424 lines
8.6 KiB
Go
424 lines
8.6 KiB
Go
package main
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import (
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"log"
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"fmt"
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"flag"
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"strconv"
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"strings"
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"math/rand"
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//"net/url"
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"net/http"
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"database/sql"
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"html/template"
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"path/filepath"
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_ "github.com/mattn/go-sqlite3"
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)
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var errlog *log.Logger = nil
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var db *sql.DB = nil
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var options Options = Options{}
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var NoSuchComicErr Err = Err{msg: "no such comic found"}
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const dbSquema string = `
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CREATE TABLE IF NOT EXISTS comic (
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id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
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datetime DATETIME DEFAULT CURRENT_TIMESTAMP,
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title CHAR(50),
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image CHAR(200),
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description TEXT,
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tags TEXT
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);`
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type Options struct {
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DBPath string
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MediaPath string
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TemplatesPath string
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Address string
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Port int
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Publish bool
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Title string
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ImagePath string
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}
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type Comic struct {
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ID int
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DateTime string
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Title string
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Image string
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Description string
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Tags string
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}
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type Context struct {
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Comics []struct{
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No int
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Title string
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Date string
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}
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Comic *Comic
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Current int
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Previous int
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Combo int
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Next int
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First int
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Last int
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Title string
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}
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type Err struct {
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msg string
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}
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func (o * Options) Parse() error {
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flag.StringVar(&o.DBPath, "d", "./db.sqlite", "Sets path to database file")
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flag.StringVar(&o.MediaPath, "m", "./media/", "Sets path to media directory")
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flag.StringVar(&o.TemplatesPath, "t", "./templates/", "Sets path to templates directory")
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flag.StringVar(&o.Address, "a", "127.0.0.1", "Defines the address the web server will listen to")
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flag.IntVar(&o.Port, "p", 8080, "Defines the port the web server will listen to")
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flag.BoolVar(&o.Publish, "u", false, "Creates new commics. Needs both -i and -l")
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flag.StringVar(&o.Title, "l", "", "Title for new comic")
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flag.StringVar(&o.ImagePath, "i", "", "Image path for new comic")
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flag.Parse()
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return nil
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}
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func (e * Err) Error() string {
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return e.msg
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}
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func (e * Err) With(i string) Err {
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return Err{msg:fmt.Sprintf("%s with %s", e.msg, i)}
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}
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func (c *Comic) readRow(db * sql.Rows) error {
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return db.Scan(&c.ID, &c.DateTime, &c.Title, &c.Image,
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&c.Description, &c.Tags)
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}
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func getComic(id int) (*Comic, error) {
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c := new(Comic)
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nferr := NoSuchComicErr.With(fmt.Sprintf("id \"%d\"", id))
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if id < 0 {
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return c, &nferr
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}
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comics, err := allComics()
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if err != nil {
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return c, err
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}
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if len(comics) <= id {
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return c, &nferr
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}
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*c = comics[id]
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return c, err
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}
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func readRows(rows *sql.Rows) ([]Comic, error) {
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comics := []Comic{}
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for rows.Next() {
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c := Comic{}
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err := c.readRow(rows)
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if err != nil {
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return comics, nil
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}
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comics = append(comics, c)
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}
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return comics, nil
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}
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func allComics() ([]Comic, error) {
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rows, err := db.Query("SELECT * FROM comic ORDER BY datetime ASC")
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if err != nil {
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return nil, err
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}
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defer rows.Close()
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return readRows(rows)
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}
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func executeMainTemplate(w http.ResponseWriter, context * Context) error {
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t, err := template.ParseFiles(filepath.Join(options.TemplatesPath, "comic.html"))
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if err != nil {
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return err
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}
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tmp := new(strings.Builder)
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err = t.Execute(tmp, context)
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if err != nil {
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return err
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}
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_, err = w.Write([]byte(tmp.String()))
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return err
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}
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func comicView(w http.ResponseWriter, r * http.Request) {
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var err error
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path := strings.TrimPrefix(r.URL.Path, "/")
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if len(path) >= 5 {
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path = path[:5]
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}
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defer func() {
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if err != nil {
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errlog.Println(err)
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return404(w,r)
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return
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}
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}()
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c := &Comic{}
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context := Context{
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Comics: nil,
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Comic: c,
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Title: "Black Ram Comics",
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}
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i := 1
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if len(path) > 0{
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i, err = strconv.Atoi(path)
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if err != nil {
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return
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}
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}
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context.Current = i
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c, err = getComic(i-1)
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if err != nil {
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errlog.Println(err)
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return404(w,r)
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err = nil
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return
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}
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context.Comic = c
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context.Title = fmt.Sprintf("Black Ram Comics: %s", c.Title)
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comics, err := allComics()
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if err != nil {
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return500(w,r)
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err = nil
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return
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}
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context.First = 1
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context.Last = len(comics)
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context.Previous = i
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if i > 1 {
