Class: Aspera::Rest

Inherits:
Object
  • Object
show all
Defined in:
lib/aspera/rest.rb

Overview

a simple class to make HTTP calls, equivalent to rest-client rest call errors are raised as exception RestCallError and error are analyzed in RestErrorAnalyzer

Direct Known Subclasses

Api::Alee, Api::AoC, Api::Ats, Api::Httpgw, Api::Node

Constant Summary collapse

ENTITY_NOT_FOUND =

error message when entity not found (TODO: use specific exception)

'No such'
JSON_DECODE =

Content-Type that are JSON

['application/json', 'application/vnd.api+json', 'application/x-javascript'].freeze
@@global =

global settings also valid for any subclass

{ # rubocop:disable Style/ClassVars
  user_agent:              'Ruby',          # goes to HTTP request header: 'User-Agent'
  download_partial_suffix: '.http_partial', # suffix for partial download
  session_cb:              nil,             # a lambda which takes the Net::HTTP as arg, use this to change parameters
  progress_bar:            nil # progress bar object
}

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(base_url:, auth: nil, not_auth_codes: nil, redirect_max: 0, headers: nil) ⇒ Rest

Returns a new instance of Rest.

Parameters:

  • base_url (String) —

    base URL of REST API

  • auth (Hash) (defaults to: nil) —

    authentication parameters: :type (:none, :basic, :url, :oauth2) :username [:basic] :password [:basic] :url_query [:url] a hash :* [:oauth2] see OAuth::Factory class

  • not_auth_codes (Array) (defaults to: nil) —

    codes that trigger a refresh/regeneration of bearer token

  • redirect_max (int) (defaults to: 0) —

    max redirection allowed



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# File 'lib/aspera/rest.rb', line 180

def initialize(
  base_url:,
  auth: nil,
  not_auth_codes: nil,
  redirect_max: 0,
  headers: nil
)
  Aspera.assert_type(base_url, String)
  # base url with max one trailing slashes (note: string may be frozen)
  @base_url = base_url.gsub(%r{//+$}, '/')
  # default is no auth
  @auth_params = auth.nil? ? {type: :none} : auth
  Aspera.assert_type(@auth_params, Hash)
  Aspera.assert(@auth_params.key?(:type)){'no auth type defined'}
  @not_auth_codes = not_auth_codes.nil? ? ['401'] : not_auth_codes
  Aspera.assert_type(@not_auth_codes, Array)
  # persistent session
  @http_session = nil
  # OAuth object (created on demand)
  @oauth = nil
  @redirect_max = redirect_max
  @headers = headers.nil? ? {} : headers
  Aspera.assert_type(@headers, Hash)
  @headers['User-Agent'] ||= @@global[:user_agent]
end

Instance Attribute Details

#auth_params ⇒ Object (readonly)

Returns the value of attribute auth_params.



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# File 'lib/aspera/rest.rb', line 158

def auth_params
  @auth_params
end

#base_url ⇒ Object (readonly)

Returns the value of attribute base_url.



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# File 'lib/aspera/rest.rb', line 159

def base_url
  @base_url
end

Class Method Details

.array_params(values) ⇒ Object

used to build a parameter list prefixed with “[]”

Parameters:

  • values (Array) —

    list of values



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# File 'lib/aspera/rest.rb', line 51

def array_params(values)
  return [ARRAY_PARAMS].concat(values)
end

.array_params?(values) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/aspera/rest.rb', line 55

def array_params?(values)
  return values.first.eql?(ARRAY_PARAMS)
end

.basic_token(user, pass) ⇒ Object 



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# File 'lib/aspera/rest.rb', line 47

def basic_token(user, pass); return "Basic #{Base64.strict_encode64("#{user}:#{pass}")}"; end

.build_uri(url, query_hash = nil) ⇒ Object

build URI from URL and parameters and check it is http or https, encode array [] parameters



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# File 'lib/aspera/rest.rb', line 60

def build_uri(url, query_hash=nil)
  uri = URI.parse(url)
  Aspera.assert(%w[http https].include?(uri.scheme)){"REST endpoint shall be http/s not #{uri.scheme}"}
  return uri if query_hash.nil?
  Log.log.debug{Log.dump('query', query_hash)}
  Aspera.assert_type(query_hash, Hash)
  return uri if query_hash.empty?
  query = []
  query_hash.each do |k, v|
    case v
    when Array
      # support array for query parameter, there is no standard. Either p[]=1&p[]=2, or p=1&p=2
      suffix = array_params?(v) ? v.shift : ''
      v.each do |e|
        query.push(["#{k}#{suffix}", e])
      end
    else
      query.push([k, v])
    end
  end
  # [] is allowed in url parameters
  uri.query = URI.encode_www_form(query).gsub('%5B%5D=', '[]=')
  return uri
end

