Repository: owncloud/ocis
Pull request #8419 (2024-02-09 10:07:38)

make store service configurable
The store service was born out of a misunderstanding ... we need to clean that up. This PR changes the default signing key store to nats, but allows configuring and using the old store service to running existing installations without changes to the deployment (if updating the configuratin).

The change does not need a migration as signing keys are just regenerated on the fly.

I don't know if the web ui will re download the signing key if it expired. I don't think it has a way of detecting that as the browser will handle the download. Maybe they should just forget the signing key ... every 5min? so it is periodically refetched?

I can see the ocis web ui being left open for a long time, so I set the new signing key TTL default to 12h. In the past it never expired, which IMO is a pad practice.

cc @mmattel @wkloucek @kobergj @kulmann 

update-docs[bot]: Thanks for opening this pull request! The maintainers of this repository would appreciate it if you would create a [changelog](https://github.com/owncloud/ocis/blob/master/changelog/README.md) item based on your changes.

mmattel: Removing the store service is great, as it reduces the list of services not having a description about their purpose 🤣 @kobergj 
sonarcloud[bot]: ## [![Quality Gate Passed](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/QualityGateBadge/qg-passed-20px.png 'Quality Gate Passed')](https://sonarcloud.io/dashboard?id=owncloud_ocis&pullRequest=8419) **Quality Gate passed**  
Issues  
![](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/passed-16px.png '') [0 New issues](https://sonarcloud.io/project/issues?id=owncloud_ocis&pullRequest=8419&resolved=false&inNewCodePeriod=true)

Measures  
![](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/passed-16px.png '') [0 Security Hotspots](https://sonarcloud.io/project/security_hotspots?id=owncloud_ocis&pullRequest=8419&resolved=false&inNewCodePeriod=true)  
![](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/passed-16px.png '') [0.0% Coverage on New Code](https://sonarcloud.io/component_measures?id=owncloud_ocis&pullRequest=8419&metric=new_coverage&view=list)  
![](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/passed-16px.png '') [0.9% Duplication on New Code](https://sonarcloud.io/component_measures?id=owncloud_ocis&pullRequest=8419&metric=new_duplicated_lines_density&view=list)  
  
[See analysis details on SonarCloud](https://sonarcloud.io/dashboard?id=owncloud_ocis&pullRequest=8419)


sonarcloud[bot]: ## [![Quality Gate Passed](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/QualityGateBadge/qg-passed-20px.png 'Quality Gate Passed')](https://sonarcloud.io/dashboard?id=owncloud_ocis&pullRequest=8419) **Quality Gate passed**  
Issues  
![](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/passed-16px.png '') [0 New issues](https://sonarcloud.io/project/issues?id=owncloud_ocis&pullRequest=8419&resolved=false&inNewCodePeriod=true)

Measures  
![](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/passed-16px.png '') [0 Security Hotspots](https://sonarcloud.io/project/security_hotspots?id=owncloud_ocis&pullRequest=8419&resolved=false&inNewCodePeriod=true)  
![](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/passed-16px.png '') [0.0% Coverage on New Code](https://sonarcloud.io/component_measures?id=owncloud_ocis&pullRequest=8419&metric=new_coverage&view=list)  
![](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/passed-16px.png '') [0.9% Duplication on New Code](https://sonarcloud.io/component_measures?id=owncloud_ocis&pullRequest=8419&metric=new_duplicated_lines_density&view=list)  
  
[See analysis details on SonarCloud](https://sonarcloud.io/dashboard?id=owncloud_ocis&pullRequest=8419)


sonarcloud[bot]: ## [![Quality Gate Passed](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/QualityGateBadge/qg-passed-20px.png 'Quality Gate Passed')](https://sonarcloud.io/dashboard?id=owncloud_ocis&pullRequest=8419) **Quality Gate passed**  
Issues  
![](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/passed-16px.png '') [0 New issues](https://sonarcloud.io/project/issues?id=owncloud_ocis&pullRequest=8419&resolved=false&inNewCodePeriod=true)

Measures  
![](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/passed-16px.png '') [0 Security Hotspots](https://sonarcloud.io/project/security_hotspots?id=owncloud_ocis&pullRequest=8419&resolved=false&inNewCodePeriod=true)  
![](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/passed-16px.png '') [0.0% Coverage on New Code](https://sonarcloud.io/component_measures?id=owncloud_ocis&pullRequest=8419&metric=new_coverage&view=list)  
![](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/passed-16px.png '') [0.9% Duplication on New Code](https://sonarcloud.io/component_measures?id=owncloud_ocis&pullRequest=8419&metric=new_duplicated_lines_density&view=list)  
  
[See analysis details on SonarCloud](https://sonarcloud.io/dashboard?id=owncloud_ocis&pullRequest=8419)


sonarcloud[bot]: ## [![Quality Gate Passed](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/QualityGateBadge/qg-passed-20px.png 'Quality Gate Passed')](https://sonarcloud.io/dashboard?id=owncloud_ocis&pullRequest=8419) **Quality Gate passed**  
Issues  
![](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/passed-16px.png '') [0 New issues](https://sonarcloud.io/project/issues?id=owncloud_ocis&pullRequest=8419&resolved=false&inNewCodePeriod=true)

Measures  
![](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/passed-16px.png '') [0 Security Hotspots](https://sonarcloud.io/project/security_hotspots?id=owncloud_ocis&pullRequest=8419&resolved=false&inNewCodePeriod=true)  
![](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/passed-16px.png '') [37.5% Coverage on New Code](https://sonarcloud.io/component_measures?id=owncloud_ocis&pullRequest=8419&metric=new_coverage&view=list)  
![](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/passed-16px.png '') [0.9% Duplication on New Code](https://sonarcloud.io/component_measures?id=owncloud_ocis&pullRequest=8419&metric=new_duplicated_lines_density&view=list)  
  
[See analysis details on SonarCloud](https://sonarcloud.io/dashboard?id=owncloud_ocis&pullRequest=8419)


sonarcloud[bot]: ## [![Quality Gate Passed](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/QualityGateBadge/qg-passed-20px.png 'Quality Gate Passed')](https://sonarcloud.io/dashboard?id=owncloud_ocis&pullRequest=8419) **Quality Gate passed**  
Issues  
![](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/passed-16px.png '') [0 New issues](https://sonarcloud.io/project/issues?id=owncloud_ocis&pullRequest=8419&resolved=false&inNewCodePeriod=true)

Measures  
![](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/passed-16px.png '') [0 Security Hotspots](https://sonarcloud.io/project/security_hotspots?id=owncloud_ocis&pullRequest=8419&resolved=false&inNewCodePeriod=true)  
![](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/passed-16px.png '') [37.5% Coverage on New Code](https://sonarcloud.io/component_measures?id=owncloud_ocis&pullRequest=8419&metric=new_coverage&view=list)  
![](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/passed-16px.png '') [1.0% Duplication on New Code](https://sonarcloud.io/component_measures?id=owncloud_ocis&pullRequest=8419&metric=new_duplicated_lines_density&view=list)  
  
