* web: weightloss program, part 1: FlowSearch
This commit extracts the multiple uses of SearchSelect for Flow lookups in the `providers`
collection and replaces them with a slightly more legible format, from:
```HTML
<ak-search-select
.fetchObjects=${async (query?: string): Promise<Flow[]> => {
const args: FlowsInstancesListRequest = {
ordering: "slug",
designation: FlowsInstancesListDesignationEnum.Authentication,
};
if (query !== undefined) {
args.search = query;
}
const flows = await new FlowsApi(DEFAULT_CONFIG).flowsInstancesList(args);
return flows.results;
}}
.renderElement=${(flow: Flow): string => {
return RenderFlowOption(flow);
}}
.renderDescription=${(flow: Flow): TemplateResult => {
return html`${flow.name}`;
}}
.value=${(flow: Flow | undefined): string | undefined => {
return flow?.pk;
}}
.selected=${(flow: Flow): boolean => {
return flow.pk === this.instance?.authenticationFlow;
}}
>
</ak-search-select>
```
... to:
```HTML
<ak-flow-search
flowType=${FlowsInstancesListDesignationEnum.Authentication}
.currentFlow=${this.instance?.authenticationFlow}
required
></ak-flow-search>
```
All of those middle methods, like `renderElement`, `renderDescription`, etc, are *completely the
same* for *all* of the searches, and there are something like 25 of them; this commit only covers
the 8 in `providers`, but the next commit should carry all of them.
The topmost example has been extracted into its own Web Component, `ak-flow-search`, that takes only
two arguments: the type of `FlowInstanceListDesignation` and the current instance of the flow.
The static methods for `renderElement`, `renderDescription` and `value` (which are all the same in
all 25 instances of `FlowInstancesListRequest`) have been made into standalone functions.
`fetchObjects` has been made into a method that takes the parameter from the `designation` property,
and `selected` has been turned into a method that takes the comparator instance from the
`currentFlow` property. That's it. That's the whole of it.
`SearchSelect` now emits an event whenever the user changes the field, and `ak-flow-search`
intercepts that event to mirror the value locally.
`Form` has been adapted to recognize the `ak-flow-search` element and extract the current value.
There are a number of legibility issues remaining, even with this fix. The Authentik Form manager
is dependent upon a component named `ak-form-element-horizontal`, which is a container for a single
displayed element in a form:
```HTML
<ak-form-element-horizontal
label=${msg("Authorization flow")}
?required=${true}
name="authorizationFlow"
>
<ak-flow-search
flowType=${FlowsInstancesListDesignationEnum.Authorization}
.currentFlow=${this.instance?.authorizationFlow}
required
></ak-flow-search>
<p class="pf-c-form__helper-text">
${msg("Flow used when authorizing this provider.")}
</p>
</ak-form-element-horizontal>
```
Imagine, instead, if we could write:
```HTML
<ak-form-element-flow-search
flowType=${FlowsInstancesListDesignationEnum.Authorization}
.currentFlow=${this.instance?.authorizationFlow}
required
name="authorizationFlow">
<label slot="label">${msg("Authorization flow")}</label>
<span slot="help">${msg("Flow used when authorizing this provider.")}</span>
<ak-form-element-flow-search>
```
Starting with a superclass that understands the need for `label` and `help` slots, it would
automatically configure the input object that would be used. We've already specified multiple
identical copies of this thing in multiple different places; centralizing their definition and then
re-using them would be classic code re-use.
Even better, since the Authorization flow is used 10 times in the whole of our code base, and the
Authentication flow 8 times, and they are *all identical*, it would be fitting if we just created
wrappers:
```HTML
<ak-form-element-flow-search
flowType=${FlowsInstancesListDesignationEnum.Authorization}>
<ak-form-element-flow-search>
```
That's really all that's needed. There are *hundreds* (about 470 total) cases where nine or more
lines of repetitious HTML could be replaced with a one-liner like the above.
