419 lines
11 KiB
Go
419 lines
11 KiB
Go
package main
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import (
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"context"
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"database/sql"
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"fmt"
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"log"
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"math/rand"
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"net/http"
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"os"
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"path/filepath"
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"strconv"
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"sync"
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"time"
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goshutdowner "git.jlel.se/jlelse/go-shutdowner"
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"github.com/go-chi/chi/v5"
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"github.com/go-chi/chi/v5/middleware"
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_ "github.com/mattn/go-sqlite3"
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"github.com/spf13/viper"
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)
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var (
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appDb *sql.DB
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appRouter *chi.Mux
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dbWriteLock sync.Mutex
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shutdown goshutdowner.Shutdowner
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)
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func initRouter() {
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appRouter = chi.NewRouter()
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appRouter.Use(middleware.GetHead)
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appRouter.Group(func(r chi.Router) {
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r.Use(loginMiddleware)
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r.Get("/s", shortenFormHandler)
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r.Post("/s", shortenHandler)
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r.Get("/t", shortenTextFormHandler)
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r.Post("/t", shortenTextHandler)
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r.Get("/u", updateFormHandler)
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r.Get("/ut", updateTextFormHandler)
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r.Post("/u", updateHandler)
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r.Get("/d", deleteFormHandler)
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r.Post("/d", deleteHandler)
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r.Get("/l", listHandler)
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})
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appRouter.Get("/{slug}", shortenedURLHandler)
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appRouter.Get("/", defaultURLRedirectHandler)
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}
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func main() {
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rand.Seed(time.Now().UTC().UnixNano())
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viper.SetDefault("dbPath", "data/goshort.db")
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viper.SetDefault("port", 8080)
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viper.SetConfigName("config")
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viper.AddConfigPath("./config")
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viper.AddConfigPath(".")
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_ = viper.ReadInConfig()
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if !viper.IsSet("dbPath") {
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log.Fatal("No database path (dbPath) is configured.")
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}
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if !viper.IsSet("password") {
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log.Fatal("No password (password) is configured.")
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}
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if !viper.IsSet("shortUrl") {
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log.Fatal("No short URL (shortUrl) is configured.")
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}
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if !viper.IsSet("defaultUrl") {
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log.Fatal("No default URL (defaultUrl) is configured.")
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}
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var err error
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dbPath := viper.GetString("dbPath")
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_ = os.MkdirAll(filepath.Dir(dbPath), 0644)
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appDb, err = sql.Open("sqlite3", dbPath+"?cache=shared&mode=rwc&_journal_mode=WAL&_busy_timeout=100")
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if err != nil {
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log.Println("Error opening database:", err.Error())
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}
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shutdown.Add(func() {
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_ = appDb.Close()
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log.Println("Closed database")
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})
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migrateDatabase()
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defer func() {
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_ = appDb.Close()
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}()
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initRouter()
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httpServer := &http.Server{
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Addr: ":" + strconv.Itoa(viper.GetInt("port")),
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Handler: appRouter,
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ReadTimeout: 5 * time.Minute,
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WriteTimeout: 5 * time.Minute,
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}
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shutdown.Add(func() {
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toc, c := context.WithTimeout(context.Background(), 5*time.Second)
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defer c()
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if err := httpServer.Shutdown(toc); err != nil {
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log.Println("Error on server shutdown:", err.Error())
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}
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log.Println("Stopped server")
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})
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go func() {
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fmt.Println("Listening to " + httpServer.Addr)
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if err := httpServer.ListenAndServe(); err != nil && err != http.ErrServerClosed {
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log.Println("Failed to start HTTP server:", err.Error())
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}
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}()
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shutdown.Wait()
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}
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func loginMiddleware(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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if !checkPassword(w, r) {
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return
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}
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next.ServeHTTP(w, r)
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})
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}
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func shortenFormHandler(w http.ResponseWriter, r *http.Request) {
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if err := generateURLForm(w, "Shorten URL", "s", [][]string{{"url", r.FormValue("url")}, {"slug", r.FormValue("slug")}}); err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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}
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}
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func updateFormHandler(w http.ResponseWriter, r *http.Request) {
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if err := generateURLForm(w, "Update short link", "u", [][]string{{"slug", r.FormValue("slug")}, {"type", "url"}, {"new", r.FormValue("new")}}); err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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}
