mirror of
https://github.com/wahyd4/golink.git
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Will Norris
41c8dbe5b1
This is a straight refactor with no functional changes. All file access is captured in the FileDB type. The DB interface is not strictly necessary here since we only have a single implementation, but helped to keep the API clean, which will be useful in a future sqlite migration. Change-Id: I9b86db3040e2618a4ffef237369288ccfc10bc1e
106 lines
2.5 KiB
Go
106 lines
2.5 KiB
Go
package main
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import (
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"encoding/json"
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"fmt"
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"net/url"
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"os"
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"path/filepath"
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"strings"
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"time"
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)
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// Link is the structure stored for each go short link.
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type Link struct {
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Short string // the "foo" part of http://go/foo
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Long string // the target URL or text/template pattern to run
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Created time.Time
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LastEdit time.Time // when the link was last edited
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Owner string // user@domain
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}
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// DB provides storage for Links.
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type DB interface {
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// List the short name of all stored Links.
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List() ([]string, error)
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// Load a Link by its short name. It returns fs.ErrNotExist if the link does not exist.
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Load(short string) (*Link, error)
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// Save a Link.
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Save(link *Link) error
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}
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// FileDB stores Links in JSON files on disk.
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type FileDB struct {
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// dir is the directory to store one JSON file per link.
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dir string
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}
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// NewFileDB returns a new FileDB which will store links in individual JSON
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// files in the specified directory. If mkdir is true, the directory will be
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// created if it does not exist.
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func NewFileDB(dir string, mkdir bool) (*FileDB, error) {
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if mkdir {
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if err := os.MkdirAll(dir, 0755); err != nil {
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return nil, err
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}
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}
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if fi, err := os.Stat(dir); err != nil {
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return nil, err
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} else if !fi.IsDir() {
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return nil, fmt.Errorf("%q is not a directory", dir)
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}
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return &FileDB{dir: dir}, nil
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}
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// linkPath returns the path to the file on disk for the specified link. Short
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// name is normalized to be case insensitive, remove dashes, and escape some
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// characters.
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//
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// TODO(willnorris): some of this normalization is not unique to FileDB and
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// should be moved elsewhere
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func (f *FileDB) linkPath(short string) string {
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name := url.PathEscape(strings.ToLower(short))
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name = strings.ReplaceAll(name, "-", "")
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name = strings.ReplaceAll(name, ".", "%2e")
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return filepath.Join(f.dir, name)
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}
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func (f *FileDB) List() ([]string, error) {
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d, err := os.Open(f.dir)
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if err != nil {
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return nil, err
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}
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defer d.Close()
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names, err := d.Readdirnames(0)
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if err != nil {
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return nil, err
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}
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return names, nil
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}
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func (f *FileDB) Load(short string) (*Link, error) {
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data, err := os.ReadFile(f.linkPath(short))
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if err != nil {
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return nil, err
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}
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link := new(Link)
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if err := json.Unmarshal(data, link); err != nil {
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return nil, err
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}
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return link, nil
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}
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func (f *FileDB) Save(link *Link) error {
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j, err := json.MarshalIndent(link, "", " ")
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if err != nil {
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return err
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}
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if err := os.WriteFile(f.linkPath(link.Short), j, 0600); err != nil {
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return err
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}
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return nil
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}
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