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// Copyright (C) 2018 Vincent Ambo <mail@tazj.in>
//
// Converse is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see
// <http://www.gnu.org/licenses/>.
//! This module defines a rendering actor used for processing Converse
//! data into whatever format is needed by the templates and rendering
//! them.
use actix::prelude::*;
use errors::*;
use md5;
use models::*;
use tera::{escape_html, Context, Tera};
use chrono::prelude::{DateTime, Utc};
use comrak::{ComrakOptions, markdown_to_html};
pub struct Renderer {
pub tera: Tera,
pub comrak: ComrakOptions,
}
impl Actor for Renderer {
type Context = actix::Context<Self>;
}
/// Represents a data formatted for human consumption
#[derive(Debug, Serialize)]
struct FormattedDate(String);
impl From<DateTime<Utc>> for FormattedDate {
fn from(date: DateTime<Utc>) -> Self {
FormattedDate(format!("{}", date.format("%a %d %B %Y, %R")))
}
}
/// Message used to render the index page.
pub struct IndexPage {
pub threads: Vec<ThreadIndex>,
}
message!(IndexPage, Result<String>);
#[derive(Debug, Serialize)]
struct IndexThread {
id: i32,
title: String,
sticky: bool,
posted: FormattedDate,
author_name: String,
}
impl Handler<IndexPage> for Renderer {
type Result = Result<String>;
fn handle(&mut self, msg: IndexPage, _: &mut Self::Context) -> Self::Result {
let threads: Vec<IndexThread> = msg.threads
.into_iter()
.map(|thread| IndexThread {
id: thread.thread_id,
title: escape_html(&thread.title),
sticky: thread.sticky,
posted: thread.posted.into(),
author_name: thread.thread_author,
})
.collect();
let mut ctx = Context::new();
ctx.add("threads", &threads);
Ok(self.tera.render("index.html", &ctx)?)
}
}
/// Message used to render a thread.
pub struct ThreadPage {
pub current_user: Option<String>,
pub thread: Thread,
pub posts: Vec<Post>,
}
message!(ThreadPage, Result<String>);
// "Renderable" structures with data transformations applied.
#[derive(Debug, Serialize)]
struct RenderablePost {
id: i32,
body: String,
posted: FormattedDate,
author_name: String,
author_gravatar: String,
editable: bool,
}
/// This structure represents the transformed thread data with
/// Markdown rendering and other changes applied.
#[derive(Debug, Serialize)]
struct RenderableThreadPage {
id: i32,
title: String,
posts: Vec<RenderablePost>,
}
/// Helper function for computing Gravatar links.
fn md5_hex(input: &[u8]) -> String {
format!("{:x}", md5::compute(input))
}
fn prepare_thread(comrak: &ComrakOptions, page: ThreadPage) -> RenderableThreadPage {
let user = page.current_user;
let posts = page.posts.into_iter().map(|post| {
let editable = user.clone()
.map(|c| post.author_email.eq(&c))
.unwrap_or_else(|| false);
RenderablePost {
id: post.id,
body: markdown_to_html(&post.body, comrak),
posted: post.posted.into(),
author_name: post.author_name.clone(),
author_gravatar: md5_hex(post.author_email.as_bytes()),
editable,
}
}).collect();
RenderableThreadPage {
posts,
id: page.thread.id,
title: escape_html(&page.thread.title),
}
}
impl Handler<ThreadPage> for Renderer {
type Result = Result<String>;
fn handle(&mut self, msg: ThreadPage, _: &mut Self::Context) -> Self::Result {
let renderable = prepare_thread(&self.comrak, msg);
Ok(self.tera.render("thread.html", &renderable)?)
}
}
/// The different types of editing modes supported by the editing
/// template:
#[derive(Debug, Serialize)]
pub enum EditingMode {
NewThread,
PostReply,
EditPost,
}
impl Default for EditingMode {
fn default() -> EditingMode { EditingMode::NewThread }
}
/// This struct represents the context submitted to the template used
/// for rendering the new thread, edit post and reply to thread forms.
#[derive(Default, Serialize)]
pub struct FormContext {
/// Which editing mode is to be used by the template?
pub mode: EditingMode,
/// Potential alerts to display to the user (e.g. input validation
/// results)
pub alerts: Vec<&'static str>,
/// Either the title to be used in the subject field or the title
/// of the thread the user is responding to.
pub title: Option<String>,
/// Body of the post being edited, if present.
pub post: Option<String>,
/// ID of the thread being replied to or the post being edited.
pub id: Option<i32>,
}
/// Message used to render new thread page.
///
/// It can optionally contain a vector of warnings to display to the
/// user in alert boxes, such as input validation errors.
#[derive(Default)]
pub struct NewThreadPage {
pub alerts: Vec<&'static str>,
pub title: Option<String>,
pub post: Option<String>,
}
message!(NewThreadPage, Result<String>);
impl Handler<NewThreadPage> for Renderer {
type Result = Result<String>;
fn handle(&mut self, msg: NewThreadPage, _: &mut Self::Context) -> Self::Result {
let ctx = FormContext {
alerts: msg.alerts,
title: msg.title,
post: msg.post,
..Default::default()
};
Ok(self.tera.render("post.html", &ctx)?)
}
}
/// Message used to render post editing page.
pub struct EditPostPage {
pub id: i32,
pub post: String,
}
message!(EditPostPage, Result<String>);
impl Handler<EditPostPage> for Renderer {
type Result = Result<String>;
fn handle(&mut self, msg: EditPostPage, _: &mut Self::Context) -> Self::Result {
let ctx = FormContext {
mode: EditingMode::EditPost,
id: Some(msg.id),
post: Some(msg.post),
..Default::default()
};
Ok(self.tera.render("post.html", &ctx)?)
}
}
/// Message used to render search results
#[derive(Serialize)]
pub struct SearchResultPage {
pub query: String,
pub results: Vec<SearchResult>,
}
message!(SearchResultPage, Result<String>);
impl Handler<SearchResultPage> for Renderer {
type Result = Result<String>;
fn handle(&mut self, msg: SearchResultPage, _: &mut Self::Context) -> Self::Result {
Ok(self.tera.render("search.html", &msg)?)
}
}
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