Introduce an Events API

* Meld the following disparate endpoints:
 * `/projects/:id/events`
 * `/events`
 * `/users/:id/events`
+ Add result filtering to the above endpoints:
 * action
 * target_type
 * before and after dates

15 files changed, 712 insertions, 443 deletions

diff --git a/app/finders/events_finder.rb b/app/finders/events_finder.rb
new file mode 100644
index 00000000000..b0450ddc1fd
--- /dev/null
+++ b/app/finders/events_finder.rb
@@ -0,0 +1,62 @@
+class EventsFinder
+  attr_reader :source, :params, :current_user
+
+  # Used to filter Events
+  #
+  # Arguments:
+  #   source - which user or project to looks for events on
+  #   current_user - only return events for projects visible to this user
+  #   params:
+  #     action: string
+  #     target_type: string
+  #     before: datetime
+  #     after: datetime
+  #
+  def initialize(params = {})
+    @source = params.delete(:source)
+    @current_user = params.delete(:current_user)
+    @params = params
+  end
+
+  def execute
+    events = source.events
+
+    events = by_current_user_access(events)
+    events = by_action(events)
+    events = by_target_type(events)
+    events = by_created_at_before(events)
+    events = by_created_at_after(events)
+
+    events
+  end
+
+  private
+
+  def by_current_user_access(events)
+    events.merge(ProjectsFinder.new(current_user: current_user).execute).references(:project)
+  end
+
+  def by_action(events)
+    return events unless Event::ACTIONS[params[:action]]
+
+    events.where(action: Event::ACTIONS[params[:action]])
+  end
+
+  def by_target_type(events)
+    return events unless Event::TARGET_TYPES[params[:target_type]]
+
+    events.where(target_type: Event::TARGET_TYPES[params[:target_type]])
+  end
+
+  def by_created_at_before(events)
+    return events unless params[:before]
+
+    events.where('events.created_at < ?', params[:before].beginning_of_day)
+  end
+
+  def by_created_at_after(events)
+    return events unless params[:after]
+
+    events.where('events.created_at > ?', params[:after].end_of_day)
+  end
+end
diff --git a/app/models/event.rb b/app/models/event.rb
index 46e89388bc1..d6d39473774 100644
--- a/app/models/event.rb
+++ b/app/models/event.rb
@@ -14,6 +14,30 @@ class Event < ActiveRecord::Base
   DESTROYED = 10
   EXPIRED   = 11 # User left project due to expiry
 
+  ACTIONS = HashWithIndifferentAccess.new(
+    created:    CREATED,
+    updated:    UPDATED,
+    closed:     CLOSED,
+    reopened:   REOPENED,
+    pushed:     PUSHED,
+    commented:  COMMENTED,
+    merged:     MERGED,
+    joined:     JOINED,
+    left:       LEFT,
+    destroyed:  DESTROYED,
+    expired:    EXPIRED
+  ).freeze
+
+  TARGET_TYPES = HashWithIndifferentAccess.new(
+    issue:          Issue,
+    milestone:      Milestone,
+    merge_request:  MergeRequest,
+    note:           Note,
+    project:        Project,
+    snippet:        Snippet,
+    user:           User
+  ).freeze
+
   RESET_PROJECT_ACTIVITY_INTERVAL = 1.hour
 
   delegate :name, :email, :public_email, :username, to: :author, prefix: true, allow_nil: true
@@ -55,6 +79,14 @@ class Event < ActiveRecord::Base
     def limit_recent(limit = 20, offset = nil)
       recent.limit(limit).offset(offset)
     end
+
+    def actions
+      ACTIONS.keys
+    end
+
+    def target_types
+      TARGET_TYPES.keys
+    end
   end
 
