'use strict';

var protocols = require('@smithy/core/protocols');
var core = require('@smithy/core');
var config = require('@smithy/core/config');
var client = require('@aws-sdk/core/client');
var signatureV4 = require('@smithy/signature-v4');

const getDateHeader = (response) => protocols.HttpResponse.isInstance(response) ? response.headers?.date ?? response.headers?.Date : undefined;

const getSkewCorrectedDate = (systemClockOffset) => new Date(Date.now() + systemClockOffset);

const isClockSkewed = (clockTime, systemClockOffset) => Math.abs(getSkewCorrectedDate(systemClockOffset).getTime() - clockTime) >= 300000;

const getUpdatedSystemClockOffset = (clockTime, currentSystemClockOffset) => {
    const clockTimeInMs = Date.parse(clockTime);
    if (isClockSkewed(clockTimeInMs, currentSystemClockOffset)) {
        return clockTimeInMs - Date.now();
    }
    return currentSystemClockOffset;
};

const throwSigningPropertyError = (name, property) => {
    if (!property) {
        throw new Error(`Property \`${name}\` is not resolved for AWS SDK SigV4Auth`);
    }
    return property;
};
const validateSigningProperties = async (signingProperties) => {
    const context = throwSigningPropertyError("context", signingProperties.context);
    const config = throwSigningPropertyError("config", signingProperties.config);
    const authScheme = context.endpointV2?.properties?.authSchemes?.[0];
    const signerFunction = throwSigningPropertyError("signer", config.signer);
    const signer = await signerFunction(authScheme);
    const signingRegion = signingProperties?.signingRegion;
    const signingRegionSet = signingProperties?.signingRegionSet;
    const signingName = signingProperties?.signingName;
    return {
        config,
        signer,
        signingRegion,
        signingRegionSet,
        signingName,
    };
};
class AwsSdkSigV4Signer {
    async sign(httpRequest, identity, signingProperties) {
        if (!protocols.HttpRequest.isInstance(httpRequest)) {
            throw new Error("The request is not an instance of `HttpRequest` and cannot be signed");
        }
        const validatedProps = await validateSigningProperties(signingProperties);
        const { config, signer } = validatedProps;
        let { signingRegion, signingName } = validatedProps;
        const handlerExecutionContext = signingProperties.context;
        if (handlerExecutionContext?.authSchemes?.length ?? 0 > 1) {
            const [first, second] = handlerExecutionContext.authSchemes;
            if (first?.name === "sigv4a" && second?.name === "sigv4") {
                signingRegion = second?.signingRegion ?? signingRegion;
                signingName = second?.signingName ?? signingName;
            }
        }
        const signedRequest = await signer.sign(httpRequest, {
            signingDate: getSkewCorrectedDate(config.systemClockOffset),
            signingRegion: signingRegion,
            signingService: signingName,
        });
        return signedRequest;
    }
    errorHandler(signingProperties) {
        return (error) => {
            const serverTime = error.ServerTime ?? getDateHeader(error.$response);
            if (serverTime) {
                const config = throwSigningPropertyError("config", signingProperties.config);
                const initialSystemClockOffset = config.systemClockOffset;
                config.systemClockOffset = getUpdatedSystemClockOffset(serverTime, config.systemClockOffset);
                const clockSkewCorrected = config.systemClockOffset !== initialSystemClockOffset;
                if (clockSkewCorrected && error.$metadata) {
                    error.$metadata.clockSkewCorrected = true;
                }
            }
            throw error;
        };
    }
    successHandler(httpResponse, signingProperties) {
        const dateHeader = getDateHeader(httpResponse);
        if (dateHeader) {
            const config = throwSigningPropertyError("config", signingProperties.config);
            config.systemClockOffset = getUpdatedSystemClockOffset(dateHeader, config.systemClockOffset);
        }
    }
}
const AWSSDKSigV4Signer = AwsSdkSigV4Signer;

class AwsSdkSigV4ASigner extends AwsSdkSigV4Signer {
    async sign(httpRequest, identity, signingProperties) {
        if (!protocols.HttpRequest.isInstance(httpRequest)) {
            throw new Error("The request is not an instance of `HttpRequest` and cannot be signed");
        }
        const { config, signer, signingRegion, signingRegionSet, signingName } = await validateSigningProperties(signingProperties);
        const configResolvedSigningRegionSet = await config.sigv4aSigningRegionSet?.();
        const multiRegionOverride = (configResolvedSigningRegionSet ??
            signingRegionSet ?? [signingRegion]).join(",");
        const signedRequest = await signer.sign(httpRequest, {
            signingDate: getSkewCorrectedDate(config.systemClockOffset),
            signingRegion: multiRegionOverride,
            signingService: signingName,
        });
        return signedRequest;
    }
}