.decode_query(query) ⇒ Object 



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# File 'lib/aspera/rest.rb', line 85

def decode_query(query)
  URI.decode_www_form(query).each_with_object({}){|v, h|h[v.first] = v.last }
end

.io_http_session(http_session) ⇒ Object

get Net::HTTP underlying socket i/o little hack, handy because HTTP debug, proxy, etc… will be available used implement web sockets after ‘start_http_session`



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# File 'lib/aspera/rest.rb', line 107

def io_http_session(http_session)
  Aspera.assert_type(http_session, Net::HTTP)
  # Net::BufferedIO in net/protocol.rb
  result = http_session.instance_variable_get(:@socket)
  Aspera.assert(!result.nil?){"no socket for #{http_session}"}
  return result
end

.remote_certificate_chain(url, as_string: true) ⇒ String

Returns PEM certificates of remote server.

Returns:

  • (String) —

    PEM certificates of remote server



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# File 'lib/aspera/rest.rb', line 116

def remote_certificate_chain(url, as_string: true)
  result = []
  # initiate a session to retrieve remote certificate
  http_session = Rest.start_http_session(url)
  begin
    # retrieve underlying openssl socket
    result = Rest.io_http_session(http_session).io.peer_cert_chain
  rescue
    result = http_session.peer_cert
  ensure
    http_session.finish
  end
  result = result.map(&:to_pem).join("\n") if as_string
  return result
end

.set_parameters(**options) ⇒ Object

set global parameters



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# File 'lib/aspera/rest.rb', line 133

def set_parameters(**options)
  options.each do |key, value|
    Aspera.assert(@@global.key?(key)){"Unknown Rest option #{key}"}
    @@global[key] = value
  end
end

.start_http_session(base_url) ⇒ Net::HTTP

Start a HTTP/S session, also used for web sockets

Parameters:

  • base_url (String) —

    base url of HTTP/S session

Returns:

  • (Net::HTTP) —

    a started HTTP session



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# File 'lib/aspera/rest.rb', line 92

def start_http_session(base_url)
  uri = build_uri(base_url)
  # this honors http_proxy env var
  http_session = Net::HTTP.new(uri.host, uri.port)
  http_session.use_ssl = uri.scheme.eql?('https')
  # set http options in callback, such as timeout and cert. verification
  @@global[:session_cb]&.call(http_session)
  # manually start session for keep alive (if supported by server, else, session is closed every time)
  http_session.start
  return http_session
end

.user_agent ⇒ String

Returns HTTP agent name.

Returns:

  • (String) —

    HTTP agent name



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# File 'lib/aspera/rest.rb', line 141

def user_agent
  return @@global[:user_agent]
end

Instance Method Details

#call(operation:, subpath: nil, query: nil, body: nil, body_type: nil, save_to_file: nil, return_error: false, headers: nil) ⇒ Object

HTTP/S REST call

Parameters:

  • operation (String) —

    HTTP operation (GET, POST, PUT, DELETE)

  • subpath (String) (defaults to: nil) —

    subpath of REST API

  • query (Hash) (defaults to: nil) —

    URL parameters

  • body (Hash, String) (defaults to: nil) —

    body parameters

  • body_type (Symbol) (defaults to: nil) —

    type of body parameters (:json, :www, :text, nil)

  • save_to_file (filepath) (defaults to: nil)
  • return_error (bool) (defaults to: false)
  • headers (Hash) (defaults to: nil) —

    additional headers



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# File 'lib/aspera/rest.rb', line 226

