Add support for creating random passwords in user creation API

To avoid having to specify an actual password to create users, admins
can now use the `force_random_password` parameter to let Devise generate
a password.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/63826

changelogs/unreleased/sh-add-force-random-password-user-api.yml

+---
+title: Add support for creating random passwords in user creation API
+merge_request: 30138
+author:
+type: changed

doc/api/users.md

@@ -272,7 +272,14 @@ GET /users/:id?with_custom_attributes=true
 
 ## User creation
 
-Creates a new user. Note only administrators can create new users. Either `password` or `reset_password` should be specified (`reset_password` takes priority). If `reset_password` is `false`, then `password` is required.
+Creates a new user. Note only administrators can create new
+users. Either `password`, `reset_password`, or `force_random_password`
+must be specified. If `reset_password` and `force_random_password` are
+both `false`, then `password` is required.
+
+Note that `force_random_password` and `reset_password` take priority
+over `password`. In addition, `reset_password` and
+`force_random_password` can be used together.
 
 ```
 POST /users
@@ -280,29 +287,30 @@ POST /users
 
 Parameters:
 
-- `email` (required)             - Email
-- `password` (optional)          - Password
-- `reset_password` (optional)    - Send user password reset link - true or false(default)
-- `username` (required)          - Username
-- `name` (required)              - Name
-- `skype` (optional)             - Skype ID
-- `linkedin` (optional)          - LinkedIn
-- `twitter` (optional)           - Twitter account
-- `website_url` (optional)       - Website URL
-- `organization` (optional)      - Organization name
-- `projects_limit` (optional)    - Number of projects user can create
-- `extern_uid` (optional)        - External UID
-- `provider` (optional)          - External provider name
-- `group_id_for_saml` (optional) - ID of group where SAML has been configured
-- `bio` (optional)               - User's biography
-- `location` (optional)          - User's location
-- `public_email` (optional)      - The public email of the user
-- `admin` (optional)             - User is admin - true or false (default)
-- `can_create_group` (optional)  - User can create groups - true or false
-- `skip_confirmation` (optional) - Skip confirmation - true or false (default)
-- `external` (optional)          - Flags the user as external - true or false(default)
-- `avatar` (optional)            - Image file for user's avatar
-- `private_profile` (optional)   - User's profile is private - true or false
+- `email` (required)                 - Email
+- `password` (optional)              - Password
+- `reset_password` (optional)        - Send user password reset link - true or false (default)
+- `force_random_password` (optional) - Set user password to a random value - true or false (default)
+- `username` (required)              - Username
+- `name` (required)                  - Name
+- `skype` (optional)                 - Skype ID
+- `linkedin` (optional)              - LinkedIn
+- `twitter` (optional)               - Twitter account
+- `website_url` (optional)           - Website URL
+- `organization` (optional)          - Organization name
+- `projects_limit` (optional)        - Number of projects user can create
+- `extern_uid` (optional)            - External UID
+- `provider` (optional)              - External provider name
+- `group_id_for_saml` (optional)     - ID of group where SAML has been configured
+- `bio` (optional)                   - User's biography
+- `location` (optional)              - User's location
+- `public_email` (optional)          - The public email of the user
+- `admin` (optional)                 - User is admin - true or false (default)
+- `can_create_group` (optional)      - User can create groups - true or false
+- `skip_confirmation` (optional)     - Skip confirmation - true or false (default)
+- `external` (optional)              - Flags the user as external - true or false(default)
+- `avatar` (optional)                - Image file for user's avatar
+- `private_profile` (optional)       - User's profile is private - true or false
 - `shared_runners_minutes_limit` (optional) - Pipeline minutes quota for this user
 - `extra_shared_runners_minutes_limit` (optional) - Extra pipeline minutes quota for this user
 

lib/api/users.rb

@@ -158,6 +158,7 @@ module API
         at_least_one_of :password, :reset_password
         requires :name, type: String, desc: 'The name of the user'
         requires :username, type: String, desc: 'The username of the user'
+        optional :force_random_password, type: Boolean, desc: 'Flag indicating a random password will be set'
         use :optional_attributes
       end
       post do

spec/requests/api/users_spec.rb

@@ -416,7 +416,6 @@ describe API::Users do
       expect(response).to have_gitlab_http_status(201)
       user_id = json_response['id']
       new_user = User.find(user_id)
-      expect(new_user).not_to eq(nil)
       expect(new_user.admin).to eq(true)
       expect(new_user.can_create_group).to eq(true)
     end
@@ -435,7 +434,6 @@ describe API::Users do
       expect(response).to have_gitlab_http_status(201)
       user_id = json_response['id']
       new_user = User.find(user_id)
-      expect(new_user).not_to eq(nil)
       expect(new_user.admin).to eq(false)
       expect(new_user.can_create_group).to eq(false)
     end
@@ -445,7 +443,6 @@ describe API::Users do
       expect(response).to have_gitlab_http_status(201)
       user_id = json_response['id']
       new_user = User.find(user_id)
-      expect(new_user).not_to eq(nil)
       expect(new_user.admin).to eq(false)
     end
 
@@ -460,7 +457,6 @@ describe API::Users do
 
       user_id = json_response['id']
       new_user = User.find(user_id)
-      expect(new_user).not_to eq nil
       expect(new_user.external).to be_falsy
     end
 
@@ -470,7 +466,6 @@ describe API::Users do
 
       user_id = json_response['id']
       new_user = User.find(user_id)
-      expect(new_user).not_to eq nil
       expect(new_user.external).to be_truthy
     end
 
@@ -482,7 +477,19 @@ describe API::Users do
       user_id = json_response['id']
       new_user = User.find(user_id)
 
-      expect(new_user).not_to eq(nil)
+      expect(new_user.recently_sent_password_reset?).to eq(true)
+    end
+
+    it "creates user with random password" do
+      params = attributes_for(:user, force_random_password: true, reset_password: true)
+      post api('/users', admin), params: params
+
+      expect(response).to have_gitlab_http_status(201)
+
+      user_id = json_response['id']
+      new_user = User.find(user_id)
+
+      expect(new_user.valid_password?(params[:password])).to eq(false)
       expect(new_user.recently_sent_password_reset?).to eq(true)
     end