Add the skeleton of the web application
It does nothing more than to server a single page that does nothing
interesting.
This time i do not use a router. Instead, i am trying out a technique
i have seen in an article[0] that i have tried in other, smaller,
projects and seems to work surprisingly well: it just “cuts off” the
URI path by path, passing the request from handler to handler until
it finds its way to a handler that actually serves the request.
That helps to loosen the coupling between the application and lower
handlers, and makes dependencies explicit, because i need to pass the
locale, company, etc. down instead of storing them in contexts. Let’s
see if i do not regret it on a later date.
I also made a lot more packages that in Numerus. In Numerus i actually
only have the single pkg package, and it works, kind of, but i notice
how i name my methods to avoid clashing instead of using packages for
that. That is, instead of pkg.NewApp i now have app.New.
Initially i thought that Locale should be inside app, but then there was
a circular dependency between app and template. That is why i created a
separate package, but now i am wondering if template should be inside
app too, but then i would have app.MustRenderTemplate instead of
template.MustRender.
The CSS is the most bare-bones file i could write because i am focusing
in markup right now; Oriol will fill in the file once the application is
working.
[0]: https://blog.merovius.de/posts/2017-06-18-how-not-to-use-an-http-router/
2023-07-22 22:11:00 +00:00
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<!--
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SPDX-FileCopyrightText: 2023 jordi fita mas <jordi@tandem.blog>
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SPDX-License-Identifier: AGPL-3.0-only
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-->
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<!doctype html>
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<html lang="{{ currentLocale }}">
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<title>{{ template "title" . }} — Camper</title>
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2023-07-23 18:44:06 +00:00
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<link rel="stylesheet" media="screen" href="/static/camper.css">
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2023-09-25 18:10:33 +00:00
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<link rel="stylesheet" media="screen" href="/static/icons.css">
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2023-12-20 18:52:14 +00:00
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<script src="/static/sortable@1.15.1.min.js"></script>
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2023-12-22 02:27:49 +00:00
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<script src="/static/alpinejs@3.13.3.min.js" defer></script>
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Add the logout button
Conceptually, to logout we have to “delete the session”, thus the best
HTTP verb would be `DELETE`. However, there is no way to send a
`DELETE` request with a regular HTML form, and it seems that never will
be[0].
I could use a POST, optionally with a “method override” technique, but
i was planing to use HTMx anyway, so this was as good an opportunity to
include it as any.
In this application i am not concerned with people not having JavaScript
enabled, because it is for a customer that has a known environment, and
we do not have much time anyway. Therefore, i opted to forgo
progressive enhancement in cases like this: if `DELETE` is needed, use
`hx-delete`.
Unfortunately, i can not use a <form> with a hidden <input> for the
CSRF token, because `DELETE` requests do not have body and the value
should be added as query parameters, like a form with GET method, but
HTMx does the incorrect thing here: sends the values in the request’s
body. That’s why i have to use a custom header and the `hx-header`
directive to include the CSRF token.
Then, by default HTMx targets the triggered element for swap with the
response from the server, but after a logout i want to redirect the
user to the login form again. I could set the hx-target to button to
replace the whole body, or tell the client to redirect to the new
location. I actually do not know which one is “better”. Maybe the
hx-target is best because then everything is handled by the client, but
in the case of logout, since it is possible that i might want to load
scripts only for logged-in users in the future, i opted for the full
page reload.
However, HTMx does not want to reload a page that return HTTP 401,
hence i had to include the GET method to /login in order to return the
login form with a response of HTTP 200, which also helps when
reloading in the browser after a failed login attempt. I am not worried
with the HTTP 401 when attempting to load a page as guest, because
this request most probably comes from the browser, not HTMx, and it will
show the login form as intended—even though it is not compliant, since
it does not return the WWW-Authenticate header, but this is the best i
can do given that no cookie-based authentication method has been
accepted[1].
[0]: https://www.w3.org/Bugs/Public/show_bug.cgi?id=10671#c16
[1]: https://datatracker.ietf.org/doc/id/draft-broyer-http-cookie-auth-00.html
2023-07-26 11:49:47 +00:00
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<script src="/static/htmx@1.9.3.min.js"></script>
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2023-12-20 18:52:14 +00:00
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<script type="module" src="/static/camper.js"></script>
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2023-08-04 17:59:58 +00:00
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{{ block "head" . }}{{ end }}
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Add the skeleton of the web application
It does nothing more than to server a single page that does nothing
interesting.
