Add passwords generation to ClickHouse (#332)

Signed-off-by: Andrei Kvapil <kvapss@gmail.com>


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

- **New Features**
- Updated Clickhouse application to version 0.4.0, indicating new
enhancements.
- Improved user credential management by dynamically generating
passwords or using provided ones, enhancing security.
- Introduced a new Kubernetes Role for managing access to services and
secrets, ensuring better control over resource interactions.

- **Bug Fixes**
- Corrected the reference for accessing the storage class value to
ensure proper retrieval.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Signed-off-by: Andrei Kvapil <kvapss@gmail.com>

packages/apps/clickhouse/Chart.yaml

@@ -16,7 +16,7 @@ type: application
 # This is the chart version. This version number should be incremented each time you make changes
 # to the chart and its templates, including the app version.
 # Versions are expected to follow Semantic Versioning (https://semver.org/)
-version: 0.3.0
+version: 0.4.0
 
 # This is the version number of the application being deployed. This version number should be
 # incremented each time you make changes to the application. Versions are not expected to

packages/apps/clickhouse/templates/clickhouse.yaml

@@ -1,3 +1,32 @@
+{{- $existingSecret := lookup "v1" "Secret" .Release.Namespace (printf "%s-credentials" .Release.Name) }}
+{{- $passwords := dict }}
+
+{{- with (index $existingSecret "data") }}
+  {{- range $k, $v := . }}
+    {{- $_ := set $passwords $k (b64dec $v) }}
+  {{- end }}
+{{- end }}
+
+{{- range $user, $u := .Values.users }}
+  {{- if $u.password }}
+    {{- $_ := set $passwords $user $u.password }}
+  {{- else if not (index $passwords $user) }}
+    {{- $_ := set $passwords $user (randAlphaNum 16) }}
+  {{- end }}
+{{- end }}
+
+{{- if .Values.users }}
+apiVersion: v1
+kind: Secret
+metadata:
+  name: {{ .Release.Name }}-credentials
+stringData:
+  {{- range $user, $u := .Values.users }}
+  {{ quote $user }}: {{ quote (index $passwords $user) }}
+  {{- end }}
+{{- end }}
+
+---
 apiVersion: "clickhouse.altinity.com/v1"
 kind: "ClickHouseInstallation"
 metadata:
@@ -12,7 +41,7 @@ spec:
     {{- with .Values.users }}
     users:
       {{- range $name, $u := . }}
-      {{ $name }}/password_sha256_hex: {{ sha256sum $u.password }}
+      {{ $name }}/password_sha256_hex: {{ sha256sum (index $passwords $name) }}
       {{ $name }}/profile: {{ ternary "readonly" "default" (index $u "readonly" | default false) }}
       {{ $name }}/networks/ip: ["::/0"]
       {{- end }}
@@ -31,7 +60,7 @@ spec:
         spec:
           accessModes:
             - ReadWriteOnce
-          {{- with .Values.storageClass }}
+          {{- with $.Values.storageClass }}
           storageClassName: {{ . }}
           {{- end }}
           resources:

packages/apps/clickhouse/templates/dashboard-resourcemap.yaml

@@ -0,0 +1,19 @@
+apiVersion: rbac.authorization.k8s.io/v1
+kind: Role
+metadata:
+  name: {{ .Release.Name }}-dashboard-resources
+rules:
+- apiGroups:
+  - ""
+  resources:
+  - services
+  resourceNames:
+  - chi-clickhouse-test-clickhouse-0-0
+  verbs: ["get", "list", "watch"]
+- apiGroups:
+  - ""
+  resources:
+  - secrets
+  resourceNames:
+  - {{ .Release.Name }}-credentials
+  verbs: ["get", "list", "watch"]