const getArrayForCommaSeparatedString = (str) => typeof str === "string" && str.length > 0 ? str.split(",").map((item) => item.trim()) : [];

const getBearerTokenEnvKey = (signingName) => `AWS_BEARER_TOKEN_${signingName.replace(/[\s-]/g, "_").toUpperCase()}`;

const NODE_AUTH_SCHEME_PREFERENCE_ENV_KEY = "AWS_AUTH_SCHEME_PREFERENCE";
const NODE_AUTH_SCHEME_PREFERENCE_CONFIG_KEY = "auth_scheme_preference";
const NODE_AUTH_SCHEME_PREFERENCE_OPTIONS = {
    environmentVariableSelector: (env, options) => {
        if (options?.signingName) {
            const bearerTokenKey = getBearerTokenEnvKey(options.signingName);
            if (bearerTokenKey in env)
                return ["httpBearerAuth"];
        }
        if (!(NODE_AUTH_SCHEME_PREFERENCE_ENV_KEY in env))
            return undefined;
        return getArrayForCommaSeparatedString(env[NODE_AUTH_SCHEME_PREFERENCE_ENV_KEY]);
    },
    configFileSelector: (profile) => {
        if (!(NODE_AUTH_SCHEME_PREFERENCE_CONFIG_KEY in profile))
            return undefined;
        return getArrayForCommaSeparatedString(profile[NODE_AUTH_SCHEME_PREFERENCE_CONFIG_KEY]);
    },
    default: [],
};

const resolveAwsSdkSigV4AConfig = (config) => {
    config.sigv4aSigningRegionSet = core.normalizeProvider(config.sigv4aSigningRegionSet);
    return config;
};
const NODE_SIGV4A_CONFIG_OPTIONS = {
    environmentVariableSelector(env) {
        if (env.AWS_SIGV4A_SIGNING_REGION_SET) {
            return env.AWS_SIGV4A_SIGNING_REGION_SET.split(",").map((_) => _.trim());
        }
        throw new config.ProviderError("AWS_SIGV4A_SIGNING_REGION_SET not set in env.", {
            tryNextLink: true,
        });
    },
    configFileSelector(profile) {
        if (profile.sigv4a_signing_region_set) {
            return (profile.sigv4a_signing_region_set ?? "").split(",").map((_) => _.trim());
        }
        throw new config.ProviderError("sigv4a_signing_region_set not set in profile.", {
            tryNextLink: true,
        });
    },
    default: undefined,
};

