Add newsletter management functionality

lib/Exceptions/EbookParsingException.php

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+<?
+namespace Exceptions;
+
+class EbookParsingException extends SeException{
+}

lib/Exceptions/InvalidAuthorException.php

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+<?
+namespace Exceptions;
+
+class InvalidAuthorException extends SeException{
+}

lib/Exceptions/InvalidCaptchaException.php

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+<?
+namespace Exceptions;
+
+class InvalidCaptchaException extends SeException{
+	protected $message = 'We couldn’t validate your CAPTCHA response.';
+}

lib/Exceptions/InvalidCollectionException.php

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+<?
+namespace Exceptions;
+
+class InvalidCollectionException extends SeException{
+}

lib/Exceptions/InvalidCredentialsException.php

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+<?
+namespace Exceptions;
+
+class InvalidCredentialsException extends SeException{
+	protected $message = 'Invalid credentials.';
+}

lib/Exceptions/InvalidEbookException.php

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+<?
+namespace Exceptions;
+
+class InvalidEbookException extends SeException{
+}

lib/Exceptions/InvalidEmailException.php

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+<?
+namespace Exceptions;
+
+class InvalidEmailException extends SeException{
+	protected $message = 'We couldn’t understand your email address.';
+}

lib/Exceptions/InvalidNewsletterSubscriberException.php

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+<?
+namespace Exceptions;
+
+class InvalidNewsletterSubscriberException extends SeException{
+	protected $message = 'We couldn’t find you in our newsletter subscribers list.';
+}

lib/Exceptions/InvalidRequestException.php

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+<?
+namespace Exceptions;
+
+class InvalidRequestException extends SeException{
+	protected $message = 'Invalid request.';
+}

lib/Exceptions/NewsletterRequiredException.php

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+<?
+namespace Exceptions;
+
+class NewsletterRequiredException extends SeException{
+	protected $message = 'You must select at least one newsletter to subscribe to.';
+}

lib/Exceptions/NewsletterSubscriberExistsException.php

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+<?
+namespace Exceptions;
+
+class NewsletterSubscriberExistsException extends SeException{
+	protected $message = 'You’re already subscribed to the newsletter.';
+}

lib/Exceptions/NoopException.php

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+<?
+namespace Exceptions;
+
+class NoopException extends SeException{
+}

lib/Exceptions/SeException.php

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+<?
+namespace Exceptions;
+
+class SeException extends \Exception{
+}

lib/Exceptions/SeeOtherEbookException.php

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+<?
+namespace Exceptions;
+
+class SeeOtherEbookException extends SeException{
+	public $Url;
+
+	public function __construct(string $url = ''){
+		$this->Url = $url;
+		parent::__construct('This ebook is at a different URL: ' . $url);
+	}
+}

lib/Exceptions/ValidationException.php

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+<?
+namespace Exceptions;
+
+use function Safe\json_encode;
+
+class ValidationException extends SeException{
+	public $Exceptions = [];
+	public $HasExceptions = false;
+	public $IsFatal = false;
+
+	public function __toString(): string{
+		$output = '';
+		foreach($this->Exceptions as $exception){
+			$output .= $exception->getMessage() . '; ';
+		}
+
+		return rtrim($output, '; ');
+	}
+
+	public function Add(\Exception $exception, bool $isFatal = false): void{
+		if(is_a($exception, static::class)){
+			foreach($exception->Exceptions as $childException){
+				$this->Add($childException);
+			}
+		}
+		else{
+			$this->Exceptions[] = $exception;
+		}
+
+		if($isFatal){
+			$this->IsFatal = true;
+		}
+
+		$this->HasExceptions = true;
+	}
+
+	public function Serialize(): string{
+		$val = '';
+		foreach($this->Exceptions as $childException){
+			$val .= $childException->getCode() . ',';
+		}
+
+		$val = rtrim($val, ',');
+
+		return $val;
+	}
+
+	public function Has(string $exception): bool{
+		foreach($this->Exceptions as $childException){
+			if(is_a($childException, $exception)){
+				return true;
+			}
+		}
+
+		return false;
+	}
+
+	public function Clear(): void{
+		unset($this->Exceptions);
+		$this->Exceptions = [];
+		$this->HasExceptions = false;
+	}
+}

lib/Exceptions/WebhookException.php

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+<?
+namespace Exceptions;
+
+class WebhookException extends SeException{
+	public $PostData;
+
+	public function __construct(string $message = '', string $data = null){
+		$this->PostData = $data;
+		parent::__construct($message);
+	}
+}