def call(
  operation:,
  subpath: nil,
  query: nil,
  body: nil,
  body_type: nil,
  save_to_file: nil,
  return_error: false,
  headers: nil
)
  subpath = subpath.to_s if subpath.is_a?(Symbol)
  subpath = '' if subpath.nil?
  Aspera.assert_type(subpath, String)
  if headers.nil?
    headers = @headers.clone
  else
    h = headers
    headers = @headers.clone
    headers.merge!(h)
  end
  Aspera.assert_type(headers, Hash)
  Log.log.debug{"#{operation} [#{subpath}]".red.bold.bg_green}
  case @auth_params[:type]
  when :none
    # no auth
  when :basic
    Log.log.debug('using Basic auth')
    # done in build_req
  when :oauth2
    headers['Authorization'] = oauth.token unless headers.key?('Authorization')
  when :url
    query ||= {}
    @auth_params[:url_query].each do |key, value|
      query[key] = value
    end
  else Aspera.error_unexpected_value(@auth_params[:type])
  end
  result = {http: nil}
  # start a block to be able to retry the actual HTTP request in case of OAuth token expiration
  begin
    # TODO: shall we percent encode subpath (spaces) test with access key delete with space in id
    # URI.escape()
    separator = !['', '/'].include?(subpath) || @base_url.end_with?('/') ? '/' : ''
    uri = self.class.build_uri("#{@base_url}#{separator}#{subpath}", query)
    Log.log.debug{"URI=#{uri}"}
    begin
      # instantiate request object based on string name
      req = Net::HTTP.const_get(operation.capitalize).new(uri)
    rescue NameError
      raise "unsupported operation : #{operation}"
    end
    case body_type
    when :json
      req.body = JSON.generate(body) # , ascii_only: true
      req['Content-Type'] = 'application/json'
    when :www
      req.body = URI.encode_www_form(body)
      req['Content-Type'] = 'application/x-www-form-urlencoded'
    when :text
      req.body = body
      req['Content-Type'] = 'text/plain'
    when nil
    else
      raise "unsupported body type : #{body_type}"
    end
    # set headers
    headers.each do |key, value|
      req[key] = value
    end
    # :type = :basic
    req.basic_auth(@auth_params[:username], @auth_params[:password]) if @auth_params[:type].eql?(:basic)
    Log.log.debug{Log.dump(:req_body, req.body)}
    # we try the call, and will retry only if oauth, as we can, first with refresh, and then re-auth if refresh is bad
    oauth_tries ||= 2
    # initialize with number of initial retries allowed, nil gives zero
    tries_remain_redirect = @redirect_max.to_i if tries_remain_redirect.nil?
    Log.log.debug("send request (retries=#{tries_remain_redirect})")
    result_mime = nil
    file_saved = false
    # make http request (pipelined)
    http_session.request(req) do |response|
      result[:http] = response
      result_mime = (result[:http]['Content-Type'] || 'text/plain').split(';').first.downcase
      # JSON data needs to be parsed, in case it contains an error code
      if !save_to_file.nil? &&
          result[:http].code.to_s.start_with?('2') &&
          !result[:http]['Content-Length'].nil? &&
          !JSON_DECODE.include?(result_mime)
        total_size = result[:http]['Content-Length'].to_i
        Log.log.debug('before write file')
        target_file = save_to_file
        # override user's path to path in header
        if !response['Content-Disposition'].nil? && (m = response['Content-Disposition'].match(/filename="([^"]+)"/))
          target_file = File.join(File.dirname(target_file), m[1])
        end
        # download with temp filename
        target_file_tmp = "#{target_file}#{@@global[:download_partial_suffix]}"
        Log.log.debug{"saving to: #{target_file}"}
        written_size = 0
        @@global[:progress_bar]&.event(session_id: 1, type: :session_start)
        @@global[:progress_bar]&.event(session_id: 1, type: :session_size, info: total_size)
        File.open(target_file_tmp, 'wb') do |file|
          result[:http].read_body do |fragment|
            file.write(fragment)
            written_size += fragment.length
            @@global[:progress_bar]&.event(session_id: 1, type: :transfer, info: written_size)
          end
        end
        @@global[:progress_bar]&.event(session_id: 1, type: :end)
        # rename at the end
        File.rename(target_file_tmp, target_file)
        file_saved = true
      end
    end
    # sometimes there is a UTF8 char (e.g. (c) ), TODO : related to mime type encoding ?
    # result[:http].body.force_encoding('UTF-8') if result[:http].body.is_a?(String)
    # Log.log.debug{"result: body=#{result[:http].body}"}
    result[:data] = case result_mime
    when *JSON_DECODE
      JSON.parse(result[:http].body) rescue result[:http].body
    else # when 'text/plain'
      result[:http].body
    end
    Log.log.debug{"result: code=#{result[:http].code} mime=#{result_mime}"}
    Log.log.debug{Log.dump('data', result[:data])}
    RestErrorAnalyzer.instance.raise_on_error(req, result)
    File.write(save_to_file, result[:http].body) unless file_saved || save_to_file.nil?
  rescue RestCallError => e
    # not authorized: oauth token expired
    if @not_auth_codes.include?(result[:http].code.to_s) && @auth_params[:type].eql?(:oauth2)
      begin
        # try to use refresh token
        req['Authorization'] = oauth.token(refresh: true)
      rescue RestCallError => e_tok
        e = e_tok
        Log.log.error('refresh failed'.bg_red)
        # regenerate a brand new token
        req['Authorization'] = oauth.token(refresh: true)
      end
      Log.log.debug{"using new token=#{headers['Authorization']}"}
      retry if (oauth_tries -= 1).nonzero?
    end
    # redirect ? (any code beginning with 3)
    if e.response.is_a?(Net::HTTPRedirection) && tries_remain_redirect.positive?
      tries_remain_redirect -= 1
      current_uri = URI.parse(@base_url)
      new_url = e.response['location']
      # special case: relative redirect
      if URI.parse(new_url).host.nil?
        # we don't manage relative redirects with non-absolute path
        Aspera.assert(new_url.start_with?('/')){"redirect location is relative: #{new_url}, but does not start with /."}
        new_url = "#{current_uri.scheme}://#{current_uri.host}#{new_url}"
      end
      # forwards the request to the new location
      return self.class.new(base_url: new_url, redirect_max: tries_remain_redirect).call(
        operation: operation, query: query, body: body, body_type: body_type,
        save_to_file: save_to_file, return_error: return_error, headers: headers)
    end
    # raise exception if could not retry and not return error in result
    raise e unless return_error
  end
  Log.log.debug{"result=#{result}"}
  return result
end

