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v3model.go
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/
v3model.go
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package endpoints
import (
"encoding/json"
"fmt"
"regexp"
"strconv"
"strings"
)
const (
ec2MetadataEndpointIPv6 = "http://[fd00:ec2::254]/latest"
ec2MetadataEndpointIPv4 = "http://169.254.169.254/latest"
)
const dnsSuffixTemplateKey = "{dnsSuffix}"
// defaultKey is a compound map key of a variant and other values.
type defaultKey struct {
Variant endpointVariant
ServiceVariant serviceVariant
}
// endpointKey is a compound map key of a region and associated variant value.
type endpointKey struct {
Region string
Variant endpointVariant
}
// endpointVariant is a bit field to describe the endpoints attributes.
type endpointVariant uint64
// serviceVariant is a bit field to describe the service endpoint attributes.
type serviceVariant uint64
const (
// fipsVariant indicates that the endpoint is FIPS capable.
fipsVariant endpointVariant = 1 << (64 - 1 - iota)
// dualStackVariant indicates that the endpoint is DualStack capable.
dualStackVariant
)
var regionValidationRegex = regexp.MustCompile(`^[[:alnum:]]([[:alnum:]\-]*[[:alnum:]])?$`)
type partitions []partition
func (ps partitions) EndpointFor(service, region string, opts ...func(*Options)) (ResolvedEndpoint, error) {
var opt Options
opt.Set(opts...)
if len(opt.ResolvedRegion) > 0 {
region = opt.ResolvedRegion
}
for i := 0; i < len(ps); i++ {
if !ps[i].canResolveEndpoint(service, region, opt) {
continue
}
return ps[i].EndpointFor(service, region, opts...)
}
// If loose matching fallback to first partition format to use
// when resolving the endpoint.
if !opt.StrictMatching && len(ps) > 0 {
return ps[0].EndpointFor(service, region, opts...)
}
return ResolvedEndpoint{}, NewUnknownEndpointError("all partitions", service, region, []string{})
}
// Partitions satisfies the EnumPartitions interface and returns a list
// of Partitions representing each partition represented in the SDK's
// endpoints model.
func (ps partitions) Partitions() []Partition {
parts := make([]Partition, 0, len(ps))
for i := 0; i < len(ps); i++ {
parts = append(parts, ps[i].Partition())
}
return parts
}
type endpointWithVariants struct {
endpoint
Variants []endpointWithTags `json:"variants"`
}
type endpointWithTags struct {
endpoint
Tags []string `json:"tags"`
}
type endpointDefaults map[defaultKey]endpoint
func (p *endpointDefaults) UnmarshalJSON(data []byte) error {
if *p == nil {
*p = make(endpointDefaults)
}
var e endpointWithVariants
if err := json.Unmarshal(data, &e); err != nil {
return err
}
(*p)[defaultKey{Variant: 0}] = e.endpoint
e.Hostname = ""
e.DNSSuffix = ""
for _, variant := range e.Variants {
endpointVariant, unknown := parseVariantTags(variant.Tags)
if unknown {
continue
}
var ve endpoint
ve.mergeIn(e.endpoint)
ve.mergeIn(variant.endpoint)
(*p)[defaultKey{Variant: endpointVariant}] = ve
}
return nil
}
func parseVariantTags(tags []string) (ev endpointVariant, unknown bool) {
if len(tags) == 0 {
unknown = true
return
}
for _, tag := range tags {
switch {
case strings.EqualFold("fips", tag):
ev |= fipsVariant
case strings.EqualFold("dualstack", tag):
ev |= dualStackVariant
default:
unknown = true
}
}
return ev, unknown
}
type partition struct {
ID string `json:"partition"`
Name string `json:"partitionName"`
DNSSuffix string `json:"dnsSuffix"`
RegionRegex regionRegex `json:"regionRegex"`
Defaults endpointDefaults `json:"defaults"`
Regions regions `json:"regions"`
Services services `json:"services"`
}
func (p partition) Partition() Partition {
return Partition{
dnsSuffix: p.DNSSuffix,
id: p.ID,
p: &p,
}
}
func (p partition) canResolveEndpoint(service, region string, options Options) bool {
s, hasService := p.Services[service]
_, hasEndpoint := s.Endpoints[endpointKey{
Region: region,
Variant: options.getEndpointVariant(service),
}]
if hasEndpoint && hasService {
return true
}
if options.StrictMatching {
return false
}
return p.RegionRegex.MatchString(region)
}
func allowLegacyEmptyRegion(service string) bool {
legacy := map[string]struct{}{
"budgets": {},
"ce": {},
"chime": {},
"cloudfront": {},
"ec2metadata": {},
"iam": {},
"importexport": {},
"organizations": {},
"route53": {},
"sts": {},
"support": {},
"waf": {},
}
_, allowed := legacy[service]
return allowed
}
func (p partition) EndpointFor(service, region string, opts ...func(*Options)) (resolved ResolvedEndpoint, err error) {
var opt Options
opt.Set(opts...)
