X-Git-Url: https://gitweb.ps.run/chirp/blobdiff_plain/8c4068986ff26fe12e46d6ba3208e279678ce524..76968d86e7b0d55c44fb9c2a3bd5352f3c46a54e:/src/main.zig

diff --git a/src/main.zig b/src/main.zig
index 65dab07..98da131 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -28,12 +28,20 @@ const User = struct {
     // TODO: choose sizes
     id: UserId,
     name: Username,
+    display_name: DisplayName,
     password_hash: PasswordHash,
     posts: PostList,
+    following: UserList,
+    followers: UserList,
+
+    post_lists: PostListList,
+    feeds: UserListList,
 };
 
 const Post = struct {
     id: PostId,
+    parent_id: ?PostId,
+    quote_id: ?PostId,
 
     user_id: UserId,
     time: Timestamp,
@@ -42,11 +50,20 @@ const Post = struct {
     downvotes: u64 = 0,
     votes: VoteList,
     comments: PostList,
-    // quote posts
+    quotes: PostList,
 
     text: PostText,
 };
 
+const SavedPostList = struct {
+    name: Name,
+    list: PostList,
+};
+const SavedUserList = struct {
+    name: Name,
+    list: UserList,
+};
+
 const Vote = struct {
     const Kind = enum { Up, Down };
 
@@ -57,20 +74,96 @@ const Vote = struct {
 const Id = u64;
 const Login = struct {
     user: User,
-    user_id: UserId,
     session_token: SessionToken,
 };
+const Name = std.BoundedArray(u8, 32);
 const UserId = enum(u64) { _ };
 const PostId = enum(u64) { _ };
 const Timestamp = i64;
-const Username = std.BoundedArray(u8, 16);
+const Username = std.BoundedArray(u8, 32);
+const DisplayName = std.BoundedArray(u8, 64);
 const PasswordHash = std.BoundedArray(u8, 128);
 const SessionToken = u64;
 const CookieValue = std.BoundedArray(u8, 128);
 const PostText = std.BoundedArray(u8, 1024);
-const PostList = db.SetList(PostId, void);
-const UserList = db.SetList(UserId, User);
+const PostList = db.Set(PostId);
+const UserList = db.Set(UserId);
 const VoteList = db.SetList(UserId, Vote);
+const PostListList = db.List(SavedPostList);
+const UserListList = db.List(SavedUserList);
+
+fn parse_enum(comptime E: type, buf: []const u8, base: u8) !E {
+    return @enumFromInt(try std.fmt.parseUnsigned(@typeInfo(E).Enum.tag_type, buf, base));
+}
+
+// https://developer.mozilla.org/en-US/docs/Glossary/Percent-encoding
+fn reencode(text: []const u8) !PostText {
+    var result = try PostText.init(0);
+
+    const len = @min(text.len, 1024); // TODO: PostText length
+
+    var idx: usize = 0;
+    while (idx < len) : (idx += 1) {
+        const c = text[idx];
+        if (c == '+') {
+            try result.append(' ');
+        } else if (c == '%') {
+            // special case of &#...
+            // assume only &#, no &#x
+            if (idx + 6 < text.len and std.mem.eql(u8, text[idx .. idx + 6], "%26%23")) {
+                const num_start = idx + 6;
+                var num_end = num_start;
+                while (num_end < text.len and std.ascii.isDigit(text[num_end])) {
+                    num_end += 1;
+                }
+
+                if (num_end + 2 < text.len and
+                    text[num_end] == '%' and
+                    text[num_end + 1] == '3' and
+                    std.ascii.toLower(text[num_end + 2]) == 'b')
+                {
+                    try std.fmt.format(result.writer(), "&#{s};", .{text[num_start..num_end]});
+                    idx = num_end + 2;
+                    continue;
+                }
+            }
+
+            try std.fmt.format(result.writer(), "&#x{s};", .{text[idx + 1 .. idx + 3]});
+            idx += 2;
+        } else {
+            try result.append(c);
+        }
+    }
+
+    return result;
+}
+
+fn decode(text: []const u8) !std.BoundedArray(u8, 1024) {
+    var result = try std.BoundedArray(u8, 1024).init(0);
+
+    const max_len = @min(text.len, 1024); // TODO: PostText length
+
+    var idx: usize = 0;
+    var len: usize = 0;
+    while (len < max_len and idx < text.len) : ({
+        idx += 1;
+        len += 1;
+    }) {
+        const c = text[idx];
+        if (c == '+') {
+            try result.append(' ');
+        } else if (c == '%') {
+            if (idx + 2 < text.len) {
+                try std.fmt.format(result.writer(), "{c}", .{try std.fmt.parseUnsigned(u8, text[idx + 1 .. idx + 3], 16)});
+            }
+            idx += 2;
+        } else {
+            try result.append(c);
+        }
+    }
+
+    return result;
+}
 
 const Chirp = struct {
     pub fn hash_password(password: []const u8) !PasswordHash {
@@ -106,11 +199,14 @@ const Chirp = struct {
         }
     }
 
-    pub fn register_user(env: *lmdb.Env, username: []const u8, password: []const u8) !bool {
+    pub fn register_user(env: lmdb.Env, username: []const u8, password: []const u8) !bool {
         const username_array = try Username.fromSlice(username);
+        const display_name = try DisplayName.fromSlice(username);
 
         const txn = try env.txn();
-        defer txn.commit() catch {};
+        defer txn.commit() catch |err| {
+            std.debug.print("error registering user: {}\n", .{err});
+        };
 
         const users = try Db.users(txn);
         const user_ids = try Db.user_ids(txn);
@@ -119,13 +215,17 @@ const Chirp = struct {
             return false;
         } else {
             const user_id = try db.Prng.gen(users.dbi, UserId);
-            const posts = try Db.posts(txn);
 
             try users.put(user_id, User{
                 .id = user_id,
                 .name = username_array,
+                .display_name = display_name,
                 .password_hash = try hash_password(password),
-                .posts = try PostList.init(posts.dbi),
+                .posts = try PostList.init(txn),
+                .following = try UserList.init(txn),
+                .followers = try UserList.init(txn),
+                .post_lists = try PostListList.init(txn),
+                .feeds = try UserListList.init(txn),
             });
 
             try user_ids.put(username_array, user_id);
@@ -135,7 +235,7 @@ const Chirp = struct {
     }
 
     pub fn login_user(
-        env: *lmdb.Env,
+        env: lmdb.Env,
         username: []const u8,
         password: []const u8,
     ) !SessionToken {
@@ -161,7 +261,7 @@ const Chirp = struct {
         }
     }
 
-    fn logout_user(env: *lmdb.Env, session_token: SessionToken) !void {
+    fn logout_user(env: lmdb.Env, session_token: SessionToken) !void {
         const txn = try env.txn();
         defer txn.commit() catch {};
 
@@ -169,7 +269,7 @@ const Chirp = struct {
         try sessions.del(session_token);
     }
 
-    fn post(env: *lmdb.Env, user_id: UserId, text: []const u8) !void {
+    fn append_post(env: lmdb.Env, user_id: UserId, post_list: PostList, parent_id: ?PostId, quote_id: ?PostId, text: []const u8) !PostId {
         var post_id: PostId = undefined;
 
         // TODO: do this in one commit
@@ -182,14 +282,18 @@ const Chirp = struct {
 
             const posts = try Db.posts(txn);
             post_id = try db.Prng.gen(posts.dbi, PostId);
-            const votes = try txn.dbi("votes");
+
+            const decoded_text = try reencode(text);
             try posts.put(post_id, Post{
                 .id = post_id,
+                .parent_id = parent_id,
+                .quote_id = quote_id,
                 .user_id = user_id,
                 .time = std.time.timestamp(),
-                .votes = try VoteList.init(votes),
-                .comments = try PostList.init(posts.dbi),
-                .text = try PostText.fromSlice(text),
+                .votes = try VoteList.init(txn),
+                .comments = try PostList.init(txn),
+                .quotes = try PostList.init(txn),
+                .text = decoded_text,
             });
         }
 
@@ -198,79 +302,124 @@ const Chirp = struct {
             txn = try env.txn();
             defer txn.commit() catch {};
 
