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  • env.params.files is now an Array(FileUpload). You can iterate over to access the images.
env.params.files.each do |file|

  filename = file.filename

  if !filename.is_a?(String)
    "No filename included in upload"
  else
    file_path = ::File.join [Kemal.config.public_folder, "uploads/", filename]
    File.open(file_path, "w") do |f|
    IO.copy(file.tmpfile, f)
  end
  "Upload OK"
end

0.23.0 (17-06-2018)

  • Crystal 0.25.0 support 🎉
  • Add Kemal::Context.get? to safely access context storage 😎
  • [Security] Don't serve 404 image dynamically 👍
  • Disable X-Powered-By header #449. Thanks @Blacksmoke16 🙏

0.22.0 (29-12-2017)

  • Crystal 0.24.1 support 🎉
  • Only return string from route.#408 thanks @crisward 🙏
  • Don't crash on empty path when compiled in --release. #407 thanks @crisward 🙏
  • Rename Kemal::CommonLogHandler to Kemal::LogHandler and Kemal::CommonExceptionHandler to Kemal::ExceptionHandler.
  • Allow videos to be opened with correct mime type. #406 thanks @crisward 🙏
  • Add webm mime type.#413 thanks @reindeer-cafe 🙏

0.21.0 (05-09-2017)

  • Dynamically insert handlers 💪 Fixes #376.
  • Add context to WebSocket. This allows one to use HTTP::Server::Context in ws declarations 😍 Fixes #349.
ws "/:room_name" do |socket, env|
  env.params.url["room_name"]
end
  • Add support for customizing the headers of built-in Kemal::StaticFileHandler 🔨 Useful for supporting CORS for single page applications 👏
static_headers do |response, filepath, filestat|
  if filepath =~ /\.html$/
      response.headers.add("Access-Control-Allow-Origin", "*")
    end
    response.headers.add("Content-Size", filestat.size.to_s)
  end
end

  • Allow %w in Handler macros #385. Thanks @will 🙏

  • Security: X-Content-Type-Options: nosniff for static files. Fixes #379. Thanks @crisward 🙏

  • Performance: Remove tempfile management to OS. This brings %10 - 15 performance boost to Kemal 🚀

0.20.0 (01-07-2017)

  • Crystal 0.23.0 support! As always, Kemal is compatible with the latest major release of Crystal 💎
  • Great news everyone 🎉 All handlers are now completely customizable!. Use the default Kemal handlers or go wild, it's all up to you ⛏
# Don't forget to add `Kemal::RouteHandler::INSTANCE` or your routes won't work!
Kemal.config.handlers = [Kemal::InitHandler.new, YourHandler.new, Kemal::RouteHandler::INSTANCE]

You can also insert a handler into a specific position.

# This adds MyCustomHandler instance to 1 position. Be aware that the index starts from 0.
add_handler MyCustomHandler.new, 1
  • Updated Kilt to v0.4.0.
  • Make Route a Struct. This improves the performance of route declarations.

0.19.0 (09-05-2017)

  • Return no body for head route fixes #323. (thanks @crisward)
  • Update radix to 0.3.8. (thanks @waghanza)
  • User defined context store types. (thanks @neovitange)
class User
   property name
end

add_context_storage_type(User)
  • Prevent `send_file returning filesize. (thanks @crisward)
  • Dont call setup in config#add_filter_handler fixes #338.

0.18.3 (07-03-2017)

  • Remove Gzip::Header monkey patch since it's fixed in Crystal 0.21.1.

0.18.2 (24-02-2017)

0.18.1 (21-02-2017)

  • Crystal 0.21.0 support
  • Drop multipart.cr dependency. multipart support is now built-into Crystal <3
  • Since Crystal 0.21.0 comes built-in with multipart there are some improvements and deprecations.

meta has been removed from FileUpload and it has the following properties

  • tmpfile: This is temporary file for file upload. Useful for saving the upload file.
  • filename: File name of the file upload. (logo.png, images.zip e.g)
  • headers: Headers for the file upload.
  • creation_time: Creation time of the file upload.
  • modification_time: Last Modification time of the file upload.
  • read_time: Read time of the file upload.
  • size: Size of the file upload.

