index.js

#!/usr/bin/env node

const core = require("@actions/core");
const { context, getOctokit } = require("@actions/github");

async function run() {
    try {
        const githubToken = core.getInput('github_token');

        let labelsByOrganizationInput = core.getInput('labels_by_organization');

        if (!labelsByOrganizationInput) {
            core.setFailed("At least the labels_by_organization parameter must be set!");
            return;
        }

        const labelsByOrganization = new Map(Object.entries(JSON.parse(labelsByOrganizationInput)))

        const [owner, repo] = core.getInput('repository').split('/');
        const issueNumber =
            core.getInput('issue_number') === ''
                ? context.issue.number
                : parseInt(core.getInput('issue_number'));

        const target = context.payload.pull_request || context.payload.issue
        const author = target.user.login
        console.log(`author : ${author}`);

        if (!issueNumber) {
            core.setFailed("Cannot infer the target issue parameter!");
            return;
        }

        const client = getOctokit(githubToken);

        const remainingAdd = [];
        labelsByOrganization.forEach(async (value, key) => {
            await client.rest.orgs.listMembers({org: key}).then((listMembers) => {
                listMembers.data.forEach(async (member) => {
                    if (member.login === author) {
                        for (const label of value) {
                            try {
                                await client.rest.issues.addLabels({
                                    labels: [label],
                                    owner,
                                    repo,
                                    issue_number: issueNumber
                                });
                            } catch (e) {
                                core.warning(`failed to add label: ${label}: ${e}`);
                                remainingAdd.push(label);
                            }
                        }
                    }
                })
            });
        });

        if (remainingAdd.length) {
            throw new Error(`failed to add labels: ${remainingAdd}`);
        }
    } catch (e) {
        core.error(e);
    }
}

run();