A "narrow waist" design is one that allows for a system to communicate between two different
components through a small but consistent collection of calls. The Form manager needs to be narrowed
hard. The `ak-form-element-horizontal` is a wrapper around an input object, and it has this at its
core for extracting that information. This forwards the name component to the containing input
object so that when the input object generates an event, we can identify the field it's associated
with.
```Javascript
this.querySelectorAll("*").forEach((input) => {
switch (input.tagName.toLowerCase()) {
case "input":
case "textarea":
case "select":
case "ak-codemirror":
case "ak-chip-group":
case "ak-search-select":
case "ak-radio":
input.setAttribute("name", this.name);
break;
default:
return;
}
```
A *temporary* variant of this is in the `ak-flow-search` component, to support this API without
having to modify `ak-form-element-horizontal`.
And then `ak-form` itself has this:
```Javascript
if (
inputElement.tagName.toLowerCase() === "select" &&
"multiple" in inputElement.attributes
) {
const selectElement = inputElement as unknown as HTMLSelectElement;
json[element.name] = Array.from(selectElement.selectedOptions).map((v) => v.value);
} else if (
inputElement.tagName.toLowerCase() === "input" &&
inputElement.type === "date"
) {
json[element.name] = inputElement.valueAsDate;
} else if (
inputElement.tagName.toLowerCase() === "input" &&
inputElement.type === "datetime-local"
) {
json[element.name] = new Date(inputElement.valueAsNumber);
}
// ... another 20 lines removed
```
This ought to read:
```Javascript
const json = elements.filter((element => element instanceof AkFormComponent)
.reduce((acc, element) => ({ ...acc, [element.name]: element.value] });
```
Where, instead of hand-writing all the different input objects for date and datetime and checkbox
into our forms, and then having to craft custom value extractors for each and every one of them,
just write *one* version of each with all the wrappers and bells and whistles already attached, and
have each one of them have a `value` getter descriptor that returns the value expected by our form
handler.
A back-of-the-envelope estimation is that there's about four *thousand* lines that could disappear
if we did this right.
More importantly, it would be possible to create new `AkFormComponent`s without having to register
them or define them for `ak-form`; as long as they conformed to the AkFormComponent's expectations
for "what is a source of values for a Form", `ak-form` would understand how to handle it.
Ultimately, what I want is to be able to do this:
``` HTML
<ak-input-form
itemtype="ak-search"
itemid="ak-authentication"
itemprop=${this.instance}></ak-inputform>
```
And it will (1) go out and find the right kind of search to put there, (2) conduct the right kind of
fetch to fill that search, (3) pre-configure it with the user's current choice in that locale.
I don't think this is possible-- for one thing, it would be very expensive in terms of development,
and it may break the "narrow waist" ideal by require that the `ak-input-form` object know all the
different kinds of searches that are available. The old Midgardian dream was that the object would
have *just* the identity triple (A table, a row of that table, a field of that row), and the
Javascript would go out and, using the identity, *find* the right object for CRUD (Creating,
Retrieving, Updating, and Deleting) it.
But that inspiration, as unreachable as it is, is where I'm headed. Where our objects are both
*smart* and *standalone*. Where they're polite citizens in an ordered universe, capable of
independence sufficient to be tested and validated and trusted, but working in concert to achieve
our aims.
* web: unravel the search-select for flows completely.
This commit removes *all* instances of the search-select
for flows, classifying them into four different categories:
- a search with no default
- a search with a default
- a search with a default and a fallback to a static default if non specified
- a search with a default and a fallback to the tenant's preferred default if this is a new instance
and no flow specified.
It's not humanly possible to test all the instances where this has been committed, but the linters
are very happy with the results, and I'm going to eyeball every one of them in the github
presentation before I move this out of draft.
* web: several were declared 'required' that were not.
* web: I can't believe this was rejected because of a misspelling in a code comment. Well done\!
* web: another codespell fix for a comment.
* web: adding 'codespell' to the pre-commit command. Fixed spelling error in eventEmitter.
3f02534eb1