[Classroom] Get course list for an user

backend/src/controller/classroom/mod.rs

@@ -1,9 +1,14 @@
+use crate::{
+    json_result::JsonResult,
+    model::classroom_user::ClassroomPersonCreate,
+    online_classroom::{create_user::create, get_courses::ClassroomCourse},
+};
 use rocket::{http::Status, serde::json::Json};
 
-use crate::{json_result::JsonResult, model::classroom_user::ClassroomPersonCreate, online_classroom::create_user::create};
-
 #[options("/classroom/user")]
-pub fn create_user_options() -> Status { Status::Ok }
+pub fn create_user_options() -> Status {
+    Status::Ok
+}
 
 #[post("/classroom/user", format = "json", data = "<data>")]
 pub async fn create_user(data: Json<ClassroomPersonCreate>) -> (Status, Json<JsonResult<()>>) {
@@ -12,3 +17,11 @@ pub async fn create_user(data: Json<ClassroomPersonCreate>) -> (Status, Json<Jso
         Err(err) => return (Status::InternalServerError, JsonResult::err(err)),
     }
 }
+
+#[get("/classroom/course/<user_id>")]
+pub async fn get_courses(user_id: i32) -> (Status, Json<JsonResult<Vec<ClassroomCourse>>>) {
+    match crate::online_classroom::get_courses::get_courses(user_id).await {
+        Ok(courses) => return (Status::Ok, JsonResult::ok(courses)),
+        Err(err) => return (Status::InternalServerError, JsonResult::err(err)),
+    }
+}

backend/src/controller/mod.rs

@@ -1,5 +1,5 @@
+pub mod classroom;
 pub mod course;
 pub mod custom_label;
 pub mod person;
 pub mod register;
-pub mod classroom;

backend/src/controller/person/mod.rs

@@ -129,21 +129,23 @@ pub async fn get_by_dni(dni: i32) -> (Status, Json<JsonResult<Person>>) {
     )
 }
 
-
 #[options("/person/link")]
-pub fn options_p() -> Status { Status::Ok }
+pub fn options_p() -> Status {
+    Status::Ok
+}
 
 #[put("/person/link", format = "json", data = "<data>")]
 pub async fn link_person(data: Json<PersonLink>) -> (Status, Json<JsonResult<()>>) {
     match data.0.insert().await {
         Ok(_) => (Status::Ok, JsonResult::ok(())),
-        Err(reason) => (Status::Ok, JsonResult::err(reason))
+        Err(reason) => (Status::Ok, JsonResult::err(reason)),
     }
 }
 
-
 #[options("/person")]
-pub fn options() -> Status { Status::Ok }
+pub fn options() -> Status {
+    Status::Ok
+}
 
 #[post("/person", format = "json", data = "<person>")]
 pub async fn create_person(person: Json<PersonCreate>) -> Status {

backend/src/main.rs

@@ -61,6 +61,7 @@ async fn rocket() -> _ {
             online_classroom::user::get_users,
             controller::classroom::create_user_options,
             controller::classroom::create_user,
+            controller::classroom::get_courses,
         ],
     )
 }

backend/src/model/classroom_user.rs

@@ -1,4 +1,4 @@
-use serde::{Serialize, Deserialize};
+use serde::{Deserialize, Serialize};
 
 #[derive(Debug, Serialize, Deserialize)]
 pub struct ClassroomPerson {
@@ -8,7 +8,6 @@ pub struct ClassroomPerson {
     pub user_id: String,
 }
 
-
 #[derive(Debug, Deserialize)]
 pub struct ClassroomPersonCreate {
     pub person_email: String,

backend/src/model/mod.rs

@@ -1,6 +1,6 @@
+pub mod classroom_user;
 pub mod course;
 pub mod custom_label;
 pub mod person;
 pub mod register;
 pub mod reniec_person;
-pub mod classroom_user;

backend/src/model/person.rs

@@ -64,7 +64,6 @@ impl PersonCreate {
     }
 }
 
-
 #[derive(Deserialize)]
 pub struct PersonLink {
     pub person_id: i32,

backend/src/online_classroom/create_user.rs

@@ -1,6 +1,6 @@
-use scraper::{Selector, Html};
+use super::session::{create_user_request, request};
 use crate::model::{classroom_user::ClassroomPersonCreate, person::PersonLink};
-use super::session::{request, create_user_request};
+use scraper::{Html, Selector};
 
 const CREATION_ERR: &str = "Creation successful, but linking failed";
 
