Jupyterhub stack (#21)

Signed-off-by: omrishiv <327609+omrishiv@users.noreply.github.com>

jupyterhub/README.md

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+# Jupyterhub Stack
+
+This directory contains a Jupyterhub deployment that's integrated with Keycloak
+
+## Caveats
+1) Reliance on `ref-implementation` for SSO
+    - This is possible to work around by setting `authenticator_class` in the `jupyterhub.yaml` to `dummy`.
+
+## Components
+- Jupyterhub
+
+## Installation
+Note: The stack is configured to use Keycloak for SSO; therefore, the ref-implementation is required for this to work.
+
+`idpbuilder create --use-path-routing  -p https://github.com/cnoe-io/stacks//ref-implementation -p https://github.com/cnoe-io/stacks//jupyterhub`
+
+A `jupyterhub-config` job will be deployed into the keycloak namespace to create/patch some of the keycloak components. If deployed at the same time as the `ref-implementation`, this job will fail until the `config` job succeeds. This is normal

jupyterhub/jupyterhub.yaml

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+apiVersion: argoproj.io/v1alpha1
+kind: Application
+metadata:
+  name: jupyterhub
+  namespace: argocd
+  labels:
+    env: dev
+  finalizers:
+    - resources-finalizer.argocd.argoproj.io
+spec:
+  project: default
+  sources:
+    - repoURL: 'https://jupyterhub.github.io/helm-chart/'
+      targetRevision: 3.3.7
+      helm:
+        releaseName: jupyterhub
+        values: |
+          hub:
+            baseUrl: /jupyterhub
+            extraEnv:
+              - name: OAUTH_TLS_VERIFY # for getting around self signed certificate issue
+                value: "0"
+              - name: OAUTH_CLIENT_SECRET
+                valueFrom:
+                  secretKeyRef:
+                    name: jupyterhub-oidc
+                    key: JUPYTERHUB_OAUTH_CLIENT_SECRET
+            config:
+              GenericOAuthenticator:
+                oauth_callback_url: https://cnoe.localtest.me:8443/jupyterhub/hub/oauth_callback
+                client_id: jupyterhub
+                authorize_url: https://cnoe.localtest.me:8443/keycloak/realms/cnoe/protocol/openid-connect/auth
+                token_url: https://cnoe.localtest.me:8443/keycloak/realms/cnoe/protocol/openid-connect/token
+                userdata_url: https://cnoe.localtest.me:8443/keycloak/realms/cnoe/protocol/openid-connect/userinfo
+                scope:
+                  - openid
+                  - profile
+                username_key: "preferred_username"
+                login_service: "keycloak"
+                allow_all: true # Allows all oauth authenticated users to use Jupyterhub. For finer grained control, you can use `allowed_users`: https://jupyterhub.readthedocs.io/en/stable/tutorial/getting-started/authenticators-users-basics.html#deciding-who-is-allowed
+              JupyterHub:
+                authenticator_class: generic-oauth
+      chart: jupyterhub
+    - repoURL: cnoe://jupyterhub
+      targetRevision: HEAD
+      path: "manifests"
+  destination:
+    server: "https://kubernetes.default.svc"
+    namespace: jupyterhub
+  syncPolicy:
+    syncOptions:
+      - CreateNamespace=true
+    automated:
+      selfHeal: true