This time i do not use a router. Instead, i am trying out a technique
i have seen in an article[0] that i have tried in other, smaller,
projects and seems to work surprisingly well: it just “cuts off” the
URI path by path, passing the request from handler to handler until
it finds its way to a handler that actually serves the request.
That helps to loosen the coupling between the application and lower
handlers, and makes dependencies explicit, because i need to pass the
locale, company, etc. down instead of storing them in contexts. Let’s
see if i do not regret it on a later date.
I also made a lot more packages that in Numerus. In Numerus i actually
only have the single pkg package, and it works, kind of, but i notice
how i name my methods to avoid clashing instead of using packages for
that. That is, instead of pkg.NewApp i now have app.New.
Initially i thought that Locale should be inside app, but then there was
a circular dependency between app and template. That is why i created a
separate package, but now i am wondering if template should be inside
app too, but then i would have app.MustRenderTemplate instead of
template.MustRender.
The CSS is the most bare-bones file i could write because i am focusing
in markup right now; Oriol will fill in the file once the application is
working.
[0]: https://blog.merovius.de/posts/2017-06-18-how-not-to-use-an-http-router/
2023-07-22 22:11:00 +00:00
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</head>
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<body>
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2023-09-28 00:23:25 +00:00
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<a href="#content">{{( gettext "Skip to main content" )}}</a>
|
Add the skeleton of the web application
It does nothing more than to server a single page that does nothing
interesting.
This time i do not use a router. Instead, i am trying out a technique
i have seen in an article[0] that i have tried in other, smaller,
projects and seems to work surprisingly well: it just “cuts off” the
URI path by path, passing the request from handler to handler until
it finds its way to a handler that actually serves the request.
That helps to loosen the coupling between the application and lower
handlers, and makes dependencies explicit, because i need to pass the
locale, company, etc. down instead of storing them in contexts. Let’s
see if i do not regret it on a later date.
I also made a lot more packages that in Numerus. In Numerus i actually
only have the single pkg package, and it works, kind of, but i notice
how i name my methods to avoid clashing instead of using packages for
that. That is, instead of pkg.NewApp i now have app.New.
Initially i thought that Locale should be inside app, but then there was
a circular dependency between app and template. That is why i created a
separate package, but now i am wondering if template should be inside
app too, but then i would have app.MustRenderTemplate instead of
template.MustRender.
The CSS is the most bare-bones file i could write because i am focusing
in markup right now; Oriol will fill in the file once the application is
working.
[0]: https://blog.merovius.de/posts/2017-06-18-how-not-to-use-an-http-router/
2023-07-22 22:11:00 +00:00
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<header>
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<h1>camper _ws</h1>
|
Add the logout button
Conceptually, to logout we have to “delete the session”, thus the best
HTTP verb would be `DELETE`. However, there is no way to send a
`DELETE` request with a regular HTML form, and it seems that never will
be[0].
I could use a POST, optionally with a “method override” technique, but
i was planing to use HTMx anyway, so this was as good an opportunity to
include it as any.
In this application i am not concerned with people not having JavaScript
enabled, because it is for a customer that has a known environment, and
we do not have much time anyway. Therefore, i opted to forgo
progressive enhancement in cases like this: if `DELETE` is needed, use
`hx-delete`.
Unfortunately, i can not use a <form> with a hidden <input> for the
CSRF token, because `DELETE` requests do not have body and the value
should be added as query parameters, like a form with GET method, but
HTMx does the incorrect thing here: sends the values in the request’s
body. That’s why i have to use a custom header and the `hx-header`
directive to include the CSRF token.
Then, by default HTMx targets the triggered element for swap with the
response from the server, but after a logout i want to redirect the
user to the login form again. I could set the hx-target to button to
replace the whole body, or tell the client to redirect to the new
location. I actually do not know which one is “better”. Maybe the
hx-target is best because then everything is handled by the client, but
in the case of logout, since it is possible that i might want to load
scripts only for logged-in users in the future, i opted for the full
page reload.
