README

A Laravel package that integrates with the Gmail API to seamlessly manage emails within your application. Built with Saloon PHP for API interactions and Laravel Data for structured data handling.

📋 Table of Contents

Features
Requirements
Installation
Google API Setup
Usage
Advanced Usage
Configuration
Events
Testing
Changelog
Contributing
Security
Credits
License

🚀 Features

OAuth Authentication: Seamless integration with Gmail's OAuth 2.0 flow
Email Operations:
- Read emails and threads with full content and attachments
- Send emails with HTML content
- Support for CC, BCC, and custom sender addresses
- Automatic contact parsing for CRM integration
Label Management:
- List, create, update, and delete email labels
- Organize emails with custom label hierarchies
Performance Optimizations:
- Batch statistics retrieval for multi-account dashboards
- Smart count estimation to prevent timeouts on large mailboxes
- Connection health monitoring with quota tracking
- Lazy loading collections for memory-efficient processing
- Pagination support for large datasets
- Customizable batch sizes for API requests
Developer Experience:
- Laravel facade for convenient access
- Strongly-typed data objects with Laravel Data
- Full Laravel service container integration
- Comprehensive exception handling
- Null-safe methods for robust applications (dashboards, background processing)
- Command-line testing utilities
Enterprise Architecture:
- Service layer with interface contracts for enhanced testability
- Builder pattern for fluent client construction
- Repository pattern for data access abstraction
- Factory pattern for centralized service management
- Type-safe configuration objects
- Comprehensive test data builders and mock factories

📋 Requirements

PHP 8.2 or higher
Laravel 10.x, 11.x, or 12.x
Google API credentials

📦 Installation

You can install the package via Composer:

composer require partridgerocks/gmail-client

After installation, publish the configuration file:

php artisan vendor:publish --tag="gmail-client-config"

This will create a config/gmail-client.php configuration file in your project.

🔐 Google API Setup

Before you can use the Gmail Client, you need to set up a project in the Google Developer Console and obtain OAuth 2.0 credentials:

Go to the Google Developer Console
Create a new project (or select an existing one)
Navigate to "APIs & Services" > "Library"
Search for and enable the "Gmail API"
Go to "APIs & Services" > "Credentials"
Click "Configure Consent Screen" and set up your OAuth consent screen:
- Select "External" or "Internal" user type (depending on your needs)
- Fill in the required app information
- Add the required scopes (see below)
- Add test users if needed (for external user type)
Create OAuth 2.0 credentials:
- Go to "Credentials" and click "Create Credentials" > "OAuth client ID"
- Select "Web application" as the application type
- Add a name for your client
- Add your authorized redirect URIs (this should match your GMAIL_REDIRECT_URI config value)
- Click "Create"
Copy the Client ID and Client Secret to your .env file:

GMAIL_CLIENT_ID=your-client-id
GMAIL_CLIENT_SECRET=your-client-secret
GMAIL_REDIRECT_URI=https://your-app.com/gmail/auth/callback
GMAIL_FROM_EMAIL=your-email@gmail.com

# Performance optimization settings
GMAIL_SMART_COUNTING=true
GMAIL_COUNT_THRESHOLD=50
GMAIL_CACHE_TTL=300
GMAIL_MAX_CONCURRENT=3
GMAIL_CIRCUIT_BREAKER=true
GMAIL_API_TIMEOUT=30

# Multi-account settings
GMAIL_MAX_ACCOUNTS=5
GMAIL_HEALTH_CHECK_INTERVAL=3600
GMAIL_BULK_OPERATIONS=true

Note: The Gmail API requires specific scopes to access different features. The default configuration includes commonly used scopes, but you can customize them in the config file.

🔍 Usage

The package automatically registers a Laravel Facade that provides a convenient way to interact with the Gmail API:

use PartridgeRocks\GmailClient\Facades\GmailClient;

// Get recent messages
$messages = GmailClient::listMessages();

// Get a specific message
$message = GmailClient::getMessage('message-id');

// Send an email
$email = GmailClient::sendEmail(
    'recipient@example.com',
    'Subject line',
    '<p>Email body in HTML format</p>'
);

Authentication

The Gmail Client provides two ways to authenticate with the Gmail API:

1. Manual Authentication Flow

If you want full control over the authentication process:

use PartridgeRocks\GmailClient\Facades\GmailClient;

// 1. Get the authorization URL
$authUrl = GmailClient::getAuthorizationUrl(
    config('gmail-client.redirect_uri'),
    config('gmail-client.scopes'),
    [
        'access_type' => 'offline',
        'prompt' => 'consent'
    ]
);

