Refactor switching login type code into app layer and add v4 endpoint (#6000)

* Refactor switching login type code into app layer and add v4 endpoint

* Fix unit test

model/client4.go

@@ -409,6 +409,16 @@ func (c *Client4) Logout() (bool, *Response) {
 	}
 }
 
+// SwitchAccountType changes a user's login type from one type to another.
+func (c *Client4) SwitchAccountType(switchRequest *SwitchRequest) (string, *Response) {
+	if r, err := c.DoApiPost(c.GetUsersRoute()+"/login/switch", switchRequest.ToJson()); err != nil {
+		return "", &Response{StatusCode: r.StatusCode, Error: err}
+	} else {
+		defer closeBody(r)
+		return MapFromJson(r.Body)["follow_link"], BuildResponse(r)
+	}
+}
+
 // User Section
 
 // CreateUser creates a user in the system based on the provided user struct.

model/switch_request.go

@@ -0,0 +1,62 @@
+// Copyright (c) 2017 Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package model
+
+import (
+	"encoding/json"
+	"io"
+)
+
+type SwitchRequest struct {
+	CurrentService string `json:"current_service"`
+	NewService     string `json:"new_service"`
+	Email          string `json:"email"`
+	Password       string `json:"current_password"`
+	NewPassword    string `json:"new_password"`
+	MfaCode        string `json:"mfa_code"`
+	LdapId         string `json:"ldap_id"`
+}
+
+func (o *SwitchRequest) ToJson() string {
+	b, err := json.Marshal(o)
+	if err != nil {
+		return ""
+	} else {
+		return string(b)
+	}
+}
+
+func SwitchRequestFromJson(data io.Reader) *SwitchRequest {
+	decoder := json.NewDecoder(data)
+	var o SwitchRequest
+	err := decoder.Decode(&o)
+	if err == nil {
+		return &o
+	} else {
+		return nil
+	}
+}
+
+func (o *SwitchRequest) EmailToOAuth() bool {
+	return o.CurrentService == USER_AUTH_SERVICE_EMAIL &&
+		(o.NewService == USER_AUTH_SERVICE_SAML ||
+			o.NewService == USER_AUTH_SERVICE_GITLAB ||
+			o.NewService == SERVICE_GOOGLE ||
+			o.NewService == SERVICE_OFFICE365)
+}
+
+func (o *SwitchRequest) OAuthToEmail() bool {
+	return (o.CurrentService == USER_AUTH_SERVICE_SAML ||
+		o.CurrentService == USER_AUTH_SERVICE_GITLAB ||
+		o.CurrentService == SERVICE_GOOGLE ||
+		o.CurrentService == SERVICE_OFFICE365) && o.NewService == USER_AUTH_SERVICE_EMAIL
+}
+
+func (o *SwitchRequest) EmailToLdap() bool {
+	return o.CurrentService == USER_AUTH_SERVICE_EMAIL && o.NewService == USER_AUTH_SERVICE_LDAP
+}
+
+func (o *SwitchRequest) LdapToEmail() bool {
+	return o.CurrentService == USER_AUTH_SERVICE_LDAP && o.NewService == USER_AUTH_SERVICE_EMAIL
+}

model/switch_request_test.go

@@ -0,0 +1,19 @@
+// Copyright (c) 2017 Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package model
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestSwitchRequestJson(t *testing.T) {
+	o := SwitchRequest{Email: NewId(), Password: NewId()}
+	json := o.ToJson()
+	ro := SwitchRequestFromJson(strings.NewReader(json))
+
+	if o.Email != ro.Email {
+		t.Fatal("Emails do not match")
+	}
+}