--- /dev/null
+<?php
+namespace GuzzleHttp;
+
+/**
+ * Expands URI templates. Userland implementation of PECL uri_template.
+ *
+ * @link http://tools.ietf.org/html/rfc6570
+ */
+class UriTemplate
+{
+ /** @var string URI template */
+ private $template;
+
+ /** @var array Variables to use in the template expansion */
+ private $variables;
+
+ /** @var array Hash for quick operator lookups */
+ private static $operatorHash = [
+ '' => ['prefix' => '', 'joiner' => ',', 'query' => false],
+ '+' => ['prefix' => '', 'joiner' => ',', 'query' => false],
+ '#' => ['prefix' => '#', 'joiner' => ',', 'query' => false],
+ '.' => ['prefix' => '.', 'joiner' => '.', 'query' => false],
+ '/' => ['prefix' => '/', 'joiner' => '/', 'query' => false],
+ ';' => ['prefix' => ';', 'joiner' => ';', 'query' => true],
+ '?' => ['prefix' => '?', 'joiner' => '&', 'query' => true],
+ '&' => ['prefix' => '&', 'joiner' => '&', 'query' => true]
+ ];
+
+ /** @var array Delimiters */
+ private static $delims = [':', '/', '?', '#', '[', ']', '@', '!', '$',
+ '&', '\'', '(', ')', '*', '+', ',', ';', '='];
+
+ /** @var array Percent encoded delimiters */
+ private static $delimsPct = ['%3A', '%2F', '%3F', '%23', '%5B', '%5D',
+ '%40', '%21', '%24', '%26', '%27', '%28', '%29', '%2A', '%2B', '%2C',
+ '%3B', '%3D'];
+
+ public function expand($template, array $variables)
+ {
+ if (false === strpos($template, '{')) {
+ return $template;
+ }
+
+ $this->template = $template;
+ $this->variables = $variables;
+
+ return preg_replace_callback(
+ '/\{([^\}]+)\}/',
+ [$this, 'expandMatch'],
+ $this->template
+ );
+ }
+
+ /**
+ * Parse an expression into parts
+ *
+ * @param string $expression Expression to parse
+ *
+ * @return array Returns an associative array of parts
+ */
+ private function parseExpression($expression)
+ {
+ $result = [];
+
+ if (isset(self::$operatorHash[$expression[0]])) {
+ $result['operator'] = $expression[0];
+ $expression = substr($expression, 1);
+ } else {
+ $result['operator'] = '';
+ }
+
+ foreach (explode(',', $expression) as $value) {
+ $value = trim($value);
+ $varspec = [];
+ if ($colonPos = strpos($value, ':')) {
+ $varspec['value'] = substr($value, 0, $colonPos);
+ $varspec['modifier'] = ':';
+ $varspec['position'] = (int) substr($value, $colonPos + 1);
+ } elseif (substr($value, -1) === '*') {
+ $varspec['modifier'] = '*';
+ $varspec['value'] = substr($value, 0, -1);
+ } else {
+ $varspec['value'] = (string) $value;
+ $varspec['modifier'] = '';
+ }
+ $result['values'][] = $varspec;
+ }
+
+ return $result;
+ }
+
+ /**
+ * Process an expansion
+ *
+ * @param array $matches Matches met in the preg_replace_callback
+ *
+ * @return string Returns the replacement string
+ */
+ private function expandMatch(array $matches)
+ {
+ static $rfc1738to3986 = ['+' => '%20', '%7e' => '~'];
+
+ $replacements = [];
+ $parsed = self::parseExpression($matches[1]);
+ $prefix = self::$operatorHash[$parsed['operator']]['prefix'];
+ $joiner = self::$operatorHash[$parsed['operator']]['joiner'];
+ $useQuery = self::$operatorHash[$parsed['operator']]['query'];
+
+ foreach ($parsed['values'] as $value) {
+
+ if (!isset($this->variables[$value['value']])) {
+ continue;
+ }
+
+ $variable = $this->variables[$value['value']];
+ $actuallyUseQuery = $useQuery;
+ $expanded = '';
+
+ if (is_array($variable)) {
+
+ $isAssoc = $this->isAssoc($variable);
+ $kvp = [];
+ foreach ($variable as $key => $var) {
+
+ if ($isAssoc) {
+ $key = rawurlencode($key);
+ $isNestedArray = is_array($var);
+ } else {
+ $isNestedArray = false;
+ }
+
+ if (!$isNestedArray) {
+ $var = rawurlencode($var);
+ if ($parsed['operator'] === '+' ||
+ $parsed['operator'] === '#'
+ ) {
+ $var = $this->decodeReserved($var);
+ }
+ }
+
+ if ($value['modifier'] === '*') {
+ if ($isAssoc) {
+ if ($isNestedArray) {
+ // Nested arrays must allow for deeply nested
+ // structures.
+ $var = strtr(
+ http_build_query([$key => $var]),
+ $rfc1738to3986
+ );
+ } else {
+ $var = $key . '=' . $var;
+ }
+ } elseif ($key > 0 && $actuallyUseQuery) {
+ $var = $value['value'] . '=' . $var;
+ }
+ }
+
+ $kvp[$key] = $var;
+ }
+
+ if (empty($variable)) {
+ $actuallyUseQuery = false;
+ } elseif ($value['modifier'] === '*') {
+ $expanded = implode($joiner, $kvp);
+ if ($isAssoc) {
+ // Don't prepend the value name when using the explode
+ // modifier with an associative array.
+ $actuallyUseQuery = false;
+ }
+ } else {
+ if ($isAssoc) {
+ // When an associative array is encountered and the
+ // explode modifier is not set, then the result must be
+ // a comma separated list of keys followed by their
+ // respective values.
+ foreach ($kvp as $k => &$v) {
+ $v = $k . ',' . $v;
+ }
+ }
+ $expanded = implode(',', $kvp);
+ }
+
+ } else {
+ if ($value['modifier'] === ':') {
+ $variable = substr($variable, 0, $value['position']);
+ }
+ $expanded = rawurlencode($variable);
+ if ($parsed['operator'] === '+' || $parsed['operator'] === '#') {
+ $expanded = $this->decodeReserved($expanded);
+ }
+ }
+
+ if ($actuallyUseQuery) {
+ if (!$expanded && $joiner !== '&') {
+ $expanded = $value['value'];
+ } else {
+ $expanded = $value['value'] . '=' . $expanded;
+ }
+ }
+
+ $replacements[] = $expanded;
+ }
+
+ $ret = implode($joiner, $replacements);
+ if ($ret && $prefix) {
+ return $prefix . $ret;
+ }
+
+ return $ret;
+ }
+
+ /**
+ * Determines if an array is associative.
+ *
+ * This makes the assumption that input arrays are sequences or hashes.
+ * This assumption is a tradeoff for accuracy in favor of speed, but it
+ * should work in almost every case where input is supplied for a URI
+ * template.
+ *
+ * @param array $array Array to check
+ *
+ * @return bool
+ */
+ private function isAssoc(array $array)
+ {
+ return $array && array_keys($array)[0] !== 0;
+ }
+
+ /**
+ * Removes percent encoding on reserved characters (used with + and #
+ * modifiers).
+ *
+ * @param string $string String to fix
+ *
+ * @return string
+ */
+ private function decodeReserved($string)
+ {
+ return str_replace(self::$delimsPct, self::$delims, $string);
+ }
+}
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