#MM-12130 changes for custom service terms (#9450)

* #MM-12130 changes for custom service terms

* Fixed styling

* Added getServiceTerms API

* removed unnecessary panic

* removed custom service terms text from flat config

* reverted user sql store as those changes are no longer needed

* added tests

* Updated a config key to be more standard

* Added copyright info

* Loading service terms only if the feature is enabled

* Loading service terms only if the feature is enabled

* removed unused index

* added createservice termns API

* made a param to bool instead of string

* added createservice termns API

* review fixes

* fixed styling

* Minor refactoring

* removed saveConfig and loadConfig magic

* added empty service terms text check to createServiceTerms API

* refactoed some urls to be terms_of_service instead of service_terms

* removed check for support settings

* changed URLs in tests

* removed unused code

* fixed a bug

* added service termd id in conif

* fixed a test

* review fixes

* minor fixes

* Fixed TestCreateServiceTerms

7 files changed, 218 insertions, 34 deletions

diff --git a/model/client4.go b/model/client4.go
index d9034385b..117f6c570 100644
--- a/model/client4.go
+++ b/model/client4.go
@@ -401,6 +401,14 @@ func (c *Client4) GetRedirectLocationRoute() string {
 	return fmt.Sprintf("/redirect_location")
 }
 
+func (c *Client4) GetRegisterServiceTermsRoute(userId string) string {
+	return c.GetUserRoute(userId) + "/terms_of_service"
+}
+
+func (c *Client4) GetServiceTermsRoute() string {
+	return "/terms_of_service"
+}
+
 func (c *Client4) DoApiGet(url string, etag string) (*http.Response, *AppError) {
 	return c.DoApiRequest(http.MethodGet, c.ApiUrl+url, "", etag)
 }
@@ -3794,3 +3802,38 @@ func (c *Client4) GetRedirectLocation(urlParam, etag string) (string, *Response)
 		return MapFromJson(r.Body)["location"], BuildResponse(r)
 	}
 }
+
+func (c *Client4) RegisterServiceTermsAction(userId, serviceTermsId string, accepted bool) (*bool, *Response) {
+	url := c.GetRegisterServiceTermsRoute(userId)
+	data := map[string]interface{}{"serviceTermsId": serviceTermsId, "accepted": accepted}
+
+	if r, err := c.DoApiPost(url, StringInterfaceToJson(data)); err != nil {
+		return nil, BuildErrorResponse(r, err)
+	} else {
+		defer closeBody(r)
+		return NewBool(CheckStatusOK(r)), BuildResponse(r)
+	}
+}
+
+func (c *Client4) GetServiceTerms(etag string) (*ServiceTerms, *Response) {
+	url := c.GetServiceTermsRoute()
+
+	if r, err := c.DoApiGet(url, etag); err != nil {
+		return nil, BuildErrorResponse(r, err)
+	} else {
+		defer closeBody(r)
+		return ServiceTermsFromJson(r.Body), BuildResponse(r)
+	}
+}
+
+func (c *Client4) CreateServiceTerms(text, userId string) (*ServiceTerms, *Response) {
+	url := c.GetServiceTermsRoute()
+
+	data := map[string]string{"text": text}
+	if r, err := c.DoApiPost(url, MapToJson(data)); err != nil {
+		return nil, BuildErrorResponse(r, err)
+	} else {
+		defer closeBody(r)
+		return ServiceTermsFromJson(r.Body), BuildResponse(r)
+	}
+}
diff --git a/model/config.go b/model/config.go
index db3030170..5e6a676ae 100644
--- a/model/config.go
+++ b/model/config.go
@@ -996,12 +996,13 @@ type PrivacySettings struct {
 }
 
 type SupportSettings struct {
-	TermsOfServiceLink *string
-	PrivacyPolicyLink  *string
-	AboutLink          *string
-	HelpLink           *string
-	ReportAProblemLink *string
-	SupportEmail       *string
+	TermsOfServiceLink        *string
+	PrivacyPolicyLink         *string
+	AboutLink                 *string
+	HelpLink                  *string
+	ReportAProblemLink        *string
+	SupportEmail              *string
+	CustomServiceTermsEnabled *bool
 }
 
 func (s *SupportSettings) SetDefaults() {
@@ -1048,6 +1049,10 @@ func (s *SupportSettings) SetDefaults() {
 	if s.SupportEmail == nil {
 		s.SupportEmail = NewString(SUPPORT_SETTINGS_DEFAULT_SUPPORT_EMAIL)
 	}
+
+	if s.CustomServiceTermsEnabled == nil {
+		s.CustomServiceTermsEnabled = NewBool(false)
+	}
 }
 
 type AnnouncementSettings struct {
diff --git a/model/license.go b/model/license.go
index 05db063e2..c30fecf71 100644
--- a/model/license.go
+++ b/model/license.go
@@ -55,6 +55,7 @@ type Features struct {
 	DataRetention             *bool `json:"data_retention"`
 	MessageExport             *bool `json:"message_export"`
 	CustomPermissionsSchemes  *bool `json:"custom_permissions_schemes"`
+	CustomTermsOfService      *bool `json:"custom_terms_of_service"`
 