-            const users = try Db.users(txn);
-            var user = try users.get(user_id);
+            var posts_view = try post_list.open(txn);
+            try posts_view.append(post_id);
+        }
+
+        if (quote_id != null) {
+            txn = try env.txn();
+            defer txn.commit() catch {};
 
             const posts = try Db.posts(txn);
-            var posts_view = try user.posts.open(posts.dbi);
-            try posts_view.append(post_id, {});
+            const quote_post = try posts.get(quote_id.?);
+            var quotes = try quote_post.quotes.open(txn);
+            try quotes.append(post_id);
         }
+
+        return post_id;
+    }
+
+    fn post(env: lmdb.Env, user_id: UserId, text: []const u8) !void {
+        var txn = try env.txn();
+        const users = try Db.users(txn);
+        const user = try users.get(user_id);
+        txn.abort();
+
+        const post_id = try append_post(env, user_id, user.posts, null, null, text);
+        _ = post_id;
+    }
+
+    fn comment(env: lmdb.Env, user_id: UserId, parent_post_id: PostId, text: []const u8) !void {
+        var txn = try env.txn();
+        const users = try Db.users(txn);
+        const user = try users.get(user_id);
+
+        const posts = try Db.posts(txn);
+        const parent_post = try posts.get(parent_post_id);
+        txn.abort();
+
+        const post_id = try append_post(env, user_id, parent_post.comments, parent_post_id, null, text);
+
+        txn = try env.txn();
+        var replies_view = try user.posts.open(txn);
+        try replies_view.append(post_id);
+        try txn.commit();
     }
 
-    fn vote(env: *lmdb.Env, post_id: PostId, user_id: UserId, kind: Vote.Kind) !void {
+    fn quote(env: lmdb.Env, user_id: UserId, quote_post_id: PostId, text: []const u8) !void {
+        var txn = try env.txn();
+        const users = try Db.users(txn);
+        const user = try users.get(user_id);
+        txn.abort();
+
+        const post_id = try append_post(env, user_id, user.posts, null, quote_post_id, text);
+        _ = post_id;
+    }
+
+    fn vote(env: lmdb.Env, post_id: PostId, user_id: UserId, kind: Vote.Kind) !void {
         const txn = try env.txn();
         defer txn.commit() catch {};
 
         const posts = try Db.posts(txn);
-        const votes = try txn.dbi("votes");
 
         var p = try posts.get(post_id);
-        var votes_view = try p.votes.open(votes);
+        var votes_view = try p.votes.open(txn);
+
+        var add_vote = true;
 
         if (try votes_view.has(user_id)) {
             const old_vote = try votes_view.get(user_id);
 
-            if (old_vote.kind == kind) {
-                return;
-            } else {
-                try votes_view.del(user_id);
+            add_vote = old_vote.kind != kind;
 
-                if (old_vote.kind == .Up) {
-                    p.upvotes -= 1;
-                } else {
-                    p.downvotes -= 1;
-                }
-                try posts.put(post_id, p);
+            try votes_view.del(user_id);
+
+            switch (old_vote.kind) {
+                .Up => p.upvotes -= 1,
+                .Down => p.downvotes -= 1,
             }
+            try posts.put(post_id, p);
         }
-        try votes_view.append(user_id, Vote{
-            .kind = kind,
-            .time = std.time.timestamp(),
-        });
 
-        if (kind == .Up) {
-            p.upvotes += 1;
-        } else {
-            p.downvotes += 1;
+        if (add_vote) {
+            try votes_view.append(user_id, Vote{
+                .kind = kind,
+                .time = std.time.timestamp(),
+            });
+
+            if (kind == .Up) {
+                p.upvotes += 1;
+            } else {
+                p.downvotes += 1;
+            }
+            try posts.put(post_id, p);
         }
-        try posts.put(post_id, p);
     }
 
-    fn unvote(env: *lmdb.Env, post_id: PostId, user_id: UserId) !void {
+    fn follow(env: lmdb.Env, user_id: UserId, user_id_to_follow: UserId) !void {
         const txn = try env.txn();
         defer txn.commit() catch {};
 
-        const posts = try Db.posts(txn);
-        const votes = try txn.dbi("votes");
-
-        var p = try posts.get(post_id);
-        var votes_view = try p.votes.open(votes);
+        const users = try Db.users(txn);
 
-        if (try votes_view.has(user_id)) {
-            const v = try votes_view.get(user_id);
+        const user = try users.get(user_id);
+        const user_to_follow = try users.get(user_id_to_follow);
 
-            if (v.kind == .Up) {
-                p.upvotes -= 1;
-            } else {
-                p.downvotes -= 1;
-            }
-            try posts.put(post_id, p);
+        var user_following = try user.following.open(txn);
+        var user_to_follow_followers = try user_to_follow.followers.open(txn);
 
-            try votes_view.del(user_id);
+        if ((user_following.has(user_id_to_follow) catch false) and (user_to_follow_followers.has(user_id) catch false)) {
+            try user_following.del(user_id_to_follow);
+            try user_to_follow_followers.del(user_id);
+        } else if (!(user_following.has(user_id_to_follow) catch true) and !(user_to_follow_followers.has(user_id) catch true)) {
+            try user_following.append(user_id_to_follow);
+            try user_to_follow_followers.append(user_id);
+        } else {
+            std.debug.print("Something went wrong when trying to unfollow\n", .{});
         }
     }
 
-    fn get_session_user_id(env: *lmdb.Env, session_token: SessionToken) !UserId {
+    fn get_session_user_id(env: lmdb.Env, session_token: SessionToken) !UserId {
         const txn = try env.txn();
         defer txn.abort();
 
@@ -279,7 +428,7 @@ const Chirp = struct {
         return try sessions.get(session_token);
     }
 
-    fn get_user(env: *lmdb.Env, user_id: UserId) !User {
+    fn get_user(env: lmdb.Env, user_id: UserId) !User {
         const txn = try env.txn();
         defer txn.abort();
 
@@ -291,10 +440,8 @@ const Chirp = struct {
 // }}}
 
 // html {{{
-fn html_form(res: *http.Response, comptime fmt_action: []const u8, args_action: anytype, inputs: anytype) !void {
-    try res.write("<form style=\"display: inline-block!important;\" action=\"", .{});
-    try res.write(fmt_action, args_action);
-    try res.write("\" method=\"post\">", .{});
+fn html_form(res: *http.Response, action: []const u8, inputs: anytype) !void {
+    try res.write("<form action=\"{s}\" method=\"post\">", .{action});
 
     inline for (inputs) |input| {
         switch (@typeInfo(@TypeOf(input))) {
@@ -316,84 +463,986 @@ fn html_form(res: *http.Response, comptime fmt_action: []const u8, args_action:
 // }}}
 
