option which uses the standard iOS share sheet so you can transfer the URL to any compatible app.

Finally, I added an iOS 10 iMessage app so you can share articles directly within iMessage:

This was a really interesting feature for me as it let me get to grips with the new APIs that allow apps to hook into iMessage. There are a few interesting niggles for developers when writing these apps1 but on the whole it is fairly simple and includes a lot more power than I thought they would2. With Pocket Rocket, you get a list of all of your articles; you can then tap to include them in your message and send them. Once received, you can tap to have the article open up in a webview directly within iMessage.

I think iMessage apps are going to be a huge deal so I’m excited that Pocket Rocket is one of the first apps available on the iMessage store.

You can get Pocket Rocket for free on the App Store. If you have any feature requests or feedback, please get in touch.

  1. For example, there is no standard way of seeing when someone tapped a link which is… irritating. Instead you have to work out if a particular message is selected (which happens for a variety of reasons) and then be clever about what you present. ↩︎

  2. I’ve seen one app that lets you use the camera within iMessage - pretty cool! ↩︎

Generating a random colour, with a seed, in Swift 3

I’ve been working on some iOS 10 updates to Pocket Rocket1 which led me to trying to solve an interesting problem; how do you generate a random colour, with a seed, in Swift? The reason for this dilemma is that I’m going to start showing a grid view of Pocket articles and many of them do not have images associated with them. In order to break things up, I decided I’d like a random colour for the background of each article:

As each article is UICollectionViewCell, setting a random background colour is not suitable as when you scroll and the cells are re-used the backgrounds will change. Whilst that could be fixed fairly easily, I also want the colours to persist with the article between app launches and also be the same in the iPad app and the iMessage extension. This means I need to generate a random colour with a seed so that colours generated with the same seed will always be the same.

Thankfully this is fairly easy if we use the srand48 and drand48 functions:

func randomColor(seed: String) -> UIColor {
    var total: Int = 0
    for u in seed.unicodeScalars {
        total += Int(UInt32(u))
    srand48(total * 200)
    let r = CGFloat(drand48())
    let g = CGFloat(drand48())
    srand48(total / 200)
    let b = CGFloat(drand48())
    return UIColor(red: r, green: g, blue: b, alpha: 1)

We start by taking a string (in my case an article title) and turning it into an integer by getting the sum of the unicode scalar values of each character. Next, we seed the drand48 function by using srand48 with our Int along with a multiplier or division so that the red, green, and blue values are all different. Finally, we compile the UIColor together.

I’ve put together a Swift Playground demonstrating this using the last few headlines from Daring Fireball:

As you can see, each article title results in a different colour; the same string will always result in the same colour being generated. Be aware that this is not collision free as it is just a basic addition of scalar values – a string such as “ben” and “neb” will result in the same colours. This isn’t an issue for my usage and still serves as an interesting way of seeding random colours.

  1. Specifically an iMessage app↩︎

Tips for Remote Working

I was recently asked by to contribute to a feature asking several successful remote workers to share their favourite tips and tools to sustain productivity when working remotely. You can read the full article on their website but I’ve also put their questions and my answers below:

How long have you worked remotely?

Around 6 years

What does a typical day look like for you?

I’ll wake up and go and deal with my dogs first thing around 6.30am whilst getting breakfast ready for my wife. Once she has left, I’ll read and deal with any overnight emails before doing a concentrated burst of work until around 1pm. After lunch, I’ll typically go for a walk and do a bit more work before playing some video games on my PC before my wife gets home. We’ll then walk the dogs, cook some dinner, and generally watch TV. Once she falls asleep, I’ll either do some more work or play some video games depending on how busy my schedule is.

What’s the one tip or tool you’d give to anyone looking to get started remote working to keep productive?

Develop a schedule and stick to it. The hardest thing in the world is finding the motivation to start on a new project but once you’ve done 10 minutes of work you’ll be raring to go on the next 10 minutes and the next. To work remotely, you need the self-control to work when you don’t want to, the passion in your work to keep going, and the common sense to know when a 30 minute break is going to actually help rather than hinder you.

With regards to tools, I can strongly recommend Cushion as an incredible way of managing your schedule, invoices, and expenses; it’ll make sure you don’t get overbooked (a big no-no) and also help you manage your finances better.

Brapp: Summer Updates

Over the summer, I’ve continued working with Brapp on 3 big releases which added several new features and UI updates.


Released in July, Brapp 2.1 added the ability to trim recorded videos and change vibrancy of video filters along with adding a load of speed and stability improvements. However, the big new feature allowed users to export their beats as a video complete with an animating waveform:

This was a really interesting feature for me to build as I wasn’t sure initially how it would work. It turns out that it is actually fairly easy by adding your animations directly to the various CALayers and then using an AVVideoCompositionCoreAnimationTool as your AVMutableVideoComposition animation tool. Fun stuff!


