From 4af67b036396ca952b85b93b4d4bc371cd7bfcd9 Mon Sep 17 00:00:00 2001
From: Juan Roig <jaroig@outlook.com>
Date: Sat, 4 Nov 2023 01:55:30 -0400
Subject: [PATCH] Moved functional code to funcs.go

---
 funcs.go | 128 +++++++++++++++++++++++++++++++
 main.go  | 224 +++++++------------------------------------------------
 2 files changed, 153 insertions(+), 199 deletions(-)
 create mode 100644 funcs.go

diff --git a/funcs.go b/funcs.go
new file mode 100644
index 0000000..5e334ff
--- /dev/null
+++ b/funcs.go
@@ -0,0 +1,128 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"strings"
+)
+
+/*
+func get_courses(token string, link string, client http.Client) []CanvasCourse {
+	resp, err := client.Get(link)
+	if err != nil {
+		fmt.Println("Error performing GET request to get courses.")
+	}
+	defer resp.Body.Close()
+	body, err := io.ReadAll(resp.Body)
+
+	if err != nil {
+		fmt.Println("Error trying to read html body for courses.")
+	}
+
+	var canvas_courses []CanvasCourse
+	err2 := json.Unmarshal(body, &canvas_courses)
+	if err2 != nil {
+		fmt.Println(err2)
+		return nil
+	}
+
+	return canvas_courses
+}
+
+// Need to change this to grab both ID and name, return as pairs.
+func get_course_id_name_pair(canvas_courses []CanvasCourse) []uint64 {
+	var courses []uint64
+
+	for _, course := range canvas_courses {
+		courses = append(courses, course.ID%10000)
+	}
+	return courses
+}
+
+func select_course() int {
+	// course selection by user happens below
+	//favorites := fmt.Sprintf("%s/users/self/favorites/courses?access_token=%s&per_page=100", base_link, token)
+	//all_courses := fmt.Sprintf("%s/courses?access_token=%s&per_page=100", base_link,token)
+	// var canvas_courses []CanvasCourse
+	//canvas_courses = get_courses(token, favorites, client)
+	//var course_ids []uint64
+	//course_ids = get_course_ids(canvas_courses)
+	//selected := 1 // course_ids[selected]
+	// course selection by user happens above
+	return 0
+}
+*/
+
+func get_aplus(token string, link string, client http.Client) string {
+	resp, err := client.Get(link)
+
+	if err != nil {
+		fmt.Println("Error performing GET request to initial link.")
+	}
+	defer resp.Body.Close()
+	body, err := io.ReadAll(resp.Body)
+
+	if err != nil {
+		fmt.Println("Error reading body of initial aplus html response " +
+			"which is supposed to contain a one-time link for getting the form.")
+	}
+
+	var aplus Aplus
+	json.Unmarshal(body, &aplus)
+
+	return aplus.URL
+}
+
+func get_form_from_request_body(req_body []byte) string {
+	body_str := string(req_body)
+	form_start := strings.Index(body_str, "<form")
+	form_end := strings.Index(body_str, "</form>") + 7
+	form_html := req_body[form_start:form_end]
+
+	return string(form_html)
+}
+
+// parse_form 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]
+}
diff --git a/main.go b/main.go
index 6a51539..27dc3fd 100644
--- a/main.go
+++ b/main.go
@@ -1,97 +1,12 @@
 package main
 
 import (
-	"encoding/json"
 	"fmt"
 	"io"
 	"net/http"
-	"net/url"
-	"strings"
+	"os"
 )
 