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}
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func updateTextFormHandler(w http.ResponseWriter, r *http.Request) {
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if err := generateTextForm(w, "Update text", "u", [][]string{{"slug", r.FormValue("slug")}, {"type", "text"}}, [][]string{{"new", r.FormValue("new")}}); err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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}
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}
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func deleteFormHandler(w http.ResponseWriter, r *http.Request) {
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if err := generateURLForm(w, "Delete short link", "d", [][]string{{"slug", r.FormValue("slug")}}); err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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}
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}
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func shortenTextFormHandler(w http.ResponseWriter, r *http.Request) {
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if err := generateTextForm(w, "Save text", "t", [][]string{{"slug", r.FormValue("slug")}}, [][]string{{"text", r.FormValue("text")}}); err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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}
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}
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func generateURLForm(w http.ResponseWriter, title string, url string, fields [][]string) error {
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return urlFormTemplate.Execute(w, map[string]interface{}{
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"Title": title,
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"URL": url,
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"Fields": fields,
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})
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}
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func generateTextForm(w http.ResponseWriter, title string, url string, fields [][]string, textAreas [][]string) error {
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return textFormTemplate.Execute(w, map[string]interface{}{
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"Title": title,
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"URL": url,
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"Fields": fields,
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"TextAreas": textAreas,
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})
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}
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func shortenHandler(w http.ResponseWriter, r *http.Request) {
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writeShortenedURL := func(w http.ResponseWriter, slug string) {
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_, _ = w.Write([]byte(viper.GetString("shortUrl") + "/" + slug))
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}
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requestURL := r.FormValue("url")
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if requestURL == "" {
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http.Error(w, "url parameter not set", http.StatusBadRequest)
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return
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}
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slug := r.FormValue("slug")
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manualSlug := false
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if slug == "" {
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_ = appDb.QueryRow("SELECT slug FROM redirect WHERE url = ?", requestURL).Scan(&slug)
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} else {
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manualSlug = true
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}
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if slug != "" {
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if e, _ := slugExists(slug); e {
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if manualSlug {
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http.Error(w, "slug already in use", http.StatusBadRequest)
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return
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}
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writeShortenedURL(w, slug)
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return
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}
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} else {
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exists := true
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var err error
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for exists {
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slug = generateSlug()
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exists, err = slugExists(slug)
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if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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}
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}
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dbWriteLock.Lock()
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if _, err := appDb.Exec("INSERT INTO redirect (slug, url) VALUES (?, ?)", slug, requestURL); err != nil {
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dbWriteLock.Unlock()
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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dbWriteLock.Unlock()
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w.WriteHeader(http.StatusCreated)
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writeShortenedURL(w, slug)
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}
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func shortenTextHandler(w http.ResponseWriter, r *http.Request) {
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writeShortenedURL := func(w http.ResponseWriter, slug string) {
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_, _ = w.Write([]byte(viper.GetString("shortUrl") + "/" + slug))
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}
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requestText := r.FormValue("text")
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if requestText == "" {
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http.Error(w, "text parameter not set", http.StatusBadRequest)
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return
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}
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slug := r.FormValue("slug")
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manualSlug := false
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if slug == "" {
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_ = appDb.QueryRow("SELECT slug FROM redirect WHERE url = ? and type = 'text'", requestText).Scan(&slug)
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} else {
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manualSlug = true
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}
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if slug != "" {
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if e, _ := slugExists(slug); e {
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if manualSlug {
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http.Error(w, "slug already in use", http.StatusBadRequest)
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return
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}
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writeShortenedURL(w, slug)
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return
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}
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} else {
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exists := true
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var err error
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for exists {
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slug = generateSlug()
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exists, err = slugExists(slug)
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if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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}
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}
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dbWriteLock.Lock()
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if _, err := appDb.Exec("INSERT INTO redirect (slug, url, type) VALUES (?, ?, 'text')", slug, requestText); err != nil {
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dbWriteLock.Unlock()
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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dbWriteLock.Unlock()
