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70 lines
2.2 KiB
70 lines
2.2 KiB
// Package endpoints validates regional endpoints for services.
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package endpoints
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//go:generate go run ../model/cli/gen-endpoints/main.go endpoints.json endpoints_map.go
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//go:generate gofmt -s -w endpoints_map.go
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import (
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"fmt"
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"regexp"
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"strings"
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)
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// NormalizeEndpoint takes and endpoint and service API information to return a
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// normalized endpoint and signing region. If the endpoint is not an empty string
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// the service name and region will be used to look up the service's API endpoint.
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// If the endpoint is provided the scheme will be added if it is not present.
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func NormalizeEndpoint(endpoint, serviceName, region string, disableSSL, useDualStack bool) (normEndpoint, signingRegion string) {
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if endpoint == "" {
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return EndpointForRegion(serviceName, region, disableSSL, useDualStack)
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}
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return AddScheme(endpoint, disableSSL), ""
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}
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// EndpointForRegion returns an endpoint and its signing region for a service and region.
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// if the service and region pair are not found endpoint and signingRegion will be empty.
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func EndpointForRegion(svcName, region string, disableSSL, useDualStack bool) (endpoint, signingRegion string) {
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dualStackField := ""
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if useDualStack {
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dualStackField = "/dualstack"
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}
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derivedKeys := []string{
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region + "/" + svcName + dualStackField,
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region + "/*" + dualStackField,
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"*/" + svcName + dualStackField,
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"*/*" + dualStackField,
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}
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for _, key := range derivedKeys {
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if val, ok := endpointsMap.Endpoints[key]; ok {
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ep := val.Endpoint
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ep = strings.Replace(ep, "{region}", region, -1)
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ep = strings.Replace(ep, "{service}", svcName, -1)
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endpoint = ep
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signingRegion = val.SigningRegion
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break
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}
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}
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return AddScheme(endpoint, disableSSL), signingRegion
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}
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// Regular expression to determine if the endpoint string is prefixed with a scheme.
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var schemeRE = regexp.MustCompile("^([^:]+)://")
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// AddScheme adds the HTTP or HTTPS schemes to a endpoint URL if there is no
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// scheme. If disableSSL is true HTTP will be added instead of the default HTTPS.
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func AddScheme(endpoint string, disableSSL bool) string {
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if endpoint != "" && !schemeRE.MatchString(endpoint) {
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scheme := "https"
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if disableSSL {
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scheme = "http"
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}
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endpoint = fmt.Sprintf("%s://%s", scheme, endpoint)
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}
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return endpoint
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}
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