Initial QSfera import

Server/services/graph/pkg/config/parser/parse.go

@@ -0,0 +1,126 @@
+package parser
+
+import (
+	"errors"
+	"fmt"
+	"slices"
+
+	"github.com/go-ldap/ldap/v3"
+
+	occfg "github.com/qsfera/server/pkg/config"
+	defaults2 "github.com/qsfera/server/pkg/config/defaults"
+	"github.com/qsfera/server/pkg/config/envdecode"
+	"github.com/qsfera/server/pkg/shared"
+	"github.com/qsfera/server/services/graph/pkg/config"
+	"github.com/qsfera/server/services/graph/pkg/config/defaults"
+	"github.com/qsfera/server/services/graph/pkg/unifiedrole"
+)
+
+// ParseConfig loads configuration from known paths.
+func ParseConfig(cfg *config.Config) error {
+	err := occfg.BindSourcesToStructs(cfg.Service.Name, cfg)
+	if err != nil {
+		return err
+	}
+
+	defaults.EnsureDefaults(cfg)
+
+	// load all env variables relevant to the config in the current context.
+	if err := envdecode.Decode(cfg); err != nil {
+		// no environment variable set for this config is an expected "error"
+		if !errors.Is(err, envdecode.ErrNoTargetFieldsAreSet) {
+			return err
+		}
+	}
+
+	defaults.Sanitize(cfg)
+
+	return Validate(cfg)
+}
+
+func Validate(cfg *config.Config) error {
+	if cfg.TokenManager.JWTSecret == "" {
+		return shared.MissingJWTTokenError(cfg.Service.Name)
+	}
+
+	if !slices.Contains([]string{"ldap", "cs3"}, cfg.Identity.Backend) {
+		return fmt.Errorf("'%s' is not a valid identity backend	for the 'graph' service", cfg.Identity.Backend)
+	}
+
+	// ensure that the "cs3" identity backend is used in multi-tenant setups
+	if cfg.Commons.MultiTenantEnabled && cfg.Identity.Backend != "cs3" {
+		return fmt.Errorf("Multi-tenant support is enabled. The identity backend must be set to 'cs3' for the 'graph' service.")
+	}
+	if cfg.Identity.Backend == "ldap" {
+		if err := validateLDAPSettings(cfg); err != nil {
+			return err
+		}
+	}
+
+	if cfg.Application.ID == "" {
+		return fmt.Errorf("The application ID has not been configured for %s. "+
+			"Make sure your %s config contains the proper values "+
+			"(e.g. by running qsfera init or setting it manually in "+
+			"the config/corresponding environment variable).",
+			"graph", defaults2.BaseConfigPath())
+	}
+
+	switch cfg.API.UsernameMatch {
+	case "default", "none":
+	default:
+		return fmt.Errorf("The username match validator is invalid for %s. "+
+			"Make sure your %s config contains the proper values "+
+			"(e.g. by running qsfera init or setting it manually in "+
+			"the config/corresponding environment variable).",
+			"graph", defaults2.BaseConfigPath())
+	}
+
+	if cfg.ServiceAccount.ServiceAccountID == "" {
+		return shared.MissingServiceAccountID(cfg.Service.Name)
+	}
+	if cfg.ServiceAccount.ServiceAccountSecret == "" {
+		return shared.MissingServiceAccountSecret(cfg.Service.Name)
+	}
+
+	// validate unified roles
+	{
+		var err error
+
+		for _, uid := range cfg.UnifiedRoles.AvailableRoles {
+			// check if the role is known
+			if len(unifiedrole.GetRoles(unifiedrole.RoleFilterIDs(uid))) == 0 {
+				// collect all possible errors to return them all at once
+				err = errors.Join(err, fmt.Errorf("%w: %s", unifiedrole.ErrUnknownRole, uid))
+			}
+		}
+
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func validateLDAPSettings(cfg *config.Config) error {
+	if cfg.Identity.LDAP.BindPassword == "" {
+		return shared.MissingLDAPBindPassword(cfg.Service.Name)
+	}
+
+	// ensure that "GroupBaseDN" is below "GroupBaseDN"
+	if cfg.Identity.LDAP.WriteEnabled && cfg.Identity.LDAP.GroupCreateBaseDN != cfg.Identity.LDAP.GroupBaseDN {
+		baseDN, err := ldap.ParseDN(cfg.Identity.LDAP.GroupBaseDN)
+		if err != nil {
+			return fmt.Errorf("Unable to parse the LDAP Group Base DN '%s': %w ", cfg.Identity.LDAP.GroupBaseDN, err)
+		}
+		createBaseDN, err := ldap.ParseDN(cfg.Identity.LDAP.GroupCreateBaseDN)
+		if err != nil {
+			return fmt.Errorf("Unable to parse the LDAP Group Create Base DN '%s': %w ", cfg.Identity.LDAP.GroupCreateBaseDN, err)
+		}
+
+		if !baseDN.AncestorOfFold(createBaseDN) {
+			return fmt.Errorf("The LDAP Group Create Base DN (%s) must be subordinate to the LDAP Group Base DN (%s)", cfg.Identity.LDAP.GroupCreateBaseDN, cfg.Identity.LDAP.GroupBaseDN)
+		}
+	}
+	return nil
+}