add permission definition

models/permission.go

@@ -0,0 +1,144 @@
+package models
+
+import (
+	"errors"
+	"log"
+)
+
+type Permission struct {
+	PermissionId int    `db:"PermissionId" json:"permissionId"`
+	Description  string `db:"Description" json:"description"`
+	ReadOnly     bool   `db:"ReadOnly" json:"readOnly"`
+	SafeId       int    `db:"SafeId" json:"safeId"`
+	UserId       int    `db:"UserId" json:"userId"`
+	GroupId      int    `db:"GroupId" json:"groupId"`
+}
+
+// PermissionGetByDesc queries the database for a permission record matching the specified description
+func PermissionGetByDesc(description string) (Permission, error) {
+	var p Permission
+
+	// Query database for matching group object
+	err := db.QueryRowx("SELECT * FROM permissions WHERE Description=?", description).StructScan(&p)
+	if err != nil {
+		return p, errors.New("permission not found")
+	}
+
+	return p, nil
+}
+
+// PermissionGetById queries the database for a permission record matching the specified permission id
+func PermissionGetById(id int) (Permission, error) {
+	var p Permission
+
+	// Query database for matching group object
+	err := db.QueryRowx("SELECT * FROM permissions WHERE PermissionId=?", id).StructScan(&p)
+	if err != nil {
+		return p, errors.New("permission not found")
+	}
+
+	return p, nil
+}
+
+// PermissionList returns a list of all permissions in database
+func PermissionList() ([]Permission, error) {
+	var results []Permission
+
+	// Query database for groups
+	rows, err := db.Queryx("SELECT * FROM permissions")
+
+	if err != nil {
+		log.Printf("PermissionList error executing sql record : '%s'\n", err)
+		return results, err
+	} else {
+		// parse all the results into a slice
+		for rows.Next() {
+			var p Permission
+			err = rows.StructScan(&p)
+			if err != nil {
+				log.Printf("PermissionList error parsing sql record : '%s'\n", err)
+				return results, err
+			}
+			results = append(results, p)
+
+		}
+		log.Printf("PermissionList retrieved '%d' results\n", len(results))
+	}
+
+	return results, nil
+}
+
+// PermissionAdd adds a new permission definition to the database
+func (p *Permission) PermissionAdd() (*Permission, error) {
+	var err error
+	//var check Permission
+	if len(p.Description) > 0 {
+		_, err = PermissionGetByDesc(p.Description)
+	} else {
+		return &Permission{}, errors.New("unable to identify permission with supplied parameters")
+	}
+
+	if err != nil && err.Error() == "permission not found" {
+		log.Printf("PermissionAdd confirmed no existing permission, continuing with creation of permission '%s'\n", p.Description)
+
+		result, err := db.NamedExec(("INSERT INTO permissions (Description, SafeId, UserId, GroupId, ReadOnly) VALUES (:Description, :SafeId, :UserId, :GroupId, :ReadOnly);"), p)
+
+		if err != nil {
+			log.Printf("PermissionAdd error executing sql record : '%s'\n", err)
+			return &Permission{}, err
+		} else {
+			affected, _ := result.RowsAffected()
+			id, _ := result.LastInsertId()
+			p.PermissionId = int(id)
+			log.Printf("PermissionAdd insert returned result id '%d' affecting %d row(s).\n", id, affected)
+		}
+	} else {
+		errString := "permission with identical description already exists"
+		log.Printf("PermissionAdd %s\n", errString)
+		return &Permission{}, errors.New(errString)
+	}
+
+	return p, nil
+}
+
+// PermissionDelete removes a permission definition from the database
+func (p *Permission) PermissionDelete() error {
+	var err error
+	var permission Permission
+
+	// Validate permission exists
+	if p.PermissionId > 0 {
+		permission, err = PermissionGetById(p.PermissionId)
+	} else if len(p.Description) > 0 {
+		permission, err = PermissionGetByDesc(p.Description)
+	} else {
+		errString := "unable to identify permission with supplied parameters"
+		log.Printf("PermissionDelete %s\n", errString)
+		return errors.New(errString)
+	}
+
+	if err != nil && err.Error() == "permission not found" {
+		log.Printf("PermissionDelete unable to validate group exists : '%s'\n", err)
+		return err
+	}
+
+	// Make sure we have a group ID
+	if p.PermissionId == 0 {
+		p.PermissionId = permission.PermissionId
+	}
+
+	// Delete the group
+	log.Printf("PermissionDelete confirmed group exists, continuing with deletion of permission id %d, '%s'\n", p.PermissionId, p.Description)
+	result, err := db.NamedExec((`DELETE FROM permissions WHERE PermissionId = :PermissionId`), p)
+
+	if err != nil {
+		log.Printf("PermissionDelete error executing sql delete : '%s'\n", err)
+		return err
+	} else {
+		affected, _ := result.RowsAffected()
+		id, _ := result.LastInsertId()
+		log.Printf("PermissionDelete returned result id '%d' affecting %d row(s).\n", id, affected)
+	}
+
+	return nil
+}