[Go] Add multiple servers support to Go(-experimental) client

modules/openapi-generator/src/main/resources/go-experimental/configuration.mustache

@@ -2,7 +2,9 @@
 package {{packageName}}
 
 import (
+	"fmt"
 	"net/http"
+	"strings"
 )
 
 // contextKeys are used to identify the type of value in the context.
@@ -41,6 +43,20 @@ type APIKey struct {
 	Prefix string
 }
 
+// ServerVariable stores the information about a server variable
+type ServerVariable struct {
+	Description string
+	DefaultValue string
+	EnumValues []string
+}
+
+// ServerConfiguration stores the information about a server
+type ServerConfiguration struct {
+	Url string
+	Description string
+	Variables map[string]ServerVariable
+}
+
 // Configuration stores the configuration of the API client
 type Configuration struct {
 	BasePath string `json:"basePath,omitempty"`
@@ -49,6 +65,7 @@ type Configuration struct {
 	DefaultHeader map[string]string `json:"defaultHeader,omitempty"`
 	UserAgent string `json:"userAgent,omitempty"`
 	Debug bool `json:"debug,omitempty"`
+	Servers []ServerConfiguration
 	HTTPClient *http.Client
 }
 
@@ -59,6 +76,38 @@ func NewConfiguration() *Configuration {
  DefaultHeader: make(map[string]string),
  UserAgent: "{{#httpUserAgent}}{{{.}}}{{/httpUserAgent}}{{^httpUserAgent}}OpenAPI-Generator/{{{packageVersion}}}/go{{/httpUserAgent}}",
  Debug: false,
+ {{#servers}}
+ {{#-first}}
+ Servers: []ServerConfiguration{{
+ {{/-first}}
+ Url: "{{{url}}}",
+ Description: "{{{description}}}{{^description}}No description provided{{/description}}",
+ {{#variables}}
+ {{#-first}}
+ Variables: map[string]ServerVariable{
+ {{/-first}}
+ "{{{name}}}": ServerVariable{
+ Description: "{{{description}}}{{^description}}No description provided{{/description}}",
+ DefaultValue: "{{{defaultValue}}}",
+ {{#enumValues}}
+ {{#-first}}
+ EnumValues: []string{
+ {{/-first}}
+ "{{{.}}}",
+ {{#-last}}
+ },
+ {{/-last}}
+ {{/enumValues}}
+ },
+ {{#-last}}
+ },
+ {{/-last}}
+ {{/variables}}
+ },
+ {{#-last}}
+ },
+ {{/-last}}
+ {{/servers}}
 	}
 	return cfg
 }
@@ -67,3 +116,31 @@ func NewConfiguration() *Configuration {
 func (c *Configuration) AddDefaultHeader(key string, value string) {
 	c.DefaultHeader[key] = value
 }
+
+// ServerUrl returns URL based on server settings
+func (c *Configuration) ServerUrl(index int, variables map[string]string) (string, error) {
+	if index < 0 || len(c.Servers) <= index {
+ return "", fmt.Errorf("Index %v out of range %v", index, len(c.Servers) - 1)
+	}
+	server := c.Servers[index]
+	url := server.Url
+
+	// go through variables and replace placeholders
+	for name, variable := range server.Variables {
+ if value, ok := variables[name]; ok {
+ found := bool(len(variable.EnumValues) == 0)
+ for _, enumValue := range variable.EnumValues {
+ if value == enumValue {
+ found = true
+ }
+ }
+ if !found {
+ return "", fmt.Errorf("The variable %s in the server URL has invalid value %v. Must be %v", name, value, variable.EnumValues)
+ }
+ url = strings.Replace(url, "{"+name+"}", value, -1)
+ } else {
+ url = strings.Replace(url, "{"+name+"}", variable.DefaultValue, -1)
+ }
+	}
+	return url, nil
+}

modules/openapi-generator/src/main/resources/go/configuration.mustache

@@ -2,7 +2,9 @@
 package {{packageName}}
 
 import (
+	"fmt"
 	"net/http"
+	"strings"
 )
 
 // contextKeys are used to identify the type of value in the context.
@@ -41,6 +43,20 @@ type APIKey struct {
 	Prefix string
 }
 
+// ServerVariable stores the information about a server variable
+type ServerVariable struct {
+	Description string
+	DefaultValue string
+	EnumValues []string
+}
+
+// ServerConfiguration stores the information about a server
+type ServerConfiguration struct {
+	Url string
+	Description string
+	Variables map[string]ServerVariable
+}
+
 // Configuration stores the configuration of the API client
 type Configuration struct {
 	BasePath string `json:"basePath,omitempty"`
@@ -49,6 +65,7 @@ type Configuration struct {
 	DefaultHeader map[string]string `json:"defaultHeader,omitempty"`
 	UserAgent string `json:"userAgent,omitempty"`
 	Debug bool `json:"debug,omitempty"`
+	Servers []ServerConfiguration
 	HTTPClient *http.Client
 }
 
@@ -59,6 +76,38 @@ func NewConfiguration() *Configuration {
  DefaultHeader: make(map[string]string),
  UserAgent: "{{#httpUserAgent}}{{{.}}}{{/httpUserAgent}}{{^httpUserAgent}}OpenAPI-Generator/{{{packageVersion}}}/go{{/httpUserAgent}}",
  Debug: false,
+ {{#servers}}
+ {{#-first}}
+ Servers: []ServerConfiguration{{
+ {{/-first}}
+ Url: "{{{url}}}",
+ Description: "{{{description}}}{{^description}}No description provided{{/description}}",
+ {{#variables}}
+ {{#-first}}
+ Variables: map[string]ServerVariable{
+ {{/-first}}
+ "{{{name}}}": ServerVariable{
+ Description: "{{{description}}}{{^description}}No description provided{{/description}}",
+ DefaultValue: "{{{defaultValue}}}",
+ {{#enumValues}}
+ {{#-first}}
+ EnumValues: []string{
+ {{/-first}}
+ "{{{.}}}",
+ {{#-last}}
+ },
+ {{/-last}}
+ {{/enumValues}}
+ },
+ {{#-last}}
+ },
+ {{/-last}}
+ {{/variables}}
+ },
+ {{#-last}}
+ },
+ {{/-last}}
+ {{/servers}}
 	}
 	return cfg
 }
@@ -67,3 +116,31 @@ func NewConfiguration() *Configuration {
 func (c *Configuration) AddDefaultHeader(key string, value string) {
 	c.DefaultHeader[key] = value
 }
+
+// ServerUrl returns URL based on server settings
+func (c *Configuration) ServerUrl(index int, variables map[string]string) (string, error) {
+	if index < 0 || len(c.Servers) <= index {
+ return "", fmt.Errorf("Index %v out of range %v", index, len(c.Servers) - 1)
+	}
+	server := c.Servers[index]
+	url := server.Url
+
+	// go through variables and replace placeholders
+	for name, variable := range server.Variables {
+ if value, ok := variables[name]; ok {
+ found := bool(len(variable.EnumValues) == 0)
+ for _, enumValue := range variable.EnumValues {
+ if value == enumValue {
+ found = true
+ }
+ }
+ if !found {
+ return "", fmt.Errorf("The variable %s in the server URL has invalid value %v. Must be %v", name, value, variable.EnumValues)
+ }
+ url = strings.Replace(url, "{"+name+"}", value, -1)
+ } else {
+ url = strings.Replace(url, "{"+name+"}", variable.DefaultValue, -1)
+ }
+	}
+	return url, nil
+}

samples/client/petstore/go-experimental/go-petstore/configuration.go

@@ -10,7 +10,9 @@
 package petstore
 
 import (
+	"fmt"
 	"net/http"
+	"strings"
 )
 
 // contextKeys are used to identify the type of value in the context.
@@ -49,6 +51,20 @@ type APIKey struct {
 	Prefix string
 }
 
+// ServerVariable stores the information about a server variable
+type ServerVariable struct {
+	Description string
+	DefaultValue string
+	EnumValues []string
+}
+
+// ServerConfiguration stores the information about a server
+type ServerConfiguration struct {
+	Url string
+	Description string
+	Variables map[string]ServerVariable
+}
+
 // Configuration stores the configuration of the API client
 type Configuration struct {
 	BasePath string `json:"basePath,omitempty"`
@@ -57,6 +73,7 @@ type Configuration struct {
 	DefaultHeader map[string]string `json:"defaultHeader,omitempty"`
 	UserAgent string `json:"userAgent,omitempty"`
 	Debug bool `json:"debug,omitempty"`
+	Servers []ServerConfiguration
 	HTTPClient *http.Client
 }
 
@@ -67,6 +84,11 @@ func NewConfiguration() *Configuration {
  DefaultHeader: make(map[string]string),
  UserAgent: "OpenAPI-Generator/1.0.0/go",
  Debug: false,
+ Servers: []ServerConfiguration{{
+ Url: "http://petstore.swagger.io:80/v2",
+ Description: "No description provided",
+ },
+ },
 	}
 	return cfg
 }
@@ -75,3 +97,31 @@ func NewConfiguration() *Configuration {
 func (c *Configuration) AddDefaultHeader(key string, value string) {
 	c.DefaultHeader[key] = value
 }
+
+// ServerUrl returns URL based on server settings
+func (c *Configuration) ServerUrl(index int, variables map[string]string) (string, error) {
+	if index < 0 || len(c.Servers) <= index {
+ return "", fmt.Errorf("Index %v out of range %v", index, len(c.Servers) - 1)
+	}
+	server := c.Servers[index]
+	url := server.Url
+
+	// go through variables and replace placeholders
+	for name, variable := range server.Variables {
+ if value, ok := variables[name]; ok {
+ found := bool(len(variable.EnumValues) == 0)
+ for _, enumValue := range variable.EnumValues {
+ if value == enumValue {
+ found = true
+ }
+ }
+ if !found {
+ return "", fmt.Errorf("The variable %s in the server URL has invalid value %v. Must be %v", name, value, variable.EnumValues)
+ }
+ url = strings.Replace(url, "{"+name+"}", value, -1)
+ } else {
+ url = strings.Replace(url, "{"+name+"}", variable.DefaultValue, -1)
+ }
+	}
+	return url, nil
+}

modules/openapi-generator/src/main/resources/go-experimental/configuration.mustache