@@ -28,30 +28,33 @@ pub async fn create(data: &ClassroomPersonCreate) -> Result<(), String> {
 
         match users {
             Ok(user) if user.len() == 1 => {
-                let user_id: i32 = user[0].user_id.parse()
+                let user_id: i32 = user[0].user_id.parse().or_else(|err| {
-                    .or_else(|err| Err(format!("{}: Error parsing user_id: {:?}", CREATION_ERR, err)))?;
+                    Err(format!(
+                        "{}: Error parsing user_id: {:?}",
+                        CREATION_ERR, err
+                    ))
+                })?;
 
                 let result = PersonLink {
                     person_id: data.person_id,
                     person_classroom_id: user_id,
-                }.insert().await;
+                }
+                .insert()
+                .await;
 
                 match result {
                     Ok(_) => return Ok(()),
-                    Err(reason) => {
+                    Err(reason) => return Err(format!("{}: {}", CREATION_ERR, reason)),
-                        return Err(format!("{}: {}", CREATION_ERR, reason))
-                    }
                 }
             }
             Ok(u) if u.is_empty() => {
-                return Err(format!("{}: No users with username {} found", CREATION_ERR, data.person_username))
+                return Err(format!(
-            }
+                    "{}: No users with username {} found",
-            Ok(_) => {
+                    CREATION_ERR, data.person_username
-                return Err(format!("{}: More than 1 user found", CREATION_ERR))
+                ))
-            }
-            Err(reason) => {
-                return Err(format!("{}: {}", CREATION_ERR, reason))
             }
+            Ok(_) => return Err(format!("{}: More than 1 user found", CREATION_ERR)),
+            Err(reason) => return Err(format!("{}: {}", CREATION_ERR, reason)),
         }
     }
 
@@ -73,7 +76,11 @@ async fn get_form_sec_token() -> Result<String, String> {
 
     let sec_token_value = match input_element.value().attr("value") {
         Some(val) => val,
-        None => return Err(format!("Error getting sec_token value from input. Not found")),
+        None => {
+            return Err(format!(
+                "Error getting sec_token value from input. Not found"
+            ))
+        }
     };
 
     Ok(sec_token_value.into())

backend/src/online_classroom/get_courses.rs

@@ -0,0 +1,99 @@
+use super::session::request;
+use scraper::{Html, Selector};
+use serde::Serialize;
+
+#[derive(Debug, Serialize)]
+pub struct ClassroomCourse {
+    name: String,
+}
+
+pub async fn get_courses(user_id: i32) -> Result<Vec<ClassroomCourse>, String> {
+    let html = request(format!(
+        "/main/admin/user_information.php?user_id={}",
+        user_id
+    ))
+    .await?;
+
+    let fragment = Html::parse_document(&html);
+
+    // Courses selector
+    let courses_selector =
+        Selector::parse(".table.table-hover.table-striped.table-bordered.data_table")
+            .or_else(|err| Err(format!("Error creating table selector: {:?}", err)))?;
+    // tr
+    let tr_selector = Selector::parse("tr")
+        .or_else(|err| Err(format!("Error creating tr selector: {:?}", err)))?;
+    // td
+    let td_selector = Selector::parse("td")
+        .or_else(|err| Err(format!("Error creating td selector: {:?}", err)))?;
+
+    let table = match fragment.select(&courses_selector).next() {
+        Some(t) => t,
+        None => {
+            // The courses table was not found.
+            // If we are in the user page, it means that the user has no courses
+            if ensure_is_user_page(&fragment, user_id) {
+                return Ok(Vec::new());
+            } else {
+                // If we are not in the user page, it means that there was an error
+                return Err(format!("Error selecting courses table. Not found"));
+            }
+        }
+    };
+
+    let mut courses: Vec<ClassroomCourse> = Vec::new();
+
+    let mut tr_iter = table.select(&tr_selector);
+    // Consume table header
+    tr_iter.next();
+
+    for table_row in tr_iter {
+        let td_els = table_row.select(&td_selector).collect::<Vec<_>>();
+
+        if td_els.len() != 6 {
+            return Err(format!(
+                "Error parsing tr: td elements count is not 6, but {}",
+                td_els.len()
+            ));
+        }
+
+        let course_name = td_els[1].inner_html();
+        courses.push(ClassroomCourse { name: course_name })
+    }
+
+    Ok(courses)
+}
+
+/// Searches in the document for the user toolbar, and checks if the user id matches
+fn ensure_is_user_page(document: &Html, user_id: i32) -> bool {
+    // toolbar-user-information
+
+    let user_toolbar = Selector::parse("#toolbar-user-information").unwrap();
+
+    let a_selector = Selector::parse("a").unwrap();
+
+    let toolbar_el = match document.select(&user_toolbar).next() {
+        Some(t) => t,
+        None => return false,
+    };
+
+    let a_element = match toolbar_el.select(&a_selector).next() {
+        Some(a) => a,
+        None => return false,
+    };
+
+    // Get href attribute
+    let href_value = a_element.value().attr("href").unwrap_or("");
+
+    // href should be like: https://testing.aulavirtual.eegsac.com/main/mySpace/myStudents.php?student=2142
+    let user_id_start = match href_value.find("student=") {
+        Some(i) => i + 8,
+        None => return false,
+    };
+    let user_id_str = href_value[user_id_start..].to_string();
+
+    match user_id_str.parse::<i32>() {
+        Ok(id) => id == user_id,
+        Err(_) => false,
+    }
+}

backend/src/online_classroom/mod.rs

@@ -4,9 +4,10 @@ use crate::json_result::JsonResult;
 
 use self::session::ensure_session;
 
+pub mod create_user;
+pub mod get_courses;
 mod session;
 pub mod user;
-pub mod create_user;
 
