feat(admin): module skeleton, config and two database connections

Adds the admin module: env config with fail-fast validation, two MongoDB connections (its own vantage_admin database plus a narrow path into the control plane), the boot sequence and the image. Config refuses to start without a signing key, and both Mongo URIs must name their database inline -- admin talks to two databases, so a bare MONGO_DB would be ambiguous about which. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
2026-07-25 18:58:44 +01:00
parent c4f1684304
commit 64eac6dbc7
8 changed files with 332 additions and 0 deletions
@@ -0,0 +1,110 @@
+// Package config parses and validates admin's environment.
+//
+// Everything required is checked at boot and the process refuses to start
+// without it. A licensing service that cannot sign is worse than one that is
+// down, because it looks healthy.
+package config
+
+import (
+	"fmt"
+	"net/url"
+	"os"
+	"strings"
+)
+
+type Config struct {
+	AdminMongoURI   string
+	AdminDBName     string
+	ControlMongoURI string
+	ControlDBName   string
+	RedisAddr       string
+	SigningKey      string
+	PublicURL       string
+	AllowedOrigins  []string
+	TrustProxy      bool
+	Addr            string
+
+	SMTPHost     string
+	SMTPPort     string
+	SMTPFrom     string
+	SMTPUsername string
+	SMTPPassword string
+}
+
+// dbNameFromURI reads the database from a Mongo URI path.
+//
+// Both URIs must name their database inline rather than through a separate
+// variable. Admin talks to two databases; a bare MONGO_DB would be ambiguous
+// about which, and guessing wrong means writing licence fields into the wrong
+// place.
+func dbNameFromURI(raw, which string) (string, error) {
+	u, err := url.Parse(raw)
+	if err != nil {
+		return "", fmt.Errorf("%s is not a valid URI: %w", which, err)
+	}
+	name := strings.TrimPrefix(u.Path, "/")
+	if name == "" {
+		return "", fmt.Errorf("%s must name a database in its path, e.g. mongodb://host:27017/vantage_admin", which)
+	}
+	return name, nil
+}
+
+func Load() (Config, error) {
+	c := Config{
+		AdminMongoURI:   os.Getenv("ADMIN_MONGO_URI"),
+		ControlMongoURI: os.Getenv("CONTROL_MONGO_URI"),
+		RedisAddr:       os.Getenv("REDIS_ADDR"),
+		SigningKey:      os.Getenv("LICENSE_SIGNING_KEY"),
+		PublicURL:       strings.TrimSuffix(os.Getenv("PUBLIC_URL"), "/"),
+		TrustProxy:      strings.EqualFold(os.Getenv("TRUST_PROXY"), "true"),
+		Addr:            ":" + envOr("PORT", "8083"),
+
+		SMTPHost:     os.Getenv("SMTP_HOST"),
+		SMTPPort:     envOr("SMTP_PORT", "587"),
+		SMTPFrom:     os.Getenv("SMTP_FROM"),
+		SMTPUsername: os.Getenv("SMTP_USERNAME"),
+		SMTPPassword: os.Getenv("SMTP_PASSWORD"),
+	}
+
+	var missing []string
+	for name, v := range map[string]string{
+		"ADMIN_MONGO_URI":     c.AdminMongoURI,
+		"CONTROL_MONGO_URI":   c.ControlMongoURI,
+		"REDIS_ADDR":          c.RedisAddr,
+		"LICENSE_SIGNING_KEY": c.SigningKey,
+		"PUBLIC_URL":          c.PublicURL,
+		"ADMIN_ORIGIN":        os.Getenv("ADMIN_ORIGIN"),
+	} {
+		if v == "" {
+			missing = append(missing, name)
+		}
+	}
+	if len(missing) > 0 {
+		return Config{}, fmt.Errorf("missing required environment: %s", strings.Join(missing, ", "))
+	}
+
+	var err error
+	if c.AdminDBName, err = dbNameFromURI(c.AdminMongoURI, "ADMIN_MONGO_URI"); err != nil {
+		return Config{}, err
+	}
+	if c.ControlDBName, err = dbNameFromURI(c.ControlMongoURI, "CONTROL_MONGO_URI"); err != nil {
+		return Config{}, err
+	}
+	if c.AdminMongoURI == c.ControlMongoURI {
+		return Config{}, fmt.Errorf("ADMIN_MONGO_URI and CONTROL_MONGO_URI must not be the same database")
+	}
+
+	for _, o := range strings.Split(os.Getenv("ADMIN_ORIGIN"), ",") {
+		if o = strings.TrimSpace(o); o != "" {
+			c.AllowedOrigins = append(c.AllowedOrigins, o)
+		}
+	}
+	return c, nil
+}
+
+func envOr(key, fallback string) string {
+	if v := os.Getenv(key); v != "" {
+		return v
+	}
+	return fallback
+}