Add scan function for downloading every form variation

.gitignore

@@ -1,3 +1,4 @@
 .env
 properties.html
 park
+forms/*

README.md

@@ -6,14 +6,6 @@ A Discord bot for easily registering parking at the Register2Park parking system
 - Register against the location using the make, model, and plate.
 - Another command can register your email and acquire an email confirmation.
 
-### Syntax
-
-```
-/register <make> <model> <plate>
-/location <location>
-/email <email>
-```
-
 ## Feature Ideas
 
 - Register commands in new guilds automatically

scan.go

@@ -0,0 +1,65 @@
+package main
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"io"
+	"log"
+	"os"
+	"path/filepath"
+)
+
+func Scan() {
+	locations := GetLocations()
+	total := len(locations)
+
+	for i, location := range locations {
+		log.Printf("[%6.2f] Fetching \"%s\" ", float64(i+1)/float64(total)*100, location.name)
+
+		body := fmt.Sprintf("propertyIdSelected=%d&propertySource=parking-snap", location.id)
+		req := BuildRequestWithBody("POST", "/register-get-vehicle-form", nil, bytes.NewBufferString(body))
+		SetTypicalHeaders(req, nil, nil, false)
+		onRequest(req)
+
+		res, _ := client.Do(req)
+		onResponse(res)
+		html, _ := io.ReadAll(res.Body)
+
+		html_path := filepath.Join("./forms", fmt.Sprintf("%d.html", location.id))
+
+		// Check that file exists and has more than 16 bytes
+		stats, err := os.Stat(html_path)
+		if err != nil && errors.Is(err, os.ErrNotExist) {
+			// File does not exist, create it
+			file, err := os.Create(html_path)
+			if err != nil {
+				panic(err)
+			}
+			defer file.Close()
+
+			_, err = file.Write(html)
+			if err != nil {
+				panic(err)
+			}
+
+			log.Println("DONE")
+		} else if stats.Size() < 16 {
+			// File exists, but is empty
+			file, err := os.OpenFile(html_path, os.O_WRONLY, 0644)
+			if err != nil {
+				panic(err)
+			}
+			defer file.Close()
+
+			_, err = file.Write(html)
+			if err != nil {
+				panic(err)
+			}
+			log.Println("OVERWRITE")
+		} else {
+			// File exists and is not empty, do nothing
+			log.Println("SKIP")
+		}
+	}
+}