zero: only leave public packages in pkg/zero (#4854)

internal/zero/api/config.go

@@ -0,0 +1,87 @@
+package zero
+
+import (
+	"fmt"
+	"net/http"
+	"time"
+)
+
+// Option is a functional option for the SDK
+type Option func(*config)
+
+type config struct {
+	clusterAPIEndpoint  string
+	connectAPIEndpoint  string
+	apiToken            string
+	httpClient          *http.Client
+	downloadURLCacheTTL time.Duration
+}
+
+// WithClusterAPIEndpoint sets the cluster API endpoint
+func WithClusterAPIEndpoint(endpoint string) Option {
+	return func(cfg *config) {
+		cfg.clusterAPIEndpoint = endpoint
+	}
+}
+
+// WithConnectAPIEndpoint sets the connect API endpoint
+func WithConnectAPIEndpoint(endpoint string) Option {
+	return func(cfg *config) {
+		cfg.connectAPIEndpoint = endpoint
+	}
+}
+
+// WithAPIToken sets the API token
+func WithAPIToken(token string) Option {
+	return func(cfg *config) {
+		cfg.apiToken = token
+	}
+}
+
+// WithHTTPClient sets the HTTP client
+func WithHTTPClient(client *http.Client) Option {
+	return func(cfg *config) {
+		cfg.httpClient = client
+	}
+}
+
+// WithDownloadURLCacheTTL sets the minimum TTL for download URL cache entries
+func WithDownloadURLCacheTTL(ttl time.Duration) Option {
+	return func(cfg *config) {
+		cfg.downloadURLCacheTTL = ttl
+	}
+}
+
+func newConfig(opts ...Option) (*config, error) {
+	cfg := new(config)
+	for _, opt := range []Option{
+		WithHTTPClient(http.DefaultClient),
+		WithDownloadURLCacheTTL(15 * time.Minute),
+	} {
+		opt(cfg)
+	}
+
+	for _, opt := range opts {
+		opt(cfg)
+	}
+	if err := cfg.validate(); err != nil {
+		return nil, err
+	}
+	return cfg, nil
+}
+
+func (c *config) validate() error {
+	if c.clusterAPIEndpoint == "" {
+		return fmt.Errorf("cluster API endpoint is required")
+	}
+	if c.connectAPIEndpoint == "" {
+		return fmt.Errorf("connect API endpoint is required")
+	}
+	if c.apiToken == "" {
+		return fmt.Errorf("API token is required")
+	}
+	if c.httpClient == nil {
+		return fmt.Errorf("HTTP client is required")
+	}
+	return nil
+}