Added getUserInfo endpoint

This endpoint provides the following data about the user:

* userID
* userName
* minutesSaved
* segmentCount
* viewCount

src/routes/getUserInfo.js

@@ -0,0 +1,71 @@
+const db = require('../databases/databases.js').db;
+const getHash = require('../utils/getHash.js');
+
+function dbGetSubmittedSegmentSummary (userID) {
+  try {
+    let row = db.prepare("get", "SELECT SUM(((endTime - startTime) / 60) * views) as minutesSaved, count(*) as segmentCount FROM sponsorTimes WHERE userID = ? AND votes > -2 AND shadowHidden != 1", [userID]);
+    if (row.minutesSaved != null) {
+      return {
+        minutesSaved: row.minutesSaved,
+        segmentCount: row.segmentCount,
+      };
+    } else {
+      return {
+        minutesSaved: 0,
+        segmentCount: 0,
+      };
+    }
+  } catch (err) {
+    return false;
+  }
+}
+
+function dbGetUsername (userID) {
+  try {
+    let row = db.prepare('get', "SELECT userName FROM userNames WHERE userID = ?", [userID]);
+    if (row !== undefined) {
+      return row.userName;
+    } else {
+      //no username yet, just send back the userID
+      return userID;
+    }
+  } catch (err) {
+    return false;
+  }
+}
+
+function dbGetViewsForUser (userID) {
+  try {
+    let row = db.prepare('get', "SELECT SUM(views) as viewCount FROM sponsorTimes WHERE userID = ? AND votes > -2 AND shadowHidden != 1", [userID]);
+    //increase the view count by one
+    if (row.viewCount != null) {
+      return row.viewCount;
+    } else {
+      return 0;
+    }
+  } catch (err) {
+    return false;
+  }
+}
+
+module.exports = function getUserInfo (req, res) {
+  let userID = req.query.userID;
+
+  if (userID == undefined) {
+    //invalid request
+    res.status(400).send('Parameters are not valid');
+    return;
+  }
+
+  //hash the userID
+  userID = getHash(userID);
+  
+  const segmentsSummary = dbGetSubmittedSegmentSummary(userID);
+  res.send({
+    userID,
+    userName: dbGetUsername(userID),
+    minutesSaved: segmentsSummary.minutesSaved,
+    segmentCount: segmentsSummary.segmentCount,
+    viewCount: dbGetViewsForUser(userID),
+  });
+}