Refactor DM enabled checking to make it re-usable

functions/handlers/users.js

@@ -518,21 +518,19 @@ exports.getDirectMessages = (req, res) => {
     });
 }
 
-// Sends a DM from the caller to the requested DM document
-exports.sendDirectMessage = (req, res) => {
-  return res.status(200).json({message: "Not implemented yet"})
+// Returns a promise that resolves if user has DMs enabled
+// and rejects if there is an error or DMs are disabled
+isDirectMessageEnabled = (username) => {
+  return new Promise((resolve, reject) => {
+    let result = {};
+    result.code = null;
+    result.message = null;
+    if (username === null || username === undefined || username === "") {
+      result.code = 400;
+      result.message = "No user was sent in the request. The request should have a non-empty 'user' key.";
+      reject(result);
     }
 
-// Creates a DM between the caller and the user in the request
-exports.createDirectMessage = (req, res) => {
-  return res.status(200).json({message: "Not implemented yet"})
-}
-
-// Checks if the requested user has DMs enable or not
-exports.checkDirectMessagesEnabled = (req, res) => {
-  username = req.body.user;
-  if (username === null || username === undefined) return res.status(400).json({error: "No user was sent in the request. The request should have a 'user' key."});
-
     db.doc(`/users/${username}`)
       .get()
       .then((doc) => {
@@ -540,18 +538,62 @@ exports.checkDirectMessagesEnabled = (req, res) => {
           console.log(doc.data())
           if (doc.data().dmEnabled === true || doc.data().dmEnabled === null || doc.data().dmEnabled === undefined) {
             // Assume DMs are enabled if they don't have a dmEnabled key
-          return res.status(200).json({enabled: true});
+            resolve(result);
           } else {
-          return res.status(200).json({enabled: false});
+            result.code = 0;
+            reject(result);
           }
         } else {
           console.log(`${username} is not in the database`);
-        return res.status(400).json({error: `${username} is not in the database`});
+          result.code = 400;
+          result.message = `${username} is not in the database`;
+          reject(result);
         }
       })
       .catch((err) => {
+        console.log("HI")
         console.error(err);
-      return res.status(500).json({error: err});
+        result.code = 500;
+        result.message = err;
+        reject(result);
+      })
+    });
+}
+
+
+// Sends a DM from the caller to the requested DM document
+exports.sendDirectMessage = (req, res) => {
+  return res.status(200).json({message: "Not implemented yet"})
+}
+
+// Creates a DM between the caller and the user in the request
+exports.createDirectMessage = (req, res) => {
+  // TODO: Check if the user exists
+  // TODO: Check if this user has dms enabled
+  // TODO: Check if they have dms enabled
+  // TODO: Check if there is already a dm
+
+  // this.checkDirectMessagesEnabled(req, res);
+}
+
+// Checks if the requested user has DMs enable or not
+/* Request Parameters
+ * user: str
+ */
+exports.checkDirectMessagesEnabled = (req, res) => {
+  isDirectMessageEnabled(req.body.user)
+    .then(() => {
+      return res.status(200).json({enabled: true});
+    })
+    .catch((result) => {
+      console.log(result);
+      if (result.code === 0) {
+        // DMs are disabled
+        return res.status(200).json({enabled: false});
+      } else {
+        // Some other error occured
+        return res.status(result.code).json({err: result.message});
+      }
     })
 }