Class: ApipieBindings::API

Inherits:
Object
  • Object
show all
Defined in:
lib/apipie_bindings/api.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(config, options = {}) ⇒ API

Creates new API bindings instance

Examples:

connect to a server

ApipieBindings::API.new({:uri => 'http://localhost:3000/',
  :username => 'admin', :password => 'changeme',
  :api_version => '2', :aggressive_cache_checking => true})

connect with a local API description

ApipieBindings::API.new({:apidoc_cache_dir => 'test/unit/data',
  :apidoc_cache_name => 'architecture'})

Options Hash (config):

  • :uri (String)

    base URL of the server

  • :username (String)

    username to access the API

  • :password (String)

    username to access the API

  • :oauth (Hash)

    options to access API using OAuth

    • :consumer_key (String) OAuth key

    • :consumer_secret (String) OAuth secret

    • :options (Hash) options passed to OAuth

  • :credentials (AbstractCredentials)

    object implementing ApipieBindings::AbstractCredentials interface e.g. HammerCLIForeman::BasicCredentials This is prefered way to pass credentials. Credentials acquired form :credentials object take precedence over explicite params

  • :headers (Hash)

    additional headers to send with the requests

  • :api_version (String) — default: '1'

    version of the API

  • :language (String)

    prefered locale for the API description

  • :apidoc_cache_base_dir (String) — default: '~/.cache/apipie_bindings'

    base directory for building apidoc_cache_dir

  • :apidoc_cache_dir (String) — default: apidoc_cache_base_dir+'/<URI>'

    where to cache the JSON description of the API

  • :apidoc_cache_name (String) — default: 'default'

    name of the cache file. If there is cache in the :apidoc_cache_dir, it is used.

  • :apidoc_authenticated (String) — default: true

    whether or not does the call to obtain API description use authentication. It is useful to avoid unnecessary prompts for credentials

  • :fake_responses (Hash) — default: {}

    responses to return if used in dry run mode

  • :dry_run (Bool) — default: false

    dry run mode allows to test your scripts and not touch the API. The results are taken form exemples in the API description or from the :fake_responses

  • :aggressive_cache_checking (Bool) — default: false

    check before every request if the local cache of API description (JSON) is up to date. By default it is checked after each API request

  • :logger (Object) — default: Logger.new(STDERR)

    custom logger class

  • :timeout (Number)

    API request timeout in seconds, use -1 to disable timeout

  • :follow_redirects (Symbol) — default: :default

    Possible values are :always, :never and :default. The :default is to only redirect in GET and HEAD requests (RestClient default)

  • :authenticator (AbstractAuthenticator)

    API request authenticator

Raises:


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# File 'lib/apipie_bindings/api.rb', line 58

def initialize(config, options={})
  if config[:uri].nil? && config[:apidoc_cache_dir].nil?
    raise ApipieBindings::ConfigurationError.new('Either :uri or :apidoc_cache_dir needs to be set')
  end
  @uri = config[:uri]
  @api_version = config[:api_version] || 1
  @language = config[:language]
  apidoc_cache_base_dir = config[:apidoc_cache_base_dir] || File.join(File.expand_path('~/.cache'), 'apipie_bindings')
  @apidoc_cache_dir = config[:apidoc_cache_dir] || File.join(apidoc_cache_base_dir, @uri.tr(':/', '_'), "v#{@api_version}")
  @apidoc_cache_name = config[:apidoc_cache_name] || set_default_name
  @apidoc_authenticated = (config[:apidoc_authenticated].nil? ? true : config[:apidoc_authenticated])
  @follow_redirects = config.fetch(:follow_redirects, :default)
  @dry_run = config[:dry_run] || false
  @aggressive_cache_checking = config[:aggressive_cache_checking] || false
  @fake_responses = config[:fake_responses] || {}
  @logger = config[:logger]
  unless @logger
    @logger = Logger.new(STDERR)
    @logger.level = Logger::ERROR
  end

  config = config.dup

  headers = {
    :content_type => 'application/json',
    :accept       => "application/json;version=#{@api_version}"
  }
  headers.merge!({ "Accept-Language" => language }) if language
  headers.merge!(config[:headers]) unless config[:headers].nil?
  headers.merge!(options.delete(:headers)) unless options[:headers].nil?

  log.debug "Global headers: #{inspect_data(headers)}"
  log.debug "Follow redirects: #{@follow_redirects.to_s}"

  if config[:authenticator]
    @authenticator = config[:authenticator]
  else
    @authenticator = legacy_authenticator(config)
  end

  if (config[:timeout] && config[:timeout].to_i < 0)
    config[:timeout] = (RestClient.version < '1.7.0') ? -1 : nil
  end

