Class: Aspera::Rest

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

Overview

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

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(base_url:, auth: {type: :none}, not_auth_codes: ['401'], redirect_max: 0, headers: {}) ⇒ Rest

Create a REST object for API calls HTTP sessions parameters can be modified using global parameters in RestParameters For example, TLS verification can be skipped.

Parameters:

  • base_url (String) —

    base URL of REST API

  • auth (Hash) (defaults to: {type: :none}) —

    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: ['401']) —

    codes that trigger a refresh/regeneration of bearer token

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

    max redirection allowed

  • headers (Hash) (defaults to: {}) —

    default headers to include in all calls



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# File 'lib/aspera/rest.rb', line 306

def initialize(
  base_url:,
  auth: {type: :none},
  not_auth_codes: ['401'],
  redirect_max: 0,
  headers: {}
)
  Aspera.assert_type(base_url, String)
  # base url with no trailing slashes (note: string may be frozen)
  @base_url = base_url.chomp('/')
  # remove trailing port if it is 443 and scheme is https
  @base_url = @base_url.gsub(/:443$/, '') if @base_url.start_with?('https://')
  @base_url = @base_url.gsub(/:80$/, '') if @base_url.start_with?('http://')
  Log.log.debug{"Rest.new(#{@base_url})"}
  # default is no auth
  @auth_params = auth
  Aspera.assert_type(@auth_params, Hash)
  Aspera.assert(@auth_params.key?(:type), 'no auth type defined')
  @not_auth_codes = not_auth_codes
  Aspera.assert_type(@not_auth_codes, Array)
  # persistent session
  @http_session = nil
  @redirect_max = redirect_max
  Aspera.assert_type(@redirect_max, Integer)
  @headers = headers.clone
  Aspera.assert_type(@headers, Hash)
  @headers['User-Agent'] ||= RestParameters.instance.user_agent
  # OAuth object (created on demand)
  @oauth = nil
end

Instance Attribute Details

#auth_params ⇒ Object (readonly)

All original constructor parameters



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# File 'lib/aspera/rest.rb', line 274

def auth_params
  @auth_params
end

#base_url ⇒ Object (readonly)

The root URL for the API



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# File 'lib/aspera/rest.rb', line 277

def base_url
  @base_url
end

#headers ⇒ Object (readonly)

Base common headers of API



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# File 'lib/aspera/rest.rb', line 280

def headers
  @headers
end

Class Method Details

.basic_authorization(user, pass) ⇒ String

Returns Basic auth token.

Returns:

  • (String) —

    Basic auth token



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# File 'lib/aspera/rest.rb', line 81

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

.build_uri(url, query) ⇒ Object

Build URI from URL and parameters and check it is http or https. Check if php style is specified. nil values in query result in key without value, e.g. ?a, while empty string values result in ?a=.

Parameters:

  • url (String) —

    The URL without query.

  • query (Hash, Array, String) —

    The query.



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# File 'lib/aspera/rest.rb', line 97

def build_uri(url, query)
  uri = URI.parse(url)
  Aspera.assert_values(uri.scheme, %w[http https]){'URI scheme'}
  return uri if query.nil? || query.respond_to?(:empty?) && query.empty?
  Log.dump(:query, query)
  uri.query =
    case query
    when String
      query
    when Hash
      URI.encode_www_form(h_to_query_array(query))
    when Array
      Aspera.assert(query.all?{ |i| i.is_a?(Array) && i.length.eql?(2)}, 'Query must be array of arrays of 2 elements')
      URI.encode_www_form(query) # remove nil values
    else Aspera.error_unexpected_value(query.class){'query type'}
    end.gsub('%5B%5D=', '[]=')
  # [] is allowed in url parameters
  uri
end

.h_to_query_array(query) ⇒ Object

Support array for query parameter, there is no standard. Either p=1&p=2 (default) or p=1&p=2 (if :x_array_php_style is set to true in query)

Parameters:

  • query (Hash) —

    HTTP query as hash



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# File 'lib/aspera/rest.rb', line 121

def h_to_query_array(query)
  Aspera.assert_type(query, Hash)
  suffix = query.delete(:x_array_php_style) ? '[]' : nil
  query.each_with_object([]) do |(k, v), query_array|
    case v
    when Array
      v.each do |e|
        query_array.push(["#{k}#{suffix}", e])
      end
    else
      query_array.push([k, v])
    end
  end
end

.io_http_session(http_session) ⇒ Net::BufferedIO

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

Parameters:

