[MM-46305] Add reporting code for E2E tests (#2222)

* E2E reporting

* Test report

* Fix artifacts.js

* Revert "Test report"

This reverts commit f4d44b881a19c0e9d63066807f5cb6b9fe9017ee.

* PR feedback

e2e/utils/artifacts.js

@@ -0,0 +1,90 @@
+// Copyright (c) 2016-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+
+/* eslint-disable no-console,consistent-return */
+
+const fs = require('fs');
+
+const path = require('path');
+
+const async = require('async');
+const AWS = require('aws-sdk');
+const mime = require('mime-types');
+const readdir = require('recursive-readdir');
+
+const {MOCHAWESOME_REPORT_DIR} = require('./constants');
+
+require('dotenv').config();
+
+const {
+    AWS_S3_BUCKET,
+    AWS_ACCESS_KEY_ID,
+    AWS_SECRET_ACCESS_KEY,
+    BUILD_ID,
+    BRANCH,
+    BUILD_TAG,
+} = process.env;
+
+const s3 = new AWS.S3({
+    signatureVersion: 'v4',
+    accessKeyId: AWS_ACCESS_KEY_ID,
+    secretAccessKey: AWS_SECRET_ACCESS_KEY,
+});
+
+function getFiles(dirPath) {
+    return fs.existsSync(dirPath) ? readdir(dirPath) : [];
+}
+
+async function saveArtifacts() {
+    if (!AWS_S3_BUCKET || !AWS_ACCESS_KEY_ID || !AWS_SECRET_ACCESS_KEY) {
+        console.log('No AWS credentials found. Test artifacts not uploaded to S3.');
+
+        return;
+    }
+
+    const s3Folder = `${BUILD_ID}-${BRANCH}-${BUILD_TAG}`.replace(/\./g, '-');
+    const uploadPath = path.resolve(__dirname, `../../${MOCHAWESOME_REPORT_DIR}`);
+    const filesToUpload = await getFiles(uploadPath);
+
+    return new Promise((resolve, reject) => {
+        async.eachOfLimit(
+            filesToUpload,
+            10,
+            async.asyncify(async (file) => {
+                const Key = file.replace(uploadPath, s3Folder);
+                const contentType = mime.lookup(file);
+                const charset = mime.charset(contentType);
+
+                return new Promise((res, rej) => {
+                    s3.upload(
+                        {
+                            Key,
+                            Bucket: AWS_S3_BUCKET,
+                            Body: fs.readFileSync(file),
+                            ContentType: `${contentType}${charset ? '; charset=' + charset : ''}`,
+                        },
+                        (err) => {
+                            if (err) {
+                                console.log('Failed to upload artifact:', file);
+                                return rej(new Error(err));
+                            }
+                            res({success: true});
+                        },
+                    );
+                });
+            }),
+            (err) => {
+                if (err) {
+                    console.log('Failed to upload artifacts');
+                    return reject(new Error(err));
+                }
+
+                const reportLink = `https://${AWS_S3_BUCKET}.s3.amazonaws.com/${s3Folder}/mochawesome.html`;
+                resolve({success: true, reportLink});
+            },
+        );
+    });
+}
+
+module.exports = {saveArtifacts};