cli/defaults/siteConfig.json

@@ -18,7 +18,8 @@
     "host": "https://www.example.com",
     "description": "A decentralized hosting platform built on LBRY",
     "twitter": false,
-    "blockListEndpoint": "https://api.lbry.com/file/list_blocked"
+    "blockListEndpoint": "https://api.lbry.com/file/list_blocked",
+    "corsWhitelist": []
   },
   "publishing": {
     "primaryClaimAddress": null,

package-lock.json

@@ -3611,6 +3611,15 @@
       "resolved": "https://registry.npmjs.org/core-util-is/-/core-util-is-1.0.2.tgz",
       "integrity": "sha1-tf1UIgqivFq1eqtxQMlAdUUDwac="
     },
+    "cors": {
+      "version": "2.8.5",
+      "resolved": "https://registry.npmjs.org/cors/-/cors-2.8.5.tgz",
+      "integrity": "sha512-KIHbLJqu73RGr/hnbrO9uBeixNGuvSQjul/jdFvS/KFSIH1hWVd1ng7zOHx+YrEfInLG7q4n6GHQ9cDtxv/P6g==",
+      "requires": {
+        "object-assign": "^4",
+        "vary": "^1"
+      }
+    },
     "cosmiconfig": {
       "version": "5.0.7",
       "resolved": "https://registry.npmjs.org/cosmiconfig/-/cosmiconfig-5.0.7.tgz",
@@ -8605,9 +8614,9 @@
       }
     },
     "mixin-deep": {
-      "version": "1.3.1",
-      "resolved": "https://registry.npmjs.org/mixin-deep/-/mixin-deep-1.3.1.tgz",
-      "integrity": "sha512-8ZItLHeEgaqEvd5lYBXfm4EZSFCX29Jb9K+lAHhDKzReKBQKj3R+7NOF6tjqYi9t4oI8VUfaWITJQm86wnXGNQ==",
+      "version": "1.3.2",
+      "resolved": "https://registry.npmjs.org/mixin-deep/-/mixin-deep-1.3.2.tgz",
+      "integrity": "sha512-WRoDn//mXBiJ1H40rqa3vH0toePwSsGb45iInWlTySa+Uu4k3tYUSxa2v1KqAiLtvlrSzaExqS1gtk96A9zvEA==",
       "dev": true,
       "requires": {
         "for-in": "^1.0.2",

package.json

@@ -41,6 +41,7 @@
     "body-parser": "^1.18.3",
     "connect-multiparty": "^2.2.0",
     "cookie-session": "^2.0.0-beta.3",
+    "cors": "^2.8.5",
     "express": "^4.16.4",
     "express-handlebars": "^3.0.0",
     "express-http-context": "^1.2.0",

server/index.js

@@ -3,6 +3,7 @@ const express = require('express');
 const bodyParser = require('body-parser');
 const expressHandlebars = require('express-handlebars');
 const helmet = require('helmet');
+const cors = require('cors');
 const cookieSession = require('cookie-session');
 const http = require('http');
 const logger = require('winston');
@@ -23,7 +24,7 @@ const processTrending = require('./utils/processTrending');
 const { setRouteDataInContextMiddleware } = require('./middleware/httpContextMiddleware');
 
 const {
-  details: { port: PORT, blockListEndpoint },
+  details: { port: PORT, blockListEndpoint, corsWhitelist, host },
   startup: { performChecks, performUpdates },
 } = require('@config/siteConfig');
 
@@ -82,7 +83,37 @@ function Server() {
 
     // set HTTP headers to protect against well-known web vulnerabilties
     app.use(helmet());
+    // open cors for site/config:host (current instance)
+    var originWhitelist = [
+      host
+    ];
+    // whitelist is found in site/config:details:
+    // enter corsWhitelist: ["*"] to allow all
+    // enter your domains otherwise:["https://example.com", ...]
+    if ( corsWhitelist && corsWhitelist.length ) {
+      originWhitelist = originWhitelist.concat(corsWhitelist);
+    }
 
+    var corsOptions = originWhitelist && originWhitelist.includes('*')
+    ? {
+      "origin": "*",
+      "methods": "GET,HEAD,PUT,PATCH,POST,DELETE",
+      "preflightContinue": false,
+      "optionsSuccessStatus": 204
+    }
+    : {
+      origin: function(origin, callback) {
+        if ((origin === undefined) || originWhitelist.indexOf(origin) !== -1) {
+          callback(null, true);
+        } else {
+          let error = new Error(`CORS has blocked this website from access. Contact an administrator from ${host} if you feel this is in error.`);
+          error.code = "ECORS"
+          callback(error);
+        }
+      },
+    };
+
+    app.use(cors(corsOptions));
     // Support per-request http-context
     app.use(httpContext.middleware);
 
@@ -148,6 +179,16 @@ function Server() {
       );
     });
 
+    app.use( (error, req, res, next) => {
+      if (error.code === 'ECORS'){
+        res.status(403);
+        res.send({message: error})
+      } else {
+        res.status(520);
+        res.send({ message: error });
+      }
+    })
+
     this.app = app;
   };
   this.createServer = () => {