public static async GetSessionId(
     feedId: string,
     project: string,
     protocol: string,
     baseUrl: string,
     handlers: VsoBaseInterfaces.IRequestHandler[],
     options: VsoBaseInterfaces.IRequestOptions): Promise<string> {
            
     const publishPackageMetadata = tl.getInput("publishPackageMetadata");
     let shouldCreateSession = publishPackageMetadata && publishPackageMetadata.toLowerCase() == 'true';
     if (shouldCreateSession) {
         const useSessionEnabled = tl.getVariable("Packaging.SavePublishMetadata");
         shouldCreateSession = shouldCreateSession && !(useSessionEnabled && useSessionEnabled.toLowerCase() == 'false')
     }
     if (shouldCreateSession) {
         tl.debug("Creating provenance session to save pipeline metadata. This can be disabled in the task settings, or by setting build variable Packaging.SavePublishMetadata to false");
         const prov = new ProvenanceApi(baseUrl, handlers, options);
         const sessionRequest = ProvenanceHelper.CreateSessionRequest(feedId);
         try {
             const session = await prov.createSession(sessionRequest, protocol, project);
             return session.sessionId;
         } catch (error) {
             tl.warning(tl.loc("Warning_SessionCreationFailed", JSON.stringify(error)));
         }
     }
     return feedId;
 }

//.........这里部分代码省略.........

        let sessionId: string;

        if (feedType === "internal")
        {
            // getting inputs
            serviceUri = tl.getEndpointUrl("SYSTEMVSSCONNECTION", false);

            packageName = tl.getInput("packageListPublish");
            feedId = tl.getInput("feedListPublish");

            // Setting up auth info
            accessToken = pkgLocationUtils.getSystemAccessToken();
            internalAuthInfo = new auth.InternalAuthInfo([], accessToken);

            toolRunnerOptions.env.UNIVERSAL_PUBLISH_PAT = internalAuthInfo.accessToken;

            let packagingLocation: string;
            try {
                // This call is to get the packaging URI(abc.pkgs.vs.com) which is same for all protocols.
                packagingLocation = await pkgLocationUtils.getNuGetUriFromBaseServiceUri(
                    serviceUri,
                    accessToken);
            } catch (error) {
                tl.debug(JSON.stringify(error));
                packagingLocation = serviceUri;
            }

            const pkgConn = pkgLocationUtils.getWebApiWithProxy(packagingLocation, accessToken);
            sessionId = await ProvenanceHelper.GetSessionId(
                feedId,
                null,
                "upack", /* must match protocol name on the server */
                pkgConn.serverUrl,
                [pkgConn.authHandler],
                pkgConn.options);
        }
        else {
            const externalAuthInfo = auth.GetExternalAuthInfo("externalEndpoints");
            if (!externalAuthInfo)
            {
                tl.setResult(tl.TaskResult.Failed, tl.loc("Error_NoSourceSpecifiedForPublish"));
                return;
            }

            serviceUri = externalAuthInfo.packageSource.accountUrl;

            feedId = tl.getInput("feedPublishExternal");
            packageName = tl.getInput("packagePublishExternal");

            // Assuming only auth via PAT works for now
            accessToken = (externalAuthInfo as auth.TokenExternalAuthInfo).token;
            toolRunnerOptions.env.UNIVERSAL_PUBLISH_PAT = accessToken;
        }

        if (versionRadio === "custom"){
            version = tl.getInput("versionPublish");
        }
        else{
            feedUri = await pkgLocationUtils.getFeedUriFromBaseServiceUri(serviceUri, accessToken);

            const highestVersion = await artifactToolUtilities.getHighestPackageVersionFromFeed(
                feedUri,
                accessToken,
                feedId,
                packageName);

            version = artifactToolUtilities.getVersionUtility(tl.getInput("versionPublishSelector"), highestVersion);
        }
        tl.debug(tl.loc("Info_UsingArtifactToolPublish"));

        if (sessionId != null) {
            feedId = sessionId;
        }

        // tslint:disable-next-line:no-object-literal-type-assertion
        const publishOptions = {
            artifactToolPath,
            feedId,
            accountUrl: serviceUri,
            packageName,
            packageVersion: version,
        } as artifactToolRunner.IArtifactToolOptions;

        publishPackageUsingArtifactTool(publishDir, publishOptions, toolRunnerOptions);
        if(publishedPackageVar) {
            tl.setVariable(publishedPackageVar, `${packageName} ${version}`);
        }

        tl.setResult(tl.TaskResult.Succeeded, tl.loc("PackagesPublishedSuccessfully"));
    } catch (err) {
        tl.error(err);

        if (buildIdentityDisplayName || buildIdentityAccount) {
            tl.warning(tl.loc("BuildIdentityPermissionsHint", buildIdentityDisplayName, buildIdentityAccount));
        }

        tl.setResult(tl.TaskResult.Failed, tl.loc("PackagesFailedToPublish"));
    }
}

async function main(): Promise<void> {
    tl.setResourcePath(path.join(__dirname, "task.json"));

    try {
        let packagingLocation: string;

        let pipEnvVar: string = "";
        if (tl.getVariable("PIP_EXTRA_INDEX_URL")) {
            pipEnvVar = tl.getVariable("PIP_EXTRA_INDEX_URL");
        }

        const feedIds  = tl.getDelimitedInput("feedList", ",");
        const serverType = tl.getVariable("System.ServerType");

