libreddit 0.30.1

Alternative private front-end to Reddit
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435

// CRATES
use crate::utils::{
	catch_random, error, filter_posts, format_num, format_url, get_filters, nsfw_landing, param, redirect, rewrite_urls, setting, template, val, Post, Preferences, Subreddit,
};
use crate::{client::json, server::ResponseExt, RequestExt};
use askama::Template;
use cookie::Cookie;
use hyper::{Body, Request, Response};
use time::{Duration, OffsetDateTime};

// STRUCTS
#[derive(Template)]
#[template(path = "subreddit.html")]
struct SubredditTemplate {
	sub: Subreddit,
	posts: Vec<Post>,
	sort: (String, String),
	ends: (String, String),
	prefs: Preferences,
	url: String,
	redirect_url: String,
	/// Whether the subreddit itself is filtered.
	is_filtered: bool,
	/// Whether all fetched posts are filtered (to differentiate between no posts fetched in the first place,
	/// and all fetched posts being filtered).
	all_posts_filtered: bool,
	/// Whether all posts were hidden because they are NSFW (and user has disabled show NSFW)
	all_posts_hidden_nsfw: bool,
	no_posts: bool,
}

#[derive(Template)]
#[template(path = "wiki.html")]
struct WikiTemplate {
	sub: String,
	wiki: String,
	page: String,
	prefs: Preferences,
	url: String,
}

#[derive(Template)]
#[template(path = "wall.html")]
struct WallTemplate {
	title: String,
	sub: String,
	msg: String,
	prefs: Preferences,
	url: String,
}

// SERVICES
pub async fn community(req: Request<Body>) -> Result<Response<Body>, String> {
	// Build Reddit API path
	let root = req.uri().path() == "/";
	let subscribed = setting(&req, "subscriptions");
	let front_page = setting(&req, "front_page");
	let post_sort = req.cookie("post_sort").map_or_else(|| "hot".to_string(), |c| c.value().to_string());
	let sort = req.param("sort").unwrap_or_else(|| req.param("id").unwrap_or(post_sort));

	let sub_name = req.param("sub").unwrap_or(if front_page == "default" || front_page.is_empty() {
		if subscribed.is_empty() {
			"popular".to_string()
		} else {
			subscribed.clone()
		}
	} else {
		front_page.clone()
	});
	let quarantined = can_access_quarantine(&req, &sub_name) || root;

	// Handle random subreddits
	if let Ok(random) = catch_random(&sub_name, "").await {
		return Ok(random);
	}

	if req.param("sub").is_some() && sub_name.starts_with("u_") {
		return Ok(redirect(["/user/", &sub_name[2..]].concat()));
	}

	// Request subreddit metadata
	let sub = if !sub_name.contains('+') && sub_name != subscribed && sub_name != "popular" && sub_name != "all" {
		// Regular subreddit
		subreddit(&sub_name, quarantined).await.unwrap_or_default()
	} else if sub_name == subscribed {
		// Subscription feed
		if req.uri().path().starts_with("/r/") {
			subreddit(&sub_name, quarantined).await.unwrap_or_default()
		} else {
			Subreddit::default()
		}
	} else {
		// Multireddit, all, popular
		Subreddit {
			name: sub_name.clone(),
			..Subreddit::default()
		}
	};

	// Return landing page if this post if this is NSFW community but the user
	// has disabled the display of NSFW content or if the instance is SFW-only.
	if sub.nsfw && (setting(&req, "show_nsfw") != "on" || crate::utils::sfw_only()) {
		return Ok(nsfw_landing(req).await.unwrap_or_default());
	}

	let path = format!("/r/{}/{}.json?{}&raw_json=1", sub_name.clone(), sort, req.uri().query().unwrap_or_default());
	let url = String::from(req.uri().path_and_query().map_or("", |val| val.as_str()));
	let redirect_url = url[1..].replace('?', "%3F").replace('&', "%26").replace('+', "%2B");
	let filters = get_filters(&req);