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context.Previous = i - 1
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}
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context.Next = i
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if i < (len(comics)) {
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context.Next = i + 1
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}
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err = executeMainTemplate(w, &context)
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}
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func allView(w http.ResponseWriter, r * http.Request) {
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var err error
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defer func() {
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if err != nil {
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errlog.Println(err)
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return500(w,r)
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err = nil
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return
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}
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} ()
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context := Context{
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Comics: nil,
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Title: "All Issues",
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}
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comics, err := allComics()
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if err != nil {
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return
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}
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for i, comic := range comics {
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context.Comics = append(context.Comics, struct {
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No int
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Title string
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Date string
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}{
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Title: comic.Title,
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No: i+1,
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Date: comic.DateTime,
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})
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}
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err = executeMainTemplate(w, &context)
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}
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func latestView(w http.ResponseWriter, r * http.Request) {
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comics, err := allComics()
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if err != nil {
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return500(w, r)
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}
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if len(comics) < 1 {
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return404(w, r)
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} else {
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r.URL.Path = fmt.Sprintf("/%d", len(comics)-1)
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comicView(w, r)
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}
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}
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func firstView(w http.ResponseWriter, r * http.Request) {
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comics, err := allComics()
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if err != nil {
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return500(w, r)
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}
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if len(comics) < 1 {
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return404(w, r)
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} else {
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r.URL.Path = fmt.Sprintf("/0")
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comicView(w, r)
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}
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}
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func randomView(w http.ResponseWriter, r * http.Request) {
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comics, err := allComics()
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if err != nil {
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errlog.Println(err)
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return500(w, r)
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return
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}
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if len(comics) < 1 {
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return404(w, r)
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} else {
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r.URL.Path = fmt.Sprintf("/%d", rand.Intn(len(comics))+1)
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comicView(w, r)
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}
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}
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// Taken from: https://gist.github.com/hoitomt/c0663af8c9443f2a8294
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func logRequest(handler http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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log.Printf("%s %s %s\n", r.RemoteAddr, r.Method, r.URL)
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handler.ServeHTTP(w, r)
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})
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}
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func returnPlainText(w http.ResponseWriter, t string) error {
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w.Header().Set("Content-Type", "text/plain")
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_, err := w.Write([]byte(t))
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return err
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}
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func returnError(w http.ResponseWriter, r * http.Request, status int) {
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var err error
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msg := fmt.Sprintf("%d", status)
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w.WriteHeader(status)
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defer func() {
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if err != nil {
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returnPlainText(w, msg)
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}
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}()
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t, err := template.ParseFiles(filepath.Join(options.TemplatesPath, "error.html"))
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if err != nil {
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return
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}
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c := struct {
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Code string
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Title string
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}{
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Code: msg,
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Title: "BRC: " + msg,
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}
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err = t.Execute(w, &c)
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}
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func return404(w http.ResponseWriter, r * http.Request) {
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returnError(w, r, http.StatusNotFound)
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}
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func return500(w http.ResponseWriter, r * http.Request) {
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returnError(w, r, http.StatusInternalServerError)
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}
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func newComic(title string, image string, description string, tags string) error {
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_, err := db.Exec("INSERT INTO comic(title, image, description, tags) VALUES(?, ?, ?, ?);",
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title, image, description, tags)
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return err
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}
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func main() {
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var err error
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errlog = log.New(log.Writer(), "[ERROR] ", log.Flags())
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options.Parse()
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log.Println("using database path \"" + options.DBPath + "\"")
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db, err = sql.Open("sqlite3", options.DBPath)
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if err != nil {
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log.Fatal(err)
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}
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defer db.Close()
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_, err = db.Exec(dbSquema)
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if err != nil {
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log.Fatal(err)
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}
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if options.Publish {
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if len(options.ImagePath) < 1 {
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panic("missing -i")
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}
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if len(options.Title) < 1 {
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panic("missing -l")
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}
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err = newComic(options.Title, options.ImagePath, "", "")
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if err != nil {
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log.Fatal(err)
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}
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log.Println(fmt.Sprintf("comic \"%s\" created", options.Title))
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return
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}
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// views
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http.HandleFunc("/", comicView)
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http.HandleFunc("/latest", latestView)
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http.HandleFunc("/first", firstView)
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http.HandleFunc("/random", randomView)
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http.HandleFunc("/about", firstView)
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http.HandleFunc("/all", allView)
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http.HandleFunc("/blog", firstView)
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// errors
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http.HandleFunc("/404", return404)
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http.HandleFunc("/500", return500)
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// files
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tPath := string(filepath.Join(options.TemplatesPath, "/static/"))
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log.Println(fmt.Sprintf("using templates path \"%s\"", tPath))
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fs := http.FileServer(http.Dir(tPath))
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http.Handle("/static/", http.StripPrefix("/static/", fs))
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log.Println(fmt.Sprintf("using media path \"%s\"", options.MediaPath))
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fs = http.FileServer(http.Dir(options.MediaPath))
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http.Handle("/media/", http.StripPrefix("/media/", fs))
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uri := fmt.Sprintf("%s:%d", options.Address, options.Port)
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log.Println("listening to http://" + uri)
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log.Fatal(http.ListenAndServe(uri, logRequest(http.DefaultServeMux)))
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}
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