   def visible_to_user?(user = nil)
diff --git a/changelogs/unreleased/14707-allow-activity-feed-to-be-accessible-through-api.yml b/changelogs/unreleased/14707-allow-activity-feed-to-be-accessible-through-api.yml
new file mode 100644
index 00000000000..9c17c3b949c
--- /dev/null
+++ b/changelogs/unreleased/14707-allow-activity-feed-to-be-accessible-through-api.yml
@@ -0,0 +1,4 @@
+---
+title: Introduce an Events API
+merge_request: 11755
+author:
diff --git a/doc/api/README.md b/doc/api/README.md
index 44e345b1cf6..e1d4009dedc 100644
--- a/doc/api/README.md
+++ b/doc/api/README.md
@@ -16,6 +16,7 @@ following locations:
 - [Deployments](deployments.md)
 - [Deploy Keys](deploy_keys.md)
 - [Environments](environments.md)
+- [Events](events.md)
 - [Gitignores templates](templates/gitignores.md)
 - [GitLab CI Config templates](templates/gitlab_ci_ymls.md)
 - [Groups](groups.md)
diff --git a/doc/api/events.md b/doc/api/events.md
new file mode 100644
index 00000000000..ef57287264d
--- /dev/null
+++ b/doc/api/events.md
@@ -0,0 +1,347 @@
+# Events
+
+## Filter parameters
+
+### Action Types
+
+Available action types for the `action` parameter are:
+
+- `created`
+- `updated`
+- `closed`
+- `reopened`
+- `pushed`
+- `commented`
+- `merged`
+- `joined`
+- `left`
+- `destroyed`
+- `expired`
+
+Note that these options are downcased.
+
+### Target Types
+
+Available target types for the `target_type` parameter are:
+
+- `issue`
+- `milestone`
+- `merge_request`
+- `note`
+- `project`
+- `snippet`
+- `user`
+
+Note that these options are downcased.
+
+### Date formatting
+
+Dates for the `before` and `after` parameters should be supplied in the following format:
+
+```
+YYYY-MM-DD
+```
+
+## List currently authenticated user's events
+
+>**Note:** This endpoint was introduced in GitLab 9.3.
+
+Get a list of events for the authenticated user.
+
+```
+GET /events
+```
+
+Parameters:
+
+| Attribute | Type | Required | Description |
+| --------- | ---- | -------- | ----------- |
+| `action` | string | no | Include only events of a particular [action type][action-types] |
+| `target_type` | string | no | Include only events of a particular [target type][target-types] |
+| `before` | date | no |  Include only events created before a particular date. Please see [here for the supported format][date-formatting] |
+| `after` | date | no |  Include only events created after a particular date. Please see [here for the supported format][date-formatting]  |
+| `sort` | string | no | Sort events in `asc` or `desc` order by `created_at`. Default is `desc` |
+
+Example request:
+
+```
+curl --header "PRIVATE-TOKEN 9koXpg98eAheJpvBs5tK" https://gitlab.example.com/api/v4/events&target_type=issue&action=created&after=2017-01-31&before=2017-03-01
+```
+
+Example response:
+
+```json
+[
+  {
+    "title":null,
+    "project_id":1,
+    "action_name":"opened",
+    "target_id":160,
+    "target_type":"Issue",
+    "author_id":25,
+    "data":null,
+    "target_title":"Qui natus eos odio tempore et quaerat consequuntur ducimus cupiditate quis.",
+    "created_at":"2017-02-09T10:43:19.667Z",
+    "author":{
+      "name":"User 3",
+      "username":"user3",
+      "id":25,
+      "state":"active",
+      "avatar_url":"http://www.gravatar.com/avatar/97d6d9441ff85fdc730e02a6068d267b?s=80\u0026d=identicon",
+      "web_url":"https://gitlab.example.com/user3"
+    },
+    "author_username":"user3"
+  },
+  {
+    "title":null,
+    "project_id":1,
+    "action_name":"opened",
+    "target_id":159,
+    "target_type":"Issue",
+    "author_id":21,
+    "data":null,
+    "target_title":"Nostrum enim non et sed optio illo deleniti non.",
+    "created_at":"2017-02-09T10:43:19.426Z",
+    "author":{
+      "name":"Test User",
+      "username":"ted",
+      "id":21,
+      "state":"active",
+      "avatar_url":"http://www.gravatar.com/avatar/80fb888c9a48b9a3f87477214acaa63f?s=80\u0026d=identicon",
+      "web_url":"https://gitlab.example.com/ted"
+    },
+    "author_username":"ted"
+  }
+]
+```
+
+### Get user contribution events
+
+>**Note:** Documentation was formerly located in the [Users API pages][users-api].
+
+Get the contribution events for the specified user, sorted from newest to oldest.
+
+```
+GET /users/:id/events
+```
+
+Parameters:
+
+| Attribute | Type | Required | Description |
+| --------- | ---- | -------- | ----------- |
+| `id` | integer | yes | The ID of the user |
+| `action` | string | no | Include only events of a particular [action type][action-types] |
+| `target_type` | string | no | Include only events of a particular [target type][target-types] |
+| `before` | date | no |  Include only events created before a particular date. Please see [here for the supported format][date-formatting] |
+| `after` | date | no |  Include only events created after a particular date. Please see [here for the supported format][date-formatting]  |
+| `sort` | string | no | Sort events in `asc` or `desc` order by `created_at`. Default is `desc` |
+
+```bash
+curl --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" https://gitlab.example.com/api/v4/users/:id/events
+```
+
+Example response:
+
+```json
+[
+  {
+    "title": null,
+    "project_id": 15,
+    "action_name": "closed",
+    "target_id": 830,
+    "target_type": "Issue",
+    "author_id": 1,
+    "data": null,
+    "target_title": "Public project search field",
+    "author": {
+      "name": "Dmitriy Zaporozhets",
+      "username": "root",
+      "id": 1,
+      "state": "active",
+      "avatar_url": "http://localhost:3000/uploads/user/avatar/1/fox_avatar.png",
+      "web_url": "http://localhost:3000/root"
+    },
+    "author_username": "root"
+  },
+  {
+    "title": null,
+    "project_id": 15,
+    "action_name": "opened",
+    "target_id": null,
+    "target_type": null,
+    "author_id": 1,
+    "author": {
+      "name": "Dmitriy Zaporozhets",
+      "username": "root",