#cancel(subpath) ⇒ Object 



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# File 'lib/aspera/rest.rb', line 411

def cancel(subpath)
  return call(operation: 'CANCEL', subpath: subpath, headers: {'Accept' => 'application/json'})
end

#create(subpath, params) ⇒ Object

CRUD methods here



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# File 'lib/aspera/rest.rb', line 395

def create(subpath, params)
  return call(operation: 'POST', subpath: subpath, headers: {'Accept' => 'application/json'}, body: params, body_type: :json)
end

#delete(subpath, params = nil) ⇒ Object 



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# File 'lib/aspera/rest.rb', line 407

def delete(subpath, params=nil)
  return call(operation: 'DELETE', subpath: subpath, headers: {'Accept' => 'application/json'}, query: params)
end

#lookup_by_name(subpath, search_name, query = {}) ⇒ Object

Query entity by general search (read with parameter ‘q`) TODO: not generic enough ? move somewhere ? inheritance ?

Parameters:

  • subpath —

    path of entity in API

  • search_name —

    name of searched entity

  • query (defaults to: {}) —

    additional search query parameters



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# File 'lib/aspera/rest.rb', line 421

def lookup_by_name(subpath, search_name, query={})
  # returns entities matching the query (it matches against several fields in case insensitive way)
  matching_items = read(subpath, query.merge({'q' => search_name}))[:data]
  # API style: {totalcount:, ...} cspell: disable-line
  matching_items = matching_items[subpath] if matching_items.is_a?(Hash)
  Aspera.assert_type(matching_items, Array)
  case matching_items.length
  when 1 then return matching_items.first
  when 0 then raise %Q{#{ENTITY_NOT_FOUND} #{subpath}: "#{search_name}"}
  else
    # multiple case insensitive partial matches, try case insensitive full match
    # (anyway AoC does not allow creation of 2 entities with same case insensitive name)
    name_matches = matching_items.select{|i|i['name'].casecmp?(search_name)}
    case name_matches.length
    when 1 then return name_matches.first
    when 0 then raise %Q(#{subpath}: multiple case insensitive partial match for: "#{search_name}": #{matching_items.map{|i|i['name']}} but no case insensitive full match. Please be more specific or give exact name.) # rubocop:disable Layout/LineLength
    else raise "Two entities cannot have the same case insensitive name: #{name_matches.map{|i|i['name']}}"
    end
  end
end

#oauth ⇒ Object

Returns the OAuth object (create, or cached if already created).

Returns:

  • the OAuth object (create, or cached if already created)



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# File 'lib/aspera/rest.rb', line 207

def oauth
  if @oauth.nil?
    Aspera.assert(@auth_params[:type].eql?(:oauth2)){'no OAuth defined'}
    oauth_parameters = @auth_params.reject { |k, _v| k.eql?(:type) }
    Log.log.debug{Log.dump('oauth parameters', oauth_parameters)}
    @oauth = OAuth::Factory.instance.create(**oauth_parameters)
  end
  return @oauth
end

#params ⇒ Object 



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# File 'lib/aspera/rest.rb', line 161

def params
  return {
    base_url:       @base_url,
    auth:           @auth_params,
    not_auth_codes: @not_auth_codes,
    redirect_max:   @redirect_max,
    headers:        @headers
  }
end

#read(subpath, query = nil) ⇒ Object 



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# File 'lib/aspera/rest.rb', line 399

def read(subpath, query=nil)
  return call(operation: 'GET', subpath: subpath, headers: {'Accept' => 'application/json'}, query: query)
end

#update(subpath, params) ⇒ Object 



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# File 'lib/aspera/rest.rb', line 403

def update(subpath, params)
  return call(operation: 'PUT', subpath: subpath, headers: {'Accept' => 'application/json'}, body: params, body_type: :json)
end