if len(opt.ResolvedRegion) > 0 {
region = opt.ResolvedRegion
}
s, hasService := p.Services[service]
if service == Ec2metadataServiceID && !hasService {
endpoint := getEC2MetadataEndpoint(p.ID, service, opt.EC2MetadataEndpointMode)
return endpoint, nil
}
if len(service) == 0 || !(hasService || opt.ResolveUnknownService) {
// Only return error if the resolver will not fallback to creating
// endpoint based on service endpoint ID passed in.
return resolved, NewUnknownServiceError(p.ID, service, serviceList(p.Services))
}
if len(region) == 0 && allowLegacyEmptyRegion(service) && len(s.PartitionEndpoint) != 0 {
region = s.PartitionEndpoint
}
if r, ok := isLegacyGlobalRegion(service, region, opt); ok {
region = r
}
variant := opt.getEndpointVariant(service)
endpoints := s.Endpoints
serviceDefaults, hasServiceDefault := s.Defaults[defaultKey{Variant: variant}]
// If we searched for a variant which may have no explicit service defaults,
// then we need to inherit the standard service defaults except the hostname and dnsSuffix
if variant != 0 && !hasServiceDefault {
serviceDefaults = s.Defaults[defaultKey{}]
serviceDefaults.Hostname = ""
serviceDefaults.DNSSuffix = ""
}
partitionDefaults, hasPartitionDefault := p.Defaults[defaultKey{Variant: variant}]
var dnsSuffix string
if len(serviceDefaults.DNSSuffix) > 0 {
dnsSuffix = serviceDefaults.DNSSuffix
} else if variant == 0 {
// For legacy reasons the partition dnsSuffix is not in the defaults, so if we looked for
// a non-variant endpoint then we need to set the dnsSuffix.