+      "id": 1,
+      "state": "active",
+      "avatar_url": "http://localhost:3000/uploads/user/avatar/1/fox_avatar.png",
+      "web_url": "http://localhost:3000/root"
+    },
+    "author_username": "john",
+    "data": {
+      "before": "50d4420237a9de7be1304607147aec22e4a14af7",
+      "after": "c5feabde2d8cd023215af4d2ceeb7a64839fc428",
+      "ref": "refs/heads/master",
+      "user_id": 1,
+      "user_name": "Dmitriy Zaporozhets",
+      "repository": {
+        "name": "gitlabhq",
+        "url": "git@dev.gitlab.org:gitlab/gitlabhq.git",
+        "description": "GitLab: self hosted Git management software. \r\nDistributed under the MIT License.",
+        "homepage": "https://dev.gitlab.org/gitlab/gitlabhq"
+      },
+      "commits": [
+        {
+          "id": "c5feabde2d8cd023215af4d2ceeb7a64839fc428",
+          "message": "Add simple search to projects in public area",
+          "timestamp": "2013-05-13T18:18:08+00:00",
+          "url": "https://dev.gitlab.org/gitlab/gitlabhq/commit/c5feabde2d8cd023215af4d2ceeb7a64839fc428",
+          "author": {
+            "name": "Dmitriy Zaporozhets",
+            "email": "dmitriy.zaporozhets@gmail.com"
+          }
+        }
+      ],
+      "total_commits_count": 1
+    },
+    "target_title": null
+  },
+  {
+    "title": null,
+    "project_id": 15,
+    "action_name": "closed",
+    "target_id": 840,
+    "target_type": "Issue",
+    "author_id": 1,
+    "data": null,
+    "target_title": "Finish & merge Code search PR",
+    "author": {
+      "name": "Dmitriy Zaporozhets",
+      "username": "root",
+      "id": 1,
+      "state": "active",
+      "avatar_url": "http://localhost:3000/uploads/user/avatar/1/fox_avatar.png",
+      "web_url": "http://localhost:3000/root"
+    },
+    "author_username": "root"
+  },
+  {
+    "title": null,
+    "project_id": 15,
+    "action_name": "commented on",
+    "target_id": 1312,
+    "target_type": "Note",
+    "author_id": 1,
+    "data": null,
+    "target_title": null,
+    "created_at": "2015-12-04T10:33:58.089Z",
+    "note": {
+      "id": 1312,
+      "body": "What an awesome day!",
+      "attachment": null,
+      "author": {
+        "name": "Dmitriy Zaporozhets",
+        "username": "root",
+        "id": 1,
+        "state": "active",
+        "avatar_url": "http://localhost:3000/uploads/user/avatar/1/fox_avatar.png",
+        "web_url": "http://localhost:3000/root"
+      },
+      "created_at": "2015-12-04T10:33:56.698Z",
+      "system": false,
+      "noteable_id": 377,
+      "noteable_type": "Issue"
+    },
+    "author": {
+      "name": "Dmitriy Zaporozhets",
+      "username": "root",
+      "id": 1,
+      "state": "active",
+      "avatar_url": "http://localhost:3000/uploads/user/avatar/1/fox_avatar.png",
+      "web_url": "http://localhost:3000/root"
+    },
+    "author_username": "root"
+  }
+]
+```
+
+## List a Project's visible events
+
+>**Note:** This endpoint has been around longer than the others. Documentation was formerly located in the [Projects API pages][projects-api].
+
+Get a list of visible events for a particular project.
+
+```
+GET /:project_id/events
+```
+
+Parameters:
+
+| Attribute | Type | Required | Description |
+| --------- | ---- | -------- | ----------- |
+| `project_id` | integer/string | yes | The ID or [URL-encoded path of the project](README.md#namespaced-path-encoding) |
+| `action` | string | no | Include only events of a particular [action type][action-types] |
+| `target_type` | string | no | Include only events of a particular [target type][target-types] |
+| `before` | date | no |  Include only events created before a particular date. Please see [here for the supported format][date-formatting] |
+| `after` | date | no |  Include only events created after a particular date. Please see [here for the supported format][date-formatting]  |
+| `sort` | string | no | Sort events in `asc` or `desc` order by `created_at`. Default is `desc` |
+
+Example request:
+
+```
+curl --header "PRIVATE-TOKEN 9koXpg98eAheJpvBs5tK" https://gitlab.example.com/api/v4/projects/:project_id/events&target_type=issue&action=created&after=2017-01-31&before=2017-03-01
+```
+
+Example response:
+
+```json
+[
+  {
+    "title":null,
+    "project_id":1,
+    "action_name":"opened",
+    "target_id":160,
+    "target_type":"Issue",
+    "author_id":25,
+    "data":null,
+    "target_title":"Qui natus eos odio tempore et quaerat consequuntur ducimus cupiditate quis.",
+    "created_at":"2017-02-09T10:43:19.667Z",
+    "author":{
+      "name":"User 3",
+      "username":"user3",
+      "id":25,
+      "state":"active",
+      "avatar_url":"http://www.gravatar.com/avatar/97d6d9441ff85fdc730e02a6068d267b?s=80\u0026d=identicon",
+      "web_url":"https://gitlab.example.com/user3"
+    },
+    "author_username":"user3"
+  },
+  {
+    "title":null,
+    "project_id":1,
+    "action_name":"opened",
+    "target_id":159,
+    "target_type":"Issue",
+    "author_id":21,
+    "data":null,
+    "target_title":"Nostrum enim non et sed optio illo deleniti non.",
+    "created_at":"2017-02-09T10:43:19.426Z",
+    "author":{
+      "name":"Test User",
+      "username":"ted",
+      "id":21,
+      "state":"active",
+      "avatar_url":"http://www.gravatar.com/avatar/80fb888c9a48b9a3f87477214acaa63f?s=80\u0026d=identicon",
+      "web_url":"https://gitlab.example.com/ted"
+    },
+    "author_username":"ted"
+  }
+]
+```
+
+[target-types]: #target-types "Target Type parameter"
+[action-types]: #action-types "Action Type parameter"
+[date-formatting]: #date-formatting "Date Formatting guidance"
+[projects-api]: projects.md "Projects API pages"
+[users-api]: users.md "Users API pages"
diff --git a/doc/api/projects.md b/doc/api/projects.md
index 70cad8a6025..0debdcfae89 100644
--- a/doc/api/projects.md
+++ b/doc/api/projects.md
@@ -310,143 +310,7 @@ GET /projects/:id/users
 
