gistfile1.aw

<?php

class Model_Student_Profile extends ORM {

	/**
	 * Model validation rules
	 */
	public function rules()
	{
		return array(
			'photo' => array(
				array(array($this, 'validate_photo'), array(':validation', ':field', ':value', 200, 200)),
			),
		);
	}

	/**
	 * Validate a photo path OR an uploaded file array.
	 * This ensure the photo is the correct type and size.
	 *
	 * Also checks that a photo is large enough
	 *
	 * @param Validation $validation The validation object
	 * @param string $field The name of the upload field
	 * @param string|array Eaither a new uploaded photo or a photo path
	 * @param int $min_height The minimum height of the photo
	 * @param int $min_width The minimum width of the photo
	 * @return mixed
	 */
	public function validate_photo($validation, $field, $photo, $min_height, $min_width)
	{
		// Check if we JUST uploaded a new photo file the $_FILES array
		if (Upload::valid($photo))
		{
			$photo = $photo['tmp_name'];
		}

		// Don't worry about it if there's no photo
		if (empty($photo))
			return;

		try
		{
			try
			{
				// Get the width and height from the uploaded image
				list($width, $height) = getimagesize($photo);
			}
			catch(Exception $e)
			{
				// Ignore file read exceptions
			}

			// Check the uploaded photo is indeed a valid photo
			if (empty($width) OR empty($height))
			{
				$validation->error($field, 'invalid_file');
				throw new Kohana_Exception("Invalid image file");
			}

			// Check that the photo is big enough
			if ($height < $min_height AND $width < $min_width)
			{
				$validation->error($field, 'invalid_size', array($min_height, $min_width));
				throw new Kohana_Exception("Invalid image size");
			}
		}
		catch(Exception $e)
		{
			// Set photo field to it's old value so not to display a broken image
			$this->_object[$field] = $this->_original_values[$field];
		}
	}

	/**
	 * Override the save method to save an uploaded
	 * image into the proper directory along with
	 * resizing the photo down to a more manageable size
	 */
	public function save(Validation $validation = NULL)
	{
		// Ignore the photo if it wasn't set via an upload
		if ( ! Upload::valid($this->photo))
			return parent::save($validation);

		// Validate the fields
		$this->check($validation);

		// Ensure that the upload was successful
		if ($this->photo['error'] === UPLOAD_ERR_OK)
		{
			$image = Image::factory($this->photo['tmp_name']);

			// Crop the image if it isn't square
			if ($image->width != $image->height)
			{
				if ($image->width > $image->height)
				{
					$image->crop($image->height, $image->height);
				}
				else
				{
					$image->crop($image->width, $image->width);
				}
			}

			// Scale the image down to 200x200
			$image->resize(200, 200);

			// Generate a file name and path for the image
			$path = sprintf('uploads/profiles/%s.jpg', Text::random(NULL, 16));

			// Ensure the directory exists in the file system
			if ( ! file_exists($directory = dirname(DOCROOT.$path)))
			{
				mkdir($directory, 0775, TRUE);
			}

			// Delete the old file if there is one
			if (is_file($original = DOCROOT.$this->_original_values['photo']))
			{
				unlink($original);
			}

			// Save the image into the given path
			$image->save(DOCROOT.$path);

			// Store the image path in the database
			$this->photo = $path;
		}

		// Unsuccessful, reset the photo field
		else
		{
			unset($this->_changed['photo']);
			$this->_object['photo'] = $this->_original_values['photo'];
		}

		return parent::save($validation);
	}

}