[See analysis details on SonarCloud](https://sonarcloud.io/dashboard?id=owncloud_ocis&pullRequest=8419)


sonarcloud[bot]: ## [![Quality Gate Passed](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/QualityGateBadge/qg-passed-20px.png 'Quality Gate Passed')](https://sonarcloud.io/dashboard?id=owncloud_ocis&pullRequest=8419) **Quality Gate passed**  
Issues  
![](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/passed-16px.png '') [0 New issues](https://sonarcloud.io/project/issues?id=owncloud_ocis&pullRequest=8419&resolved=false&inNewCodePeriod=true)

Measures  
![](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/passed-16px.png '') [0 Security Hotspots](https://sonarcloud.io/project/security_hotspots?id=owncloud_ocis&pullRequest=8419&resolved=false&inNewCodePeriod=true)  
![](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/passed-16px.png '') [37.5% Coverage on New Code](https://sonarcloud.io/component_measures?id=owncloud_ocis&pullRequest=8419&metric=new_coverage&view=list)  
![](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/passed-16px.png '') [1.0% Duplication on New Code](https://sonarcloud.io/component_measures?id=owncloud_ocis&pullRequest=8419&metric=new_duplicated_lines_density&view=list)  
  
[See analysis details on SonarCloud](https://sonarcloud.io/dashboard?id=owncloud_ocis&pullRequest=8419)


butonic: Migration is not needed as the keys are ephemeral and can just be regenerated.
butonic: I forgot to not start the store service by default. will change the default services.
sonarcloud[bot]: ## [![Quality Gate Passed](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/QualityGateBadge/qg-passed-20px.png 'Quality Gate Passed')](https://sonarcloud.io/dashboard?id=owncloud_ocis&pullRequest=8419) **Quality Gate passed**  
Issues  
![](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/passed-16px.png '') [1 New issue](https://sonarcloud.io/project/issues?id=owncloud_ocis&pullRequest=8419&resolved=false&inNewCodePeriod=true)

Measures  
![](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/passed-16px.png '') [0 Security Hotspots](https://sonarcloud.io/project/security_hotspots?id=owncloud_ocis&pullRequest=8419&resolved=false&inNewCodePeriod=true)  
![](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/passed-16px.png '') [0.0% Coverage on New Code](https://sonarcloud.io/component_measures?id=owncloud_ocis&pullRequest=8419&metric=new_coverage&view=list)  
![](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/passed-16px.png '') [0.8% Duplication on New Code](https://sonarcloud.io/component_measures?id=owncloud_ocis&pullRequest=8419&metric=new_duplicated_lines_density&view=list)  
  
[See analysis details on SonarCloud](https://sonarcloud.io/dashboard?id=owncloud_ocis&pullRequest=8419)


sonarcloud[bot]: ## [![Quality Gate Passed](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/QualityGateBadge/qg-passed-20px.png 'Quality Gate Passed')](https://sonarcloud.io/dashboard?id=owncloud_ocis&pullRequest=8419) **Quality Gate passed**  
Issues  
![](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/passed-16px.png '') [1 New issue](https://sonarcloud.io/project/issues?id=owncloud_ocis&pullRequest=8419&resolved=false&inNewCodePeriod=true)

Measures  
![](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/passed-16px.png '') [0 Security Hotspots](https://sonarcloud.io/project/security_hotspots?id=owncloud_ocis&pullRequest=8419&resolved=false&inNewCodePeriod=true)  
![](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/passed-16px.png '') [4.6% Coverage on New Code](https://sonarcloud.io/component_measures?id=owncloud_ocis&pullRequest=8419&metric=new_coverage&view=list)  
![](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/passed-16px.png '') [0.3% Duplication on New Code](https://sonarcloud.io/component_measures?id=owncloud_ocis&pullRequest=8419&metric=new_duplicated_lines_density&view=list)  
  
[See analysis details on SonarCloud](https://sonarcloud.io/dashboard?id=owncloud_ocis&pullRequest=8419)


sonarcloud[bot]: ## [![Quality Gate Passed](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/QualityGateBadge/qg-passed-20px.png 'Quality Gate Passed')](https://sonarcloud.io/dashboard?id=owncloud_ocis&pullRequest=8419) **Quality Gate passed**  
Issues  
![](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/passed-16px.png '') [1 New issue](https://sonarcloud.io/project/issues?id=owncloud_ocis&pullRequest=8419&resolved=false&inNewCodePeriod=true)

Measures  
![](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/passed-16px.png '') [0 Security Hotspots](https://sonarcloud.io/project/security_hotspots?id=owncloud_ocis&pullRequest=8419&resolved=false&inNewCodePeriod=true)  
![](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/passed-16px.png '') [4.6% Coverage on New Code](https://sonarcloud.io/component_measures?id=owncloud_ocis&pullRequest=8419&metric=new_coverage&view=list)  
![](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/passed-16px.png '') [0.3% Duplication on New Code](https://sonarcloud.io/component_measures?id=owncloud_ocis&pullRequest=8419&metric=new_duplicated_lines_density&view=list)  
  
[See analysis details on SonarCloud](https://sonarcloud.io/dashboard?id=owncloud_ocis&pullRequest=8419)



Patch:
diff --git a/.drone.star b/.drone.star
index 3f86efd1fdf..47c47f439e8 100644
--- a/.drone.star
+++ b/.drone.star
@@ -1161,11 +1161,15 @@ def uiTestPipeline(ctx, filterTags, runPart = 1, numberOfParts = 1, storage = "o
 def e2eTests(ctx):
     test_suites = {
         "suite1": {
-            "path": "tests/e2e/cucumber/features/*/*[!.oc10].feature",
+            "path": "tests/e2e/cucumber/features/{smoke,journeys}/*.feature",
             "tikaNeeded": False,
         },
         "suite2": {
-            "path": "tests/e2e/cucumber/features/smoke/*[!app-provider]/*[!.oc10].feature",
+            "path": "tests/e2e/cucumber/features/smoke/{spaces,admin-settings}/*.feature",
+            "tikaNeeded": False,
+        },
+        "suite3": {
+            "path": "tests/e2e/cucumber/features/smoke/{search,shares}/*.feature",
             "tikaNeeded": True,
         },
     }
diff --git a/changelog/unreleased/change-presigned-key-store.md b/changelog/unreleased/change-presigned-key-store.md
new file mode 100644
index 00000000000..06ad0bd6b0a
--- /dev/null
+++ b/changelog/unreleased/change-presigned-key-store.md
@@ -0,0 +1,5 @@
+Change: change the default store for presigned keys to nats-js-kv
+
+We wrapped the store service in a micro store implementation and changed the default to the built-in NATS instance.
+
+https://github.com/owncloud/ocis/pull/8419
diff --git a/ocis/pkg/runtime/service/service.go b/ocis/pkg/runtime/service/service.go
index 7830bcde6e8..83d327f78e4 100644
--- a/ocis/pkg/runtime/service/service.go
+++ b/ocis/pkg/runtime/service/service.go
@@ -57,7 +57,6 @@ import (
 	storageshares "github.com/owncloud/ocis/v2/services/storage-shares/pkg/command"
 	storageSystem "github.com/owncloud/ocis/v2/services/storage-system/pkg/command"
 	storageusers "github.com/owncloud/ocis/v2/services/storage-users/pkg/command"
-	store "github.com/owncloud/ocis/v2/services/store/pkg/command"
 	thumbnails "github.com/owncloud/ocis/v2/services/thumbnails/pkg/command"
 	userlog "github.com/owncloud/ocis/v2/services/userlog/pkg/command"
 	users "github.com/owncloud/ocis/v2/services/users/pkg/command"
@@ -245,11 +244,6 @@ func NewService(options ...Option) (*Service, error) {
 		cfg.StorageUsers.Commons = cfg.Commons
 		return storageusers.Execute(cfg.StorageUsers)
 	})
-	reg(3, opts.Config.Store.Service.Name, func(ctx context.Context, cfg *ociscfg.Config) error {
-		cfg.Store.Context = ctx
-		cfg.Store.Commons = cfg.Commons
-		return store.Execute(cfg.Store)
-	})
 	reg(3, opts.Config.Thumbnails.Service.Name, func(ctx context.Context, cfg *ociscfg.Config) error {
 		cfg.Thumbnails.Context = ctx
 		cfg.Thumbnails.Commons = cfg.Commons
diff --git a/services/ocs/README.md b/services/ocs/README.md
index 6425f82a6c7..dd7a83f6d60 100644
--- a/services/ocs/README.md
+++ b/services/ocs/README.md
@@ -5,3 +5,20 @@ The `ocs` service (open collaboration services) serves one purpose: it has an en
 ## Signing-Keys Endpoint
 