	// If all requested subs are filtered, we don't need to fetch posts.
	if sub_name.split('+').all(|s| filters.contains(s)) {
		template(SubredditTemplate {
			sub,
			posts: Vec::new(),
			sort: (sort, param(&path, "t").unwrap_or_default()),
			ends: (param(&path, "after").unwrap_or_default(), "".to_string()),
			prefs: Preferences::new(&req),
			url,
			redirect_url,
			is_filtered: true,
			all_posts_filtered: false,
			all_posts_hidden_nsfw: false,
			no_posts: false,
		})
	} else {
		match Post::fetch(&path, quarantined).await {
			Ok((mut posts, after)) => {
				let (_, all_posts_filtered) = filter_posts(&mut posts, &filters);
				let no_posts = posts.is_empty();
				let all_posts_hidden_nsfw = !no_posts && (posts.iter().all(|p| p.flags.nsfw) && setting(&req, "show_nsfw") != "on");
				template(SubredditTemplate {
					sub,
					posts,
					sort: (sort, param(&path, "t").unwrap_or_default()),
					ends: (param(&path, "after").unwrap_or_default(), after),
					prefs: Preferences::new(&req),
					url,
					redirect_url,
					is_filtered: false,
					all_posts_filtered,
					all_posts_hidden_nsfw,
					no_posts,
				})
			}
			Err(msg) => match msg.as_str() {
				"quarantined" | "gated" => quarantine(req, sub_name, msg),
				"private" => error(req, format!("r/{} is a private community", sub_name)).await,
				"banned" => error(req, format!("r/{} has been banned from Reddit", sub_name)).await,
				_ => error(req, msg).await,
			},
		}
	}
}

pub fn quarantine(req: Request<Body>, sub: String, restriction: String) -> Result<Response<Body>, String> {
	let wall = WallTemplate {
		title: format!("r/{} is {}", sub, restriction),
		msg: "Please click the button below to continue to this subreddit.".to_string(),
		url: req.uri().to_string(),
		sub,
		prefs: Preferences::new(&req),
	};

	Ok(
		Response::builder()
			.status(403)
			.header("content-type", "text/html")
			.body(wall.render().unwrap_or_default().into())
			.unwrap_or_default(),
	)
}

pub async fn add_quarantine_exception(req: Request<Body>) -> Result<Response<Body>, String> {
	let subreddit = req.param("sub").ok_or("Invalid URL")?;
	let redir = param(&format!("?{}", req.uri().query().unwrap_or_default()), "redir").ok_or("Invalid URL")?;
	let mut response = redirect(redir);
	response.insert_cookie(
		Cookie::build(&format!("allow_quaran_{}", subreddit.to_lowercase()), "true")
			.path("/")
			.http_only(true)
			.expires(cookie::Expiration::Session)
			.finish(),
	);
	Ok(response)
}

pub fn can_access_quarantine(req: &Request<Body>, sub: &str) -> bool {
	// Determine if the subreddit can be accessed
	setting(req, &format!("allow_quaran_{}", sub.to_lowercase())).parse().unwrap_or_default()
}

// Sub, filter, unfilter, or unsub by setting subscription cookie using response "Set-Cookie" header
pub async fn subscriptions_filters(req: Request<Body>) -> Result<Response<Body>, String> {
	let sub = req.param("sub").unwrap_or_default();
	let action: Vec<String> = req.uri().path().split('/').map(String::from).collect();

	// Handle random subreddits
	if sub == "random" || sub == "randnsfw" {
		if action.contains(&"filter".to_string()) || action.contains(&"unfilter".to_string()) {
			return Err("Can't filter random subreddit!".to_string());
		} else {
			return Err("Can't subscribe to random subreddit!".to_string());
		}
	}

	let query = req.uri().query().unwrap_or_default().to_string();

	let preferences = Preferences::new(&req);
	let mut sub_list = preferences.subscriptions;
	let mut filters = preferences.filters;

