We realized that it was impossible to update the image of the home and
services carousels: since i am using the add_{type}_carousel() function,
it actually added a new slide instead of replacing the old one.
We need this one for tomorrow, so i made a workaround creating the
new slide, moving the relevant data from the old slide to the new, and
then removing the old slide. Yuck.
I use Sortable, exactly like HTMx’s sorting example does[0]. Had to
export the slug or ID of some entries to be able to add it in the hidden
input.
For forms that use ID instead of slug, had to use an input name other
than “id” because otherwise the swap would fail due to bug #1496[1]. It
is apparently fixed in a recent version of HTMx, but i did not want to
update for fear of behaviour changes.
[0]: https://htmx.org/examples/sortable/
[1]: https://github.com/bigskysoftware/htmx/issues/1496
If i parse everything, then the campsite type options no longer have
their minimum values preset, meaning that people have to input each and
every one of them.
There are types inaccessible to the authenticator role, such as
redsys_request, that can not be registered because that roles is unable
to get the OID of.
I could have moved these types to the public schema, but then it would
seem pointless to have a separate schema.
Had to change setup_redsys because admins can not read the current
encrypt key, thus it is not possible to `set encrypt_key =
coalesce(…, encrypt_key)`.
Not that it did much sense, anyway, as i was already inside the branch
of the if when encrpty_key is null.
However, it seems that this also affects in the `on conflict` update. I
assume this is because `excluded` is some kind of row of the relation
and has the same restrictions.
user.Language is the language set in the database for the user, that in
the case of guests is always going to be ‘und’, that means Redsys would
select Spanish for everyone.
It makes no sense to retrieve the same OIDs each and every connection,
because they are not going to change unless the database is reset,
something it is very unlikely to happen in production.
Thus, it is best to query them the first time the application connects
to the database, that it is done at startup to query the available
languages, and then reuse the OIDs.
I can get away of using an “unprotected” map, instead of sync.Map or a
map in tandem with sync.RWMutex, because the application establishes a
connection at startup from a single goroutine and it registers _all_
types we will need to register within the application’s lifespan, hence
it there will be no more writes to that map once the web server is
listening for incomming connections.
This is risky, however, and i hope i do not have to regret it.
Every company need to have its own merchant code and encryption key,
thus it is not possible to use environment variables to keep that data,
and i have to store it in the database.
I do not want to give SELECT permission on the encryption key to guest,
because i am going to fuck it up sooner or later, and everyone would be
able to read that secret; i know it would. Therefore, i need a security
definer function that takes the data to encrypt, use the key to encrypt
it, and returns the result; nobody else should have access to that key,
not even admins!
By the way, i found out that every merchant receives the same key, thus
it is not a problem to keep it in the repository.
Since i need that SQL function to encrypt the data, i thought that i may
go the whole nine yards and sign the request in PostgreSQL too, after
all the data to sign comes from there, and it has JSON functions to
create and base64-code an object.
Fortunately, pg_crypto has all the functions that i need, but i can no
longer keep that extension inside the auth schema, because it is used
from others, and the public schema, like every other extensions, seems
more appropriate.
Instead of having the list of currency and language codes that Redsys
uses as constants in the code, i moved that as field to the currency
and language relations, so i can simply pass the lang_tag to the
function and it can transform that tag to the correct code; the currency
is from the company’s relation, since it is the only currency used in
the whole application (for now).
As a consequence, i had to grant execute to currency and the parse_price
functions to guest, too.
To generate the test data used in the unit tests, i used a third-party
PHP implementation[0], but i only got from that the resulting base64-coded
JSON object and signature, using the same that as in the unit test, and
did not use any code from there.
PostgreSQL formats the JSON as text differently than most
implementations i have seen: it adds spaces between the key name and
the colons, and space between the value and the separating comma. The
first implementation used replace() to format the JSON as exactly as
the PHP implementation, so that the result matches, and then tried to do
generate the form by hand using the output from PostgreSQL without the
replace(), to verify that Redsys would still accept my input. Finally,
i adjusted the unit test to whatever pg_prove said it was getting from
the function.
I still have the form’s action hard-codded to the test environment, but
the idea is that administrators should be able to switch from test to
live themselves. That means that i need that info in the redsys
relation as well. I think this is one of the few use cases for SQL’s
types, because it is unlikely to change anytime soon, and i do not need
the actual labels.
Unfortunately, i could not use enumerations for the request’s
transaction type because i can not attach an arbitrary number to the
enum’s values. Having a relation is overkill, because i would need
a constant in Go to refer to its primary key anyway, thus i kept the
same constant i had before for that. Language and currency constant
went out, as this is in the corresponding relations.
In setup_redsys i must have a separate update if the encrypt_key is null
because PostgreSQL checks constraints before key conflict, and i do
not want to give a default value to the key if the row is not there yet.
