Better dev server integration

server/utils/getMetadata.js

@@ -0,0 +1,74 @@
+const fs = require("fs")
+const path = require("path")
+const SRIToolbox = require("sri-toolbox")
+const getFileContentType = require("./getFileContentType")
+const getFileStats = require("./getFileStats")
+const getFileType = require("./getFileType")
+
+function getEntries(dir, file, maximumDepth) {
+  return new Promise((resolve, reject) => {
+    fs.readdir(path.join(dir, file), function(error, files) {
+      if (error) {
+        reject(error)
+      } else {
+        resolve(
+          Promise.all(files.map(f => getFileStats(path.join(dir, file, f)))).then(statsArray => {
+            return Promise.all(
+              statsArray.map((stats, index) =>
+                getMetadataRecursive(dir, path.join(file, files[index]), stats, maximumDepth - 1)
+              )
+            )
+          })
+        )
+      }
+    })
+  })
+}
+
+function formatTime(time) {
+  return new Date(time).toISOString()
+}
+
+function getIntegrity(file) {
+  return new Promise((resolve, reject) => {
+    fs.readFile(file, function(error, data) {
+      if (error) {
+        reject(error)
+      } else {
+        resolve(SRIToolbox.generate({ algorithms: ["sha384"] }, data))
+      }
+    })
+  })
+}
+
+function getMetadataRecursive(dir, file, stats, maximumDepth) {
+  const metadata = {
+    lastModified: formatTime(stats.mtime),
+    contentType: getFileContentType(file),
+    path: file,
+    size: stats.size,
+    type: getFileType(stats)
+  }
+
+  if (stats.isFile()) {
+    return getIntegrity(path.join(dir, file)).then(integrity => {
+      metadata.integrity = integrity
+      return metadata
+    })
+  }
+
+  if (!stats.isDirectory() || maximumDepth === 0) return Promise.resolve(metadata)
+
+  return getEntries(dir, file, maximumDepth).then(files => {
+    metadata.files = files
+    return metadata
+  })
+}
+
+function getMetadata(baseDir, path, stats, maximumDepth, callback) {
+  getMetadataRecursive(baseDir, path, stats, maximumDepth).then(function(metadata) {
+    callback(null, metadata)
+  }, callback)
+}
+
+module.exports = getMetadata