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const std = @import("std");
const zws = @import("zws");
const pq = @import("pq.zig");
const mustache = @import("mustache");
const Params = zws.Params;
const Err = error{ Overflow, InvalidCharacter, StreamTooLong, ColumnNotFound } || pq.PqError || std.http.Server.Response.WaitError || std.http.Server.Response.DoError || std.http.Server.Response.ReadError || std.http.Server.Response.FinishError || zws.Path.ParseError;
const Ctx = struct {
db: pq.Db,
pub fn clone(self: @This()) Ctx {
return Ctx{
.db = self.db,
};
}
pub fn deinit(self: @This()) void {
_ = self;
}
};
var gpa = std.heap.GeneralPurposeAllocator(.{}){};
const Rtr = zws.Router(Ctx, Err);
const router = Rtr{
.handlers = &[_]Rtr.Handler{
.{
.method = .GET,
.pattern = "/api/comments",
.handle_fn = get_comments,
},
.{
.method = .POST,
.pattern = "/api/comments",
.handle_fn = post_comments,
},
.{
.method = .GET,
.pattern = "/api/form/*",
.handle_fn = get_form,
},
},
.notfound = notfound,
};
pub fn main() !void {
var db = try pq.Db.init("postgresql://comments@localhost/comments");
try db.exec(@embedFile("migrations/0_init.sql"));
try db.exec(@embedFile("migrations/1_capcha.sql"));
defer db.deinit();
const server = zws.Server(Ctx, Rtr){
.allocator = gpa.allocator(),
.address = std.net.Address{ .in = std.net.Ip4Address.init(.{ 127, 0, 0, 1 }, 8080) },
.context = Ctx{ .db = db },
.handler = router,
};
try server.serve();
}
fn notfound(res: *std.http.Server.Response, _: Ctx) Err!void {
const rr = @embedFile("templates/notfound.html");
try constresponse(res, rr, .not_found);
}
fn badrequest(res: *std.http.Server.Response, _: Ctx) Err!void {
const rr = @embedFile("templates/badrequest.html");
try constresponse(res, rr, .bad_request);
}
fn constresponse(res: *std.http.Server.Response, rr: []const u8, status: std.http.Status) Err!void {
res.status = status;
res.transfer_encoding = .{ .content_length = rr.len };
try res.headers.append("content-type", "text/html");
try res.do();
try res.writeAll(rr);
try res.finish();
}
fn get_comments(res: *std.http.Server.Response, ctx: Ctx, _: Params) Err!void {
_ = ctx;
// Run SQL
// Render comments template
//zws.parse
const rr = @embedFile("templates/comments.html");
res.transfer_encoding = .{ .content_length = rr.len };
try res.headers.append("content-type", "text/html");
try res.do();
try res.writeAll(rr);
try res.finish();
}
fn post_comments(res: *std.http.Server.Response, ctx: Ctx, _: Params) Err!void {
var body_aa = std.ArrayList(u8).init(res.allocator);
try res.reader().readAllArrayList(&body_aa, 1_000_000);
var body = try body_aa.toOwnedSlice();
var form = try zws.Form.parse(res.allocator, body);
const Form = struct {
url: []const u8,
capcha_id: []const u8,
author: []const u8,
comment: []const u8,
capcha_answer: []const u8,
};
const form_val = form.form_to_struct(Form) catch {
try badrequest(res, ctx);
return;
};
// Validate the capcha
{
var stmt = try ctx.db.prepare_statement(res.allocator, "select answer from capchas where id = $1");
defer stmt.deinit();
try stmt.bind(0, form_val.capcha_id);
if (!try stmt.step()) {
std.log.err("missing capcha_id {s}", .{form_val.capcha_id});
try badrequest(res, ctx);
return;
}
const ans = try stmt.read_column(0, []const u8);
if (!std.mem.eql(u8, ans, form_val.capcha_answer)) {
try constresponse(res, @embedFile("templates/capchainvalid.html"), std.http.Status.unauthorized);
return;
}
}
// Add the comment...
{
var stmt = try ctx.db.prepare_statement(res.allocator, "insert into comments(url,author,comment) values($1, $2, $3)");
defer stmt.deinit();
try stmt.bind(0, form_val.url);
try stmt.bind(1, form_val.author);
try stmt.bind(2, form_val.comment);
_ = try stmt.step();
}
// And redirect!
res.transfer_encoding = .none;
res.status = .found;
try res.headers.append("location", form_val.url);
try res.do();
try res.finish();
}
fn get_form(res: *std.http.Server.Response, ctx: Ctx, _: Params) Err!void {
var p = try zws.Path.parse(res.allocator, res.request.target);
defer p.deinit();
const url: []const u8 = try p.get_query_param("url") orelse {
try badrequest(res, ctx);
return;
};
var stmt = try ctx.db.prepare_statement(res.allocator, "select id, question from capchas order by random() limit 1");
defer stmt.deinit();
if (!try stmt.step()) {
std.log.err("no capcha!", .{});
try badrequest(res, ctx);
return;
}
const Capcha = struct {
id: []const u8,
question: []const u8,
};
const capcha = try stmt.read_struct(Capcha);
const rr = @embedFile("templates/form.html");
const tt = comptime mustache.parseComptime(rr, .{}, .{});
res.transfer_encoding = .chunked;
try res.headers.append("content-type", "text/html");
try res.do();
// For some reason, mustache.render won't work with anonymous struct
const data = struct {
capcha_id: []const u8,
capcha_question: []const u8,
url: []const u8,
};
try mustache.render(tt, data{
.capcha_id = capcha.id,
.capcha_question = capcha.question,
.url = url,
}, res.writer());
try res.finish();
}
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