Implementation of an app provider for Overleaf

.gitignore

@@ -48,4 +48,7 @@ tests/ocis/tests/acceptance/work_tmp
 # drone
 .drone.yml
 
+# air config file
+.air.toml
+
 toolchain/

changelog/unreleased/overleaf.md

@@ -0,0 +1,10 @@
+Enhancement: implementation of an app provider for Overleaf
+
+This PR adds an app provider for Overleaf as a standalone http service. 
+
+The app provider currently consists of support for the export to Overleaf 
+feature, which when called returns a URL to Overleaf that prompts Overleaf 
+to download the appropriate resource making use of the Archiver service, 
+and upload the files to a user's Overleaf account.
+
+https://github.com/cs3org/reva/pull/4084

docs/content/en/docs/config/packages/app/provider/overleaf/_index.md

@@ -0,0 +1,90 @@
+---
+title: "overleaf"
+linkTitle: "overleaf"
+weight: 10
+description: >
+  Configuration for the overleaf service
+---
+
+# _struct: config_
+
+{{% dir name="mime_types" type="[]string" default=nil %}}
+Inherited from the appprovider. [[Ref]](https://github.com/cs3org/reva/tree/master/pkg/app/provider/overleaf/overleaf.go#L69)
+{{< highlight toml >}}
+[app.provider.overleaf]
+mime_types = nil
+{{< /highlight >}}
+{{% /dir %}}
+
+{{% dir name="iop_secret" type="string" default="" %}}
+The IOP secret used to connect to the wopiserver. [[Ref]](https://github.com/cs3org/reva/tree/master/pkg/app/provider/overleaf/overleaf.go#L70)
+{{< highlight toml >}}
+[app.provider.overleaf]
+iop_secret = ""
+{{< /highlight >}}
+{{% /dir %}}
+
+{{% dir name="app_name" type="string" default="" %}}
+The App user-friendly name. [[Ref]](https://github.com/cs3org/reva/tree/master/pkg/app/provider/overleaf/overleaf.go#L71)
+{{< highlight toml >}}
+[app.provider.overleaf]
+app_name = ""
+{{< /highlight >}}
+{{% /dir %}}
+
+{{% dir name="app_icon_uri" type="string" default="" %}}
+A URI to a static asset which represents the app icon. [[Ref]](https://github.com/cs3org/reva/tree/master/pkg/app/provider/overleaf/overleaf.go#L72)
+{{< highlight toml >}}
+[app.provider.overleaf]
+app_icon_uri = ""
+{{< /highlight >}}
+{{% /dir %}}
+
+{{% dir name="folder_base_url" type="string" default="" %}}
+The base URL to generate links to navigate back to the containing folder. [[Ref]](https://github.com/cs3org/reva/tree/master/pkg/app/provider/overleaf/overleaf.go#L73)
+{{< highlight toml >}}
+[app.provider.overleaf]
+folder_base_url = ""
+{{< /highlight >}}
+{{% /dir %}}
+
+{{% dir name="app_url" type="string" default="" %}}
+The App URL. [[Ref]](https://github.com/cs3org/reva/tree/master/pkg/app/provider/overleaf/overleaf.go#L74)
+{{< highlight toml >}}
+[app.provider.overleaf]
+app_url = ""
+{{< /highlight >}}
+{{% /dir %}}
+
+{{% dir name="app_int_url" type="string" default="" %}}
+The internal app URL in case of dockerized deployments. Defaults to AppURL [[Ref]](https://github.com/cs3org/reva/tree/master/pkg/app/provider/overleaf/overleaf.go#L75)
+{{< highlight toml >}}
+[app.provider.overleaf]
+app_int_url = ""
+{{< /highlight >}}
+{{% /dir %}}
+
+{{% dir name="app_api_key" type="string" default="" %}}
+The API key used by the app, if applicable. [[Ref]](https://github.com/cs3org/reva/tree/master/pkg/app/provider/overleaf/overleaf.go#L76)
+{{< highlight toml >}}
+[app.provider.overleaf]
+app_api_key = ""
+{{< /highlight >}}
+{{% /dir %}}
+
+{{% dir name="jwt_secret" type="string" default="" %}}
+The JWT secret to be used to retrieve the token TTL. [[Ref]](https://github.com/cs3org/reva/tree/master/pkg/app/provider/overleaf/overleaf.go#L77)
+{{< highlight toml >}}
+[app.provider.overleaf]
+jwt_secret = ""
+{{< /highlight >}}
+{{% /dir %}}
+
+{{% dir name="app_desktop_only" type="bool" default=false %}}
+Specifies if the app can be opened only on desktop. [[Ref]](https://github.com/cs3org/reva/tree/master/pkg/app/provider/overleaf/overleaf.go#L78)
+{{< highlight toml >}}
+[app.provider.overleaf]
+app_desktop_only = false
+{{< /highlight >}}
+{{% /dir %}}
+

internal/http/services/appprovider/appprovider.go

@@ -371,8 +371,8 @@ func (s *svc) handleOpen(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	if statRes.Info.Type != storagepb.ResourceType_RESOURCE_TYPE_FILE {
-		writeError(w, r, appErrorInvalidParameter, "the given file id does not point to a file", nil)
+	if statRes.Info.Type != storagepb.ResourceType_RESOURCE_TYPE_FILE && statRes.Info.Type != storagepb.ResourceType_RESOURCE_TYPE_CONTAINER {
+		writeError(w, r, appErrorInvalidParameter, "the given file id does not point to a file or a container", nil)
 		return
 	}
 

internal/http/services/loader/loader.go

@@ -29,6 +29,7 @@ import (
 	_ "github.com/cs3org/reva/internal/http/services/metrics"
 	_ "github.com/cs3org/reva/internal/http/services/ocmd"
 	_ "github.com/cs3org/reva/internal/http/services/ocmprovider"
+	_ "github.com/cs3org/reva/internal/http/services/overleaf"
 	_ "github.com/cs3org/reva/internal/http/services/owncloud/ocdav"
 	_ "github.com/cs3org/reva/internal/http/services/owncloud/ocs"
 	_ "github.com/cs3org/reva/internal/http/services/plugins"