来自外部资源的Typo3流体图像 [英] Typo3 fluid image from external resource

问题描述

是否可以从外部资源调整流体图像的大小。我有来自SOAP的数据扩展。因此，图片网址看起来像 http://www.example.com/url/of/image/imagename.jpg 。

is it possible to resize images in fluid from external resource. I have an extension with datas from SOAP. So image URL looks like http://www.example.com/url/of/image/imagename.jpg.

<f:image src="{data.url.image}" with="300" />

无效。

推荐答案

也许一个自己的ViewHelper获取外部图像并将其保存到临时文件夹可能有所帮助。在此之后你可以修改图像。

Maybe an own ViewHelper which fetch the external image and save it to an temporary folder could help. After this you can modify the image.

像这样（未经测试）：

<?php
  namespace MyNamespaece\MyExt\ViewHelpers;

  use TYPO3\CMS\Core\Utility\GeneralUtility;
  use TYPO3\CMS\Fluid\ViewHelpers\ImageViewHelper;
  use TYPO3\CMS\Core\Resource\FileInterface;
  use TYPO3\CMS\Extbase\Domain\Model\AbstractFileFolder;

  class ExternalImageViewHelper extends ImageViewHelper
  {

  const UPLOAD_DIRECTORY = 'externalImages';
  const TEMP_PREFIX = 'MyExt';

  /**
   * ResourceFactory
   *
   * @var \TYPO3\CMS\Core\Resource\ResourceFactory
   * @inject
   */
  protected $resourceFactory = null;

  /**
   * Resizes a given image (if required) and renders the respective img tag
   *
   * @see https://docs.typo3.org/typo3cms/TyposcriptReference/ContentObjects/Image/
   *
   * @param string                           $src                a path to a file, a combined FAL identifier or an uid (integer). If $treatIdAsReference is set, the integer is considered the uid of the sys_file_reference record. If you already got a FAL object, consider using the $image parameter instead
   * @param string                           $width              width of the image. This can be a numeric value representing the fixed width of the image in pixels. But you can also perform simple calculations by adding "m" or "c" to the value. See imgResource.width for possible options.
   * @param string                           $height             height of the image. This can be a numeric value representing the fixed height of the image in pixels. But you can also perform simple calculations by adding "m" or "c" to the value. See imgResource.width for possible options.
   * @param integer                          $minWidth           minimum width of the image
   * @param integer                          $minHeight          minimum height of the image
   * @param integer                          $maxWidth           maximum width of the image
   * @param integer                          $maxHeight          maximum height of the image
   * @param boolean                          $treatIdAsReference given src argument is a sys_file_reference record
   * @param FileInterface|AbstractFileFolder $image              a FAL object
   *
   * @return string
   * @throws \Exception
   * @throws \TYPO3\CMS\Core\Resource\Exception\InsufficientFolderAccessPermissionsException
   * @throws \TYPO3\CMS\Core\Resource\Exception\InsufficientFolderWritePermissionsException
   * @throws \TYPO3\CMS\Fluid\Core\ViewHelper\Exception
   */
  public function render($src = null, $width = null, $height = null, $minWidth = null, $minHeight = null, $maxWidth = null, $maxHeight = null, $treatIdAsReference = false, $image = null)
  {
    if (filter_var($src, FILTER_VALIDATE_URL)) {
      $storage = $this->resourceFactory->getDefaultStorage();
      if (!$storage->hasFolder(self::UPLOAD_DIRECTORY)) {
        $storage->createFolder(self::UPLOAD_DIRECTORY);
      }

      $externalFile = GeneralUtility::getUrl($src);
      if ($externalFile) {
        $tempFileName = tempnam(sys_get_temp_dir(), self::TEMP_PREFIX);
        $handle       = fopen($tempFileName, "w");
        fwrite($handle, $externalFile);
        fclose($handle);

        $uploadFolder = $storage->getFolder(self::UPLOAD_DIRECTORY);
        $file         = $uploadFolder->addFile($tempFileName, basename(basename($src)), 'changeName');
        $src          = $file->getPublicUrl();
        unlink($tempFileName);
      } else {
        throw new \Exception(sprintf('External URL % cannot accessed.', $src), 1473233519);
      }
    }

    return parent::render($src, $width, $height, $minWidth, $minHeight, $maxWidth, $maxHeight, $treatIdAsReference, $image);
  }
}

请注意：此ViewHelper不检查图像已经取得了！因此应该整合检查。否则这个viewhelper会在每次页面刷新时获取图像！

Please Note: This ViewHelper has no check if the image is allready fetched! So an check should be integrated. Otherwise this viewhelper fetch the image at each page refresh!

如评论中所述，我想澄清一下，ViewHelper不应该在任何生产环境中使用。它应该只展示如何通过这种观察者的方式。不支持编译的模板。也不需要检查文件是否已经存在。您的托管环境可能充斥着下载，可能会破坏您的文件配额！

As mentioned in the comments I want to clarify that this ViewHelper should not be used in any production environment. It should only demonstrate how the way to such an viewhelper could be. Compiled templates are not supported. Also no needed check if the file already exists is implemented. Your hosting environment could be flooded with downloads and can break you file quota!

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