Deprecate API v2 (#7761)

* deprecate api-v2

* remove v2 test helpers

* remove unused string

website/server/libs/preening.js

@@ -0,0 +1,82 @@
+import _ from 'lodash';
+import moment from 'moment';
+
+// Aggregate entries
+function _aggregate (history, aggregateBy) {
+  return _.chain(history)
+    .groupBy(entry => { // group entries by aggregateBy
+      return moment(entry.date).format(aggregateBy);
+    })
+    .sortBy((entry, key) => key) // sort by date
+    .map(entries => {
+      return {
+        date: Number(entries[0].date),
+        value: _.reduce(entries, (previousValue, entry) => {
+          return previousValue + entry.value;
+        }, 0) / entries.length,
+      };
+    })
+    .value();
+}
+
+/* Preen an array of history entries
+Free users:
+- 1 value for each day of the past 60 days (no compression)
+- 1 value each month for the previous 10 months
+- 1 value each year for the previous years
+Subscribers and challenges:
+- 1 value for each day of the past 365 days (no compression)
+- 1 value each month for the previous 12 months
+- 1 value each year for the previous years
+ */
+export function preenHistory (history, isSubscribed, timezoneOffset) {
+  // history = _.filter(history, historyEntry => Boolean(historyEntry)); // Filter missing entries
+  let now = timezoneOffset ? moment().zone(timezoneOffset) : moment();
+  // Date after which to begin compressing data
+  let cutOff = now.subtract(isSubscribed ? 365 : 60, 'days').startOf('day');
+
+  // Keep uncompressed entries (modifies history and returns removed items)
+  let newHistory = _.remove(history, entry => {
+    let date = moment(entry.date);
+    return date.isSame(cutOff) || date.isAfter(cutOff);
+  });
+
+  // Date after which to begin compressing data by year
+  let monthsCutOff = cutOff.subtract(isSubscribed ? 12 : 10, 'months').startOf('day');
+  let aggregateByMonth = _.remove(history, entry => {
+    let date = moment(entry.date);
+    return date.isSame(monthsCutOff) || date.isAfter(monthsCutOff);
+  });
+  // Aggregate remaining entries by month and year
+  if (aggregateByMonth.length > 0) newHistory.unshift(..._aggregate(aggregateByMonth, 'YYYYMM'));
+  if (history.length > 0) newHistory.unshift(..._aggregate(history, 'YYYY'));
+
+  return newHistory;
+}
+
+// Preen history for users and tasks.
+export function preenUserHistory (user, tasksByType) {
+  let isSubscribed = user.isSubscribed();
+  let timezoneOffset = user.preferences.timezoneOffset;
+  let minHistoryLength = isSubscribed ? 365 : 60;
+
+  function _processTask (task) {
+    if (task.history && task.history.length > minHistoryLength) {
+      task.history = preenHistory(task.history, isSubscribed, timezoneOffset);
+      task.markModified('history');
+    }
+  }
+
+  tasksByType.habits.forEach(_processTask);
+  tasksByType.dailys.forEach(_processTask);
+
+  if (user.history.exp.length > minHistoryLength) {
+    user.history.exp = preenHistory(user.history.exp, isSubscribed, timezoneOffset);
+    user.markModified('history.exp');
+  }
+
+  if (user.history.todos.length > minHistoryLength) {
+    user.history.todos = preenHistory(user.history.todos, isSubscribed, timezoneOffset);
+    user.markModified('history.todos');
+  }
+}