 The `ocs` service contains an endpoint `/cloud/user/signing-key` on which a user can GET a signing key. Note, this functionality might be deprecated or moved in the future.
+
+## Signing-Keys Store
+
+To authenticate presigned URLs the proxy service needs to read the signing keys from a store that is populated by the ocs service.
+Possible stores that can be configured via `OCS_PRESIGNEDURL_SIGNING_KEYS_STORE` are:
+  -   `nats-js-kv`: Stores data using key-value-store feature of [nats jetstream](https://docs.nats.io/nats-concepts/jetstream/key-value-store)
+  -   `redis-sentinel`: Stores data in a configured Redis Sentinel cluster.
+  -   `ocisstoreservice`:  Stores data in the legacy ocis store service. Requires setting `OCS_PRESIGNEDURL_SIGNING_KEYS_STORE_NODES` to `com.owncloud.api.store`.
+
+The `memory` or `ocmem` stores cannot be used as they do not share the memory from the ocs service signing key memory store, even in a single process.
+
+Make sure to configure the same store in the proxy service.
+
+Store specific notes:
+  -   When using `redis-sentinel`, the Redis master to use is configured via e.g. `OCS_PRESIGNEDURL_SIGNING_KEYS_STORE_NODES` in the form of `<sentinel-host>:<sentinel-port>/<redis-master>` like `10.10.0.200:26379/mymaster`.
+  -   When using `nats-js-kv` it is recommended to set `PROXY_PRESIGNEDURL_SIGNING_KEYS_STORE_NODES` to the same value as `OCS_PRESIGNEDURL_SIGNING_KEYS_STORE_NODES`. That way the proxy uses the same nats instance as the ocs service.
+  -   When using `ocisstoreservice` the `OCS_PRESIGNEDURL_SIGNING_KEYS_STORE_NODES` must be set to the service name `com.owncloud.api.store`. It does not support TTL and stores the presigning keys indefinitely. Also, the store service needs to be started.
diff --git a/services/ocs/pkg/config/config.go b/services/ocs/pkg/config/config.go
index c8edf4c5005..e6e3768a20d 100644
--- a/services/ocs/pkg/config/config.go
+++ b/services/ocs/pkg/config/config.go
@@ -2,6 +2,7 @@ package config
 
 import (
 	"context"
+	"time"
 
 	"github.com/owncloud/ocis/v2/ocis-pkg/shared"
 	"go-micro.dev/v4/client"
@@ -22,7 +23,18 @@ type Config struct {
 	GRPCClientTLS *shared.GRPCClientTLS `yaml:"grpc_client_tls"`
 	GrpcClient    client.Client         `yaml:"-"`
 
+	SigningKeys *SigningKeys `yaml:"signing_keys"`
+
 	TokenManager *TokenManager `yaml:"token_manager"`
 
 	Context context.Context `yaml:"-"`
 }
+
+// SigningKeys is a store configuration.
+type SigningKeys struct {
+	Store        string        `yaml:"store" env:"OCIS_CACHE_STORE;OCS_PRESIGNEDURL_SIGNING_KEYS_STORE" desc:"The type of the signing key store. Supported values are: 'redis-sentinel' and 'nats-js-kv'. See the text description for details."`
+	Nodes        []string      `yaml:"addresses" env:"OCIS_CACHE_STORE_NODES;OCS_PRESIGNEDURL_SIGNING_KEYS_STORE_NODES" desc:"A list of nodes to access the configured store. Note that the behaviour how nodes are used is dependent on the library of the configured store. See the Environment Variable Types description for more details."`
+	TTL          time.Duration `yaml:"ttl" env:"OCIS_CACHE_TTL;OCS_PRESIGNEDURL_SIGNING_KEYS_STORE_TTL" desc:"Default time to live for signing keys. See the Environment Variable Types description for more details."`
+	AuthUsername string        `yaml:"username" env:"OCIS_CACHE_AUTH_USERNAME;OCS_PRESIGNEDURL_SIGNING_KEYS_STORE_AUTH_USERNAME" desc:"The username to authenticate with the store. Only applies when store type 'nats-js-kv' is configured."`
+	AuthPassword string        `yaml:"password" env:"OCIS_CACHE_AUTH_PASSWORD;OCS_PRESIGNEDURL_SIGNING_KEYS_STORE_AUTH_PASSWORD" desc:"The password to authenticate with the store. Only applies when store type 'nats-js-kv' is configured."`
+}
diff --git a/services/ocs/pkg/config/defaults/defaultconfig.go b/services/ocs/pkg/config/defaults/defaultconfig.go
index 02a456b0d57..6a9ebec588c 100644
--- a/services/ocs/pkg/config/defaults/defaultconfig.go
+++ b/services/ocs/pkg/config/defaults/defaultconfig.go
@@ -2,6 +2,7 @@ package defaults
 
 import (
 	"strings"
+	"time"
 
 	"github.com/owncloud/ocis/v2/ocis-pkg/structs"
 	"github.com/owncloud/ocis/v2/services/ocs/pkg/config"
@@ -38,6 +39,11 @@ func DefaultConfig() *config.Config {
 		Service: config.Service{
 			Name: "ocs",
 		},
+		SigningKeys: &config.SigningKeys{
+			Store: "nats-js-kv", // signing keys are read by proxy, so we cannot use memory. It is not shared.
+			Nodes: []string{"127.0.0.1:9233"},
+			TTL:   time.Hour * 12,
+		},
 	}
 }
 
diff --git a/services/ocs/pkg/server/http/server.go b/services/ocs/pkg/server/http/server.go
index 58d9525a04c..d7d8837fff4 100644
--- a/services/ocs/pkg/server/http/server.go
+++ b/services/ocs/pkg/server/http/server.go
@@ -3,6 +3,7 @@ package http
 import (
 	"fmt"
 
