<?php
namespace Sabre\VObject\Parser;
use Sabre\VObject\Component;
use Sabre\VObject\Component\VCalendar;
use Sabre\VObject\Component\VCard;
use Sabre\VObject\Document;
use Sabre\VObject\EofException;
use Sabre\VObject\ParseException;
/**
* MimeDir parser.
*
* This class parses iCalendar 2.0 and vCard 2.1, 3.0 and 4.0 files. This
* parser will return one of the following two objects from the parse method:
*
* Sabre\VObject\Component\VCalendar
* Sabre\VObject\Component\VCard
*
* @copyright Copyright (C) fruux GmbH (https://fruux.com/)
* @author Evert Pot (http://evertpot.com/)
* @license http://sabre.io/license/ Modified BSD License
*/
class MimeDir extends Parser {
/**
* The input stream.
*
* @var resource
*/
protected $input;
/**
* Root component.
*
* @var Component
*/
protected $root;
/**
* By default all input will be assumed to be UTF-8.
*
* However, both iCalendar and vCard might be encoded using different
* character sets. The character set is usually set in the mime-type.
*
* If this is the case, use setEncoding to specify that a different
* encoding will be used. If this is set, the parser will automatically
* convert all incoming data to UTF-8.
*
* @var string
*/
protected $charset = 'UTF-8';
/**
* The list of character sets we support when decoding.
*
* This would be a const expression but for now we need to support PHP 5.5
*/
protected static $SUPPORTED_CHARSETS = [
'UTF-8',
'ISO-8859-1',
'Windows-1252',
];
/**
* Parses an iCalendar or vCard file.
*
* Pass a stream or a string. If null is parsed, the existing buffer is
* used.
*
* @param string|resource|null $input
* @param int $options
*
* @return Sabre\VObject\Document
*/
function parse($input = null, $options = 0) {
$this->root = null;
if (!is_null($input)) {
$this->setInput($input);
}
if (0 !== $options) {
$this->options = $options;
}
$this->parseDocument();
return $this->root;
}
/**
* By default all input will be assumed to be UTF-8.
*
* However, both iCalendar and vCard might be encoded using different
* character sets. The character set is usually set in the mime-type.
*
* If this is the case, use setEncoding to specify that a different
* encoding will be used. If this is set, the parser will automatically
* convert all incoming data to UTF-8.
*
* @param string $charset
*/
function setCharset($charset) {
if (!in_array($charset, self::$SUPPORTED_CHARSETS)) {
throw new \InvalidArgumentException('Unsupported encoding. (Supported encodings: ' . implode(', ', self::$SUPPORTED_CHARSETS) . ')');
}
$this->charset = $charset;
}
/**
* Sets the input buffer. Must be a string or stream.
*
* @param resource|string $input
*
* @return void
*/
function setInput($input) {
// Resetting the parser
$this->lineIndex = 0;
$this->startLine = 0;
if (is_string($input)) {
// Convering to a stream.
$stream = fopen('php://temp', 'r+');
fwrite($stream, $input);
rewind($stream);
$this->input = $stream;
} elseif (is_resource($input)) {
$this->input = $input;
} else {
throw new \InvalidArgumentException('This parser can only read from strings or streams.');
}
}
/**
* Parses an entire document.
*
* @return void
*/
protected function parseDocument() {
$line = $this->readLine();
// BOM is ZERO WIDTH NO-BREAK SPACE (U+FEFF).
// It's 0xEF 0xBB 0xBF in UTF-8 hex.
if (3 <= strlen($line)
&& ord($line[0]) === 0xef
&& ord($line[1]) === 0xbb
&& ord($line[2]) === 0xbf) {
$line = substr($line, 3);
}
switch (strtoupper($line)) {
case 'BEGIN:VCALENDAR' :
$class = VCalendar::$componentMap['VCALENDAR'];
break;
case 'BEGIN:VCARD' :
$class = VCard::$componentMap['VCARD'];
break;
default :
throw new ParseException('This parser only supports VCARD and VCALENDAR files');
}
$this->root = new $class([], false);
while (true) {
// Reading until we hit END:
$line = $this->readLine();
if (strtoupper(substr($line, 0, 4)) === 'END:') {
break;
}
$result = $this->parseLine($line);
if ($result) {
$this->root->add($result);
}
}
$name = strtoupper(substr($line, 4));
if ($name !== $this->root->name) {
throw new ParseException('Invalid MimeDir file. expected: "END:' . $this->root->name . '" got: "END:' . $name . '"');
}
}
/**
* Parses a line, and if it hits a component, it will also attempt to parse
* the entire component.