dnsSuffix = p.DNSSuffix
}
noDefaults := !hasServiceDefault && !hasPartitionDefault
e, hasEndpoint := s.endpointForRegion(region, endpoints, variant)
if len(region) == 0 || (!hasEndpoint && (opt.StrictMatching || noDefaults)) {
return resolved, NewUnknownEndpointError(p.ID, service, region, endpointList(endpoints, variant))
}
defs := []endpoint{partitionDefaults, serviceDefaults}
return e.resolve(service, p.ID, region, dnsSuffixTemplateKey, dnsSuffix, defs, opt)
}
func getEC2MetadataEndpoint(partitionID, service string, mode EC2IMDSEndpointModeState) ResolvedEndpoint {
switch mode {
case EC2IMDSEndpointModeStateIPv6:
return ResolvedEndpoint{
URL: ec2MetadataEndpointIPv6,
PartitionID: partitionID,
SigningRegion: "aws-global",
SigningName: service,
SigningNameDerived: true,
SigningMethod: "v4",
}
case EC2IMDSEndpointModeStateIPv4:
fallthrough
default:
return ResolvedEndpoint{
URL: ec2MetadataEndpointIPv4,
PartitionID: partitionID,
SigningRegion: "aws-global",
SigningName: service,
SigningNameDerived: true,
SigningMethod: "v4",
}
}
}
func isLegacyGlobalRegion(service string, region string, opt Options) (string, bool) {
if opt.getEndpointVariant(service) != 0 {
return "", false
}
const (
sts = "sts"
s3 = "s3"
awsGlobal = "aws-global"
)
switch {
case service == sts && opt.STSRegionalEndpoint == RegionalSTSEndpoint:
return region, false
case service == s3 && opt.S3UsEast1RegionalEndpoint == RegionalS3UsEast1Endpoint:
return region, false
default:
if _, ok := legacyGlobalRegions[service][region]; ok {
return awsGlobal, true
}
}
return region, false
}
func serviceList(ss services) []string {
list := make([]string, 0, len(ss))
for k := range ss {
list = append(list, k)
}
return list
}
func endpointList(es serviceEndpoints, variant endpointVariant) []string {
list := make([]string, 0, len(es))
for k := range es {
if k.Variant != variant {
continue
}
list = append(list, k.Region)
}
return list
}
type regionRegex struct {
*regexp.Regexp
}
func (rr *regionRegex) UnmarshalJSON(b []byte) (err error) {
// Strip leading and trailing quotes
regex, err := strconv.Unquote(string(b))
if err != nil {
return fmt.Errorf("unable to strip quotes from regex, %v", err)
}
rr.Regexp, err = regexp.Compile(regex)
if err != nil {
return fmt.Errorf("unable to unmarshal region regex, %v", err)
}
return nil
}
type regions map[string]region
type region struct {
Description string `json:"description"`
}
type services map[string]service
type service struct {
PartitionEndpoint string `json:"partitionEndpoint"`
IsRegionalized boxedBool `json:"isRegionalized,omitempty"`
Defaults endpointDefaults `json:"defaults"`
Endpoints serviceEndpoints `json:"endpoints"`
}
func (s *service) endpointForRegion(region string, endpoints serviceEndpoints, variant endpointVariant) (endpoint, bool) {
if e, ok := endpoints[endpointKey{Region: region, Variant: variant}]; ok {
return e, true
}
if s.IsRegionalized == boxedFalse {
return endpoints[endpointKey{Region: s.PartitionEndpoint, Variant: variant}], region == s.PartitionEndpoint
}
// Unable to find any matching endpoint, return
// blank that will be used for generic endpoint creation.
return endpoint{}, false
}
type serviceEndpoints map[endpointKey]endpoint
func (s *serviceEndpoints) UnmarshalJSON(data []byte) error {
if *s == nil {
*s = make(serviceEndpoints)
}
var regionToEndpoint map[string]endpointWithVariants
if err := json.Unmarshal(data, ®ionToEndpoint); err != nil {
return err
}
for region, e := range regionToEndpoint {
(*s)[endpointKey{Region: region}] = e.endpoint
e.Hostname = ""
e.DNSSuffix = ""
for _, variant := range e.Variants {
endpointVariant, unknown := parseVariantTags(variant.Tags)
if unknown {
continue
}
var ve endpoint
ve.mergeIn(e.endpoint)
ve.mergeIn(variant.endpoint)
(*s)[endpointKey{Region: region, Variant: endpointVariant}] = ve
}
}
return nil
}
type endpoint struct {
Hostname string `json:"hostname"`
Protocols []string `json:"protocols"`
CredentialScope credentialScope `json:"credentialScope"`
DNSSuffix string `json:"dnsSuffix"`
// Signature Version not used
SignatureVersions []string `json:"signatureVersions"`
// SSLCommonName not used.
