Add API support for looking up a user by username

Needed to support Huboard

4 files changed, 29 insertions, 5 deletions

diff --git a/CHANGELOG b/CHANGELOG
index a80b776affa..29a175bea80 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -4,6 +4,7 @@ v 8.4.0 (unreleased)
   - Fix Error 500 when doing a search in dashboard before visiting any project (Stan Hu)
   - Implement new UI for group page
   - Implement search inside emoji picker
+  - Add API support for looking up a user by username (Stan Hu)
   - Add project permissions to all project API endpoints (Stan Hu)
 
 v 8.3.1 (unreleased)
diff --git a/doc/api/users.md b/doc/api/users.md
index 7ba2db248ff..66d2fd52526 100644
--- a/doc/api/users.md
+++ b/doc/api/users.md
@@ -90,7 +90,17 @@ GET /users
 
 You can search for users by email or username with: `/users?search=John`
 
-Also see `def search query` in `app/models/user.rb`.
+In addition, you can lookup users by username:
+
+```
+GET /users?username=:username
+```
+
+For example:
+
+```
+GET /users?username=jack_smith
+```
 
 ## Single user
 
diff --git a/lib/api/users.rb b/lib/api/users.rb
index a98d668e02d..3400f0713ef 100644
--- a/lib/api/users.rb
+++ b/lib/api/users.rb
@@ -8,11 +8,17 @@ module API
       #
       # Example Request:
       #  GET /users
+      #  GET /users?search=Admin
+      #  GET /users?username=root
       get do
-        @users = User.all
-        @users = @users.active if params[:active].present?
-        @users = @users.search(params[:search]) if params[:search].present?
-        @users = paginate @users
+        if params[:username].present?
+          @users = User.where(username: params[:username])
+        else
+          @users = User.all
+          @users = @users.active if params[:active].present?
+          @users = @users.search(params[:search]) if params[:search].present?
+          @users = paginate @users
+        end
 
         if current_user.is_admin?
           present @users, with: Entities::UserFull
diff --git a/spec/requests/api/users_spec.rb b/spec/requests/api/users_spec.rb
index 2f609c63330..4f278551d07 100644
--- a/spec/requests/api/users_spec.rb
+++ b/spec/requests/api/users_spec.rb
@@ -27,6 +27,13 @@ describe API::API, api: true  do
           user['username'] == username
         end['username']).to eq(username)
       end
+
+      it "should return one user" do
+        get api("/users?username=#{omniauth_user.username}", user)
+        expect(response.status).to eq(200)
+        expect(json_response).to be_an Array
+        expect(json_response.first['username']).to eq(omniauth_user.username)
+      end
     end
 
     context "when admin" do