@@ -2,7 +2,9 @@
 package {{packageName}}
 
 import (
+	"fmt"
 	"net/http"
+	"strings"
 )
 
 // contextKeys are used to identify the type of value in the context.
@@ -41,6 +43,20 @@ type APIKey struct {
 	Prefix string
 }
 
+// ServerVariable stores the information about a server variable
+type ServerVariable struct {
+	Description string
+	DefaultValue string
+	EnumValues []string
+}
+
+// ServerConfiguration stores the information about a server
+type ServerConfiguration struct {
+	Url string
+	Description string
+	Variables map[string]ServerVariable
+}
+
 // Configuration stores the configuration of the API client
 type Configuration struct {
 	BasePath string `json:"basePath,omitempty"`
@@ -49,6 +65,7 @@ type Configuration struct {
 	DefaultHeader map[string]string `json:"defaultHeader,omitempty"`
 	UserAgent string `json:"userAgent,omitempty"`
 	Debug bool `json:"debug,omitempty"`
+	Servers []ServerConfiguration
 	HTTPClient *http.Client
 }
 
@@ -59,6 +76,38 @@ func NewConfiguration() *Configuration {
  DefaultHeader: make(map[string]string),
  UserAgent: "{{#httpUserAgent}}{{{.}}}{{/httpUserAgent}}{{^httpUserAgent}}OpenAPI-Generator/{{{packageVersion}}}/go{{/httpUserAgent}}",
  Debug: false,
+ {{#servers}}
+ {{#-first}}
+ Servers: []ServerConfiguration{{
+ {{/-first}}
+ Url: "{{{url}}}",
+ Description: "{{{description}}}{{^description}}No description provided{{/description}}",
+ {{#variables}}
+ {{#-first}}
+ Variables: map[string]ServerVariable{
+ {{/-first}}
+ "{{{name}}}": ServerVariable{
+ Description: "{{{description}}}{{^description}}No description provided{{/description}}",
+ DefaultValue: "{{{defaultValue}}}",
+ {{#enumValues}}
+ {{#-first}}
+ EnumValues: []string{
+ {{/-first}}
+ "{{{.}}}",
+ {{#-last}}
+ },
+ {{/-last}}
+ {{/enumValues}}
+ },
+ {{#-last}}
+ },
+ {{/-last}}
+ {{/variables}}
+ },
+ {{#-last}}
+ },
+ {{/-last}}
+ {{/servers}}
 	}
 	return cfg
 }
@@ -67,3 +116,31 @@ func NewConfiguration() *Configuration {
 func (c *Configuration) AddDefaultHeader(key string, value string) {
 	c.DefaultHeader[key] = value
 }
+
+// ServerUrl returns URL based on server settings
+func (c *Configuration) ServerUrl(index int, variables map[string]string) (string, error) {
+	if index < 0 || len(c.Servers) <= index {
+ return "", fmt.Errorf("Index %v out of range %v", index, len(c.Servers) - 1)
+	}
+	server := c.Servers[index]
+	url := server.Url
+
+	// go through variables and replace placeholders
+	for name, variable := range server.Variables {
+ if value, ok := variables[name]; ok {
+ found := bool(len(variable.EnumValues) == 0)
+ for _, enumValue := range variable.EnumValues {
+ if value == enumValue {
+ found = true
+ }
+ }
+ if !found {
+ return "", fmt.Errorf("The variable %s in the server URL has invalid value %v. Must be %v", name, value, variable.EnumValues)
+ }
+ url = strings.Replace(url, "{"+name+"}", value, -1)
+ } else {
+ url = strings.Replace(url, "{"+name+"}", variable.DefaultValue, -1)
+ }
+	}
+	return url, nil
+}

modules/openapi-generator/src/main/resources/go/configuration.mustache

@@ -2,7 +2,9 @@
 package {{packageName}}
 
 import (
+	"fmt"
 	"net/http"
+	"strings"
 )
 
 // contextKeys are used to identify the type of value in the context.
@@ -41,6 +43,20 @@ type APIKey struct {
 	Prefix string
 }
 
+// ServerVariable stores the information about a server variable
+type ServerVariable struct {
+	Description string
+	DefaultValue string
+	EnumValues []string
+}
+
+// ServerConfiguration stores the information about a server
+type ServerConfiguration struct {
+	Url string
+	Description string
+	Variables map[string]ServerVariable
+}
+
 // Configuration stores the configuration of the API client
 type Configuration struct {
 	BasePath string `json:"basePath,omitempty"`
@@ -49,6 +65,7 @@ type Configuration struct {
 	DefaultHeader map[string]string `json:"defaultHeader,omitempty"`
 	UserAgent string `json:"userAgent,omitempty"`
 	Debug bool `json:"debug,omitempty"`
+	Servers []ServerConfiguration
 	HTTPClient *http.Client
 }
 
@@ -59,6 +76,38 @@ func NewConfiguration() *Configuration {
  DefaultHeader: make(map[string]string),
  UserAgent: "{{#httpUserAgent}}{{{.}}}{{/httpUserAgent}}{{^httpUserAgent}}OpenAPI-Generator/{{{packageVersion}}}/go{{/httpUserAgent}}",
  Debug: false,
+ {{#servers}}
+ {{#-first}}
+ Servers: []ServerConfiguration{{
+ {{/-first}}
+ Url: "{{{url}}}",
+ Description: "{{{description}}}{{^description}}No description provided{{/description}}",
+ {{#variables}}
+ {{#-first}}
+ Variables: map[string]ServerVariable{
+ {{/-first}}
+ "{{{name}}}": ServerVariable{
+ Description: "{{{description}}}{{^description}}No description provided{{/description}}",
+ DefaultValue: "{{{defaultValue}}}",
+ {{#enumValues}}
+ {{#-first}}
+ EnumValues: []string{
+ {{/-first}}
+ "{{{.}}}",
+ {{#-last}}
+ },
+ {{/-last}}
+ {{/enumValues}}
+ },
+ {{#-last}}
+ },
+ {{/-last}}
+ {{/variables}}
+ },
+ {{#-last}}
+ },
+ {{/-last}}
+ {{/servers}}
 	}
 	return cfg
 }
@@ -67,3 +116,31 @@ func NewConfiguration() *Configuration {
 func (c *Configuration) AddDefaultHeader(key string, value string) {
 	c.DefaultHeader[key] = value
 }
+
+// ServerUrl returns URL based on server settings
+func (c *Configuration) ServerUrl(index int, variables map[string]string) (string, error) {
+	if index < 0 || len(c.Servers) <= index {
+ return "", fmt.Errorf("Index %v out of range %v", index, len(c.Servers) - 1)
+	}
+	server := c.Servers[index]
+	url := server.Url
+
+	// go through variables and replace placeholders
+	for name, variable := range server.Variables {
+ if value, ok := variables[name]; ok {
+ found := bool(len(variable.EnumValues) == 0)
+ for _, enumValue := range variable.EnumValues {
+ if value == enumValue {
+ found = true
+ }
+ }
+ if !found {
+ return "", fmt.Errorf("The variable %s in the server URL has invalid value %v. Must be %v", name, value, variable.EnumValues)
+ }
+ url = strings.Replace(url, "{"+name+"}", value, -1)
+ } else {
+ url = strings.Replace(url, "{"+name+"}", variable.DefaultValue, -1)
+ }
+	}
+	return url, nil
+}

samples/client/petstore/go-experimental/go-petstore/configuration.go

@@ -10,7 +10,9 @@
 package petstore
 
 import (
+	"fmt"
 	"net/http"
+	"strings"
 )
 
 // contextKeys are used to identify the type of value in the context.
@@ -49,6 +51,20 @@ type APIKey struct {
 	Prefix string
 }
 
+// ServerVariable stores the information about a server variable
+type ServerVariable struct {
+	Description string
+	DefaultValue string
+	EnumValues []string
+}
+
+// ServerConfiguration stores the information about a server
+type ServerConfiguration struct {
+	Url string
+	Description string
+	Variables map[string]ServerVariable
+}
+
 // Configuration stores the configuration of the API client
 type Configuration struct {
 	BasePath string `json:"basePath,omitempty"`
@@ -57,6 +73,7 @@ type Configuration struct {
 	DefaultHeader map[string]string `json:"defaultHeader,omitempty"`
 	UserAgent string `json:"userAgent,omitempty"`
 	Debug bool `json:"debug,omitempty"`
+	Servers []ServerConfiguration
 	HTTPClient *http.Client
 }
 
@@ -67,6 +84,11 @@ func NewConfiguration() *Configuration {
  DefaultHeader: make(map[string]string),
  UserAgent: "OpenAPI-Generator/1.0.0/go",
  Debug: false,
+ Servers: []ServerConfiguration{{
+ Url: "http://petstore.swagger.io:80/v2",
+ Description: "No description provided",
+ },
+ },
 	}
 	return cfg
 }
@@ -75,3 +97,31 @@ func NewConfiguration() *Configuration {
 func (c *Configuration) AddDefaultHeader(key string, value string) {
 	c.DefaultHeader[key] = value
 }
+
+// ServerUrl returns URL based on server settings
+func (c *Configuration) ServerUrl(index int, variables map[string]string) (string, error) {
+	if index < 0 || len(c.Servers) <= index {
+ return "", fmt.Errorf("Index %v out of range %v", index, len(c.Servers) - 1)
+	}
+	server := c.Servers[index]
+	url := server.Url
+
+	// go through variables and replace placeholders
+	for name, variable := range server.Variables {
+ if value, ok := variables[name]; ok {
+ found := bool(len(variable.EnumValues) == 0)
+ for _, enumValue := range variable.EnumValues {
+ if value == enumValue {
+ found = true
+ }
+ }
+ if !found {
+ return "", fmt.Errorf("The variable %s in the server URL has invalid value %v. Must be %v", name, value, variable.EnumValues)
+ }
+ url = strings.Replace(url, "{"+name+"}", value, -1)
+ } else {
+ url = strings.Replace(url, "{"+name+"}", variable.DefaultValue, -1)
+ }
+	}
+	return url, nil
+}

modules/openapi-generator/src/main/resources/go-experimental/configuration.mustache