0.18.0 (11-02-2017)

  • Simpler file upload. File uploads can now be access from HTTP::Server::Context like env.params.files["filename"].

env.params.files["filename"] has 5 methods

  • tmpfile: This is temporary file for file upload. Useful for saving the upload file.
  • tmpfile_path: File path of tmpfile.
  • filename: File name of the file upload. (logo.png, images.zip e.g)
  • meta: Meta information for the file upload.
  • headers: Headers for the file upload.

Here's a fully working sample for reading a image file upload image1 and saving it under public/uploads.

post "/upload" do |env|
file = env.params.files["image1"].tmpfile
file_path = ::File.join [Kemal.config.public_folder, "uploads/", file.filename]
File.open(file_path, "w") do |f|
  IO.copy(file, f)
end
"Upload ok"
end

To test

curl -F "image1=@/Users/serdar/Downloads/kemal.png" http://localhost:3000/upload

0.17.5 (09-01-2017)

  • Update multipart.cr to 0.1.2. Fixes #285 related to multipart.cr

0.17.4 (24-12-2016)

0.17.3 (03-12-2016)

0.17.2 (25-11-2016)

  • Use body.gets_to_end for parse_json. Fixes #260.
  • Update Radix to 0.3.5 and lock pessimistically. (thanks @luislavena)

0.17.1 (24-11-2016)

  • Treat HTTP::Request body as an IO. Fixes #257

0.17.0 (23-11-2016)

  • Reimplemented Request middleware / filter routing.

Now all requests will first go through the Middleware stack then Filters (before_*) and will finally reach the matching route.

Which is illustrated as,

Request -> Middleware -> Filter -> Route
  • Rename return_with as halt.
  • Route declaration must start with /. Fixes #242
  • Set default exception Content-Type to text/html. Fixes #202
  • Add only and exclude paths for Kemal::Handler. This change requires that all handlers must inherit from Kemal::Handler.

For example this handler will only work on / path. By default the HTTP method is GET.

class OnlyHandler < Kemal::Handler
  only ["/"]

  def call(env)
    return call_next(env) unless only_match?(env)
    puts "If the path is / i will be doing some processing here."
  end
end

The handlers using exclude will work on the paths that isn't specified. For example this handler will work on any routes other than /.

class ExcludeHandler < Kemal::Handler
  exclude ["/"]

  def call(env)
    return call_next(env) unless only_match?(env)
    puts "If the path is NOT / i will be doing some processing here."
  end
end
  • Close response on halt. (thanks @samueleaton).
  • Update Radix to v0.3.4.
  • error handler now also yields error. For example you can get the error mesasage like
  error 500 do |env, err|
    err.message
  end
  • Update multipart.cr to v0.1.1

0.16.1 (12-10-2016)

  • Improved Multipart support with more info on parsed files. parse_multipart(env) now yields an UploadFile object which has the following properties field,data,meta,`headers.
post "/upload" do |env|
  parse_multipart(env) do |f|
    image1 = f.data if f.field == "image1"
    image2 = f.data if f.field == "image2"
    puts f.meta
    puts f.headers
    "Upload complete"
  end
end

0.16.0

  • Multipart support <3 (thanks @RX14). Now you can handle file uploads.
post "/upload" do |env|
  parse_multipart(env) do |field, data|
    image1 = data if field == "image1"
    image2 = data if field == "image2"
    "Upload complete"
  end
end
  • Make session configurable. Now you can specify session name and expire time wit
Kemal.config.session["name"] = "your_app"
Kemal.config.session["expire_time"] = 48.hours
  • Session now supports more types. (String, Int32, Float64, Bool)
  • Add gzip helper to enable / disable gzip compression on responses.
  • Static file caching with etag and gzip (thanks @crisward)
  • Kemal.run now accepts port to listen.

0.15.1 (05-09-2016)

  • Don't forget to call_next on NullLogHandler

0.15.0 (03-09-2016)

  • Add context store
  • KEMAL_ENV respects to Kemal.config.env and needs to be explicitly set.
  • Kemal::InitHandler is introduced. Adds initial configuration, headers like X-Powered-By.
  • Add send_file to helpers.
  • Add mime types.
  • Fix parsing JSON params when "charset" is present in "Content-Type" header.
  • Use http-only cookie for session
  • Inject STDOUT by default in CommonLogHandler