+	"github.com/cs3org/reva/v2/pkg/store"
 	chimiddleware "github.com/go-chi/chi/v5/middleware"
 	"github.com/owncloud/ocis/v2/ocis-pkg/cors"
 	"github.com/owncloud/ocis/v2/ocis-pkg/middleware"
@@ -10,7 +11,9 @@ import (
 	"github.com/owncloud/ocis/v2/ocis-pkg/version"
 	ocsmw "github.com/owncloud/ocis/v2/services/ocs/pkg/middleware"
 	svc "github.com/owncloud/ocis/v2/services/ocs/pkg/service/v0"
+	ocisstore "github.com/owncloud/ocis/v2/services/store/pkg/store"
 	"go-micro.dev/v4"
+	microstore "go-micro.dev/v4/store"
 )
 
 // Server initializes the http service and server.
@@ -34,6 +37,24 @@ func Server(opts ...Option) (http.Service, error) {
 		return http.Service{}, fmt.Errorf("could not initialize http service: %w", err)
 	}
 
+	var signingKeyStore microstore.Store
+	if options.Config.SigningKeys.Store == "ocisstoreservice" {
+		signingKeyStore = ocisstore.NewStore(
+			microstore.Nodes(options.Config.SigningKeys.Nodes...),
+			microstore.Database("proxy"),
+			microstore.Table("signing-keys"),
+		)
+	} else {
+		signingKeyStore = store.Create(
+			store.Store(options.Config.SigningKeys.Store),
+			store.TTL(options.Config.SigningKeys.TTL),
+			microstore.Nodes(options.Config.SigningKeys.Nodes...),
+			microstore.Database("proxy"),
+			microstore.Table("signing-keys"),
+			store.Authentication(options.Config.SigningKeys.AuthUsername, options.Config.SigningKeys.AuthPassword),
+		)
+	}
+
 	handle := svc.NewService(
 		svc.Logger(options.Logger),
 		svc.Config(options.Config),
@@ -56,6 +77,7 @@ func Server(opts ...Option) (http.Service, error) {
 			middleware.Logger(options.Logger),
 			ocsmw.LogTrace,
 		),
+		svc.Store(signingKeyStore),
 	)
 
 	{
diff --git a/services/ocs/pkg/service/v0/option.go b/services/ocs/pkg/service/v0/option.go
index 40ccc9e1c76..9bf3c37ca9e 100644
--- a/services/ocs/pkg/service/v0/option.go
+++ b/services/ocs/pkg/service/v0/option.go
@@ -5,6 +5,7 @@ import (
 
 	"github.com/owncloud/ocis/v2/ocis-pkg/log"
 	"github.com/owncloud/ocis/v2/services/ocs/pkg/config"
+	"go-micro.dev/v4/store"
 )
 
 // Option defines a single option function.
@@ -15,6 +16,7 @@ type Options struct {
 	Logger     log.Logger
 	Config     *config.Config
 	Middleware []func(http.Handler) http.Handler
+	Store      store.Store
 }
 
 // newOptions initializes the available default options.
@@ -48,3 +50,10 @@ func Middleware(val ...func(http.Handler) http.Handler) Option {
 		o.Middleware = val
 	}
 }
+
+// Store provides a function to set the store option.
+func Store(s store.Store) Option {
+	return func(o *Options) {
+		o.Store = s
+	}
+}
diff --git a/services/ocs/pkg/service/v0/service.go b/services/ocs/pkg/service/v0/service.go
index 5e333415a9f..207a33e0f5a 100644
--- a/services/ocs/pkg/service/v0/service.go
+++ b/services/ocs/pkg/service/v0/service.go
@@ -14,6 +14,7 @@ import (
 	ocsm "github.com/owncloud/ocis/v2/services/ocs/pkg/middleware"
 	"github.com/owncloud/ocis/v2/services/ocs/pkg/service/v0/data"
 	"github.com/owncloud/ocis/v2/services/ocs/pkg/service/v0/response"
+	microstore "go-micro.dev/v4/store"
 )
 
 // Service defines the service handlers.
@@ -32,6 +33,7 @@ func NewService(opts ...Option) Service {
 		config: options.Config,
 		mux:    m,
 		logger: options.Logger,
+		store:  options.Store,
 	}
 
 	m.Route(options.Config.HTTP.Root, func(r chi.Router) {
@@ -61,6 +63,7 @@ type Ocs struct {
 	config *config.Config
 	logger log.Logger
 	mux    *chi.Mux
+	store  microstore.Store
 }
 
 // ServeHTTP implements the Service interface.
diff --git a/services/ocs/pkg/service/v0/users.go b/services/ocs/pkg/service/v0/users.go
index 00bab3eb0a1..190e9bccd4c 100644
--- a/services/ocs/pkg/service/v0/users.go
+++ b/services/ocs/pkg/service/v0/users.go
@@ -3,15 +3,13 @@ package svc
 import (
 	"crypto/rand"
 	"encoding/hex"
+	"errors"
 	"net/http"
 
-	storemsg "github.com/owncloud/ocis/v2/protogen/gen/ocis/messages/store/v0"
-	storesvc "github.com/owncloud/ocis/v2/protogen/gen/ocis/services/store/v0"
-
 	revactx "github.com/cs3org/reva/v2/pkg/ctx"
 	"github.com/owncloud/ocis/v2/services/ocs/pkg/service/v0/data"
 	"github.com/owncloud/ocis/v2/services/ocs/pkg/service/v0/response"
-	merrors "go-micro.dev/v4/errors"
+	"go-micro.dev/v4/store"
 )
 
 // GetSigningKey returns the signing key for the current user. It will create it on the fly if it does not exist
@@ -28,24 +26,16 @@ func (o Ocs) GetSigningKey(w http.ResponseWriter, r *http.Request) {
 	// use the user's UUID
 	userID := u.Id.OpaqueId
 
-	c := storesvc.NewStoreService("com.owncloud.api.store", o.config.GrpcClient)
-	res, err := c.Read(r.Context(), &storesvc.ReadRequest{
-		Options: &storemsg.ReadOptions{
-			Database: "proxy",
-			Table:    "signing-keys",
-		},
-		Key: userID,
-	})
-	if err == nil && len(res.Records) > 0 {
+	res, err := o.store.Read(userID)
+	if err == nil && len(res) > 0 {
 		o.mustRender(w, r, response.DataRender(&data.SigningKey{
 			User:       userID,
-			SigningKey: string(res.Records[0].Value),
+			SigningKey: string(res[0].Value),
 		}))
 		return
 	}
 	if err != nil {
-		e := merrors.Parse(err.Error())
-		if e.Code == http.StatusNotFound {
+		if errors.Is(err, store.ErrNotFound) {
 			// not found is ok, so we can continue and generate the key on the fly
 		} else {
 			o.logger.Error().Err(err).Msg("error reading from server")
@@ -63,20 +53,8 @@ func (o Ocs) GetSigningKey(w http.ResponseWriter, r *http.Request) {
 	}
 	signingKey := hex.EncodeToString(key)
 
