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|
package endpoints
import (
"encoding/json"
"fmt"
"io"
"github.com/aws/aws-sdk-go/aws/awserr"
)
type modelDefinition map[string]json.RawMessage
// A DecodeModelOptions are the options for how the endpoints model definition
// are decoded.
type DecodeModelOptions struct {
SkipCustomizations bool
}
// Set combines all of the option functions together.
func (d *DecodeModelOptions) Set(optFns ...func(*DecodeModelOptions)) {
for _, fn := range optFns {
fn(d)
}
}
// DecodeModel unmarshals a Regions and Endpoint model definition file into
// a endpoint Resolver. If the file format is not supported, or an error occurs
// when unmarshaling the model an error will be returned.
//
// Casting the return value of this func to a EnumPartitions will
// allow you to get a list of the partitions in the order the endpoints
// will be resolved in.
//
// resolver, err := endpoints.DecodeModel(reader)
//
// partitions := resolver.(endpoints.EnumPartitions).Partitions()
// for _, p := range partitions {
// // ... inspect partitions
// }
func DecodeModel(r io.Reader, optFns ...func(*DecodeModelOptions)) (Resolver, error) {
var opts DecodeModelOptions
opts.Set(optFns...)
// Get the version of the partition file to determine what
// unmarshaling model to use.
modelDef := modelDefinition{}
if err := json.NewDecoder(r).Decode(&modelDef); err != nil {
return nil, newDecodeModelError("failed to decode endpoints model", err)
}
var version string
if b, ok := modelDef["version"]; ok {
version = string(b)
} else {
return nil, newDecodeModelError("endpoints version not found in model", nil)
}
if version == "3" {
return decodeV3Endpoints(modelDef, opts)
}
return nil, newDecodeModelError(
fmt.Sprintf("endpoints version %s, not supported", version), nil)
}
func decodeV3Endpoints(modelDef modelDefinition, opts DecodeModelOptions) (Resolver, error) {
b, ok := modelDef["partitions"]
if !ok {
return nil, newDecodeModelError("endpoints model missing partitions", nil)
}
ps := partitions{}
if err := json.Unmarshal(b, &ps); err != nil {
return nil, newDecodeModelError("failed to decode endpoints model", err)
}
if opts.SkipCustomizations {
return ps, nil
}
// Customization
for i := 0; i < len(ps); i++ {
p := &ps[i]
custRegionalS3(p)
custRmIotDataService(p)
custFixAppAutoscalingChina(p)
custFixAppAutoscalingUsGov(p)
}
return ps, nil
}
func custRegionalS3(p *partition) {
if p.ID != "aws" {
return
}
service, ok := p.Services["s3"]
if !ok {
return
}
const awsGlobal = "aws-global"
const usEast1 = "us-east-1"
// If global endpoint already exists no customization needed.
if _, ok := service.Endpoints[endpointKey{Region: awsGlobal}]; ok {
return
}
service.PartitionEndpoint = awsGlobal
if _, ok := service.Endpoints[endpointKey{Region: usEast1}]; !ok {
service.Endpoints[endpointKey{Region: usEast1}] = endpoint{}
}
service.Endpoints[endpointKey{Region: awsGlobal}] = endpoint{
Hostname: "s3.amazonaws.com",
CredentialScope: credentialScope{
Region: usEast1,
},
}
p.Services["s3"] = service
}
func custRmIotDataService(p *partition) {
delete(p.Services, "data.iot")
}
func custFixAppAutoscalingChina(p *partition) {
if p.ID != "aws-cn" {
return
}
const serviceName = "application-autoscaling"
s, ok := p.Services[serviceName]
if !ok {
return
}
const expectHostname = `autoscaling.{region}.amazonaws.com`
serviceDefault := s.Defaults[defaultKey{}]
if e, a := expectHostname, serviceDefault.Hostname; e != a {
fmt.Printf("custFixAppAutoscalingChina: ignoring customization, expected %s, got %s\n", e, a)
return
}
serviceDefault.Hostname = expectHostname + ".cn"
s.Defaults[defaultKey{}] = serviceDefault
p.Services[serviceName] = s
}
func custFixAppAutoscalingUsGov(p *partition) {
if p.ID != "aws-us-gov" {
return
}
const serviceName = "application-autoscaling"
s, ok := p.Services[serviceName]
if !ok {
return
}
serviceDefault := s.Defaults[defaultKey{}]
if a := serviceDefault.CredentialScope.Service; a != "" {
fmt.Printf("custFixAppAutoscalingUsGov: ignoring customization, expected empty credential scope service, got %s\n", a)
return
}
if a := serviceDefault.Hostname; a != "" {
fmt.Printf("custFixAppAutoscalingUsGov: ignoring customization, expected empty hostname, got %s\n", a)
return
}
serviceDefault.CredentialScope.Service = "application-autoscaling"
serviceDefault.Hostname = "autoscaling.{region}.amazonaws.com"
if s.Defaults == nil {
s.Defaults = make(endpointDefaults)
}
s.Defaults[defaultKey{}] = serviceDefault
p.Services[serviceName] = s
}
type decodeModelError struct {
awsError
}
func newDecodeModelError(msg string, err error) decodeModelError {
return decodeModelError{
awsError: awserr.New("DecodeEndpointsModelError", msg, err),
}
}
|