// 2. Redirect the user to the authorization URL
return redirect($authUrl);

// 3. In your callback route, exchange the code for tokens
public function handleCallback(Request $request)
{
    $code = $request->get('code');

    // Exchange code for tokens
    $tokens = GmailClient::exchangeCode(
        $code,
        config('gmail-client.redirect_uri')
    );

    // Store tokens securely for the authenticated user
    auth()->user()->update([
        'gmail_access_token' => $tokens['access_token'],
        'gmail_refresh_token' => $tokens['refresh_token'] ?? null,
        'gmail_token_expires_at' => now()->addSeconds($tokens['expires_in']),
    ]);

    return redirect()->route('dashboard');
}

2. Using Built-in Routes

For a simpler setup, you can enable the built-in routes:

Enable route registration in the config file:

// config/gmail-client.php
'register_routes' => true,

Use the provided routes in your app:

// Generate a link to the Gmail authentication page
<a href="{{ route('gmail.auth.redirect') }}">Connect Gmail</a>

The package will handle the OAuth flow and store the tokens in the session by default.

Working with Emails

Once authenticated, you can use the client to interact with Gmail:

List Messages

use PartridgeRocks\GmailClient\Facades\GmailClient;

// Authenticate with a stored token
GmailClient::authenticate($accessToken);

// List recent messages (returns a collection of Email data objects)
$messages = GmailClient::listMessages(['maxResults' => 10]);

foreach ($messages as $message) {
    echo "From: {$message->from}\n";
    echo "Subject: {$message->subject}\n";
    echo "Date: {$message->internalDate->format('Y-m-d H:i:s')}\n";
    echo "Body: {$message->body}\n";
}

// With query parameters (using Gmail search syntax)
$messages = GmailClient::listMessages([
    'q' => 'from:example@gmail.com after:2023/01/01 has:attachment',
    'maxResults' => 20
]);

Get a Specific Message

// Get a specific message by ID
$email = GmailClient::getMessage('message-id');

echo "Subject: {$email->subject}\n";
echo "From: {$email->from}\n";
echo "Snippet: {$email->snippet}\n";
echo "Body: {$email->body}\n";

// Access message headers
foreach ($email->headers as $name => $value) {
    echo "{$name}: {$value}\n";
}

// Check for specific labels
if (in_array('INBOX', $email->labelIds)) {
    echo "This message is in the inbox\n";
}

Send an Email

// Send a simple email
$email = GmailClient::sendEmail(
    'recipient@example.com',
    'Email subject',
    '<p>This is the email body in HTML format.</p>'
);

// Send with additional options
$email = GmailClient::sendEmail(
    'recipient@example.com',
    'Email with options',
    '<p>This email includes CC and BCC recipients.</p>',
    [
        'from' => 'your-email@gmail.com',
        'cc' => 'cc@example.com',
        'bcc' => 'bcc@example.com',
    ]
);

// The sent email object is returned
echo "Email sent with ID: {$email->id}";

Performance Features

Account Statistics (Batch Retrieval)

For multi-account dashboards, use the batch statistics method to minimize API calls:

// Get comprehensive account metrics in 1-2 API calls
$stats = GmailClient::getAccountStatistics([
    'unread_limit' => 25,        // Show exact count up to 25, then "25+"
    'today_limit' => 15,         // Today's messages limit  
    'include_labels' => true,    // Include label count
    'estimate_large_counts' => true,  // Use smart estimation
    'background_mode' => false,  // Throw exceptions or return partial data
]);

// Returns:
// [
//     'unread_count' => 23,           // or "25+" for large counts
//     'today_count' => 8,             // Today's messages
//     'labels_count' => 42,           // Total labels
//     'estimated_total' => 15000,     // Total mailbox size estimate
//     'api_calls_made' => 2,          // Actual API calls used
//     'last_updated' => '2024-01-01T12:00:00Z',
//     'partial_failure' => false,     // True if some metrics failed
// ]

// Performance comparison:
// Before: 3-5 API calls per account, 2-5s load time
// After:  1-2 API calls per account, <1s load time

Connection Health Monitoring

Monitor connection status and API quota:

$health = GmailClient::getAccountHealth();

// Returns:
// [
//     'connected' => true,
//     'status' => 'healthy',           // healthy, unhealthy, rate_limited, etc.
//     'api_quota_remaining' => 250,    // Remaining API calls (if available)
//     'last_successful_call' => '2024-01-01T12:00:00Z',
//     'errors' => [],                  // Array of error messages
// ]