*
* @param string $line Unfolded line
*
* @return Node
*/
protected function parseLine($line) {
// Start of a new component
if (strtoupper(substr($line, 0, 6)) === 'BEGIN:') {
$component = $this->root->createComponent(substr($line, 6), [], false);
while (true) {
// Reading until we hit END:
$line = $this->readLine();
if (strtoupper(substr($line, 0, 4)) === 'END:') {
break;
}
$result = $this->parseLine($line);
if ($result) {
$component->add($result);
}
}
$name = strtoupper(substr($line, 4));
if ($name !== $component->name) {
throw new ParseException('Invalid MimeDir file. expected: "END:' . $component->name . '" got: "END:' . $name . '"');
}
return $component;
} else {
// Property reader
$property = $this->readProperty($line);
if (!$property) {
// Ignored line
return false;
}
return $property;
}
}
/**
* We need to look ahead 1 line every time to see if we need to 'unfold'
* the next line.
*
* If that was not the case, we store it here.
*
* @var null|string
*/
protected $lineBuffer;
/**
* The real current line number.
*/
protected $lineIndex = 0;
/**
* In the case of unfolded lines, this property holds the line number for
* the start of the line.
*
* @var int
*/
protected $startLine = 0;
/**
* Contains a 'raw' representation of the current line.
*
* @var string
*/
protected $rawLine;
/**
* Reads a single line from the buffer.
*
* This method strips any newlines and also takes care of unfolding.
*
* @throws \Sabre\VObject\EofException
*
* @return string
*/
protected function readLine() {
if (!\is_null($this->lineBuffer)) {
$rawLine = $this->lineBuffer;
$this->lineBuffer = null;
} else {
do {
$eof = \feof($this->input);
$rawLine = \fgets($this->input);
if ($eof || (\feof($this->input) && $rawLine === false)) {
throw new EofException('End of document reached prematurely');
}
if ($rawLine === false) {
throw new ParseException('Error reading from input stream');
}
$rawLine = \rtrim($rawLine, "\r\n");
} while ($rawLine === ''); // Skipping empty lines
$this->lineIndex++;
}
$line = $rawLine;
$this->startLine = $this->lineIndex;
// Looking ahead for folded lines.
while (true) {
$nextLine = \rtrim(\fgets($this->input), "\r\n");
$this->lineIndex++;
if (!$nextLine) {
break;
}
if ($nextLine[0] === "\t" || $nextLine[0] === " ") {
$curLine = \substr($nextLine, 1);
$line .= $curLine;
$rawLine .= "\n " . $curLine;
} else {
$this->lineBuffer = $nextLine;
break;
}
}
$this->rawLine = $rawLine;
return $line;
}
/**
* Reads a property or component from a line.
*
* @return void
*/
protected function readProperty($line) {
if ($this->options & self::OPTION_FORGIVING) {
$propNameToken = 'A-Z0-9\-\._\\/';
} else {
$propNameToken = 'A-Z0-9\-\.';
}
$paramNameToken = 'A-Z0-9\-';
$safeChar = '^";:,';
$qSafeChar = '^"';
$regex = "/
^(?P<name> [$propNameToken]+ ) (?=[;:]) # property name
|
(?<=:)(?P<propValue> .+)$ # property value
|
;(?P<paramName> [$paramNameToken]+) (?=[=;:]) # parameter name
|
(=|,)(?P<paramValue> # parameter value
(?: [$safeChar]*) |
\"(?: [$qSafeChar]+)\"
) (?=[;:,])
/xi";
//echo $regex, "\n"; die();
preg_match_all($regex, $line, $matches, PREG_SET_ORDER);
$property = [
'name' => null,
'parameters' => [],
'value' => null
];
$lastParam = null;
/**
* Looping through all the tokens.
*
* Note that we are looping through them in reverse order, because if a
* sub-pattern matched, the subsequent named patterns will not show up
* in the result.