Released just a few days later, Brapp 2.1.1 included the ability to pin your favourite beat or post to the top of your profile feed1 and added a “Now Playing” bar along the bottom of the app with a similar style to Apple Music. It also introduced synchornicity between the website and app for notifications which is an interesting problem to solve; basically, if someone reads the notifications on the website, a silent push needs to be sent to the app in order to remove the badge icon so you don’t think you have new notifications. There were also some pretty meaty performance upgrades behind the scenes.


Brapp 2.2 was released today with the headline feature of location support. One of my main interests with iOS apps has always been in geo-location so it was really fun for me to add these new features including the ability to tag specific locations to beats and videos, add a city or town to your profile, view beats and videos on a profile map, and search for beats and videos either near you or at a specific location.

Once again, Brapp has been a really fun project to work on. I can’t say enough good things about the people behind it and am looking forward to working with them again in the future. If you haven’t checked it out yet, you can get Brapp for free on the App Store. You can also read about the initial build and release, the v1.1 update last November, and the v2 update earlier this year.

  1. This feature was added by David Gibson↩︎

Moonlight tvOS for Apple TV 4

A few nights ago I was attempting to finish playing Day of the Tentacle on my PC via a Steam Link in my bedroom. For some reason, whilst it all loaded correctly, it was really jerky to play with a severe delay between controller input and response on the screen. As I’d been playing it successfully using GameStream on my Nvidia Shield, I assumed correctly that the issue was with the Steam Link.

Not content to have to either a) go downstairs and use the Nvidia Shield or b) go to my office and play in front of my PC, I instead turned to my Apple TV as I knew there was an open source project called Moonlight that basically lets you run the GameStream technology on non-Nvidia devices like iPhone or iPad. I assumed there would be a version for Apple TV but unfortunately it turns out that the AVFoundation frameworks have a __TVOS_PROHIBITED flag on some key components that prevent it from working. That’s when I found a fork by kevsmithpublic that enabled tvOS support with some code changes and requiring you to remove the __TVOS_PROHIBITED flags from the AVFoundation framework1. Unfortunately, I wasn’t able to get it to pair to my PC and after a lot of searching it turns out that the fork was fairly old and hadn’t been updated to the latest specifications for GeForce Experience 3.0 and above.

Determined not to be beaten, I forked the project and then set about updating the code to support the latest Moonlight connections. This ended up being similar to the point and click adventure I was trying to play as I needed to constantly fetch the Apple TV from my bedroom, connect it to my mac, build the project, unplug the Apple TV, reconnect it in my bedroom, and then test if it actually worked (all because I didn’t have a spare monitor in my office as I use an iMac). After several hours (and a few beers) I had the project working and can now stream my games at 1080p from my PC to my Apple TV 4 and play them using an MFI controller.

You can download the project from my GitHub account.

  1. This means it can’t ever be used in an App Store version but it’s pretty cool nonetheless. I had no idea you could alter framework headers to enable things like this. It does beg the question why this framework is prohibited as it all clearly works. ↩︎

The Divide #15 - Virtually Reality

After a short summer break we’re back with episode 15 of The Divide podcast which is all about virtual reality. John has a fancy new HTC Vive, I’m trying to convince myself I don’t need one, and Chris just wants to be on the bridge with Captain Janeway…

You can get The Divide from these fine outlets:

Don’t forget to leave a review on iTunes and follow us on Twitter via @PodcastDivide.

Media Library privacy flaw fixed in iOS 10

As I’ve mentioned many times before, iOS had a pretty terrible privacy flaw in that apps didn’t need any permissions in order to read through your media library. This was an issue as it meant you could be fingerprinted easily and tracked across various apps1. Thankfully, this has now been fixed in iOS 102.

In this article, I’ll explain how to update your apps to support this new privacy requirement. Before I do that, I’m going to show you what happens if you run an app built against the iOS 9.3 SDK (or earlier) on iOS 10:

[app name] would like to access Apple Music

You’ll be prompted3 to allow permissions as soon as any media library code is encountered be that on app startup or in a background process such as that used by Music Tracker. If you decline to give permission then the app will quit to the home screen and you will not be able to use it. This is a big change from previous permission switches whereby apps built against the old SDK would be exempt from new permissions (i.e. if your iOS 7 SDK compiled app ran on iOS 8, it wouldn’t crash because it wasn’t using the new location privacy options). Personally I like this change as it allows you to see clearly which apps were abusing these APIs such as Canary and Google Calendar.

