theking2 / qr-shortener

QR Code generator and url shortener

(currently deployed at https://qr.sbw.media)

Setup

Decide on the length of the codes. Currently 5 characters. This has to be changed in the code table and the two stored functions set_url and get_url.

Configuration

Sample contents of the app.conf file in the root

base_url = https://qr.fab.io/
default_url = https://cie.fabulous.com

[db]
server = localhost
name = dbname
user = dbuser
passwort = dbpass

Database

In app.conf the database connection is configured.

urls

In app.conf two urls need to be configured, the base for the qr codes and the default when opening. make sure there is a trailing /!.

The later maybe empty but contains the default value for url

DB – setup

The main table for code/url translation

table and view

create table `code` (
  `code` char(5) character set ascii collate ascii_bin not null,
  `url` varchar(240) character set ascii collate ascii_bin default null,
  `last_used` datetime not null default '0000-00-00 00:00:00',
  `hits` int(10) unsigned not null default 0,
  primary key (`code`) using hash,
  key `url` (`url`) using hash
) engine=myisam default charset=latin1 collate=latin1_bin pack_keys=0 row_format=redundant;

To populate this table run make-shorts.php View to get used and total number of codes:

create view `used` as
select
  count(`code`.`url`) AS `urls`
, count(0) AS `total` from `code`

routines

Routine to get a url based on the code, updating hit and last_used.

create function `get_url`(`c` char(5)) returns varchar(255) charset utf8
begin
  declare result varchar(255);
  update code
	set
    hits = hits + 1
  , last_used=current_timestamp()
  where code = c;

  return (
		select url
    from code
    where code = c
	);
end ;;

routine to reserve a code for a url

create function `set_url`(`the_url` varchar(255)) returns char(5) charset ascii
begin
	declare result char(5);

  select `code` into result from `code` where url = the_url limit 1;
  if result is null then
    select `code` into result from `code` where url is null limit 1;
	  update `code`
    set
      url=the_url
    where `code` = result;
	end if;
  return result;
end ;;

Thirds

The qr svg generator is davidshimjs/qrcodejs. Very, very losely based on heytuts