feat: support filtering users table by login type (#17238)

#15896 Mentions ability to add support for filtering by login type

The issue mentions that backend API support exists but the backend did
not seem to have the support for this filter. So I have added the
ability to filter it.

I also added a corresponding update to readme file to make sure the docs
will correctly showcase this feature

coderd/database/dbmem/dbmem.go

@@ -6824,6 +6824,18 @@ func (q *FakeQuerier) GetUsers(_ context.Context, params database.GetUsersParams
 		users = usersFilteredByRole
 	}
 
+	if len(params.LoginType) > 0 {
+		usersFilteredByLoginType := make([]database.User, 0, len(users))
+		for i, user := range users {
+			if slice.ContainsCompare(params.LoginType, user.LoginType, func(a, b database.LoginType) bool {
+				return strings.EqualFold(string(a), string(b))
+			}) {
+				usersFilteredByLoginType = append(usersFilteredByLoginType, users[i])
+			}
+		}
+		users = usersFilteredByLoginType
+	}
+
 	if !params.CreatedBefore.IsZero() {
 		usersFilteredByCreatedAt := make([]database.User, 0, len(users))
 		for i, user := range users {

coderd/database/modelqueries.go

@@ -395,6 +395,7 @@ func (q *sqlQuerier) GetAuthorizedUsers(ctx context.Context, arg GetUsersParams,
 		arg.CreatedAfter,
 		arg.IncludeSystem,
 		arg.GithubComUserID,
+		pq.Array(arg.LoginType),
 		arg.OffsetOpt,
 		arg.LimitOpt,
 	)

coderd/database/queries.sql.go

@@ -12410,16 +12410,22 @@ WHERE
 			github_com_user_id = $10
 		ELSE true
 	END
+	-- Filter by login_type
+	AND CASE
+		WHEN cardinality($11 :: login_type[]) > 0 THEN
+			login_type = ANY($11 :: login_type[])
+		ELSE true
+	END
 	-- End of filters
 
 	-- Authorize Filter clause will be injected below in GetAuthorizedUsers
 	-- @authorize_filter
 ORDER BY
 	-- Deterministic and consistent ordering of all users. This is to ensure consistent pagination.
-	LOWER(username) ASC OFFSET $11
+	LOWER(username) ASC OFFSET $12
 LIMIT
 	-- A null limit means "no limit", so 0 means return all
-	NULLIF($12 :: int, 0)
+	NULLIF($13 :: int, 0)
 `
 
 type GetUsersParams struct {
@@ -12433,6 +12439,7 @@ type GetUsersParams struct {
 	CreatedAfter    time.Time    `db:"created_after" json:"created_after"`
 	IncludeSystem   bool         `db:"include_system" json:"include_system"`
 	GithubComUserID int64        `db:"github_com_user_id" json:"github_com_user_id"`
+	LoginType       []LoginType  `db:"login_type" json:"login_type"`
 	OffsetOpt       int32        `db:"offset_opt" json:"offset_opt"`
 	LimitOpt        int32        `db:"limit_opt" json:"limit_opt"`
 }
@@ -12472,6 +12479,7 @@ func (q *sqlQuerier) GetUsers(ctx context.Context, arg GetUsersParams) ([]GetUse
 		arg.CreatedAfter,
 		arg.IncludeSystem,
 		arg.GithubComUserID,
+		pq.Array(arg.LoginType),
 		arg.OffsetOpt,
 		arg.LimitOpt,
 	)

coderd/database/queries/users.sql

@@ -260,6 +260,12 @@ WHERE
 			github_com_user_id = @github_com_user_id
 		ELSE true
 	END
+	-- Filter by login_type
+	AND CASE
+		WHEN cardinality(@login_type :: login_type[]) > 0 THEN
+			login_type = ANY(@login_type :: login_type[])
+		ELSE true
+	END
 	-- End of filters
 
 	-- Authorize Filter clause will be injected below in GetAuthorizedUsers