| from flask import Blueprint |
| from flask import flash |
| from flask import g |
| from flask import redirect |
| from flask import render_template |
| from flask import request |
| from flask import url_for |
| from werkzeug.exceptions import abort |
|
|
| from flaskr.auth import login_required |
| from flaskr.db import get_db |
|
|
| bp = Blueprint("blog", __name__) |
|
|
|
|
| @bp.route("/") |
| def index(): |
| """Show all the posts, most recent first.""" |
| db = get_db() |
| posts = db.execute( |
| "SELECT p.id, title, body, created, author_id, username" |
| " FROM post p JOIN user u ON p.author_id = u.id" |
| " ORDER BY created DESC" |
| ).fetchall() |
| return render_template("blog/index.html", posts=posts) |
|
|
|
|
| def get_post(id, check_author=True): |
| """Get a post and its author by id. |
| |
| Checks that the id exists and optionally that the current user is |
| the author. |
| |
| :param id: id of post to get |
| :param check_author: require the current user to be the author |
| :return: the post with author information |
| :raise 404: if a post with the given id doesn't exist |
| :raise 403: if the current user isn't the author |
| """ |
| post = ( |
| get_db() |
| .execute( |
| "SELECT p.id, title, body, created, author_id, username" |
| " FROM post p JOIN user u ON p.author_id = u.id" |
| " WHERE p.id = ?", |
| (id,), |
| ) |
| .fetchone() |
| ) |
|
|
| if post is None: |
| abort(404, f"Post id {id} doesn't exist.") |
|
|
| if check_author and post["author_id"] != g.user["id"]: |
| abort(403) |
|
|
| return post |
|
|
|
|
| @bp.route("/create", methods=("GET", "POST")) |
| @login_required |
| def create(): |
| """Create a new post for the current user.""" |
| if request.method == "POST": |
| title = request.form["title"] |
| body = request.form["body"] |
| error = None |
|
|
| if not title: |
| error = "Title is required." |
|
|
| if error is not None: |
| flash(error) |
| else: |
| db = get_db() |
| db.execute( |
| "INSERT INTO post (title, body, author_id) VALUES (?, ?, ?)", |
| (title, body, g.user["id"]), |
| ) |
| db.commit() |
| return redirect(url_for("blog.index")) |
|
|
| return render_template("blog/create.html") |
|
|
|
|
| @bp.route("/<int:id>/update", methods=("GET", "POST")) |
| @login_required |
| def update(id): |
| """Update a post if the current user is the author.""" |
| post = get_post(id) |
|
|
| if request.method == "POST": |
| title = request.form["title"] |
| body = request.form["body"] |
| error = None |
|
|
| if not title: |
| error = "Title is required." |
|
|
| if error is not None: |
| flash(error) |
| else: |
| db = get_db() |
| db.execute( |
| "UPDATE post SET title = ?, body = ? WHERE id = ?", (title, body, id) |
| ) |
| db.commit() |
| return redirect(url_for("blog.index")) |
|
|
| return render_template("blog/update.html", post=post) |
|
|
|
|
| @bp.route("/<int:id>/delete", methods=("POST",)) |
| @login_required |
| def delete(id): |
| """Delete a post. |
| |
| Ensures that the post exists and that the logged in user is the |
| author of the post. |
| """ |
| get_post(id) |
| db = get_db() |
| db.execute("DELETE FROM post WHERE id = ?", (id,)) |
| db.commit() |
| return redirect(url_for("blog.index")) |
|
|