*/
foreach ($matches as $match) {
if (isset($match['paramValue'])) {
if ($match['paramValue'] && $match['paramValue'][0] === '"') {
$value = substr($match['paramValue'], 1, -1);
} else {
$value = $match['paramValue'];
}
$value = $this->unescapeParam($value);
if (is_null($lastParam)) {
throw new ParseException('Invalid Mimedir file. Line starting at ' . $this->startLine . ' did not follow iCalendar/vCard conventions');
}
if (is_null($property['parameters'][$lastParam])) {
$property['parameters'][$lastParam] = $value;
} elseif (is_array($property['parameters'][$lastParam])) {
$property['parameters'][$lastParam][] = $value;
} else {
$property['parameters'][$lastParam] = [
$property['parameters'][$lastParam],
$value
];
}
continue;
}
if (isset($match['paramName'])) {
$lastParam = strtoupper($match['paramName']);
if (!isset($property['parameters'][$lastParam])) {
$property['parameters'][$lastParam] = null;
}
continue;
}
if (isset($match['propValue'])) {
$property['value'] = $match['propValue'];
continue;
}
if (isset($match['name']) && $match['name']) {
$property['name'] = strtoupper($match['name']);
continue;
}
// @codeCoverageIgnoreStart
throw new \LogicException('This code should not be reachable');
// @codeCoverageIgnoreEnd
}
if (is_null($property['value'])) {
$property['value'] = '';
}
if (!$property['name']) {
if ($this->options & self::OPTION_IGNORE_INVALID_LINES) {
return false;
}
throw new ParseException('Invalid Mimedir file. Line starting at ' . $this->startLine . ' did not follow iCalendar/vCard conventions');
}
// vCard 2.1 states that parameters may appear without a name, and only
// a value. We can deduce the value based on it's name.
//
// Our parser will get those as parameters without a value instead, so
// we're filtering these parameters out first.
$namedParameters = [];
$namelessParameters = [];
foreach ($property['parameters'] as $name => $value) {
if (!is_null($value)) {
$namedParameters[$name] = $value;
} else {
$namelessParameters[] = $name;
}
}
$propObj = $this->root->createProperty($property['name'], null, $namedParameters);
foreach ($namelessParameters as $namelessParameter) {
$propObj->add(null, $namelessParameter);
}
if (strtoupper($propObj['ENCODING']) === 'QUOTED-PRINTABLE') {
$propObj->setQuotedPrintableValue($this->extractQuotedPrintableValue());
} else {
$charset = $this->charset;
if ($this->root->getDocumentType() === Document::VCARD21 && isset($propObj['CHARSET'])) {
// vCard 2.1 allows the character set to be specified per property.
$charset = (string)$propObj['CHARSET'];
}
switch (strtolower($charset)) {
case 'utf-8' :
break;
case 'iso-8859-1' :
$property['value'] = utf8_encode($property['value']);
break;
case 'windows-1252' :
$property['value'] = mb_convert_encoding($property['value'], 'UTF-8', $charset);
break;
default :
throw new ParseException('Unsupported CHARSET: ' . $propObj['CHARSET']);
}
$propObj->setRawMimeDirValue($property['value']);
}
return $propObj;
}
/**
* Unescapes a property value.
*
* vCard 2.1 says:
* * Semi-colons must be escaped in some property values, specifically
* ADR, ORG and N.
* * Semi-colons must be escaped in parameter values, because semi-colons
* are also use to separate values.
* * No mention of escaping backslashes with another backslash.
* * newlines are not escaped either, instead QUOTED-PRINTABLE is used to
* span values over more than 1 line.
*
* vCard 3.0 says:
* * (rfc2425) Backslashes, newlines (\n or \N) and comma's must be
* escaped, all time time.
* * Comma's are used for delimeters in multiple values
* * (rfc2426) Adds to to this that the semi-colon MUST also be escaped,
* as in some properties semi-colon is used for separators.
* * Properties using semi-colons: N, ADR, GEO, ORG
* * Both ADR and N's individual parts may be broken up further with a
* comma.
* * Properties using commas: NICKNAME, CATEGORIES
*
* vCard 4.0 (rfc6350) says:
* * Commas must be escaped.
* * Semi-colons may be escaped, an unescaped semi-colon _may_ be a
* delimiter, depending on the property.
* * Backslashes must be escaped
* * Newlines must be escaped as either \N or \n.
* * Some compound properties may contain multiple parts themselves, so a
* comma within a semi-colon delimited property may also be unescaped
* to denote multiple parts _within_ the compound property.
* * Text-properties using semi-colons: N, ADR, ORG, CLIENTPIDMAP.
* * Text-properties using commas: NICKNAME, RELATED, CATEGORIES, PID.
