sp_redirect_publisher (Transact-SQL MetaData) Definition

Please note: that the following source code is provided and copyrighted by Microsoft and is for educational purpose only.
The meta data is from an SQL 2012 Server.

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Definition:

sys.sp_redirect_publisher(nvarchar @original_publisher
, nvarchar @publisher_db
, nvarchar @redirected_publisher)

MetaData:

 --   
--  Name: sp_redirect_publisher  
--   
--  Descriptions: Redirect the publisher of a published database to a   
--                new target publisher. Target can be an explicit node  
--                or a HADRon virtual network name.  
--   
--                If the target of the redirection is NULL, the current  
--                entry for the publisher database pair, if it exists,  
--                is removed.  
--   
--  Parameters: as defined in create statement  
--   
--  Returns: 0 - success, 1 - failure  
--           raise error on failure  
--   
--  Security: Public procedure invoked via RPC. db_owner check  
--   
create procedure sys.sp_redirect_publisher  
(  
    @original_publisher sysname,  
    @publisher_db sysname,  
    @redirected_publisher sysname = null  
)  
as  
begin  
    set nocount on  
     
    declare @dbname sysname = db_name()  
   
    --  Security check  
    --   
    if is_member(N'db_owner') <> 1  
    begin  
        raiserror (21873, 16, -1, 'sys.sp_redirect_publisher')  
        return 1  
    end  
      
    --  Has to be executed from a distribution database  
    --   
    if (sys.fn_MSrepl_isdistdb (@dbname) <> 1)  
    begin  
        raiserror(21874, 16, -1, 'sys.sp_redirect_publisher', @dbname)  
        return 1  
    end  
   
    --  Input parameters must both be non-null  
    --   
    if @original_publisher is null or  
        @publisher_db is null  
    begin  
        raiserror (21875, 16, -1, 'sys.sp_redirect_publisher')  
        return 1  
    end  
      
    if exists   
        (    select redirected_publisher from MSredirected_publishers  
            where publisher_db = rtrim(@publisher_db)  
            and   upper(original_publisher) = upper(rtrim(@original_publisher)))  
    begin  
        if @redirected_publisher is not null  
        begin  
            update MSredirected_publishers   
            set redirected_publisher = rtrim(@redirected_publisher)  
            where publisher_db = rtrim(@publisher_db)  
            and   upper(original_publisher) = upper(rtrim(@original_publisher))  
        end  
        else  
        begin  
            delete from MSredirected_publishers   
            where publisher_db = rtrim(@publisher_db)  
            and   upper(original_publisher) = upper(rtrim(@original_publisher))              
        end  
    end  
    else      
    begin  
        insert into MSredirected_publishers  
        values (rtrim(@original_publisher), rtrim(@publisher_db), rtrim(@redirected_publisher))  
    end       
          
    return 0                            
end