357 lines
13 KiB
Zig
357 lines
13 KiB
Zig
const std = @import("std");
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const http = @import("apple_pie");
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const hzzp = @import("hzzp");
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const mimetypes = @import("mimetypes");
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const fmt = std.fmt;
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const images_dir_path = "./images";
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var registry: mimetypes.Registry = undefined;
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pub fn main() anyerror!void {
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std.log.info("welcome to webscale", .{});
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var gpa = std.heap.GeneralPurposeAllocator(.{}){};
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defer _ = gpa.deinit();
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registry = mimetypes.Registry.init(std.heap.page_allocator);
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defer registry.deinit();
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try registry.load();
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// TODO: configurable addr via env var
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const bind_addr = try std.net.Address.parseIp("0.0.0.0", 8080);
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std.log.info("serving on {}", .{bind_addr});
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// TODO: configurable path via env var
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try std.fs.cwd().makePath(images_dir_path);
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try http.listenAndServe(
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&gpa.allocator,
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bind_addr,
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comptime http.router.router(&[_]http.router.Route{
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http.router.get("/", index),
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http.router.post("/api/upload", uploadFile),
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http.router.get("/i/:filename", fetchFile),
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}),
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);
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}
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fn index(response: *http.Response, request: http.Request) !void {
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try response.writer().writeAll("Hello Zig!");
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}
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fn generateImageId(buffer: []u8) []const u8 {
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var i: usize = 0;
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const seed = @truncate(u64, @bitCast(u128, std.time.nanoTimestamp()));
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var r = std.rand.DefaultPrng.init(seed);
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while (i < 16) : (i += 1) {
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// random ascii lowercase char
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var idx = @intCast(u8, r.random.uintLessThan(u5, 24));
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var letter = @as(u8, 97) + idx;
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buffer[i] = letter;
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}
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return buffer[0..i];
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}
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const StreamT = std.io.FixedBufferStream([]const u8);
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const ContentDisposition = struct {
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allocator: *std.mem.Allocator,
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name: []const u8,
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filename: []const u8,
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const Self = @This();
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pub fn deinit(self: *Self) void {
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self.allocator.free(self.name);
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self.allocator.free(self.filename);
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}
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pub fn format(self: Self, comptime f: []const u8, options: fmt.FormatOptions, writer: anytype) !void {
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if (f.len != 0) {
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@compileError("Unknown format character: '" ++ f ++ "'");
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}
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return fmt.format(
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writer,
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"Disposition{{.name='{s}', .filename='{s}'}}",
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.{ self.name, self.filename },
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);
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}
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};
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const Part = struct {
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allocator: *std.mem.Allocator,
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disposition: ContentDisposition,
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content_type: []const u8,
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body: []const u8,
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const Self = @This();
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pub fn deinit(self: *Self) void {
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self.disposition.deinit();
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self.allocator.free(self.content_type);
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}
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pub fn format(self: Self, comptime f: []const u8, options: fmt.FormatOptions, writer: anytype) !void {
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if (f.len != 0) {
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@compileError("Unknown format character: '" ++ f ++ "'");
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}
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return fmt.format(
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writer,
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"Part{{.content_type='{s}', .disposition={}, .body='{s}'}}",
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.{ self.content_type, self.disposition, self.body },
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);
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}
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};
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const Multipart = struct {
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stream: StreamT,
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boundary: []const u8,
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cursor: usize = 0,
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const Self = @This();
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// TODO: move boundary_buffer to allocator
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pub fn init(body: []const u8, content_type: []const u8, boundary_buffer: []u8) !Multipart {
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// parse content_type into what we want (the boundary)
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var it = std.mem.split(content_type, ";");
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const should_be_multipart = it.next() orelse return error.MissingContentType;
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std.log.debug("should be multipart: {s}", .{should_be_multipart});
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if (!std.mem.eql(u8, should_be_multipart, "multipart/form-data"))
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return error.InvalidContentType;
