/
main.go
104 lines (78 loc) · 2.12 KB
/
main.go
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package main
import (
"fmt"
"log"
"net/http"
"database/sql"
"github.com/asaskevich/govalidator"
"github.com/gorilla/mux"
generators "github.com/0x471/url-shortener/generators"
dbOp "github.com/0x471/url-shortener/db"
)
const (
CONN_HOST = "localhost"
CONN_PORT = "8080"
)
type dbHandler struct {
Conn *sql.DB
}
func shortenHandler(db *dbHandler) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
urlArr, ok := r.URL.Query()["url"]
if !ok || len(urlArr[0]) < 1 {
w.WriteHeader(400)
fmt.Fprintln(w, "URL parameter is missing")
return
}
url := urlArr[0]
isValidUrl := govalidator.IsURL(url)
if isValidUrl != true {
w.WriteHeader(500)
fmt.Fprintln(w, "Url format is not OK")
return
}
id := generators.GenerateUniqueID(url)
log.Printf("[INFO] URL: %s Adler-32 Checksum: %s", url, id)
if dbOp.SearchObj(db.Conn, id) == "nil" {
dbOp.InsertUrl(db.Conn, url, id)
fmt.Fprintf(w, "/s/%s", id)
return
}
fmt.Fprintf(w, "/s/%s", id)
}
}
func searchHandler(db *dbHandler) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
vars := mux.Vars(r)
id := vars["adler32"]
searchResult := dbOp.SearchObj(db.Conn, id)
if searchResult == "err" {
fmt.Fprintf(w, "url not found.")
return
}
url := searchResult
http.Redirect(w, r, url, 302)
}
}
func main() {
log.Println("[INFO] Checking database...")
database, err := sql.Open("sqlite3", "url-shortener.db")
log.Println("[INFO] Opening database...")
if err != nil {
log.Println("[ERROR] An error occured while opening database:",err)
}
defer database.Close()
dbOp.CheckTable(database)
db := &dbHandler{Conn: database}
log.Println("[INFO] Starting HTTP server...")
router := mux.NewRouter()
router.Handle("/", http.FileServer(http.Dir("./static")))
router.Handle("/s", http.RedirectHandler("/", 302))
router.Handle("/s/{adler32}", searchHandler(db))
router.Handle("/shorten", shortenHandler(db))
err = http.ListenAndServe(CONN_HOST+":"+CONN_PORT, router)
if err != nil {
log.Fatalf("[ERROR] An error occured while starting HTTP server: %s", err)
return
}
}