From 0bf5d698e916af7c36833c7d30f7257dcc54f86a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jan=20Bar=C3=A1=C5=A1ek?= <janbarasek@gmail.com>
Date: Mon, 12 Jul 2021 14:06:02 +0200
Subject: [PATCH] Init implementation.

---
 README.md          |  19 ++++-
 composer.json      |   6 +-
 src/.gitkeep       |   0
 src/VideoToken.php | 182 +++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 201 insertions(+), 6 deletions(-)
 delete mode 100644 src/.gitkeep
 create mode 100644 src/VideoToken.php

diff --git a/README.md b/README.md
index d405834..f87b9cc 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,17 @@
-Template
-========
+Video token
+===========
 
-This is a template package.
+Parse video token from user string or URL.
+
+How to use
+----------
+
+Detect token from URL:
+
+```php
+$token = new \Baraja\VideoToken\VideoToken(
+    'https://www.youtube.com/watch?v=_Gi_LQ0a8EA'
+);
+
+echo $token->getToken(); // _Gi_LQ0a8EA
+```
diff --git a/composer.json b/composer.json
index 91660c3..a31bcec 100644
--- a/composer.json
+++ b/composer.json
@@ -1,7 +1,7 @@
 {
-	"name": "baraja-core/template",
-	"description": "This is a template package.",
-	"homepage": "https://github.com/baraja-core/template",
+	"name": "baraja-core/video-token",
+	"description": "Parse video token from user string or URL.",
+	"homepage": "https://github.com/baraja-core/video-token",
 	"authors": [
 		{
 			"name": "Jan Barášek",
diff --git a/src/.gitkeep b/src/.gitkeep
deleted file mode 100644
index e69de29..0000000
diff --git a/src/VideoToken.php b/src/VideoToken.php
new file mode 100644
index 0000000..066b6f6
--- /dev/null
+++ b/src/VideoToken.php
@@ -0,0 +1,182 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Baraja\VideoToken;
+
+
+final class VideoToken
+{
+	public const
+		PROVIDER_YOUTUBE = 'youtube',
+		PROVIDER_VIMEO = 'vimeo';
+
+	private string $token;
+
+	private string $provider;
+
+
+	public function __construct(string $token, ?string $provider = null)
+	{
+		$parser = $this->checkVideoToken(trim($token), $provider ? strtolower($provider) : null);
+		if (strlen($parser['token']) > 32) {
+			throw new \InvalidArgumentException('Video token "' . $token . '" is too long.');
+		}
+		$this->token = $parser['token'];
+		$this->provider = $parser['provider'];
+	}
+
+
+	public function getToken(): string
+	{
+		return $this->token;
+	}
+
+
+	public function getProvider(): string
+	{
+		return $this->provider;
+	}
+
+
+	public function getUrl(): string
+	{
+		if ($this->provider === self::PROVIDER_VIMEO) {
+			return 'https://player.vimeo.com/video/' . urlencode($this->token);
+		}
+		if ($this->provider === self::PROVIDER_YOUTUBE) {
+			return 'https://www.youtube.com/embed/' . urlencode($this->token) . '?rel=0';
+		}
+
+		throw new \LogicException('Provider "' . $this->provider . '" is not supported.');
+	}
+
+
+	public function getThumbnailUrl(): ?string
+	{
+		if ($this->provider === self::PROVIDER_YOUTUBE) {
+			return 'https://img.youtube.com/vi/' . urlencode($this->token) . '/maxresdefault.jpg';
+		}
+		if ($this->provider === self::PROVIDER_VIMEO) {
+			$api = trim(
+				(string)@file_get_contents(
+					'https://vimeo.com/api/oembed.json?url=https%3A//vimeo.com/' . urlencode($this->token)
+				)
+			);
+
+			return json_decode($api, true)['thumbnail_url'] ?? null;
+		}
+
+		return null;
+	}
+
+
+	/**
+	 * Find YouTube token by real URI
+	 *