-	_, err = c.Write(r.Context(), &storesvc.WriteRequest{
-		Options: &storemsg.WriteOptions{
-			Database: "proxy",
-			Table:    "signing-keys",
-		},
-		Record: &storemsg.Record{
-			Key:   userID,
-			Value: []byte(signingKey),
-			// TODO Expiry?
-		},
-	})
-
+	err = o.store.Write(&store.Record{Key: userID, Value: []byte(signingKey)})
 	if err != nil {
-		//o.logger.Error().Err(err).Msg("error writing key")
 		o.mustRender(w, r, response.ErrRender(data.MetaServerError.StatusCode, "could not persist signing key"))
 		return
 	}
diff --git a/services/proxy/README.md b/services/proxy/README.md
index d34424fbd90..a963287c18e 100644
--- a/services/proxy/README.md
+++ b/services/proxy/README.md
@@ -153,6 +153,25 @@ Store specific notes:
   -   When using `nats-js-kv` it is recommended to set `OCIS_CACHE_STORE_NODES` to the same value as `OCIS_EVENTS_ENDPOINT`. That way the cache uses the same nats instance as the event bus.
   -   When using the `nats-js-kv` store, it is possible to set `OCIS_CACHE_DISABLE_PERSISTENCE` to instruct nats to not persist cache data on disc.
 
+  
+## Presigned Urls
+
+To authenticate presigned URLs the proxy service needs to read signing keys from a store that is populated by the ocs service. Possible stores are:
+  -   `nats-js-kv`: Stores data using key-value-store feature of [nats jetstream](https://docs.nats.io/nats-concepts/jetstream/key-value-store)
+  -   `redis-sentinel`: Stores data in a configured Redis Sentinel cluster.
+  -   `ocisstoreservice`:  Stores data in the legacy ocis store service. Requires setting `PROXY_PRESIGNEDURL_SIGNING_KEYS_STORE_NODES` to `com.owncloud.api.store`.
+
+The `memory` or `ocmem` stores cannot be used as they do not share the memory from the ocs service signing key memory store, even in a single process.
+
+Make sure to configure the same store in the ocs service.
+
+Store specific notes:
+  -   When using `redis-sentinel`, the Redis master to use is configured via e.g. `OCIS_CACHE_STORE_NODES` in the form of `<sentinel-host>:<sentinel-port>/<redis-master>` like `10.10.0.200:26379/mymaster`.
+  -   When using `nats-js-kv` it is recommended to set `OCS_PRESIGNEDURL_SIGNING_KEYS_STORE_NODES` to the same value as `PROXY_PRESIGNEDURL_SIGNING_KEYS_STORE_NODES`. That way the ocs uses the same nats instance as the proxy service.
+  -   When using the `nats-js-kv` store, it is possible to set `PROXY_PRESIGNEDURL_SIGNING_KEYS_STORE_DISABLE_PERSISTENCE` to instruct nats to not persist signing key data on disc.
+  -   When using `ocisstoreservice` the `PROXY_PRESIGNEDURL_SIGNING_KEYS_STORE_NODES` must be set to the service name `com.owncloud.api.store`. It does not support TTL and stores the presigning keys indefinitely. Also, the store service needs to be started.
+
+
 ## Special Settings
 
 When using the ocis IDP service instead of an external IDP:
diff --git a/services/proxy/pkg/command/server.go b/services/proxy/pkg/command/server.go
index 3363f048c1d..a3739163e9a 100644
--- a/services/proxy/pkg/command/server.go
+++ b/services/proxy/pkg/command/server.go
@@ -31,7 +31,6 @@ import (
 	"github.com/owncloud/ocis/v2/ocis-pkg/version"
 	policiessvc "github.com/owncloud/ocis/v2/protogen/gen/ocis/services/policies/v0"
 	settingssvc "github.com/owncloud/ocis/v2/protogen/gen/ocis/services/settings/v0"
-	storesvc "github.com/owncloud/ocis/v2/protogen/gen/ocis/services/store/v0"
 	"github.com/owncloud/ocis/v2/services/proxy/pkg/config"
 	"github.com/owncloud/ocis/v2/services/proxy/pkg/config/parser"
 	"github.com/owncloud/ocis/v2/services/proxy/pkg/logging"
@@ -43,6 +42,7 @@ import (
 	proxyHTTP "github.com/owncloud/ocis/v2/services/proxy/pkg/server/http"
 	"github.com/owncloud/ocis/v2/services/proxy/pkg/user/backend"
 	"github.com/owncloud/ocis/v2/services/proxy/pkg/userroles"
+	ocisstore "github.com/owncloud/ocis/v2/services/store/pkg/store"
 )
 
 // Server is the entrypoint for the server command.
@@ -66,6 +66,24 @@ func Server(cfg *config.Config) *cli.Command {
 				store.Authentication(cfg.OIDC.UserinfoCache.AuthUsername, cfg.OIDC.UserinfoCache.AuthPassword),
 			)
 
+			var signingKeyStore microstore.Store
+			if cfg.PreSignedURL.SigningKeys.Store == "ocisstoreservice" {
+				signingKeyStore = ocisstore.NewStore(
+					microstore.Nodes(cfg.PreSignedURL.SigningKeys.Nodes...),
+					microstore.Database("proxy"),
+					microstore.Table("signing-keys"),
+				)
+			} else {
+				signingKeyStore = store.Create(
+					store.Store(cfg.PreSignedURL.SigningKeys.Store),
+					store.TTL(cfg.PreSignedURL.SigningKeys.TTL),
+					microstore.Nodes(cfg.PreSignedURL.SigningKeys.Nodes...),
+					microstore.Database("proxy"),
+					microstore.Table("signing-keys"),
+					store.Authentication(cfg.PreSignedURL.SigningKeys.AuthUsername, cfg.PreSignedURL.SigningKeys.AuthPassword),
+				)
+			}
+
 			logger := logging.Configure(cfg.Service.Name, cfg.Log)
 			traceProvider, err := tracing.GetServiceTraceProvider(cfg.Tracing, cfg.Service.Name)
 			if err != nil {
@@ -130,7 +148,7 @@ func Server(cfg *config.Config) *cli.Command {
 			}
 
 			{
-				middlewares := loadMiddlewares(ctx, logger, cfg, userInfoCache, traceProvider, *m)
+				middlewares := loadMiddlewares(ctx, logger, cfg, userInfoCache, signingKeyStore, traceProvider, *m)
 				server, err := proxyHTTP.Server(
 					proxyHTTP.Handler(lh.handler()),
 					proxyHTTP.Logger(logger),
@@ -271,7 +289,7 @@ func (h *StaticRouteHandler) backchannelLogout(w http.ResponseWriter, r *http.Re
 	render.JSON(w, r, nil)
 }
 
-func loadMiddlewares(ctx context.Context, logger log.Logger, cfg *config.Config, userInfoCache microstore.Store, traceProvider trace.TracerProvider, metrics metrics.Metrics) alice.Chain {
+func loadMiddlewares(ctx context.Context, logger log.Logger, cfg *config.Config, userInfoCache, signingKeyStore microstore.Store, traceProvider trace.TracerProvider, metrics metrics.Metrics) alice.Chain {
 	rolesClient := settingssvc.NewRoleService("com.owncloud.api.settings", cfg.GrpcClient)
 	policiesProviderClient := policiessvc.NewPoliciesProviderService("com.owncloud.api.policies", cfg.GrpcClient)
 	gatewaySelector, err := pool.GatewaySelector(
@@ -322,13 +340,6 @@ func loadMiddlewares(ctx context.Context, logger log.Logger, cfg *config.Config,
 		logger.Fatal().Msgf("Invalid role assignment driver '%s'", cfg.RoleAssignment.Driver)
 	}
 