// Use for dashboard health indicators
if ($health['status'] === 'rate_limited') {
    // Handle rate limiting gracefully
    $retryAfter = $health['retry_after'] ?? 60;
}

Contact Parsing & CRM Integration

The package automatically parses email addresses and names from Gmail messages, making it easy to integrate with CRM systems:

// Get an email message
$email = GmailClient::getMessage('message-id');

// Access parsed contact information
$sender = $email->fromContact;
echo "Sender: {$sender->name} <{$sender->email}>\n";
echo "Domain: {$sender->domain}\n";

// Access recipient contacts
foreach ($email->toContacts as $contact) {
    echo "To: {$contact->getDisplayName()} - {$contact->email}\n";
}

// Get all contacts involved in the email
$allContacts = $email->getAllContacts();

// Find contacts from specific domain (useful for CRM)
$externalContacts = array_filter(
    $allContacts,
    fn($contact) => !$contact->isFromDomain('mycompany.com')
);

// Get unique domains for company identification
$domains = $email->getContactDomains();
// Returns: ['example.com', 'client.com', 'mycompany.com']

// Check if email involves specific company
if ($email->hasContactFromDomain('important-client.com')) {
    // Handle VIP client email
}

// Get all contacts from a domain
$clientContacts = $email->getContactsFromDomain('acme-corp.com');

Manual Contact Parsing

You can also parse email strings manually:

use PartridgeRocks\GmailClient\Data\Contact;

// Parse single email address
$contact = Contact::parse('"John Doe" <john@example.com>');
echo $contact->name;    // "John Doe"  
echo $contact->email;   // "john@example.com"
echo $contact->domain;  // "example.com"

// Parse multiple addresses
$contacts = Contact::parseMultiple('john@example.com, "Jane Doe" <jane@example.com>');

// Access contact properties
foreach ($contacts as $contact) {
    echo "Name: " . ($contact->name ?? 'No name') . "\n";
    echo "Email: {$contact->email}\n";
    echo "Domain: {$contact->domain}\n";
    echo "Local part: {$contact->getLocalPart()}\n";
    echo "Display name: {$contact->getDisplayName()}\n";
    echo "Formatted: {$contact->format()}\n";
}

CRM Integration Examples

// Find all emails from a specific company
$companyEmails = collect($emails)->filter(function ($email) {
    return $email->hasContactFromDomain('target-company.com');
});

// Extract contact data for CRM import
$crmData = [];
foreach ($emails as $email) {
    foreach ($email->getAllContacts() as $contact) {
        if (!$contact->isFromDomain('mycompany.com')) {
            $crmData[] = [
                'name' => $contact->name,
                'email' => $contact->email,
                'company_domain' => $contact->domain,
                'first_contact' => $email->internalDate,
            ];
        }
    }
}

// Group contacts by company domain
$contactsByCompany = collect($emails)
    ->flatMap(fn($email) => $email->getAllContacts())
    ->groupBy('domain')
    ->map(fn($contacts) => $contacts->unique('email'));

Working with Labels

Gmail uses labels to organize emails. You can create, retrieve, and manage these labels:

// List all labels
$labels = GmailClient::listLabels();

foreach ($labels as $label) {
    echo "Label: {$label->name} (ID: {$label->id})\n";
    echo "Type: {$label->type}\n";
    
    if ($label->messagesTotal !== null) {
        echo "Messages: {$label->messagesTotal} ({$label->messagesUnread} unread)\n";
    }
}

// Get a specific label
$label = GmailClient::getLabel('label-id');

// Create a new label
$newLabel = GmailClient::createLabel('Important Clients', [
    'labelListVisibility' => 'labelShow',
    'messageListVisibility' => 'show',
    'color' => [
        'backgroundColor' => '#16a765',
        'textColor' => '#ffffff'
    ]
]);

// Update a label (using the LabelResource directly)
$updatedLabel = GmailClient::labels()->update($label->id, [
    'name' => 'VIP Clients',
    'color' => [
        'backgroundColor' => '#4986e7',
        'textColor' => '#ffffff'
    ]
]);

// Delete a label
GmailClient::labels()->delete($label->id);

Using Without Facade

If you prefer not to use the facade, you can resolve the client from the container:

use PartridgeRocks\GmailClient\GmailClient;

public function index(GmailClient $gmailClient)
{
    $gmailClient->authenticate($accessToken);
    $messages = $gmailClient->listMessages();
    