  # RestClient < 1.7.0 does not support ssl_ca_path use ssl_ca_file instead
  if options[:ssl_ca_path] && !RestClient::Request.method_defined?(:ssl_opts)
    parsed_uri = URI.parse(@uri)
    cert_file =  File.join(options[:ssl_ca_path], "#{parsed_uri.host}.pem")
    if File.exist?(cert_file)
      options[:ssl_ca_file] = cert_file
      log.warn "ssl_ca_path is not supported by RestClient. ssl_ca_file = #{cert_file} was used instead."
    end
  end

  @resource_config = {
    :timeout  => config[:timeout],
    :headers  => headers,
    :verify_ssl => true
  }.merge(options)

  @config = config
end

Instance Attribute Details

#apidoc_cache_nameObject (readonly)

Returns the value of attribute apidoc_cache_name


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# File 'lib/apipie_bindings/api.rb', line 9

def apidoc_cache_name
  @apidoc_cache_name
end

#dry_run=(value) ⇒ Object (writeonly)

Sets the attribute dry_run


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# File 'lib/apipie_bindings/api.rb', line 10

def dry_run=(value)
  @dry_run = value
end

#fake_responsesObject (readonly)

Returns the value of attribute fake_responses


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# File 'lib/apipie_bindings/api.rb', line 9

def fake_responses
  @fake_responses
end

#follow_redirectsObject (readonly)

Returns the value of attribute follow_redirects


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# File 'lib/apipie_bindings/api.rb', line 9

def follow_redirects
  @follow_redirects
end

#languageObject (readonly)

Returns the value of attribute language


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# File 'lib/apipie_bindings/api.rb', line 9

def language
  @language
end

#uriObject (readonly)

Returns the value of attribute uri


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# File 'lib/apipie_bindings/api.rb', line 9

def uri
  @uri
end

Instance Method Details

#apidocObject


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# File 'lib/apipie_bindings/api.rb', line 137

def apidoc
  @apidoc = @apidoc || load_apidoc || retrieve_apidoc
  @apidoc
end

#apidoc_cache_fileObject


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# File 'lib/apipie_bindings/api.rb', line 122

def apidoc_cache_file
   File.join(@apidoc_cache_dir, "#{@apidoc_cache_name}#{cache_extension}")
end

#call(resource_name, action_name, params = {}, headers = {}, options = {}) ⇒ Object

Call an action in the API. It finds most fitting route based on given parameters with other attributes necessary to do an API call. If in dry_run mode #initialize it finds fake response data in examples or user provided data. At the end when the response format is JSON it is parsed and returned as ruby objects. If server supports checksum sending the internal cache with API description is checked and updated if needed

Examples:

show user data

call(:users, :show, :id => 1)

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# File 'lib/apipie_bindings/api.rb', line 178

def call(resource_name, action_name, params={}, headers={}, options={})
  check_cache if @aggressive_cache_checking
  resource = resource(resource_name)
  action = resource.action(action_name)
  action.validate!(params) unless options[:skip_validation]
  options[:fake_response] = find_match(fake_responses, resource_name, action_name, params) || action.examples.first if dry_run?

  call_action(action, params, headers, options)
end

#call_action(action, params = {}, headers = {}, options = {}) ⇒ Object


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# File 'lib/apipie_bindings/api.rb', line 188

def call_action(action, params={}, headers={}, options={})
  route = action.find_route(params)
  return http_call(
    route.method,
    route.path(params),
    params.reject { |par, _| route.params_in_path.include? par.to_s },
    headers, options)
end

#check_cacheObject


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# File 'lib/apipie_bindings/api.rb', line 273

def check_cache
  begin
    response = http_call('get', "/apidoc/apipie_checksum", {}, { :accept => "application/json" })
    response['checksum']
  rescue
    nil
  end
end

#clean_cacheObject


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# File 'lib/apipie_bindings/api.rb', line 268

def clean_cache
  @apidoc = nil
  Dir["#{@apidoc_cache_dir}/*#{cache_extension}"].each { |f| File.delete(f) }
end

#clear_credentialsObject


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# File 'lib/apipie_bindings/api.rb', line 133

def clear_credentials
  @authenticator.clear if @authenticator && @authenticator.respond_to?(:clear)
end