 ### Get project events
 
-Get the events for the specified project sorted from newest to oldest. This
-endpoint can be accessed without authentication if the project is publicly
-accessible.
-
-```
-GET /projects/:id/events
-```
-
-Parameters:
-
-| Attribute | Type | Required | Description |
-| --------- | ---- | -------- | ----------- |
-| `id` | integer/string | yes | The ID or [URL-encoded path of the project](README.md#namespaced-path-encoding) |
-
-```json
-[
-  {
-    "title": null,
-    "project_id": 15,
-    "action_name": "closed",
-    "target_id": 830,
-    "target_type": "Issue",
-    "author_id": 1,
-    "data": null,
-    "target_title": "Public project search field",
-    "author": {
-      "name": "Dmitriy Zaporozhets",
-      "username": "root",
-      "id": 1,
-      "state": "active",
-      "avatar_url": "http://localhost:3000/uploads/user/avatar/1/fox_avatar.png",
-      "web_url": "http://localhost:3000/root"
-    },
-    "author_username": "root"
-  },
-  {
-    "title": null,
-    "project_id": 15,
-    "action_name": "opened",
-    "target_id": null,
-    "target_type": null,
-    "author_id": 1,
-    "author": {
-      "name": "Dmitriy Zaporozhets",
-      "username": "root",
-      "id": 1,
-      "state": "active",
-      "avatar_url": "http://localhost:3000/uploads/user/avatar/1/fox_avatar.png",
-      "web_url": "http://localhost:3000/root"
-    },
-    "author_username": "john",
-    "data": {
-      "before": "50d4420237a9de7be1304607147aec22e4a14af7",
-      "after": "c5feabde2d8cd023215af4d2ceeb7a64839fc428",
-      "ref": "refs/heads/master",
-      "user_id": 1,
-      "user_name": "Dmitriy Zaporozhets",
-      "repository": {
-        "name": "gitlabhq",
-        "url": "git@dev.gitlab.org:gitlab/gitlabhq.git",
-        "description": "GitLab: self hosted Git management software. \r\nDistributed under the MIT License.",
-        "homepage": "https://dev.gitlab.org/gitlab/gitlabhq"
-      },
-      "commits": [
-        {
-          "id": "c5feabde2d8cd023215af4d2ceeb7a64839fc428",
-          "message": "Add simple search to projects in public area",
-          "timestamp": "2013-05-13T18:18:08+00:00",
-          "url": "https://dev.gitlab.org/gitlab/gitlabhq/commit/c5feabde2d8cd023215af4d2ceeb7a64839fc428",
-          "author": {
-            "name": "Dmitriy Zaporozhets",
-            "email": "dmitriy.zaporozhets@gmail.com"
-          }
-        }
-      ],
-      "total_commits_count": 1
-    },
-    "target_title": null
-  },
-  {
-    "title": null,
-    "project_id": 15,
-    "action_name": "closed",
-    "target_id": 840,
-    "target_type": "Issue",
-    "author_id": 1,
-    "data": null,
-    "target_title": "Finish & merge Code search PR",
-    "author": {
-      "name": "Dmitriy Zaporozhets",
-      "username": "root",
-      "id": 1,
-      "state": "active",
-      "avatar_url": "http://localhost:3000/uploads/user/avatar/1/fox_avatar.png",
-      "web_url": "http://localhost:3000/root"
-    },
-    "author_username": "root"
-  },
-  {
-    "title": null,
-    "project_id": 15,
-    "action_name": "commented on",
-    "target_id": 1312,
-    "target_type": "Note",
-    "author_id": 1,
-    "data": null,
-    "target_title": null,
-    "created_at": "2015-12-04T10:33:58.089Z",
-    "note": {
-      "id": 1312,
-      "body": "What an awesome day!",
-      "attachment": null,
-      "author": {
-        "name": "Dmitriy Zaporozhets",
-        "username": "root",
-        "id": 1,
-        "state": "active",
-        "avatar_url": "http://localhost:3000/uploads/user/avatar/1/fox_avatar.png",
-        "web_url": "http://localhost:3000/root"
-      },
-      "created_at": "2015-12-04T10:33:56.698Z",
-      "system": false,
-      "noteable_id": 377,
-      "noteable_type": "Issue"
-    },
-    "author": {
-      "name": "Dmitriy Zaporozhets",
-      "username": "root",
-      "id": 1,
-      "state": "active",
-      "avatar_url": "http://localhost:3000/uploads/user/avatar/1/fox_avatar.png",
-      "web_url": "http://localhost:3000/root"
-    },
-    "author_username": "root"
-  }
-]
-```
+Please refer to the [Events API documentation](events.md#list-a-projects-visible-events)
 
 ### Create project
 
diff --git a/doc/api/users.md b/doc/api/users.md
index 7e118dcf4a9..f4167ba2605 100644
--- a/doc/api/users.md
+++ b/doc/api/users.md
@@ -701,147 +701,8 @@ Will return `201 OK` on success, `404 User Not Found` is user cannot be found or
 
 ### Get user contribution events
 
-Get the contribution events for the specified user, sorted from newest to oldest.
+Please refer to the [Events API documentation](events.md#get-user-contribution-events)
 
