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|
package links
import (
"crypto/md5"
"fmt"
"github.com/catinello/base62"
"go-gentoo/pkg/app/handler/auth"
"go-gentoo/pkg/config"
"go-gentoo/pkg/database"
"go-gentoo/pkg/models"
"html/template"
"net/http"
"net/url"
"strings"
)
const (
MAX_TRY = 10
MAX_TOKEN_LENGTH = 75
)
func getPageData(w http.ResponseWriter, r *http.Request, tab string) interface{} {
user := auth.GetUser(w, r)
return struct {
Tab string
User *models.User
UserLinks []models.Link
}{
Tab: tab,
User: user,
UserLinks: getLinks(user),
}
}
func getCreatePageData(w http.ResponseWriter, r *http.Request, shortlink, target string) interface{} {
return struct {
Tab string
User *models.User
ShortLink string
Target string
}{
Tab: "new",
User: auth.GetUser(w, r),
ShortLink: config.ApplicationURL() + shortlink,
Target: target,
}
}
func getFuncMap() template.FuncMap {
return template.FuncMap{
"gravatar": emailToGravater,
"replaceAll": strings.ReplaceAll,
}
}
func emailToGravater(email string) string {
return "https://www.gravatar.com/avatar/" + fmt.Sprintf("%x", md5.Sum([]byte(email)))
}
func getLinks(user *models.User) []models.Link {
var links []models.Link
database.DBCon.Model(&links).
Where("user_email = '" + user.Email + "'").
WhereOr(createQuery(user)).
Select()
return links
}
func createQuery(user *models.User) string {
var queryParts []string
for _, project := range user.Projects {
queryParts = append(queryParts, "prefix = '"+project+"'")
}
return strings.Join(queryParts, " OR ")
}
func isValidPrefix(user *models.User, prefix string) bool {
return prefixIsNotReserved(prefix) && (contains(user.Projects, prefix) || prefix == "" || prefix == user.UserName)
}
func prefixIsNotReserved(prefix string) bool {
return prefix != "auth" && prefix != "assets" && prefix != "links" && prefix != "admin"
}
func isValidToken(token string) bool {
for _, char := range token {
if !strings.Contains(config.ValidURLTokenChars(), strings.ToLower(string(char))) {
return false
}
}
return len(token) < MAX_TOKEN_LENGTH
}
func isValidTarget(target string) bool {
_, err := url.ParseRequestURI(target)
return err == nil
}
func getLatestId() int {
var links []models.Link
database.DBCon.Model(&links).
Order("id DESC").
Limit(1).
Select()
if len(links) != 1 {
return 4000
}
return links[0].Id
}
func createShortURL(prefix, token, target, username string, setIndex bool, try int) (string, bool) {
var shortlink string
id := getLatestId() + 1
if token == "" && (!setIndex || prefix == "") {
token = base62.Encode(id)
}
if prefix != "" {
shortlink = "/" + prefix + "/" + token
} else {
shortlink = "/" + token
}
if len(getLink(shortlink)) > 0 && try <= MAX_TRY {
return createShortURL(prefix, token, target, username, setIndex, try+1)
}
err := database.DBCon.Insert(&models.Link{
Id: id,
Prefix: prefix,
URLToken: token,
ShortLink: shortlink,
TargetLink: target,
UserEmail: username,
Hits: 0,
})
return shortlink, err == nil
}
func getLink(shortlink string) []models.Link {
var links []models.Link
database.DBCon.Model(&links).
Where("short_link = ?", shortlink).
Select()
return links
}
func contains(list []string, value string) bool {
for _, v := range list {
if v == value {
return true
}
}
return false
}
|
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