[MM-25652] Add /integrity endpoint to local mode API (#15033)

* Fix direct/group channel false positives

* Move public structures to model package

* Expose CheckIntegrity as a local API method

* Remove extra file

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

model/client4.go

@@ -5357,3 +5357,18 @@ func (c *Client4) UpdateSidebarCategoryForTeamForUser(userID, teamID, categoryID
 
 	return cat, BuildResponse(r)
 }
+
+// CheckIntegrity performs a database integrity check.
+func (c *Client4) CheckIntegrity() ([]IntegrityCheckResult, *Response) {
+	r, err := c.DoApiPost("/integrity", "")
+	if err != nil {
+		return nil, BuildErrorResponse(r, err)
+	}
+	defer closeBody(r)
+	var results []IntegrityCheckResult
+	if err := json.NewDecoder(r.Body).Decode(&results); err != nil {
+		appErr := NewAppError("Api4.CheckIntegrity", "api.marshal_error", nil, err.Error(), http.StatusInternalServerError)
+		return nil, BuildErrorResponse(r, appErr)
+	}
+	return results, BuildResponse(r)
+}

model/integrity.go

@@ -0,0 +1,58 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package model
+
+import (
+	"encoding/json"
+	"errors"
+)
+
+type OrphanedRecord struct {
+	ParentId *string `json:"parent_id"`
+	ChildId  *string `json:"child_id"`
+}
+
+type RelationalIntegrityCheckData struct {
+	ParentName   string           `json:"parent_name"`
+	ChildName    string           `json:"child_name"`
+	ParentIdAttr string           `json:"parent_id_attr"`
+	ChildIdAttr  string           `json:"child_id_attr"`
+	Records      []OrphanedRecord `json:"records"`
+}
+
+type IntegrityCheckResult struct {
+	Data interface{} `json:"data"`
+	Err  error       `json:"err"`
+}
+
+func (r *IntegrityCheckResult) UnmarshalJSON(b []byte) error {
+	var data map[string]interface{}
+	if err := json.Unmarshal(b, &data); err != nil {
+		return err
+	}
+	if d, ok := data["data"]; ok && d != nil {
+		var rdata RelationalIntegrityCheckData
+		m := d.(map[string]interface{})
+		rdata.ParentName = m["parent_name"].(string)
+		rdata.ChildName = m["child_name"].(string)
+		rdata.ParentIdAttr = m["parent_id_attr"].(string)
+		rdata.ChildIdAttr = m["child_id_attr"].(string)
+		for _, recData := range m["records"].([]interface{}) {
+			var record OrphanedRecord
+			m := recData.(map[string]interface{})
+			if val := m["parent_id"]; val != nil {
+				record.ParentId = NewString(val.(string))
+			}
+			if val := m["child_id"]; val != nil {
+				record.ChildId = NewString(val.(string))
+			}
+			rdata.Records = append(rdata.Records, record)
+		}
+		r.Data = rdata
+	}
+	if err, ok := data["err"]; ok && err != nil {
+		r.Err = errors.New(data["err"].(string))
+	}
+	return nil
+}