-```
-GET /users/:id/events
-```
-
-Parameters:
-
-| Attribute | Type | Required | Description |
-| --------- | ---- | -------- | ----------- |
-| `id` | integer | yes | The ID of the user |
-
-```bash
-curl --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" https://gitlab.example.com/api/v4/users/:id/events
-```
-
-Example response:
-
-```json
-[
-  {
-    "title": null,
-    "project_id": 15,
-    "action_name": "closed",
-    "target_id": 830,
-    "target_type": "Issue",
-    "author_id": 1,
-    "data": null,
-    "target_title": "Public project search field",
-    "author": {
-      "name": "Dmitriy Zaporozhets",
-      "username": "root",
-      "id": 1,
-      "state": "active",
-      "avatar_url": "http://localhost:3000/uploads/user/avatar/1/fox_avatar.png",
-      "web_url": "http://localhost:3000/root"
-    },
-    "author_username": "root"
-  },
-  {
-    "title": null,
-    "project_id": 15,
-    "action_name": "opened",
-    "target_id": null,
-    "target_type": null,
-    "author_id": 1,
-    "author": {
-      "name": "Dmitriy Zaporozhets",
-      "username": "root",
-      "id": 1,
-      "state": "active",
-      "avatar_url": "http://localhost:3000/uploads/user/avatar/1/fox_avatar.png",
-      "web_url": "http://localhost:3000/root"
-    },
-    "author_username": "john",
-    "data": {
-      "before": "50d4420237a9de7be1304607147aec22e4a14af7",
-      "after": "c5feabde2d8cd023215af4d2ceeb7a64839fc428",
-      "ref": "refs/heads/master",
-      "user_id": 1,
-      "user_name": "Dmitriy Zaporozhets",
-      "repository": {
-        "name": "gitlabhq",
-        "url": "git@dev.gitlab.org:gitlab/gitlabhq.git",
-        "description": "GitLab: self hosted Git management software. \r\nDistributed under the MIT License.",
-        "homepage": "https://dev.gitlab.org/gitlab/gitlabhq"
-      },
-      "commits": [
-        {
-          "id": "c5feabde2d8cd023215af4d2ceeb7a64839fc428",
-          "message": "Add simple search to projects in public area",
-          "timestamp": "2013-05-13T18:18:08+00:00",
-          "url": "https://dev.gitlab.org/gitlab/gitlabhq/commit/c5feabde2d8cd023215af4d2ceeb7a64839fc428",
-          "author": {
-            "name": "Dmitriy Zaporozhets",
-            "email": "dmitriy.zaporozhets@gmail.com"
-          }
-        }
-      ],
-      "total_commits_count": 1
-    },
-    "target_title": null
-  },
-  {
-    "title": null,
-    "project_id": 15,
-    "action_name": "closed",
-    "target_id": 840,
-    "target_type": "Issue",
-    "author_id": 1,
-    "data": null,
-    "target_title": "Finish & merge Code search PR",
-    "author": {
-      "name": "Dmitriy Zaporozhets",
-      "username": "root",
-      "id": 1,
-      "state": "active",
-      "avatar_url": "http://localhost:3000/uploads/user/avatar/1/fox_avatar.png",
-      "web_url": "http://localhost:3000/root"
-    },
-    "author_username": "root"
-  },
-  {
-    "title": null,
-    "project_id": 15,
-    "action_name": "commented on",
-    "target_id": 1312,
-    "target_type": "Note",
-    "author_id": 1,
-    "data": null,
-    "target_title": null,
-    "created_at": "2015-12-04T10:33:58.089Z",
-    "note": {
-      "id": 1312,
-      "body": "What an awesome day!",
-      "attachment": null,
-      "author": {
-        "name": "Dmitriy Zaporozhets",
-        "username": "root",
-        "id": 1,
-        "state": "active",
-        "avatar_url": "http://localhost:3000/uploads/user/avatar/1/fox_avatar.png",
-        "web_url": "http://localhost:3000/root"
-      },
-      "created_at": "2015-12-04T10:33:56.698Z",
-      "system": false,
-      "noteable_id": 377,
-      "noteable_type": "Issue"
-    },
-    "author": {
-      "name": "Dmitriy Zaporozhets",
-      "username": "root",
-      "id": 1,
-      "state": "active",
-      "avatar_url": "http://localhost:3000/uploads/user/avatar/1/fox_avatar.png",
-      "web_url": "http://localhost:3000/root"
-    },
-    "author_username": "root"
-  }
-]
-```
 