-	storeClient := storesvc.NewStoreService("com.owncloud.api.store", cfg.GrpcClient)
-	if err != nil {
-		logger.Error().Err(err).
-			Str("gateway", cfg.Reva.Address).
-			Msg("Failed to create reva gateway service client")
-	}
-
 	oidcHTTPClient := &http.Client{
 		Transport: &http.Transport{
 			TLSClientConfig: &tls.Config{
@@ -373,7 +384,7 @@ func loadMiddlewares(ctx context.Context, logger log.Logger, cfg *config.Config,
 		PreSignedURLConfig: cfg.PreSignedURL,
 		UserProvider:       userProvider,
 		UserRoleAssigner:   roleAssigner,
-		Store:              storeClient,
+		Store:              signingKeyStore,
 		Now:                time.Now,
 	})
 
diff --git a/services/proxy/pkg/config/config.go b/services/proxy/pkg/config/config.go
index 8ddb8c6ff43..264fcefe8e2 100644
--- a/services/proxy/pkg/config/config.go
+++ b/services/proxy/pkg/config/config.go
@@ -166,8 +166,19 @@ type StaticSelectorConf struct {
 
 // PreSignedURL is the config for the presigned url middleware
 type PreSignedURL struct {
-	AllowedHTTPMethods []string `yaml:"allowed_http_methods"`
-	Enabled            bool     `yaml:"enabled" env:"PROXY_ENABLE_PRESIGNEDURLS" desc:"Allow OCS to get a signing key to sign requests."`
+	AllowedHTTPMethods []string     `yaml:"allowed_http_methods"`
+	Enabled            bool         `yaml:"enabled" env:"PROXY_ENABLE_PRESIGNEDURLS" desc:"Allow OCS to get a signing key to sign requests."`
+	SigningKeys        *SigningKeys `yaml:"signing_keys"`
+}
+
+// SigningKeys is a store configuration.
+type SigningKeys struct {
+	Store              string        `yaml:"store" env:"OCIS_CACHE_STORE;PROXY_PRESIGNEDURL_SIGNING_KEYS_STORE" desc:"The type of the signing key store. Supported values are: 'redis-sentinel', 'nats-js-kv' and 'ocisstoreservice' (deprecated). See the text description for details."`
+	Nodes              []string      `yaml:"addresses" env:"OCIS_CACHE_STORE_NODES;PROXY_PRESIGNEDURL_SIGNING_KEYS_STORE_NODES" desc:"A list of nodes to access the configured store. Note that the behaviour how nodes are used is dependent on the library of the configured store. See the Environment Variable Types description for more details."`
+	TTL                time.Duration `yaml:"ttl" env:"OCIS_CACHE_TTL;PROXY_PRESIGNEDURL_SIGNING_KEYS_STORE_TTL" desc:"Default time to live for signing keys. See the Environment Variable Types description for more details."`
+	DisablePersistence bool          `yaml:"disable_persistence" env:"OCIS_CACHE_DISABLE_PERSISTENCE;PROXY_PRESIGNEDURL_SIGNING_KEYS_STORE_DISABLE_PERSISTENCE" desc:"Disables persistence of the store. Only applies when store type 'nats-js-kv' is configured. Defaults to true."`
+	AuthUsername       string        `yaml:"username" env:"OCIS_CACHE_AUTH_USERNAME;PROXY_PRESIGNEDURL_SIGNING_KEYS_STORE_AUTH_USERNAME" desc:"The username to authenticate with the store. Only applies when store type 'nats-js-kv' is configured."`
+	AuthPassword       string        `yaml:"password" env:"OCIS_CACHE_AUTH_PASSWORD;PROXY_PRESIGNEDURL_SIGNING_KEYS_STORE_AUTH_PASSWORD" desc:"The password to authenticate with the store. Only applies when store type 'nats-js-kv' is configured."`
 }
 
 // ClaimsSelectorConf is the config for the claims-selector
diff --git a/services/proxy/pkg/config/defaults/defaultconfig.go b/services/proxy/pkg/config/defaults/defaultconfig.go
index 9c07ecb8844..b6a9fd262a5 100644
--- a/services/proxy/pkg/config/defaults/defaultconfig.go
+++ b/services/proxy/pkg/config/defaults/defaultconfig.go
@@ -73,6 +73,12 @@ func DefaultConfig() *config.Config {
 		PreSignedURL: config.PreSignedURL{
 			AllowedHTTPMethods: []string{"GET"},
 			Enabled:            true,
+			SigningKeys: &config.SigningKeys{
+				Store:              "nats-js-kv", // signing keys are written by ocs, so we cannot use memory. It is not shared.
+				Nodes:              []string{"127.0.0.1:9233"},
+				TTL:                time.Hour * 12,
+				DisablePersistence: true,
+			},
 		},
 		AccountBackend:        "cs3",
 		UserOIDCClaim:         "preferred_username",
diff --git a/services/proxy/pkg/middleware/options.go b/services/proxy/pkg/middleware/options.go
index 68c567a673a..917f5ca3115 100644
--- a/services/proxy/pkg/middleware/options.go
+++ b/services/proxy/pkg/middleware/options.go
@@ -5,19 +5,16 @@ import (
 	"time"
 
 	gateway "github.com/cs3org/go-cs3apis/cs3/gateway/v1beta1"
-	"go-micro.dev/v4/store"
-	"go.opentelemetry.io/otel/trace"
-
 	"github.com/cs3org/reva/v2/pkg/rgrpc/todo/pool"
-
 	"github.com/owncloud/ocis/v2/ocis-pkg/log"
 	"github.com/owncloud/ocis/v2/ocis-pkg/oidc"
 	policiessvc "github.com/owncloud/ocis/v2/protogen/gen/ocis/services/policies/v0"
 	settingssvc "github.com/owncloud/ocis/v2/protogen/gen/ocis/services/settings/v0"
-	storesvc "github.com/owncloud/ocis/v2/protogen/gen/ocis/services/store/v0"
 	"github.com/owncloud/ocis/v2/services/proxy/pkg/config"
 	"github.com/owncloud/ocis/v2/services/proxy/pkg/user/backend"
 	"github.com/owncloud/ocis/v2/services/proxy/pkg/userroles"
+	"go-micro.dev/v4/store"
+	"go.opentelemetry.io/otel/trace"
 )
 
 // Option defines a single option function.
@@ -45,8 +42,6 @@ type Options struct {
 	OIDCIss string
 	// RevaGatewaySelector to send requests to the reva gateway
 	RevaGatewaySelector pool.Selectable[gateway.GatewayAPIClient]
-	// Store for persisting data
-	Store storesvc.StoreService
 	// PreSignedURLConfig to configure the middleware
 	PreSignedURLConfig config.PreSignedURL
 	// UserOIDCClaim to read from the oidc claims
@@ -151,13 +146,6 @@ func WithRevaGatewaySelector(val pool.Selectable[gateway.GatewayAPIClient]) Opti
 	}
 }
 