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const should_be_boundary = it.next() orelse return error.MissingBoundary;
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std.log.debug("should be boundary: {s} {d}", .{ should_be_boundary, should_be_boundary.len });
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if (!std.mem.startsWith(u8, should_be_boundary, " boundary="))
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return error.InvalidBoundary;
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var boundary_it = std.mem.split(should_be_boundary, "=");
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_ = boundary_it.next();
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const boundary_value = boundary_it.next() orelse return error.InvalidBoundary;
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std.log.debug("boundary value: {s} {d}", .{ boundary_value, boundary_value.len });
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const actual_boundary_value = try std.fmt.bufPrint(boundary_buffer, "--{s}", .{boundary_value});
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std.log.debug("actual boundary value: {s} {d}", .{ actual_boundary_value, actual_boundary_value.len });
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return Self{
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.stream = StreamT{ .buffer = body, .pos = 0 },
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.boundary = actual_boundary_value,
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};
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}
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pub fn next(self: *Self, hzzp_buffer: []u8, allocator: *std.mem.Allocator) !?Part {
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var reader = self.stream.reader();
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// first self.boundary.len+2 bytes MUST be boundary + \r + \n
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var boundary_buffer: [512]u8 = undefined;
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const maybe_boundary_raw = (try reader.readUntilDelimiterOrEof(&boundary_buffer, '\n')).?;
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const maybe_boundary_strip1 = std.mem.trimRight(u8, maybe_boundary_raw, "\n");
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const maybe_boundary_strip2 = std.mem.trimRight(u8, maybe_boundary_strip1, "\r");
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if (!std.mem.eql(u8, maybe_boundary_strip2, self.boundary)) {
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std.log.err("expected '{s}' {}, got '{s}' {}", .{ self.boundary, self.boundary.len, maybe_boundary_strip2, maybe_boundary_strip2.len });
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return error.InvalidBoundaryBody;
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}
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std.log.debug("got successful boundary {s}", .{maybe_boundary_strip2});
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// from there ownwards, its just http!
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var parser = hzzp.parser.request.create(hzzp_buffer, reader);
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// This is a hack so that it doesnt try to parse an http header.
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parser.state = .header;
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var content_disposition: ?ContentDisposition = null;
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var content_type: ?[]const u8 = null;
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std.log.debug("next bytes: {any}", .{self.stream.buffer[self.stream.pos..(self.stream.pos + 50)]});
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while (try parser.next()) |event| {
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std.log.debug("got event: {}", .{event});
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switch (event) {
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.status => unreachable,
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.end => break,
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.head_done => {},
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.header => |header| {
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// TODO lowercase header name
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if (std.mem.eql(u8, header.name, "Content-Disposition")) {
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// parse disposition
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var disposition_it = std.mem.split(header.value, ";");
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_ = disposition_it.next();
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var dispo_name: []const u8 = undefined;
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var dispo_filename: []const u8 = undefined;
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while (disposition_it.next()) |disposition_part_raw| {
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const disposition_part = std.mem.trim(u8, disposition_part_raw, " ");
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if (std.mem.eql(u8, disposition_part, "form-data")) continue;
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// we have an A=B thing
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var single_part_it = std.mem.split(disposition_part, "=");
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const inner_part_name = single_part_it.next().?;
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const inner_part_value_quoted = single_part_it.next().?;
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const inner_part_value = std.mem.trim(u8, inner_part_value_quoted, "\"");
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if (std.mem.eql(u8, inner_part_name, "name")) dispo_name = inner_part_value;
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if (std.mem.eql(u8, inner_part_name, "filename")) dispo_filename = inner_part_value;
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}
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content_disposition = ContentDisposition{
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.allocator = allocator,
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.name = try std.mem.dupe(allocator, u8, dispo_name),
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.filename = try std.mem.dupe(allocator, u8, dispo_filename),
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};
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std.log.debug("got content disposition for part! {}", .{content_disposition});
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} else if (std.mem.eql(u8, header.name, "Content-Type")) {
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content_type = try std.mem.dupe(allocator, u8, header.value);
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std.log.debug("got content type for part! {s}", .{content_type});
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}
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},
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else => {
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std.log.err("unexpected event: {}", .{event});
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@panic("shit");
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},
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}
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}
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// the rest of the reader until we find a matching boundary is the part body.
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// hzzp does not do it for us because it cant find a body encoding
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// (content-length, content-encoding)
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//
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// we can use the fact that we know the reader is FixedBufferStream
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// to extract the remaining body, then trim the boundary!
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//
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// THIS ASSUMES ONLY ONE FILE IS IN THE WIRE.
