GET liked status

app/src/building.js

@@ -83,6 +83,16 @@ function getBuildingById(id) {
     });
 }
 
+function getBuildingLikeById(building_id, user_id) {
+    return db.one(
+        "SELECT true as like FROM building_user_likes WHERE building_id = $1 and user_id = $2 LIMIT 1",
+        [building_id, user_id]
+    ).catch(function(error){
+        console.error(error);
+        return undefined;
+    });
+}
+
 function getBuildingUPRNsById(id) {
     return db.any(
         "SELECT uprn, parent_uprn FROM building_properties WHERE building_id = $1",
@@ -278,5 +288,12 @@ function compare(old_obj, new_obj, whitelist){
     return [forward_patch, reverse_patch]
 }
 
-export { queryBuildingsAtPoint, queryBuildingsByReference, getBuildingById,
-         getBuildingUPRNsById, saveBuilding, likeBuilding };
+export {
+    queryBuildingsAtPoint,
+    queryBuildingsByReference,
+    getBuildingById,
+    getBuildingLikeById,
+    getBuildingUPRNsById,
+    saveBuilding,
+    likeBuilding
+};

app/src/server.js

@@ -17,8 +17,15 @@ import pgConnect from 'connect-pg-simple';
 import App from './frontend/app';
 import db from './db';
 import { authUser, createUser, getUserById, authAPIUser, getNewUserAPIKey } from './user';
-import { queryBuildingsAtPoint, queryBuildingsByReference, getBuildingById,
-         getBuildingUPRNsById, saveBuilding, likeBuilding } from './building';
+import {
+    queryBuildingsAtPoint,
+    queryBuildingsByReference,
+    getBuildingById,
+    getBuildingLikeById,
+    getBuildingUPRNsById,
+    saveBuilding,
+    likeBuilding
+} from './building';
 import tileserver from './tileserver';
 import { parseBuildingURL } from './parse';
 
@@ -238,27 +245,45 @@ server.get('/building/:building_id/uprns.json', function (req, res) {
         })
     })
 
-// POST like building
-server.post('/building/like/:building_id', function(req, res){
-    if (!req.session.user_id) {
-        res.send({error: 'Must be logged in'});
-        return
-    }
-    const { building_id } = req.params;
-    likeBuilding(building_id, req.session.user_id).then(building => {
-        if (building.error) {
+// GET/POST like building
+server.route('/building/:building_id/like.json')
+    .get(function(req, res){
+        if (!req.session.user_id) {
+            res.send({like: false});  // not logged in, so cannot have liked
+            return
+        }
+        const { building_id } = req.params;
+        getBuildingLikeById(building_id, req.session.user_id).then(like => {
+            if (typeof(like) === "undefined") {
+                res.send({like: false})
+                return
+            }
+            // any value returned means like
+            res.send({like: true})
+        }).catch(
+            () => res.send({error:'Database error'})
+        )
+    })
+    .post(function(req, res){
+        if (!req.session.user_id) {
+            res.send({error: 'Must be logged in'});
+            return
+        }
+        const { building_id } = req.params;
+        likeBuilding(building_id, req.session.user_id).then(building => {
+            if (building.error) {
+                res.send(building)
+                return
+            }
+            if (typeof(building) === "undefined") {
+                res.send({error:'Database error'})
+                return
+            }
             res.send(building)
-            return
-        }
-        if (typeof(building) === "undefined") {
-            res.send({error:'Database error'})
-            return
-        }
-        res.send(building)
-    }).catch(
-        () => res.send({error:'Database error'})
-    )
-});
+        }).catch(
+            () => res.send({error:'Database error'})
+        )
+    })
 
 // POST new user
 server.post('/users', function(req, res){