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Merge pull request #195 from ccremer/auto-detect-k8s
Auto-detect Kubernetes API URL for web UI
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,29 +1,66 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "os" | ||
|
|
||
| "github.com/ccremer/clustercode/pkg/webui" | ||
| "github.com/lestrrat-go/jwx/v2/jwt" | ||
| "github.com/urfave/cli/v2" | ||
| ) | ||
|
|
||
| const apiUrlFlag = "api-url" | ||
|
|
||
| func newWebuiCommand() *cli.Command { | ||
| command := &webui.Command{} | ||
| return &cli.Command{ | ||
| Name: "webui", | ||
| Usage: "Start clustercode frontend web server", | ||
| Before: LogMetadata, | ||
| Before: discoverKubernetesAPI, | ||
| Action: func(ctx *cli.Context) error { | ||
| command.Log = AppLogger(ctx).WithName(ctx.Command.Name) | ||
| return command.Execute(ctx.Context) | ||
| }, | ||
| Flags: []cli.Flag{ | ||
| &cli.StringFlag{Name: "api-url", EnvVars: envVars("API_URL"), | ||
| Usage: "Full base URL of the Kubernetes API server that is being proxied. If empty, the proxy is disabled.", | ||
| &cli.StringFlag{Name: apiUrlFlag, EnvVars: envVars("API_URL"), | ||
| Usage: "Full base URL of the Kubernetes API server that is being proxied. If empty, the proxy is disabled. If set to 'auto', it will try to discover it using the service account token.", | ||
| Value: "auto", | ||
| Destination: &command.ApiURL, | ||
| }, | ||
| &cli.BoolFlag{Name: "api-tls-skip-verify", EnvVars: envVars("API_TLS_SKIP_VERIFY"), | ||
| Usage: "Whether the certificate verification of the Kubernetes API server should be verified", | ||
| Destination: &command.ApiTLSSkipVerify, | ||
| }, | ||
| &cli.PathFlag{Name: "sa-token-path", EnvVars: envVars("API_SA_TOKEN_PATH"), | ||
| Usage: "Path to the Kubernetes Service Account token secret for auto-discovery", | ||
| Value: "/var/run/secrets/kubernetes.io/serviceaccount/token", | ||
| }, | ||
| }, | ||
| } | ||
| } | ||
|
|
||
| func discoverKubernetesAPI(ctx *cli.Context) error { | ||
| _ = LogMetadata(ctx) | ||
| log := AppLogger(ctx).WithName(ctx.Command.Name) | ||
|
|
||
| if ctx.String(apiUrlFlag) != "auto" { | ||
| return nil | ||
| } | ||
|
|
||
| path := ctx.String("sa-token-path") | ||
| raw, err := os.ReadFile(path) | ||
| if err != nil { | ||
| log.Info("Cannot read the token", "error", err.Error()) | ||
| return ctx.Set(apiUrlFlag, "") | ||
| } | ||
| token, err := jwt.Parse(raw, jwt.WithVerify(false)) | ||
| if err != nil { | ||
| log.Info("Cannot parse the token", "error", err.Error()) | ||
| return ctx.Set(apiUrlFlag, "") | ||
| } | ||
| aud := token.Audience() | ||
| if len(aud) > 0 { | ||
| log.Info("Discovered Kubernetes API URL", "url", aud[0]) | ||
| return ctx.Set(apiUrlFlag, aud[0]) | ||
| } | ||
| return nil | ||
| } |