334 lines
9.2 KiB
PHP
334 lines
9.2 KiB
PHP
<?php
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/*
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* Copyright 2013 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* Implementation of levels 1-3 of the URI Template spec.
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* @see http://tools.ietf.org/html/rfc6570
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*/
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class Google_Utils_UriTemplate
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{
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const TYPE_MAP = "1";
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const TYPE_LIST = "2";
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const TYPE_SCALAR = "4";
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/**
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* @var $operators array
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* These are valid at the start of a template block to
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* modify the way in which the variables inside are
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* processed.
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*/
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private $operators = array(
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"+" => "reserved",
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"/" => "segments",
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"." => "dotprefix",
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"#" => "fragment",
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";" => "semicolon",
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"?" => "form",
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"&" => "continuation"
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);
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/**
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* @var reserved array
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* These are the characters which should not be URL encoded in reserved
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* strings.
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*/
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private $reserved = array(
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"=", ",", "!", "@", "|", ":", "/", "?", "#",
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"[", "]",'$', "&", "'", "(", ")", "*", "+", ";"
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);
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private $reservedEncoded = array(
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"%3D", "%2C", "%21", "%40", "%7C", "%3A", "%2F", "%3F",
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"%23", "%5B", "%5D", "%24", "%26", "%27", "%28", "%29",
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"%2A", "%2B", "%3B"
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);
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public function parse($string, array $parameters)
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{
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return $this->resolveNextSection($string, $parameters);
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}
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/**
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* This function finds the first matching {...} block and
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* executes the replacement. It then calls itself to find
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* subsequent blocks, if any.
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*/
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private function resolveNextSection($string, $parameters)
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{
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$start = strpos($string, "{");
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if ($start === false) {
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return $string;
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}
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$end = strpos($string, "}");
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if ($end === false) {
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return $string;
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}
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$string = $this->replace($string, $start, $end, $parameters);
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return $this->resolveNextSection($string, $parameters);
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}
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private function replace($string, $start, $end, $parameters)
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{
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// We know a data block will have {} round it, so we can strip that.
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$data = substr($string, $start + 1, $end - $start - 1);
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// If the first character is one of the reserved operators, it effects
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// the processing of the stream.
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if (isset($this->operators[$data[0]])) {
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$op = $this->operators[$data[0]];
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$data = substr($data, 1);
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$prefix = "";
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$prefix_on_missing = false;
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switch ($op) {
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case "reserved":
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// Reserved means certain characters should not be URL encoded
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$data = $this->replaceVars($data, $parameters, ",", null, true);
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break;
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case "fragment":
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// Comma separated with fragment prefix. Bare values only.
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$prefix = "#";
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$prefix_on_missing = true;
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$data = $this->replaceVars($data, $parameters, ",", null, true);
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break;
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case "segments":
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// Slash separated data. Bare values only.
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$prefix = "/";
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$data =$this->replaceVars($data, $parameters, "/");
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break;
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case "dotprefix":
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// Dot separated data. Bare values only.
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$prefix = ".";
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$prefix_on_missing = true;
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$data = $this->replaceVars($data, $parameters, ".");
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break;
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case "semicolon":
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// Semicolon prefixed and separated. Uses the key name
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$prefix = ";";
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$data = $this->replaceVars($data, $parameters, ";", "=", false, true, false);
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break;
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case "form":
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// Standard URL format. Uses the key name
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$prefix = "?";
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$data = $this->replaceVars($data, $parameters, "&", "=");
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break;
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case "continuation":
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// Standard URL, but with leading ampersand. Uses key name.
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$prefix = "&";
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$data = $this->replaceVars($data, $parameters, "&", "=");
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break;
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}
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// Add the initial prefix character if data is valid.
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if ($data || ($data !== false && $prefix_on_missing)) {
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$data = $prefix . $data;
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}
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} else {
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// If no operator we replace with the defaults.
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$data = $this->replaceVars($data, $parameters);
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}
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// This is chops out the {...} and replaces with the new section.
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return substr($string, 0, $start) . $data . substr($string, $end + 1);
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}
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private function replaceVars(
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$section,
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$parameters,
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$sep = ",",
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$combine = null,
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$reserved = false,
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$tag_empty = false,
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$combine_on_empty = true
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) {
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if (strpos($section, ",") === false) {
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// If we only have a single value, we can immediately process.
