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<?php |
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/** |
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* iCalendar plugin for Craft CMS 3.x |
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* |
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* Tools for parsing & formatting the RFC 2445 iCalendar (.ics) specification |
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* |
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* @link https://nystudio107.com |
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* @copyright Copyright (c) 2018 nystudio107 |
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*/ |
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namespace nystudio107\icalendar\services; |
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use craft\base\Component; |
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/** |
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* @author nystudio107 |
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* @package ICalendar |
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* @since 1.0.0 |
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*/ |
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class Convert extends Component |
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{ |
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// Constants |
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// ========================================================================= |
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protected const RFC2455_EOL = "\r\n"; |
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protected const RFC2455_TAB = "\t"; |
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protected const RFC2455_LITERAL_NEWLINE = '\n'; |
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protected const MAX_OCTETS = 75; |
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// Public Methods |
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// ========================================================================= |
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/** |
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* Format the passed in $text as per the iCalendar RFC 2445 spec: |
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* https://icalendar.org/validator.html |
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* |
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* @param string $text |
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* |
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* @return string |
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*/ |
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public function rfc2445(string $text): string |
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{ |
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$result = ''; |
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// Normalize the line breaks |
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$text = str_replace(["\n", "\r\r\n"], self::RFC2455_EOL, $text); |
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// Handle rich text field output, such as from Redactor, which may have line or paragraph breaks |
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$text = str_replace(["</p>\r", "</P>\r"], self::RFC2455_LITERAL_NEWLINE . self::RFC2455_LITERAL_NEWLINE, $text); |
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$text = str_replace(["<br>\r", "<BR>\r", "<br />\r", "<BR />\r"], self::RFC2455_LITERAL_NEWLINE, $text); |
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// Split the text into separate lines |
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$lines = explode(self::RFC2455_EOL, $text); |
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foreach ($lines as $key => $line) { |
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$result .= $this->icalSplit('', $line) . self::RFC2455_EOL; |
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} |
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return $result; |
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} |
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// Protected Methods |
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// ========================================================================= |
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/** |
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* Split the lines into RFC 2445 compatible line breaks so that no line |
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* is longer than 75 octets |
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* Adapted from: https://gist.github.com/hugowetterberg/81747 |
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* |
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* @param string $preamble |
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* @param string $value |
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* |
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* @return string |
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*/ |
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protected function icalSplit(string $preamble, string $value): string |
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{ |
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$value = trim($value); |
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$value = strip_tags($value); |
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$value = html_entity_decode($value); |
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$value = preg_replace('/\n+/', ' ', $value); |
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$value = preg_replace('/\s{2,}/', ' ', $value); |
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$preamble_len = mb_strlen($preamble); |
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$lines = []; |
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while (mb_strlen($value) > (self::MAX_OCTETS - $preamble_len)) { |
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$space = (self::MAX_OCTETS - $preamble_len); |
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$mbcc = $space; |
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while ($mbcc) { |
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$line = mb_substr($value, 0, $mbcc); |
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$oct = mb_strlen($line); |
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if ($oct > $space) { |
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$mbcc -= $oct - $space; |
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} else { |
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$lines[] = $line; |
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$preamble_len = 1; // Still take the tab into account |
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$value = mb_substr($value, $mbcc); |
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break; |
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} |
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} |
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} |
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if (!empty($value)) { |
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$lines[] = $value; |
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} |
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return implode(self::RFC2455_EOL . self::RFC2455_TAB, $lines); |
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} |
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} |
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