 ## Get all impersonation tokens of a user
 
diff --git a/lib/api/api.rb b/lib/api/api.rb
index 7ae2f3cad40..88f91c07194 100644
--- a/lib/api/api.rb
+++ b/lib/api/api.rb
@@ -94,6 +94,7 @@ module API
     mount ::API::DeployKeys
     mount ::API::Deployments
     mount ::API::Environments
+    mount ::API::Events
     mount ::API::Features
     mount ::API::Files
     mount ::API::Groups
diff --git a/lib/api/events.rb b/lib/api/events.rb
new file mode 100644
index 00000000000..ed5df268ae3
--- /dev/null
+++ b/lib/api/events.rb
@@ -0,0 +1,86 @@
+module API
+  class Events < Grape::API
+    include PaginationParams
+
+    helpers do
+      params :event_filter_params do
+        optional :action, type: String, values: Event.actions, desc: 'Event action to filter on'
+        optional :target_type, type: String, values: Event.target_types, desc: 'Event target type to filter on'
+        optional :before, type: Date, desc: 'Include only events created before this date'
+        optional :after, type: Date, desc: 'Include only events created after this date'
+      end
+
+      params :sort_params do
+        optional :sort, type: String, values: %w[asc desc], default: 'desc',
+                        desc: 'Return events sorted in ascending and descending order'
+      end
+
+      def present_events(events)
+        events = events.reorder(created_at: params[:sort])
+
+        present paginate(events), with: Entities::Event
+      end
+    end
+
+    resource :events do
+      desc "List currently authenticated user's events" do
+        detail 'This feature was introduced in GitLab 9.3.'
+        success Entities::Event
+      end
+      params do
+        use :pagination
+        use :event_filter_params
+        use :sort_params
+      end
+      get do
+        authenticate!
+
+        events = EventsFinder.new(params.merge(source: current_user, current_user: current_user)).execute.preload(:author, :target)
+
+        present_events(events)
+      end
+    end
+
+    params do
+      requires :id, type: Integer, desc: 'The ID of the user'
+    end
+    resource :users do
+      desc 'Get the contribution events of a specified user' do
+        detail 'This feature was introduced in GitLab 8.13.'
+        success Entities::Event
+      end
+      params do
+        use :pagination
+        use :event_filter_params
+        use :sort_params
+      end
+      get ':id/events' do
+        user = User.find_by(id: params[:id])
+        not_found!('User') unless user
+
+        events = EventsFinder.new(params.merge(source: user, current_user: current_user)).execute.preload(:author, :target)
+
+        present_events(events)
+      end
+    end
+
+    params do
+      requires :id, type: String, desc: 'The ID of a project'
+    end
+    resource :projects, requirements: { id: %r{[^/]+} } do
+      desc "List a Project's visible events" do
+        success Entities::Event
+      end
+      params do
+        use :pagination
+        use :event_filter_params
+        use :sort_params
+      end
+      get ":id/events" do
+        events = EventsFinder.new(params.merge(source: user_project, current_user: current_user)).execute.preload(:author, :target)
+
+        present_events(events)
+      end
+    end
+  end
+end
diff --git a/lib/api/projects.rb b/lib/api/projects.rb
index deac3934d57..56046742e08 100644
--- a/lib/api/projects.rb
+++ b/lib/api/projects.rb
@@ -167,16 +167,6 @@ module API
                               user_can_admin_project: can?(current_user, :admin_project, user_project), statistics: params[:statistics]
       end
 
-      desc 'Get events for a single project' do
-        success Entities::Event
-      end
-      params do
-        use :pagination
-      end
-      get ":id/events" do
-        present paginate(user_project.events.recent), with: Entities::Event
-      end
-
       desc 'Fork new project for the current user or provided namespace.' do
         success Entities::Project
       end
diff --git a/lib/api/users.rb b/lib/api/users.rb
index e8694e90cf2..3f87a403a09 100644
--- a/lib/api/users.rb
+++ b/lib/api/users.rb
@@ -328,27 +328,6 @@ module API
         end
       end
 