@@ -2,7 +2,9 @@
 package {{packageName}}
 
 import (
+	"fmt"
 	"net/http"
+	"strings"
 )
 
 // contextKeys are used to identify the type of value in the context.
@@ -41,6 +43,20 @@ type APIKey struct {
 	Prefix string
 }
 
+// ServerVariable stores the information about a server variable
+type ServerVariable struct {
+	Description string
+	DefaultValue string
+	EnumValues []string
+}
+
+// ServerConfiguration stores the information about a server
+type ServerConfiguration struct {
+	Url string
+	Description string
+	Variables map[string]ServerVariable
+}
+
 // Configuration stores the configuration of the API client
 type Configuration struct {
 	BasePath string `json:"basePath,omitempty"`
@@ -49,6 +65,7 @@ type Configuration struct {
 	DefaultHeader map[string]string `json:"defaultHeader,omitempty"`
 	UserAgent string `json:"userAgent,omitempty"`
 	Debug bool `json:"debug,omitempty"`
+	Servers []ServerConfiguration
 	HTTPClient *http.Client
 }
 
@@ -59,6 +76,38 @@ func NewConfiguration() *Configuration {
  DefaultHeader: make(map[string]string),
  UserAgent: "{{#httpUserAgent}}{{{.}}}{{/httpUserAgent}}{{^httpUserAgent}}OpenAPI-Generator/{{{packageVersion}}}/go{{/httpUserAgent}}",
  Debug: false,
+ {{#servers}}
+ {{#-first}}
+ Servers: []ServerConfiguration{{
+ {{/-first}}
+ Url: "{{{url}}}",
+ Description: "{{{description}}}{{^description}}No description provided{{/description}}",
+ {{#variables}}
+ {{#-first}}
+ Variables: map[string]ServerVariable{
+ {{/-first}}
+ "{{{name}}}": ServerVariable{
+ Description: "{{{description}}}{{^description}}No description provided{{/description}}",
+ DefaultValue: "{{{defaultValue}}}",
+ {{#enumValues}}
+ {{#-first}}
+ EnumValues: []string{
+ {{/-first}}
+ "{{{.}}}",
+ {{#-last}}
+ },
+ {{/-last}}
+ {{/enumValues}}
+ },
+ {{#-last}}
+ },
+ {{/-last}}
+ {{/variables}}
+ },
+ {{#-last}}
+ },
+ {{/-last}}
+ {{/servers}}
 	}
 	return cfg
 }
@@ -67,3 +116,31 @@ func NewConfiguration() *Configuration {
 func (c *Configuration) AddDefaultHeader(key string, value string) {
 	c.DefaultHeader[key] = value
 }
+
+// ServerUrl returns URL based on server settings
+func (c *Configuration) ServerUrl(index int, variables map[string]string) (string, error) {
+	if index < 0 || len(c.Servers) <= index {
+ return "", fmt.Errorf("Index %v out of range %v", index, len(c.Servers) - 1)
+	}
+	server := c.Servers[index]
+	url := server.Url
+
+	// go through variables and replace placeholders
+	for name, variable := range server.Variables {
+ if value, ok := variables[name]; ok {
+ found := bool(len(variable.EnumValues) == 0)
+ for _, enumValue := range variable.EnumValues {
+ if value == enumValue {
+ found = true
+ }
+ }
+ if !found {
+ return "", fmt.Errorf("The variable %s in the server URL has invalid value %v. Must be %v", name, value, variable.EnumValues)
+ }
+ url = strings.Replace(url, "{"+name+"}", value, -1)
+ } else {
+ url = strings.Replace(url, "{"+name+"}", variable.DefaultValue, -1)
+ }
+	}
+	return url, nil
+}

modules/openapi-generator/src/main/resources/go/configuration.mustache

@@ -2,7 +2,9 @@
 package {{packageName}}
 
 import (
+	"fmt"
 	"net/http"
+	"strings"
 )
 
 // contextKeys are used to identify the type of value in the context.
@@ -41,6 +43,20 @@ type APIKey struct {
 	Prefix string
 }
 
+// ServerVariable stores the information about a server variable
+type ServerVariable struct {
+	Description string
+	DefaultValue string
+	EnumValues []string
+}
+
+// ServerConfiguration stores the information about a server
+type ServerConfiguration struct {
+	Url string
+	Description string
+	Variables map[string]ServerVariable
+}
+
 // Configuration stores the configuration of the API client
 type Configuration struct {
 	BasePath string `json:"basePath,omitempty"`
@@ -49,6 +65,7 @@ type Configuration struct {
 	DefaultHeader map[string]string `json:"defaultHeader,omitempty"`
 	UserAgent string `json:"userAgent,omitempty"`
 	Debug bool `json:"debug,omitempty"`
+	Servers []ServerConfiguration
 	HTTPClient *http.Client
 }
 
@@ -59,6 +76,38 @@ func NewConfiguration() *Configuration {
  DefaultHeader: make(map[string]string),
  UserAgent: "{{#httpUserAgent}}{{{.}}}{{/httpUserAgent}}{{^httpUserAgent}}OpenAPI-Generator/{{{packageVersion}}}/go{{/httpUserAgent}}",
  Debug: false,
+ {{#servers}}
+ {{#-first}}
+ Servers: []ServerConfiguration{{
+ {{/-first}}
+ Url: "{{{url}}}",
+ Description: "{{{description}}}{{^description}}No description provided{{/description}}",
+ {{#variables}}
+ {{#-first}}
+ Variables: map[string]ServerVariable{
+ {{/-first}}
+ "{{{name}}}": ServerVariable{
+ Description: "{{{description}}}{{^description}}No description provided{{/description}}",
+ DefaultValue: "{{{defaultValue}}}",
+ {{#enumValues}}
+ {{#-first}}
+ EnumValues: []string{
+ {{/-first}}
+ "{{{.}}}",
+ {{#-last}}
+ },
+ {{/-last}}
+ {{/enumValues}}
+ },
+ {{#-last}}
+ },
+ {{/-last}}
+ {{/variables}}
+ },
+ {{#-last}}
+ },
+ {{/-last}}
+ {{/servers}}
 	}
 	return cfg
 }
@@ -67,3 +116,31 @@ func NewConfiguration() *Configuration {
 func (c *Configuration) AddDefaultHeader(key string, value string) {
 	c.DefaultHeader[key] = value
 }
+
+// ServerUrl returns URL based on server settings
+func (c *Configuration) ServerUrl(index int, variables map[string]string) (string, error) {
+	if index < 0 || len(c.Servers) <= index {
+ return "", fmt.Errorf("Index %v out of range %v", index, len(c.Servers) - 1)
+	}
+	server := c.Servers[index]
+	url := server.Url
+
+	// go through variables and replace placeholders
+	for name, variable := range server.Variables {
+ if value, ok := variables[name]; ok {
+ found := bool(len(variable.EnumValues) == 0)
+ for _, enumValue := range variable.EnumValues {
+ if value == enumValue {
+ found = true
+ }
+ }
+ if !found {
+ return "", fmt.Errorf("The variable %s in the server URL has invalid value %v. Must be %v", name, value, variable.EnumValues)
+ }
+ url = strings.Replace(url, "{"+name+"}", value, -1)
+ } else {
+ url = strings.Replace(url, "{"+name+"}", variable.DefaultValue, -1)
+ }
+	}
+	return url, nil
+}

samples/client/petstore/go-experimental/go-petstore/configuration.go

@@ -10,7 +10,9 @@
 package petstore
 
 import (
+	"fmt"
 	"net/http"
+	"strings"
 )
 
 // contextKeys are used to identify the type of value in the context.
@@ -49,6 +51,20 @@ type APIKey struct {
 	Prefix string
 }
 
+// ServerVariable stores the information about a server variable
+type ServerVariable struct {
+	Description string
+	DefaultValue string
+	EnumValues []string
+}
+
+// ServerConfiguration stores the information about a server
+type ServerConfiguration struct {
+	Url string
+	Description string
+	Variables map[string]ServerVariable
+}
+
 // Configuration stores the configuration of the API client
 type Configuration struct {
 	BasePath string `json:"basePath,omitempty"`
@@ -57,6 +73,7 @@ type Configuration struct {
 	DefaultHeader map[string]string `json:"defaultHeader,omitempty"`
 	UserAgent string `json:"userAgent,omitempty"`
 	Debug bool `json:"debug,omitempty"`
+	Servers []ServerConfiguration
 	HTTPClient *http.Client
 }
 
@@ -67,6 +84,11 @@ func NewConfiguration() *Configuration {
  DefaultHeader: make(map[string]string),
  UserAgent: "OpenAPI-Generator/1.0.0/go",
  Debug: false,
+ Servers: []ServerConfiguration{{
+ Url: "http://petstore.swagger.io:80/v2",
+ Description: "No description provided",
+ },
+ },
 	}
 	return cfg
 }
@@ -75,3 +97,31 @@ func NewConfiguration() *Configuration {
 func (c *Configuration) AddDefaultHeader(key string, value string) {
 	c.DefaultHeader[key] = value
 }
+
+// ServerUrl returns URL based on server settings
+func (c *Configuration) ServerUrl(index int, variables map[string]string) (string, error) {
+	if index < 0 || len(c.Servers) <= index {
+ return "", fmt.Errorf("Index %v out of range %v", index, len(c.Servers) - 1)
+	}
+	server := c.Servers[index]
+	url := server.Url
+
+	// go through variables and replace placeholders
+	for name, variable := range server.Variables {
+ if value, ok := variables[name]; ok {
+ found := bool(len(variable.EnumValues) == 0)
+ for _, enumValue := range variable.EnumValues {
+ if value == enumValue {
+ found = true
+ }
+ }
+ if !found {
+ return "", fmt.Errorf("The variable %s in the server URL has invalid value %v. Must be %v", name, value, variable.EnumValues)
+ }
+ url = strings.Replace(url, "{"+name+"}", value, -1)
+ } else {
+ url = strings.Replace(url, "{"+name+"}", variable.DefaultValue, -1)
+ }
+	}
+	return url, nil
+}

modules/openapi-generator/src/main/resources/go-experimental/configuration.mustache