	// Retrieve list of posts for these subreddits to extract display names
	let posts = json(format!("/r/{}/hot.json?raw_json=1", sub), true).await?;
	let display_lookup: Vec<(String, &str)> = posts["data"]["children"]
		.as_array()
		.map(|list| {
			list
				.iter()
				.map(|post| {
					let display_name = post["data"]["subreddit"].as_str().unwrap_or_default();
					(display_name.to_lowercase(), display_name)
				})
				.collect::<Vec<_>>()
		})
		.unwrap_or_default();

	// Find each subreddit name (separated by '+') in sub parameter
	for part in sub.split('+').filter(|x| x != &"") {
		// Retrieve display name for the subreddit
		let display;
		let part = if part.starts_with("u_") {
			part
		} else if let Some(&(_, display)) = display_lookup.iter().find(|x| x.0 == part.to_lowercase()) {
			// This is already known, doesn't require separate request
			display
		} else {
			// This subreddit display name isn't known, retrieve it
			let path: String = format!("/r/{}/about.json?raw_json=1", part);
			display = json(path, true).await?;
			display["data"]["display_name"].as_str().ok_or_else(|| "Failed to query subreddit name".to_string())?
		};

		// Modify sub list based on action
		if action.contains(&"subscribe".to_string()) && !sub_list.contains(&part.to_owned()) {
			// Add each sub name to the subscribed list
			sub_list.push(part.to_owned());
			filters.retain(|s| s.to_lowercase() != part.to_lowercase());
			// Reorder sub names alphabetically
			sub_list.sort_by_key(|a| a.to_lowercase());
			filters.sort_by_key(|a| a.to_lowercase());
		} else if action.contains(&"unsubscribe".to_string()) {
			// Remove sub name from subscribed list
			sub_list.retain(|s| s.to_lowercase() != part.to_lowercase());
		} else if action.contains(&"filter".to_string()) && !filters.contains(&part.to_owned()) {
			// Add each sub name to the filtered list
			filters.push(part.to_owned());
			sub_list.retain(|s| s.to_lowercase() != part.to_lowercase());
			// Reorder sub names alphabetically
			filters.sort_by_key(|a| a.to_lowercase());
			sub_list.sort_by_key(|a| a.to_lowercase());
		} else if action.contains(&"unfilter".to_string()) {
			// Remove sub name from filtered list
			filters.retain(|s| s.to_lowercase() != part.to_lowercase());
		}
	}

	// Redirect back to subreddit
	// check for redirect parameter if unsubscribing/unfiltering from outside sidebar
	let path = if let Some(redirect_path) = param(&format!("?{}", query), "redirect") {
		format!("/{}", redirect_path)
	} else {
		format!("/r/{}", sub)
	};

	let mut response = redirect(path);

	// Delete cookie if empty, else set
	if sub_list.is_empty() {
		response.remove_cookie("subscriptions".to_string());
	} else {
		response.insert_cookie(
			Cookie::build("subscriptions", sub_list.join("+"))
				.path("/")
				.http_only(true)
				.expires(OffsetDateTime::now_utc() + Duration::weeks(52))
				.finish(),
		);
	}
	if filters.is_empty() {
		response.remove_cookie("filters".to_string());
	} else {
		response.insert_cookie(
			Cookie::build("filters", filters.join("+"))
				.path("/")
				.http_only(true)
				.expires(OffsetDateTime::now_utc() + Duration::weeks(52))
				.finish(),
		);
	}

	Ok(response)
}

pub async fn wiki(req: Request<Body>) -> Result<Response<Body>, String> {
	let sub = req.param("sub").unwrap_or_else(|| "reddit.com".to_string());
	let quarantined = can_access_quarantine(&req, &sub);
	// Handle random subreddits
	if let Ok(random) = catch_random(&sub, "/wiki").await {
		return Ok(random);
	}

	let page = req.param("page").unwrap_or_else(|| "index".to_string());
	let path: String = format!("/r/{}/wiki/{}.json?raw_json=1", sub, page);
	let url = req.uri().to_string();

	match json(path, quarantined).await {
		Ok(response) => template(WikiTemplate {
			sub,
			wiki: rewrite_urls(response["data"]["content_html"].as_str().unwrap_or("<h3>Wiki not found</h3>")),
			page,
			prefs: Preferences::new(&req),
			url,
		}),
		Err(msg) => {
			if msg == "quarantined" || msg == "gated" {
				quarantine(req, sub, msg)
			} else {
				error(req, msg).await
			}
		}
	}
}

pub async fn sidebar(req: Request<Body>) -> Result<Response<Body>, String> {
	let sub = req.param("sub").unwrap_or_else(|| "reddit.com".to_string());
	let quarantined = can_access_quarantine(&req, &sub);

