Laravel inbox

Purpose of this package is to provide pattern-matching for incoming communication and executing custom callbacks if they match.

Credits to BeyondCode for the initial codebase. The idea for this package later on substantially diverged from the original, leaving no alternative than to separate it as a new package.

Installation

Require the package with composer require asseco-voice/laravel-inbox. Service provider will be registered automatically.

Usage

Interface

Before you start using the package, you need to have a class implementing a CanMatch interface so that package knows what will it validate regex against.

I.e. if you want to validate against 'from', you need to defined where to fetch that piece of information from.

class Message implements CanMatch
{
    ...
    public function getMatchedValues(string $matchBy): array
    {
        switch ($matchBy) {
            case 'from':                return [$this->from()];
            case 'subject':             return [$this->subject()];
            case 'something_custom':    return [$this->custom()];
            default:                    return [];
        }
    }
    ...
}

Inbox API

Inbox is a class in which you provide regex patterns which you'd like to be matched before the given callback is executed.

I.e. the callback defined under action() will execute only if the .*@gmail.com pattern is matched:

$inbox = new Inbox();

$inbox
    ->from('{.*}@gmail.com')
    ->action(function (CanMatch $message) {
        Log::info("Message received");
    });

Patterns need to be surrounded within { }.

• from($pattern) will target from field

• to($pattern) will target to field

• cc($pattern) will target cc field

• bcc($pattern) will target bcc field

• subject($pattern) will target subject field

• setPattern($name, $pattern) is created for every other use case you might need. I.e. from($pattern) is just a shorthand for setPattern('from', $pattern).

• meta([...]) for adding any other meta-data.

• action(callable) is a callback to be executed and takes object implementing a CanMatch interface as an only argument (can be omitted though).

• matchEither() will act as OR gate in case more than one pattern is defined. Default behavior is to match all patterns for a callback to execute.

• priority($number) will set inbox priority which will be taken into account only if InboxGroup is used.

• run(CanMatch $message) will take an instance of object implementing CanMatch interface and will return a bool of whether the inbox was hit or not. This method must not be used when using inbox groups. They have their own run() method.

Inbox group API

Should you require multiple cases covered, there is also a higher level concept - InboxGroup which acts as a container for multiple inboxes, having a few fluent API methods as well.

• add(Inbox $inbox) will add an inbox to a group
• continuousMatching() will continue matching after a first match is hit. Default behavior is to stop after one inbox is matched.
• fallback(callable) will add a (non-mandatory) fallback which will execute if no inbox is hit.
• run(CanMatch $message) will take an instance of object implementing CanMatch interface and will (unlike inbox run() method) return an array of matched inboxes. Inboxes will be ran by priority.

More examples

Examples will cover cases using mail, but it can be adapted to any incoming communication.

Matching functions can be used to either provide an exact match (i.e. from('[email protected]')) or providing a regex match which needs to be surrounded with curly braces { } to be interpreted as such.

Example:

$inbox = new Inbox();

$inbox
    ->from('{.*}@gmail.com')
    ->to('{.*}@gmail.com')
    ->subject('Subject to match')
    ->action(function (CanMatch $email) {
        Log::info("Mail received");
    })
    ->matchEither()
    ->priority(10);

More examples with outcomes:

• having an exact match from('[email protected]'):
  • only mails coming solely from [email protected] will be matched.
• having a partial match from('{.*}@gmail.com'):
  • any gmail address will be matched like [email protected] and [email protected] will be matched, but [email protected] won't).
• having a partial match from('your.name@{.*}'):
  • same as last example, but this time the name is fixed and provider is flexible. It would match [email protected], [email protected], but it wouldn't match [email protected].
• having a full regex match: from('{.*}'):
  • accepts anything.

Group example:

public function receiveEmail($email){

    $inbox1 = ...;
    $inbox2 = ...;
    $inbox3 = ...;

    $group = new InboxGroup(); 
    
    $group
        ->add($inbox1)
        ->add($inbox2)
        ->add($inbox3) 
        ->fallback(function (CanMatch $email) {
            Log::info("Fell back");
        })
        ->continuousMatching()
        ->run($email);
}

If you don't want to use groups, but a single inbox, you can call run method on it directly:

public function receiveEmail($email){

    $inbox = new Inbox();
    
    $inbox
        ->...
        ->...
        ->run($email);
}