order sharing

snapshare.js

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+import {PutObjectCommand, S3Client} from "@aws-sdk/client-s3";
+import cors from 'cors'
+import {urlencoded} from "express";
+import crypto from "crypto";
+
+const SNAPSHOT_URL = process.env.DEXORDER_SNAPSHOT_URL;
+const APP_URL = process.env.DEXORDER_APP_URL;
+
+const S3_BUCKET = process.env.DEXORDER_SNAPSHOT_S3_BUCKET_NAME;
+const S3_ACCESS_KEY_ID = process.env.DEXORDER_SNAPSHOT_S3_ACCESS_KEY_ID;
+const S3_SECRET_ACCESS_KEY = process.env.DEXORDER_SNAPSHOT_S3_SECRET_ACCESS_KEY;
+const S3_ENDPOINT = process.env.DEXORDER_SNAPSHOT_S3_ENDPOINT; // e.g., 'https://<ACCOUNT_ID>.r2.cloudflarestorage.com/'
+
+const s3 = new S3Client({
+    region: "auto",
+    endpoint: S3_ENDPOINT,
+    credentials: {
+        accessKeyId: S3_ACCESS_KEY_ID,
+        secretAccessKey: S3_SECRET_ACCESS_KEY,
+    }
+});
+
+
+export function initSnapShare(app) {
+    // this URL is called by the frontend to upload a snapshot image for use on a share page
+    app.put('/snapshot', cors({origin: process.env.DEXORDER_APP_URL}),
+        (req, res) => {
+            const chunks = [];
+            req.on('data', chunk => chunks.push(chunk))
+            req.on('error', (err) => res.status(500).send('Error reading body'))
+            req.on('end', () => {
+                const filename = crypto.randomUUID() + '.png';
+                const body = Buffer.concat(chunks);
+                s3.send(new PutObjectCommand({
+                    Bucket: S3_BUCKET,
+                    Key: filename,
+                    Body: body,
+                    ContentType: 'image/png',
+                    ACL: 'public-read', // or private, depending on your needs
+                })).then(sent => {
+                    res.send(filename)
+                }).catch(err => {
+                    console.log('upload error', err)
+                    res.status(500).send('error')
+                });
+            });
+        });
+
+    // this link returns a "share page" that shows the snapshot of the trade setup then redirects
+    // to the order page with the trade data loaded from the URL
+    app.get('/share', (req, res) => {
+        console.log('request', req)
+        const imageFilename = req.query.i; // c = snapshot code
+        const data = {
+            imageUrl: SNAPSHOT_URL + '/' + imageFilename,
+            redirectUrl: APP_URL + '/share?d=' + urlencoded(req.query.d), // d=data
+        };
+        res.render('share', data);
+    });
+
+}