-// Store provides a function to set the store option.
-func Store(sc storesvc.StoreService) Option {
-	return func(o *Options) {
-		o.Store = sc
-	}
-}
-
 // PreSignedURLConfig provides a function to set the PreSignedURL config
 func PreSignedURLConfig(cfg config.PreSignedURL) Option {
 	return func(o *Options) {
diff --git a/services/proxy/pkg/middleware/signed_url_auth.go b/services/proxy/pkg/middleware/signed_url_auth.go
index b3c842a26f9..bc2b72aa2be 100644
--- a/services/proxy/pkg/middleware/signed_url_auth.go
+++ b/services/proxy/pkg/middleware/signed_url_auth.go
@@ -1,7 +1,6 @@
 package middleware
 
 import (
-	"context"
 	"crypto/sha512"
 	"encoding/hex"
 	"errors"
@@ -13,11 +12,10 @@ import (
 
 	revactx "github.com/cs3org/reva/v2/pkg/ctx"
 	"github.com/owncloud/ocis/v2/ocis-pkg/log"
-	storemsg "github.com/owncloud/ocis/v2/protogen/gen/ocis/messages/store/v0"
-	storesvc "github.com/owncloud/ocis/v2/protogen/gen/ocis/services/store/v0"
 	"github.com/owncloud/ocis/v2/services/proxy/pkg/config"
 	"github.com/owncloud/ocis/v2/services/proxy/pkg/user/backend"
 	"github.com/owncloud/ocis/v2/services/proxy/pkg/userroles"
+	microstore "go-micro.dev/v4/store"
 	"golang.org/x/crypto/pbkdf2"
 )
 
@@ -46,7 +44,7 @@ type SignedURLAuthenticator struct {
 	PreSignedURLConfig config.PreSignedURL
 	UserProvider       backend.UserBackend
 	UserRoleAssigner   userroles.UserRoleAssigner
-	Store              storesvc.StoreService
+	Store              microstore.Store
 	Now                func() time.Time
 }
 
@@ -147,17 +145,17 @@ func (m SignedURLAuthenticator) urlIsExpired(query url.Values) (err error) {
 
 func (m SignedURLAuthenticator) signatureIsValid(req *http.Request) (err error) {
 	c := revactx.ContextMustGetUser(req.Context())
-	signingKey, err := m.getSigningKey(req.Context(), c.Id.OpaqueId)
+	signingKey, err := m.Store.Read(c.Id.OpaqueId)
 	if err != nil {
 		m.Logger.Error().Err(err).Msg("could not retrieve signing key")
 		return err
 	}
-	if len(signingKey) == 0 {
+	if len(signingKey[0].Value) == 0 {
 		m.Logger.Error().Err(err).Msg("signing key empty")
 		return err
 	}
 	u := m.buildUrlToSign(req)
-	computedSignature := m.createSignature(u, signingKey)
+	computedSignature := m.createSignature(u, signingKey[0].Value)
 	signatureInURL := req.URL.Query().Get(_paramOCSignature)
 	if computedSignature == signatureInURL {
 		return nil
@@ -206,21 +204,6 @@ func (m SignedURLAuthenticator) createSignature(url string, signingKey []byte) s
 	return hex.EncodeToString(hash)
 }
 
-func (m SignedURLAuthenticator) getSigningKey(ctx context.Context, ocisID string) ([]byte, error) {
-	res, err := m.Store.Read(ctx, &storesvc.ReadRequest{
-		Options: &storemsg.ReadOptions{
-			Database: "proxy",
-			Table:    "signing-keys",
-		},
-		Key: ocisID,
-	})
-	if err != nil || len(res.Records) < 1 {
-		return nil, err
-	}
-
-	return res.Records[0].Value, nil
-}
-
 // Authenticate implements the authenticator interface to authenticate requests via signed URL auth.
 func (m SignedURLAuthenticator) Authenticate(r *http.Request) (*http.Request, bool) {
 	if !m.shouldServe(r) {
diff --git a/services/store/pkg/store/options.go b/services/store/pkg/store/options.go
new file mode 100644
index 00000000000..949425c795e
--- /dev/null
+++ b/services/store/pkg/store/options.go
@@ -0,0 +1,20 @@
+package store
+
+import (
+	"context"
+
+	"go-micro.dev/v4/client"
+	"go-micro.dev/v4/store"
+)
+
+type grpcClientContextKey struct{}
+
+// WithGRPCClient sets the grpc client
+func WithGRPCClient(c client.Client) store.Option {
+	return func(o *store.Options) {
+		if o.Context == nil {
+			o.Context = context.Background()
+		}
+		o.Context = context.WithValue(o.Context, grpcClientContextKey{}, c)
+	}
+}
diff --git a/services/store/pkg/store/store.go b/services/store/pkg/store/store.go
new file mode 100644
index 00000000000..47e7ee57dfa
--- /dev/null
+++ b/services/store/pkg/store/store.go
@@ -0,0 +1,189 @@
+package store
+
+import (
+	"context"
+	"errors"
+	"net/http"
+	"time"
+
+	"github.com/owncloud/ocis/v2/ocis-pkg/service/grpc"
+	storemsg "github.com/owncloud/ocis/v2/protogen/gen/ocis/messages/store/v0"
+	storesvc "github.com/owncloud/ocis/v2/protogen/gen/ocis/services/store/v0"
+	"go-micro.dev/v4/client"
+	merrors "go-micro.dev/v4/errors"
+	"go-micro.dev/v4/logger"
+	"go-micro.dev/v4/store"
+	"go-micro.dev/v4/util/cmd"
+)
+
+// DefaultDatabase is the namespace that the store
+// will use if no namespace is provided.
+var (
+	DefaultDatabase = "proxy"
+	DefaultTable    = "signing-keys"
+)
+
+type oss struct {
+	ctx     context.Context
+	options store.Options
+	svc     storesvc.StoreService
+}
+
+func init() {
+	cmd.DefaultStores["ocisstoreservice"] = NewStore
+}
+
+// NewStore returns a micro store.Store wrapper to access the micro store service.
+// It only implements the minimal Read and Write options that are used by the proxy and ocs services
+// Deprecated: use a different micro.Store implementation like nats-js-ks
+func NewStore(opts ...store.Option) store.Store {
+	options := store.Options{
+		Context:  context.Background(),
+		Database: DefaultDatabase,
+		Table:    DefaultTable,
+		Logger:   logger.DefaultLogger,
+		Nodes:    []string{"com.owncloud.api.store"},
+	}
+
+	for _, o := range opts {
+		o(&options)
+	}
+
+	c, ok := options.Context.Value(grpcClientContextKey{}).(client.Client)
+	if !ok {
+		var err error
+		c, err = grpc.NewClient()
+		if err != nil {
+			options.Logger.Fields(map[string]interface{}{"err": err}).Log(logger.FatalLevel, "ocisstoreservice could not create new grpc client")
+		}
+	}
+	svc := storesvc.NewStoreService(options.Nodes[0], c)
+
+	s := &oss{
+		ctx:     context.Background(),
+		options: options,
+		svc:     svc,
+	}
+
+	return s
+}
+
+// Init initializes the store by configuring a storeservice and initializing
+// a grpc client if it has not been passed as a context option.
+func (s *oss) Init(opts ...store.Option) error {
+	for _, o := range opts {
+		o(&s.options)
+	}
+	return s.configure()
+}
+
+func (s *oss) configure() error {
+	c, ok := s.options.Context.Value(grpcClientContextKey{}).(client.Client)
+	if !ok {
+		var err error
+		c, err = grpc.NewClient()
+		if err != nil {
+			logger.Fatal("ocisstoreservice could not create new grpc client:", err)
+		}
+	}
+	if len(s.options.Nodes) < 1 {
+		return errors.New("no node configured")
+	}
+	s.svc = storesvc.NewStoreService(s.options.Nodes[0], c)
+	return nil
+}
+
+// Options allows you to view the current options.
+func (s *oss) Options() store.Options {
+	return s.options
+}
+
+// Read takes a single key name and optional ReadOptions. It returns matching []*Record or an error.
+// Only database and table options are used.
+func (s *oss) Read(key string, opts ...store.ReadOption) ([]*store.Record, error) {
+	options := store.ReadOptions{
+		Database: s.options.Database,
+		Table:    s.options.Table,
+	}
+
+	for _, o := range opts {
+		o(&options)
+	}
+
+	res, err := s.svc.Read(context.Background(), &storesvc.ReadRequest{
+		Options: &storemsg.ReadOptions{
+			Database: options.Database,
+			Table:    options.Table,
+			// Other options ignored
+		},
+		Key: key,
+	})
+
+	if err != nil {
+		e := merrors.Parse(err.Error())
+		if e.Code == http.StatusNotFound {
+			return nil, store.ErrNotFound
+		}
+		return nil, err
+	}
+
+	records := make([]*store.Record, 0, len(res.Records))
+	for _, record := range res.Records {
+		r := &store.Record{
+			Key:      record.Key,
+			Value:    record.Value,
+			Metadata: map[string]interface{}{},
+			Expiry:   time.Duration(record.Expiry),
+		}
+		for k, v := range record.Metadata {
+			r.Metadata[k] = v.Value // we only support string
+		}
+		records = append(records, r)
+	}
+	return records, nil
+}
+
+// Write() writes a record to the store, and returns an error if the record was not written.
+func (s *oss) Write(r *store.Record, opts ...store.WriteOption) error {
+	options := store.WriteOptions{
+		Database: s.options.Database,
+		Table:    s.options.Table,
+	}
+
+	for _, o := range opts {
+		o(&options)
+	}
+	_, err := s.svc.Write(context.Background(), &storesvc.WriteRequest{
+		Options: &storemsg.WriteOptions{
+			Database: options.Database,
+			Table:    options.Table,
+		},
+		Record: &storemsg.Record{
+			Key:   r.Key,
+			Value: r.Value,
+			// No expiry supported
+		},
+	})
+
+	return err
+}
+
+// Delete is not implemented for the ocis service
+func (s *oss) Delete(key string, opts ...store.DeleteOption) error {
+	return errors.ErrUnsupported
+}
+
+// List is not implemented for the ocis service
+func (s *oss) List(opts ...store.ListOption) ([]string, error) {
+	return nil, errors.ErrUnsupported
+}
+
+// Close does nothing
+func (s *oss) Close() error {
+	return nil
+}
+
+// String returns the name of the implementation.
+func (s *oss) String() string {
+	return "ocisstoreservice"
+}


