added user independent sections and started db migration work

pkg/db/section.go

@@ -0,0 +1,103 @@
+// Copyright (C) 2019 Marius Schellenberger
+
+package db
+
+import (
+	"errors"
+	"git.giftfish.de/ston1th/gowiki/pkg/core"
+	"git.giftfish.de/ston1th/gowiki/pkg/log"
+	"sort"
+	"strings"
+)
+
+const sectionPrefix = "section/"
+
+var (
+	errSectionExists = errors.New("db: section already exist")
+)
+
+func (db *DB) GetSections() (secs core.Sections, err error) {
+	err = db.store.ForEach(func(k string, _ []byte) error {
+		if trim, ok := hasTrimPrefix(k, sectionPrefix); ok {
+			s, err := db.GetSection(trim)
+			if err == nil {
+				secs = append(secs, s)
+			}
+		}
+		return nil
+	})
+	sort.Sort(secs)
+	return
+}
+
+func (db *DB) GetSection(section string) (s core.Section, err error) {
+	err = db.store.Get(sectionPrefix+section, &s)
+	return
+}
+
+func (db *DB) SectionExists(section string) error {
+	return db.store.Get(sectionPrefix+section, nil)
+}
+
+func (db *DB) CreateSection(section string, members []string, user bool) error {
+	section = userRe.ReplaceAllString(section, "")
+	if err := db.SectionExists(section); err == nil {
+		return errSectionExists
+	}
+	return db.UpdateSection(section, members, user)
+}
+
+func (db *DB) UpdateSection(section string, members []string, user bool) error {
+	section = userRe.ReplaceAllString(section, "")
+	if _, ok := core.Contains(section, reservedNames); ok {
+		return errNameReserved
+	}
+	var m []string
+	if user {
+		m = append(m, section)
+	} else {
+		for _, v := range members {
+			if v == "" {
+				continue
+			}
+			if err := db.UserExists(v); err == nil {
+				m = append(m, v)
+			}
+		}
+	}
+	return db.store.Set(sectionPrefix+section, &core.Section{section, user, m})
+}
+
+func (db *DB) DeleteSection(section string, user bool) error {
+	if section == core.WikiSection {
+		return errors.New("section '" + core.WikiSection + "' cannot be deleted")
+	}
+	s, err := db.GetSection(section)
+	if err != nil {
+		return err
+	}
+	err = db.store.Delete(sectionPrefix + section)
+	if err != nil {
+		return err
+	}
+	if !s.User && !user {
+		return nil
+	}
+	section += "/"
+	var pages []string
+	db.store.ForEach(func(k string, _ []byte) error {
+		if trim, ok := hasTrimPrefix(k, pagePrefix); ok {
+			if strings.HasPrefix(trim, section) {
+				pages = append(pages, trim)
+			}
+		}
+		return nil
+	})
+	for _, p := range pages {
+		err := db.deletePage(p)
+		if err != nil {
+			log.Debugf("DeleteSection %s, %s", section, err)
+		}
+	}
+	return nil
+}