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s3upload.js

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+var aws = require("aws-sdk");
+require("dotenv").config();
+// Configure aws with your accessKeyId and your secretAccessKey
+aws.config.update({
+  region: "ca-central-1", // Put your aws region here
+  accessKeyId: process.env.AWSAccessKeyId,
+  secretAccessKey: process.env.AWSSecretKey
+});
+
+const S3_BUCKET = process.env.bucket;
+// Now lets export this function so we can call it from somewhere else
+
+exports.sign_s3 = (req, res) => {
+  console.log("Hitting bucket:  " + S3_BUCKET);
+  const s3 = new aws.S3(); // Create a new instance of S3
+  if (!req.body.fileName || req.body.fileType) {
+    res.json({ success: false, error: "fileName or fileType missing." });
+    console.log("Error: fileName or fileType missing. ");
+    return;
+  }
+
+  const fileName = req.body.fileName;
+  const fileType = req.body.fileType;
+  // Set up the payload of what we are sending to the S3 api
+  const s3Params = {
+    Bucket: S3_BUCKET,
+    Key: fileName,
+    Expires: 500,
+    ContentType: fileType,
+    ACL: "public-read"
+  };
+  // Make a request to the S3 API to get a signed URL which we can use to upload our file
+  s3.getSignedUrl("putObject", s3Params, (err, data) => {
+    if (err) {
+      console.log(err);
+      res.json({ success: false, error: err });
+    }
+    // Data payload of what we are sending back, the url of the signedRequest and a URL where we can access the content after its saved.
+    const returnData = {
+      signedRequest: data,
+      url: `https://${S3_BUCKET}.s3.amazonaws.com/${fileName}`
+    };
+    // Send it all back
+    res.json({ success: true, data: { returnData } });
+  });
+};