#dry_run?Boolean


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# File 'lib/apipie_bindings/api.rb', line 142

def dry_run?
  @dry_run ? true : false
end

#has_resource?(name) ⇒ Boolean


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# File 'lib/apipie_bindings/api.rb', line 146

def has_resource?(name)
  apidoc[:docs][:resources].has_key? name
end

#http_call(http_method, path, params = {}, headers = {}, options = {}) ⇒ Object

Low level call to the API. Suitable for calling actions not covered by apipie documentation. For all other cases use #call

Examples:

show user data

http_call('get', '/api/users/1')

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# File 'lib/apipie_bindings/api.rb', line 209

def http_call(http_method, path, params={}, headers={}, options={})
  headers ||= { }

  args = [http_method]
  if %w[post put].include?(http_method.to_s)
    #If using multi-part forms, the paramaters should not be json
    if ((headers.include?(:content_type)) and (headers[:content_type] == "multipart/form-data"))
      args << params
    else
      args << params.to_json
    end
  else
    headers[:params] = params if params
  end

  log.info "Server: #{@uri}"
  log.info "#{http_method.to_s.upcase} #{path}"
  log.debug "Params: #{inspect_data(params)}"
  log.debug "Headers: #{inspect_data(headers)}"

  args << headers if headers

  if dry_run?
    empty_response = ApipieBindings::Example.new('', '', '', 200, '')
    ex = options[:fake_response ] || empty_response
    response = create_fake_response(ex.status, ex.response, http_method, URI.join(@uri || 'http://example.com', path).to_s, args)
  else
    apidoc_without_auth = (path =~ /\/apidoc\//) && !@apidoc_authenticated
    authenticate = options[:with_authentication].nil? ? !apidoc_without_auth : options[:with_authentication]
    begin
      client = authenticate ? authenticated_client : unauthenticated_client
      response = call_client(client, path, args)
      update_cache(response.headers[:apipie_checksum])
    rescue => e
      log.error e.message
      log.debug inspect_data(e)
      if e.respond_to?(:response) && e.response.respond_to?(:headers)
        update_cache(e.response.headers[:apipie_checksum])
      end
      override_e = @authenticator.error(e) if authenticate && @authenticator
      raise override_e.is_a?(StandardError) ? override_e : e
    end
  end

  result = options[:response] == :raw ? response : process_data(response)
  log.debug "Response: %s" % (options[:reduce_response_log] ? "Received OK" : inspect_data(result))
  log.debug "Response headers: #{inspect_data(response.headers)}" if response.respond_to?(:headers)
  result
end

#load_apidocObject


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# File 'lib/apipie_bindings/api.rb', line 126

def load_apidoc
  check_cache if @aggressive_cache_checking
  if File.exist?(apidoc_cache_file)
    JSON.parse(File.read(apidoc_cache_file), :symbolize_names => true)
  end
end

#logObject


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# File 'lib/apipie_bindings/api.rb', line 306

def log
  @logger
end

#resource(name) ⇒ Object


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# File 'lib/apipie_bindings/api.rb', line 150

def resource(name)
  ApipieBindings::Resource.new(name, self)
end

#resourcesArray<ApipieBindings::Resource>

List available resources


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# File 'lib/apipie_bindings/api.rb', line 156

def resources
  apidoc[:docs][:resources].keys.map { |res| resource(res) }
end

#retrieve_apidocObject


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# File 'lib/apipie_bindings/api.rb', line 282

def retrieve_apidoc
  FileUtils.mkdir_p(@apidoc_cache_dir) unless File.exists?(@apidoc_cache_dir)
  if language
    response = retrieve_apidoc_call("/apidoc/v#{@api_version}.#{language}.json", :safe => true)
    language_family = language.split('_').first
    if !response && language_family != language
      response = retrieve_apidoc_call("/apidoc/v#{@api_version}.#{language_family}.json", :safe => true)
    end
  end
  unless response
    begin
      response = retrieve_apidoc_call("/apidoc/v#{@api_version}.json")
    rescue Exception => e
      raise ApipieBindings::DocLoadingError.new(
        "Could not load data from #{@uri}: #{e.message}\n"\
        " - is your server down?\n"\
        " - was rake apipie:cache run when using apipie cache? (typical production settings)", e)
    end
  end
  File.open(apidoc_cache_file, "w") { |f| f.write(response.body) }
  log.debug "New apidoc loaded from the server"
  load_apidoc
end

#update_cache(cache_name) ⇒ Object


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# File 'lib/apipie_bindings/api.rb', line 260

def update_cache(cache_name)
  if !cache_name.nil? && (cache_name != @apidoc_cache_name)
    clean_cache
    log.debug "Cache expired. (#{@apidoc_cache_name} -> #{cache_name})"
    @apidoc_cache_name = cache_name
  end
end