chore(infra): point cloud relay at shared cluster MinIO

Drop the standalone MinIO StatefulSet — the cluster already runs one
in the `minio` namespace, exposed at minio.arthurbarre.fr. Use that
with a scoped anydrop user + bucket instead of spinning up a second
instance.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

k8s/minio.yml

@@ -1,138 +0,0 @@
-# MinIO — S3-compatible object storage for the encrypted relay.
-#
-# Phase 2 context: the server never sees plaintext. Clients upload an
-# XChaCha20-Poly1305 ciphertext directly to MinIO via a presigned PUT URL,
-# and recipients download via a presigned GET URL. The symmetric key stays
-# in the browser URL fragment (#k=...); the server only knows the storage
-# key and blob size.
-#
-# Single-node deployment in-cluster. Bucket "transfers" is created on boot
-# via a one-shot initContainer (mc mb --ignore-existing).
-#
-# DEPLOY-TIME REQUIREMENT: the API port (9000) must be publicly reachable at
-# the host declared by S3_ENDPOINT in server.yml (s3.anydrop.arthurbarre.fr).
-# Presigned URLs are signed against that host, and the browser must be able
-# to resolve it. Configure an external route (traefik ingress, nginx, etc.)
-# from that hostname to this Service on port 9000.
-
-apiVersion: v1
-kind: Service
-metadata:
-  name: minio
-  namespace: anydrop
-  labels:
-    app: minio
-spec:
-  clusterIP: None
-  selector:
-    app: minio
-  ports:
-    - name: api
-      port: 9000
-      targetPort: 9000
-    - name: console
-      port: 9001
-      targetPort: 9001
-
----
-apiVersion: apps/v1
-kind: StatefulSet
-metadata:
-  name: minio
-  namespace: anydrop
-spec:
-  serviceName: minio
-  replicas: 1
-  selector:
-    matchLabels:
-      app: minio
-  template:
-    metadata:
-      labels:
-        app: minio
-    spec:
-      initContainers:
-        - name: ensure-bucket
-          image: minio/mc:latest
-          command:
-            - /bin/sh
-            - -c
-            - |
-              set -e
-              until mc alias set local http://minio:9000 "$MINIO_ROOT_USER" "$MINIO_ROOT_PASSWORD" 2>/dev/null; do
-                echo "waiting for minio..."
-                sleep 2
-              done
-              mc mb --ignore-existing local/transfers
-              # Keep the bucket private — every object is served via presigned URL.
-              mc anonymous set none local/transfers
-              echo "bucket ready"
-          env:
-            - name: MINIO_ROOT_USER
-              valueFrom:
-                secretKeyRef:
-                  name: minio-credentials
-                  key: access_key
-            - name: MINIO_ROOT_PASSWORD
-              valueFrom:
-                secretKeyRef:
-                  name: minio-credentials
-                  key: secret_key
-      containers:
-        - name: minio
-          image: minio/minio:latest
-          args:
-            - server
-            - /data
-            - --console-address
-            - ":9001"
-          ports:
-            - containerPort: 9000
-              name: api
-            - containerPort: 9001
-              name: console
-          env:
-            - name: MINIO_ROOT_USER
-              valueFrom:
-                secretKeyRef:
-                  name: minio-credentials
-                  key: access_key
-            - name: MINIO_ROOT_PASSWORD
-              valueFrom:
-                secretKeyRef:
-                  name: minio-credentials
-                  key: secret_key
-            - name: MINIO_BROWSER_REDIRECT_URL
-              value: "https://anydrop.arthurbarre.fr/minio-console"
-          volumeMounts:
-            - name: data
-              mountPath: /data
-          livenessProbe:
-            httpGet:
-              path: /minio/health/live
-              port: 9000
-            initialDelaySeconds: 30
-            periodSeconds: 20
-            timeoutSeconds: 5
-          readinessProbe:
-            httpGet:
-              path: /minio/health/ready
-              port: 9000
-            initialDelaySeconds: 5
-            periodSeconds: 10
-            timeoutSeconds: 3
-          resources:
-            requests:
-              memory: "256Mi"
-              cpu: "100m"
-            limits:
-              memory: "1Gi"
-              cpu: "1000m"
-  volumeClaimTemplates:
-    - metadata:
-        name: data
-      spec:
-        accessModes: ["ReadWriteOnce"]
-        resources:
-          requests:
-            storage: 20Gi

k8s/secrets.example.yml

@@ -16,12 +16,19 @@
 #     --from-literal=SESSION_SECRET="$SESSION_SECRET" \
 #     --from-literal=DATABASE_URL="$DATABASE_URL"
 #
-#   # MinIO (object storage for the encrypted relay)
-#   MINIO_ACCESS_KEY=$(openssl rand -hex 16)
-#   MINIO_SECRET_KEY=$(openssl rand -base64 40 | tr -d '=+/')
+#   # MinIO — reuses the shared cluster MinIO in the `minio` namespace.
+#   # Create a scoped user + policy on MinIO (one-shot), then store its
+#   # credentials here. Don't use the MinIO root account.
+#   #   kubectl -n minio exec deploy/minio -- sh -c '
+#   #     mc alias set local http://localhost:9000 "$MINIO_ROOT_USER" "$MINIO_ROOT_PASSWORD"
+#   #     mc mb --ignore-existing local/transfers
+#   #     mc anonymous set none local/transfers
+#   #     mc admin user add local anydrop <STRONG_SECRET>
+#   #     # Attach a policy scoped to the transfers bucket only.
+#   #   '
 #   kubectl -n anydrop create secret generic minio-credentials \
-#     --from-literal=access_key="$MINIO_ACCESS_KEY" \
-#     --from-literal=secret_key="$MINIO_SECRET_KEY"
+#     --from-literal=access_key="anydrop" \
+#     --from-literal=secret_key="<STRONG_SECRET>"
 #
 # Rotate by replacing the secret and restarting the pods:
 #   kubectl -n anydrop rollout restart deployment/anydrop-server

k8s/server.yml

@@ -15,11 +15,11 @@ data:
   SMTP_SECURE: "false"
   SMTP_TLS_REJECT_UNAUTHORIZED: "false"
   SMTP_FROM: "AnyDrop <noreply@anydrop.arthurbarre.fr>"
-  # Phase 2 — encrypted cloud relay (MinIO in-cluster)
-  # Endpoint must be publicly reachable: the browser uses presigned URLs
-  # signed against this host, so the hostname seen by the server and the
-  # client must match. Ingress routes s3.anydrop.arthurbarre.fr → minio:9000.
-  S3_ENDPOINT: "https://s3.anydrop.arthurbarre.fr"
+  # Phase 2 — encrypted cloud relay (shared MinIO in the `minio` namespace,
+  # exposed publicly via Traefik as minio.arthurbarre.fr). The browser uses
+  # presigned URLs signed against this host, so server and client must see
+  # the same hostname.
+  S3_ENDPOINT: "https://minio.arthurbarre.fr"
   S3_REGION: "us-east-1"
   S3_BUCKET: "transfers"
   S3_FORCE_PATH_STYLE: "true"