Function UserIDIsWithinApplicationServiceNamespace

clientapi/routing/register.go:403–447

UserIDIsWithinApplicationServiceNamespace checks to see if a given userID falls within any of the namespaces of a given Application Service. If no Application Service is given, it will check to see if it matches any Application Service's namespace.

(
	cfg *config.ClientAPI,
	userID string,
	appservice *config.ApplicationService,
)

// Application Service is given, it will check to see if it matches any
// Application Service's namespace.
func UserIDIsWithinApplicationServiceNamespace(
	cfg *config.ClientAPI,
	userID string,
	appservice *config.ApplicationService,
) bool {

	var local, domain, err = gomatrixserverlib.SplitID('@', userID)
	if err != nil {
		// Not a valid userID
		return false
	}

	if domain != cfg.Matrix.ServerName {
		return false
	}

	if appservice != nil {
		if appservice.SenderLocalpart == local {
			return true
		}

		// Loop through given application service's namespaces and see if any match
		for _, namespace := range appservice.NamespaceMap["users"] {
			// AS namespaces are checked for validity in config
			if namespace.RegexpObject.MatchString(userID) {
				return true
			}
		}
		return false
	}

	// Loop through all known application service's namespaces and see if any match
	for _, knownAppService := range cfg.Derived.ApplicationServices {
		if knownAppService.SenderLocalpart == local {
			return true
		}
		for _, namespace := range knownAppService.NamespaceMap["users"] {
			// AS namespaces are checked for validity in config
			if namespace.RegexpObject.MatchString(userID) {
				return true
			}
		}
	}
	return false
}

// UsernameMatchesMultipleExclusiveNamespaces will check if a given username matches
// more than one exclusive namespace. More than one is not allowed