在Drupal中调用图像上传脚本 [英] Calling script on image upload in Drupal

问题描述

当用户将图像上传到我的Drupal内容类型时，我想调用Ruby脚本。我有一个CCK图像字段作为主图像，ImageCache负责调整大小并为我创建缩略图。

I would like to call a Ruby script when a user uploads an image to my Drupal content-type. I have a CCK image field that serves as the main image, and ImageCache takes care of resizing and creating thumbnails for me.

我有一个Ruby脚本可以进行一些转换图像，但我不知道如何调用它（没有真正的Ruby经验）。基本上脚本应用了一些图像变换，然后生成一个新图像。

I have a Ruby script that does some transformations to the image, however I don't exactly know how to call it (no experience with Ruby really). Basically the script applies some image transforms and then generates a new image.

我的问题是如何从Drupal调用这个脚本...是否有某种关于CCK图片上传，我会劫持？

My question is how to call this script from Drupal...is there some sort of hook regarding the CCK image upload that I would hijack?

推荐答案

ImageField使用与FileField相同的API。因此，您可以为上载字段添加自定义验证器，这将对映像进行一些检查（如调用ruby脚本）。

ImageField uses the same API as FileField. Therefore, you could add a custom validator for your upload field, which would do some checks on the image (like calling a ruby script).

我前段时间在Drupal.org上描述过： http://drupal.org/node/546146

I described that some time ago on Drupal.org, see: http://drupal.org/node/546146

但是，为方便起见，这里是代码。

However, for your convenience, here the code.

首先，为上传表单定义验证器：

First, define a validator for the upload form:

function example_form_alter(&$form, $form_state, $form_id) {
  if ($form_id != 'ID_OF_YOUR_FORM')
    return;

  $form['FIELDNAME'][0]['#upload_validators']['example_FUNCTIONNAME'] = array();

  return $form;
}

其次，实现验证器功能：

Second, implement the validator function:

function example_FUNCTIONNAME($field) {
  // variable for error messages
  $errors = array();

  // do some processing on the field
  $filepath = $field->filepath;

  ...

  // in case of error, add error message
  $errors[] = t('Validation failed, because...');

  return $errors;
}

将此代码放入自定义模块中，但要确保调用模块在FileField和ImageField之后（在系统表中调整权重）。

Put this code in a custom module, but make sure that your module is called after FileField and ImageField (adjust weight in system table).

更新：还有另一种方法可以挂钩。您可以使用hook_nodeapi对操作presave做出反应。这也允许您在上传字段的内容上调用脚本。

Update: There is another way to hook into it. You can use hook_nodeapi to react on operation "presave". This also allows you to call a script on the content of the uploaded field.

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