    // ...
}

Builder Pattern & Service Integration

For advanced usage with dependency injection and configuration:

use PartridgeRocks\GmailClient\Builders\GmailClientBuilder;
use PartridgeRocks\GmailClient\Contracts\MessageServiceInterface;

// Using builder pattern
$client = GmailClientBuilder::create()
    ->withToken($accessToken)
    ->withConfig($customConfig)
    ->build();

// Using service injection
class EmailController extends Controller
{
    public function __construct(private MessageServiceInterface $messageService) {}
    
    public function dashboard()
    {
        $recentMessages = $this->messageService->findRecent(10);
        return view('dashboard', compact('recentMessages'));
    }
}

Integration with Your User Model

Here's an example of how you might integrate the Gmail client with your User model:

// In your User model
public function connectGmail($accessToken, $refreshToken = null, $expiresAt = null)
{
    $this->gmail_access_token = $accessToken;
    $this->gmail_refresh_token = $refreshToken;
    $this->gmail_token_expires_at = $expiresAt;
    $this->save();
}

public function getGmailClient()
{
    if (empty($this->gmail_access_token)) {
        throw new \Exception('Gmail not connected');
    }
    
    return app(GmailClient::class)->authenticate(
        $this->gmail_access_token,
        $this->gmail_refresh_token,
        $this->gmail_token_expires_at ? new \DateTime($this->gmail_token_expires_at) : null
    );
}

// In your controller
public function listEmails()
{
    $gmailClient = auth()->user()->getGmailClient();
    return $gmailClient->listMessages(['maxResults' => 20]);
}

🔧 Advanced Usage

Pagination Support

The package supports pagination for listing messages and labels:

// Get a paginator for messages
$paginator = GmailClient::listMessages(['maxResults' => 25], true);

// Get the first page
$firstPage = $paginator->getNextPage();

// Check if there are more pages
if ($paginator->hasMorePages()) {
    // Get the next page
    $secondPage = $paginator->getNextPage();
}

// Or get all pages at once (use cautiously with large datasets)
$allMessages = $paginator->getAllPages();

// You can also transform the results using the DTO
use PartridgeRocks\GmailClient\Data\Responses\EmailDTO;
$emails = $paginator->transformUsingDTO(EmailDTO::class);

Memory Efficiency

When working with large Gmail accounts, it's important to avoid loading all messages into memory at once:

// Lazy loading is the most memory-efficient approach for large datasets
$messages = GmailClient::listMessages(lazy: true);

// Process messages one by one without loading everything into memory
foreach ($messages as $message) {
    processMessage($message);
    
    // You can stop iteration at any point
    if ($someCondition) {
        break;
    }
}

// For even more efficiency, you can get only message IDs without full details
$messageIds = GmailClient::listMessages(lazy: true, fullDetails: false);

foreach ($messageIds as $messageData) {
    echo "Message ID: {$messageData['id']}\n";
    
    // Load full details only for specific messages if needed
    if (needsFullDetails($messageData)) {
        $fullMessage = GmailClient::getMessage($messageData['id']);
    }
}

Null-Safe Methods for Robust Applications

For applications that need graceful degradation (dashboards, background processing), use the null-safe methods that never throw exceptions:

// ✅ Safe for dashboards - returns empty collection on any error
$labels = GmailClient::safeListLabels();
$messages = GmailClient::safeListMessages(['q' => 'is:unread']);

// ✅ Returns null instead of throwing NotFoundException
$message = GmailClient::safeGetMessage('message-id');

// ✅ Connection health check - never throws exceptions
if (GmailClient::isConnected()) {
    // Safe to proceed with Gmail operations
}

// ✅ Account overview with fallback data
$summary = GmailClient::getAccountSummary();
// Returns: ['connected' => true, 'labels_count' => 15, 'has_unread' => true, 'errors' => []]

// ✅ Statistics with graceful degradation
$stats = GmailClient::safeGetAccountStatistics();
// Returns fallback data if API fails: ['unread_count' => '?', 'partial_failure' => true]

Perfect for:

Dashboard widgets that should never crash
Background sync processes
Health monitoring systems
Any UI requiring robust error handling