@@ -2,7 +2,9 @@
 package {{packageName}}
 
 import (
+	"fmt"
 	"net/http"
+	"strings"
 )
 
 // contextKeys are used to identify the type of value in the context.
@@ -41,6 +43,20 @@ type APIKey struct {
 	Prefix string
 }
 
+// ServerVariable stores the information about a server variable
+type ServerVariable struct {
+	Description string
+	DefaultValue string
+	EnumValues []string
+}
+
+// ServerConfiguration stores the information about a server
+type ServerConfiguration struct {
+	Url string
+	Description string
+	Variables map[string]ServerVariable
+}
+
 // Configuration stores the configuration of the API client
 type Configuration struct {
 	BasePath string `json:"basePath,omitempty"`
@@ -49,6 +65,7 @@ type Configuration struct {
 	DefaultHeader map[string]string `json:"defaultHeader,omitempty"`
 	UserAgent string `json:"userAgent,omitempty"`
 	Debug bool `json:"debug,omitempty"`
+	Servers []ServerConfiguration
 	HTTPClient *http.Client
 }
 
@@ -59,6 +76,38 @@ func NewConfiguration() *Configuration {
  DefaultHeader: make(map[string]string),
  UserAgent: "{{#httpUserAgent}}{{{.}}}{{/httpUserAgent}}{{^httpUserAgent}}OpenAPI-Generator/{{{packageVersion}}}/go{{/httpUserAgent}}",
  Debug: false,
+ {{#servers}}
+ {{#-first}}
+ Servers: []ServerConfiguration{{
+ {{/-first}}
+ Url: "{{{url}}}",
+ Description: "{{{description}}}{{^description}}No description provided{{/description}}",
+ {{#variables}}
+ {{#-first}}
+ Variables: map[string]ServerVariable{
+ {{/-first}}
+ "{{{name}}}": ServerVariable{
+ Description: "{{{description}}}{{^description}}No description provided{{/description}}",
+ DefaultValue: "{{{defaultValue}}}",
+ {{#enumValues}}
+ {{#-first}}
+ EnumValues: []string{
+ {{/-first}}
+ "{{{.}}}",
+ {{#-last}}
+ },
+ {{/-last}}
+ {{/enumValues}}
+ },
+ {{#-last}}
+ },
+ {{/-last}}
+ {{/variables}}
+ },
+ {{#-last}}
+ },
+ {{/-last}}
+ {{/servers}}
 	}
 	return cfg
 }
@@ -67,3 +116,31 @@ func NewConfiguration() *Configuration {
 func (c *Configuration) AddDefaultHeader(key string, value string) {
 	c.DefaultHeader[key] = value
 }
+
+// ServerUrl returns URL based on server settings
+func (c *Configuration) ServerUrl(index int, variables map[string]string) (string, error) {
+	if index < 0 || len(c.Servers) <= index {
+ return "", fmt.Errorf("Index %v out of range %v", index, len(c.Servers) - 1)
+	}
+	server := c.Servers[index]
+	url := server.Url
+
+	// go through variables and replace placeholders
+	for name, variable := range server.Variables {
+ if value, ok := variables[name]; ok {
+ found := bool(len(variable.EnumValues) == 0)
+ for _, enumValue := range variable.EnumValues {
+ if value == enumValue {
+ found = true
+ }
+ }
+ if !found {
+ return "", fmt.Errorf("The variable %s in the server URL has invalid value %v. Must be %v", name, value, variable.EnumValues)
+ }
+ url = strings.Replace(url, "{"+name+"}", value, -1)
+ } else {
+ url = strings.Replace(url, "{"+name+"}", variable.DefaultValue, -1)
+ }
+	}
+	return url, nil
+}

modules/openapi-generator/src/main/resources/go/configuration.mustache

@@ -2,7 +2,9 @@
 package {{packageName}}
 
 import (
+	"fmt"
 	"net/http"
+	"strings"
 )
 
 // contextKeys are used to identify the type of value in the context.
@@ -41,6 +43,20 @@ type APIKey struct {
 	Prefix string
 }
 
+// ServerVariable stores the information about a server variable
+type ServerVariable struct {
+	Description string
+	DefaultValue string
+	EnumValues []string
+}
+
+// ServerConfiguration stores the information about a server
+type ServerConfiguration struct {
+	Url string
+	Description string
+	Variables map[string]ServerVariable
+}
+
 // Configuration stores the configuration of the API client
 type Configuration struct {
 	BasePath string `json:"basePath,omitempty"`
@@ -49,6 +65,7 @@ type Configuration struct {
 	DefaultHeader map[string]string `json:"defaultHeader,omitempty"`
 	UserAgent string `json:"userAgent,omitempty"`
 	Debug bool `json:"debug,omitempty"`
+	Servers []ServerConfiguration
 	HTTPClient *http.Client
 }
 
@@ -59,6 +76,38 @@ func NewConfiguration() *Configuration {
  DefaultHeader: make(map[string]string),
  UserAgent: "{{#httpUserAgent}}{{{.}}}{{/httpUserAgent}}{{^httpUserAgent}}OpenAPI-Generator/{{{packageVersion}}}/go{{/httpUserAgent}}",
  Debug: false,
+ {{#servers}}
+ {{#-first}}
+ Servers: []ServerConfiguration{{
+ {{/-first}}
+ Url: "{{{url}}}",
+ Description: "{{{description}}}{{^description}}No description provided{{/description}}",
+ {{#variables}}
+ {{#-first}}
+ Variables: map[string]ServerVariable{
+ {{/-first}}
+ "{{{name}}}": ServerVariable{
+ Description: "{{{description}}}{{^description}}No description provided{{/description}}",
+ DefaultValue: "{{{defaultValue}}}",
+ {{#enumValues}}
+ {{#-first}}
+ EnumValues: []string{
+ {{/-first}}
+ "{{{.}}}",
+ {{#-last}}
+ },
+ {{/-last}}
+ {{/enumValues}}
+ },
+ {{#-last}}
+ },
+ {{/-last}}
+ {{/variables}}
+ },
+ {{#-last}}
+ },
+ {{/-last}}
+ {{/servers}}
 	}
 	return cfg
 }
@@ -67,3 +116,31 @@ func NewConfiguration() *Configuration {
 func (c *Configuration) AddDefaultHeader(key string, value string) {
 	c.DefaultHeader[key] = value
 }
+
+// ServerUrl returns URL based on server settings
+func (c *Configuration) ServerUrl(index int, variables map[string]string) (string, error) {
+	if index < 0 || len(c.Servers) <= index {
+ return "", fmt.Errorf("Index %v out of range %v", index, len(c.Servers) - 1)
+	}
+	server := c.Servers[index]
+	url := server.Url
+
+	// go through variables and replace placeholders
+	for name, variable := range server.Variables {
+ if value, ok := variables[name]; ok {
+ found := bool(len(variable.EnumValues) == 0)
+ for _, enumValue := range variable.EnumValues {
+ if value == enumValue {
+ found = true
+ }
+ }
+ if !found {
+ return "", fmt.Errorf("The variable %s in the server URL has invalid value %v. Must be %v", name, value, variable.EnumValues)
+ }
+ url = strings.Replace(url, "{"+name+"}", value, -1)
+ } else {
+ url = strings.Replace(url, "{"+name+"}", variable.DefaultValue, -1)
+ }
+	}
+	return url, nil
+}

samples/client/petstore/go-experimental/go-petstore/configuration.go

@@ -10,7 +10,9 @@
 package petstore
 
 import (
+	"fmt"
 	"net/http"
+	"strings"
 )
 
 // contextKeys are used to identify the type of value in the context.
@@ -49,6 +51,20 @@ type APIKey struct {
 	Prefix string
 }
 
+// ServerVariable stores the information about a server variable
+type ServerVariable struct {
+	Description string
+	DefaultValue string
+	EnumValues []string
+}
+
+// ServerConfiguration stores the information about a server
+type ServerConfiguration struct {
+	Url string
+	Description string
+	Variables map[string]ServerVariable
+}
+
 // Configuration stores the configuration of the API client
 type Configuration struct {
 	BasePath string `json:"basePath,omitempty"`
@@ -57,6 +73,7 @@ type Configuration struct {
 	DefaultHeader map[string]string `json:"defaultHeader,omitempty"`
 	UserAgent string `json:"userAgent,omitempty"`
 	Debug bool `json:"debug,omitempty"`
+	Servers []ServerConfiguration
 	HTTPClient *http.Client
 }
 
@@ -67,6 +84,11 @@ func NewConfiguration() *Configuration {
  DefaultHeader: make(map[string]string),
  UserAgent: "OpenAPI-Generator/1.0.0/go",
  Debug: false,
+ Servers: []ServerConfiguration{{
+ Url: "http://petstore.swagger.io:80/v2",
+ Description: "No description provided",
+ },
+ },
 	}
 	return cfg
 }
@@ -75,3 +97,31 @@ func NewConfiguration() *Configuration {
 func (c *Configuration) AddDefaultHeader(key string, value string) {
 	c.DefaultHeader[key] = value
 }
+
+// ServerUrl returns URL based on server settings
+func (c *Configuration) ServerUrl(index int, variables map[string]string) (string, error) {
+	if index < 0 || len(c.Servers) <= index {
+ return "", fmt.Errorf("Index %v out of range %v", index, len(c.Servers) - 1)
+	}
+	server := c.Servers[index]
+	url := server.Url
+
+	// go through variables and replace placeholders
+	for name, variable := range server.Variables {
+ if value, ok := variables[name]; ok {
+ found := bool(len(variable.EnumValues) == 0)
+ for _, enumValue := range variable.EnumValues {
+ if value == enumValue {
+ found = true
+ }
+ }
+ if !found {
+ return "", fmt.Errorf("The variable %s in the server URL has invalid value %v. Must be %v", name, value, variable.EnumValues)
+ }
+ url = strings.Replace(url, "{"+name+"}", value, -1)
+ } else {
+ url = strings.Replace(url, "{"+name+"}", variable.DefaultValue, -1)
+ }
+	}
+	return url, nil
+}

modules/openapi-generator/src/main/resources/go-experimental/configuration.mustache

