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

api4/plugin.go

@@ -7,6 +7,7 @@ package api4
 
 import (
 	"bytes"
+	"encoding/json"
 	"io/ioutil"
 	"net/http"
 	"net/url"
@@ -36,6 +37,8 @@ func (api *API) InitPlugin() {
 	api.BaseRoutes.Plugin.Handle("/disable", api.ApiSessionRequired(disablePlugin)).Methods("POST")
 
 	api.BaseRoutes.Plugins.Handle("/webapp", api.ApiHandler(getWebappPlugins)).Methods("GET")
+
+	api.BaseRoutes.Plugins.Handle("/marketplace", api.ApiSessionRequired(getMarketplacePlugins)).Methods("GET")
 }
 
 func uploadPlugin(c *Context, w http.ResponseWriter, r *http.Request) {
@@ -239,6 +242,43 @@ func getWebappPlugins(c *Context, w http.ResponseWriter, r *http.Request) {
 	w.Write([]byte(model.ManifestListToJson(clientManifests)))
 }
 
+func getMarketplacePlugins(c *Context, w http.ResponseWriter, r *http.Request) {
+	if !*c.App.Config().PluginSettings.Enable {
+		c.Err = model.NewAppError("getMarketplacePlugins", "app.plugin.disabled.app_error", nil, "", http.StatusNotImplemented)
+		return
+	}
+
+	if !*c.App.Config().PluginSettings.EnableMarketplace {
+		c.Err = model.NewAppError("getMarketplacePlugins", "app.plugin.marketplace_disabled.app_error", nil, "", http.StatusNotImplemented)
+		return
+	}
+
+	if !c.App.SessionHasPermissionTo(c.App.Session, model.PERMISSION_MANAGE_SYSTEM) {
+		c.SetPermissionError(model.PERMISSION_MANAGE_SYSTEM)
+		return
+	}
+
+	filter, err := parseMarketplacePluginFilter(r.URL)
+	if err != nil {
+		c.Err = model.NewAppError("getMarketplacePlugins", "app.plugin.marshal.app_error", nil, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	plugins, appErr := c.App.GetMarketplacePlugins(filter)
+	if appErr != nil {
+		c.Err = appErr
+		return
+	}
+
+	json, err := json.Marshal(plugins)
+	if err != nil {
+		c.Err = model.NewAppError("getMarketplacePlugins", "app.plugin.marshal.app_error", nil, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	w.Write(json)
+}
+
 func enablePlugin(c *Context, w http.ResponseWriter, r *http.Request) {
 	c.RequirePluginId()
 	if c.Err != nil {
@@ -286,3 +326,25 @@ func disablePlugin(c *Context, w http.ResponseWriter, r *http.Request) {
 
 	ReturnStatusOK(w)
 }
+
+func parseMarketplacePluginFilter(u *url.URL) (*model.MarketplacePluginFilter, error) {
+	page, err := parseInt(u, "page", 0)
+	if err != nil {
+		return nil, err
+	}
+
+	perPage, err := parseInt(u, "per_page", 100)
+	if err != nil {
+		return nil, err
+	}
+
+	filter := u.Query().Get("filter")
+	serverVersion := u.Query().Get("server_version")
+
+	return &model.MarketplacePluginFilter{
+		Page:          page,
+		PerPage:       perPage,
+		Filter:        filter,
+		ServerVersion: serverVersion,
+	}, nil
+}