-func get_courses(token string, link string, client http.Client) []CanvasCourse {
-	resp, err := client.Get(link)
-	if err != nil {
-		// handle error
-	}
-	defer resp.Body.Close()
-	body, err := io.ReadAll(resp.Body)
-
-	var canvas_courses []CanvasCourse
-	err2 := json.Unmarshal(body, &canvas_courses)
-	if err2 != nil {
-		fmt.Println(err2)
-		return nil
-	}
-
-	return canvas_courses
-}
-
-func get_aplus(token string, link string, client http.Client) string {
-	resp, err := client.Get(link)
-
-	if err != nil {
-		// handle error
-	}
-	defer resp.Body.Close()
-	body, err := io.ReadAll(resp.Body)
-	var aplus Aplus
-	json.Unmarshal(body, &aplus)
-
-	return aplus.URL
-}
-
-func get_course_ids(canvas_courses []CanvasCourse) []uint64 {
-	var courses []uint64
-
-	for _, course := range canvas_courses {
-		courses = append(courses, course.ID%10000)
-	}
-	return courses
-}
-
-// parse_form 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 {
@@ -100,145 +15,56 @@ 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"
+	token := os.Getenv("CANVAS_API_KEY")
 
-	// course selection by user happens below
-	//favorites := fmt.Sprintf("%s/users/self/favorites/courses?access_token=%s&per_page=100", base_link, token)
-	//all_courses := fmt.Sprintf("%s/courses?access_token=%s&per_page=100", base_link,token)
-	//var canvas_courses []CanvasCourse
-	//canvas_courses = get_courses(token, favorites, client)
-	//var course_ids []uint64
-	//course_ids = get_course_ids(canvas_courses)
-	//selected := 1 // course_ids[selected]
-	// course selection by user happens above
+	// select_course()
 
 	aplus_link := fmt.Sprintf("%s/courses/%d/external_tools/sessionless_launch?id=913&access_token=%s", base_link, 7329, token) // 7329 always works
-	var aplus string
-	aplus = get_aplus(token, aplus_link, client)
+	aplus := get_aplus(token, aplus_link, client)
 	fmt.Println(aplus)
 	resp, err := client.Get(aplus)
 
 	if err != nil {
-		// handle error
+		fmt.Println("Error while performing GET request to aplus auth link.")
 	}
 
-	//fmt.Println(resp)
-
 	defer resp.Body.Close()
 	body, err := io.ReadAll(resp.Body)
 
-	//fmt.Println(string(body))
-	//fmt.Println(resp)
-	//fmt.Println("Status code:", resp.StatusCode)
-
 	if err != nil {
-		// handle error
+		fmt.Println("Error reading body of initial aplus html response.")
 	}
 
-	body_str := string(body)
+	form_str := get_form_from_request_body(body)
+	fmt.Println(form_str)
 
-	form_start := strings.Index(body_str, "<form")
-	form_end := strings.Index(body_str, "</form>") + 7
-	form_html := body[form_start:form_end]
-
-	form := string(form_html)
-	fmt.Println(form)
-
-	form_values := parse_form(form)
+	form_values := parse_form(form_str)
 
 	fmt.Println("Form Values:")
 	for key, values := range form_values {
 		fmt.Printf("%s: %s\n", key, values)
 	}
 
-	//req, err := http.PostForm("https://floridapoly.aplusattendance.com/canvas", form_values)
 	req, err := client.PostForm("https://floridapoly.aplusattendance.com/canvas", form_values)
+
+	if err != nil {
+		fmt.Println("Error posting form to Aplus Attendance.")
+	}
+
 	body, err = io.ReadAll(req.Body)
 
