[WIP] [MM-55031] OAuth Outgoing Connection App integration (#25379)

* OAuthOutgoingConnection model

* added store

* make generated

* add missing license headers

* fix receiver name

* i18n

* i18n sorting

* update migrations from master

* make migrations-extract

* update retrylayer tests

* replaced sql query with id pagination

* fixed flaky tests

* missing columns

* missing columns on save/update

* typo

* improved tests

* remove enum from mysql colum

* add password credentials to store

* license changes

* OAuthOutgoingConnectionInterface

* Oauth -> OAuth

* make generated

* merge migrations

* renamed migrations

* model change suggestions

* refactor test functionsn

* migration typo

* refactor store table names

* updated sanitize test

* cleanup merge

* refactor symbol

* list endpoint

* oauthoutgoingconnection -> outgoingoauthconnection

* signature change

* i18n update

* granttype typo

* naming

* api list

* uppercase typo

* i18n

* missing license header

* fixed path in comments

* updated openapi definitions

* sanitize connections

* make generated

* test license and no feature flag

* removed t.fatal

* updated testhelper calls

* yaml schema fixes

* switched interface name

* suggested translation

* missing i18n translation

* address comments

* updated i18n

server/public/model/client4.go

@@ -471,6 +471,14 @@ func (c *Client4) oAuthAppRoute(appId string) string {
 	return fmt.Sprintf("/oauth/apps/%v", appId)
 }
 
+func (c *Client4) outgoingOAuthConnectionsRoute() string {
+	return "/oauth/outgoing_connections"
+}
+
+func (c *Client4) outgoingOAuthConnectionRoute(id string) string {
+	return fmt.Sprintf("/oauth/outgoing_connections/%s", id)
+}
+
 func (c *Client4) jobsRoute() string {
 	return "/jobs"
 }
@@ -6003,6 +6011,36 @@ func (c *Client4) GetOAuthAccessToken(ctx context.Context, data url.Values) (*Ac
 	return ar, BuildResponse(rp), nil
 }
 
+// OutgoingOAuthConnection section
+
+// GetOutgoingOAuthConnections retrieves the outgoing OAuth connections.
+func (c *Client4) GetOutgoingOAuthConnections(ctx context.Context, fromID string, limit int) ([]*OutgoingOAuthConnection, *Response, error) {
+	r, err := c.DoAPIGet(ctx, c.outgoingOAuthConnectionsRoute(), "")
+	if err != nil {
+		return nil, BuildResponse(r), err
+	}
+	defer closeBody(r)
+	var connections []*OutgoingOAuthConnection
+	if err := json.NewDecoder(r.Body).Decode(&connections); err != nil {
+		return nil, nil, NewAppError("GetOutgoingOAuthConnections", "api.unmarshal_error", nil, "", http.StatusInternalServerError).Wrap(err)
+	}
+	return connections, BuildResponse(r), nil
+}
+
+// GetOutgoingOAuthConnection retrieves the outgoing OAuth connection with the given ID.
+func (c *Client4) GetOutgoingOAuthConnection(ctx context.Context, id string) (*OutgoingOAuthConnection, *Response, error) {
+	r, err := c.DoAPIGet(ctx, c.outgoingOAuthConnectionRoute(id), "")
+	if err != nil {
+		return nil, BuildResponse(r), err
+	}
+	defer closeBody(r)
+	var connection *OutgoingOAuthConnection
+	if err := json.NewDecoder(r.Body).Decode(&connection); err != nil {
+		return nil, nil, NewAppError("GetOutgoingOAuthConnection", "api.unmarshal_error", nil, "", http.StatusInternalServerError).Wrap(err)
+	}
+	return connection, BuildResponse(r), nil
+}
+
 // Elasticsearch Section
 
 // TestElasticsearch will attempt to connect to the configured Elasticsearch server and return OK if configured.