 // write {{{
+const TimeStr = std.BoundedArray(u8, 256);
+
+// http://howardhinnant.github.io/date_algorithms.html
+fn time_str(_t: i64) TimeStr {
+    const t: u64 = @intCast(_t);
+    var result = TimeStr.init(0) catch unreachable;
+
+    const nD = @divFloor(t, std.time.s_per_day);
+    const z: u64 = nD + 719468;
+    const era: u64 = (if (z >= 0) z else z - 146096) / 146097;
+    const doe: u64 = z - era * 146097; // [0, 146096]
+    const yoe: u64 = (doe - doe / 1460 + doe / 36524 - doe / 146096) / 365; // [0, 399]
+    const Y: u64 = yoe + era * 400;
+    const doy: u64 = doe - (365 * yoe + yoe / 4 - yoe / 100); // [0, 365]
+    const mp: u64 = (5 * doy + 2) / 153; // [0, 11]
+    const D: u64 = doy - (153 * mp + 2) / 5 + 1; // [1, 31]
+    const M: u64 = if (mp < 10) mp + 3 else mp - 9;
+
+    const h: u64 = @divFloor(t - nD * std.time.s_per_day, std.time.s_per_hour);
+    const m: u64 = @divFloor(t - nD * std.time.s_per_day - h * std.time.s_per_hour, std.time.s_per_min);
+    const s: u64 = t - nD * std.time.s_per_day - h * std.time.s_per_hour - m * std.time.s_per_min;
+
+    std.fmt.format(result.writer(), "<time><span>{:0>4}-{:0>2}-{:0>2} {:0>2}:{:0>2}:{:0>2} UTC</span><script>document.currentScript.parentElement.innerHTML=new Date({}).toLocaleString()</script></time>", .{ Y, M, D, h, m, s, t * 1000 }) catch unreachable;
+
+    return result;
+}
 fn write_header(res: *http.Response, logged_in: ?Login) !void {
     if (logged_in) |login| {
         try res.write(
-            \\<a href="/user/{s}">Home</a><br />
+            \\<a href="/">Home</a><br />
+        , .{});
+        try res.write(
+            \\<a href="/user/{s}">Profile</a><br />
         , .{login.user.name.constSlice()});
-        try html_form(res, "/logout", .{}, .{
+        try res.write(
+            \\<a href="/post">Post</a><br />
+        , .{});
+        try html_form(res, "/logout", .{
             \\type="submit" value="Logout"
         });
-        try html_form(res, "/quit", .{}, .{
-            \\type="submit" value="Quit"
-        });
-        try res.write("<br />", .{});
-        try html_form(res, "/post", .{}, .{
-            \\type="text" name="text"
-            ,
-            \\type="submit" value="Post"
-        });
+        try res.write("<br /><br />", .{});
     } else {
         try res.write(
             \\<a href="/">Home</a><br />
-            \\<a href="/register">Register</a>
-            \\<a href="/login">Login</a><br />
+            \\<form action="/register" method="post">
+            \\<input type="text" name="username" />
+            \\<input type="password" name="password" />
+            \\<input type="submit" value="Register" />
+            \\</form><br />
+            \\<form action="/login" method="post">
+            \\<input type="text" name="username" />
+            \\<input type="password" name="password" />
+            \\<input type="submit" value="Login" />
+            \\</form><br /><br />
         , .{});
-        try html_form(res, "/quit", .{}, .{
-            \\type="submit" value="Quit"
-        });
     }
 }
-fn write_posts(res: *http.Response, txn: lmdb.Txn, user: User, login: ?Login) !void {
-    const votes_dbi = try txn.dbi("votes");
+fn write_start(res: *http.Response) !void {
+    try res.write(
+        \\<!doctype html>
+        \\<html>
+        \\<head>
+        \\<link rel="icon" href="data:image/svg+xml,<svg xmlns=%22http://www.w3.org/2000/svg%22 viewBox=%220 0 100 100%22><text y=%22.9em%22 font-size=%2290%22>&#128035;</text></svg>">
+        \\<meta name="viewport" content="width=device-width, initial-scale=1.0" />
+        \\<style>
+        \\  form {
+        \\    display: inline-block;
+        \\  }
+        \\</style>
+        \\</head>
+        \\<body>
+    , .{});
+}
+fn write_end(res: *http.Response) !void {
+    try res.write("</body></html>", .{});
+}
+fn write_post(res: *http.Response, txn: lmdb.Txn, logged_in: ?Login, post_id: PostId, options: struct { recurse: u8 = 0, show_comment_field: bool = false }) !void {
     const posts = try Db.posts(txn);
-    const posts_view = try user.posts.open(posts.dbi);
+    const post = posts.get(post_id) catch {
+        res.redirect("/") catch {};
+        return;
+    };
+    const users = try Db.users(txn);
+    const user = try users.get(post.user_id);
+
+    try res.write(
+        \\<div>
+        \\<span><a href="/user/{s}">{s}</a>
+    , .{ user.name.constSlice(), user.display_name.constSlice() });
+    if (post.parent_id) |id| {
+        try res.write(" <a href=\"/post/{x}\">..</a>", .{@intFromEnum(id)});
+    }
+    try res.write(
+        \\ {s}</span><br />
+        \\<span>{s}</span><br />
+    , .{ time_str(post.time).constSlice(), post.text.constSlice() });
+
+    if (post.quote_id) |quote_id| {
+        try res.write("<div style=\"border: 1px solid black;\">", .{});
+        if (options.recurse > 0) {
+            try write_post(res, txn, logged_in, quote_id, .{ .recurse = options.recurse - 1 });
+        } else {
+            try res.write("<a href=\"/post/{x}\">...</a>", .{@intFromEnum(post_id)});
+        }
+        try res.write("</div>", .{});
+    }
 
-    var it = posts_view.iterator();
-    while (it.next()) |kv| {
-        const post_id = kv.key;
-        const post = try posts.get(post_id);
+    const comments_view = try post.comments.open(txn);
+    const quotes_view = try post.quotes.open(txn);
+    const votes_view = try post.votes.open(txn);
+
+    // Votes
+    const vote: ?Vote = if (logged_in != null and try votes_view.has(logged_in.?.user.id)) try votes_view.get(logged_in.?.user.id) else null;
+
+    if (vote != null and vote.?.kind == .Up) {
+        try html_form(res, "/upvote", .{
+            .{ "type=\"hidden\" value=\"{x}\" name=\"post_id\"", .{@intFromEnum(post.id)} },
+            .{ "type=\"submit\" value=\"&#x2B06; {}\"", .{post.upvotes} },
+        });
+    } else {
+        try html_form(res, "/upvote", .{
+            .{ "type=\"hidden\" value=\"{x}\" name=\"post_id\"", .{@intFromEnum(post.id)} },
+            .{ "type=\"submit\" value=\"&#x21E7; {}\"", .{post.upvotes} },
+        });
+    }
+    if (vote != null and vote.?.kind == .Down) {
+        try html_form(res, "/downvote", .{
+            .{ "type=\"hidden\" value=\"{x}\" name=\"post_id\"", .{@intFromEnum(post.id)} },
+            .{ "type=\"submit\" value=\"&#x2B07; {}\"", .{post.downvotes} },
+        });
+    } else {
+        try html_form(res, "/downvote", .{
+            .{ "type=\"hidden\" value=\"{x}\" name=\"post_id\"", .{@intFromEnum(post.id)} },
+            .{ "type=\"submit\" value=\"&#x21E9; {}\"", .{post.downvotes} },
+        });
+    }
+
+    // Comment Count
+    try res.write(
+        \\<a href="/post/{x}">&#x1F4AD; {}</a> 
+    , .{ @intFromEnum(post.id), comments_view.len() });
+
+    // Quote
+    try res.write(
+        \\<a href="/quoted/{x}">&#x1F501; {}</a> 
+    , .{ @intFromEnum(post.id), quotes_view.len() });
+
+    // Save to List
+    if (logged_in) |login| {
+        const lists_view = try login.user.post_lists.open(txn);
+        try res.write("<form action=\"/list_add\" method=\"post\">", .{});
+        try res.write("<select name=\"list_id\">", .{});
+        var it = lists_view.iterator();
+        // TODO: mark lists that already contain post
+        while (it.next()) |kv| {
+            const name = kv.val.name;
+            const id = kv.val.list.idx.?;
+            const list_view = try kv.val.list.open(txn);
+            try res.write("<option value=\"{x}\">{s}{s}</option>", .{ id, name.constSlice(), if (list_view.has(post_id) catch false) " *" else "" });
+        }
+        try res.write("</select>", .{});
+        try res.write("<input type=\"hidden\" name=\"post_id\" value=\"{x}\"></input>", .{@intFromEnum(post_id)});
+        try res.write("<input type=\"submit\" value=\"Save\"></input>", .{});
+        try res.write("</form>", .{});
+    }
+
+    // Comment field
+    // TODO: maybe always show comment field and prompt for login
+    if (options.show_comment_field and logged_in != null) {
+        try res.write("<br /><br />", .{});
+        try html_form(res, "/comment", .{
+            .{ "type=\"hidden\" value=\"{x}\" name=\"post_id\"", .{@intFromEnum(post.id)} },
+            "type=\"text\" name=\"text\" placeholder=\"Text\"",
+            "type=\"submit\" value=\"Comment\"",
+        });
+        try res.write("<br />", .{});
+    }
 
+    // Comments
+    if (options.recurse > 0 and comments_view.len() > 0) {
         try res.write(
-            \\<div>
-            \\<p>{s}</p>
-        , .{post.text.constSlice()});
+            \\<details{s}>
+            \\<summary>Comments</summary>
+        , .{if (options.recurse > 1) " open" else ""});
+        try res.write("<div style=\"margin: 10px;\">", .{});
+        var it = comments_view.iterator();
+        var count: u8 = 0;
+        while (it.next()) |comment_id| {
+            try write_post(res, txn, logged_in, comment_id, .{ .recurse = options.recurse - 1 });
+            try res.write("<br />", .{});
+            if (options.recurse == 1) {
+                count += 1;
+                if (count >= 3) break;
+            }
+        }
+        try res.write(
+            \\</div>
+            \\</details>
+        , .{});
+    }
 
