obscure private device provenance

Allow users to choose whether or not to reveal the provenance of the data to
consumers.  This is intended to help protect data rights to portability and
access.  If consumers start abusing or discriminating against Nightscout users
due to the source of the data, this allows users to conceal this information.

lib/api/entries/index.js

@@ -355,7 +355,7 @@ function configure (app, wares, ctx, env) {
       res.entries_err = err;
       return next();
     });
-  }, format_entries);
+  }, wares.obscure_device, format_entries);
 
   /**
    * @module get#/entries/:spec
@@ -389,7 +389,7 @@ function configure (app, wares, ctx, env) {
       prepReqModel(req, req.params.model);
       query_models(req, res, next);
     }
-  }, format_entries);
+  }, wares.obscure_device, format_entries);
 
   /**
    * @module get#/entries
@@ -400,7 +400,7 @@ function configure (app, wares, ctx, env) {
    * `find[date]`.
    *
    */
-  api.get('/entries', ifModifiedSinceCTX, query_models, format_entries);
+  api.get('/entries', ifModifiedSinceCTX, query_models, wares.obscure_device, format_entries);
 
   /**
    * @function echo_query
@@ -738,7 +738,7 @@ function configure (app, wares, ctx, env) {
         * @routed
         * @response 200 /definitions/Entries
         */
-  api.get('/times/:prefix?/:regex?', prep_storage, prep_pattern_field, prep_patterns, prep_patterns, query_models, format_entries);
+  api.get('/times/:prefix?/:regex?', prep_storage, prep_pattern_field, prep_patterns, prep_patterns, query_models, wares.obscure_device, format_entries);
 
   api.get('/count/:storage/where', prep_storage, count_records, format_results);
 
@@ -753,7 +753,7 @@ function configure (app, wares, ctx, env) {
   /api/v1/slice/entries/dateString/mbg/2015.json
   ```
         */
-  api.get('/slice/:storage/:field/:type?/:prefix?/:regex?', prep_storage, prep_pattern_field, prep_patterns, query_models, format_entries);
+  api.get('/slice/:storage/:field/:type?/:prefix?/:regex?', prep_storage, prep_pattern_field, prep_patterns, query_models, wares.obscure_device, format_entries);
 
   /**
    * @module post#/entries/preview
@@ -765,7 +765,7 @@ function configure (app, wares, ctx, env) {
     // setting this flag tells insert_entries to not actually store the results
     req.persist_entries = false;
     next();
-  }, insert_entries, format_entries);
+  }, insert_entries, wares.obscure_device, format_entries);
 
   // Protect endpoints with authenticated api.
   if (app.enabled('api')) {
@@ -780,7 +780,7 @@ function configure (app, wares, ctx, env) {
       // setting this flag tells insert_entries to store the results
       req.persist_entries = true;
       next();
-    }, insert_entries, format_entries);
+    }, insert_entries, wares.obscure_device, format_entries);
 
     /**
      * @module delete#/entries/:spec

lib/middleware/index.js

@@ -3,7 +3,8 @@
 var wares = {
   sendJSONStatus : require('./send-json-status'),
   bodyParser : require('body-parser'),
-  compression : require('compression')
+  compression : require('compression'),
+  obscureDeviceProvenance: require('./obscure-provenance')
 };
 
 function extensions (list) {
@@ -26,7 +27,8 @@ function configure (env) {
       limit: '1Mb'
     }),
     compression: wares.compression,
-    extensions: extensions
+    extensions: extensions,
+    obscure_device: wares.obscureDeviceProvenance(env)
   };
 }
 

lib/middleware/obscure-provenance.js

@@ -0,0 +1,12 @@
+
+module.exports = function create_device_obscurity (env) {
+  function obscure_device (req, res, next) {
+    if (res.entries && env.settings.obscureDeviceProvenance) {
+      for (var i = 0; i < res.entries.length; i++) {
+        res.entries[i].device = env.settings.obscureDeviceProvenance;
+      }
+    }
+    next( );
+  }
+  return obscure_device;
+}

lib/settings.js

@@ -70,6 +70,8 @@ function init () {
     , frameName8: ''
     , authFailDelay: 5000
     , adminNotifiesEnabled: true
+    , obscured: ''
+    , obscureDeviceProvenance: ''
   };
 
   var secureSettings = [
@@ -78,6 +80,8 @@ function init () {
     , 'developerTeamId'
     , 'userName'
     , 'password'
+    , 'obscured'
+    , 'obscureDeviceProvenance'
   ];
 
   var valueMappers = {
@@ -129,6 +133,9 @@ function init () {
 
   function filteredSettings(settingsObject) {
     let so = _.cloneDeep(settingsObject);
+    if (so.obscured) {
+      so.enable = _.difference(so.enable, so.obscured);
+    }
     return filterObj(so, secureSettings);
   }
 
@@ -244,6 +251,7 @@ function init () {
 
     var enable = getAndPrepare('enable');
     var disable = getAndPrepare('disable');
+    var obscured = getAndPrepare('obscured');
 
     settings.alarmTypes = prepareAlarmTypes();
 
@@ -266,6 +274,7 @@ function init () {
 
     //all enabled feature, without any that have been disabled
     settings.enable = _.difference(enable, disable);
+    settings.obscured = obscured;
 
     var thresholds = settings.thresholds;