However, HTMx does not want to reload a page that return HTTP 401,
hence i had to include the GET method to /login in order to return the
login form with a response of HTTP 200, which also helps when
reloading in the browser after a failed login attempt. I am not worried
with the HTTP 401 when attempting to load a page as guest, because
this request most probably comes from the browser, not HTMx, and it will
show the login form as intended—even though it is not compliant, since
it does not return the WWW-Authenticate header, but this is the best i
can do given that no cookie-based authentication method has been
accepted[1].
[0]: https://www.w3.org/Bugs/Public/show_bug.cgi?id=10671#c16
[1]: https://datatracker.ietf.org/doc/id/draft-broyer-http-cookie-auth-00.html
2023-07-26 11:49:47 +00:00
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{{ if isLoggedIn -}}
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2023-07-26 18:46:09 +00:00
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<nav>
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<details>
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<summary>
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Allow users to update their profile images
I do not see the profile image as an “integral part” of the user (i.e.,
no need for constraints), hence i do not want to store it in the
database, as would do for the identification image during check-in.
By default, i store the avatars in /var/lib/camper/avatars, but it is a
variable to allow packagers change this value using the linker.
This is also served as a test bed for uploading files to the server,
that now has a better interface and uses less resources that what i did
to Numerus.
Now the profile handler needs to keep a variable to know the path to the
avatars’ directory, thus i had to change it to a struct nested in app,
much like the fileHandler does. It still has to return the HandlerFunc,
however, as this function needs to close over the user and connection
variables.
Part of #7.
2023-07-28 18:15:09 +00:00
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<img src="/me/avatar" alt="{{( gettext "Avatar" )}}" width="70" height="70">
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2023-07-26 18:46:09 +00:00
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<span>{{( pgettext "User Menu" "title" )}}</span>
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</summary>
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2023-08-15 18:52:14 +00:00
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<ul>
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2023-10-27 14:04:43 +00:00
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<li>
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2023-08-15 18:52:14 +00:00
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<a href="/me">{{( pgettext "Profile" "title" )}}</a>
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2023-07-26 18:46:09 +00:00
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</li>
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2023-08-15 20:35:21 +00:00
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{{ if isAdmin -}}
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2023-10-27 14:04:43 +00:00
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<li>
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2023-08-15 20:35:21 +00:00
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<a href="/admin/company">{{( pgettext "Company Settings" "title" )}}</a>
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</li>
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2023-10-27 14:04:43 +00:00
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<li>
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<a href="/admin/payment">{{( pgettext "Payment Settings" "title" )}}</a>
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</li>
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2023-09-25 11:13:19 +00:00
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<li>
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<a href="/admin/campsites/types">{{( pgettext "Campsite Types" "title" )}}</a>
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</li>
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<li>
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<a href="/admin/campsites">{{( pgettext "Campsites" "title" )}}</a>
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</li>
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<li>
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<a href="/admin/seasons">{{( pgettext "Seasons" "title" )}}</a>
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</li>
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<li>
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<a href="/admin/media">{{( pgettext "Media" "title" )}}</a>
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</li>
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<li>
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<a href="/admin/home">{{( pgettext "Home Page" "title" )}}</a>
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</li>
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<li>
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<a href="/admin/services">{{( pgettext "Services Page" "title" )}}</a>
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</li>
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2023-12-21 20:17:04 +00:00
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<li>
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<a href="/admin/location">{{( pgettext "Location" "title" )}}</a>
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</li>
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2023-12-22 01:23:18 +00:00
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<li>
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<a href="/admin/legal">{{( pgettext "Legal Texts" "title" )}}</a>
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</li>
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2023-08-15 20:35:21 +00:00
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{{- end }}
|
2023-08-15 18:52:14 +00:00
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<li class="icon_logout">
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<button data-hx-delete="/me/session" data-hx-headers='{ {{ CSRFHeader }} }'
|
2023-07-26 18:46:09 +00:00
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>{{( pgettext "Logout" "action" )}}</button>
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</li>
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</ul>
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</details>
|
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</nav>
|
Add the logout button
Conceptually, to logout we have to “delete the session”, thus the best
HTTP verb would be `DELETE`. However, there is no way to send a
`DELETE` request with a regular HTML form, and it seems that never will
be[0].