  • http_session (Net::HTTP) —

    the session object

Returns:

  • (Net::BufferedIO) —

    The underlying socket i/o



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# File 'lib/aspera/rest.rb', line 210

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

.parse_header(header) ⇒ Hash

Parses an HTTP Content-Type header string into its media type and parameters according to RFC 9110 and RFC 6838. TODO: use gem: content_type

Parameters:

  • header (String) —

    The Content-Type header string, e.g., "application/json; charset=utf-8"

Returns:

  • (Hash) —

    A hash with :type and :parameters keys. Example:

    {
type: "application/json",
parameters: {
  charset: "utf-8",
  version: "1.0"
}
}


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# File 'lib/aspera/rest.rb', line 249

def parse_header(header)
  parts = header.split(';').map(&:strip)
  media_type = parts.shift.downcase
  parameters = parts.filter_map do |param|
    key, value = param.split('=', 2)
    next unless key && value
    key = key.strip.downcase.to_sym
    value = value.strip.gsub(/\A"|"\z/, '')
    [key, value]
  end.to_h
  {type: media_type, parameters: parameters}
end

.parse_link_header(link_header, rel: 'next') ⇒ String?

Parse Link header according to RFC 8288 to extract a specific relation

Parameters:

  • link_header (String, nil) —

    The Link header value

  • rel (String) (defaults to: 'next') —

    The relation to look for (default: 'next')

Returns:

  • (String, nil) —

    The URL of the link with the specified relation, or nil



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# File 'lib/aspera/rest.rb', line 162

def parse_link_header(link_header, rel: 'next')
  return if link_header.nil? || link_header.empty?
  # RFC 8288: Link header format is: <URI>; param1=value1; param2=value2, <URI2>; ...
  # We look for the link with the specified rel
  link_header.split(',').each do |link_part|
    link_part = link_part.strip
    # Extract URL between < and >
    url_match = link_part.match(/<([^>]+)>/)
    next unless url_match
    url = url_match[1]
    # Extract parameters after the URL
    params_str = link_part[url_match.end(0)..]
    # Check if this link has the specified rel (with or without quotes, case insensitive)
    next unless /;\s*rel\s*=\s*"?#{Regexp.escape(rel)}"?/i.match?(params_str)
    return url
  end
  # Fallback: if no rel found and looking for 'next', try the first link (backward compatibility)
  if rel.eql?('next')
    first_link = link_header.split(',').first&.strip
    if first_link
      url_match = first_link.match(/<([^>]+)>/)
      return url_match[1] if url_match
    end
  end
  nil
end

.php_style(query) ⇒ Hash

Indicate that the given Hash query uses php style for array parameters

Parameters:

  • query (Hash) —

    A key can have Array value and result will use PHP format: a=1&a=2

Returns:

  • (Hash) —

    The query parameters.



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# File 'lib/aspera/rest.rb', line 86

def php_style(query)
  Aspera.assert_type(query, Hash){'query'}
  query[:x_array_php_style] = true
  query
end

.query_to_h(query) ⇒ Hash

Decode query string as Hash if parameter is only once, then it's a scalar if a parameter is several, then it's array if parameter has [] then it's an array, and [] is removed Support arrays in query string, e.g. PHP's way is p=1&p=2

Parameters:

  • query (String) —

    query string as in URI.query

Returns:

  • (Hash) —

    decoded query



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# File 'lib/aspera/rest.rb', line 143

def query_to_h(query)
  URI.decode_www_form(query).each_with_object({}) do |(key, value), h|
    if key.end_with?('[]')
      key = key[..-3]
      h[key] = [] unless h.key?(key)
    end
    if h.key?(key)
      h[key] = [h[key]] if !h[key].is_a?(Array)
      h[key].push(value)
    else
      h[key] = value
    end
  end
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 219

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

.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 192

def start_http_session(base_url)
  uri = URI.parse(base_url)
  Aspera.assert_values(uri.scheme, %w[http https]){'URI scheme'}
  # 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
  RestParameters.instance.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

Instance Method Details

#call(operation:, subpath: nil, query: nil, content_type: nil, body: nil, headers: nil, save_to_file: nil, exception: true, ret: :data) ⇒ Array(Hash, Net::HTTPResponse), ...