@@ -2,7 +2,9 @@
 package {{packageName}}
 
 import (
+	"fmt"
 	"net/http"
+	"strings"
 )
 
 // contextKeys are used to identify the type of value in the context.
@@ -41,6 +43,20 @@ type APIKey struct {
 	Prefix string
 }
 
+// ServerVariable stores the information about a server variable
+type ServerVariable struct {
+	Description string
+	DefaultValue string
+	EnumValues []string
+}
+
+// ServerConfiguration stores the information about a server
+type ServerConfiguration struct {
+	Url string
+	Description string
+	Variables map[string]ServerVariable
+}
+
 // Configuration stores the configuration of the API client
 type Configuration struct {
 	BasePath string `json:"basePath,omitempty"`
@@ -49,6 +65,7 @@ type Configuration struct {
 	DefaultHeader map[string]string `json:"defaultHeader,omitempty"`
 	UserAgent string `json:"userAgent,omitempty"`
 	Debug bool `json:"debug,omitempty"`
+	Servers []ServerConfiguration
 	HTTPClient *http.Client
 }
 
@@ -59,6 +76,38 @@ func NewConfiguration() *Configuration {
  DefaultHeader: make(map[string]string),
  UserAgent: "{{#httpUserAgent}}{{{.}}}{{/httpUserAgent}}{{^httpUserAgent}}OpenAPI-Generator/{{{packageVersion}}}/go{{/httpUserAgent}}",
  Debug: false,
+ {{#servers}}
+ {{#-first}}
+ Servers: []ServerConfiguration{{
+ {{/-first}}
+ Url: "{{{url}}}",
+ Description: "{{{description}}}{{^description}}No description provided{{/description}}",
+ {{#variables}}
+ {{#-first}}
+ Variables: map[string]ServerVariable{
+ {{/-first}}
+ "{{{name}}}": ServerVariable{
+ Description: "{{{description}}}{{^description}}No description provided{{/description}}",
+ DefaultValue: "{{{defaultValue}}}",
+ {{#enumValues}}
+ {{#-first}}
+ EnumValues: []string{
+ {{/-first}}
+ "{{{.}}}",
+ {{#-last}}
+ },
+ {{/-last}}
+ {{/enumValues}}
+ },
+ {{#-last}}
+ },
+ {{/-last}}
+ {{/variables}}
+ },
+ {{#-last}}
+ },
+ {{/-last}}
+ {{/servers}}
 	}
 	return cfg
 }
@@ -67,3 +116,31 @@ func NewConfiguration() *Configuration {
 func (c *Configuration) AddDefaultHeader(key string, value string) {
 	c.DefaultHeader[key] = value
 }
+
+// ServerUrl returns URL based on server settings
+func (c *Configuration) ServerUrl(index int, variables map[string]string) (string, error) {
+	if index < 0 || len(c.Servers) <= index {
+ return "", fmt.Errorf("Index %v out of range %v", index, len(c.Servers) - 1)
+	}
+	server := c.Servers[index]
+	url := server.Url
+
+	// go through variables and replace placeholders
+	for name, variable := range server.Variables {
+ if value, ok := variables[name]; ok {
+ found := bool(len(variable.EnumValues) == 0)
+ for _, enumValue := range variable.EnumValues {
+ if value == enumValue {
+ found = true
+ }
+ }
+ if !found {
+ return "", fmt.Errorf("The variable %s in the server URL has invalid value %v. Must be %v", name, value, variable.EnumValues)
+ }
+ url = strings.Replace(url, "{"+name+"}", value, -1)
+ } else {
+ url = strings.Replace(url, "{"+name+"}", variable.DefaultValue, -1)
+ }
+	}
+	return url, nil
+}

modules/openapi-generator/src/main/resources/go/configuration.mustache

@@ -2,7 +2,9 @@
 package {{packageName}}
 
 import (
+	"fmt"
 	"net/http"
+	"strings"
 )
 
 // contextKeys are used to identify the type of value in the context.
@@ -41,6 +43,20 @@ type APIKey struct {
 	Prefix string
 }
 
+// ServerVariable stores the information about a server variable
+type ServerVariable struct {
+	Description string
+	DefaultValue string
+	EnumValues []string
+}
+
+// ServerConfiguration stores the information about a server
+type ServerConfiguration struct {
+	Url string
+	Description string
+	Variables map[string]ServerVariable
+}
+
 // Configuration stores the configuration of the API client
 type Configuration struct {
 	BasePath string `json:"basePath,omitempty"`
@@ -49,6 +65,7 @@ type Configuration struct {
 	DefaultHeader map[string]string `json:"defaultHeader,omitempty"`
 	UserAgent string `json:"userAgent,omitempty"`
 	Debug bool `json:"debug,omitempty"`
+	Servers []ServerConfiguration
 	HTTPClient *http.Client
 }
 
@@ -59,6 +76,38 @@ func NewConfiguration() *Configuration {
  DefaultHeader: make(map[string]string),
  UserAgent: "{{#httpUserAgent}}{{{.}}}{{/httpUserAgent}}{{^httpUserAgent}}OpenAPI-Generator/{{{packageVersion}}}/go{{/httpUserAgent}}",
  Debug: false,
+ {{#servers}}
+ {{#-first}}
+ Servers: []ServerConfiguration{{
+ {{/-first}}
+ Url: "{{{url}}}",
+ Description: "{{{description}}}{{^description}}No description provided{{/description}}",
+ {{#variables}}
+ {{#-first}}
+ Variables: map[string]ServerVariable{
+ {{/-first}}
+ "{{{name}}}": ServerVariable{
+ Description: "{{{description}}}{{^description}}No description provided{{/description}}",
+ DefaultValue: "{{{defaultValue}}}",
+ {{#enumValues}}
+ {{#-first}}
+ EnumValues: []string{
+ {{/-first}}
+ "{{{.}}}",
+ {{#-last}}
+ },
+ {{/-last}}
+ {{/enumValues}}
+ },
+ {{#-last}}
+ },
+ {{/-last}}
+ {{/variables}}
+ },
+ {{#-last}}
+ },
+ {{/-last}}
+ {{/servers}}
 	}
 	return cfg
 }
@@ -67,3 +116,31 @@ func NewConfiguration() *Configuration {
 func (c *Configuration) AddDefaultHeader(key string, value string) {
 	c.DefaultHeader[key] = value
 }
+
+// ServerUrl returns URL based on server settings
+func (c *Configuration) ServerUrl(index int, variables map[string]string) (string, error) {
+	if index < 0 || len(c.Servers) <= index {
+ return "", fmt.Errorf("Index %v out of range %v", index, len(c.Servers) - 1)
+	}
+	server := c.Servers[index]
+	url := server.Url
+
+	// go through variables and replace placeholders
+	for name, variable := range server.Variables {
+ if value, ok := variables[name]; ok {
+ found := bool(len(variable.EnumValues) == 0)
+ for _, enumValue := range variable.EnumValues {
+ if value == enumValue {
+ found = true
+ }
+ }
+ if !found {
+ return "", fmt.Errorf("The variable %s in the server URL has invalid value %v. Must be %v", name, value, variable.EnumValues)
+ }
+ url = strings.Replace(url, "{"+name+"}", value, -1)
+ } else {
+ url = strings.Replace(url, "{"+name+"}", variable.DefaultValue, -1)
+ }
+	}
+	return url, nil
+}

samples/client/petstore/go-experimental/go-petstore/configuration.go

@@ -10,7 +10,9 @@
 package petstore
 
 import (
+	"fmt"
 	"net/http"
+	"strings"
 )
 
 // contextKeys are used to identify the type of value in the context.
@@ -49,6 +51,20 @@ type APIKey struct {
 	Prefix string
 }
 
+// ServerVariable stores the information about a server variable
+type ServerVariable struct {
+	Description string
+	DefaultValue string
+	EnumValues []string
+}
+
+// ServerConfiguration stores the information about a server
+type ServerConfiguration struct {
+	Url string
+	Description string
+	Variables map[string]ServerVariable
+}
+
 // Configuration stores the configuration of the API client
 type Configuration struct {
 	BasePath string `json:"basePath,omitempty"`
@@ -57,6 +73,7 @@ type Configuration struct {
 	DefaultHeader map[string]string `json:"defaultHeader,omitempty"`
 	UserAgent string `json:"userAgent,omitempty"`
 	Debug bool `json:"debug,omitempty"`
+	Servers []ServerConfiguration
 	HTTPClient *http.Client
 }
 
@@ -67,6 +84,11 @@ func NewConfiguration() *Configuration {
  DefaultHeader: make(map[string]string),
  UserAgent: "OpenAPI-Generator/1.0.0/go",
  Debug: false,
+ Servers: []ServerConfiguration{{
+ Url: "http://petstore.swagger.io:80/v2",
+ Description: "No description provided",
+ },
+ },
 	}
 	return cfg
 }
@@ -75,3 +97,31 @@ func NewConfiguration() *Configuration {
 func (c *Configuration) AddDefaultHeader(key string, value string) {
 	c.DefaultHeader[key] = value
 }
+
+// ServerUrl returns URL based on server settings
+func (c *Configuration) ServerUrl(index int, variables map[string]string) (string, error) {
+	if index < 0 || len(c.Servers) <= index {
+ return "", fmt.Errorf("Index %v out of range %v", index, len(c.Servers) - 1)
+	}
+	server := c.Servers[index]
+	url := server.Url
+
+	// go through variables and replace placeholders
+	for name, variable := range server.Variables {
+ if value, ok := variables[name]; ok {
+ found := bool(len(variable.EnumValues) == 0)
+ for _, enumValue := range variable.EnumValues {
+ if value == enumValue {
+ found = true
+ }
+ }
+ if !found {
+ return "", fmt.Errorf("The variable %s in the server URL has invalid value %v. Must be %v", name, value, variable.EnumValues)
+ }
+ url = strings.Replace(url, "{"+name+"}", value, -1)
+ } else {
+ url = strings.Replace(url, "{"+name+"}", variable.DefaultValue, -1)
+ }
+	}
+	return url, nil
+}

modules/openapi-generator/src/main/resources/go-experimental/configuration.mustache

