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main.go
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main.go
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package main
import (
"encoding/json"
"github.com/gorilla/mux"
"gorm.io/driver/mysql"
"gorm.io/gorm"
"io"
"log"
"net/http"
"net/url"
"os"
"strings"
)
type Handler struct {
db *gorm.DB
}
type Target struct {
Slug string `json:"slug"`
TargetURL string `json:"target_url"`
}
func main() {
// Connect to PlanetScale database using DSN environment variable.
db, err := gorm.Open(mysql.Open(os.Getenv("DSN")), &gorm.Config{
DisableForeignKeyConstraintWhenMigrating: true,
})
if err != nil {
log.Fatalf("failed to connect to PlanetScale: %v", err)
}
handler := NewHandler(db)
// Start an HTTP API server.
const addr = ":8080"
log.Printf("successfully connected to PlanetScale, starting HTTP server on %q", addr)
if err := http.ListenAndServe(addr, handler); err != nil {
log.Fatalf("failed to serve HTTP: %v", err)
}
}
func NewHandler(db *gorm.DB) http.Handler {
h := &Handler{db: db}
r := mux.NewRouter()
r.HandleFunc("/", handleIndex).Methods(http.MethodGet)
r.HandleFunc("/api", handleIndex).Methods(http.MethodGet)
r.HandleFunc("/api/seed", h.seedDatabase).Methods(http.MethodGet)
r.HandleFunc("/api/get/{slug}", h.getTarget).Methods(http.MethodGet)
r.HandleFunc("/api/create", h.putTarget).Methods(http.MethodPost)
r.HandleFunc("/{slug}", h.redirectToTarget).Methods(http.MethodGet)
return r
}
func handleIndex(w http.ResponseWriter, r *http.Request) {
io.WriteString(w, `to get started send a post request to https://u.gosh.ga/api/create/ with json body like this -- {"slug":"my_unique_slug", "target_url":"https://foo-bar.com/"}`)
}
func (h *Handler) seedDatabase(w http.ResponseWriter, r *http.Request) {
if err := h.db.AutoMigrate(&Target{}); err != nil {
http.Error(w, "failed to migrate ghub table", http.StatusInternalServerError)
return
}
io.WriteString(w, "Migrations and Seeding of database complete\n")
}
func (h *Handler) redirectToTarget(w http.ResponseWriter, r *http.Request) {
var target Target
result := h.db.First(&target, h.db.Where("slug = ?", mux.Vars(r)["slug"]))
if result.Error != nil {
http.NotFound(w, r)
return
}
http.Redirect(w, r, target.TargetURL, http.StatusMovedPermanently)
}
func (h *Handler) checkForSlug(slug string) bool {
if err := h.db.Where("slug = ?", slug).First(&Target{}).Error; err != nil {
return false
}
return true
}
func validateSlug(slug string) bool {
return strings.TrimSpace(slug) != "" && strings.TrimSpace(slug) != "api"
}
func validateURL(targetURL string) bool {
_, err := url.ParseRequestURI(targetURL)
return err == nil
}
func (h *Handler) getTarget(w http.ResponseWriter, r *http.Request) {
var target Target
result := h.db.First(&target, h.db.Where("slug = ?", mux.Vars(r)["slug"]))
if result.Error != nil {
http.NotFound(w, r)
return
}
json.NewEncoder(w).Encode(target)
}
func (h *Handler) putTarget(w http.ResponseWriter, r *http.Request) {
var target Target
if err := json.NewDecoder(r.Body).Decode(&target); err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
if h.checkForSlug(target.Slug) || !validateSlug(target.Slug) {
if !validateURL(target.TargetURL) {
http.Error(w, "Target must be a valid URL!", http.StatusBadRequest)
return
}
http.Error(w, "Slug already exists, please try another one!", http.StatusBadRequest)
return
} else {
if err := h.db.Create(&target).Error; err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
}
json.NewEncoder(w).Encode(target)
}