-        const votes_view = try post.votes.open(votes_dbi);
-        const comments_view = try post.comments.open(posts.dbi);
+    try res.write(
+        \\</div>
+    , .{});
+}
+fn write_profile(res: *http.Response, txn: lmdb.Txn, logged_in: ?Login, user: User) !void {
+    const following = try user.following.open(txn);
+    const followers = try user.followers.open(txn);
+
+    try res.write(
+        \\<h2 style="display: inline;"><a href="/user/{s}">{s}</a></h2>
+    , .{
+        user.name.constSlice(), user.display_name.constSlice(),
+    });
+    if (logged_in != null and user.id != logged_in.?.user.id) {
+        const login = logged_in.?;
+
+        // follow/unfollow
+        if (try followers.has(login.user.id)) {
+            try html_form(res, "/follow", .{
+                .{ "type=\"hidden\" name=\"user.id\" value=\"{x}\"", .{@intFromEnum(user.id)} },
+                \\type="submit" value="Unfollow"
+            });
+        } else {
+            try html_form(res, "/follow", .{
+                .{ "type=\"hidden\" name=\"user.id\" value=\"{x}\"", .{@intFromEnum(user.id)} },
+                \\type="submit" value="Follow"
+            });
+        }
 
-        var has_voted: ?Vote.Kind = null;
+        // add to feed
+        const feeds_view = try login.user.feeds.open(txn);
+        try res.write("<form action=\"/feed_add\" method=\"post\">", .{});
+        try res.write("<select name=\"feed_id\">", .{});
+        var it = feeds_view.iterator();
+        while (it.next()) |kv| {
+            const name = kv.val.name;
+            const id = kv.val.list.idx.?;
+            const list_view = try kv.val.list.open(txn);
+            try res.write("<option value=\"{x}\">{s}{s}</option>", .{ id, name.constSlice(), if (list_view.has(user.id) catch false) " *" else "" });
+        }
+        try res.write("</select>", .{});
+        try res.write("<input type=\"hidden\" name=\"user_id\" value=\"{x}\"></input>", .{@intFromEnum(user.id)});
+        try res.write("<input type=\"submit\" value=\"Add to feed\"></input>", .{});
+        try res.write("</form>", .{});
+    }
+    try res.write(
+        \\ <a href="/following/{s}">{} following</a>
+        \\ <a href="/followers/{s}">{} followers</a>
+        \\<br />
+    , .{
+        user.name.constSlice(), following.len(),
+        user.name.constSlice(), followers.len(),
+    });
+
+    try res.write(
+        \\<a href="/all/{0s}">All Posts</a>
+        \\ <a href="/comments/{0s}">Comments</a>
+        \\ <a href="/quotes/{0s}">Quotes</a><br />
+    , .{
+        user.name.constSlice(),
+    });
+
+    if (logged_in != null and user.id == logged_in.?.user.id) {
+        try res.write(
+            \\<a href="/lists">Lists</a>
+            \\<a href="/feeds">Feeds</a>
+            \\<a href="/edit">Edit</a><br />
+            \\<br />
+        , .{});
+    }
 
-        if (login != null and try votes_view.has(login.?.user_id)) {
-            const vote = try votes_view.get(login.?.user_id);
+    try res.write("<br />", .{});
+}
+fn write_posts(res: *http.Response, txn: lmdb.Txn, logged_in: ?Login, post_list: PostList, options: struct {
+    show_posts: bool,
+    show_quotes: bool,
+    show_comments: bool,
+}) !void {
+    const posts_view = try post_list.open(txn);
+
+    var it = posts_view.reverse_iterator();
+    while (it.next()) |post_id| {
+        const posts = try Db.posts(txn);
+        const post = try posts.get(post_id);
+        if ((options.show_posts and (post.parent_id == null and post.quote_id == null)) or
+            (options.show_quotes and (post.quote_id != null)) or
+            (options.show_comments and (post.parent_id != null)))
+        {
+            try write_post(res, txn, logged_in, post_id, .{ .recurse = 1 });
+            try res.write("<br />", .{});
+        }
+    }
+}
+fn write_timeline(res: *http.Response, txn: lmdb.Txn, logged_in: ?Login, user_list: UserList) !void {
+    const users = try Db.users(txn);
+    const posts = try Db.posts(txn);
+
+    var newest_post_ids = try std.BoundedArray(PostId, 10).init(0); // TODO: TimelinePostsCount
+    var prev_newest_post: ?Post = null;
+
+    const following = try user_list.open(txn);
+
+    while (true) {
+        var newest_post: ?Post = null;
+
+        var following_it = following.iterator();
+        while (following_it.next()) |following_id| {
+            const followed_user = try users.get(following_id);
+            const followed_posts = try followed_user.posts.open(txn);
+
+            if (followed_posts.len() == 0) {
+                continue;
+            }
+
+            var followed_posts_it = followed_posts.reverse_iterator();
+            while (followed_posts_it.next()) |followed_post_id| {
+                const p = try posts.get(followed_post_id);
+
+                if ((prev_newest_post == null or p.time < prev_newest_post.?.time) and (newest_post == null or newest_post.?.time < p.time)) {
+                    newest_post = p;
+                    break;
+                }
+            }
+        }
+        if (newest_post) |post| {
+            newest_post_ids.append(post.id) catch break;
+            prev_newest_post = post;
+        } else {
+            break;
+        }
+    }
+
+    for (newest_post_ids.constSlice()) |post_id| {
+        try write_post(res, txn, logged_in, post_id, .{ .recurse = 1 });
+        try res.write("<br />", .{});
+    }
+}
+fn check_login(env: lmdb.Env, req: http.Request, res: *http.Response) !?Login {
+    var result: ?Login = null;
+
+    if (req.get_cookie("session_token")) |session_token_str| {
+        var remove_session_token = true;
+
+        if (std.fmt.parseUnsigned(SessionToken, session_token_str, 16) catch null) |session_token| {
+            // const session_token = try std.fmt.parseUnsigned(SessionToken, session_token_str, 10);
+            // const session_token = std.mem.bytesToValue(SessionToken, session_token_str);
+            if (Chirp.get_session_user_id(env, session_token) catch null) |user_id| {
+                const txn = try env.txn();
+                defer txn.abort();
+                const users = try Db.users(txn);
+
+                result = .{
+                    .user = try users.get(user_id),
+                    .session_token = session_token,
+                };
+
+                remove_session_token = false;
+            }
+        }
+
+        if (remove_session_token) {
+            try res.add_header(
+                "Set-Cookie",
+                .{"session_token=deleted; Expires=Thu, 01 Jan 1970 00:00:00 GMT"},
+            );
+        }
+    }
+
+    return result;
+}
+// }}}
+
+// GET {{{
+const GET = struct {
+    const Self = @This();
+
+    txn: lmdb.Txn,
+    req: http.Request,
+    res: *http.Response,
+    logged_in: ?Login,
+
+    fn handle(self: Self) !bool {
+        const ti = @typeInfo(Self);
+        inline for (ti.Struct.decls) |f_decl| {
+            const has_arg = f_decl.name.len > 1 and f_decl.name[f_decl.name.len - 1] == '/';
+            const match = if (has_arg) std.mem.startsWith(u8, self.req.target, f_decl.name) else std.mem.eql(u8, self.req.target, f_decl.name);
+
+            if (match) {
+                const f = @field(Self, f_decl.name);
+                const fi = @typeInfo(@TypeOf(f));
+                if (fi.Fn.params.len == 1) {
+                    try @call(.auto, f, .{self});
+                } else {
+                    const arg_type = fi.Fn.params[1].type.?;
+                    const arg_info = @typeInfo(arg_type);
+                    var arg: arg_type = undefined;
+                    const field = arg_info.Struct.fields[0];
+                    if (self.req.target.len <= f_decl.name.len) {
+                        return error.NoArgProvided;
+                    }
+                    const str = self.req.target[f_decl.name.len..self.req.target.len];
+                    const field_ti = @typeInfo(field.type);
+                    switch (field_ti) {
+                        // TODO: maybe handle BoundedArray?
+                        .Int => {
+                            @field(arg, field.name) = try std.fmt.parseUnsigned(field.type, str, 16);
+                        },
+                        .Enum => {
+                            @field(arg, field.name) = try parse_enum(field.type, str, 16);
+                        },
+                        else => {
+                            @field(arg, field.name) = str;
+                        },
+                    }
 
-            has_voted = vote.kind;
+                    try @call(.auto, f, .{ self, arg });
+                }
+                return true;
+            }
         }
+        return false;
+    }
 
