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const std = @import("std");
const mime = @import("mime/mime.zig");
const Address = std.net.Address;
const ArrayList = std.ArrayList;
const debug = std.debug;
const fmt = std.fmt;
const heap = std.heap;
const http = std.http;
const fs = std.fs;
const log = std.log.scoped(.server);
const mem = std.mem;
const bufferedReader = std.io.bufferedReader;
const getcwd = std.os.getcwd;
const server_addr = "127.0.0.1";
const server_port = 8080;
const MAX_PATH_BYTES = fs.MAX_PATH_BYTES;
const BUFFER_LIMIT = 1 << 21;
fn read_files(target: []const u8, buffer: []u8, allocator: mem.Allocator) !usize {
var file_path = try allocator.alloc(u8, MAX_PATH_BYTES);
defer allocator.free(file_path);
var cwd_buffer = [_]u8{0} ** MAX_PATH_BYTES;
const cwd = try getcwd(&cwd_buffer);
file_path = try fmt.allocPrint(allocator, "{s}{s}", .{ cwd, target });
log.info("Loading file {s}...", .{file_path});
// Determine if the requested file exists
const file = try fs.cwd().openFile(file_path, .{});
defer file.close();
var stat = try file.stat();
switch (stat.kind) {
.directory => {
if (mem.endsWith(u8, target, "/")) {
file_path = try fmt.allocPrint(allocator, "{s}index.html", .{target});
} else {
file_path = try fmt.allocPrint(allocator, "{s}/index.html", .{target});
}
return read_files(file_path, buffer, allocator);
},
.file => {
return try file.readAll(buffer);
},
else => {
return 0;
},
}
}
fn handle_request(response: *http.Server.Response, allocator: mem.Allocator) !void {
// Log the request details
log.info("{s} {s} {s}", .{ @tagName(response.request.method), @tagName(response.request.version), response.request.target });
// Create a []u8 to read up to BUFFER_LIMIT characters
var read = [_]u8{0} ** BUFFER_LIMIT;
// Set "connection" header to "keep-alive" if present in request headers
if (response.request.headers.contains("connection")) {
try response.headers.append("connection", "keep-alive");
}
const size = read_files(response.request.target, &read, allocator) catch |err| {
switch (err) {
error.AccessDenied => {
response.status = .forbidden;
},
error.FileNotFound => {
response.status = .not_found;
},
error.OutOfMemory => {
response.status = .uri_too_long;
},
else => {
return err;
},
}
response.transfer_encoding = .{ .content_length = 0 };
try response.do();
return;
};
if (size >= BUFFER_LIMIT) {
response.status = .payload_too_large;
response.transfer_encoding = .{ .content_length = 0 };
try response.do();
return;
} else if (size > 0) {
// Get the file extension, and set the content-type header if it exists
// (using mime.zig)
// To do this, we iterate through response.request.target in reverse
// looking for a '/' or a '.'
// a '/' indicates a directory, so there is no extension
// a '.' indicates a file extension
var i: usize = response.request.target.len;
var mime_type: ?mime.Type = undefined;
if (mem.endsWith(u8, response.request.target, "/")) {
log.warn("Dir requested, returning index.html!", .{});
try response.headers.append("content-type", "text/html");
} else {
while (i > 0) {
i -= 1;
switch (response.request.target[i]) {
'/' => {
i = 0;
break;
},
'.' => {
break;
},
else => {
continue;
},
}
}
if (i <= 0) {
log.warn("No extension detected!", .{});
if (mem.indexOf(u8, &read, "<html")) |_| {
try response.headers.append("content-type", "text/html");
} else {
try response.headers.append("content-type", "text/plain");
}
} else {
log.info("Extension {s} detected!", .{response.request.target[i..]});
mime_type = mime.extension_map.get(response.request.target[i..]);
if (mime_type) |mime_val| {
try response.headers.append("content-type", @tagName(mime_val));
} else {
try response.headers.append("content-type", "text/plain");
}
}
}
// Create a []u8 that is exactly the intended size and no larger
const body = read[0..size];
log.info("{}", .{body.len});
// Check if the request target contains "?chunked"
if (mem.indexOf(u8, response.request.target, "?chunked") != null) {
response.transfer_encoding = .chunked;
} else {
response.transfer_encoding = .{ .content_length = size };
}
// Transmit the response
try response.do();
if (response.request.method != .HEAD) {
try response.writeAll(body);
try response.finish();
}
} else {
// If the file was not found, return error 404
response.status = .not_found;
response.transfer_encoding = .{ .content_length = 0 };
try response.do();
}
}
fn run_server(server: *http.Server, allocator: mem.Allocator) !void {
outer: while (true) {
// Accept incoming connection
var response = try server.accept(.{
.allocator = allocator,
});
defer response.deinit();
while (response.reset() != .closing) {
// Handle errors during request processing
response.wait() catch |err| switch (err) {
error.HttpHeadersInvalid => continue :outer,
error.EndOfStream => continue,
else => return err,
};
// Process the request
handle_request(&response, allocator) catch |err| {
response.status = .internal_server_error;
response.transfer_encoding = .{ .content_length = 0 };
try response.do();
return err;
};
}
}
}
pub fn main() !void {
// Define allocator
var gpa = heap.GeneralPurposeAllocator(.{}){};
defer debug.assert(gpa.deinit() == .ok);
const allocator = gpa.allocator();
// Initialize the server
var server = http.Server.init(allocator, .{ .reuse_address = true });
defer server.deinit();
// Log the server address and port
log.info("Server is running at {s}:{d}", .{ server_addr, server_port });
// Parse the server address
const address = Address.parseIp(server_addr, server_port) catch unreachable;
try server.listen(address);
// Run the server
run_server(&server, allocator) catch |err| {
// Handle server errors
log.err("server error: {}\n", .{err});
if (@errorReturnTrace()) |trace| {
debug.dumpStackTrace(trace.*);
}
std.os.exit(1);
};
}
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