Add support of allow free url config option with correspond modifications

Author: jackycute

README.md

@@ -119,6 +119,7 @@ Environment variables (will overwrite other server configs)
 | HMD_URL_ADDPORT | `true` or `false` | set to add port on callback url (port 80 or 443 won't applied) (only applied when domain is set) |
 | HMD_USECDN | `true` or `false` | set to use CDN resources or not (default is `true`) |
 | HMD_ALLOW_ANONMYOUS | `true` or `false` | set to allow anonmyous usage (default is `true`) |
+| HMD_ALLOW_FREEURL | `true` or `false` | set to allow new note by accessing not exist note url |
 | HMD_FACEBOOK_CLIENTID | no example | Facebook API client id |
 | HMD_FACEBOOK_CLIENTSECRET | no example | Facebook API client secret |
 | HMD_TWITTER_CONSUMERKEY | no example | Twitter API consumer key |
@@ -155,6 +156,7 @@ Server settings `config.json`
 | urladdport | `true` or `false` | set to add port on callback url (port 80 or 443 won't applied) (only applied when domain is set) |
 | usecdn | `true` or `false` | set to use CDN resources or not (default is `true`) |
 | allowanonmyous | `true` or `false` | set to allow anonmyous usage (default is `true`) |
+| allowfreeurl | `true` or `false` | set to allow new note by accessing not exist note url |
 | db | `{ "dialect": "sqlite", "storage": "./db.hackmd.sqlite" }` | set the db configs, [see more here](http://sequelize.readthedocs.org/en/latest/api/sequelize/) |
 | sslkeypath | `./cert/client.key` | ssl key path (only need when you set usessl) |
 | sslcertpath | `./cert/hackmd_io.crt` | ssl cert path (only need when you set usessl) |

lib/config.js

@@ -21,6 +21,8 @@ var usecdn = process.env.HMD_USECDN ? (process.env.HMD_USECDN === 'true') : ((ty
 
 var allowanonmyous = process.env.HMD_ALLOW_ANONMYOUS ? (process.env.HMD_ALLOW_ANONMYOUS === 'true') : ((typeof config.allowanonmyous === 'boolean') ? config.allowanonmyous : true);
 
+var allowfreeurl = process.env.HMD_ALLOW_FREEURL ? (process.env.HMD_ALLOW_FREEURL === 'true') : !!config.allowfreeurl;
+
 // db
 var db = config.db || {
     dialect: 'sqlite',
@@ -128,6 +130,7 @@ module.exports = {
     serverurl: getserverurl(),
     usecdn: usecdn,
     allowanonmyous: allowanonmyous,
+    allowfreeurl: allowfreeurl,
     db: db,
     sslkeypath: path.join(cwd, sslkeypath),
     sslcertpath: path.join(cwd, sslcertpath),

lib/response.js

@@ -112,7 +112,8 @@ function newNote(req, res, next) {
         return response.errorForbidden(res);
     }
     models.Note.create({
-        ownerId: owner
+        ownerId: owner,
+        alias: req.alias ? req.alias : null
     }).then(function (note) {
         return res.redirect(config.serverurl + "/" + LZString.compressToBase64(note.id));
     }).catch(function (err) {
@@ -133,6 +134,7 @@ function checkViewPermission(req, note) {
 }
 
 function findNote(req, res, callback, include) {
+    var noteId = req.params.noteId;
     var id = req.params.noteId || req.params.shortid;
     models.Note.parseNoteId(id, function (err, _id) {
         models.Note.findOne({
@@ -142,7 +144,12 @@ function findNote(req, res, callback, include) {
             include: include || null
         }).then(function (note) {
             if (!note) {
-                return response.errorNotFound(res);
+                if (config.allowfreeurl && noteId) {
+                    req.alias = noteId;
+                    return newNote(req, res);
+                } else {
+                    return response.errorNotFound(res);
+                }
             }
             if (!checkViewPermission(req, note)) {
                 return response.errorForbidden(res);