-        if (has_voted != null and has_voted.? == .Up) {
-            try html_form(res, "/unupvote/{}", .{@intFromEnum(post_id)}, .{
-                .{ "type=\"submit\" value=\"&#x2B06; {}\"", .{post.upvotes} },
+    pub fn @"/user/"(self: Self, args: struct { username: []const u8 }) !void {
+        const user_ids = try Db.user_ids(self.txn);
+        if (user_ids.get(try Username.fromSlice(args.username))) |user_id| {
+            const users = try Db.users(self.txn);
+            const user = try users.get(user_id);
+
+            try write_profile(self.res, self.txn, self.logged_in, user);
+
+            try write_posts(self.res, self.txn, self.logged_in, user.posts, .{
+                .show_posts = true,
+                .show_quotes = false,
+                .show_comments = false,
+            });
+        } else |err| {
+            try self.res.write(
+                \\<p>User not found [{}]</p>
+            , .{err});
+        }
+    }
+    pub fn @"/comments/"(self: Self, args: struct { username: []const u8 }) !void {
+        const user_ids = try Db.user_ids(self.txn);
+        if (user_ids.get(try Username.fromSlice(args.username))) |user_id| {
+            const users = try Db.users(self.txn);
+            const user = try users.get(user_id);
+
+            try write_profile(self.res, self.txn, self.logged_in, user);
+
+            try write_posts(self.res, self.txn, self.logged_in, user.posts, .{
+                .show_posts = false,
+                .show_quotes = false,
+                .show_comments = true,
             });
+        } else |err| {
+            try self.res.write(
+                \\<p>User not found [{}]</p>
+            , .{err});
+        }
+    }
+    pub fn @"/quotes/"(self: Self, args: struct { username: []const u8 }) !void {
+        const user_ids = try Db.user_ids(self.txn);
+        if (user_ids.get(try Username.fromSlice(args.username))) |user_id| {
+            const users = try Db.users(self.txn);
+            const user = try users.get(user_id);
+
+            try write_profile(self.res, self.txn, self.logged_in, user);
+
+            try write_posts(self.res, self.txn, self.logged_in, user.posts, .{
+                .show_posts = false,
+                .show_quotes = true,
+                .show_comments = false,
+            });
+        } else |err| {
+            try self.res.write(
+                \\<p>User not found [{}]</p>
+            , .{err});
+        }
+    }
+    pub fn @"/all/"(self: Self, args: struct { username: []const u8 }) !void {
+        const user_ids = try Db.user_ids(self.txn);
+        if (user_ids.get(try Username.fromSlice(args.username))) |user_id| {
+            const users = try Db.users(self.txn);
+            const user = try users.get(user_id);
+
+            try write_profile(self.res, self.txn, self.logged_in, user);
+
+            try write_posts(self.res, self.txn, self.logged_in, user.posts, .{
+                .show_posts = true,
+                .show_quotes = true,
+                .show_comments = true,
+            });
+        } else |err| {
+            try self.res.write(
+                \\<p>User not found [{}]</p>
+            , .{err});
+        }
+    }
+    pub fn @"/following/"(self: Self, args: struct { username: []const u8 }) !void {
+        const user_ids = try Db.user_ids(self.txn);
+        if (user_ids.get(try Username.fromSlice(args.username))) |user_id| {
+            const users = try Db.users(self.txn);
+            const user = try users.get(user_id);
+
+            const following = try user.following.open(self.txn);
+            var it = following.iterator();
+
+            try self.res.write(
+                \\<h2><a href="/user/{s}">{s}</a> follows:</h2>
+            , .{ user.name.constSlice(), user.display_name.constSlice() });
+
+            while (it.next()) |following_id| {
+                const following_user = try users.get(following_id);
+
+                try self.res.write(
+                    \\<a href="/user/{s}">{s}</a><br />
+                , .{ following_user.name.constSlice(), following_user.display_name.constSlice() });
+            }
+        } else |err| {
+            try self.res.write(
+                \\<p>User not found [{}]</p>
+            , .{err});
+        }
+    }
+    pub fn @"/followers/"(self: Self, args: struct { username: []const u8 }) !void {
+        const user_ids = try Db.user_ids(self.txn);
+        if (user_ids.get(try Username.fromSlice(args.username))) |user_id| {
+            const users = try Db.users(self.txn);
+            const user = try users.get(user_id);
+
+            const followers = try user.followers.open(self.txn);
+            var it = followers.iterator();
+
+            try self.res.write(
+                \\<h2><a href="/user/{s}">{s}</a> followers:</h2>
+            , .{ user.name.constSlice(), user.display_name.constSlice() });
+
+            while (it.next()) |follower_id| {
+                const follower_user = try users.get(follower_id);
+
+                try self.res.write(
+                    \\<a href="/user/{s}">{s}</a><br />
+                , .{ follower_user.name.constSlice(), follower_user.display_name.constSlice() });
+            }
+        } else |err| {
+            try self.res.write(
+                \\<p>User not found [{}]</p>
+            , .{err});
+        }
+    }
+    pub fn @"/post/"(self: Self, args: struct { post_id: PostId }) !void {
+        try write_post(self.res, self.txn, self.logged_in, args.post_id, .{
+            .recurse = 3, // TODO: factor out
+            .show_comment_field = true,
+        });
+    }
+    pub fn @"/quoted/"(self: Self, args: struct { post_id: PostId }) !void {
+        const posts = try Db.posts(self.txn);
+        const post = try posts.get(args.post_id);
+
+        const referer = if (self.req.get_header("Referer")) |ref| ref else self.req.target;
+
+        if (self.logged_in != null) {
+            try html_form(self.res, "/quote", .{
+                .{ "type=\"hidden\" name=\"referer\" value=\"{s}\"", .{referer} },
+                .{ "type=\"hidden\" name=\"post_id\" value=\"{x}\"", .{@intFromEnum(post.id)} },
+                "type=\"text\" name=\"text\" placeholder=\"Text\"",
+                "type=\"submit\" value=\"Quote\"",
+            });
+            try self.res.write("<br />", .{});
+        }
+
+        const quotes_view = try post.quotes.open(self.txn);
+        var it = quotes_view.iterator();
+        while (it.next()) |quote_id| {
+            try write_post(self.res, self.txn, self.logged_in, quote_id, .{ .recurse = 1 });
+            try self.res.write("<br />", .{});
+        }
+    }
+    pub fn @"/list/"(self: Self, args: struct { list_id: PostList.Index }) !void {
+        try write_posts(self.res, self.txn, self.logged_in, PostList{ .idx = args.list_id }, .{
+            .show_posts = true,
+            .show_quotes = true,
+            .show_comments = true,
+        });
+    }
+    pub fn @"/lists"(self: Self) !void {
+        if (self.logged_in) |login| {
+            const post_lists_view = try login.user.post_lists.open(self.txn);
+
+            try html_form(self.res, "/create_list", .{
+                "type=\"text\" name=\"name\"",
+                "type=\"submit\" value=\"Add\"",
+            });
+
+            try self.res.write("<br /><br />", .{});
+
+            var it = post_lists_view.iterator();
+            while (it.next()) |kv| {
+                const name = kv.val.name;
+                const post_list = kv.val.list;
+                try self.res.write(
+                    \\<a href="/list/{x}">{s}</a> 
+                , .{ post_list.idx.?, name.constSlice() });
+                try html_form(self.res, "/delete_list", .{
+                    .{ "type=\"hidden\" name=\"list_id\" value=\"{x}\"", .{kv.key} },
+                    "type=\"submit\" value=\"Delete\"",
+                });
+                try self.res.write("<br />", .{});
+            }
         } else {
-            try html_form(res, "/upvote/{}", .{@intFromEnum(post_id)}, .{
-                .{ "type=\"submit\" value=\"&#x2B06; {}\"", .{post.upvotes} },
+            try self.res.write("not logged in", .{});
+        }
+    }
+    pub fn @"/feed/"(self: Self, args: struct { feed_id: UserList.Index }) !void {
+        try write_timeline(self.res, self.txn, self.logged_in, UserList{ .idx = args.feed_id });
+    }
+    pub fn @"/feeds"(self: Self) !void {
+        if (self.logged_in) |login| {
+            const feeds_view = try login.user.feeds.open(self.txn);
+
+            try html_form(self.res, "/create_feed", .{
+                "type=\"text\" name=\"name\"",
+                "type=\"submit\" value=\"Add\"",
             });
+
+            try self.res.write("<br /><br />", .{});
+
+            var it = feeds_view.iterator();
+            while (it.next()) |kv| {
+                const name = kv.val.name;
+                const user_list = kv.val.list;
+                try self.res.write(
+                    \\<a href="/feed/{x}">{s}</a> 
+                , .{ user_list.idx.?, name.constSlice() });
+                try html_form(self.res, "/delete_feed", .{
+                    .{ "type=\"hidden\" name=\"list_id\" value=\"{x}\"", .{kv.key} },
+                    "type=\"submit\" value=\"Delete\"",
+                });
+                try self.res.write("<br />", .{});
+            }
+        } else {
+            try self.res.write("not logged in", .{});
         }
-        if (has_voted != null and has_voted.? == .Down) {
-            try html_form(res, "/undownvote/{}", .{@intFromEnum(post_id)}, .{
-                .{ "type=\"submit\" value=\"&#x2B07; {}\"", .{post.downvotes} },
+    }
+    pub fn @"/post"(self: Self) !void {
+        if (self.logged_in) |login| {
+            _ = login;
+            const referer = if (self.req.get_header("Referer")) |ref| ref else self.req.target;
+
+            try html_form(self.res, "/post", .{
+                .{ "type=\"hidden\" name=\"referer\" value=\"{s}\"", .{referer} },
+                "type=\"text\" name=\"text\"",
+                "type=\"submit\" value=\"Post\"",
             });
         } else {
-            try html_form(res, "/downvote/{}", .{@intFromEnum(post_id)}, .{
-                .{ "type=\"submit\" value=\"&#x2B07; {}\"", .{post.downvotes} },
+            try self.res.write("not logged in", .{});
+        }
+    }
+    pub fn @"/edit"(self: Self) !void {
+        if (self.logged_in) |login| {
+            try self.res.write("<br />Username: ", .{});
+            try html_form(self.res, "/set_username", .{
+                .{ "type=\"text\" name=\"username\" placeholder=\"{s}\"", .{login.user.name.constSlice()} },
+                "type=\"submit\" value=\"Change\"",
+            });
+            try self.res.write("<br />Display Name: ", .{});
+            try html_form(self.res, "/set_display_name", .{
+                .{ "type=\"text\" name=\"display_name\" placeholder=\"{s}\"", .{login.user.display_name.constSlice()} },
+                "type=\"submit\" value=\"Change\"",
+            });
+            try self.res.write("<br />Password: ", .{});
+            try html_form(self.res, "/set_password", .{
+                "type=\"text\" name=\"password\"",
+                "type=\"submit\" value=\"Change\"",
             });
+        } else {
+            try self.res.write("not logged in", .{});
         }
-        try res.write(
-            \\<span>&#x1F4AD; {}</span>
-            \\</div>
-        , .{comments_view.len()});
     }
-}
+    pub fn @"/"(self: Self) !void {
+        if (self.logged_in) |login| {
+            try write_timeline(self.res, self.txn, self.logged_in, login.user.following);
