ProviderRegistry::createDefaultProviderRequestAuthentication( WordPress\AiClient\Providers\class-string<ProviderInterface> $className ): WordPress\AiClient\Providers\?RequestAuthenticationInterface

418    private function createDefaultProviderRequestAuthentication(string $className): ?RequestAuthenticationInterface419    {420        $providerMetadata = $className::metadata();421        $providerId = $providerMetadata->getId();422        $authenticationMethod = $providerMetadata->getAuthenticationMethod();423        if ($authenticationMethod === null) {424            return null;425        }426        $authenticationClass = $authenticationMethod->getImplementationClass();427        if ($authenticationClass === null) {428            return null;429        }430        $authenticationSchema = $authenticationClass::getJsonSchema();431        // Iterate over all JSON schema object properties to try to determine the necessary authentication data.432        $authenticationData = [];433        if (isset($authenticationSchema['properties']) && is_array($authenticationSchema['properties'])) {434            /** @var array<string, mixed> $details */435            foreach ($authenticationSchema['properties'] as $property => $details) {436                $envVarName = $this->getEnvVarName($providerId, $property);437                // Try to get the value from environment variable or constant.438                $envValue = getenv($envVarName);439                if ($envValue === \false) {440                    if (!defined($envVarName)) {441                        continue;442                        // Skip if neither environment variable nor constant is defined.443                    }444                    $envValue = constant($envVarName);445                    if (!is_scalar($envValue)) {446                        continue;447                    }448                }449                if (isset($details['type'])) {450                    switch ($details['type']) {451                        case 'boolean':452                            $authenticationData[$property] = filter_var($envValue, \FILTER_VALIDATE_BOOLEAN);453                            break;454                        case 'number':455                            $authenticationData[$property] = (int) $envValue;456                            break;457                        case 'string':458                        default:459                            $authenticationData[$property] = (string) $envValue;460                    }461                } else {462                    // Default to string if no type is specified.463                    $authenticationData[$property] = (string) $envValue;464                }465            }466            // If any required fields are missing, return null to avoid immediate errors.467            if (isset($authenticationSchema['required']) && is_array($authenticationSchema['required'])) {468                /** @var list<string> $requiredProperties */469                $requiredProperties = $authenticationSchema['required'];470                if (array_diff_key(array_flip($requiredProperties), $authenticationData)) {471                    return null;472                }473            }474        }475        /** @var RequestAuthenticationInterface */476        /** @var array<string, mixed> $authenticationData */477        return $authenticationClass::fromArray($authenticationData);478    }