add multiple server support

modules/openapi-generator/src/main/resources/php/Configuration.mustache

@@ -419,4 +419,82 @@ class Configuration
 
         return $keyWithPrefix;
     }
+
+    /**
+     * Returns an array of host setting
+     *
+     * @return an array of host setting
+     */
+    public function getHostSettings()
+    {
+        return array(
+        {{#servers}}
+          array(
+            "url" => "{{{url}}}",
+            "description" => "{{{description}}}{{^description}}No description provided{{/description}}",
+            {{#variables}}
+            {{#-first}}
+            "variables" => array(
+            {{/-first}}
+              "{{{name}}}" => array(
+                  "description" => "{{{description}}}{{^description}}No description provided{{/description}}",
+                  "default_value" => "{{{defaultValue}}}",
+                  {{#enumValues}}
+                  {{#-first}}
+                  "enum_values" => array(
+                  {{/-first}}
+                    "{{{.}}}"{{^-last}},{{/-last}}
+                  {{#-last}}
+                  )
+                  {{/-last}}
+                  {{/enumValues}}
+                ){{^-last}},{{/-last}}
+              {{#-last}}
+              )
+              {{/-last}}
+            {{/variables}}
+          ){{^-last}},{{/-last}}
+        {{/servers}}
+        );
+    }
+
+    /**
+     * Returns URL based on index and variables
+     *
+     * @param index array index of the host settings
+     * @param variables hash of variable and the corresponding value
+     * @return URL based on host settings
+     */
+    public function getHostFromSettings($index, $variables)
+    {
+        if (null === $variables) {
+            $variables = array();
+        }
+
+        $hosts = $this->getHostSettings();
+
+        // check array index out of bound
+        if ($index < 0 || $index > sizeof($hosts)) {
+            throw new \InvalidArgumentException("Invalid index $index when selecting the server. Must be less than ".sizeof(servers));
+        }
+
+        $host = $hosts[$index];
+        $url = $host["url"];
+
+        // go through variable and assign a value
+        foreach ($host["variables"] as $name => $variable) {
+            if (array_key_exists($name, $variables)) { // check to see if it's in the variables provided by the user
+                if (in_array($variables[$name], $variable["enum_values"])) { // check to see if the value is in the enum
+                    $url = str_replace("{".$name."}", $variables[$name], $url);
+                } else {
+                    throw new \InvalidArgumentException("The variable `$name` in the server URL has invalid value ".$variables[$name].". Must be ".join(',', $variable["enum_values"]).".");
+                }
+            } else {
+                // use default value
+                $url = str_replace("{".$name."}", $variable["default_value"], $url);
+            }
+        }
+
+        return $url;
+    }
 }

samples/openapi3/client/petstore/php/OpenAPIClient-php/lib/Configuration.php

@@ -426,4 +426,92 @@ public function getApiKeyWithPrefix($apiKeyIdentifier)
 
         return $keyWithPrefix;
     }
+
+    /**
+     * Returns an array of host setting
+     *
+     * @return an array of host setting
+     */
+    public function getHostSettings()
+    {
+        return array(
+          array(
+            "url" => "http://{server}.swagger.io:{port}/v2",
+            "description" => "petstore server",
+            "variables" => array(
+              "server" => array(
+                  "description" => "No description provided",
+                  "default_value" => "petstore",
+                  "enum_values" => array(
+                    "petstore",
+                    "qa-petstore",
+                    "dev-petstore"
+                  )
+                ),
+              "port" => array(
+                  "description" => "No description provided",
+                  "default_value" => "80",
+                  "enum_values" => array(
+                    "80",
+                    "8080"
+                  )
+                )
+              )
+          ),
+          array(
+            "url" => "https://localhost:8080/{version}",
+            "description" => "The local server",
+            "variables" => array(
+              "version" => array(
+                  "description" => "No description provided",
+                  "default_value" => "v2",
+                  "enum_values" => array(
+                    "v1",
+                    "v2"
+                  )
+                )
+              )
+          )
+        );
+    }
+
+    /**
+     * Returns URL based on index and variables
+     *
+     * @param index array index of the host settings
+     * @param variables hash of variable and the corresponding value
+     * @return URL based on host settings
+     */
+    public function getHostFromSettings($index, $variables)
+    {
+        if (null === $variables) {
+            $variables = array();
+        }
+
+        $hosts = $this->getHostSettings();
+
+        // check array index out of bound
+        if ($index < 0 || $index > sizeof($hosts)) {
+            throw new \InvalidArgumentException("Invalid index $index when selecting the server. Must be less than ".sizeof(servers));
+        }
+
+        $host = $hosts[$index];
+        $url = $host["url"];
+
+        // go through variable and assign a value
+        foreach ($host["variables"] as $name => $variable) {
+            if (array_key_exists($name, $variables)) { // check to see if it's in the variables provided by the user
+                if (in_array($variables[$name], $variable["enum_values"])) { // check to see if the value is in the enum
+                    $url = str_replace("{".$name."}", $variables[$name], $url);
+                } else {
+                    throw new \InvalidArgumentException("The variable `$name` in the server URL has invalid value ".$variables[$name].". Must be ".join(',', $variable["enum_values"]).".");
+                }
+            } else {
+                // use default value
+                $url = str_replace("{".$name."}", $variable["default_value"], $url);
+            }
+        }
+
+        return $url;
+    }
 }

samples/openapi3/client/petstore/php/OpenAPIClient-php/tests/ConfigurationTest.php

@@ -0,0 +1,56 @@
+<?php
+
+namespace OpenAPI\Client;
+
+use GuzzleHttp\Client;
+use PHPUnit\Framework\TestCase;
+
+class ConfigurationTest extends TestCase
+{
+    /**
+     * Test server settings
+     */
+    public function testMultipleServers()
+    {
+        $config = new Configuration();
+        $servers = $config->getHostSettings();
+
+        $this->assertCount(2, $servers);
+        $this->assertSame("http://{server}.swagger.io:{port}/v2", $servers[0]["url"]);
+        $this->assertSame("petstore", $servers[0]["variables"]["server"]["default_value"]);
+        $this->assertSame("80", $servers[0]["variables"]["port"]["default_value"]);
+        $this->assertSame(array("80", "8080"), $servers[0]["variables"]["port"]["enum_values"]);
+    }
+
+    /**
+     * Test server settings
+     */
+    public function testServerUrl()
+    {
+        $config = new Configuration();
+        // default value
+        $url = $config->getHostFromSettings(0, null);
+        $this->assertSame("http://petstore.swagger.io:80/v2", $url);
+
+        // using a variable
+        $url = $config->getHostFromSettings(0, array("server" => "dev-petstore"));
+        $this->assertSame("http://dev-petstore.swagger.io:80/v2", $url);
+
+        // using 2 variables
+        $url = $config->getHostFromSettings(0, array("server" => "dev-petstore", "port" => "8080"));
+        $this->assertSame("http://dev-petstore.swagger.io:8080/v2", $url);
+    }
+
+    /**
+     * Test server settings with invalid vaues
+     * @expectedException InvalidArgumentException
+     * @expectedExceptionMessage The variable `port` in the server URL has invalid value 8. Must be 80,8080
+     */
+    public function testServerUrlWithInvalidValues()
+    {
+        // using 2 variables with invalid values
+        $config = new Configuration();
+        $url = $config->getHostFromSettings(0, array("server" => "dev-petstore", "port" => "8"));
+        $this->assertSame("http://dev-petstore.swagger.io:8080/v2", $url);
+    }
+}