Bottom line: If you are using MPMediaQuery or similar in your app, you’d better update it with the iOS 10 SDK as soon as possible as otherwise you are going to get a lot of crashes if your users don’t allow the permission (or a lot of awkward questions if you shouldn’t be using this API).

How do you update your app to request permission for these APIs? First of all, lets whip up a basic example with Swift 3 that will pull the title of the first track in your music library:

@IBAction func buttonPressed(_ sender: AnyObject) {
    let query = MPMediaQuery.songs()
    if let items = query.items, let item = items.first {
        NSLog("Title: \(item.title)")

In keeping with other permissions based APIs such as photos, contacts, and calendars, iOS 10 requires that you add a new key to your Info.plist file to explain why you want to use this permission; for music library access, this key is NSAppleMusicUsageDescription. If you don’t add this key, your app will crash as soon as you try and access an MPMediaQuery with the following message:

This app has crashed because it attempted to access privacy-sensitive data without a usage description. The app’s Info.plist must contain an NSAppleMusicUsageDescription key with a string value explaining to the user how the app uses this data.

With the NSAppleMusicUsageDescription key in place, you will now be given a standard permission dialogue when you first try and access the users media library. If the user chooses “Don’t Allow”, then the media query will fail and any subsequent calls will request in the query.items property being nil. If they choose “OK”, then nothing happens (as execution of the code is not suspended and there is no callback). To fix this, we need to use the MPMediaLibrary.authorizationStatus() and requestAuthorization((MPMediaLibraryAuthorizationStatus) -> Void) APIs that were added in iOS 9.3 to do something like this:

@IBAction func buttonPressed(_ sender: AnyObject) {
    MPMediaLibrary.requestAuthorization { (status) in
        if status == .authorized {
        } else {

func runMediaLibraryQuery() {
    let query = MPMediaQuery.songs()
    if let items = query.items, let item = items.first {
        NSLog("Title: \(item.title)")

func displayMediaLibraryError() {
    var error: String
    switch MPMediaLibrary.authorizationStatus() {
    case .restricted:
        error = "Media library access restricted by corporate or parental settings"
    case .denied:
        error = "Media library access denied by user"
        error = "Unknown error"
    let controller = UIAlertController(title: "Error", message: error, preferredStyle: .alert)
    controller.addAction(UIAlertAction(title: "OK", style: .default, handler: nil))
    present(controller, animated: true, completion: nil)

You first need to request authorization and then run your code only if the status is authorized. If not, then you should display an error specific to whether or not the request was denied or restricted (usually by corporate or parental controls).

I’ve put an example project on GitHub which uses the code above by way of demonstration.

I’m extremely grateful to everyone that has helped share my posts about this issue and to the engineers at Apple for fixing this privacy flaw. I’ll update this post should anything change between now and the expected public release of iOS 10 in September.

  1. Whilst I had no concrete proof of this at the time of writing those articles, it looks like I was right that this was a widespread problem↩︎

  2. I don’t want to take all the credit for this but I honestly don’t think this would have been fixed if I hadn’t raised the issue repeatedly over the last 7 months. ↩︎

  3. In earlier builds of iOS 10 you’d be asked “[App Name] Would Like to Access Apple Music” (as shown in screenshots above) but as of iOS 10 beta 4 this has been changed to the more appropriate “[App Name] Would Like to Access Apple Music and Your Media Library”. ↩︎

Talking Shop with Ben Dodson

I was recently interviewed by the lovely folks at Cushion1 as part of their Talking Shop series about my life as a freelancer. You can read the full interview on their website but I’ve also put their questions and my answers below:

How did you get your start?

I started off strictly as a web developer, moving from agency to agency, not really enjoying what I was doing. At the same time, Apple had just released the iPhone and, shortly afterwards, the App Store. I thought iOS development looked fun, so I quit my job and started teaching myself how to do it.

Where did your first clients come from?

I had been freelancing as a web developer on the side for a number of years, so I had a few clients through that. Coincidentally, when I decided to freelance full-time, a friend from Twitter reached out and asked if I would be interested in appearing on The Gadget Show. For the segment the show wanted a freelance developer and a small company to build two separate apps, then see which was more popular. At the time, I had never built an app, so naturally, I said yes. It forced me to learn the ropes pretty quickly! I cobbled this app together and it ended up doing really well, scoring a feature from the App Store. From there, clients just kept coming.

What type of projects do you work on now?

Now there’s also the iPad, Apple Watch, Apple TV, so I work on a variety of projects — everything from little apps to find the best steak restaurant nearby to bigger ones for clients like L’Oreal and Glenfiddich.

What does your day-to-day look like?