I could use a POST, optionally with a “method override” technique, but
i was planing to use HTMx anyway, so this was as good an opportunity to
include it as any.
In this application i am not concerned with people not having JavaScript
enabled, because it is for a customer that has a known environment, and
we do not have much time anyway. Therefore, i opted to forgo
progressive enhancement in cases like this: if `DELETE` is needed, use
`hx-delete`.
Unfortunately, i can not use a <form> with a hidden <input> for the
CSRF token, because `DELETE` requests do not have body and the value
should be added as query parameters, like a form with GET method, but
HTMx does the incorrect thing here: sends the values in the request’s
body. That’s why i have to use a custom header and the `hx-header`
directive to include the CSRF token.
Then, by default HTMx targets the triggered element for swap with the
response from the server, but after a logout i want to redirect the
user to the login form again. I could set the hx-target to button to
replace the whole body, or tell the client to redirect to the new
location. I actually do not know which one is “better”. Maybe the
hx-target is best because then everything is handled by the client, but
in the case of logout, since it is possible that i might want to load
scripts only for logged-in users in the future, i opted for the full
page reload.
However, HTMx does not want to reload a page that return HTTP 401,
hence i had to include the GET method to /login in order to return the
login form with a response of HTTP 200, which also helps when
reloading in the browser after a failed login attempt. I am not worried
with the HTTP 401 when attempting to load a page as guest, because
this request most probably comes from the browser, not HTMx, and it will
show the login form as intended—even though it is not compliant, since
it does not return the WWW-Authenticate header, but this is the best i
can do given that no cookie-based authentication method has been
accepted[1].
[0]: https://www.w3.org/Bugs/Public/show_bug.cgi?id=10671#c16
[1]: https://datatracker.ietf.org/doc/id/draft-broyer-http-cookie-auth-00.html
2023-07-26 11:49:47 +00:00
|
|
|
{{- end }}
|
Add the skeleton of the web application
It does nothing more than to server a single page that does nothing
interesting.
This time i do not use a router. Instead, i am trying out a technique
i have seen in an article[0] that i have tried in other, smaller,
projects and seems to work surprisingly well: it just “cuts off” the
URI path by path, passing the request from handler to handler until
it finds its way to a handler that actually serves the request.
That helps to loosen the coupling between the application and lower
handlers, and makes dependencies explicit, because i need to pass the
locale, company, etc. down instead of storing them in contexts. Let’s
see if i do not regret it on a later date.
I also made a lot more packages that in Numerus. In Numerus i actually
only have the single pkg package, and it works, kind of, but i notice
how i name my methods to avoid clashing instead of using packages for
that. That is, instead of pkg.NewApp i now have app.New.
Initially i thought that Locale should be inside app, but then there was
a circular dependency between app and template. That is why i created a
separate package, but now i am wondering if template should be inside
app too, but then i would have app.MustRenderTemplate instead of
template.MustRender.
The CSS is the most bare-bones file i could write because i am focusing
in markup right now; Oriol will fill in the file once the application is
working.
[0]: https://blog.merovius.de/posts/2017-06-18-how-not-to-use-an-http-router/
2023-07-22 22:11:00 +00:00
|
|
|
</header>
|
Add the company’s slug in the URL before company-dependent handlers
I really doubt that they are going to use more than a single company,
but the application is based on Numerus, that **does** have multiple
company, and followed the same architecture and philosophy: use the URL
to choose the company to manage, even if the user has a single company.
The reason i use the slug instead of the ID is because i do not want to
make the ID public in case the application is really used by employees
of many unrelated companies: they need not need to guess how many
companies there are based on the ID.
I validate this slug to be a valid UUID instead of relaying on the
query’s empty result because casting a string with a malformed value to
UUID results in an error other than data not found. Not with that
select, but it would fail with a function parameter, and i want to add
that UUID check to all functions that do use slugs.