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return $this->combine(
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$section,
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$parameters,
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$sep,
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$combine,
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$reserved,
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$tag_empty,
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$combine_on_empty
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);
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} else {
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// If we have multiple values, we need to split and loop over them.
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// Each is treated individually, then glued together with the
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// separator character.
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$vars = explode(",", $section);
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return $this->combineList(
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$vars,
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$sep,
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$parameters,
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$combine,
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$reserved,
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false, // Never emit empty strings in multi-param replacements
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$combine_on_empty
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);
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}
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}
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public function combine(
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$key,
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$parameters,
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$sep,
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$combine,
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$reserved,
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$tag_empty,
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$combine_on_empty
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) {
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$length = false;
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$explode = false;
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$skip_final_combine = false;
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$value = false;
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// Check for length restriction.
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if (strpos($key, ":") !== false) {
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list($key, $length) = explode(":", $key);
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}
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// Check for explode parameter.
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if ($key[strlen($key) - 1] == "*") {
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$explode = true;
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$key = substr($key, 0, -1);
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$skip_final_combine = true;
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}
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// Define the list separator.
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$list_sep = $explode ? $sep : ",";
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if (isset($parameters[$key])) {
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$data_type = $this->getDataType($parameters[$key]);
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switch ($data_type) {
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case self::TYPE_SCALAR:
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$value = $this->getValue($parameters[$key], $length);
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break;
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case self::TYPE_LIST:
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$values = array();
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foreach ($parameters[$key] as $pkey => $pvalue) {
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$pvalue = $this->getValue($pvalue, $length);
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if ($combine && $explode) {
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$values[$pkey] = $key . $combine . $pvalue;
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} else {
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$values[$pkey] = $pvalue;
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}
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}
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$value = implode($list_sep, $values);
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if ($value == '') {
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return '';
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}
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break;
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case self::TYPE_MAP:
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$values = array();
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foreach ($parameters[$key] as $pkey => $pvalue) {
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$pvalue = $this->getValue($pvalue, $length);
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if ($explode) {
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$pkey = $this->getValue($pkey, $length);
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$values[] = $pkey . "=" . $pvalue; // Explode triggers = combine.
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} else {
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$values[] = $pkey;
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$values[] = $pvalue;
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}
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}
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$value = implode($list_sep, $values);
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if ($value == '') {
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return false;
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}
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break;
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}
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} else if ($tag_empty) {
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// If we are just indicating empty values with their key name, return that.
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return $key;
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} else {
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// Otherwise we can skip this variable due to not being defined.
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return false;
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}
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if ($reserved) {
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$value = str_replace($this->reservedEncoded, $this->reserved, $value);
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}
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// If we do not need to include the key name, we just return the raw
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// value.
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if (!$combine || $skip_final_combine) {
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return $value;
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}
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// Else we combine the key name: foo=bar, if value is not the empty string.
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return $key . ($value != '' || $combine_on_empty ? $combine . $value : '');
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}
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/**
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* Return the type of a passed in value
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*/
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private function getDataType($data)
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{
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if (is_array($data)) {
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reset($data);
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if (key($data) !== 0) {
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return self::TYPE_MAP;
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}
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return self::TYPE_LIST;
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}
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return self::TYPE_SCALAR;
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}
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/**
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* Utility function that merges multiple combine calls
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* for multi-key templates.
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*/
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private function combineList(
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$vars,
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$sep,
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$parameters,
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$combine,
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$reserved,
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$tag_empty,
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$combine_on_empty
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) {
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$ret = array();
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foreach ($vars as $var) {
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$response = $this->combine(
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$var,
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$parameters,
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$sep,
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$combine,
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$reserved,
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$tag_empty,
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$combine_on_empty
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);
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if ($response === false) {
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continue;
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}
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$ret[] = $response;
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}
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return implode($sep, $ret);
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}
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/**
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* Utility function to encode and trim values
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*/
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private function getValue($value, $length)
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{
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if ($length) {
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$value = substr($value, 0, $length);
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}
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$value = rawurlencode($value);
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return $value;
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}
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}
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