Test patch:
diff --git a/services/proxy/pkg/middleware/signed_url_auth_test.go b/services/proxy/pkg/middleware/signed_url_auth_test.go
index a14edc01f42..dbbea75d62e 100644
--- a/services/proxy/pkg/middleware/signed_url_auth_test.go
+++ b/services/proxy/pkg/middleware/signed_url_auth_test.go
@@ -2,16 +2,15 @@ package middleware
 
 import (
 	"context"
+	"net/http/httptest"
+	"testing"
+	"time"
+
 	userpb "github.com/cs3org/go-cs3apis/cs3/identity/user/v1beta1"
 	revactx "github.com/cs3org/reva/v2/pkg/ctx"
-	storemsg "github.com/owncloud/ocis/v2/protogen/gen/ocis/messages/store/v0"
-	v0 "github.com/owncloud/ocis/v2/protogen/gen/ocis/services/store/v0"
 	"github.com/owncloud/ocis/v2/services/proxy/pkg/config"
 	"github.com/stretchr/testify/assert"
-	"go-micro.dev/v4/client"
-	"net/http/httptest"
-	"testing"
-	"time"
+	"go-micro.dev/v4/store"
 )
 
 func TestSignedURLAuth_shouldServe(t *testing.T) {
@@ -159,36 +158,6 @@ func TestSignedURLAuth_createSignature(t *testing.T) {
 	}
 }
 
-type MyStoreService struct {
-}
-
-func (s MyStoreService) Read(_ context.Context, _ *v0.ReadRequest, _ ...client.CallOption) (*v0.ReadResponse, error) {
-	r := v0.ReadResponse{
-		Records: []*storemsg.Record{{
-			Key:      "foo",
-			Value:    []byte("1234567890"),
-			Expiry:   0,
-			Metadata: nil,
-		}},
-	}
-	return &r, nil
-}
-func (s MyStoreService) Write(_ context.Context, _ *v0.WriteRequest, _ ...client.CallOption) (*v0.WriteResponse, error) {
-	return nil, nil
-}
-func (s MyStoreService) Delete(_ context.Context, _ *v0.DeleteRequest, _ ...client.CallOption) (*v0.DeleteResponse, error) {
-	return nil, nil
-}
-func (s MyStoreService) List(_ context.Context, _ *v0.ListRequest, _ ...client.CallOption) (v0.Store_ListService, error) {
-	return nil, nil
-}
-func (s MyStoreService) Databases(_ context.Context, _ *v0.DatabasesRequest, _ ...client.CallOption) (*v0.DatabasesResponse, error) {
-	return nil, nil
-}
-func (s MyStoreService) Tables(_ context.Context, _ *v0.TablesRequest, _ ...client.CallOption) (*v0.TablesResponse, error) {
-	return nil, nil
-}
-
 func TestSignedURLAuth_validate(t *testing.T) {
 	nowFunc := func() time.Time {
 		t, _ := time.Parse(time.RFC3339, "2020-02-02T12:30:00.000Z")
@@ -198,13 +167,18 @@ func TestSignedURLAuth_validate(t *testing.T) {
 		AllowedHTTPMethods: []string{"get"},
 		Enabled:            true,
 	}
-	store := MyStoreService{}
 	pua := SignedURLAuthenticator{
 		PreSignedURLConfig: cfg,
-		Store:              store,
+		Store:              store.NewMemoryStore(),
 		Now:                nowFunc,
 	}
 
+	pua.Store.Write(&store.Record{
+		Key:      "useri",
+		Value:    []byte("1234567890"),
+		Metadata: nil,
+	})
+
 	tests := []struct {
 		now          string
 		url          string