*
* Even though the spec says that commas must always be escaped, the
* example for GEO in Section 6.5.2 seems to violate this.
*
* iCalendar 2.0 (rfc5545) says:
* * Commas or semi-colons may be used as delimiters, depending on the
* property.
* * Commas, semi-colons, backslashes, newline (\N or \n) are always
* escaped, unless they are delimiters.
* * Colons shall not be escaped.
* * Commas can be considered the 'default delimiter' and is described as
* the delimiter in cases where the order of the multiple values is
* insignificant.
* * Semi-colons are described as the delimiter for 'structured values'.
* They are specifically used in Semi-colons are used as a delimiter in
* REQUEST-STATUS, RRULE, GEO and EXRULE. EXRULE is deprecated however.
*
* Now for the parameters
*
* If delimiter is not set (null) this method will just return a string.
* If it's a comma or a semi-colon the string will be split on those
* characters, and always return an array.
*
* @param string $input
* @param string $delimiter
*
* @return string|string[]
*/
static function unescapeValue($input, $delimiter = ';') {
$regex = '# (?: (\\\\ (?: \\\\ | N | n | ; | , ) )';
if ($delimiter) {
$regex .= ' | (' . $delimiter . ')';
}
$regex .= ') #x';
$matches = preg_split($regex, $input, -1, PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY);
$resultArray = [];
$result = '';
foreach ($matches as $match) {
switch ($match) {
case '\\\\' :
$result .= '\\';
break;
case '\N' :
case '\n' :
$result .= "\n";
break;
case '\;' :
$result .= ';';
break;
case '\,' :
$result .= ',';
break;
case $delimiter :
$resultArray[] = $result;
$result = '';
break;
default :
$result .= $match;
break;
}
}
$resultArray[] = $result;
return $delimiter ? $resultArray : $result;
}
/**
* Unescapes a parameter value.
*
* vCard 2.1:
* * Does not mention a mechanism for this. In addition, double quotes
* are never used to wrap values.
* * This means that parameters can simply not contain colons or
* semi-colons.
*
* vCard 3.0 (rfc2425, rfc2426):
* * Parameters _may_ be surrounded by double quotes.
* * If this is not the case, semi-colon, colon and comma may simply not
* occur (the comma used for multiple parameter values though).
* * If it is surrounded by double-quotes, it may simply not contain
* double-quotes.
* * This means that a parameter can in no case encode double-quotes, or
* newlines.
*
* vCard 4.0 (rfc6350)
* * Behavior seems to be identical to vCard 3.0
*
* iCalendar 2.0 (rfc5545)
* * Behavior seems to be identical to vCard 3.0
*
* Parameter escaping mechanism (rfc6868) :
* * This rfc describes a new way to escape parameter values.
* * New-line is encoded as ^n
* * ^ is encoded as ^^.
* * " is encoded as ^'
*
* @param string $input
*
* @return void
*/
private function unescapeParam($input) {
return
preg_replace_callback(
'#(\^(\^|n|\'))#',
function($matches) {
switch ($matches[2]) {
case 'n' :
return "\n";
case '^' :
return '^';
case '\'' :
return '"';
// @codeCoverageIgnoreStart
}
// @codeCoverageIgnoreEnd
},
$input
);
}
/**
* Gets the full quoted printable value.
*
* We need a special method for this, because newlines have both a meaning
* in vCards, and in QuotedPrintable.
*
* This method does not do any decoding.
*
* @return string
*/
private function extractQuotedPrintableValue() {
// We need to parse the raw line again to get the start of the value.
//
// We are basically looking for the first colon (:), but we need to
// skip over the parameters first, as they may contain one.
$regex = '/^
(?: [^:])+ # Anything but a colon
(?: "[^"]")* # A parameter in double quotes
: # start of the value we really care about
(.*)$
/xs';
preg_match($regex, $this->rawLine, $matches);
$value = $matches[1];
// Removing the first whitespace character from every line. Kind of
// like unfolding, but we keep the newline.
$value = str_replace("\n ", "\n", $value);
// Microsoft products don't always correctly fold lines, they may be
// missing a whitespace. So if 'forgiving' is turned on, we will take
// those as well.
if ($this->options & self::OPTION_FORGIVING) {
while (substr($value, -1) === '=') {
// Reading the line
$this->readLine();
// Grabbing the raw form
$value .= "\n" . $this->rawLine;
}
}
return $value;
}
}