+        } else {
+            // TODO: generic home
+            try self.res.write("Homepage", .{});
+        }
+    }
+};
+// }}}
+
+// POST {{{
+const POST = struct {
+    const Self = @This();
+
+    env: lmdb.Env,
+    req: http.Request,
+    res: *http.Response,
+    logged_in: ?Login,
+
+    pub fn handle(self: Self) !bool {
+        const ti = @typeInfo(Self);
+        inline for (ti.Struct.decls) |f_decl| {
+            if (std.mem.eql(u8, f_decl.name, self.req.target)) {
+                const f = @field(Self, f_decl.name);
+                const fi = @typeInfo(@TypeOf(f));
+                if (fi.Fn.params.len == 1) {
+                    _ = try @call(.auto, f, .{self});
+                } else {
+                    const args_type = fi.Fn.params[fi.Fn.params.len - 1].type.?;
+                    const argsi = @typeInfo(args_type);
+                    var args: args_type = undefined;
+                    inline for (argsi.Struct.fields) |field| {
+                        const str = self.req.get_value(field.name) orelse return error.ArgNotFound;
+                        const field_ti = @typeInfo(field.type);
+                        switch (field_ti) {
+                            .Int => {
+                                @field(args, field.name) = try std.fmt.parseUnsigned(field.type, str, 16);
+                            },
+                            .Enum => {
+                                @field(args, field.name) = try parse_enum(field.type, str, 16);
+                            },
+                            else => {
+                                @field(args, field.name) = str;
+                            },
+                        }
+                    }
+                    try @call(.auto, f, .{ self, args });
+                }
+                return true;
+            }
+        }
+        return false;
+    }
+
+    pub fn @"/register"(self: Self, args: struct { username: []const u8, password: []const u8 }) !void {
+        // TODO: handle args not supplied
+        std.debug.print("New user: {s} {s}\n", .{ args.username, args.password });
+        _ = try Chirp.register_user(self.env, args.username, args.password);
+    }
+    pub fn @"/login"(self: Self, args: struct { username: []const u8, password: []const u8 }) !void {
+        // TODO: handle args not supplied
+        std.debug.print("New login: {s} {s}\n", .{ args.username, args.password });
+        if (Chirp.login_user(self.env, args.username, args.password)) |session_token| {
+            self.res.status = .see_other;
+            try self.res.add_header(
+                "Set-Cookie",
+                .{ "session_token={x}; HttpOnly", .{session_token} },
+            );
+        } else |err| {
+            std.debug.print("login_user err: {}\n", .{err});
+        }
+    }
+    pub fn @"/logout"(self: Self) !void {
+        if (self.logged_in) |login| {
+            try Chirp.logout_user(self.env, login.session_token);
+
+            try self.res.add_header(
+                "Set-Cookie",
+                .{"session_token=deleted; Expires=Thu, 01 Jan 1970 00:00:00 GMT"},
+            );
+        }
+    }
+    pub fn @"/set_username"(self: Self, args: struct { username: []const u8 }) !void {
+        const login = self.logged_in orelse return error.NotLoggedIn;
+        const username = try Username.fromSlice(args.username);
+
+        const txn = try self.env.txn();
+        defer txn.commit() catch {};
+
+        const user_ids = try Db.user_ids(txn);
+
+        if (!try user_ids.has(username)) {
+            try user_ids.del(login.user.name);
+            try user_ids.put(username, login.user.id);
+
+            const users = try Db.users(txn);
+            var user = login.user;
+            user.name = username;
+            try users.put(login.user.id, user);
+        }
+    }
+    pub fn @"/set_display_name"(self: Self, args: struct { display_name: []const u8 }) !void {
+        const login = self.logged_in orelse return error.NotLoggedIn;
+        const display_name = try DisplayName.fromSlice(args.display_name);
+
+        const txn = try self.env.txn();
+        defer txn.commit() catch {};
+
+        const users = try Db.users(txn);
+        var user = login.user;
+        user.display_name = display_name;
+        try users.put(login.user.id, user);
+    }
+    pub fn @"/set_password"(self: Self, args: struct { password: []const u8 }) !void {
+        const login = self.logged_in orelse return error.NotLoggedIn;
+
+        const txn = try self.env.txn();
+        defer txn.commit() catch {};
+
+        const users = try Db.users(txn);
+        var user = login.user;
+        user.password_hash = try Chirp.hash_password(args.password);
+        try users.put(login.user.id, user);
+    }
+    pub fn @"/post"(self: Self) !void {
+        if (self.logged_in) |login| {
+            const text = self.req.get_value("text").?;
+            const has_referer = self.req.get_value("referer");
+
+            try Chirp.post(self.env, login.user.id, text);
+
+            if (has_referer) |r| {
+                const decoded = try decode(r);
+                try self.res.redirect(decoded.constSlice());
+            }
+        }
+    }
+    pub fn @"/comment"(self: Self) !void {
+        if (self.logged_in) |login| {
+            const text = self.req.get_value("text") orelse return error.NoText;
+            const post_id_str = self.req.get_value("post_id") orelse return error.NoPostId;
+            const post_id = try parse_enum(PostId, post_id_str, 16);
+
+            try Chirp.comment(self.env, login.user.id, post_id, text);
+        }
+    }
+    pub fn @"/quote"(self: Self) !void {
+        if (self.logged_in) |login| {
+            const text = self.req.get_value("text") orelse return error.NoText;
+            const post_id_str = self.req.get_value("post_id") orelse return error.NoPostId;
+            const has_referer = self.req.get_value("referer");
+
+            const post_id = try parse_enum(PostId, post_id_str, 16);
+
+            try Chirp.quote(self.env, login.user.id, post_id, text);
+
+            if (has_referer) |r| {
+                const decoded = try decode(r);
+                try self.res.redirect(decoded.constSlice());
+            }
+        }
+    }
+    // TODO: add arguments instead of parsing manually
+    pub fn @"/create_list"(self: Self) !void {
+        if (self.logged_in) |login| {
+            const name_str = self.req.get_value("name") orelse return error.NoName;
+            const name = try Name.fromSlice(name_str);
+            // TODO: decode name
+
+            var txn = try self.env.txn();
+            const postlist = try PostList.init(txn);
+            try txn.commit();
+
+            txn = try self.env.txn();
+            var post_lists_view = try login.user.post_lists.open(txn);
+            _ = try post_lists_view.append(.{ .name = name, .list = postlist });
+            try txn.commit();
+        }
+    }
+    pub fn @"/delete_list"(self: Self, args: struct { list_id: PostList.Index }) !void {
+        if (self.logged_in) |login| {
+            var post_list: ?PostList = null;
+            {
+                const txn = try self.env.txn();
+                defer txn.commit() catch {};
+                var post_lists_view = try login.user.post_lists.open(txn);
+                post_list = (try post_lists_view.get(args.list_id)).list;
+                try post_lists_view.del(args.list_id);
+            }
+            if (post_list != null) {
+                const txn = try self.env.txn();
+                defer txn.commit() catch {};
+                var list_view = try post_list.?.open(txn);
+                try list_view.clear();
+            }
+        }
+    }
+    pub fn @"/list_add"(self: Self, args: struct { list_id: PostList.Index, post_id: PostId }) !void {
+        if (self.logged_in) |login| {
+            _ = login;
+
+            const txn = try self.env.txn();
+            defer txn.commit() catch {};
+
+            const post_list = PostList{ .idx = args.list_id };
+            var post_list_view = try post_list.open(txn);
+            if (try post_list_view.has(args.post_id)) {
+                try post_list_view.del(args.post_id);
+            } else {
+                try post_list_view.append(args.post_id);
+            }
+        }
+    }
+    pub fn @"/create_feed"(self: Self) !void {
+        if (self.logged_in) |login| {
+            const name_str = self.req.get_value("name") orelse return error.NoName;
+            const name = try Name.fromSlice(name_str);
+
+            var txn = try self.env.txn();
+            const userlist = try UserList.init(txn);
+            try txn.commit();
+
+            txn = try self.env.txn();
+            var feeds_view = try login.user.feeds.open(txn);
+            _ = try feeds_view.append(.{ .name = name, .list = userlist });
+            try txn.commit();
+        }
+    }
+    pub fn @"/delete_feed"(self: Self, args: struct { list_id: UserList.Index }) !void {
+        if (self.logged_in) |login| {
+            var user_list: ?UserList = null;
+
+            {
+                const txn = try self.env.txn();
+                defer txn.commit() catch {};
+                var feeds_view = try login.user.feeds.open(txn);
+                user_list = (try feeds_view.get(args.list_id)).list;
+                try feeds_view.del(args.list_id);
+            }
+            if (user_list != null) {
+                const txn = try self.env.txn();
+                defer txn.commit() catch {};
+                var list_view = try user_list.?.open(txn);
+                try list_view.clear();
+            }
+        }
+    }
+    pub fn @"/feed_add"(self: Self, args: struct { feed_id: UserList.Index, user_id: UserId }) !void {
+        if (self.logged_in) |login| {
+            _ = login;
+
+            const txn = try self.env.txn();
+            defer txn.commit() catch {};
+
+            const user_list = UserList{ .idx = args.feed_id };
+            var user_list_view = try user_list.open(txn);
+            if (try user_list_view.has(args.user_id)) {
+                try user_list_view.del(args.user_id);
+            } else {
+                try user_list_view.append(args.user_id);
+            }
+        }
+    }
+    pub fn @"/upvote"(self: Self) !void {
+        const login = self.logged_in orelse return error.NotLoggedIn;
+
+        const post_id_str = self.req.get_value("post_id") orelse return error.NoPostId;
+        const post_id: PostId = @enumFromInt(try std.fmt.parseUnsigned(u64, post_id_str, 16));
+
+        try Chirp.vote(self.env, post_id, login.user.id, .Up);
+    }
+    pub fn @"/downvote"(self: Self) !void {
+        const login = self.logged_in orelse return error.NotLoggedIn;
+
+        const post_id_str = self.req.get_value("post_id") orelse return error.NoPostId;
+        const post_id: PostId = @enumFromInt(try std.fmt.parseUnsigned(u64, post_id_str, 16));
+
+        try Chirp.vote(self.env, post_id, login.user.id, .Down);
+    }
+    pub fn @"/follow"(self: Self) !void {
+        const login = self.logged_in orelse return error.NotLoggedIn;
+
+        const user_id_str = self.req.get_value("user_id") orelse return error.NoUserId;
+        const user_id: UserId = @enumFromInt(try std.fmt.parseUnsigned(u64, user_id_str, 16));
+
+        try Chirp.follow(self.env, login.user.id, user_id);
+    }
+    pub fn @"/quit"(self: Self) !void {
+        if (self.req.get_header("Referer")) |ref| {
+            try self.res.redirect(ref);
+        } else {
+            try self.res.redirect("/");
+        }
+        try self.res.send();
+        // break :accept;
+    }
+};
 // }}}
 
