{{/*
HTTPRoute - the Gateway-API alternative to ytdlp-web-player.ingress.yaml
(Gitea #114).

READ THE SUBCHART PARAGRAPH FIRST, because it decides whether this mode is
useful at all for a given installation.

THE oauth2-proxy SUBCHART HAS NO GATEWAY SUPPORT, AND THIS CHART CANNOT GIVE
IT ONE. Upstream's chart is consumed as it comes - that is the standing rule
for dependencies (README, "Chart dependencies"): where its defaults fall short
of this repository's conventions, the shortfall is DOCUMENTED and never
patched. It renders an Ingress or nothing.

So in the RECOMMENDED configuration - oauth2-proxy.enabled true, the proxy in
the data path, the proxy owning the host and this chart's own routing object
switched off - the object that publishes the release is the SUBCHART'S
INGRESS, in both of this chart's modes. Setting httpRoute.enabled there buys
nothing and changes nothing about how the host is served. This route is for
the other two cases:

  - the proxy switched off entirely (oauth2-proxy.enabled false), the chart
    publishing the application itself;
  - the application on a host of ITS OWN, next to the proxy's host - which is
    allowed and means exactly what it says: an unauthenticated way past the
    proxy. NOTES.txt says so in both modes.

AND THAT SECOND CASE IS WHY THE HOST GUARD CHANGED. ytdlp-web-player.validate
used to ask ingress.enabled, which is false by construction in this mode, so
the guard went silent exactly where it matters most. It now asks
ytdlp-web-player.published (ingress.enabled OR httpRoute.enabled). The
difference is not cosmetic: in Ingress mode a host claimed twice is rejected
LOUDLY by ingress-nginx's admission webhook, while in Gateway mode the webhook
never fires - it compares Ingress objects with Ingress objects, and an
HTTPRoute is a different kind. Two valid objects then serve one hostname over
two data paths, one through authentication and one straight to the
application, and which one a client reaches depends on DNS. See the helper's
comment for the full argument.

WHAT THIS RENDERS, AND WHAT IT MUST NOT

Only an HTTPRoute with parentRefs. No Gateway, no gatewayClassName, no
Certificate, no implementation-specific policy object - the subset that looks
identical on nginx-gateway-fabric, Cilium, Envoy Gateway and Istio (decision 1
of #114). Class and certificate belong to the PLATFORM, on the Gateway and its
listeners, in cluster-config.

WHAT THIS MODE DROPS, AND WHAT IT DOES NOT

ingress.annotations is inert here - no annotation channel in the Gateway API.
For this chart the measured picture is unusual, so it is worth being exact
about which annotation lives where:

  - The 16k proxy-buffer-size this chart's values recommend is NOT on this
    chart's Ingress. It belongs on the PROXY's Ingress
    (oauth2-proxy.ingress.annotations), because it is the second half of the
    4kB session-cookie trap: the response carrying the proxy's session cookie
    does not fit ingress-nginx's default 4k buffer and the browser gets a 502
    AFTER a successful login. The subchart still renders an Ingress in this
    mode, so that annotation is UNAFFECTED by this switch. It would only be
    lost if the proxy itself ever moved behind a Gateway, which this chart
    cannot do.
  - This chart's own ingress.annotations default is {} and the chart sets
    nothing but the cert-manager annotation, so there is no chart-side loss to
    name.

NOTHING WAS MEASURED ON A LIVE INGRESS OF THIS CHART, because there is none.
Checked on 2026-10-12: the release runs in namespace jlab-player (Services
jlab-player-ytdlp-web-player-service and jlab-player-oauth2-proxy, both
Deployments Ready) and NOT ONE of the 23 Ingress objects in the cluster is in
that namespace - neither this chart's nor the subchart's. What publishes it
instead could NOT be determined: this workspace's identity may not list
httproutes or secrets, so neither a hand-written HTTPRoute nor the release's
own Helm values are readable. Stated as the open question it is, rather than
guessed at.
*/}}
{{- /*
Null-safe like every other block a template here dereferences (#99): an
override written without children - "httpRoute:" with its keys deleted - is
YAML null, and .Values.httpRoute.enabled would abort with a nil pointer.
*/ -}}
{{- $httpRoute := .Values.httpRoute | default dict -}}
{{- if and $httpRoute.enabled .Values.ingress.enabled -}}
{{- fail "ingress.enabled and httpRoute.enabled are both true - set exactly one of them. The Ingress and the HTTPRoute would publish the same Service under the same hostname over two different data paths, which is already a conflict at DNS level: one name, two addresses, and which one a client reaches is luck. ingress.enabled defaults to TRUE in this chart, so turning the Gateway mode on means setting ingress.enabled: false in the same values file. A migration runs over a SECOND hostname (set httpRoute.hostnames explicitly while the Ingress keeps ingress.domain), never over parallel operation of both - and if the oauth2-proxy subchart is in the data path, mind that it has no Gateway support and publishes over an Ingress regardless." -}}
{{- end -}}
{{- if $httpRoute.enabled -}}
{{- include "ytdlp-web-player.validate" . -}}
{{- $parentRefs := $httpRoute.parentRefs | default list -}}
{{- if not $parentRefs -}}
{{- fail "httpRoute.enabled is true but httpRoute.parentRefs is empty - an HTTPRoute without a parent attaches to no Gateway. It is created, it is schema-valid, and it routes NOTHING, with no event and no condition that says so; the only symptom is a hostname that does not answer. Name the cluster's Gateway, e.g. httpRoute.parentRefs: [{name: public, namespace: gateway}]." -}}
{{- end -}}
{{- /*
One source of truth for the hostname: an empty httpRoute.hostnames means
[ingress.domain]. Two values that have to agree drift apart.

AND THIS READ CHANGES THE CHART'S OWN ACCOUNT OF ITSELF. values.yaml and the
schema both stated that everything the Ingress needs is read only inside the
Ingress template, which is why switching it off freed BOTH ingress.domain and
ingress.clusterIssuer. The second half still holds - the application has no
base-URL setting and builds no absolute links, so it needs no hostname of its
own - but ingress.domain is now read HERE as well. Both have been corrected
rather than left standing. clusterIssuer is still freed by this mode: no
Certificate is rendered.
*/ -}}
{{- $hostnames := $httpRoute.hostnames | default list -}}
{{- if not $hostnames -}}
{{- $hostnames = list (required "A Domain/Host must be provided: set ingress.domain (used as the HTTPRoute's single hostname when httpRoute.hostnames is empty) or set httpRoute.hostnames explicitly" .Values.ingress.domain) -}}
{{- end -}}
apiVersion: gateway.networking.k8s.io/v1
kind: HTTPRoute
metadata:
  name: {{ .Release.Name }}-{{ .Chart.Name }}-httproute
spec:
  parentRefs:
    {{- toYaml $parentRefs | nindent 4 }}
  hostnames:
    {{- toYaml $hostnames | nindent 4 }}
  rules:
      {{- /*
      The Ingress counterpart is `path: / , pathType: Prefix` on the
      application Service. The port is the Service's port NUMBER and not its
      name "http": backendRefs takes a PortNumber, so unlike the Ingress this
      reference cannot be made by name. 80 is what the Service publishes (and
      what ytdlp-web-player.appServiceAddress hands the proxy as its
      upstream), so the three agree; ci/run-httproute-match-test.sh holds the
      pair for the case where they stop agreeing.
      */}}
    - matches:
        - path:
            type: PathPrefix
            value: /
      backendRefs:
        - name: {{ .Release.Name }}-{{ .Chart.Name }}-service
          port: 80
{{- end }}