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const remaining_body = self.stream.buffer[self.stream.pos..self.stream.buffer.len];
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var end_boundary_buf: [512]u8 = undefined;
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const boundary_end_marker = try std.fmt.bufPrint(&end_boundary_buf, "{s}--\r\n", .{self.boundary});
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const actual_body = std.mem.trim(u8, remaining_body, boundary_end_marker);
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std.debug.warn("ctype out of this: '{s}'", .{content_type.?});
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return Part{
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.allocator = allocator,
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.disposition = content_disposition.?,
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.content_type = content_type.?,
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.body = actual_body,
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};
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}
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};
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fn uploadFile(response: *http.Response, request: http.Request) !void {
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std.log.info("upload! got {d} bytes", .{request.body.len});
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// find content-type header
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var it = request.iterator();
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var content_type: ?[]const u8 = null;
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while (it.next()) |header| {
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if (std.mem.eql(u8, header.key, "Content-Type")) {
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content_type = header.value;
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}
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}
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if (content_type == null) return error.InvalidContentType;
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// parse multipart data
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var boundary_buffer: [512]u8 = undefined;
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var multipart = try Multipart.init(request.body, content_type.?, &boundary_buffer);
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var hzzp_buffer: [1024]u8 = undefined;
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while (try multipart.next(&hzzp_buffer)) |part| {
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std.log.info(
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"got part from multipart request! name='{s}' filename='{s}' content_type='{s}' length={d}",
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.{ part.disposition.name, part.disposition.filename, part.content_type, part.body.len },
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);
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var extensions = registry.getExtensionsByType(part.content_type);
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if (extensions == null) return error.InvalidContentMimeType;
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const extension = extensions.?.items[0];
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var image_id_buffer: [256]u8 = undefined;
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const image_id = generateImageId(&image_id_buffer);
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var image_path_buffer: [512]u8 = undefined;
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const image_path = try std.fmt.bufPrint(
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&image_path_buffer,
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"{s}/{s}{s}",
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.{ images_dir_path, image_id, extension },
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);
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const image_file = try std.fs.cwd().createFile(image_path, .{});
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try image_file.writer().writeAll(part.body);
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try response.writer().writeAll(image_path);
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return;
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}
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}
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fn fetchFile(response: *http.Response, request: http.Request, filename: []const u8) !void {
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std.log.info("got name: {s}", .{filename});
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var image_path_buffer: [512]u8 = undefined;
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const images_dir = try std.fs.cwd().openDir(images_dir_path, .{});
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const image_path = try std.fmt.bufPrint(
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&image_path_buffer,
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"{s}/{s}",
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.{ images_dir_path, filename },
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);
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// TODO return 404 on error
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const image_file = try std.fs.cwd().openFile(image_path, .{ .read = false });
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while (true) {
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var file_write_buffer: [1024]u8 = undefined;
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const bytes_read = try image_file.read(&file_write_buffer);
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if (bytes_read == 0) return;
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try response.writer().writeAll(&file_write_buffer);
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}
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}
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pub const log_level: std.log.Level = .debug;
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test "multipart" {
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const body =
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"--1234\r\n" ++
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"Content-Type: text/plain\r\n" ++
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"Content-Disposition: form-data; name=file1; filename=ab.txt\r\n" ++
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"\r\n" ++
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"Hello!\n" ++
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"--1234\r\n" ++
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"Content-Type: application/json\r\n" ++
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// TODO: add 'content-type' support to content-disposition as well
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"Content-Disposition: form-data; name=file2; filename=data.json\r\n" ++
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"\r\n" ++
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"{\"status\": \"OK\"}\n" ++
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"--1234--\r\n";
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var buf: [512]u8 = undefined;
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var multipart = try Multipart.init(
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body,
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"multipart/form-data; boundary=1234",
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&buf,
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);
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var hzzp_buffer: [1024]u8 = undefined;
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var part1 = (try multipart.next(&hzzp_buffer, std.testing.allocator)).?;
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defer part1.deinit();
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std.debug.warn(
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"\npart={}\n",
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.{part1},
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);
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std.testing.expectEqualSlices(u8, "text/plain", part1.content_type);
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std.testing.expectEqualSlices(u8, "file1", part1.disposition.name);
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std.testing.expectEqualSlices(u8, "ab.txt", part1.disposition.filename);
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std.testing.expectEqualSlices(u8, "Hello!", part1.body);
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// var part2 = (try multipart.next(&hzzp_buffer)).?;
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}
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