MM-17023: Plugin Marketplace (#12183)

* MM-17149 - Extend config.json for marketplace settings (#11933)

* MM-17149 - Extend config.json for marketplace settings

* Renamed MarketplaceUrl, tracking default marketplace url

* Added EnableMarketplace to the client config

* Revert "Added EnableMarketplace to the client config"

This reverts commit 0f982c4c661c2cd9bb96264e9a01a2363c40d9c5.

* MM-17149 - Added EnableMarketplace to the client config (#11958)

* Added EnableMarketplace to the client config

* Moved EnableMarketplace setting out of limited client configuration

* MM-17150, MM-17545, MM-18100 - Implement GET /api/v4/plugins/m… (#11977)

* MM-17150 - Implement GET /api/v4/plugins/marketplace proxying upstream
MM-17545 - Merge locally installed plugins into GET /api/v4/plugins/marketplace

* Replaced MarketplacePluginState with Installed

* Setting InstalledVersion instead of Installed

* marketplace client setting per_page if non zero

* Creating insecure client for marketplace url

* Fixed trailing slash for default marketplace url

* Adding filtering

* Fixed function names

* Renamed Manifest() to GetManifest(), added godoc for BaseMarketplacePlugin

* Handling plugin.ErrNotFound correctly

* Checking err == nil instead when a plugin is installed

* MM-18450 - Local-only plugin search (#12152)

* MM-17846: plugin icons (#12157)

* MM-17846: add support for plugin icons

Extend the model definitions to support plugin icons from the marketplace.

* s/IconURL/IconData

* MM-18475 - Converge on snake_case responses from the marketplace (#12179)

* MM-18520 - MM-Server should forward server version to marketplace server (#12181)

* Renamed request to filter client4.GetMarketplacePlugins

* Renamed request to filter

* Guarding against bad marketplace server response

plugin/environment.go

@@ -18,6 +18,8 @@ import (
 	"github.com/pkg/errors"
 )
 
+var ErrNotFound = errors.New("Item not found")
+
 type apiImplCreatorFunc func(*model.Manifest) API
 
 // registeredPlugin stores the state for a given plugin that has been activated
@@ -162,6 +164,23 @@ func (env *Environment) Statuses() (model.PluginStatuses, error) {
 	return pluginStatuses, nil
 }
 
+// GetManifest returns a manifest for a given pluginId.
+// Returns ErrNotFound if plugin is not found.
+func (env *Environment) GetManifest(pluginId string) (*model.Manifest, error) {
+	plugins, err := env.Available()
+	if err != nil {
+		return nil, errors.Wrap(err, "unable to get plugin statuses")
+	}
+
+	for _, plugin := range plugins {
+		if plugin.Manifest != nil && plugin.Manifest.Id == pluginId {
+			return plugin.Manifest, nil
+		}
+	}
+
+	return nil, ErrNotFound
+}
+
 func (env *Environment) Activate(id string) (manifest *model.Manifest, activated bool, reterr error) {
 	// Check if we are already active
 	if env.IsActive(id) {