@@ -2,7 +2,9 @@
 package {{packageName}}
 
 import (
+	"fmt"
 	"net/http"
+	"strings"
 )
 
 // contextKeys are used to identify the type of value in the context.
@@ -41,6 +43,20 @@ type APIKey struct {
 	Prefix string
 }
 
+// ServerVariable stores the information about a server variable
+type ServerVariable struct {
+	Description string
+	DefaultValue string
+	EnumValues []string
+}
+
+// ServerConfiguration stores the information about a server
+type ServerConfiguration struct {
+	Url string
+	Description string
+	Variables map[string]ServerVariable
+}
+
 // Configuration stores the configuration of the API client
 type Configuration struct {
 	BasePath string `json:"basePath,omitempty"`
@@ -49,6 +65,7 @@ type Configuration struct {
 	DefaultHeader map[string]string `json:"defaultHeader,omitempty"`
 	UserAgent string `json:"userAgent,omitempty"`
 	Debug bool `json:"debug,omitempty"`
+	Servers []ServerConfiguration
 	HTTPClient *http.Client
 }
 
@@ -59,6 +76,38 @@ func NewConfiguration() *Configuration {
  DefaultHeader: make(map[string]string),
  UserAgent: "{{#httpUserAgent}}{{{.}}}{{/httpUserAgent}}{{^httpUserAgent}}OpenAPI-Generator/{{{packageVersion}}}/go{{/httpUserAgent}}",
  Debug: false,
+ {{#servers}}
+ {{#-first}}
+ Servers: []ServerConfiguration{{
+ {{/-first}}
+ Url: "{{{url}}}",
+ Description: "{{{description}}}{{^description}}No description provided{{/description}}",
+ {{#variables}}
+ {{#-first}}
+ Variables: map[string]ServerVariable{
+ {{/-first}}
+ "{{{name}}}": ServerVariable{
+ Description: "{{{description}}}{{^description}}No description provided{{/description}}",
+ DefaultValue: "{{{defaultValue}}}",
+ {{#enumValues}}
+ {{#-first}}
+ EnumValues: []string{
+ {{/-first}}
+ "{{{.}}}",
+ {{#-last}}
+ },
+ {{/-last}}
+ {{/enumValues}}
+ },
+ {{#-last}}
+ },
+ {{/-last}}
+ {{/variables}}
+ },
+ {{#-last}}
+ },
+ {{/-last}}
+ {{/servers}}
 	}
 	return cfg
 }
@@ -67,3 +116,31 @@ func NewConfiguration() *Configuration {
 func (c *Configuration) AddDefaultHeader(key string, value string) {
 	c.DefaultHeader[key] = value
 }
+
+// ServerUrl returns URL based on server settings
+func (c *Configuration) ServerUrl(index int, variables map[string]string) (string, error) {
+	if index < 0 || len(c.Servers) <= index {
+ return "", fmt.Errorf("Index %v out of range %v", index, len(c.Servers) - 1)
+	}
+	server := c.Servers[index]
+	url := server.Url
+
+	// go through variables and replace placeholders
+	for name, variable := range server.Variables {
+ if value, ok := variables[name]; ok {
+ found := bool(len(variable.EnumValues) == 0)
+ for _, enumValue := range variable.EnumValues {
+ if value == enumValue {
+ found = true
+ }
+ }
+ if !found {
+ return "", fmt.Errorf("The variable %s in the server URL has invalid value %v. Must be %v", name, value, variable.EnumValues)
+ }
+ url = strings.Replace(url, "{"+name+"}", value, -1)
+ } else {
+ url = strings.Replace(url, "{"+name+"}", variable.DefaultValue, -1)
+ }
+	}
+	return url, nil
+}

modules/openapi-generator/src/main/resources/go/configuration.mustache

@@ -2,7 +2,9 @@
 package {{packageName}}
 
 import (
+	"fmt"
 	"net/http"
+	"strings"
 )
 
 // contextKeys are used to identify the type of value in the context.
@@ -41,6 +43,20 @@ type APIKey struct {
 	Prefix string
 }
 
+// ServerVariable stores the information about a server variable
+type ServerVariable struct {
+	Description string
+	DefaultValue string
+	EnumValues []string
+}
+
+// ServerConfiguration stores the information about a server
+type ServerConfiguration struct {
+	Url string
+	Description string
+	Variables map[string]ServerVariable
+}
+
 // Configuration stores the configuration of the API client
 type Configuration struct {
 	BasePath string `json:"basePath,omitempty"`
@@ -49,6 +65,7 @@ type Configuration struct {
 	DefaultHeader map[string]string `json:"defaultHeader,omitempty"`
 	UserAgent string `json:"userAgent,omitempty"`
 	Debug bool `json:"debug,omitempty"`
+	Servers []ServerConfiguration
 	HTTPClient *http.Client
 }
 
@@ -59,6 +76,38 @@ func NewConfiguration() *Configuration {
  DefaultHeader: make(map[string]string),
  UserAgent: "{{#httpUserAgent}}{{{.}}}{{/httpUserAgent}}{{^httpUserAgent}}OpenAPI-Generator/{{{packageVersion}}}/go{{/httpUserAgent}}",
  Debug: false,
+ {{#servers}}
+ {{#-first}}
+ Servers: []ServerConfiguration{{
+ {{/-first}}
+ Url: "{{{url}}}",
+ Description: "{{{description}}}{{^description}}No description provided{{/description}}",
+ {{#variables}}
+ {{#-first}}
+ Variables: map[string]ServerVariable{
+ {{/-first}}
+ "{{{name}}}": ServerVariable{
+ Description: "{{{description}}}{{^description}}No description provided{{/description}}",
+ DefaultValue: "{{{defaultValue}}}",
+ {{#enumValues}}
+ {{#-first}}
+ EnumValues: []string{
+ {{/-first}}
+ "{{{.}}}",
+ {{#-last}}
+ },
+ {{/-last}}
+ {{/enumValues}}
+ },
+ {{#-last}}
+ },
+ {{/-last}}
+ {{/variables}}
+ },
+ {{#-last}}
+ },
+ {{/-last}}
+ {{/servers}}
 	}
 	return cfg
 }
@@ -67,3 +116,31 @@ func NewConfiguration() *Configuration {
 func (c *Configuration) AddDefaultHeader(key string, value string) {
 	c.DefaultHeader[key] = value
 }
+
+// ServerUrl returns URL based on server settings
+func (c *Configuration) ServerUrl(index int, variables map[string]string) (string, error) {
+	if index < 0 || len(c.Servers) <= index {
+ return "", fmt.Errorf("Index %v out of range %v", index, len(c.Servers) - 1)
+	}
+	server := c.Servers[index]
+	url := server.Url
+
+	// go through variables and replace placeholders
+	for name, variable := range server.Variables {
+ if value, ok := variables[name]; ok {
+ found := bool(len(variable.EnumValues) == 0)
+ for _, enumValue := range variable.EnumValues {
+ if value == enumValue {
+ found = true
+ }
+ }
+ if !found {
+ return "", fmt.Errorf("The variable %s in the server URL has invalid value %v. Must be %v", name, value, variable.EnumValues)
+ }
+ url = strings.Replace(url, "{"+name+"}", value, -1)
+ } else {
+ url = strings.Replace(url, "{"+name+"}", variable.DefaultValue, -1)
+ }
+	}
+	return url, nil
+}

samples/client/petstore/go-experimental/go-petstore/configuration.go

@@ -10,7 +10,9 @@
 package petstore
 
 import (
+	"fmt"
 	"net/http"
+	"strings"
 )
 
 // contextKeys are used to identify the type of value in the context.
@@ -49,6 +51,20 @@ type APIKey struct {
 	Prefix string
 }
 
+// ServerVariable stores the information about a server variable
+type ServerVariable struct {
+	Description string
+	DefaultValue string
+	EnumValues []string
+}
+
+// ServerConfiguration stores the information about a server
+type ServerConfiguration struct {
+	Url string
+	Description string
+	Variables map[string]ServerVariable
+}
+
 // Configuration stores the configuration of the API client
 type Configuration struct {
 	BasePath string `json:"basePath,omitempty"`
@@ -57,6 +73,7 @@ type Configuration struct {
 	DefaultHeader map[string]string `json:"defaultHeader,omitempty"`
 	UserAgent string `json:"userAgent,omitempty"`
 	Debug bool `json:"debug,omitempty"`
+	Servers []ServerConfiguration
 	HTTPClient *http.Client
 }
 
@@ -67,6 +84,11 @@ func NewConfiguration() *Configuration {
  DefaultHeader: make(map[string]string),
  UserAgent: "OpenAPI-Generator/1.0.0/go",
  Debug: false,
+ Servers: []ServerConfiguration{{
+ Url: "http://petstore.swagger.io:80/v2",
+ Description: "No description provided",
+ },
+ },
 	}
 	return cfg
 }
@@ -75,3 +97,31 @@ func NewConfiguration() *Configuration {
 func (c *Configuration) AddDefaultHeader(key string, value string) {
 	c.DefaultHeader[key] = value
 }
+
+// ServerUrl returns URL based on server settings
+func (c *Configuration) ServerUrl(index int, variables map[string]string) (string, error) {
+	if index < 0 || len(c.Servers) <= index {
+ return "", fmt.Errorf("Index %v out of range %v", index, len(c.Servers) - 1)
+	}
+	server := c.Servers[index]
+	url := server.Url
+
+	// go through variables and replace placeholders
+	for name, variable := range server.Variables {
+ if value, ok := variables[name]; ok {
+ found := bool(len(variable.EnumValues) == 0)
+ for _, enumValue := range variable.EnumValues {
+ if value == enumValue {
+ found = true
+ }
+ }
+ if !found {
+ return "", fmt.Errorf("The variable %s in the server URL has invalid value %v. Must be %v", name, value, variable.EnumValues)
+ }
+ url = strings.Replace(url, "{"+name+"}", value, -1)
+ } else {
+ url = strings.Replace(url, "{"+name+"}", variable.DefaultValue, -1)
+ }
+	}
+	return url, nil
+}

modules/openapi-generator/src/main/resources/go-experimental/configuration.mustache