jupyterhub/jupyterhub/manifests/jupyterhub-config.yaml

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+---
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: jupyterhub-config-job
+  namespace: keycloak
+data:
+  jupyterhub-client-payload.json: |
+    {
+      "protocol": "openid-connect",
+      "clientId": "jupyterhub",
+      "name": "Jupyterhub Client",
+      "description": "Used for Jupyterhub SSO",
+      "publicClient": false,
+      "authorizationServicesEnabled": false,
+      "serviceAccountsEnabled": false,
+      "implicitFlowEnabled": false,
+      "directAccessGrantsEnabled": true,
+      "standardFlowEnabled": true,
+      "frontchannelLogout": true,
+      "attributes": {
+        "saml_idp_initiated_sso_url_name": "",
+        "oauth2.device.authorization.grant.enabled": false,
+        "oidc.ciba.grant.enabled": false
+      },
+      "alwaysDisplayInConsole": false,
+      "rootUrl": "",
+      "baseUrl": "",
+      "redirectUris": [
+        "https://cnoe.localtest.me:8443/jupyterhub/hub/oauth_callback"
+      ],
+      "webOrigins": [
+        "/*"
+      ]
+    }
+---
+apiVersion: batch/v1
+kind: Job
+metadata:
+  name: jupyterhub-config
+  namespace: keycloak
+spec:
+  template:
+    metadata:
+      generateName: jupyterhub-config
+    spec:
+      serviceAccountName: keycloak-config
+      restartPolicy: Never
+      volumes:
+        - name: keycloak-config
+          secret:
+            secretName: keycloak-config
+        - name: config-payloads
+          configMap:
+            name: jupyterhub-config-job
+      containers:
+        - name: kubectl
+          image: docker.io/library/ubuntu:22.04
+          volumeMounts:
+            - name: keycloak-config
+              readOnly: true
+              mountPath: "/var/secrets/"
+            - name: config-payloads
+              readOnly: true
+              mountPath: "/var/config/"
+          command: ["/bin/bash", "-c"]
+          args:
+            - |
+              #! /bin/bash
+              set -ex -o pipefail
+              apt -qq update && apt -qq install curl jq gettext-base -y
+              
+              curl -sS -LO "https://dl.k8s.io/release/v1.28.3//bin/linux/amd64/kubectl"
+              chmod +x kubectl
+              
+              echo "checking if we're ready to start"
+              set +e
+              ./kubectl get secret -n keycloak keycloak-clients &> /dev/null
+              if [ $? -ne 0 ]; then
+                exit 1
+              fi
+              set -e
+              
+              ADMIN_PASSWORD=$(cat /var/secrets/KEYCLOAK_ADMIN_PASSWORD)
+              KEYCLOAK_URL=http://keycloak.keycloak.svc.cluster.local:8080/keycloak
+              KEYCLOAK_TOKEN=$(curl -sS  --fail-with-body -X POST -H "Content-Type: application/x-www-form-urlencoded" \
+                --data-urlencode "username=cnoe-admin" \
+                --data-urlencode "password=${ADMIN_PASSWORD}" \
+                --data-urlencode "grant_type=password" \
+                --data-urlencode "client_id=admin-cli" \
+                ${KEYCLOAK_URL}/realms/master/protocol/openid-connect/token | jq -e -r '.access_token')
+              
+              set +e
+              
+              curl --fail-with-body -H "Authorization: bearer ${KEYCLOAK_TOKEN}"  "${KEYCLOAK_URL}/admin/realms/cnoe"  &> /dev/null
+              if [ $? -ne 0 ]; then
+                exit 0
+              fi
+              set -e
+              
+              echo "creating Jupyterhub client"
+              curl -sS -H "Content-Type: application/json" \
+                -H "Authorization: bearer ${KEYCLOAK_TOKEN}" \
+                -X POST --data @/var/config/jupyterhub-client-payload.json \
+                  ${KEYCLOAK_URL}/admin/realms/cnoe/clients
+              
+              CLIENT_ID=$(curl -sS -H "Content-Type: application/json" \
+                -H "Authorization: bearer ${KEYCLOAK_TOKEN}" \
+                -X GET ${KEYCLOAK_URL}/admin/realms/cnoe/clients | jq -e -r  '.[] | select(.clientId == "jupyterhub") | .id')
+              
+              CLIENT_SCOPE_GROUPS_ID=$(curl -sS -H "Content-Type: application/json" -H "Authorization: bearer ${KEYCLOAK_TOKEN}" -X GET  ${KEYCLOAK_URL}/admin/realms/cnoe/client-scopes | jq -e -r  '.[] | select(.name == "groups") | .id')
+              curl -sS -H "Content-Type: application/json" -H "Authorization: bearer ${KEYCLOAK_TOKEN}" -X PUT  ${KEYCLOAK_URL}/admin/realms/cnoe/clients/${CLIENT_ID}/default-client-scopes/${CLIENT_SCOPE_GROUPS_ID}
+              
+              JUPYTERHUB_CLIENT_SECRET=$(curl -sS -H "Content-Type: application/json" \
+                -H "Authorization: bearer ${KEYCLOAK_TOKEN}" \
+                -X GET ${KEYCLOAK_URL}/admin/realms/cnoe/clients/${CLIENT_ID} | jq -e -r '.secret')
+              
+              ./kubectl patch secret -n keycloak keycloak-clients --type=json \
+                -p='[{
+                "op" : "add" ,
+                "path" : "/data/JUPYTERHUB_CLIENT_SECRET" ,
+                "value" : "'$(echo -n "$JUPYTERHUB_CLIENT_SECRET" | base64 -w 0)'"
+                },{
+                  "op" : "add" ,
+                  "path" : "/data/JUPYTERHUB_CLIENT_ID" ,
+                  "value" : "'$(echo -n "jupyterhub" | base64 -w 0)'"
+                }]'

jupyterhub/jupyterhub/manifests/jupyterhub-external-secrets.yaml

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+apiVersion: external-secrets.io/v1beta1
+kind: ExternalSecret
+metadata:
+  name: keycloak-oidc
+  namespace: jupyterhub
+spec:
+  secretStoreRef:
+    name: keycloak
+    kind: ClusterSecretStore
+  target:
+    name: jupyterhub-oidc
+  data:
+    - secretKey: JUPYTERHUB_OAUTH_CLIENT_ID
+      remoteRef:
+        key: keycloak-clients
+        property: JUPYTERHUB_CLIENT_ID
+    - secretKey: JUPYTERHUB_OAUTH_CLIENT_SECRET
+      remoteRef:
+        key: keycloak-clients
+        property: JUPYTERHUB_CLIENT_SECRET

jupyterhub/jupyterhub/manifests/jupyterhub-ingress.yaml

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+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: jupyterhub-ingress
+  namespace: jupyterhub
+  annotations:
+    nginx.ingress.kubernetes.io/backend-protocol: HTTP
+    nginx.ingress.kubernetes.io/rewrite-target: /jupyterhub/$2
+    nginx.ingress.kubernetes.io/use-regex: 'true'
+spec:
+  ingressClassName: nginx
+  rules:
+    - host: cnoe.localtest.me
+      http:
+        paths:
+          - path: /jupyterhub(/|$)(.*)
+            pathType: ImplementationSpecific
+            backend:
+              service:
+                name: proxy-public
+                port:
+                  number: 80
+    - host: localhost
+      http:
+        paths:
+          - path: /jupyterhub(/|$)(.*)
+            pathType: ImplementationSpecific
+            backend:
+              service:
+                name: proxy-public
+                port:
+                  number: 80