        // Local feeds
        if (feedIds)
        {
            if (!serverType || serverType.toLowerCase() !== "hosted"){
                throw new Error(tl.loc("Error_PythonInternalFeedsNotSupportedOnprem"));
            }
            tl.debug(tl.loc("Info_AddingInternalFeeds", feedIds.length));
            const serviceUri = tl.getEndpointUrl("SYSTEMVSSCONNECTION", false);
            const localAccessToken = pkgLocationUtils.getSystemAccessToken();
            try {
                // This call is to get the packaging URI(abc.pkgs.vs.com) which is same for all protocols.
                packagingLocation = await pkgLocationUtils.getNuGetUriFromBaseServiceUri(
                    serviceUri,
                    localAccessToken);
            } catch (error) {
                tl.debug(tl.loc("FailedToGetPackagingUri"));
                tl.debug(JSON.stringify(error));
                packagingLocation = serviceUri;
            }

            for (const feedId of feedIds) {
                const feedUri = await pkgLocationUtils.getFeedRegistryUrl(
                    packagingLocation, 
                    pkgLocationUtils.RegistryType.PyPiSimple, 
                    feedId,
                    null,
                    localAccessToken);
                const pipUri = utils.formPipCompatibleUri("build", localAccessToken, feedUri);
                pipEnvVar = pipEnvVar + " " + pipUri;
            }
        }

        // external service endpoints
        let endpointNames = tl.getDelimitedInput("externalSources", ',');

        const externalEndpoints = auth.getExternalAuthInfoArray(endpointNames);
        externalEndpoints.forEach((id) => {
            const externalPipUri = utils.formPipCompatibleUri(id.username, id.password, id.packageSource.feedUri);
            pipEnvVar = pipEnvVar + " " + externalPipUri;
        });

        // Setting variable
        tl.setVariable("PIP_EXTRA_INDEX_URL", pipEnvVar, false);
        console.log(tl.loc("Info_SuccessAddingAuth", feedIds.length, externalEndpoints.length));

        const pipauthvar = tl.getVariable("PIP_EXTRA_INDEX_URL");
        if (pipauthvar.length < pipEnvVar.length){
            tl.warning(tl.loc("Warn_TooManyFeedEntries"));
        }
        tl.debug(pipEnvVar);
    }
    catch (error) {
        tl.error(error);
        tl.setResult(tl.TaskResult.Failed, tl.loc("FailedToAddAuthentication"));
        return;
    } finally{
        _logPipAuthStartupVariables();
    }
}

export async function run(artifactToolPath: string): Promise<void> {
    let buildIdentityDisplayName: string = null;
    let buildIdentityAccount: string = null;
    try {
        // Get directory to publish
        let downloadDir: string = tl.getInput("downloadDirectory");
        if (downloadDir.length < 1)
        {
            tl.warning(tl.loc("Info_DownloadDirectoryNotFound"));
            return;
        }

        let serviceUri: string;
        let feedId: string;
        let packageName: string;
        let version: string;

        // Feed Auth
        let feedType = tl.getInput("internalOrExternalDownload") || "internal";

        const normalizedFeedType = ["internal", "external"].find((x) =>
            feedType.toUpperCase() === x.toUpperCase());
        if (!normalizedFeedType) {
            throw new Error(tl.loc("UnknownFeedType", feedType));
        }
        feedType = normalizedFeedType;

        let internalAuthInfo: auth.InternalAuthInfo;

        let toolRunnerOptions = artifactToolRunner.getOptions();

        if (feedType === "internal")
        {
            // getting inputs
            serviceUri = tl.getEndpointUrl("SYSTEMVSSCONNECTION", false);

            feedId = tl.getInput("feedListDownload");

            // Getting package name from package Id
            const packageId = tl.getInput("packageListDownload");
            const accessToken = pkgLocationUtils.getSystemAccessToken();

            internalAuthInfo = new auth.InternalAuthInfo([], accessToken);

            const feedUri = await pkgLocationUtils.getFeedUriFromBaseServiceUri(serviceUri, accessToken);
            packageName = await artifactToolUtilities.getPackageNameFromId(feedUri, accessToken, feedId, packageId);

            version = tl.getInput("versionListDownload");

            toolRunnerOptions.env.UNIVERSAL_DOWNLOAD_PAT = internalAuthInfo.accessToken;
        }
        else {
            let externalAuthInfo = auth.GetExternalAuthInfo("externalEndpoint");

            if (!externalAuthInfo)
            {
                tl.setResult(tl.TaskResult.Failed, tl.loc("Error_NoSourceSpecifiedForDownload"));
                return;
            }

            serviceUri = externalAuthInfo.packageSource.accountUrl;
            feedId = tl.getInput("feedDownloadExternal");
            packageName = tl.getInput("packageDownloadExternal");
            version = tl.getInput("versionDownloadExternal");

            // Assuming only auth via PAT works for now
            const tokenAuth = externalAuthInfo as auth.TokenExternalAuthInfo;
            toolRunnerOptions.env.UNIVERSAL_DOWNLOAD_PAT = tokenAuth.token;
        }

        tl.debug(tl.loc("Info_UsingArtifactToolDownload"));

        const downloadOptions = {
            artifactToolPath,
            feedId,
            accountUrl: serviceUri,
            packageName,
            packageVersion: version,
        } as artifactToolRunner.IArtifactToolOptions;

        downloadPackageUsingArtifactTool(downloadDir, downloadOptions, toolRunnerOptions);

        tl.setResult(tl.TaskResult.Succeeded, tl.loc("PackagesDownloadedSuccessfully"));

    } catch (err) {
        tl.error(err);

        if (buildIdentityDisplayName || buildIdentityAccount) {
            tl.warning(tl.loc("BuildIdentityPermissionsHint", buildIdentityDisplayName, buildIdentityAccount));
        }

        tl.setResult(tl.TaskResult.Failed, tl.loc("PackagesFailedToDownload"));
    }
}