 	// after we enabled more features for webrtc we'll need to control them with this
 	FutureFeatures *bool `json:"future_features"`
@@ -152,6 +153,10 @@ func (f *Features) SetDefaults() {
 	if f.CustomPermissionsSchemes == nil {
 		f.CustomPermissionsSchemes = NewBool(*f.FutureFeatures)
 	}
+
+	if f.CustomTermsOfService == nil {
+		f.CustomTermsOfService = NewBool(*f.FutureFeatures)
+	}
 }
 
 func (l *License) IsExpired() bool {
diff --git a/model/service_terms.go b/model/service_terms.go
new file mode 100644
index 000000000..64ecabf31
--- /dev/null
+++ b/model/service_terms.go
@@ -0,0 +1,70 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package model
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"unicode/utf8"
+)
+
+// we only ever need the latest version of service terms
+const SERVICE_TERMS_CACHE_SIZE = 1
+
+type ServiceTerms struct {
+	Id       string `json:"id"`
+	CreateAt int64  `json:"create_at"`
+	UserId   string `json:"user_id"`
+	Text     string `json:"text"`
+}
+
+func (t *ServiceTerms) IsValid() *AppError {
+	if len(t.Id) != 26 {
+		return InvalidServiceTermsError("id", "")
+	}
+
+	if t.CreateAt == 0 {
+		return InvalidServiceTermsError("create_at", t.Id)
+	}
+
+	if len(t.UserId) != 26 {
+		return InvalidServiceTermsError("user_id", t.Id)
+	}
+
+	if utf8.RuneCountInString(t.Text) > POST_MESSAGE_MAX_RUNES_V2 {
+		return InvalidServiceTermsError("text", t.Id)
+	}
+
+	return nil
+}
+
+func (t *ServiceTerms) ToJson() string {
+	b, _ := json.Marshal(t)
+	return string(b)
+}
+
+func ServiceTermsFromJson(data io.Reader) *ServiceTerms {
+	var serviceTerms *ServiceTerms
+	json.NewDecoder(data).Decode(&serviceTerms)
+	return serviceTerms
+}
+
+func InvalidServiceTermsError(fieldName string, serviceTermsId string) *AppError {
+	id := fmt.Sprintf("model.term.is_valid.%s.app_error", fieldName)
+	details := ""
+	if serviceTermsId != "" {
+		details = "service_terms_id=" + serviceTermsId
+	}
+	return NewAppError("ServiceTerms.IsValid", id, nil, details, http.StatusBadRequest)
+}
+
+func (t *ServiceTerms) PreSave() {
+	if t.Id == "" {
+		t.Id = NewId()
+	}
+
+	t.CreateAt = GetMillis()
+}
diff --git a/model/service_terms_test.go b/model/service_terms_test.go
new file mode 100644
index 000000000..89b8ff9b5
--- /dev/null
+++ b/model/service_terms_test.go
@@ -0,0 +1,62 @@
+// Copyright (c) 2016-present Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package model
+
+import (
+	"github.com/stretchr/testify/assert"
+	"strings"
+	"testing"
+)
+
+func TestServiceTermsIsValid(t *testing.T) {
+	s := ServiceTerms{}
+
+	if err := s.IsValid(); err == nil {
+		t.Fatal("should be invalid")
+	}
+
+	s.Id = NewId()
+	if err := s.IsValid(); err == nil {
+		t.Fatal("should be invalid")
+	}
+
+	s.CreateAt = GetMillis()
+	if err := s.IsValid(); err == nil {
+		t.Fatal("should be invalid")
+	}
+
+	s.UserId = NewId()
+	if err := s.IsValid(); err != nil {
+		t.Fatal("should be invalid")
+	}
+
+	s.Text = strings.Repeat("0", POST_MESSAGE_MAX_RUNES_V2+1)
+	if err := s.IsValid(); err == nil {
+		t.Fatal("should be invalid")
+	}
+
+	s.Text = strings.Repeat("0", POST_MESSAGE_MAX_RUNES_V2)
+	if err := s.IsValid(); err != nil {
+		t.Fatal(err)
+	}
+
+	s.Text = "test"
+	if err := s.IsValid(); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestServiceTermsJson(t *testing.T) {
+	o := ServiceTerms{
+		Id:       NewId(),
+		Text:     NewId(),
+		CreateAt: GetMillis(),
+		UserId:   NewId(),
+	}
+	j := o.ToJson()
+	ro := ServiceTermsFromJson(strings.NewReader(j))
+
+	assert.NotNil(t, ro)
+	assert.Equal(t, o, *ro)
+}
diff --git a/model/session_test.go b/model/session_test.go
index 88e0bdd43..fb89f8963 100644
--- a/model/session_test.go
+++ b/model/session_test.go
@@ -76,5 +76,3 @@ func TestSessionCSRF(t *testing.T) {
 	assert.NotEmpty(t, token2)
 	assert.Equal(t, token, token2)
 }
-
-
diff --git a/model/user.go b/model/user.go
index c7ba6b9cb..2b5092cfb 100644
--- a/model/user.go
+++ b/model/user.go
@@ -48,32 +48,33 @@ const (
 )
 
