From c411ee3447fca4389bff3d228a5a0068204f0dad Mon Sep 17 00:00:00 2001
From: Juan Roig <jaroig@outlook.com>
Date: Tue, 31 Oct 2023 02:06:01 -0400
Subject: [PATCH] Form parsing done correctly

---
 go.sum  |  0
 main.go | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++--
 2 files changed, 52 insertions(+), 2 deletions(-)
 create mode 100644 go.sum

diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..e69de29
diff --git a/main.go b/main.go
index eb88b8d..63b978f 100644
--- a/main.go
+++ b/main.go
@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"io"
 	"net/http"
+	"net/url"
 	"strings"
 )
 
@@ -49,6 +50,48 @@ func get_course_ids(canvas_courses []CanvasCourse) []uint64 {
 	return courses
 }
 
+// parseForm extracts form fields and values from the given HTML form string.
+func parse_form(form_html string) url.Values {
+	form_values := make(url.Values)
+	inputs := strings.Split(form_html, "<input")
+
+	for _, input := range inputs {
+		// Extract field name and value
+		name := extract_attribute(input, "name")
+		value := extract_attribute(input, "value")
+
+		if name != "" {
+			form_values.Add(name, value)
+		}
+	}
+
+	return form_values
+}
+
+func extract_attribute(input string, attribute string) string {
+	start := strings.Index(input, attribute+"=\"")
+	if start == -1 {
+		start = strings.Index(input, attribute+"='")
+	}
+
+	if start == -1 {
+		return ""
+	}
+
+	start += len(attribute) + 2
+
+	end := strings.Index(input[start:], "\"")
+	if end == -1 {
+		end = strings.Index(input[start:], "'")
+	}
+
+	if end == -1 {
+		return ""
+	}
+
+	return input[start : start+end]
+}
+
 func main() {
 	client := http.Client{
 		CheckRedirect: func(req *http.Request, via []*http.Request) error {
@@ -59,7 +102,7 @@ func main() {
 
 	// https://canvas.instructure.com/api/v1/courses?access_token={}&per_page=100", canvas_token
 	base_link := "https://floridapolytechnic.instructure.com/api/v1"
-	token := "token here"
+	token := "token"
 
 	// course selection by user happens below
 	//favorites := fmt.Sprintf("%s/users/self/favorites/courses?access_token=%s&per_page=100", base_link, token)
@@ -100,8 +143,15 @@ func main() {
 	form_end := strings.Index(body_str, "</form>") + 7
 	form_html := body[form_start:form_end]
 
-	fmt.Println(string(form_html))
+	form := string(form_html)
+	fmt.Println(form)
 
+	form_values := parse_form(form)
+
+	fmt.Println("Form Values:")
+	for key, values := range form_values {
+		fmt.Printf("%s: %s\n", key, values)
+	}
 }
 
 /*