	// Handle random subreddits
	if let Ok(random) = catch_random(&sub, "/about/sidebar").await {
		return Ok(random);
	}

	// Build the Reddit JSON API url
	let path: String = format!("/r/{}/about.json?raw_json=1", sub);
	let url = req.uri().to_string();

	// Send a request to the url
	match json(path, quarantined).await {
		// If success, receive JSON in response
		Ok(response) => template(WikiTemplate {
			wiki: rewrite_urls(&val(&response, "description_html")),
			// wiki: format!(
			// 	"{}<hr><h1>Moderators</h1><br><ul>{}</ul>",
			// 	rewrite_urls(&val(&response, "description_html"),
			// 	moderators(&sub, quarantined).await.unwrap_or(vec!["Could not fetch moderators".to_string()]).join(""),
			// ),
			sub,
			page: "Sidebar".to_string(),
			prefs: Preferences::new(&req),
			url,
		}),
		Err(msg) => {
			if msg == "quarantined" || msg == "gated" {
				quarantine(req, sub, msg)
			} else {
				error(req, msg).await
			}
		}
	}
}

// pub async fn moderators(sub: &str, quarantined: bool) -> Result<Vec<String>, String> {
// 	// Retrieve and format the html for the moderators list
// 	Ok(
// 		moderators_list(sub, quarantined)
// 			.await?
// 			.iter()
// 			.map(|m| format!("<li><a style=\"color: var(--accent)\" href=\"/u/{name}\">{name}</a></li>", name = m))
// 			.collect(),
// 	)
// }

// async fn moderators_list(sub: &str, quarantined: bool) -> Result<Vec<String>, String> {
// 	// Build the moderator list URL
// 	let path: String = format!("/r/{}/about/moderators.json?raw_json=1", sub);

// 	// Retrieve response
// 	json(path, quarantined).await.map(|response| {
// 		// Traverse json tree and format into list of strings
// 		response["data"]["children"]
// 			.as_array()
// 			.unwrap_or(&Vec::new())
// 			.iter()
// 			.filter_map(|moderator| {
// 				let name = moderator["name"].as_str().unwrap_or_default();
// 				if name.is_empty() {
// 					None
// 				} else {
// 					Some(name.to_string())
// 				}
// 			})
// 			.collect::<Vec<_>>()
// 	})
// }

// SUBREDDIT
async fn subreddit(sub: &str, quarantined: bool) -> Result<Subreddit, String> {
	// Build the Reddit JSON API url
	let path: String = format!("/r/{}/about.json?raw_json=1", sub);

	// Send a request to the url
	let res = json(path, quarantined).await?;

	// Metadata regarding the subreddit
	let members: i64 = res["data"]["subscribers"].as_u64().unwrap_or_default() as i64;
	let active: i64 = res["data"]["accounts_active"].as_u64().unwrap_or_default() as i64;

	// Fetch subreddit icon either from the community_icon or icon_img value
	let community_icon: &str = res["data"]["community_icon"].as_str().unwrap_or_default();
	let icon = if community_icon.is_empty() { val(&res, "icon_img") } else { community_icon.to_string() };

	Ok(Subreddit {
		name: val(&res, "display_name"),
		title: val(&res, "title"),
		description: val(&res, "public_description"),
		info: rewrite_urls(&val(&res, "description_html")),
		// moderators: moderators_list(sub, quarantined).await.unwrap_or_default(),
		icon: format_url(&icon),
		members: format_num(members),
		active: format_num(active),
		wiki: res["data"]["wiki_enabled"].as_bool().unwrap_or_default(),
		nsfw: res["data"]["over18"].as_bool().unwrap_or_default(),
	})
}