extract createFolder method

browser/main/lib/dataApi/createFolder.js

@@ -0,0 +1,86 @@
+const _ = require('lodash')
+const sander = require('sander')
+const keygen = require('browser/lib/keygen')
+const path = require('path')
+
+const defaultDataJSON = {
+  notes: []
+}
+
+/**
+ * @param {String} storageKey
+ * @param {Object} input
+ * ```
+ * {
+ *   color: String,
+ *   name: String
+ * }
+ * ```
+ *
+ * @return {key}
+ */
+function createFolder (storageKey, input) {
+  let rawStorages
+  let targetStorage
+  try {
+    if (input == null) throw new Error('No input found.')
+    if (!_.isString(input.name)) throw new Error('Name must be a string.')
+    if (!_.isString(input.color)) throw new Error('Color must be a string.')
+
+    rawStorages = JSON.parse(localStorage.getItem('storages'))
+    if (!_.isArray(rawStorages)) throw new Error('Target storage doesn\'t exist.')
+
+    targetStorage = _.find(rawStorages, {key: storageKey})
+    if (targetStorage == null) throw new Error('Target storage doesn\'t exist.')
+  } catch (e) {
+    return Promise.reject(e)
+  }
+
+  const storageData = Object.assign({}, targetStorage)
+
+  const boostnoteJSONPath = path.join(targetStorage.path, 'boostnote.json')
+  return Promise.resolve()
+    .then(function fetchBoostnoteJSON () {
+      return sander.readFile(boostnoteJSONPath)
+    })
+    .then(function updateBoostnoteJSON (data) {
+      let boostnoteJSON
+      // If `boostnote.json` is invalid, reset `boostnote.json`.
+      try {
+        boostnoteJSON = JSON.parse(data)
+        if (!_.isArray(boostnoteJSON.folders)) throw new Error('the value of `folders` must be array')
+      } catch (err) {
+        boostnoteJSON = {
+          folders: []
+        }
+      }
+
+      let key = keygen()
+      while (boostnoteJSON.folders.some((folder) => folder.key === key)) {
+        key = keygen()
+      }
+
+      let newFolder = {
+        key,
+        color: input.color,
+        name: input.name
+      }
+      boostnoteJSON.folders.push(newFolder)
+
+      storageData.folders = boostnoteJSON.folders
+
+      return sander.writeFile(boostnoteJSONPath, JSON.stringify(boostnoteJSON))
+        .then(() => newFolder)
+    })
+    .then(function createDataJSON (newFolder) {
+      const folderDirPath = path.join(targetStorage.path, newFolder.key)
+      return sander.writeFile(folderDirPath, 'data.json', JSON.stringify(defaultDataJSON))
+    })
+    .then(function returnData () {
+      return {
+        storage: storageData
+      }
+    })
+}
+
+module.exports = createFolder