-      desc 'Get the contribution events of a specified user' do
-        detail 'This feature was introduced in GitLab 8.13.'
-        success Entities::Event
-      end
-      params do
-        requires :id, type: Integer, desc: 'The ID of the user'
-        use :pagination
-      end
-      get ':id/events' do
-        user = User.find_by(id: params[:id])
-        not_found!('User') unless user
-
-        events = user.events.
-          merge(ProjectsFinder.new(current_user: current_user).execute).
-          references(:project).
-          with_associations.
-          recent
-
-        present paginate(events), with: Entities::Event
-      end
-
       params do
         requires :user_id, type: Integer, desc: 'The ID of the user'
       end
diff --git a/spec/finders/events_finder_spec.rb b/spec/finders/events_finder_spec.rb
new file mode 100644
index 00000000000..30a2bd14f10
--- /dev/null
+++ b/spec/finders/events_finder_spec.rb
@@ -0,0 +1,44 @@
+require 'spec_helper'
+
+describe EventsFinder do
+  let(:user) { create(:user) }
+  let(:other_user) { create(:user) }
+  let(:project1) { create(:empty_project, :private, creator_id: user.id, namespace: user.namespace) }
+  let(:project2) { create(:empty_project, :private, creator_id: user.id, namespace: user.namespace) }
+  let(:closed_issue) { create(:closed_issue, project: project1, author: user) }
+  let(:opened_merge_request) { create(:merge_request, source_project: project2, author: user) }
+  let!(:closed_issue_event) { create(:event, project: project1, author: user, target: closed_issue, action: Event::CLOSED, created_at: Date.new(2016, 12, 30)) }
+  let!(:opened_merge_request_event) { create(:event, project: project2, author: user, target: opened_merge_request, action: Event::CREATED, created_at: Date.new(2017, 1, 31)) }
+  let(:closed_issue2) { create(:closed_issue, project: project1, author: user) }
+  let(:opened_merge_request2) { create(:merge_request, source_project: project2, author: user) }
+  let!(:closed_issue_event2) { create(:event, project: project1, author: user, target: closed_issue, action: Event::CLOSED, created_at: Date.new(2016, 2, 2)) }
+  let!(:opened_merge_request_event2) { create(:event, project: project2, author: user, target: opened_merge_request, action: Event::CREATED, created_at: Date.new(2017, 2, 2)) }
+
+  context 'when targeting a user' do
+    it 'returns events between specified dates filtered on action and type' do
+      events = described_class.new(source: user, current_user: user, action: 'created', target_type: 'merge_request', after: Date.new(2017, 1, 1), before: Date.new(2017, 2, 1)).execute
+
+      expect(events).to eq([opened_merge_request_event])
+    end
+
+    it 'does not return events the current_user does not have access to' do
+      events = described_class.new(source: user, current_user: other_user).execute
+
+      expect(events).not_to include(opened_merge_request_event)
+    end
+  end
+
+  context 'when targeting a project' do
+    it 'returns project events between specified dates filtered on action and type' do
+      events = described_class.new(source: project1, current_user: user, action: 'closed', target_type: 'issue', after: Date.new(2016, 12, 1), before: Date.new(2017, 1, 1)).execute
+
+      expect(events).to eq([closed_issue_event])
+    end
+
+    it 'does not return events the current_user does not have access to' do
+      events = described_class.new(source: project2, current_user: other_user).execute
+
+      expect(events).to be_empty
+    end
+  end
+end
diff --git a/spec/requests/api/events_spec.rb b/spec/requests/api/events_spec.rb
new file mode 100644
index 00000000000..51e72c39a30
--- /dev/null
+++ b/spec/requests/api/events_spec.rb
@@ -0,0 +1,133 @@
+require 'spec_helper'
+
+describe API::Events, api: true  do
+  include ApiHelpers
+  let(:user) { create(:user) }
+  let(:non_member) { create(:user) }
+  let(:other_user) { create(:user, username: 'otheruser') }
+  let(:private_project) { create(:empty_project, :private, creator_id: user.id, namespace: user.namespace) }
+  let(:closed_issue) { create(:closed_issue, project: private_project, author: user) }
+  let!(:closed_issue_event) { create(:event, project: private_project, author: user, target: closed_issue, action: Event::CLOSED, created_at: Date.new(2016, 12, 30)) }
+
+  describe 'GET /events' do
+    context 'when unauthenticated' do
+      it 'returns authentication error' do
+        get api('/events')
+
+        expect(response).to have_http_status(401)
+      end
+    end
+
+    context 'when authenticated' do
+      it 'returns users events' do
+        get api('/events?action=closed&target_type=issue&after=2016-12-1&before=2016-12-31', user)
+
+        expect(response).to have_http_status(200)
+        expect(response).to include_pagination_headers
+        expect(json_response).to be_an Array
+        expect(json_response.size).to eq(1)
+      end
+    end
+  end
+
+  describe 'GET /users/:id/events' do
+    context "as a user that cannot see the event's project" do
+      it 'returns no events' do
+        get api("/users/#{user.id}/events", other_user)
+
+        expect(response).to have_http_status(200)
+        expect(json_response).to be_empty
+      end
+    end
+
+    context "as a user that can see the event's project" do
+      it 'returns the events' do
+        get api("/users/#{user.id}/events", user)
+
+        expect(response).to have_http_status(200)
+        expect(response).to include_pagination_headers
+        expect(json_response).to be_an Array
+        expect(json_response.size).to eq(1)
+      end
+
+      context 'when there are multiple events from different projects' do
+        let(:second_note) { create(:note_on_issue, project: create(:empty_project)) }
+
+        before do
+          second_note.project.add_user(user, :developer)
+
+          [second_note].each do |note|
+            EventCreateService.new.leave_note(note, user)
+          end
+        end
+
+        it 'returns events in the correct order (from newest to oldest)' do
+          get api("/users/#{user.id}/events", user)
+
+          comment_events = json_response.select { |e| e['action_name'] == 'commented on' }
+          close_events = json_response.select { |e| e['action_name'] == 'closed' }
+
+          expect(comment_events[0]['target_id']).to eq(second_note.id)
+          expect(close_events[0]['target_id']).to eq(closed_issue.id)
+        end
+
+        it 'accepts filter parameters' do
+          get api("/users/#{user.id}/events?action=closed&target_type=issue&after=2016-12-1&before=2016-12-31", user)
+
+          expect(json_response.size).to eq(1)
+          expect(json_response[0]['target_id']).to eq(closed_issue.id)
+        end
+      end
+    end
+
+    it 'returns a 404 error if not found' do
+      get api('/users/42/events', user)
+
+      expect(response).to have_http_status(404)
+      expect(json_response['message']).to eq('404 User Not Found')
+    end
+  end
+
+  describe 'GET /projects/:id/events' do
+    context 'when unauthenticated ' do
+      it 'returns 404 for private project' do
+        get api("/projects/#{private_project.id}/events")
+
+        expect(response).to have_http_status(404)
+      end
+
+      it 'returns 200 status for a public project' do
+        public_project = create(:empty_project, :public)
+
+        get api("/projects/#{public_project.id}/events")
+
+        expect(response).to have_http_status(200)
+      end
+    end
+
+    context 'when not permitted to read' do
+      it 'returns 404' do
+        get api("/projects/#{private_project.id}/events", non_member)
+
+        expect(response).to have_http_status(404)
+      end
+    end
+
+    context 'when authenticated' do
+      it 'returns project events' do
+        get api("/projects/#{private_project.id}/events?action=closed&target_type=issue&after=2016-12-1&before=2016-12-31", user)
+
+        expect(response).to have_http_status(200)
+        expect(response).to include_pagination_headers
+        expect(json_response).to be_an Array
+        expect(json_response.size).to eq(1)
+      end
+
+      it 'returns 404 if project does not exist' do
+        get api("/projects/1234/events", user)
+
+        expect(response).to have_http_status(404)
+      end
+    end
+  end
+end
diff --git a/spec/requests/api/projects_spec.rb b/spec/requests/api/projects_spec.rb
index c0ecb4d2aaa..86c57204971 100644
--- a/spec/requests/api/projects_spec.rb
+++ b/spec/requests/api/projects_spec.rb
@@ -762,64 +762,6 @@ describe API::Projects do
     end
   end
 