@@ -2,7 +2,9 @@
 package {{packageName}}
 
 import (
+	"fmt"
 	"net/http"
+	"strings"
 )
 
 // contextKeys are used to identify the type of value in the context.
@@ -41,6 +43,20 @@ type APIKey struct {
 	Prefix string
 }
 
+// ServerVariable stores the information about a server variable
+type ServerVariable struct {
+	Description string
+	DefaultValue string
+	EnumValues []string
+}
+
+// ServerConfiguration stores the information about a server
+type ServerConfiguration struct {
+	Url string
+	Description string
+	Variables map[string]ServerVariable
+}
+
 // Configuration stores the configuration of the API client
 type Configuration struct {
 	BasePath string `json:"basePath,omitempty"`
@@ -49,6 +65,7 @@ type Configuration struct {
 	DefaultHeader map[string]string `json:"defaultHeader,omitempty"`
 	UserAgent string `json:"userAgent,omitempty"`
 	Debug bool `json:"debug,omitempty"`
+	Servers []ServerConfiguration
 	HTTPClient *http.Client
 }
 
@@ -59,6 +76,38 @@ func NewConfiguration() *Configuration {
  DefaultHeader: make(map[string]string),
  UserAgent: "{{#httpUserAgent}}{{{.}}}{{/httpUserAgent}}{{^httpUserAgent}}OpenAPI-Generator/{{{packageVersion}}}/go{{/httpUserAgent}}",
  Debug: false,
+ {{#servers}}
+ {{#-first}}
+ Servers: []ServerConfiguration{{
+ {{/-first}}
+ Url: "{{{url}}}",
+ Description: "{{{description}}}{{^description}}No description provided{{/description}}",
+ {{#variables}}
+ {{#-first}}
+ Variables: map[string]ServerVariable{
+ {{/-first}}
+ "{{{name}}}": ServerVariable{
+ Description: "{{{description}}}{{^description}}No description provided{{/description}}",
+ DefaultValue: "{{{defaultValue}}}",
+ {{#enumValues}}
+ {{#-first}}
+ EnumValues: []string{
+ {{/-first}}
+ "{{{.}}}",
+ {{#-last}}
+ },
+ {{/-last}}
+ {{/enumValues}}
+ },
+ {{#-last}}
+ },
+ {{/-last}}
+ {{/variables}}
+ },
+ {{#-last}}
+ },
+ {{/-last}}
+ {{/servers}}
 	}
 	return cfg
 }
@@ -67,3 +116,31 @@ func NewConfiguration() *Configuration {
 func (c *Configuration) AddDefaultHeader(key string, value string) {
 	c.DefaultHeader[key] = value
 }
+
+// ServerUrl returns URL based on server settings
+func (c *Configuration) ServerUrl(index int, variables map[string]string) (string, error) {
+	if index < 0 || len(c.Servers) <= index {
+ return "", fmt.Errorf("Index %v out of range %v", index, len(c.Servers) - 1)
+	}
+	server := c.Servers[index]
+	url := server.Url
+
+	// go through variables and replace placeholders
+	for name, variable := range server.Variables {
+ if value, ok := variables[name]; ok {
+ found := bool(len(variable.EnumValues) == 0)
+ for _, enumValue := range variable.EnumValues {
+ if value == enumValue {
+ found = true
+ }
+ }
+ if !found {
+ return "", fmt.Errorf("The variable %s in the server URL has invalid value %v. Must be %v", name, value, variable.EnumValues)
+ }
+ url = strings.Replace(url, "{"+name+"}", value, -1)
+ } else {
+ url = strings.Replace(url, "{"+name+"}", variable.DefaultValue, -1)
+ }
+	}
+	return url, nil
+}

modules/openapi-generator/src/main/resources/go/configuration.mustache

@@ -2,7 +2,9 @@
 package {{packageName}}
 
 import (
+	"fmt"
 	"net/http"
+	"strings"
 )
 
 // contextKeys are used to identify the type of value in the context.
@@ -41,6 +43,20 @@ type APIKey struct {
 	Prefix string
 }
 
+// ServerVariable stores the information about a server variable
+type ServerVariable struct {
+	Description string
+	DefaultValue string
+	EnumValues []string
+}
+
+// ServerConfiguration stores the information about a server
+type ServerConfiguration struct {
+	Url string
+	Description string
+	Variables map[string]ServerVariable
+}
+
 // Configuration stores the configuration of the API client
 type Configuration struct {
 	BasePath string `json:"basePath,omitempty"`
@@ -49,6 +65,7 @@ type Configuration struct {
 	DefaultHeader map[string]string `json:"defaultHeader,omitempty"`
 	UserAgent string `json:"userAgent,omitempty"`
 	Debug bool `json:"debug,omitempty"`
+	Servers []ServerConfiguration
 	HTTPClient *http.Client
 }
 
@@ -59,6 +76,38 @@ func NewConfiguration() *Configuration {
  DefaultHeader: make(map[string]string),
  UserAgent: "{{#httpUserAgent}}{{{.}}}{{/httpUserAgent}}{{^httpUserAgent}}OpenAPI-Generator/{{{packageVersion}}}/go{{/httpUserAgent}}",
  Debug: false,
+ {{#servers}}
+ {{#-first}}
+ Servers: []ServerConfiguration{{
+ {{/-first}}
+ Url: "{{{url}}}",
+ Description: "{{{description}}}{{^description}}No description provided{{/description}}",
+ {{#variables}}
+ {{#-first}}
+ Variables: map[string]ServerVariable{
+ {{/-first}}
+ "{{{name}}}": ServerVariable{
+ Description: "{{{description}}}{{^description}}No description provided{{/description}}",
+ DefaultValue: "{{{defaultValue}}}",
+ {{#enumValues}}
+ {{#-first}}
+ EnumValues: []string{
+ {{/-first}}
+ "{{{.}}}",
+ {{#-last}}
+ },
+ {{/-last}}
+ {{/enumValues}}
+ },
+ {{#-last}}
+ },
+ {{/-last}}
+ {{/variables}}
+ },
+ {{#-last}}
+ },
+ {{/-last}}
+ {{/servers}}
 	}
 	return cfg
 }
@@ -67,3 +116,31 @@ func NewConfiguration() *Configuration {
 func (c *Configuration) AddDefaultHeader(key string, value string) {
 	c.DefaultHeader[key] = value
 }
+
+// ServerUrl returns URL based on server settings
+func (c *Configuration) ServerUrl(index int, variables map[string]string) (string, error) {
+	if index < 0 || len(c.Servers) <= index {
+ return "", fmt.Errorf("Index %v out of range %v", index, len(c.Servers) - 1)
+	}
+	server := c.Servers[index]
+	url := server.Url
+
+	// go through variables and replace placeholders
+	for name, variable := range server.Variables {
+ if value, ok := variables[name]; ok {
+ found := bool(len(variable.EnumValues) == 0)
+ for _, enumValue := range variable.EnumValues {
+ if value == enumValue {
+ found = true
+ }
+ }
+ if !found {
+ return "", fmt.Errorf("The variable %s in the server URL has invalid value %v. Must be %v", name, value, variable.EnumValues)
+ }
+ url = strings.Replace(url, "{"+name+"}", value, -1)
+ } else {
+ url = strings.Replace(url, "{"+name+"}", variable.DefaultValue, -1)
+ }
+	}
+	return url, nil
+}

samples/client/petstore/go-experimental/go-petstore/configuration.go

@@ -10,7 +10,9 @@
 package petstore
 
 import (
+	"fmt"
 	"net/http"
+	"strings"
 )
 
 // contextKeys are used to identify the type of value in the context.
@@ -49,6 +51,20 @@ type APIKey struct {
 	Prefix string
 }
 
+// ServerVariable stores the information about a server variable
+type ServerVariable struct {
+	Description string
+	DefaultValue string
+	EnumValues []string
+}
+
+// ServerConfiguration stores the information about a server
+type ServerConfiguration struct {
+	Url string
+	Description string
+	Variables map[string]ServerVariable
+}
+
 // Configuration stores the configuration of the API client
 type Configuration struct {
 	BasePath string `json:"basePath,omitempty"`
@@ -57,6 +73,7 @@ type Configuration struct {
 	DefaultHeader map[string]string `json:"defaultHeader,omitempty"`
 	UserAgent string `json:"userAgent,omitempty"`
 	Debug bool `json:"debug,omitempty"`
+	Servers []ServerConfiguration
 	HTTPClient *http.Client
 }
 
@@ -67,6 +84,11 @@ func NewConfiguration() *Configuration {
  DefaultHeader: make(map[string]string),
  UserAgent: "OpenAPI-Generator/1.0.0/go",
  Debug: false,
+ Servers: []ServerConfiguration{{
+ Url: "http://petstore.swagger.io:80/v2",
+ Description: "No description provided",
+ },
+ },
 	}
 	return cfg
 }
@@ -75,3 +97,31 @@ func NewConfiguration() *Configuration {
 func (c *Configuration) AddDefaultHeader(key string, value string) {
 	c.DefaultHeader[key] = value
 }
+
+// ServerUrl returns URL based on server settings
+func (c *Configuration) ServerUrl(index int, variables map[string]string) (string, error) {
+	if index < 0 || len(c.Servers) <= index {
+ return "", fmt.Errorf("Index %v out of range %v", index, len(c.Servers) - 1)
+	}
+	server := c.Servers[index]
+	url := server.Url
+
+	// go through variables and replace placeholders
+	for name, variable := range server.Variables {
+ if value, ok := variables[name]; ok {
+ found := bool(len(variable.EnumValues) == 0)
+ for _, enumValue := range variable.EnumValues {
+ if value == enumValue {
+ found = true
+ }
+ }
+ if !found {
+ return "", fmt.Errorf("The variable %s in the server URL has invalid value %v. Must be %v", name, value, variable.EnumValues)
+ }
+ url = strings.Replace(url, "{"+name+"}", value, -1)
+ } else {
+ url = strings.Replace(url, "{"+name+"}", variable.DefaultValue, -1)
+ }
+	}
+	return url, nil
+}

modules/openapi-generator/src/main/resources/go-experimental/configuration.mustache

