src/strapp.js

   1 /**
   2 * @file      Strapp main driver
   3 * @author    Jordan Lavatai, Ken Grimes
   4 * @version   0.0.4
   5 * @license   AGPL-3.0
   6 * @copyright August 2017 - Ken Grimes, Jordan Lavatai
   7 * @summmary  Bootstrapper for the strapp.io mechanism
   8 */
   9
  10 const StrappFile = (() => {
  11   const authorize = (pubKey, mode, stat) => {
  12     let allowed
  13     if (pubKey === stat.owner)
  14       allowed = (stat.perms >>> 16) & 0xF
  15     else {
  16       let gAccess = false
  17       let uGroups = StrappFile.get(`acct/${pubKey}/groups`).split(' ')
  18       for (let i = 0; i < uGroups.length; i++) {
  19         if (uGroups[i] === stat.group) {
  20           gAccess = true
  21           break
  22         }
  23       }
  24       if (gAccess)
  25         allowed = (stat.perms >>> 8) & 0xF
  26       else
  27         allowed = stat.perms & 0xF
  28     }
  29     switch(mode){
  30     case 'r+':
  31     case 'rw':
  32     case 'wr':
  33       return (allowed & 0x6) === 0x6
  34     case 'w':
  35       return (allowed & 0x2) === 0x2
  36     case 'r':
  37       return (allowed & 0x4) === 0x4
  38     case 'x':
  39       return (allowed & 0x1) === 0x1
  40     default:
  41       console.log(`Unknown access mode: ${mode}`)
  42       return false
  43     }
  44   }
  45   class StrappFile extends Object {
  46     constructor(...props) {
  47       super()
  48       return Object.assign(this, new.target.defaults, ...props)
  49     }
  50     static PermissionDenied() {
  51       return new Promise((resolve, reject) => reject('Permission denied'))
  52     }
  53     HEAD(opt) {
  54       if (authorize(opt.pubKey, 'r', this.stat))
  55         return new Promise((resolve, reject) => resolve(''))
  56       else
  57         return StrappFile.PermissionDenied()
  58     }
  59     GET(opt) {
  60       if (authorize(opt.pubKey, 'r', this.stat))
  61         return StrappFile.get(this.path)
  62       else return StrappFile.PermissionDenied()
  63     }
  64     PUT(opt) {
  65       if (authorize(opt.pubKey, 'w', this.stat))
  66         return StrappFile.set(this.path, opt.data)
  67       else return StrappFile.PermissionDenied()
  68     }
  69     POST(opt) {
  70       return this.PUT(Object.assign(opt, { data: this.GET(opt) + opt.data }))
  71     }
  72     DELETE(opt) {
  73       if (authorize(opt.pubKey, 'w', this.stat))
  74         return StrappFile.delete(this.path)
  75       else return StrappFile.PermissionDenied()
  76     }
  77     OPTIONS(opt) {
  78       return this.stat
  79     }
  80     CONNECT(opt) {
  81       return this.GET(opt)
  82     }
  83     TRACE(opt) {
  84     }
  85     PATCH(opt) {
  86     }
  87   }
  88   StrappFile.defaults = {
  89     type: 'mime/type',
  90     perm: 0,
  91     owner: 'thisOwnerPubKey',
  92     group: 'groupname',
  93     changed: 'time',
  94     created: 'time',
  95     accessed: 'time - not saved'
  96   }
  97   return StrappFile
  98 })()