fs - simple file server

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Check-in [e81f9f06dd]

Overview
Comment:Use Crystal MIME library for determining content-type.
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SHA3-256: e81f9f06dd267da574dfea849ea11c2cba4e43cfe1a08b9e4b8e9111b0b74e7d
User & Date: marka on 2025-08-15 13:44:14.066
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Context
2025-08-15
20:27
Add README. Leaf check-in: 7282daa3d4 user: marka tags: trunk
13:44
Use Crystal MIME library for determining content-type. check-in: e81f9f06dd user: marka tags: trunk
07:04
Serve index.html files correctly. check-in: 87b77ab4de user: marka tags: trunk
Changes
Side-by-Side Diff Ignore Whitespace Patch
Modified src/fs.cr from [ff1867bb3f] to [9e83e4bd7a]. 
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# fs - Crystal implementation of a simple static file server

require "uri"
require "http"
require "option_parser"
require "yaml"
require "logger"
require "mime"

# Class for reading configuration information from fs.yml.

class Config
  # Required settings
  getter host : String # 127.0.0.1 for localhost, 0.0.0.0 for all hosts
  getter port : Int32
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class Server
  def initialize(config : Config)
    @config = config
    @root = config.root
    @server = uninitialized HTTP::Server
  end

  # This gets called if HTTP::StaticFileHandler can't find a file.
  # The most common case is a directory path, in which case
  # we look for index.html in that directory.
  def process_request(context : HTTP::Server::Context)
    request = context.request
    request_path = request.path
    method = request.method

    MyLog.debug "process_request: got path #{request_path}, method #{method}"

    path = File.join(@root, request_path)
    if Dir.exists?(path)
      path = File.join(path, "index.html")
    end
    if File.exists?(path)
      content_type = `file -b --mime-type #{path}`.strip
      content_type = MIME.from_filename(path)
      context.response.content_type = content_type
      MyLog.info "Serving #{path}, content type #{content_type}"
      File.open(path) { |file| IO.copy(file, context.response) }
    else
      MyLog.error "No such file #{path}"
      context.response.respond_with_status(404, "No such file #{request_path}")
    end
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