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const std = @import("std");
const memora = @import("memora");
const Context = memora.Context;
const Storage = memora.Storage;
const config = @import("config");
const Access = @import("access.zig").Access;
const log = std.log.scoped(.handler_info);
const Self = @This();
const Handler = *const fn (*Context) anyerror![]const u8;
get: ?Handler,
head: ?Handler,
post: ?Handler,
put: ?Handler,
delete: ?Handler,
connect: ?Handler,
options: ?Handler,
trace: ?Handler,
patch: ?Handler,
access: Access,
inline fn handler_from_method(self: *const Self, method: std.http.Method) ?Handler {
return switch (method) {
.GET => self.get,
.HEAD => self.head,
.POST => self.post,
.PUT => self.put,
.DELETE => self.delete,
.CONNECT => self.connect,
.OPTIONS => self.options,
.TRACE => self.trace,
.PATCH => self.patch,
};
}
inline fn get_fingerprint(cookie: []const u8) []const u8 {
const start = std.mem.indexOf(u8, cookie, "fingerprint=") orelse return "";
const end = std.mem.indexOf(u8, cookie[start + 12..], " ") orelse return cookie[start + 12..];
return cookie[start..end + 1];
}
pub fn handle(
self: *const Self,
request: *std.http.Server.Request,
storage: *Storage,
allocator: std.mem.Allocator,
) !void {
const handler = self.handler_from_method(request.head.method) orelse return request.respond(
"{ \"error\": \"Bad Request\" }",
.{ .status = .bad_request }
);
const cookie = cookie: {
var iterator = request.iterateHeaders();
while (iterator.next()) |header| {
if (std.ascii.eqlIgnoreCase(header.name, "cookie")) {
break :cookie header.value;
}
}
break :cookie "";
};
var arena = std.heap.ArenaAllocator.init(allocator);
defer arena.deinit();
var context: Context = .{
.request = request,
.storage = storage,
.allocator = arena.allocator(),
.fingerprint = get_fingerprint(cookie),
};
if (!comptime config.disable_auth) {
const allowed = switch (self.access) {
.everyone => true,
.users => storage.sessions.get(storage, context.fingerprint) != null,
.admins => admin: {
if (storage.sessions.get(storage, context.fingerprint)) |session| {
break :admin session.info.is_admin;
}
break :admin false;
},
};
if (!allowed) {
return request.respond(
"{ \"error\": \"Forbidden\" }",
.{ .status = .forbidden }
);
}
}
const response = handler(&context) catch |err| {
const response, const status_code: std.http.Status = switch (err) {
error.BadRequest => .{ "{ \"error\": \"Bad Request\" }", .bad_request },
error.Unauthorized => .{ "{ \"error\": \"Unauthorized\" }", .unauthorized },
error.Forbidden => .{ "{ \"error\": \"Forbidden\" }", .forbidden },
error.NotFound => .{ "{ \"error\": \"Not Found\" }", .not_found },
else => blk: {
log.err("handler for '{s}' returned {}", .{request.head.target, err});
break :blk .{ "{ \"error\": \"Internal Server Error\" }", .internal_server_error };
},
};
return request.respond(response, .{ .status = status_code });
};
var headers: std.ArrayList(std.http.Header) = .empty;
defer headers.deinit(allocator);
try headers.append(allocator, .{
.name = "Content-Type",
.value = context.response.headers.content_type
});
if (context.response.headers.fingerprint) |auth_token| {
var value = std.Io.Writer.Allocating.init(arena.allocator());
try value.writer.print("fingerprint={s}; Secure; Path=/", .{auth_token});
try headers.append(allocator, .{
.name = "Set-Cookie",
.value = value.written(),
});
}
try request.respond(response, .{
.extra_headers = headers.items
});
}
fn HandlerWrapper(T: type, name: []const u8) type {
const info = @typeInfo(@TypeOf(@field(T, name)));
const return_type = info.@"fn".return_type orelse void;
const payload_type = @typeInfo(return_type).error_union.payload;
return struct {
pub fn call(ctx: *Context) anyerror![]const u8 {
const args = args: {
const tuple = std.meta.fields(std.meta.ArgsTuple(@TypeOf(@field(T, name))));
if (tuple.len == 1) {
break :args .{ ctx };
} else if (tuple.len == 2) {
const Body = tuple[1].@"type";
var writer = std.Io.Writer.Allocating.init(ctx.allocator);
const interface = &writer.writer;
var buffer: [1024]u8 = undefined;
const reader = try ctx.request.readerExpectContinue(&buffer);
try reader.streamExact64(interface, ctx.request.head.content_length orelse 0);
const body = std.json.parseFromSliceLeaky(
Body,
ctx.allocator,
writer.written(),
.{}
) catch return error.BadRequest;
break :args .{ ctx, body };
} else {
@compileError("invalid amount of arguments for request function");
}
};
if (payload_type == []const u8) {
return @call(.auto, @field(T, name), args);
} else if (payload_type == void) {
try @call(.auto, @field(T, name), args);
return "";
} else {
var writer = std.Io.Writer.Allocating.init(ctx.allocator);
var stringify = std.json.Stringify { .writer = &writer.writer };
try stringify.write(try @call(.auto, @field(T, name), args));
return writer.written();
}
}
};
}
pub fn from_type(T: type) @This() {
return Self {
.get = if (@hasDecl(T, "get")) HandlerWrapper(T, "get").call else null,
.head = if (@hasDecl(T, "head")) HandlerWrapper(T, "head").call else null,
.post = if (@hasDecl(T, "post")) HandlerWrapper(T, "post").call else null,
.put = if (@hasDecl(T, "put")) HandlerWrapper(T, "put").call else null,
.delete = if (@hasDecl(T, "delete")) HandlerWrapper(T, "delete").call else null,
.connect = if (@hasDecl(T, "connect")) HandlerWrapper(T, "connect").call else null,
.options = if (@hasDecl(T, "options")) HandlerWrapper(T, "options").call else null,
.trace = if (@hasDecl(T, "trace")) HandlerWrapper(T, "trace").call else null,
.patch = if (@hasDecl(T, "patch")) HandlerWrapper(T, "patch").call else null,
.access = T.access,
};
}
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