add rudimentary messy function for submitting aplus code

It is very messy, but later using golang's HTML parser should help make it more
readable.

aplus.go

@@ -10,7 +10,7 @@ import (
 	"strings"
 )
 
-func launch_aplus(course_code int) {
+func launch_aplus(course_code int, attendance_code string) {
 	aplus_link := fmt.Sprintf("%s/courses/%d/external_tools/sessionless_launch?id=%d&access_token=%s",
 		base_link, course_code, external_tools_code, token)
 	aplus := get_aplus(token, aplus_link, client)
@@ -24,7 +24,9 @@ func launch_aplus(course_code int) {
 	resp, _ = client.PostForm("https://floridapoly.aplusattendance.com/canvas", form_values)
 	body, _ = io.ReadAll(resp.Body)
 
-	fmt.Println(string(body))
+	submit_code(string(body), attendance_code, "https://floridapoly.aplusattendance.com/canvas/student/")
+
+	// fmt.Println(string(body))
 }
 
 func get_aplus(token string, link string, client http.Client) string {
@@ -38,6 +40,58 @@ func get_aplus(token string, link string, client http.Client) string {
 	return aplus.URL
 }
 
+func submit_code(cur_body string, attendance_code string, current_url string) {
+	// the links to submit the code for a class is under the dayPanel div
+	daypanel_start := strings.Index(cur_body, "<div class=\"dayPanel\"")
+
+	// link_start - link_end is to extract the URL
+	// TODO: make this more elegant to allow multiple of these links
+	//       (maybe use an html parser)
+	// 	 or at least use extract_attribute()
+	link_start := daypanel_start
+	link_start += strings.Index(cur_body[link_start:], "<a href=\"./?module")
+	link_start += len("<a href=\"")
+	link_end := link_start
+	link_end += strings.Index(cur_body[link_end:], "\"")
+
+	link_url := current_url + cur_body[link_start:link_end]
+	link_url = html.UnescapeString(link_url)
+
+	fmt.Println("!!!")
+	fmt.Printf("%i %i %i\n", daypanel_start, link_start, link_end)
+	fmt.Println(link_url)
+	fmt.Println("!!!")
+
+	resp, _ := client.Get(link_url)
+	body, _ := io.ReadAll(resp.Body)
+
+	fmt.Println(string(body))
+
+	form_str := get_form_from_request_body(body)
+	form_values := parse_form(form_str)
+	form_values["ctl01$sessionCode"][0] = attendance_code
+
+	//fmt.Println(form_str)
+	//fmt.Println(form_values)
+
+	resp, _ = client.PostForm(link_url, form_values)
+	body, _ = io.ReadAll(resp.Body)
+
+	fmt.Println(string(body))
+	fmt.Println(resp)
+
+	if strings.Index(string(body), "ctl01_errorMessage") != -1 {
+		errormsg_start := strings.Index(string(body), "ctl01_errorMessage")
+		errormsg_start += strings.Index(string(body)[errormsg_start:], "Text\">")
+		errormsg_start += len("Text\">")
+		errormsg_end := errormsg_start
+		errormsg_end += strings.Index(string(body)[errormsg_start:], "<")
+		fmt.Println(string(body)[errormsg_start:errormsg_end])
+	} else if strings.Index(string(body), "ctl02_codeSuccessMessage") != -1 {
+		fmt.Println("Code successfully recorded")
+	}
+}
+
 func get_form_from_request_body(req_body []byte) string {
 	body_str := string(req_body)
 	form_start := strings.Index(body_str, "<form")

main.go

@@ -14,7 +14,7 @@ func main() {
 
 	// select_course()
 	course_code := 7329
-	launch_aplus(course_code)
+	launch_aplus(course_code, "A1B2C")
 
 	// enter_code()
 }