The problem is that i want to use null to mean “keep the same password”,
because it is what i intend to do with the user-facing form: leave the
input empty to keep the same password.
As now Go needs to pass composite types back and forth with PostgreSQL,
i need to register these types, and i have to do it every time because
the only moment i have access to the non-pooled connection is in the
AfterConnect function, but at that point i have no idea whether the
user is going to request a payment. I do not know how much the
performance degrades because of this.
[0]: https://github.com/ssheduardo/sermepa/blob/master/src/Sermepa/Tpv/Tpv.php
The idea is that the booking form will be prefilled with the values
passed from that other mini-form, and the campsite type is implicit
due to the page where the form is located at, but i need to give it to
the booking page.
The booking page does not yet use that information.
The form is based on the one in the current website, but in a single
page instead of split into many pages; possibly each <fieldset> should
be in a separate page/view. The idea is for Oriol to check the design
and decide how it would be presented to the user, so i needed something
to show him first.
I hardcoded the **test** data for the customer’s Redsys account. Is
this bad? I hope not, but i am not really, really sure.
The data sent to Redsys is just a placeholder because there are booking
details that i do not know, like what i have to do with the “teenagers”
field or the area preferences, thus i can not yet have a booking
relation. Nevertheless, had to generate a random order number up to
12-chars in length or Redsys would refuse the payment, claiming that
the order is duplicated.
The Redsys package is based on the PHP code provided by Redsys
themselves, plus some hints at the implementations from various Go
packages that did not know why they were so complicated.
Had to grant select on table country to guest in order to show the
select with the country options.
I have changed the “Postal code” input in taxDetails for “Postcode”
because this is the spell that it is used in the current web, i did not
see a reason to change it—it is an accepted form—, and i did not want to
have inconsistencies between forms.
Oriol does not want to waste so much vertical space for the calendar,
and wants it to show in a carousel, initially with only 6 months, and
loading the next three each time the user scrolls past the last.
I now use HTMx in the public page too for this auto-loading behavior,
based on their “infinite scroll” example[0].
Had to put the /calendar URI inside campsites because in the
calendar.gohtml i do not know the current type’s UUID, and can not use
a relative URL to “add subdirectories”, because the type does not end
with a slash.
Had to change season.CollectCalendar to expect the first month and a
number of months to show, to be able to load only 6 or 3 months after
the current, for the initial carousel content, or after the last month
of the carousel.
[0]: https://htmx.org/examples/infinite-scroll/
I had to export the Calendar type from Season to use it from
campsite/types, and also renamed them because season.SeasonCalendar is
a bit redundant compared to just season.Calendar.
I still have not added the HTMx code to switch year because i am not
sure whether Oriol will want to show a whole year or just half a year.
The calculation for the text color taking into account the contrast with
the background is from [0].
[0]: https://www.smashingmagazine.com/2020/07/css-techniques-legibility/#foreground-contrast
In the old website, the prices where show with all the options, but in
the new design only a single price is show, that in the case of
campsites with options is the price per night of the “base” plus the
minimum options selected.
I want these because when there are changes in the signature i then have
to find where it is used, and it is easier to do when the compiler tells
you.
For relations it is less necessary because GoLand knows how to validate
SQL strings for them, but it seems to not work with functions,
apparently due to the lack of the “FROM” keyword.
Besides, it tx.FunctionName(ctx, params...) is shorter than
tx.Exec("select functions_name($1, $2…)", params...).
This is the text that introduces the carousel; it is not a spiel, but
this is what i call it.
It turns out that this text needs to have paragraphs and headings, much
like home’s slider, rather than the one in services page, thus no need
to change its font size or to align all items in the carousel in the
middle.
I can not reuse the carousel package because these carousels need the
campsite site’s slug as a first parameters: i can not have a relation
per campsite type, as i do in home and services pages, because the
campsite types are added by administration types; even if i had a
single relation for slides of home and services pages, these would go
in a different relation due to the foreign key to campsite type.
What i could reuse, however, is the Slide and SlideEntry types from
that package, although i had to export carousel.Translation to be usable
from the types package. I should change that to use locale.Translation,
but this was the easier option, or i would need to change the queries
and templates for carousel package too.
Besides that, they work exactly like the slides in home and services
pages.
I created a common template to show the company address in the footer
and the contact page, and then i realized Go did not like to output my
phone URL in the anchor without having the tel: schema in the template.
I then removed that variable and now the URL is created with tel: and
the phone number with its spaces removed.
I was not sure whether to use PostGIS to store the GPS location of the
company, as i am sure i will only use that point just to show the map.
However, just in case, it is not a big deal.
There is no way to change that from the administration pages for now,
because of time constraints, and it is very unlikely that they will
change the campgrounds’ location in the near future.
The location is in a separate table because i did not want to have to
change every test file, to be honest, but this also makes the map
“optional” without the need for NULL values.