 fn list_users(env: lmdb.Env) !void {
@@ -452,8 +1501,13 @@ fn list_posts(env: lmdb.Env) !void {
 }
 
 const ReqBufferSize = 4096;
-const ResHeadBufferSize = 1024 * 16;
-const ResBodyBufferSize = 1024 * 16;
+const ResHeadBufferSize = 1024 * 64;
+const ResBodyBufferSize = 1024 * 64;
+
+// TODO: static?
+var req_buffer: [ReqBufferSize]u8 = undefined;
+var res_head_buffer: [ResHeadBufferSize]u8 = undefined;
+var res_body_buffer: [ResBodyBufferSize]u8 = undefined;
 
 pub fn main() !void {
     // server
@@ -464,16 +1518,24 @@ pub fn main() !void {
     var env = try lmdb.Env.open("db", 1024 * 1024 * 10);
     defer env.close();
 
-    // std.debug.print("Users:\n", .{});
-    // try list_users(env);
-    // std.debug.print("User IDs:\n", .{});
-    // try list_user_ids(env);
-    // std.debug.print("Sessions:\n", .{});
-    // try list_sessions(env);
-    // std.debug.print("Posts:\n", .{});
-    // try list_posts(env);
+    std.debug.print("Users:\n", .{});
+    try list_users(env);
+    std.debug.print("User IDs:\n", .{});
+    try list_user_ids(env);
+    std.debug.print("Sessions:\n", .{});
+    try list_sessions(env);
+    std.debug.print("Posts:\n", .{});
+    try list_posts(env);
 
-    try handle_connection(&server, &env);
+    while (true) {
+        server.wait();
+        while (true) {
+            const req = (server.next_request(&req_buffer) catch break) orelse break;
+            handle_request(env, req) catch {
+                try handle_error(env, req);
+            };
+        }
+    }
     // const ThreadCount = 1;
     // var ts: [ThreadCount]std.Thread = undefined;
 
@@ -487,221 +1549,64 @@ pub fn main() !void {
     std.debug.print("done\n", .{});
 }
 
