138 lines
4.2 KiB
Zig
138 lines
4.2 KiB
Zig
const std = @import("std");
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const http = @import("apple_pie");
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const images_dir_path = "./images";
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pub fn main() anyerror!void {
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std.log.info("All your codebase are belong to us.", .{});
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var gpa = std.heap.GeneralPurposeAllocator(.{}){};
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defer _ = gpa.deinit();
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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 Part = struct {};
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const Multipart = struct {
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body: []const u8,
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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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pub fn init(body: []const u8, content_type: []const 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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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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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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return Self{ .body = body, .boundary = boundary_value };
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}
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pub fn next(self: *Self) !?Part {
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return null;
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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 multipart = try Multipart.init(request.body, content_type.?);
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while (try multipart.next()) |part| {
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std.log.info("part: {}", .{part});
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}
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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}.jpg",
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.{ images_dir_path, image_id },
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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(request.body);
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try response.writer().writeAll(image_path);
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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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