add impl for file fetch

.gitignore

@@ -1 +1,4 @@
 zig-cache/
+deps.zig
+images/
+.zigmod/

build.zig

@@ -1,4 +1,5 @@
 const std = @import("std");
+const deps = @import("./deps.zig");
 
 pub fn build(b: *std.build.Builder) void {
     // Standard target options allows the person running `zig build` to choose
@@ -14,6 +15,7 @@ pub fn build(b: *std.build.Builder) void {
     const exe = b.addExecutable("yet-another-pomf-clone", "src/main.zig");
     exe.setTarget(target);
     exe.setBuildMode(mode);
+    deps.addAllTo(exe);
     exe.install();
 
     const run_cmd = exe.run();

src/main.zig

@@ -1,5 +1,87 @@
 const std = @import("std");
+const http = @import("apple_pie");
+
+const images_dir_path = "./images";
 
 pub fn main() anyerror!void {
     std.log.info("All your codebase are belong to us.", .{});
+
+    var gpa = std.heap.GeneralPurposeAllocator(.{}){};
+    defer _ = gpa.deinit();
+
+    const bind_addr = try std.net.Address.parseIp("0.0.0.0", 8080);
+    std.log.info("serving on {}", .{bind_addr});
+
+    // TODO: configurable path via env var
+    try std.fs.cwd().makePath(images_dir_path);
+
+    try http.listenAndServe(
+        &gpa.allocator,
+        bind_addr,
+        comptime http.router.router(&[_]http.router.Route{
+            http.router.get("/", index),
+            http.router.post("/api/upload", uploadFile),
+            http.router.get("/i/:filename", fetchFile),
+        }),
+    );
+}
+
+fn index(response: *http.Response, request: http.Request) !void {
+    try response.writer().writeAll("Hello Zig!");
+}
+
+fn generateImageId(buffer: []u8) []const u8 {
+    var i: usize = 0;
+
+    const seed = @truncate(u64, @bitCast(u128, std.time.nanoTimestamp()));
+    var r = std.rand.DefaultPrng.init(seed);
+
+    while (i < 16) : (i += 1) {
+        // random ascii lowercase char
+        var idx = @intCast(u8, r.random.uintLessThan(u5, 24));
+        var letter = @as(u8, 97) + idx;
+        buffer[i] = letter;
+    }
+
+    return buffer[0..i];
+}
+
+fn uploadFile(response: *http.Response, request: http.Request) !void {
+    std.log.info("upload! got {d} bytes", .{request.body.len});
+
+    var image_id_buffer: [256]u8 = undefined;
+    const image_id = generateImageId(&image_id_buffer);
+
+    var image_path_buffer: [512]u8 = undefined;
+    const image_path = try std.fmt.bufPrint(
+        &image_path_buffer,
+        "{s}/{s}.jpg",
+        .{ images_dir_path, image_id },
+    );
+
+    const image_file = try std.fs.cwd().createFile(image_path, .{});
+    try image_file.writer().writeAll(request.body);
+
+    try response.writer().writeAll(image_path);
+}
+
+fn fetchFile(response: *http.Response, request: http.Request, filename: []const u8) !void {
+    std.log.info("got name: {s}", .{filename});
+    var image_path_buffer: [512]u8 = undefined;
+
+    const images_dir = try std.fs.cwd().openDir(images_dir_path, .{});
+    const image_path = try std.fmt.bufPrint(
+        &image_path_buffer,
+        "{s}/{s}",
+        .{ images_dir_path, filename },
+    );
+
+    // TODO return 404 on error
+    const image_file = try std.fs.cwd().openFile(image_path, .{ .read = false });
+    while (true) {
+        var file_write_buffer: [1024]u8 = undefined;
+        const bytes_read = try image_file.read(&file_write_buffer);
+        if (bytes_read == 0) return;
+        try response.writer().writeAll(&file_write_buffer);
+    }
 }

zig.mod

@@ -2,3 +2,7 @@ id: n5imv64i14btgrqm6qbzyhqs2xc2e7w3hxk1l9b9s5qmtfz0
 name: yet-another-pomf-clone
 main: src/main.zig
 dependencies:
+
+  - src: git https://github.com/Luukdegram/apple_pie
+    name: apple_pie
+    main: src/apple_pie.zig