-  describe 'GET /projects/:id/events' do
-    shared_examples_for 'project events response' do
-      it 'returns the project events' do
-        member = create(:user)
-        create(:project_member, :developer, user: member, project: project)
-        note = create(:note_on_issue, note: 'What an awesome day!', project: project)
-        EventCreateService.new.leave_note(note, note.author)
-
-        get api("/projects/#{project.id}/events", current_user)
-
-        expect(response).to have_http_status(200)
-        expect(response).to include_pagination_headers
-        expect(json_response).to be_an Array
-
-        first_event = json_response.first
-        expect(first_event['action_name']).to eq('commented on')
-        expect(first_event['note']['body']).to eq('What an awesome day!')
-
-        last_event = json_response.last
-
-        expect(last_event['action_name']).to eq('joined')
-        expect(last_event['project_id'].to_i).to eq(project.id)
-        expect(last_event['author_username']).to eq(member.username)
-        expect(last_event['author']['name']).to eq(member.name)
-      end
-    end
-
-    context 'when unauthenticated' do
-      it_behaves_like 'project events response' do
-        let(:project) { create(:empty_project, :public) }
-        let(:current_user) { nil }
-      end
-    end
-
-    context 'when authenticated' do
-      context 'valid request' do
-        it_behaves_like 'project events response' do
-          let(:current_user) { user }
-        end
-      end
-
-      it 'returns a 404 error if not found' do
-        get api('/projects/42/events', user)
-
-        expect(response).to have_http_status(404)
-        expect(json_response['message']).to eq('404 Project Not Found')
-      end
-
-      it 'returns a 404 error if user is not a member' do
-        other_user = create(:user)
-
-        get api("/projects/#{project.id}/events", other_user)
-
-        expect(response).to have_http_status(404)
-      end
-    end
-  end
-
   describe 'GET /projects/:id/users' do
     shared_examples_for 'project users response' do
       it 'returns the project users' do
diff --git a/spec/requests/api/users_spec.rb b/spec/requests/api/users_spec.rb
index 1c33b8f9502..4efc3e1a1e2 100644
--- a/spec/requests/api/users_spec.rb
+++ b/spec/requests/api/users_spec.rb
@@ -1130,83 +1130,6 @@ describe API::Users do
     end
   end
 
-  describe 'GET /users/:id/events' do
-    let(:user) { create(:user) }
-    let(:project) { create(:empty_project) }
-    let(:note) { create(:note_on_issue, note: 'What an awesome day!', project: project) }
-
-    before do
-      project.add_user(user, :developer)
-      EventCreateService.new.leave_note(note, user)
-    end
-
-    context "as a user than cannot see the event's project" do
-      it 'returns no events' do
-        other_user = create(:user)
-
-        get api("/users/#{user.id}/events", other_user)
-
-        expect(response).to have_http_status(200)
-        expect(json_response).to be_empty
-      end
-    end
-
-    context "as a user than can see the event's project" do
-      context 'joined event' do
-        it 'returns the "joined" event' do
-          get api("/users/#{user.id}/events", user)
-
-          expect(response).to have_http_status(200)
-          expect(response).to include_pagination_headers
-          expect(json_response).to be_an Array
-
-          comment_event = json_response.find { |e| e['action_name'] == 'commented on' }
-
-          expect(comment_event['project_id'].to_i).to eq(project.id)
-          expect(comment_event['author_username']).to eq(user.username)
-          expect(comment_event['note']['id']).to eq(note.id)
-          expect(comment_event['note']['body']).to eq('What an awesome day!')
-
-          joined_event = json_response.find { |e| e['action_name'] == 'joined' }
-
-          expect(joined_event['project_id'].to_i).to eq(project.id)
-          expect(joined_event['author_username']).to eq(user.username)
-          expect(joined_event['author']['name']).to eq(user.name)
-        end
-      end
-
-      context 'when there are multiple events from different projects' do
-        let(:second_note) { create(:note_on_issue, project: create(:empty_project)) }
-        let(:third_note) { create(:note_on_issue, project: project) }
-
-        before do
-          second_note.project.add_user(user, :developer)
-
-          [second_note, third_note].each do |note|
-            EventCreateService.new.leave_note(note, user)
-          end
-        end
-
-        it 'returns events in the correct order (from newest to oldest)' do
-          get api("/users/#{user.id}/events", user)
-
-          comment_events = json_response.select { |e| e['action_name'] == 'commented on' }
-
-          expect(comment_events[0]['target_id']).to eq(third_note.id)
-          expect(comment_events[1]['target_id']).to eq(second_note.id)
-          expect(comment_events[2]['target_id']).to eq(note.id)
-        end
-      end
-    end
-
-    it 'returns a 404 error if not found' do
-      get api('/users/42/events', user)
-
-      expect(response).to have_http_status(404)
-      expect(json_response['message']).to eq('404 User Not Found')
-    end
-  end
-
   context "user activities", :redis do
     let!(:old_active_user) { create(:user, last_activity_on: Time.utc(2000, 1, 1)) }
     let!(:newly_active_user) { create(:user, last_activity_on: 2.days.ago.midday) }