+	 * 1. User channel with URI prefix (no token)
+	 * 2. Exact match
+	 * 3. URI prefix + token
+	 * 4. Token + organic URL parameters
+	 * 5. User channel (no token)
+	 * 6. URL encoded like API
+	 * 7. Special cases
+	 */
+	public static function parseYouTubeTokenByUrl(string $url): ?string
+	{
+		if (str_starts_with($url, 'user/')) { // 1.
+			return null;
+		}
+		if (preg_match('/^[a-zA-Z0-9\-_]{11}$/', $url) === 1) { // 2.
+			return $url;
+		}
+		if (preg_match(
+				'/^(?:watch\?v=|v\/|embed\/|ytscreeningroom\?v=|\?v=|\?vi=|e\/|watch\?.*vi?=|\?feature=[a-z_]*&v=|vi\/)([a-zA-Z0-9\-_]{11})/',
+				$url,
+				$regularMatch
+			) === 1) { // 3.
+			return $regularMatch[1] ?? null;
+		}
+		if (preg_match('/^([a-zA-Z0-9\-_]{11})(?:\?[a-z]|&[a-z])/', $url, $organicParametersMatch) === 1) { // 4.
+			return $organicParametersMatch[1];
+		}
+		if (preg_match('/u\/1\/([a-zA-Z0-9\-_]{11})(?:\?rel=0)?$/', $url) === 1) { // 5.
+			return null; // 5. User channel without token.
+		}
+		if (preg_match('/(?:watch%3Fv%3D|watch\?v%3D)([a-zA-Z0-9\-_]{11})[%&]/', $url, $urlEncoded) === 1) { // 6.
+			return $urlEncoded[1] ?? null;
+		}
+		if (preg_match('/^watchv=([a-zA-Z0-9\-_]{11})&list=/', $url, $special1) === 1) { // 7. Rules for special cases
+			return $special1[1] ?? null;
+		}
+
+		return null;
+	}
+
+
+	/**
+	 * @return array{token: string, provider: string}
+	 */
+	private function checkVideoToken(string $token, ?string $provider = null): array
+	{
+		$parsedToken = null;
+		$parsedProvider = null;
+
+		if (preg_match('/^(?:https?:\/\/|\/\/)(?:www\.)?(.+)$/', $token, $urlParser) === 1) { // URL
+			if (preg_match(
+					'/^(?:youtube\.com|youtu\.be|youtube-nocookie\.com|yt\.be)\/(.+)$/',
+					$urlParser[1],
+					$youTubeParser,
+				) === 1) {
+				$parsedProvider = self::PROVIDER_YOUTUBE;
+				$parsedToken = self::parseYouTubeTokenByUrl($youTubeParser[1] ?? '');
+			} elseif (preg_match(
+					'/(?:(?:player\.)?vimeo\.com\/(?:video\/)?)?(?<token>\d{8})/',
+					$urlParser[1],
+					$vimeoParser,
+				) === 1) {
+				$parsedProvider = self::PROVIDER_VIMEO;
+				$parsedToken = (string)$vimeoParser['token'];
+			} else {
+				throw new \InvalidArgumentException('Token or URL "' . $token . '" is invalid.');
+			}
+		}
+		if (preg_match('/embed\/([a-zA-Z0-9\-_]{11})"/', $token, $youTubeEmbed) === 1) {
+			$parsedProvider = self::PROVIDER_YOUTUBE;
+			$parsedToken = (string)$youTubeEmbed[1];
+		}
+		if ($parsedProvider !== null && $parsedToken === null) { // Invalid input
+			throw new \InvalidArgumentException('Token can not be parser for "' . $parsedProvider . '" provider.');
+		}
+		$token = $parsedToken ?? $token;
+		$provider = $parsedProvider ?? $provider;
+		$providerHint = $this->resolveProviderByToken($token);
+		if ($provider !== $providerHint && $providerHint !== null) {
+			$provider = $providerHint;
+		}
+		if ($provider === null) {
+			throw new \InvalidArgumentException('Provider for token "' . $token . '" is mandatory.');
+		}
+
+		return [
+			'token' => $token,
+			'provider' => $provider,
+		];
+	}
+
+
+	private function resolveProviderByToken(?string $token): ?string
+	{
+		if ($token === null) {
+			return null;
+		}
+		if (preg_match('/^\d+$/', $token) === 1) {
+			return self::PROVIDER_VIMEO;
+		}
+		if (preg_match('/^[a-zA-Z0-9\-_]{11}$/', $token) === 1) {
+			return self::PROVIDER_YOUTUBE;
+		}
+
+		return null;
+	}
+}