 /// Tries to connect to the online classroom, and get a session cookie
 #[get("/classroom/connect")]

backend/src/online_classroom/session.rs

@@ -44,7 +44,6 @@ pub async fn request(url: String) -> Result<String, String> {
     }
 }
 
-
 /// Handles request for creating a user.
 ///
 /// Returns `Ok("")` if the request was redirected (i.e. the user was created successfully
@@ -77,7 +76,7 @@ pub async fn create_user_request(url: String, body: String) -> Result<String, St
 
     if response.status() == isahc::http::StatusCode::FOUND {
         println!("Redirected!");
-        return Ok("".into())
+        return Ok("".into());
     }
 
     match response.text() {
@@ -86,7 +85,6 @@ pub async fn create_user_request(url: String, body: String) -> Result<String, St
     }
 }
 
-
 /// Makes sure that the session cookie is set, and that it is valid
 pub async fn ensure_session() -> Result<(), String> {
     let last_usage_time = SESSION_TIME.read().unwrap().clone();

backend/src/online_classroom/user.rs

@@ -5,8 +5,6 @@ use rocket::{http::Status, serde::json::Json};
 use scraper::{ElementRef, Html, Selector};
 use urlencoding::encode;
 
-
-
 // Instead of requesting pages and managing session & cookies manually,
 // create a wrapper that:
 // - Checks if the session cookie is valid
@@ -26,7 +24,8 @@ pub async fn get_users_impl(search_param: String) -> Result<Vec<ClassroomPerson>
     let html = request(format!(
         "/main/admin/user_list.php?keyword={}&submit=&_qf__search_simple=",
         encode(search_param.as_str())
-    )).await;
+    ))
+    .await;
 
     match html {
         Ok(html) => match parse_users(&html) {
@@ -36,7 +35,7 @@ pub async fn get_users_impl(search_param: String) -> Result<Vec<ClassroomPerson>
                 Err(reason)
             }
         },
-        Err(reason) => Err(reason)
+        Err(reason) => Err(reason),
     }
 }
 

frontend/src/OnlineClassroom/ClassroomUserCourses.tsx

@@ -0,0 +1,58 @@
+import { For, Show, createSignal, onMount } from "solid-js";
+import { LoadingStatus, backend, useLoading, wait } from "../utils/functions";
+import { JsonResult } from "../types/JsonResult";
+import { ClassroomCourse } from "../types/ClassroomCourse";
+import { LoadingIcon } from "../icons/LoadingIcon";
+
+export function ClassroomUserCourses(props: {userid: number}) {
+    const [courses, setCourses] = createSignal<Array<ClassroomCourse>>([]);
+    const {setError, status, setStatus} = useLoading();
+
+    const loadCourses = async() => {
+        setStatus(LoadingStatus.Loading);
+        setError("");
+
+        if (import.meta.env.DEV) await wait(1500);
+
+        backend.get<JsonResult<Array<ClassroomCourse>>>(`/api/classroom/course/${props.userid}`)
+            .then((res) => {
+                setCourses(res.data.Ok);
+
+                setStatus(LoadingStatus.Ok);
+            })
+            .catch((err) => {
+                console.log(err);
+                setError(err);
+                setStatus(LoadingStatus.Error);
+            });
+    };
+
+    onMount(loadCourses);
+
+    return (
+        <div class="w-full">
+            <h2 class="text-2xl">
+                Cursos matriculados:
+            </h2>
+
+            <div class="py-2 text-center">
+                <Show when={status() === LoadingStatus.Loading}>
+                    <span class="inline-block scale-[200%]">
+                        <LoadingIcon
+                            class="animate-spin mr-2"
+                            fill="var(--c-primary)"
+                            size={16}
+                        />
+                    </span>
+                </Show>
+            </div>
+
+            <For each={courses()}>
+                {(c) => (<p>{c.name}</p>)}
+            </For>
+            <Show when={status() === LoadingStatus.Ok && courses().length === 0}>
+                <p>Esta persona no está matriculada en ningún curso</p>
+            </Show>
+        </div>
+    );
+}

frontend/src/OnlineClassroom/index.tsx

@@ -4,6 +4,7 @@ import { Person } from "../types/Person";
 import { FilledCard } from "../components/FilledCard";
 import { ClassroomUserCreation } from "./ClassroomUserCreation";
 import { ClassroomVinculation } from "./ClassroomVinculation";
+import { ClassroomUserCourses } from "./ClassroomUserCourses";
 
 type TabType = "Vinculate" | "Create";
 
@@ -22,9 +23,7 @@ export function OnlineClassroom() {
                     />
                 </Show>
                 <Show when={person() !== null && person()!.person_classroom_id !== null}>
-                    <p>
+                    <ClassroomUserCourses userid={person()!.person_classroom_id!} />
-                        Esta persona tiene un usuario en el aula virtual.
-                    </p>
                 </Show>
 
             </div>

frontend/src/types/ClassroomCourse.ts

@@ -0,0 +1,3 @@
+export type ClassroomCourse = {
+    name: string
+}