const resolveAwsSdkSigV4Config = (config) => {
    let inputCredentials = config.credentials;
    let isUserSupplied = !!config.credentials;
    let resolvedCredentials = undefined;
    Object.defineProperty(config, "credentials", {
        set(credentials) {
            if (credentials && credentials !== inputCredentials && credentials !== resolvedCredentials) {
                isUserSupplied = true;
            }
            inputCredentials = credentials;
            const memoizedProvider = normalizeCredentialProvider(config, {
                credentials: inputCredentials,
                credentialDefaultProvider: config.credentialDefaultProvider,
            });
            const boundProvider = bindCallerConfig(config, memoizedProvider);
            if (isUserSupplied && !boundProvider.attributed) {
                const isCredentialObject = typeof inputCredentials === "object" && inputCredentials !== null;
                resolvedCredentials = async (options) => {
                    const creds = await boundProvider(options);
                    const attributedCreds = creds;
                    if (isCredentialObject && (!attributedCreds.$source || Object.keys(attributedCreds.$source).length === 0)) {
                        return client.setCredentialFeature(attributedCreds, "CREDENTIALS_CODE", "e");
                    }
                    return attributedCreds;
                };
                resolvedCredentials.memoized = boundProvider.memoized;
                resolvedCredentials.configBound = boundProvider.configBound;
                resolvedCredentials.attributed = true;
            }
            else {
                resolvedCredentials = boundProvider;
            }
        },
        get() {
            return resolvedCredentials;
        },
        enumerable: true,
        configurable: true,
    });
    config.credentials = inputCredentials;
    const { signingEscapePath = true, systemClockOffset = config.systemClockOffset || 0, sha256, } = config;
    let signer;
    if (config.signer) {
        signer = core.normalizeProvider(config.signer);
    }
    else if (config.regionInfoProvider) {
        signer = () => core.normalizeProvider(config.region)()
            .then(async (region) => [
            (await config.regionInfoProvider(region, {
                useFipsEndpoint: await config.useFipsEndpoint(),
                useDualstackEndpoint: await config.useDualstackEndpoint(),
            })) || {},
            region,
        ])
            .then(([regionInfo, region]) => {
            const { signingRegion, signingService } = regionInfo;
            config.signingRegion = config.signingRegion || signingRegion || region;
            config.signingName = config.signingName || signingService || config.serviceId;
            const params = {
                ...config,
                credentials: config.credentials,
                region: config.signingRegion,
                service: config.signingName,
                sha256,
                uriEscapePath: signingEscapePath,
            };
            const SignerCtor = config.signerConstructor || signatureV4.SignatureV4;
            return new SignerCtor(params);
        });
    }
    else {
        signer = async (authScheme) => {
            authScheme = Object.assign({}, {
                name: "sigv4",
                signingName: config.signingName || config.defaultSigningName,
                signingRegion: await core.normalizeProvider(config.region)(),
                properties: {},
            }, authScheme);
            const signingRegion = authScheme.signingRegion;
            const signingService = authScheme.signingName;
            config.signingRegion = config.signingRegion || signingRegion;
            config.signingName = config.signingName || signingService || config.serviceId;
            const params = {
                ...config,
                credentials: config.credentials,
                region: config.signingRegion,
                service: config.signingName,
                sha256,
                uriEscapePath: signingEscapePath,
            };
            const SignerCtor = config.signerConstructor || signatureV4.SignatureV4;
            return new SignerCtor(params);
        };
    }
    const resolvedConfig = Object.assign(config, {
        systemClockOffset,
        signingEscapePath,
        signer,
    });
    return resolvedConfig;
};
const resolveAWSSDKSigV4Config = resolveAwsSdkSigV4Config;
function normalizeCredentialProvider(config, { credentials, credentialDefaultProvider, }) {
    let credentialsProvider;
    if (credentials) {
        if (!credentials?.memoized) {
            credentialsProvider = core.memoizeIdentityProvider(credentials, core.isIdentityExpired, core.doesIdentityRequireRefresh);
        }
        else {
            credentialsProvider = credentials;
        }
    }
    else {
        if (credentialDefaultProvider) {
            credentialsProvider = core.normalizeProvider(credentialDefaultProvider(Object.assign({}, config, {
                parentClientConfig: config,
            })));
        }
        else {
            credentialsProvider = async () => {
                throw new Error("@aws-sdk/core::resolveAwsSdkSigV4Config - `credentials` not provided and no credentialDefaultProvider was configured.");
            };
        }
    }
    credentialsProvider.memoized = true;
    return credentialsProvider;
}
function bindCallerConfig(config, credentialsProvider) {
    if (credentialsProvider.configBound) {
        return credentialsProvider;
    }
    const fn = async (options) => credentialsProvider({ ...options, callerClientConfig: config });
    fn.memoized = credentialsProvider.memoized;
    fn.configBound = true;
    return fn;
}

exports.AWSSDKSigV4Signer = AWSSDKSigV4Signer;
exports.AwsSdkSigV4ASigner = AwsSdkSigV4ASigner;
exports.AwsSdkSigV4Signer = AwsSdkSigV4Signer;
exports.NODE_AUTH_SCHEME_PREFERENCE_OPTIONS = NODE_AUTH_SCHEME_PREFERENCE_OPTIONS;
exports.NODE_SIGV4A_CONFIG_OPTIONS = NODE_SIGV4A_CONFIG_OPTIONS;
exports.getBearerTokenEnvKey = getBearerTokenEnvKey;
exports.resolveAWSSDKSigV4Config = resolveAWSSDKSigV4Config;
exports.resolveAwsSdkSigV4AConfig = resolveAwsSdkSigV4AConfig;
exports.resolveAwsSdkSigV4Config = resolveAwsSdkSigV4Config;
exports.validateSigningProperties = validateSigningProperties;