+	if err != nil {
+		fmt.Println("Error reading body of post form response from aplus attendance.")
+	}
+
 	fmt.Println(string(body))
 	fmt.Println(req)
+
+	// we need to submit the above post request correctly in order to submit this request.
+	//resp, err = client.Get("https://floridapoly.aplusattendance.com/canvas/student/?canvasCourse=7329&doStudentAuth=true")
+	//body, err = io.ReadAll(req.Body)
+
+	//fmt.Println(string(body))
+	//fmt.Println(req)
 }
-
-/*
-
-The code below takes the form that defines the post request we must perform to the aplusattendance.com site, and actually maps it to a request.
-what I have to do is programmatically grab that form, translate it on the fly, and submit the request rather than doing this manually.
-// Define the form data as a map of key-value pairs.
-	formData := map[string]string{
-		"oauth_consumer_key":               "aplus-attendance",
-		"oauth_signature_method":           "HMAC-SHA1",
-		"oauth_timestamp":                 "1698650339",
-		"oauth_nonce":                    "nV9EswFv8LtXXRVgRmWW8NSQ7mO3Sheeqi1SjJWPJGE",
-		"oauth_version":                  "1.0",
-		"context_id":                    "0c1f49ff7b35cba2226f93e9cbb84ae810ed00ab",
-		"context_label":                 "CIS4367.01I&T",
-		"context_title":                 "Computer Security(FA 2023_CIS4367.01 I&T",
-		"custom_canvas_api_domain":      "floridapolytechnic.instructure.com",
-		"custom_canvas_course_id":       "7329",
-		"custom_canvas_enrollment_state": "active",
-		"custom_canvas_user_id":         "6858",
-		"custom_canvas_user_login_id":   "jroig9590",
-		"custom_canvas_workflow_state":  "available",
-		"ext_roles":                     "urn:lti:instrole:ims/lis/Student,urn:lti:role:ims/lis/Learner,urn:lti:sysrole:ims/lis/User",
-		"launch_presentation_document_target": "iframe",
-		"launch_presentation_locale":   "en",
-		"launch_presentation_return_url": "https://floridapolytechnic.instructure.com/courses/7329",
-		"lis_course_offering_sourcedid": "7093",
-		"lis_person_contact_email_primary": "jroig9590@floridapoly.edu",
-		"lis_person_name_family":         "Roig",
-		"lis_person_name_full":           "Juan Roig",
-		"lis_person_name_given":          "Juan",
-		"lis_person_sourcedid":           "10308",
-		"lti_message_type":               "basic-lti-launch-request",
-		"lti_version":                    "LTI-1p0",
-		"oauth_callback":                "about:blank",
-		"resource_link_id":              "0c1f49ff7b35cba2226f93e9cbb84ae810ed00ab",
-		"resource_link_title":           "aPlus+ Attendance",
-		"roles":                         "Learner",
-		"tool_consumer_info_product_family_code": "canvas",
-		"tool_consumer_info_version":           "cloud",
-		"tool_consumer_instance_contact_email": "notifications@instructure.com",
-		"tool_consumer_instance_guid":          "7db438071375c02373713c12c73869ff2f470b68.floridapolytechnic.instructure.com",
-		"tool_consumer_instance_name":          "Florida Polytechnic University",
-		"user_id":                             "91ba5b390440f646d9d4c47a0dc14f91cf595887",
-		"user_image":                           "https://canvas.instructure.com/images/messages/avatar-50.png",
-		"oauth_signature":                      "u3mIfUZ+qgSN4zzk0Ipklc0A7KU=",
-	}
-
-	// Create an HTTP client
-	client := &http.Client{}
-
-	// Create a new request
-	req, err := http.NewRequest("POST", "https://floridapoly.aplusattendance.com/canvas", bytes.NewBuffer([]byte{}))
-	if err != nil {
-		fmt.Println("Error creating the request:", err)
-		return
-	}
-
-	// Add the form data as URL-encoded values to the request
-	q := req.URL.Query()
-	for key, value := range formData {
-		q.Add(key, value)
-	}
-	req.URL.RawQuery = q.Encode()
-
-	// Set the appropriate content type for the form
-	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
-
-	// Perform the POST request
-	resp, err := client.Do(req)
-	if err != nil {
-		fmt.Println("Error sending the POST request:", err)
-		return
-	}
-	defer resp.Body.Close()
-
-	// Check the response
-	if resp.StatusCode == http.StatusOK {
-		fmt.Println("Request successful. You may need to parse and process the response body if applicable.")
-	} else {
-		fmt.Println("Request failed with status code:", resp.Status)
-	}
-*/