Initial commit

src/Filter/DocumentFilter.php

@@ -0,0 +1,12 @@
+<?php
+
+namespace Filter;
+
+use PDF\Document;
+
+interface DocumentFilter
+{
+    public function allows(Document $document): bool;
+
+    public function __toString(): string;
+}

src/Filter/FilterFactory.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace Filter;
+
+class FilterFactory
+{
+    public function createFromString(string $string): DocumentFilter
+    {
+        if (preg_match('/^.+=.*$/', $string)) {
+            [$prop, $term] = explode('=', $string);
+            return new SpecificFilter(trim($prop), trim($term));
+        }
+        return new GenericFilter($string);
+    }
+}

src/Filter/GenericFilter.php

@@ -0,0 +1,34 @@
+<?php
+
+namespace Filter;
+
+use PDF\Document;
+
+class GenericFilter implements DocumentFilter
+{
+    private string $term;
+
+    public function __construct(string $term)
+    {
+        $this->term = $term;
+    }
+
+    public function allows(Document $document): bool
+    {
+        if ($this->term === '') {
+            return true;
+        }
+
+        foreach ($document->getProperties() as $key => $value) {
+            if (stripos($value, $this->term) !== false) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    public function __toString(): string
+    {
+        return sprintf('[*] contains \'%s\'', $this->term);
+    }
+}

src/Filter/SpecificFilter.php

@@ -0,0 +1,42 @@
+<?php
+
+namespace Filter;
+
+use PDF\Document;
+use RuntimeException;
+
+class SpecificFilter implements DocumentFilter
+{
+    private string $property;
+    private string $term;
+
+    public function __construct(string $property, string $term)
+    {
+        $this->property = strtolower($property);
+        $this->term = strtolower($term);
+    }
+
+    public function allows(Document $document): bool
+    {
+        if ($this->property === '') {
+            return true;
+        }
+
+        try {
+            $property = $document->getProperty($this->property);
+            if ($this->term === '' && !empty($property)) {
+                // Filter is "prop=", which only checks if it exists.
+                return true;
+            }
+            return stripos($property, $this->term) !== false;
+        } catch (RuntimeException $e) {
+            // No such property exists, we don't pass
+            return false;
+        }
+    }
+
+    public function __toString(): string
+    {
+        return sprintf('property \'%s\' contains \'%s\'', $this->property, $this->term);
+    }
+}