At this point, I try to exclusively work from home. In the beginning, clients would insist on coming to their office. Those days would always be spent in meetings, talking about nothing, and not getting much done. Nowadays, I push for a video call in lieu of all that. I have clients I’ve never even spoken to, that I work with via email or Slack. They’re the best.

What has been the greatest challenge of kind of being a freelancer?

For me, it’s been time management. It’s so easy to procrastinate. Then you hit a deadline and realize that you’ve done nothing, you have to tell the client, but you don’t want to tell the client, so things get worse quickly. The biggest challenge for me was getting to a point where I can switch my work mode on and off.

What’s next for you?

A few years ago, I had my own app, an iPhone game called WallaBee. For about three and a half years, I focused on that and was extremely adamant about not hiring anyone else. In retrospect, some help might have made sense, but I was worried about being able to pay someone reliably month to month. It was a lot of fun, but eventually, I burned out and sold it.

Ultimately, I’d like to do something like that again, but at the moment, I enjoy freelancing.

It’s a constant battle between doing things that you want to do, but not earning any money, and doing the things that are less enjoyable, but make money.

I’m sure that statement resonates with a lot of freelancers.

When I was young and single, it was easy to spend twenty hours a day working on my pet project for no pay. The money earned mattered less because at the end of the day, it was just me. But when you have a family with mouths to feed and bills to pay, you find yourself taking less of those risks and opting for projects that provide a bit more security.

What advice would you give to someone just starting out?

Keep it simple. I spent a long time researching and reading up on various how-to-get-things-done philosophies, buying every to-do list manager there was. Now I just have a basic list, make my own invoices, and track everything else in Cushion. If you spend a fortune on loads of tools and to-do lists and all that, you end up spending more time tweaking your setup for productivity than actually being productive.

  1. If you’re a freelancer, you should definitely check out Cushion. It’s an awesome online tool for keeping track of your clients and scheduling - I’ve been using it for nearly a year and it has helped me avoid overbooking myself. I’m super excited for their invoicing tools which they are launching soon. ↩︎

Creating passwordless user accounts within iOS apps

I’m currently in the process of writing an app which will store some information for each user on a server; the stored data should be available to the user on all of their devices. Usually there are two ways of dealing with this:

  1. Build a user access system such that the user has to register to use the service. They’ll need to log in to the app (usually with email address and password) on each of their devices.

  2. Use CloudKit to store all of the information in an Apple provided database.

The first option is overkill for this fairly simple app1 and the second is too restrictive as it means I need to use Apple’s specific data modelling system. However, there is a third way which uses a bit of each of them…

When a user is logged in to an Apple account on their device2, they are automatically signed into the iCloud system. With CloudKit, every app gets its own identifier based on both the CloudKit container and user account which doesn’t change. By retrieving this identifier, you can be 100% sure of the user that is using your app without knowing anything personal about them and without requiring them to manually log into your app.

To get the identifier, you first need to enable CloudKit within the iCloud section of the Capabilities panel in Xcode (which will require updating your provisioning profile). Then, it is a simple case of importing the CloudKit framework and using the following code:

let container = CKContainer.defaultContainer()
container.fetchUserRecordIDWithCompletionHandler { (recordID, error) in
    guard let recordID = recordID else {
        NSLog("Error: \(error")
    NSLog("Identifier: \(recordID.recordName)")    

The identifier returned will be 34 characters long and look something like this:


Once you have that, you can then send it to your server to match it against whatever content you want to link to this particular user. Now whenever they use your app on any device with the same Apple account, they’ll have access to everything without the need for a manual account creation process and without having to hand over any personal information. The entire process is completely silent and is very secure as the identifier is generated from both the Apple account and your CloudKit container - it can’t be used by other apps nor can it be reverse-engineered to give you personal details of the user.

I find the code above a bit messy to be used multiple times throughout an application (not to mention the import CloudKit requirement) and so I’ve wrapped this up in a very basic Swift class that can be called as such:

AppleCloudIdentifier.fetch { (identifier, error) in
    guard let identifier = identifier else {
        NSLog("Error: \(error)")
    NSLog("Cloud identifier: \(identifier)")

I’ve named it AppleCloudIdentifier and the code is available on GitHub.

UPDATE [3rd May 2019]: I needed use of this in a recent project and so I’ve updated the code to make use of Swift 5 and the new Result type.

  1. It’ll also lead to a sharp drop-off in users as people don’t like having to create multiple accounts all over the place. You could implement something like Facebook Login but then you still have an issue in that you are requiring a fair amount of personal information upfront which you probably don’t need. ↩︎

  2. I’ll hazard a guess that 99.9% of iOS devices are logged into an Apple account. They need to be in order to download apps, send iMessages, create backups, etc, so very unlikely you wouldn’t be. ↩︎

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