/
main.go
170 lines (133 loc) · 4.44 KB
/
main.go
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package main
import (
"errors"
"flag"
"fmt"
"io"
"log"
"os"
"github.com/3scale/3scale-istio-adapter/pkg/kubernetes"
)
var (
accessToken string
svcID string
threescaleURL string
backendURL string
name string
outputTo string
authType int
namespace string
version string
)
const (
nameDescription = "Unique name for this (url,token) pair (required)"
tokenDescription = "3scale access token (required)"
threescaleDescription = "The 3scale admin portal URL (required)"
backendDescription = "The 3scale backend url"
svcIDDescription = "The ID of the 3scale service. If set the generated configuration will apply to this service only."
outputDescription = "File to output templates. Prints to stdout if none provided"
authTypeDescription = "3scale authentication pattern to use. 1=ApiKey, 2=AppID, 3=OpenID Connect. Default template supports a hybrid if none provided"
namespaceDescription = "The namespace which the manifests should be generated for. Default 'istio-system'"
outputDefault, tokenDefault, svcDefault, urlDefault = "", "", "", ""
istioNamespaceDefault = kubernetes.DefaultNamespace
)
func init() {
flag.StringVar(&accessToken, "token", tokenDefault, tokenDescription)
flag.StringVar(&accessToken, "t", tokenDefault, tokenDescription+" (short)")
flag.StringVar(&svcID, "service", svcDefault, svcIDDescription)
flag.StringVar(&name, "name", "", nameDescription)
flag.StringVar(&threescaleURL, "url", urlDefault, threescaleDescription)
flag.StringVar(&threescaleURL, "u", urlDefault, threescaleDescription+" (short)")
flag.StringVar(&backendURL, "backend-url", urlDefault, backendDescription)
flag.StringVar(&outputTo, "output", outputDefault, outputDescription)
flag.StringVar(&outputTo, "o", outputDefault, outputDescription+" (short)")
flag.IntVar(&authType, "auth", 0, authTypeDescription)
flag.StringVar(&namespace, "namespace", istioNamespaceDefault, namespaceDescription)
flag.StringVar(&namespace, "n", istioNamespaceDefault, namespaceDescription+" (short)")
v := flag.Bool("version", false, "Prints CLI version")
flag.Parse()
if *v {
if version == "" {
version = "undefined"
}
fmt.Printf("3scale-config-gen version %s\n", version)
os.Exit(0)
}
checkEnv()
}
func checkEnv() {
if accessToken == "" {
accessToken = os.Getenv("THREESCALE_ACCESS_TOKEN")
}
if threescaleURL == "" {
threescaleURL = os.Getenv("THREESCALE_ADMIN_PORTAL")
}
}
func validate() []error {
var errs []error
if name == "" {
errs = append(errs, errors.New("error missing parameter. --name is required"))
}
if accessToken == "" {
errs = append(errs, errors.New("error missing parameter. --token is required"))
}
if threescaleURL == "" {
errs = append(errs, errors.New("error missing parameter. --url is required"))
}
return errs
}
func execute() error {
var writeTo io.Writer
handler, err := kubernetes.NewThreescaleHandlerSpec(accessToken, threescaleURL, svcID)
if err != nil {
return fmt.Errorf("error creating required handler " + err.Error())
}
// set the optional backend url override
handler.Params.BackendUrl = backendURL
var instance *kubernetes.BaseInstance
switch authType {
case 0:
instance = kubernetes.NewDefaultHybridInstance()
case 1:
instance = kubernetes.NewApiKeyInstance(kubernetes.DefaultApiKeyAttribute)
case 2:
instance = kubernetes.NewAppIDAppKeyInstance(kubernetes.DefaultAppIDAttribute, kubernetes.DefaultAppKeyAttribute)
case 3:
instance = kubernetes.NewOIDCInstance(kubernetes.DefaultOIDCAttribute, kubernetes.DefaultAppKeyAttribute)
default:
return fmt.Errorf("unsupported authentication type provided")
}
handlerName := fmt.Sprintf("%s.handler.%s", name, namespace)
instanceName := fmt.Sprintf("%s.instance.%s", name, namespace)
rule := kubernetes.NewRule(kubernetes.GetDefaultMatchConditions(name), handlerName, instanceName)
cg, err := kubernetes.NewConfigGenerator(name, *handler, *instance, rule)
if err != nil {
return fmt.Errorf("error creating config generator " + err.Error())
}
cg.SetNamespace(namespace)
if outputTo == "" {
writeTo = os.Stdout
} else {
f, err := os.Create(outputTo)
if err != nil {
panic(err)
}
writeTo = f
}
return cg.OutputAll(writeTo)
}
func main() {
errs := validate()
if errs != nil {
log.Println("Error validating input:")
for _, i := range errs {
fmt.Println(i.Error())
}
os.Exit(1)
}
err := execute()
if err != nil {
fmt.Println(err.Error())
os.Exit(1)
}
}