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w.WriteHeader(http.StatusCreated)
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writeShortenedURL(w, slug)
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}
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func updateHandler(w http.ResponseWriter, r *http.Request) {
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slug := r.FormValue("slug")
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if slug == "" {
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http.Error(w, "Specify the slug to update", http.StatusBadRequest)
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return
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}
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newURL := r.FormValue("new")
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if newURL == "" {
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http.Error(w, "Specify the new URL", http.StatusBadRequest)
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return
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}
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typeString := r.FormValue("type")
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if typeString == "" {
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typeString = "url"
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}
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if e, err := slugExists(slug); err != nil || !e {
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http.NotFound(w, r)
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return
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}
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dbWriteLock.Lock()
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if _, err := appDb.Exec("UPDATE redirect SET url = ?, type = ? WHERE slug = ?", newURL, typeString, slug); err != nil {
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dbWriteLock.Unlock()
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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dbWriteLock.Unlock()
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w.WriteHeader(http.StatusAccepted)
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_, _ = w.Write([]byte("Slug updated"))
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}
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func deleteHandler(w http.ResponseWriter, r *http.Request) {
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slug := r.FormValue("slug")
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if slug == "" {
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http.Error(w, "Specify the slug to delete", http.StatusBadRequest)
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return
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}
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if e, err := slugExists(slug); !e || err != nil {
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http.NotFound(w, r)
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return
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}
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dbWriteLock.Lock()
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if _, err := appDb.Exec("DELETE FROM redirect WHERE slug = ?", slug); err != nil {
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dbWriteLock.Unlock()
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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dbWriteLock.Unlock()
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w.WriteHeader(http.StatusAccepted)
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_, _ = w.Write([]byte("Slug deleted"))
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}
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func listHandler(w http.ResponseWriter, r *http.Request) {
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type row struct {
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Slug string
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URL string
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Hits int
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}
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var list []row
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rows, err := appDb.Query("SELECT slug, url, hits FROM redirect")
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if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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for rows.Next() {
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var r row
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err = rows.Scan(&r.Slug, &r.URL, &r.Hits)
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if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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list = append(list, r)
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}
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err = listTemplate.Execute(w, &list)
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if err != nil {
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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}
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func checkPassword(w http.ResponseWriter, r *http.Request) bool {
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if r.FormValue("password") == viper.GetString("password") {
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return true
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}
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if _, pass, ok := r.BasicAuth(); !ok || pass != viper.GetString("password") {
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w.Header().Set("WWW-Authenticate", `Basic realm="Please enter a password!"`)
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http.Error(w, "Not authenticated", http.StatusUnauthorized)
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return false
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}
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return true
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}
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func generateSlug() string {
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var chars = []rune("0123456789abcdefghijklmnopqrstuvwxyz")
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s := make([]rune, 6)
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for i := range s {
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s[i] = chars[rand.Intn(len(chars))]
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}
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return string(s)
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}
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func slugExists(slug string) (exists bool, err error) {
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err = appDb.QueryRow("SELECT EXISTS(SELECT 1 FROM redirect WHERE slug = ?)", slug).Scan(&exists)
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return
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}
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func shortenedURLHandler(w http.ResponseWriter, r *http.Request) {
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slug := chi.URLParam(r, "slug")
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var redirectURL, typeString string
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err := appDb.QueryRow("SELECT url, type FROM redirect WHERE slug = ?", slug).Scan(&redirectURL, &typeString)
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if err != nil {
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http.NotFound(w, r)
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return
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}
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go func() {
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dbWriteLock.Lock()
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_, _ = appDb.Exec("UPDATE redirect SET hits = hits + 1 WHERE slug = ?", slug)
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dbWriteLock.Unlock()
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}()
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if typeString == "text" {
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_, _ = w.Write([]byte(redirectURL))
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} else {
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http.Redirect(w, r, redirectURL, http.StatusTemporaryRedirect)
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}
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}
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func defaultURLRedirectHandler(w http.ResponseWriter, r *http.Request) {
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http.Redirect(w, r, viper.GetString("defaultUrl"), http.StatusTemporaryRedirect)
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}
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