Initial commit

Author: regnerisch

.gitignore

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+tests/
+vendor/
+.php-cs-fixer.cache
+.php-cs-fixer.php

.php-cs-fixer.dist.php

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+<?php
+
+$finder = PhpCsFixer\Finder::create()
+    ->in([
+        __DIR__ . '/src',
+        __DIR__ . '/tests'
+    ]);
+
+$config = new PhpCsFixer\Config();
+return $config->setRules([
+    '@Symfony' => true,
+    'concat_space' => [
+        'spacing' => 'one'
+    ],
+    'multiline_whitespace_before_semicolons' => [
+        'strategy' => 'no_multi_line'
+    ]
+])->setFinder($finder);

composer.json

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+{
+    "name": "espresso-tutorials/epub-to-html-converter",
+    "type": "library",
+    "license": "ISC",
+    "autoload": {
+        "psr-4": {
+            "EspressoTutorials\\Epub\\": "src/"
+        }
+    },
+    "authors": [
+        {
+            "name": "Jonas Regner",
+            "email": "[email protected]"
+        }
+    ],
+    "require": {
+        "ext-zip": "*",
+        "ext-simplexml": "*"
+    }
+}

src/Container.php

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+<?php
+
+namespace EspressoTutorials\Epub;
+
+use EspressoTutorials\Epub\Elements\RootFile;
+
+class Container
+{
+    protected ?RootFile $rootFile = null;
+
+    public function __construct(
+        protected SimpleXMLElement $element,
+    ) {
+    }
+
+    public function rootFile(): RootFile
+    {
+        if ($this->rootFile) {
+            return $this->rootFile;
+        }
+
+        return $this->rootFile = new RootFile(
+            (string) $this->element->rootfiles->rootfile->attributes()['full-path']
+        );
+    }
+}

src/Content.php

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+<?php
+
+namespace EspressoTutorials\Epub;
+
+use EspressoTutorials\Epub\Elements\Item;
+use EspressoTutorials\Epub\Elements\ItemRef;
+
+class Content
+{
+    protected array $manifest = [];
+
+    protected array $spine = [];
+
+    public function __construct(
+        protected SimpleXMLElement $element
+    ) {
+    }
+
+    public function manifest(): array
+    {
+        if ($this->manifest) {
+            return $this->manifest;
+        }
+
+        foreach ($this->element->manifest->item as $node) {
+            $this->manifest[] = new Item(
+                (string) $node->attributes()['id'],
+                (string) $node->attributes()['href'],
+                (string) $node->attributes()['media-type'],
+            );
+        }
+
+        return $this->manifest;
+    }
+
+    public function spine(): array
+    {
+        if ($this->spine) {
+            return $this->spine;
+        }
+
+        foreach ($this->element->spine->itemref as $node) {
+            $this->spine[] = new ItemRef(
+                (string) $node->attributes()['idref'],
+            );
+        }
+
+        return $this->spine;
+    }
+}

src/Elements/Item.php

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+<?php
+
+namespace EspressoTutorials\Epub\Elements;
+
+class Item
+{
+    public function __construct(
+        protected string $id,
+        protected string $path,
+        protected string $mimetype
+    ) {
+    }
+
+    public function id(): string
+    {
+        return $this->id;
+    }
+
+    public function path(): string
+    {
+        return $this->path;
+    }
+
+    public function mimeType(): string
+    {
+        return $this->mimetype;
+    }
+}

src/Elements/ItemRef.php

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+<?php
+
+namespace EspressoTutorials\Epub\Elements;
+
+class ItemRef
+{
+    public function __construct(
+        protected string $idRef,
+    ) {
+    }
+
+    public function idRef(): string
+    {
+        return $this->idRef;
+    }
+}

src/Elements/RootFile.php

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+<?php
+
+namespace EspressoTutorials\Epub\Elements;
+
+class RootFile
+{
+    public function __construct(
+        protected string $path
+    ) {
+    }
+
+    public function path(): string
+    {
+        return $this->path;
+    }
+}

src/Epub.php

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+<?php
+
+namespace EspressoTutorials\Epub;
+
+class Epub
+{
+    protected \ZipArchive $archive;
+
+    protected ?Container $container = null;
+
+    protected ?Content $content = null;
+
+    protected string $extractionPath;
+
+    public function __construct(
+        protected string $path
+    ) {
+    }
+
+    public function container(): Container
+    {
+        if ($this->container) {
+            return $this->container;
+        }
+
+        return $this->container = new Container(
+            SimpleXMLElement::fromPath($this->extractionPath . '/META-INF/container.xml')
+        );
+    }
+
+    public function content(): Content
+    {
+        if ($this->content) {
+            return $this->content;
+        }
+
+        return $this->content = new Content(
+            SimpleXMLElement::fromPath($this->extractionPath . '/' . $this->container()->rootFile()->path())
+        );
+    }
+
+    public function extractTo(string $path): bool
+    {
+        $this->archive = new \ZipArchive();
+
+        if (!$this->archive->open($this->path)) {
+            return false;
+        }
+
+        if (!$this->archive->extractTo($path)) {
+            return false;
+        }
+
+        $this->extractionPath = $path;
+
+        return true;
+    }
+}

src/SimpleXMLElement.php

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+<?php
+
+namespace EspressoTutorials\Epub;
+
+class SimpleXMLElement extends \SimpleXMLElement
+{
+    public static function fromPath(string $path): self
+    {
+        return new self(file_get_contents($path));
+    }
+}