HTTP/S REST call

Parameters:

  • operation (String) —

    HTTP operation (GET, POST, PUT, DELETE)

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

    subpath of REST API

  • query (Hash{String,Symbol => Object}) (defaults to: nil) —

    URL parameters

  • content_type (String, nil) (defaults to: nil) —

    Type of body parameters (one of MIME_*) and serialization, else use headers

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

    Body parameters

  • headers (Hash{String => String}) (defaults to: nil) —

    Additional headers (override Content-Type)

  • save_to_file (String, nil) (defaults to: nil) —

    File path to save response body

  • exception (Boolean) (defaults to: true) —

    Whether to raise an exception on HTTP error

  • ret (Symbol) (defaults to: :data) —

    One of :data, :resp, :both — controls return value

Returns:

  • (Array(Hash, Net::HTTPResponse)) —

    When ret is :both

  • (Net::HTTPResponse) —

    When ret is :resp

  • (Hash) —

    When ret is :data

Raises:



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# File 'lib/aspera/rest.rb', line 362

def call(
  operation:,
  subpath: nil,
  query: nil,
  content_type: nil,
  body: nil,
  headers: nil,
  save_to_file: nil,
  exception: true,
  ret: :data
)
  subpath = subpath.to_s if subpath.is_a?(Symbol)
  subpath = '' if subpath.nil?
  Log.log.debug{"call #{operation} [#{subpath}]".red.bold.bg_green}
  Log.dump(:body, body, level: :trace1)
  Log.dump(:query, query, level: :trace1)
  Log.dump(:headers, headers, level: :trace1)
  Aspera.assert_type(subpath, String)
  # We must have a way to check return code
  Aspera.assert(exception || !ret.eql?(:data), 'ret: :data requires exception handler')
  if headers.nil?
    headers = @headers.clone
  else
    h = headers
    headers = @headers.clone
    headers.merge!(h)
  end
  Aspera.assert_type(headers, Hash)
  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.authorization 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
  result_data = nil
  # initialize with number of initial retries allowed, nil gives zero
  tries_remain_redirect = @redirect_max
  # start a block to be able to retry the actual HTTP request in case of OAuth token expiration
  begin
    Log.log.debug("send request (retries=#{tries_remain_redirect})")
    # TODO: shall we percent encode subpath (spaces) test with access key delete with space in id
    # URI.escape()
    separator = ['', '/'].include?(subpath) ? '' : '/'
    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 content_type
    when nil # ignore
    when Mime::JSON
      req.body = JSON.generate(body) # , ascii_only: true
      req['Content-Type'] = Mime::JSON
    when Mime::WWW
      req.body = URI.encode_www_form(body)
      req['Content-Type'] = Mime::WWW
    when Mime::TEXT
      req.body = body
      req['Content-Type'] = Mime::TEXT
    else Aspera.error_unexpected_value(content_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.dump(:req_body, req.body, level: :trace1)
    # we try the call, and will retry on some error types
    error_tries ||= 1 + RestParameters.instance.retry_max
    result_mime = nil
    file_saved = false
    # make http request (pipelined)
    http_session.request(req) do |response|
      result_http = response
      result_mime = self.class.parse_header(result_http['Content-Type'] || Mime::TEXT)[:type]
      Log.log.debug{"response: code=#{result_http.code}, mime=#{result_mime}, content-type=#{response['Content-Type']}"}
      # 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') &&
          !Mime.json?(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?
          disposition = self.class.parse_header(response['Content-Disposition'])
          target_file = File.join(File.dirname(target_file), disposition[:parameters][:filename]) if disposition[:parameters].key?(:filename) && !disposition[:parameters][:filename].eql?('.')
        end
        # download with temp filename
        target_file_tmp = "#{target_file}#{RestParameters.instance.download_partial_suffix}"
        Log.log.debug{"saving to: #{target_file}"}
        written_size = 0
        session_id = SecureRandom.uuid.freeze
        RestParameters.instance.progress_bar&.event(:session_start, session_id: session_id)
        RestParameters.instance.progress_bar&.event(:session_size, session_id: session_id, info: total_size) if total_size
        FileUtils.mkdir_p(File.dirname(target_file_tmp))
        limiter = TimerLimiter.new(0.5)
        File.open(target_file_tmp, 'wb') do |file|
          result_http.read_body do |fragment|
            file.write(fragment)
            written_size += fragment.length
            RestParameters.instance.progress_bar&.event(:transfer, session_id: session_id, info: written_size) if limiter.trigger?
          end
        end
        RestParameters.instance.progress_bar&.event(:session_end, session_id: session_id)
        RestParameters.instance.progress_bar&.event(:end)
        # rename at the end
        File.rename(target_file_tmp, target_file)
        file_saved = true
      end
    end
    Log.log.debug{"result: code=#{result_http.code} mime=#{result_mime}"}
    # sometimes there is a UTF8 char (e.g. © )
    # 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 = result_http.body
    Log.dump(:result_data_raw, result_data, level: :trace1)
    # TODO: Remove next 2 lines when bug in async node api is fixed. (Aspera/core/issues/4490)
    node_api_bug = result_data&.index('}HTTP/1.1 400 Bad Request') if result_data.is_a?(String)
    result_data = result_data[0..node_api_bug] if node_api_bug
    result_data = JSON.parse(result_data) if Mime.json?(result_mime) && !result_data.nil? && !result_data.empty?
    Log.dump(:result_data, result_data)
    RestErrorAnalyzer.instance.raise_on_error(req, result_data, result_http)
    unless file_saved || save_to_file.nil?
      FileUtils.mkdir_p(File.dirname(save_to_file))
      File.write(save_to_file, result_http.body, binmode: true)
    end
  rescue RestCallError => e
    do_retry = false
    # AoC have some timeout , like Connect to platform.bss.asperasoft.com:443 ...
    do_retry ||= true if e.response.body.include?('failed: connect timed out') && RestParameters.instance.retry_on_timeout
    # AoC sometimes not available
    do_retry ||= true if RestParameters.instance.retry_on_unavailable && UNAVAILABLE_CODES.include?(result_http.code.to_s)
    # possibility to retry anything if it fails
    do_retry ||= true if RestParameters.instance.retry_on_error
    # 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.authorization(refresh: true)
      rescue RestCallError => e_tok
        e = e_tok
        Log.log.error('refresh failed'.bg_red)
        # regenerate a brand new token
        req['Authorization'] = oauth.authorization(cache: false)
      end
      Log.log.debug{"using new token=#{headers['Authorization']}"}
      do_retry ||= true
    end
    if do_retry && (error_tries -= 1).positive?
      sleep(RestParameters.instance.retry_sleep) unless RestParameters.instance.retry_sleep.eql?(0)
      retry
    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,
        subpath: new_url.end_with?('/') ? '/' : nil,
        query: query,
        body: body,
        content_type: content_type,
        save_to_file: save_to_file,
        exception: exception,
        headers: headers,
        ret: ret
      )
    end
    # raise exception if could not retry and not return error in result
    raise e if exception
  end
  Log.log.debug{"result=http:#{result_http}, data:#{result_data.class}"}
  return case ret
         when :data then result_data
         when :resp then result_http
         when :both then [result_data, result_http]
         else Aspera.error_unexpected_value(ret){'Type of result for REST'}
         end
end

