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//! 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<Thread>,
}
impl Message for IndexPage {
type Result = Result<String>;
}
#[derive(Debug, Serialize)]
struct IndexThread {
id: i32,
title: String,
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.id,
title: escape_html(&thread.title),
posted: thread.posted.into(),
author_name: thread.author_name,
})
.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 thread: Thread,
pub posts: Vec<Post>,
}
impl Message for ThreadPage {
type Result = 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,
}
/// 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 posts = page.posts.into_iter().map(|post| {
RenderablePost {
id: post.id,
body: markdown_to_html(&post.body, comrak),
posted: post.posted.into(),
author_name: post.author_name,
author_gravatar: md5_hex(post.author_email.as_bytes()),
}
}).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);
let mut ctx = Context::new();
ctx.add("title", &renderable.title);
ctx.add("posts", &renderable.posts);
ctx.add("id", &renderable.id);
Ok(self.tera.render("thread.html", &ctx)?)
}
}
/// 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 body: Option<String>,
}
impl Message for NewThreadPage {
type Result = Result<String>;
}
impl Handler<NewThreadPage> for Renderer {
type Result = Result<String>;
fn handle(&mut self, msg: NewThreadPage, _: &mut Self::Context) -> Self::Result {
let mut ctx = Context::new();
ctx.add("alerts", &msg.alerts);
ctx.add("title", &msg.title.map(|s| escape_html(&s)));
ctx.add("body", &msg.body.map(|s| escape_html(&s)));
Ok(self.tera.render("new-thread.html", &ctx)?)
}
}
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