I based uuid.Valid function on Parse() from Google’s uuid package[0]
instead of using regular expression, as it was my first idea, because
that function is an order of magnitude faster in benchmarks:
goos: linux
goarch: amd64
pkg: dev.tandem.ws/tandem/numerus/pkg
cpu: Intel(R) Core(TM) i5-6200U CPU @ 2.30GHz
BenchmarkValidUuid-4 36946050 29.37 ns/op
BenchmarkValidUuid_Re-4 3633169 306.70 ns/op
The regular expression used for the benchmark was:
var re = regexp.MustCompile("^[a-fA-F0-9]{8}-[a-fA-F0-9]{4}-4[a-fA-F0-9]{3}-[8|9|aA|bB][a-fA-F0-9]{3}-[a-fA-F0-9]{12}$")
And the input parameter for both functions was the following valid UUID,
because most of the time the passed UUID will be valid:
"f47ac10b-58cc-0372-8567-0e02b2c3d479"
I did not use the uuid package as is, even though it is in Debian’s
repository, because i only need to check whether the value is valid,
not convert it to a byte array. As far as i know, that package can not
do that.
Adding the Company struct into auth was not my intention, as it makes
little sense name-wise, but i need to have the Company when rendering
templates and the company package has templates to render, thus using
the company package for the Company struct would create a dependency
loop between template and company. I’ve chosen the auth package only
because User is also there; User and Company are very much related in
this application, but not enough to include the company inside the user,
or vice versa, as the User comes from the cookie while the company from
the URL.
Finally, had to move methodNotAllowed to the http package, as an
exported function, because it is used now from other packages, namely
campsite.
[0]: https://github.com/google/uuid
2023-07-31 16:51:50 +00:00
|
|
|
{{ if isLoggedIn -}}
|
|
|
|
<nav>
|
2023-08-15 18:52:14 +00:00
|
|
|
<ul>
|
|
|
|
<li>
|
|
|
|
<a href="/admin/">{{( pgettext "Dashboard" "title" )}}</a>
|
Add the company’s slug in the URL before company-dependent handlers
I really doubt that they are going to use more than a single company,
but the application is based on Numerus, that **does** have multiple
company, and followed the same architecture and philosophy: use the URL
to choose the company to manage, even if the user has a single company.
The reason i use the slug instead of the ID is because i do not want to
make the ID public in case the application is really used by employees
of many unrelated companies: they need not need to guess how many
companies there are based on the ID.
I validate this slug to be a valid UUID instead of relaying on the
query’s empty result because casting a string with a malformed value to
UUID results in an error other than data not found. Not with that
select, but it would fail with a function parameter, and i want to add
that UUID check to all functions that do use slugs.
I based uuid.Valid function on Parse() from Google’s uuid package[0]
instead of using regular expression, as it was my first idea, because
that function is an order of magnitude faster in benchmarks:
goos: linux
goarch: amd64
pkg: dev.tandem.ws/tandem/numerus/pkg
cpu: Intel(R) Core(TM) i5-6200U CPU @ 2.30GHz
BenchmarkValidUuid-4 36946050 29.37 ns/op
BenchmarkValidUuid_Re-4 3633169 306.70 ns/op
The regular expression used for the benchmark was:
var re = regexp.MustCompile("^[a-fA-F0-9]{8}-[a-fA-F0-9]{4}-4[a-fA-F0-9]{3}-[8|9|aA|bB][a-fA-F0-9]{3}-[a-fA-F0-9]{12}$")
And the input parameter for both functions was the following valid UUID,
because most of the time the passed UUID will be valid:
"f47ac10b-58cc-0372-8567-0e02b2c3d479"
I did not use the uuid package as is, even though it is in Debian’s
repository, because i only need to check whether the value is valid,
not convert it to a byte array. As far as i know, that package can not
do that.
Adding the Company struct into auth was not my intention, as it makes
little sense name-wise, but i need to have the Company when rendering
templates and the company package has templates to render, thus using
the company package for the Company struct would create a dependency
loop between template and company. I’ve chosen the auth package only
because User is also there; User and Company are very much related in
this application, but not enough to include the company inside the user,
or vice versa, as the User comes from the cookie while the company from
the URL.
Finally, had to move methodNotAllowed to the http package, as an
exported function, because it is used now from other packages, namely
campsite.