 type User struct {
-	Id                 string    `json:"id"`
-	CreateAt           int64     `json:"create_at,omitempty"`
-	UpdateAt           int64     `json:"update_at,omitempty"`
-	DeleteAt           int64     `json:"delete_at"`
-	Username           string    `json:"username"`
-	Password           string    `json:"password,omitempty"`
-	AuthData           *string   `json:"auth_data,omitempty"`
-	AuthService        string    `json:"auth_service"`
-	Email              string    `json:"email"`
-	EmailVerified      bool      `json:"email_verified,omitempty"`
-	Nickname           string    `json:"nickname"`
-	FirstName          string    `json:"first_name"`
-	LastName           string    `json:"last_name"`
-	Position           string    `json:"position"`
-	Roles              string    `json:"roles"`
-	AllowMarketing     bool      `json:"allow_marketing,omitempty"`
-	Props              StringMap `json:"props,omitempty"`
-	NotifyProps        StringMap `json:"notify_props,omitempty"`
-	LastPasswordUpdate int64     `json:"last_password_update,omitempty"`
-	LastPictureUpdate  int64     `json:"last_picture_update,omitempty"`
-	FailedAttempts     int       `json:"failed_attempts,omitempty"`
-	Locale             string    `json:"locale"`
-	Timezone           StringMap `json:"timezone"`
-	MfaActive          bool      `json:"mfa_active,omitempty"`
-	MfaSecret          string    `json:"mfa_secret,omitempty"`
-	LastActivityAt     int64     `db:"-" json:"last_activity_at,omitempty"`
+	Id                     string    `json:"id"`
+	CreateAt               int64     `json:"create_at,omitempty"`
+	UpdateAt               int64     `json:"update_at,omitempty"`
+	DeleteAt               int64     `json:"delete_at"`
+	Username               string    `json:"username"`
+	Password               string    `json:"password,omitempty"`
+	AuthData               *string   `json:"auth_data,omitempty"`
+	AuthService            string    `json:"auth_service"`
+	Email                  string    `json:"email"`
+	EmailVerified          bool      `json:"email_verified,omitempty"`
+	Nickname               string    `json:"nickname"`
+	FirstName              string    `json:"first_name"`
+	LastName               string    `json:"last_name"`
+	Position               string    `json:"position"`
+	Roles                  string    `json:"roles"`
+	AllowMarketing         bool      `json:"allow_marketing,omitempty"`
+	Props                  StringMap `json:"props,omitempty"`
+	NotifyProps            StringMap `json:"notify_props,omitempty"`
+	LastPasswordUpdate     int64     `json:"last_password_update,omitempty"`
+	LastPictureUpdate      int64     `json:"last_picture_update,omitempty"`
+	FailedAttempts         int       `json:"failed_attempts,omitempty"`
+	Locale                 string    `json:"locale"`
+	Timezone               StringMap `json:"timezone"`
+	MfaActive              bool      `json:"mfa_active,omitempty"`
+	MfaSecret              string    `json:"mfa_secret,omitempty"`
+	LastActivityAt         int64     `db:"-" json:"last_activity_at,omitempty"`
+	AcceptedServiceTermsId string    `json:"accepted_service_terms_id,omitempty"`
 }
 
 type UserPatch struct {