SSLCommonName string `json:"sslCommonName"`
Deprecated boxedBool `json:"deprecated"`
}
// isZero returns whether the endpoint structure is an empty (zero) value.
func (e endpoint) isZero() bool {
switch {
case len(e.Hostname) != 0:
return false
case len(e.Protocols) != 0:
return false
case e.CredentialScope != (credentialScope{}):
return false
case len(e.SignatureVersions) != 0:
return false
case len(e.SSLCommonName) != 0:
return false
}
return true
}
const (
defaultProtocol = "https"
defaultSigner = "v4"
)
var (
protocolPriority = []string{"https", "http"}
signerPriority = []string{"v4", "v2"}
)
func getByPriority(s []string, p []string, def string) string {
if len(s) == 0 {
return def
}
for i := 0; i < len(p); i++ {
for j := 0; j < len(s); j++ {
if s[j] == p[i] {
return s[j]
}
}
}
return s[0]
}
func (e endpoint) resolve(service, partitionID, region, dnsSuffixTemplateVariable, dnsSuffix string, defs []endpoint, opts Options) (ResolvedEndpoint, error) {
var merged endpoint
for _, def := range defs {
merged.mergeIn(def)
}
merged.mergeIn(e)
e = merged
signingRegion := e.CredentialScope.Region
if len(signingRegion) == 0 {
signingRegion = region
}
signingName := e.CredentialScope.Service
var signingNameDerived bool
if len(signingName) == 0 {
signingName = service
signingNameDerived = true
}
hostname := e.Hostname
if !validateInputRegion(region) {
return ResolvedEndpoint{}, fmt.Errorf("invalid region identifier format provided")
}
if len(merged.DNSSuffix) > 0 {
dnsSuffix = merged.DNSSuffix
}
u := strings.Replace(hostname, "{service}", service, 1)
u = strings.Replace(u, "{region}", region, 1)
u = strings.Replace(u, dnsSuffixTemplateVariable, dnsSuffix, 1)
scheme := getEndpointScheme(e.Protocols, opts.DisableSSL)
u = fmt.Sprintf("%s://%s", scheme, u)
if e.Deprecated == boxedTrue && opts.LogDeprecated && opts.Logger != nil {
opts.Logger.Log(fmt.Sprintf("endpoint identifier %q, url %q marked as deprecated", region, u))
}
return ResolvedEndpoint{
URL: u,
PartitionID: partitionID,
SigningRegion: signingRegion,
SigningName: signingName,
SigningNameDerived: signingNameDerived,
SigningMethod: getByPriority(e.SignatureVersions, signerPriority, defaultSigner),
}, nil
}
func getEndpointScheme(protocols []string, disableSSL bool) string {
if disableSSL {
return "http"
}
return getByPriority(protocols, protocolPriority, defaultProtocol)
}
func (e *endpoint) mergeIn(other endpoint) {
if len(other.Hostname) > 0 {
e.Hostname = other.Hostname
}
if len(other.Protocols) > 0 {
e.Protocols = other.Protocols
}
if len(other.SignatureVersions) > 0 {
e.SignatureVersions = other.SignatureVersions
}
if len(other.CredentialScope.Region) > 0 {
e.CredentialScope.Region = other.CredentialScope.Region
}
if len(other.CredentialScope.Service) > 0 {
e.CredentialScope.Service = other.CredentialScope.Service
}
if len(other.SSLCommonName) > 0 {
e.SSLCommonName = other.SSLCommonName
}
if len(other.DNSSuffix) > 0 {
e.DNSSuffix = other.DNSSuffix
}
if other.Deprecated != boxedBoolUnset {
e.Deprecated = other.Deprecated
}
}
type credentialScope struct {
Region string `json:"region"`
Service string `json:"service"`
}
type boxedBool int
func (b *boxedBool) UnmarshalJSON(buf []byte) error {
v, err := strconv.ParseBool(string(buf))
if err != nil {
return err
}
if v {
*b = boxedTrue
} else {
*b = boxedFalse
}
return nil
}
const (
boxedBoolUnset boxedBool = iota
boxedFalse
boxedTrue
)
func validateInputRegion(region string) bool {
return regionValidationRegex.MatchString(region)
}