Refactor policy checks (#1536)

* Move policy checking logic inside PolicyService

* Refactor to use currentContext.ManagePolicies

* Make orgUser status check more semantic

* Fix single org user checks

* Use CoreHelper implementation to deserialize json

* Refactor policy checks to use db query

* Use new db query for enforcing 2FA Policy

* Add Policy_ReadByTypeApplicableToUser

* Stub out EF implementations

* Refactor: use PolicyRepository only

* Refactor tests

* Copy SQL queries to proj and update sqlproj file

* Refactor importCiphersAsync to use new method

* Add EF implementations and tests

* Refactor SQL to remove unnecessary operations

util/Migrator/DbScripts/2021-09-16_00_PolicyApplicableToUser.sql

@@ -0,0 +1,82 @@
+-- PolicyApplicableToUser
+IF OBJECT_ID('[dbo].[PolicyApplicableToUser]') IS NOT NULL
+BEGIN
+    DROP FUNCTION [dbo].[PolicyApplicableToUser]
+END
+GO
+
+CREATE FUNCTION [dbo].[PolicyApplicableToUser]
+(
+    @UserId UNIQUEIDENTIFIER,
+    @PolicyType TINYINT,
+    @MinimumStatus TINYINT
+)
+RETURNS TABLE
+AS RETURN
+SELECT
+    P.*
+FROM
+    [dbo].[PolicyView] P
+INNER JOIN
+    [dbo].[OrganizationUserView] OU ON P.[OrganizationId] = OU.[OrganizationId]
+LEFT JOIN
+    (SELECT
+        PU.UserId,
+        PO.OrganizationId
+    FROM
+        [dbo].[ProviderUserView] PU
+    INNER JOIN
+        [ProviderOrganizationView] PO ON PO.[ProviderId] = PU.[ProviderId]) PUPO
+    ON PUPO.UserId = OU.UserId
+    AND PUPO.OrganizationId = P.OrganizationId
+WHERE
+    OU.[UserId] = @UserId 
+    AND P.[Type] = @PolicyType
+    AND P.[Enabled] = 1
+    AND OU.[Status] >= @MinimumStatus
+    AND OU.[Type] >= 2              -- Not an owner (0) or admin (1)
+    AND (                           -- Can't manage policies
+        OU.[Permissions] IS NULL
+        OR COALESCE(JSON_VALUE(OU.[Permissions], '$.managePolicies'), 'false') = 'false'
+    )
+    AND PUPO.[UserId] IS NULL   -- Not a provider
+GO
+
+-- Policy_ReadByTypeApplicableToUser
+IF OBJECT_ID('[dbo].[Policy_ReadByTypeApplicableToUser]') IS NOT NULL
+BEGIN
+    DROP PROCEDURE [dbo].[Policy_ReadByTypeApplicableToUser]
+END
+GO
+
+CREATE PROCEDURE [dbo].[Policy_ReadByTypeApplicableToUser]
+    @UserId UNIQUEIDENTIFIER,
+    @PolicyType TINYINT,
+    @MinimumStatus TINYINT
+AS
+BEGIN
+    SET NOCOUNT ON
+
+    SELECT *
+    FROM [dbo].[PolicyApplicableToUser](@UserId, @PolicyType, @MinimumStatus)
+END
+GO
+
+-- Policy_CountByTypeApplicableToUser
+IF OBJECT_ID('[dbo].[Policy_CountByTypeApplicableToUser]') IS NOT NULL
+BEGIN
+    DROP PROCEDURE [dbo].[Policy_CountByTypeApplicableToUser]
+END
+GO
+
+CREATE PROCEDURE [dbo].[Policy_CountByTypeApplicableToUser]
+    @UserId UNIQUEIDENTIFIER,
+    @PolicyType TINYINT,
+    @MinimumStatus TINYINT
+AS
+BEGIN
+    SET NOCOUNT ON
+
+    SELECT COUNT(1)
+    FROM [dbo].[PolicyApplicableToUser](@UserId, @PolicyType, @MinimumStatus)
+END