[0]: https://github.com/google/uuid
2023-07-31 16:51:50 +00:00
|
|
|
</li>
|
2023-09-24 01:18:39 +00:00
|
|
|
<li>
|
|
|
|
<a href="/admin/campsites">{{( pgettext "Campsites" "title" )}}</a>
|
|
|
|
</li>
|
Add the company’s slug in the URL before company-dependent handlers
I really doubt that they are going to use more than a single company,
but the application is based on Numerus, that **does** have multiple
company, and followed the same architecture and philosophy: use the URL
to choose the company to manage, even if the user has a single company.
The reason i use the slug instead of the ID is because i do not want to
make the ID public in case the application is really used by employees
of many unrelated companies: they need not need to guess how many
companies there are based on the ID.
I validate this slug to be a valid UUID instead of relaying on the
query’s empty result because casting a string with a malformed value to
UUID results in an error other than data not found. Not with that
select, but it would fail with a function parameter, and i want to add
that UUID check to all functions that do use slugs.
I based uuid.Valid function on Parse() from Google’s uuid package[0]
instead of using regular expression, as it was my first idea, because
that function is an order of magnitude faster in benchmarks:
goos: linux
goarch: amd64
pkg: dev.tandem.ws/tandem/numerus/pkg
cpu: Intel(R) Core(TM) i5-6200U CPU @ 2.30GHz
BenchmarkValidUuid-4 36946050 29.37 ns/op
BenchmarkValidUuid_Re-4 3633169 306.70 ns/op
The regular expression used for the benchmark was:
var re = regexp.MustCompile("^[a-fA-F0-9]{8}-[a-fA-F0-9]{4}-4[a-fA-F0-9]{3}-[8|9|aA|bB][a-fA-F0-9]{3}-[a-fA-F0-9]{12}$")
And the input parameter for both functions was the following valid UUID,
because most of the time the passed UUID will be valid:
"f47ac10b-58cc-0372-8567-0e02b2c3d479"
I did not use the uuid package as is, even though it is in Debian’s
repository, because i only need to check whether the value is valid,
not convert it to a byte array. As far as i know, that package can not
do that.
Adding the Company struct into auth was not my intention, as it makes
little sense name-wise, but i need to have the Company when rendering
templates and the company package has templates to render, thus using
the company package for the Company struct would create a dependency
loop between template and company. I’ve chosen the auth package only
because User is also there; User and Company are very much related in
this application, but not enough to include the company inside the user,
or vice versa, as the User comes from the cookie while the company from
the URL.
Finally, had to move methodNotAllowed to the http package, as an
exported function, because it is used now from other packages, namely
campsite.
[0]: https://github.com/google/uuid
2023-07-31 16:51:50 +00:00
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</ul>
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</nav>
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{{- end }}
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2023-09-28 00:23:25 +00:00
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<main id="content">
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Add the skeleton of the web application
It does nothing more than to server a single page that does nothing
interesting.
This time i do not use a router. Instead, i am trying out a technique
i have seen in an article[0] that i have tried in other, smaller,
projects and seems to work surprisingly well: it just “cuts off” the
URI path by path, passing the request from handler to handler until
it finds its way to a handler that actually serves the request.
That helps to loosen the coupling between the application and lower
handlers, and makes dependencies explicit, because i need to pass the
locale, company, etc. down instead of storing them in contexts. Let’s
see if i do not regret it on a later date.
I also made a lot more packages that in Numerus. In Numerus i actually
only have the single pkg package, and it works, kind of, but i notice
how i name my methods to avoid clashing instead of using packages for
that. That is, instead of pkg.NewApp i now have app.New.
Initially i thought that Locale should be inside app, but then there was
a circular dependency between app and template. That is why i created a
separate package, but now i am wondering if template should be inside
app too, but then i would have app.MustRenderTemplate instead of
template.MustRender.
The CSS is the most bare-bones file i could write because i am focusing
in markup right now; Oriol will fill in the file once the application is
working.
[0]: https://blog.merovius.de/posts/2017-06-18-how-not-to-use-an-http-router/
2023-07-22 22:11:00 +00:00
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{{- template "content" . }}
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</main>
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</body>
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</html>
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