README

A minimal PHP Postmark SDK that enables you to send single and batched email through the PostmarkApp.com service.

• Design
• Install
• Creating Mailings
  • Simple Mail
  • Tags and Metadata
  • File Attachments
  • Postmark Templates
  • Named Parameters
• Sending Mailings
  • The Postmark API
  • Single Mailing
  • Batch Mailing
• Development
  • Running the Tests
  • The Virtual Machine

Design

To maintain reliability, some objects are used for data (such as email and metadata) so that they can ensure that either the data conforms to specification or the developer is made aware of it as quickly as possible.

Install

$ composer require shawnmccool/minimal-php-postmark-sdk

Creating Mailings

The Mailing class represents a single instance that will be sent to a single recipient.

Simple Mail

To, from, subject, and body.

<?php

use MinimalPhpPostmarkSdk\{Mailing, Email};

new Mailing(
    'from name',
    Email::fromString('from@email.com'),
    Email::fromString('to@email.com'),
    'subject line',
    'email body'
);

Tags and Metadata

Configure message tags and metadata for link each mailing to entities, events, etc.

<?php

use MinimalPhpPostmarkSdk\{Mailing, Email};

new Mailing(
    'from name',
    Email::fromString('from@email.com'),
    Email::fromString('to@email.com'),
    'subject line',
    'email body',
    [],
    'holiday-sales-campaign',
    [
        'user_id' => 1,
        'description' => 'this information may be maximum 80 characters'
    ]
);

File Attachments

Multiple files can be attached.

<?php

use MinimalPhpPostmarkSdk\{Mailing, Email, Attachment};

new Mailing(
    'from name',
    Email::fromString('from@email.com'),
    Email::fromString('to@email.com'),
    'subject line',
    'email body',
    [
        new Attachment(
            'filename.pdf',
            'application/pdf',
            file_get_contents('local.pdf')
        )
    ]
);

Postmark Templates

Instead of specifying a subject line and html body you can use the Postmark template feature. Build the template in the Postmark user interface and specify either its id or alias in the mailing.

<?php

use MinimalPhpPostmarkSdk\{Mailing, Email};

new Mailing(
    'from name',
    Email::fromString('from@email.com'),
    Email::fromString('to@email.com'),
    null, null, [], '', [],
    'postmark template alias'
);

or

<?php

use MinimalPhpPostmarkSdk\{Mailing, Email};

new Mailing(
    'from name',
    Email::fromString('from@email.com'),
    Email::fromString('to@email.com'),
    null, null, [], '', [], '',
    'template id'
);

Postmark templates allow for variables. Create a template model to fill those variables.

<?php

use MinimalPhpPostmarkSdk\{Mailing, Email};

new Mailing(
    'from name',
    Email::fromString('from@email.com'),
    Email::fromString('to@email.com'),
    null, null, [], '', [], '',
    'template id',
    [
        'customer_name' => 'Roger',
        'product_name' => 'A really fun gift.'
    ]
);

Named Parameters

There's a number of options when creating a mailing. It could be possible to make a more rich and complex object model to reduce the need for optional constructor arguments. But in the name of simplicity and the fact that the class is feature complete we're going to leave it how it is.

If you don't like the empty arguments you can create a wrapper class, or you might prefer to use named parameters.

<?php

use MinimalPhpPostmarkSdk\{Mailing, Email};

new Mailing(
    fromName: 'from name',
    fromEmail: Email::fromString('from@email.com'),
    toEmail: Email::fromString('to@email.com'),
    templateId: 'template id',
    templateModel: [
        'customer_name' => 'Roger',
        'product_name' => 'A really fun gift.'
    ]
);

Sending Mailings

The Postmark API

You'll need a server token from postmark.

The PostmarkApi class handles interactions with the Postmark API.

<?php

use MinimalPhpPostmarkSdk\PostmarkApi;

$postmark = new PostmarkApi('server token');

Single Mailing

Sending a single mail is different from sending a batch. The response is an instance of SuccessResponse or ErrorResponse.

use MinimalPhpPostmarkSdk\{ErrorResponse,PostmarkApi,Mailing,Email,SuccessResponse};

$mailing = new Mailing(
    'from name',
    Email::fromString('from@email.com'),
    Email::fromString('to@email.com'),
    null, null, [], '', [], '',
    'template id'
);

$response = (new PostmarkApi('server token'))->single($mailing);

echo match (get_class($response)) {
    SuccessResponse::class => "Successfully sent message {$response->messageId()}.",
    ErrorResponse::class => "Could not send message. {$response->errorMessage()}",
};

Batch Mailing

A batched mailing is an array of mailings that will be sent to the Postmark api in chunks. This prevents new connections to the api being made for each and every mailing. By default the batch mailing will send chunks of 500 mailings at once; but this can be configured.

use MinimalPhpPostmarkSdk\{PostmarkApi,Mailing,Email};

$mailings = [
    new Mailing(
        'from name',
        Email::fromString('from@email.com'),
        Email::fromString('to@email.com'),
        null, null, [], '', [], '',
        'template id'
    ),
    new Mailing(
        'from name',
        Email::fromString('from@email.com'),
        Email::fromString('to@email.com'),
        null, null, [], '', [], '',
        'template id'
    )
];

# to send a batch with default settings
(new PostmarkApi('server token'))->batch($mailings);

# manually specify chunk size {how many mailings to send in one call)
(new PostmarkApi('server token'))->batch($mailings, 100);

Development

Development can be done on any machine running at least PHP 8.0. Set up the machine yourself or use the virtual-machine provided.

Running the Tests

The idea here is to test everything that doesn't have side effects against the Postmark API.

$ bin/phpunit

The Virtual Machine

The virtual machine may help if you don't have PHP 8.0 on your computer or if you want to avoid some kind of versioning collision etc. This will create an emulated server inside your computer that is configured for development of this package.

For the most part this should not be necessary.

Install modern versions of the following on your computer.

• Git — Download
• Vagrant — Download
• VirtualBox - Download

Run the following in the repository's directory.

$ git submodule update --init virtual-machine
$ vagrant up

The virtual machine will initialize. Afterwards enter the virtual machine and run the tests to validate the setup.

$ vagrant ssh

Welcome to Ubuntu 18.04 LTS (GNU/Linux 4.15.0-20-generic x86_64)

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Last login: Sat Dec 26 16:29:42 2020 from 10.0.2.2
minimal-php-postmark-sdk :: /vagrant $ bin/phpunit