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redirect_upload.go
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/
redirect_upload.go
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package main
import (
"fmt"
"net/http"
"net/url"
"os"
"strconv"
)
// redirectRegister handles requests to create a new redirect.
func redirectRegister(w http.ResponseWriter, r *http.Request) {
// Checks if it's a valid request or has reached request limit.
if r.Method != "POST" {
writeError(w, http.StatusBadRequest)
return
}
if hasHitRequestLimit(r.RemoteAddr) {
writeError(w, http.StatusTooManyRequests)
return
}
err := r.ParseForm()
if err != nil {
writeError(w, http.StatusBadRequest)
return
}
// Check if password is correct if mandated.
if password != "" && (len(r.Form["pass"]) != 1 || r.Form["pass"][0] != password) {
http.Error(w, "Password protected instance", http.StatusBadRequest)
return
}
// Check that there are exactly one URL being sent.
if len(r.Form["url"]) != 1 {
http.Error(w, "Expected exactly one target URL", http.StatusBadRequest)
return
}
targetURL := r.Form["url"][0]
// Check that the URL is not too long.
if len(targetURL) > 8000 || hasHitSizeLimit(r.RemoteAddr, int64(len(targetURL))) {
http.Error(w, "URL too long.", http.StatusTooManyRequests)
return
}
// Make sure it's valid URL.
parsedURL, err := url.Parse(targetURL)
if err != nil || (parsedURL.Scheme != "http" && parsedURL.Scheme != "https") {
http.Error(w, "Invalid URL provided.", http.StatusBadRequest)
return
}
// Create the file to write to.
resultID := strconv.FormatInt(getNextFileNum(), 36)
file, err := os.Create("./hosted/" + resultID + ".redir")
if err != nil {
fmt.Println(err)
writeError(w, http.StatusInternalServerError)
return
}
defer file.Close()
// Save the URL into the file.
_, err = file.Write([]byte(targetURL))
if err != nil {
fmt.Println(err)
writeError(w, http.StatusInternalServerError)
return
}
w.Write([]byte(domain + "/r/" + resultID))
}