-fn handle_connection(server: *http.Server, env: *lmdb.Env) !void {
-    // TODO: static?
-    var req_buffer: [ReqBufferSize]u8 = undefined;
-    var res_head_buffer: [ResHeadBufferSize]u8 = undefined;
-    var res_body_buffer: [ResBodyBufferSize]u8 = undefined;
-
-    accept: while (true) {
-        server.wait();
-
-        while (try server.next_request(&req_buffer)) |req| {
-            // std.debug.print("[{}]: {s}\n", .{ req.method, req.target });
-
-            // reponse
-            var res = http.Response.init(req.fd, &res_head_buffer, &res_body_buffer);
-
-            // check session token
-            var logged_in: ?Login = null;
-
-            if (req.get_cookie("session_token")) |session_token_str| {
-                const session_token = try std.fmt.parseUnsigned(SessionToken, session_token_str, 16);
-                // const session_token = try std.fmt.parseUnsigned(SessionToken, session_token_str, 10);
-                // const session_token = std.mem.bytesToValue(SessionToken, session_token_str);
-                if (Chirp.get_session_user_id(env, session_token)) |user_id| {
-                    const txn = try env.txn();
-                    defer txn.abort();
-                    const users = try Db.users(txn);
-
-                    logged_in = .{
-                        .user = try users.get(user_id),
-                        .user_id = user_id,
-                        .session_token = session_token,
-                    };
-                } else |err| {
-                    std.debug.print("get_session_user err: {}\n", .{err});
-
-                    try res.add_header(
-                        "Set-Cookie",
-                        .{"session_token=deleted; Expires=Thu, 01 Jan 1970 00:00:00 GMT"},
-                    );
-                }
-            }
-
-            // html
-            if (req.method == .GET) {
-                try write_header(&res, logged_in);
-
-                if (std.mem.eql(u8, req.target, "/register")) {
-                    try res.write(
-                        \\<form action="/register" method="post">
-                        \\<input type="text" name="username" />
-                        \\<input type="password" name="password" />
-                        \\<input type="submit" value="Register" />
-                        \\</form>
-                    , .{});
-                    try res.send();
-                } else if (std.mem.eql(u8, req.target, "/login")) {
-                    try res.write(
-                        \\<form action="/login" method="post">
-                        \\<input type="text" name="username" />
-                        \\<input type="password" name="password" />
-                        \\<input type="submit" value="Login" />
-                        \\</form>
-                    , .{});
-                    try res.send();
-                } else if (std.mem.startsWith(u8, req.target, "/user/")) {
-                    const username = req.target[6..req.target.len];
-
-                    const txn = try env.txn();
-                    defer txn.abort();
-
-                    const user_ids = try Db.user_ids(txn);
-                    if (user_ids.get(try Username.fromSlice(username))) |user_id| {
-                        const users = try Db.users(txn);
-                        const user = try users.get(user_id);
-                        try write_posts(&res, txn, user, logged_in);
-                    } else |err| {
-                        try res.write(
-                            \\<p>User not found [{}]</p>
-                        , .{err});
-                    }
-                    try res.send();
-                } else {
-                    if (logged_in) |login| {
-                        const user = try Chirp.get_user(env, login.user_id);
-
-                        const txn = try env.txn();
-                        defer txn.abort();
-
-                        try write_posts(&res, txn, user, logged_in);
-
-                        try res.send();
-                    } else {
-                        try res.write("[GET] {s}", .{req.target});
-                        try res.send();
-                    }
-                }
-            }
-            // api
-            else {
-                if (std.mem.eql(u8, req.target, "/register")) {
-                    // TODO: handle args not supplied
-                    const username = req.get_value("username").?;
-                    const password = req.get_value("password").?;
-
-                    std.debug.print("New user: {s} {s}\n", .{ username, password });
-                    if (try Chirp.register_user(env, username, password)) {
-                        try res.redirect("/login");
-                    } else {
-                        try res.redirect("/register");
-                    }
-                    try res.send();
-                } else if (std.mem.eql(u8, req.target, "/login")) {
-                    // TODO: handle args not supplied
-                    const username = req.get_value("username").?;
-                    const password = req.get_value("password").?;
-
-                    std.debug.print("New login: {s} {s}\n", .{ username, password });
-                    if (Chirp.login_user(env, username, password)) |session_token| {
-                        res.status = .see_other;
-                        try res.add_header(
-                            "Location",
-                            .{ "/user/{s}", .{username} },
-                        );
-                        try res.add_header(
-                            "Set-Cookie",
-                            .{ "session_token={x}; Secure; HttpOnly", .{session_token} },
-                        );
-
-                        try res.send();
-                    } else |err| {
-                        std.debug.print("login_user err: {}\n", .{err});
-                        try res.redirect("/login");
-                        try res.send();
-                    }
-                } else if (std.mem.eql(u8, req.target, "/logout")) {
-                    if (logged_in) |login| {
-                        try Chirp.logout_user(env, login.session_token);
-
-                        try res.add_header(
-                            "Set-Cookie",
-                            .{"session_token=deleted; Expires=Thu, 01 Jan 1970 00:00:00 GMT"},
-                        );
-
-                        try res.redirect("/");
-                        try res.send();
-                    }
-                } else if (std.mem.eql(u8, req.target, "/post")) {
-                    if (logged_in) |login| {
-                        const text = req.get_value("text").?;
-                        try Chirp.post(env, login.user_id, text);
-
-                        try res.redirect("/");
-                        try res.send();
-                    }
-                } else if (std.mem.eql(u8, req.target, "/quit")) {
-                    try res.redirect("/");
-                    try res.send();
-                    break :accept;
-                } else if (std.mem.startsWith(u8, req.target, "/upvote/")) {
-                    const login = logged_in orelse return error.NotLoggedIn;
-
-                    const post_id_str = req.target[8..req.target.len];
-                    const post_id: PostId = @enumFromInt(try std.fmt.parseUnsigned(u64, post_id_str, 10));
-
-                    try Chirp.vote(env, post_id, login.user_id, .Up);
-
-                    if (req.get_header("Referer")) |ref| {
-                        try res.redirect(ref);
-                    }
-                    try res.send();
-                } else if (std.mem.startsWith(u8, req.target, "/downvote/")) {
-                    const login = logged_in orelse return error.NotLoggedIn;
-
-                    const post_id_str = req.target[10..req.target.len];
-                    const post_id: PostId = @enumFromInt(try std.fmt.parseUnsigned(u64, post_id_str, 10));
+fn handle_error(env: lmdb.Env, req: http.Request) !void {
+    _ = env;
+    var res = http.Response.init(req.fd, &res_head_buffer, &res_body_buffer);
+    try write_start(&res);
+    try res.write("Oops, something went terribly wrong there D:", .{});
+    try write_end(&res);
+    try res.send();
+}
+fn handle_request(env: lmdb.Env, req: http.Request) !void {
+    // std.debug.print("[{}]: {s}\n", .{ req.method, req.target });
+    // std.debug.print("[{}]: {s}\n", .{ req.method, req.head.? });
 
-                    try Chirp.vote(env, post_id, login.user_id, .Down);
+    // reponse
+    var res = http.Response.init(req.fd, &res_head_buffer, &res_body_buffer);
 
-                    if (req.get_header("Referer")) |ref| {
-                        try res.redirect(ref);
-                    }
-                    try res.send();
-                } else if (std.mem.startsWith(u8, req.target, "/unupvote/")) {
-                    // TODO: maybe move to one /unvote?
-                    const login = logged_in orelse return error.NotLoggedIn;
+    // check session token
+    const logged_in: ?Login = try check_login(env, req, &res);
 
-                    const post_id_str = req.target[10..req.target.len];
-                    const post_id: PostId = @enumFromInt(try std.fmt.parseUnsigned(u64, post_id_str, 10));
+    // html
+    if (req.method == .GET) {
+        try write_start(&res);
+        try write_header(&res, logged_in);
 
-                    try Chirp.unvote(env, post_id, login.user_id);
-
-                    if (req.get_header("Referer")) |ref| {
-                        try res.redirect(ref);
-                    }
-                    try res.send();
-                } else if (std.mem.startsWith(u8, req.target, "/undownvote/")) {
-                    const login = logged_in orelse return error.NotLoggedIn;
+        const txn = try env.txn();
+        defer txn.abort();
 
-                    const post_id_str = req.target[12..req.target.len];
-                    const post_id: PostId = @enumFromInt(try std.fmt.parseUnsigned(u64, post_id_str, 10));
+        const get = GET{
+            .txn = txn,
+            .req = req,
+            .res = &res,
+            .logged_in = logged_in,
+        };
+        if (try get.handle()) {} else {
+            try res.redirect("/");
+        }
 
-                    try Chirp.unvote(env, post_id, login.user_id);
+        try write_end(&res);
+        try res.send();
+    }
+    // api
+    else {
+        const post = POST{
+            .env = env,
+            .req = req,
+            .res = &res,
+            .logged_in = logged_in,
+        };
+        if (try post.handle()) {} else {
+            try res.write("<p>[POST] {s}</p>", .{req.target});
+        }
 
-                    if (req.get_header("Referer")) |ref| {
-                        try res.redirect(ref);
-                    }
-                    try res.send();
-                } else {
-                    // try req.respond(
-                    //     \\<p>POST</p>
-                    // , .{});
-                    try res.write("<p>[POST] {s}</p>", .{req.target});
-                    try res.send();
-                }
+        if (!res.has_header("Location")) {
+            if (req.get_header("Referer")) |ref| {
+                try res.redirect(ref);
+            } else {
+                try res.redirect("/");
             }
         }
+        try res.send();
     }
 }