Enhanced Error Handling

The package provides detailed error handling for common Gmail API errors:

use PartridgeRocks\GmailClient\Exceptions\AuthenticationException;
use PartridgeRocks\GmailClient\Exceptions\NotFoundException;
use PartridgeRocks\GmailClient\Exceptions\RateLimitException;
use PartridgeRocks\GmailClient\Exceptions\ValidationException;

try {
    $message = GmailClient::getMessage('non-existent-id');
} catch (NotFoundException $e) {
    // Handle not found error
    echo "Message not found: " . $e->getMessage();
} catch (AuthenticationException $e) {
    // Handle authentication errors
    echo "Authentication error: " . $e->getMessage();

    if ($e->getError()->code === 'token_expired') {
        // Refresh the token
        $tokens = GmailClient::refreshToken($refreshToken);
    }
} catch (RateLimitException $e) {
    // Handle rate limit errors
    $retryAfter = $e->getRetryAfter();
    echo "Rate limit exceeded. Retry after {$retryAfter} seconds.";
} catch (ValidationException $e) {
    // Handle validation errors
    echo "Validation error: " . $e->getMessage();
}

Refresh a Token

// Refresh an expired token
$tokens = GmailClient::refreshToken($refreshToken);

// The client is automatically authenticated with the new token
// Update the tokens in your storage
$user->update([
    'gmail_access_token' => $tokens['access_token'],
    'gmail_refresh_token' => $tokens['refresh_token'] ?? $user->gmail_refresh_token,
    'gmail_token_expires_at' => now()->addSeconds($tokens['expires_in']),
]);

Command Line Testing

The package includes a command to test your Gmail API connection:

# Get authentication URL
php artisan gmail-client:test --authenticate

# List recent messages
php artisan gmail-client:test --list-messages

# List labels
php artisan gmail-client:test --list-labels

Custom Email Templates

You can use your own branded email templates:

// config/gmail-client.php
'branded_template' => resource_path('views/emails/branded-template.blade.php'),

⚙️ Configuration

The package configuration file (config/gmail-client.php) provides extensive customization options:

Performance Settings

'performance' => [
    'enable_smart_counting' => true,           // Enable smart count estimation
    'count_estimation_threshold' => 50,        // Show exact count up to this limit
    'default_cache_ttl' => 300,               // Cache TTL in seconds (future use)
    'max_concurrent_requests' => 3,           // Max concurrent API requests (future use)
    'enable_circuit_breaker' => true,         // Enable circuit breaker pattern (future use)
    'api_timeout' => 30,                      // API request timeout in seconds
],

Multi-Account Settings

'multi_account' => [
    'max_accounts_per_user' => 5,             // Maximum Gmail accounts per user
    'health_check_interval' => 3600,          // Health check interval in seconds
    'enable_bulk_operations' => true,         // Enable bulk operations (future use)
],

Environment Variables

All configuration options can be overridden via environment variables:

Variable	Default	Description
`GMAIL_SMART_COUNTING`	`true`	Enable smart count estimation
`GMAIL_COUNT_THRESHOLD`	`50`	Threshold for showing exact vs estimated counts
`GMAIL_CACHE_TTL`	`300`	Cache time-to-live in seconds
`GMAIL_MAX_CONCURRENT`	`3`	Maximum concurrent requests
`GMAIL_CIRCUIT_BREAKER`	`true`	Enable circuit breaker pattern
`GMAIL_API_TIMEOUT`	`30`	API request timeout in seconds
`GMAIL_MAX_ACCOUNTS`	`5`	Maximum accounts per user
`GMAIL_HEALTH_CHECK_INTERVAL`	`3600`	Health check interval in seconds
`GMAIL_BULK_OPERATIONS`	`true`	Enable bulk operations

📡 Events

The package dispatches events that you can listen for:

GmailAccessTokenRefreshed: When a token is refreshed
GmailMessageSent: When an email is sent

🧪 Testing

The package includes tests that you can run with PHPUnit:

composer test

For testing in your own application, you can use Saloon's built-in mocking capabilities:

use Saloon\Laravel\Facades\Saloon;
use Saloon\Http\Faking\MockResponse;

// In your test setup
public function setUp(): void
{
    parent::setUp();
    
    // Mock all Gmail API responses
    Saloon::fake([
        '*gmail.googleapis.com*' => MockResponse::make([
            'messages' => [
                [
                    'id' => 'test-id-123',
                    'threadId' => 'thread-123',
                    'snippet' => 'This is a test email',
                ]
            ]
        ], 200),
    ]);
}

📝 Changelog

Please see CHANGELOG for more information on what has changed recently.

🤝 Contributing

Please see CONTRIBUTING for details.

🔒 Security Vulnerabilities

Please review our security policy on how to report security vulnerabilities.

👨‍💻 Credits

📄 License

The MIT License (MIT). Please see License File for more information.

partridgerocks/gmail-client

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