@@ -2,7 +2,9 @@
 package {{packageName}}
 
 import (
+	"fmt"
 	"net/http"
+	"strings"
 )
 
 // contextKeys are used to identify the type of value in the context.
@@ -41,6 +43,20 @@ type APIKey struct {
 	Prefix string
 }
 
+// ServerVariable stores the information about a server variable
+type ServerVariable struct {
+	Description string
+	DefaultValue string
+	EnumValues []string
+}
+
+// ServerConfiguration stores the information about a server
+type ServerConfiguration struct {
+	Url string
+	Description string
+	Variables map[string]ServerVariable
+}
+
 // Configuration stores the configuration of the API client
 type Configuration struct {
 	BasePath string `json:"basePath,omitempty"`
@@ -49,6 +65,7 @@ type Configuration struct {
 	DefaultHeader map[string]string `json:"defaultHeader,omitempty"`
 	UserAgent string `json:"userAgent,omitempty"`
 	Debug bool `json:"debug,omitempty"`
+	Servers []ServerConfiguration
 	HTTPClient *http.Client
 }
 
@@ -59,6 +76,38 @@ func NewConfiguration() *Configuration {
  DefaultHeader: make(map[string]string),
  UserAgent: "{{#httpUserAgent}}{{{.}}}{{/httpUserAgent}}{{^httpUserAgent}}OpenAPI-Generator/{{{packageVersion}}}/go{{/httpUserAgent}}",
  Debug: false,
+ {{#servers}}
+ {{#-first}}
+ Servers: []ServerConfiguration{{
+ {{/-first}}
+ Url: "{{{url}}}",
+ Description: "{{{description}}}{{^description}}No description provided{{/description}}",
+ {{#variables}}
+ {{#-first}}
+ Variables: map[string]ServerVariable{
+ {{/-first}}
+ "{{{name}}}": ServerVariable{
+ Description: "{{{description}}}{{^description}}No description provided{{/description}}",
+ DefaultValue: "{{{defaultValue}}}",
+ {{#enumValues}}
+ {{#-first}}
+ EnumValues: []string{
+ {{/-first}}
+ "{{{.}}}",
+ {{#-last}}
+ },
+ {{/-last}}
+ {{/enumValues}}
+ },
+ {{#-last}}
+ },
+ {{/-last}}
+ {{/variables}}
+ },
+ {{#-last}}
+ },
+ {{/-last}}
+ {{/servers}}
 	}
 	return cfg
 }
@@ -67,3 +116,31 @@ func NewConfiguration() *Configuration {
 func (c *Configuration) AddDefaultHeader(key string, value string) {
 	c.DefaultHeader[key] = value
 }
+
+// ServerUrl returns URL based on server settings
+func (c *Configuration) ServerUrl(index int, variables map[string]string) (string, error) {
+	if index < 0 || len(c.Servers) <= index {
+ return "", fmt.Errorf("Index %v out of range %v", index, len(c.Servers) - 1)
+	}
+	server := c.Servers[index]
+	url := server.Url
+
+	// go through variables and replace placeholders
+	for name, variable := range server.Variables {
+ if value, ok := variables[name]; ok {
+ found := bool(len(variable.EnumValues) == 0)
+ for _, enumValue := range variable.EnumValues {
+ if value == enumValue {
+ found = true
+ }
+ }
+ if !found {
+ return "", fmt.Errorf("The variable %s in the server URL has invalid value %v. Must be %v", name, value, variable.EnumValues)
+ }
+ url = strings.Replace(url, "{"+name+"}", value, -1)
+ } else {
+ url = strings.Replace(url, "{"+name+"}", variable.DefaultValue, -1)
+ }
+	}
+	return url, nil
+}

modules/openapi-generator/src/main/resources/go/configuration.mustache

@@ -2,7 +2,9 @@
 package {{packageName}}
 
 import (
+	"fmt"
 	"net/http"
+	"strings"
 )
 
 // contextKeys are used to identify the type of value in the context.
@@ -41,6 +43,20 @@ type APIKey struct {
 	Prefix string
 }
 
+// ServerVariable stores the information about a server variable
+type ServerVariable struct {
+	Description string
+	DefaultValue string
+	EnumValues []string
+}
+
+// ServerConfiguration stores the information about a server
+type ServerConfiguration struct {
+	Url string
+	Description string
+	Variables map[string]ServerVariable
+}
+
 // Configuration stores the configuration of the API client
 type Configuration struct {
 	BasePath string `json:"basePath,omitempty"`
@@ -49,6 +65,7 @@ type Configuration struct {
 	DefaultHeader map[string]string `json:"defaultHeader,omitempty"`
 	UserAgent string `json:"userAgent,omitempty"`
 	Debug bool `json:"debug,omitempty"`
+	Servers []ServerConfiguration
 	HTTPClient *http.Client
 }
 
@@ -59,6 +76,38 @@ func NewConfiguration() *Configuration {
  DefaultHeader: make(map[string]string),
  UserAgent: "{{#httpUserAgent}}{{{.}}}{{/httpUserAgent}}{{^httpUserAgent}}OpenAPI-Generator/{{{packageVersion}}}/go{{/httpUserAgent}}",
  Debug: false,
+ {{#servers}}
+ {{#-first}}
+ Servers: []ServerConfiguration{{
+ {{/-first}}
+ Url: "{{{url}}}",
+ Description: "{{{description}}}{{^description}}No description provided{{/description}}",
+ {{#variables}}
+ {{#-first}}
+ Variables: map[string]ServerVariable{
+ {{/-first}}
+ "{{{name}}}": ServerVariable{
+ Description: "{{{description}}}{{^description}}No description provided{{/description}}",
+ DefaultValue: "{{{defaultValue}}}",
+ {{#enumValues}}
+ {{#-first}}
+ EnumValues: []string{
+ {{/-first}}
+ "{{{.}}}",
+ {{#-last}}
+ },
+ {{/-last}}
+ {{/enumValues}}
+ },
+ {{#-last}}
+ },
+ {{/-last}}
+ {{/variables}}
+ },
+ {{#-last}}
+ },
+ {{/-last}}
+ {{/servers}}
 	}
 	return cfg
 }
@@ -67,3 +116,31 @@ func NewConfiguration() *Configuration {
 func (c *Configuration) AddDefaultHeader(key string, value string) {
 	c.DefaultHeader[key] = value
 }
+
+// ServerUrl returns URL based on server settings
+func (c *Configuration) ServerUrl(index int, variables map[string]string) (string, error) {
+	if index < 0 || len(c.Servers) <= index {
+ return "", fmt.Errorf("Index %v out of range %v", index, len(c.Servers) - 1)
+	}
+	server := c.Servers[index]
+	url := server.Url
+
+	// go through variables and replace placeholders
+	for name, variable := range server.Variables {
+ if value, ok := variables[name]; ok {
+ found := bool(len(variable.EnumValues) == 0)
+ for _, enumValue := range variable.EnumValues {
+ if value == enumValue {
+ found = true
+ }
+ }
+ if !found {
+ return "", fmt.Errorf("The variable %s in the server URL has invalid value %v. Must be %v", name, value, variable.EnumValues)
+ }
+ url = strings.Replace(url, "{"+name+"}", value, -1)
+ } else {
+ url = strings.Replace(url, "{"+name+"}", variable.DefaultValue, -1)
+ }
+	}
+	return url, nil
+}

samples/client/petstore/go-experimental/go-petstore/configuration.go

@@ -10,7 +10,9 @@
 package petstore
 
 import (
+	"fmt"
 	"net/http"
+	"strings"
 )
 
 // contextKeys are used to identify the type of value in the context.
@@ -49,6 +51,20 @@ type APIKey struct {
 	Prefix string
 }
 
+// ServerVariable stores the information about a server variable
+type ServerVariable struct {
+	Description string
+	DefaultValue string
+	EnumValues []string
+}
+
+// ServerConfiguration stores the information about a server
+type ServerConfiguration struct {
+	Url string
+	Description string
+	Variables map[string]ServerVariable
+}
+
 // Configuration stores the configuration of the API client
 type Configuration struct {
 	BasePath string `json:"basePath,omitempty"`
@@ -57,6 +73,7 @@ type Configuration struct {
 	DefaultHeader map[string]string `json:"defaultHeader,omitempty"`
 	UserAgent string `json:"userAgent,omitempty"`
 	Debug bool `json:"debug,omitempty"`
+	Servers []ServerConfiguration
 	HTTPClient *http.Client
 }
 
@@ -67,6 +84,11 @@ func NewConfiguration() *Configuration {
  DefaultHeader: make(map[string]string),
  UserAgent: "OpenAPI-Generator/1.0.0/go",
  Debug: false,
+ Servers: []ServerConfiguration{{
+ Url: "http://petstore.swagger.io:80/v2",
+ Description: "No description provided",
+ },
+ },
 	}
 	return cfg
 }
@@ -75,3 +97,31 @@ func NewConfiguration() *Configuration {
 func (c *Configuration) AddDefaultHeader(key string, value string) {
 	c.DefaultHeader[key] = value
 }
+
+// ServerUrl returns URL based on server settings
+func (c *Configuration) ServerUrl(index int, variables map[string]string) (string, error) {
+	if index < 0 || len(c.Servers) <= index {
+ return "", fmt.Errorf("Index %v out of range %v", index, len(c.Servers) - 1)
+	}
+	server := c.Servers[index]
+	url := server.Url
+
+	// go through variables and replace placeholders
+	for name, variable := range server.Variables {
+ if value, ok := variables[name]; ok {
+ found := bool(len(variable.EnumValues) == 0)
+ for _, enumValue := range variable.EnumValues {
+ if value == enumValue {
+ found = true
+ }
+ }
+ if !found {
+ return "", fmt.Errorf("The variable %s in the server URL has invalid value %v. Must be %v", name, value, variable.EnumValues)
+ }
+ url = strings.Replace(url, "{"+name+"}", value, -1)
+ } else {
+ url = strings.Replace(url, "{"+name+"}", variable.DefaultValue, -1)
+ }
+	}
+	return url, nil
+}