server added

index.js

@@ -0,0 +1,88 @@
+const request = require('request')
+const sharp = require('sharp')
+const { MongoClient, ObjectId } = require('mongodb')
+const express = require('express')
+const app = express()
+const fs = require('fs')
+const path = require('path')
+const cors = require('cors')
+
+// const resizeBox = sharp().resize(512).png()
+
+const CTX = {
+  dbHandler: null
+}
+
+const CFG = {
+  port: process.env.PORT || 3000
+}
+
+app.use(cors())
+
+app.get('/preview/:id', function (req, res) {
+  CTX.dbHandler
+    .collection('hboxes')
+    .find({_id: ObjectId(req.params.id)})
+    .project({preview: 1})
+    .limit(1)
+    .next(function (pErr, pDoc) {
+      if (pErr) {
+        return res.status(404).json(pErr)
+      }
+      downloadBox(pDoc._id, pDoc.preview.secure_url, res)
+    })
+})
+
+app.use('/', express.static('webapp'))
+
+MongoClient.connect('mongodb://localhost:27017', { useNewUrlParser: true }, function (pErr, pDbHandler) {
+  if (pErr) {
+    console.error(pErr)
+    process.exit(1)
+  }
+
+  CTX.dbHandler = pDbHandler.db('hortus-box')
+
+  app.listen(CFG.port, function () {
+    console.log(`[>] pwa-server running on ${CFG.port}`)
+  })
+})
+
+function downloadBox (pId, pUrl, res) {
+  let cachePath = path.join('./cache', `${pId}.png`)
+
+  fs.access(cachePath, fs.constants.F_OK, function (pErr) {
+    if (pErr) {
+      let wstream = fs.createWriteStream(cachePath)
+      request(pUrl).pipe(wstream)
+      wstream.on('finish', function () {
+        resizeBox(pId, cachePath, res)
+      })
+    } else {
+      resizeBox(pId, cachePath, res)
+    }
+  })
+}
+
+function resizeBox (pId, pCachePath, res) {
+  let previewPath = path.join('./cache', `${pId}.preview.png`)
+
+  fs.access(previewPath, fs.constants.F_OK, function (pErr) {
+    if (pErr) {
+      sharp(pCachePath)
+        .resize(512)
+        .toFile(previewPath, function (pErr, info) {
+          if (pErr) {
+            return res.status(404).json(pErr)
+          }
+          sendBox(previewPath, res)
+        })
+    } else {
+      sendBox(previewPath, res)
+    }
+  })
+}
+
+function sendBox (pPreviewPath, res) {
+  fs.createReadStream(pPreviewPath).pipe(res)
+}

package.json

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+{
+  "name": "pwa-server",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "cors": "^2.8.5",
+    "express": "^4.16.4",
+    "mongodb": "^3.2.3",
+    "request": "^2.88.0",
+    "sharp": "^0.22.0"
+  }
+}