I added the contact address to every public page because the new design
adds it to the footer, so i will be needing it everywhere, just like the
menu.
This calendar is supposed to be edited by admin users, but do not yet
have the complete JavaScript code to do so, thus for now i have made it
read-only.
This one has an input to select the icon. It makes no sense to choose
an icon only by name, thus a <select> is not appropriate, and had to
use a hidden input with a row of button to choose the icon from. This
works now only because there are very few icons; we’ll need to choose
a different approach when there are many more icons.
Since now the icons have to be defined in CSS for both the public and
admin sections, i had to split it into a separate file that both sites
can use. I considered the option to “include” that CSS with m4, like
i do for images in demo.sql, but it made everything too complicated
(e.g., having to call make for each change in the CSS), and decided to
load that CSS in a separate <link>.
I am using the US terms for campground and campsite, that’s why the
relation is called ‘campsite’ instead of ‘pitch’, but i used the wrong
terminology in the SVG map because the customer uses the UK term and
call themselves campsite, so i mixed things.
It is now the campground map and each individual area is a campsite,
as i have been using all along.
I intend to use the same SVG file for customers and employees, so i had
to change Oriol’s design to add a class to layers that are supposed to
be only for customers, like trees. These are hidden in the admin area.
I understood that customers and employees have to click on a campsite to
select it, and then they can book or whatever they need to do to them.
Since customers and employees most certainly will need to have different
listeners on campsites, i decided to add the link with JavaScript. To
do so, i need a custom XML attribute with the campsite’s identifier.
Since i have seen that all campsites have a label, i changed the
“identifier” to the unique combination (company_id, label). The
company_id is there because different companies could have the same
label; i left the campsite_id primary key for foreign constraints.
In this case, as a test, i add an <a> element to the campsite with a
link to edit it; we’ll discuss with Oriol what exactly it needs to do.
However, the original design had the labels in a different layer, that
interfered with the link, as the numbers must be above the path and
the link must wrap the path in order to “inherit” its shape. I had no
other recourse than to move the labels in the same layer as the paths’.
It makes easier to upload new images from the place where we need it,
instead of having to go to the media section each time.
It was a little messy, this one.
First of all, I realized that POSTint to /admin/media/picker to get the
new media field was wrong: i was not asking the server to “accept an
entity”, but only requesting a new HTML value, just like a GET to
/admin/media/upload requests the form to upload a new media, thus here
i should do the same, except i needed the query parameters to change the
field, which is fine—it is actually a different resource, thus a
different URL.
Then, i thought that i could not POST the upload to /admin/media,
because i returned a different HTML —the media field—, so i reused the
recently unused POST to /admin/media/picker to upload that file and
return the HTML for the field. It was wrong, because i was not
requesting the server to put the file as a subordinate of
/admin/media/picker, only /admin/media, but i did not come up with any
other solution.
Since i had two different upload functions now, i created uploadForm’s
Handle method to refactorize the duplicated logic to a single place.
Unfortunately, i did not work as i expected because uploadForm’s and
mediaPicker’s MustRender methods are different, and mediaPicker has to
embed uploadForm to render the form in the picker. That made me change
Handle’s output to a boolean and error in order for the HTTP handler
function know when to render the form with the error messages with the
proper MustRender handler.
However, I saw the opportunity of reusing that Handler method for
editMedia, that was doing mostly the same job, but had to call a
different Validate than uploadForm’s, because editMedia does not require
the uploaded file. That’s when i realized that i could use an interface
and that this interface could be reused not only within media but
throughout the application, and added HandleMultipart in form.
Had to create a different interface for multipart forms because they
need different parameters in Parse that non-multipart form, when i add
that interface, hence had to also change Parse to ParseForm to account
for the difference in signature; not a big deal.
After all that, i realized that i **could** POST to /admin/media in both
cases, because i always return “an HTML entity”, it just happens that
for the media section it is empty with a redirect, and for the picker is
the field. That made the whole Handle method a bit redundant, but i
left it nevertheless, as i find it slightly easier to read the
uploadMedia function now.
It made no sense to have a file upload in each form that needs a media,
because to reuse an existing media users would need to upload the exact
same file again; this is very unusual and unfriendly.
A better option is to have a “centralized” media section, where people
can upload files there, and then have a picker to select from there.
Ideally, there would be an upload option in the picker, but i did not
add it yet.
I’ve split the content from the media because i want users to have the
option to update a media, for instance when they need to upload a
reduced or cropped version of the same photo, without an edit they would
need to upload the file as a new media and then update all places where
the old version was used. And i did not want to trouble people that
uploads the same photo twice: without the separate relation, doing so
would throw a constraint error.
I do not believe there is any security problem to have all companies
link their media to the same file, as they were already readable by
everyone and could upload the data from a different company to their
own; in other words, it is not worse than it was now.
jordi fita mas