#cancel(subpath, **kwargs) ⇒ Object

Cancel: CANCEL



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# File 'lib/aspera/rest.rb', line 605

def cancel(subpath, **kwargs)
  kwargs[:headers] ||= {}
  kwargs[:headers]['Accept'] = Mime::JSON unless kwargs[:headers].key?('Accept')
  return call(operation: 'CANCEL', subpath: subpath, **kwargs)
end

#create(subpath, params, **kwargs) ⇒ Object

Create: POST



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# File 'lib/aspera/rest.rb', line 575

def create(subpath, params, **kwargs)
  kwargs[:headers] ||= {}
  kwargs[:headers]['Accept'] = Mime::JSON unless kwargs[:headers].key?('Accept')
  kwargs[:content_type] = Mime::JSON unless kwargs.key?(:content_type)
  return call(operation: 'POST', subpath: subpath, body: params, **kwargs)
end

#delete(subpath, params = nil, **kwargs) ⇒ Object

Delete: DELETE



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# File 'lib/aspera/rest.rb', line 598

def delete(subpath, params = nil, **kwargs)
  kwargs[:headers] ||= {}
  kwargs[:headers]['Accept'] = Mime::JSON unless kwargs[:headers].key?('Accept')
  return call(operation: 'DELETE', subpath: subpath, query: params, **kwargs)
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 338

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.dump(:oauth_parameters, oauth_parameters)
    @oauth = OAuth::Factory.instance.create(**oauth_parameters)
  end
  return @oauth
end

#params ⇒ Object

Returns creation parameters.

Returns:

  • creation parameters



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# File 'lib/aspera/rest.rb', line 283

def params
  return {
    base_url:       @base_url,       # String
    auth:           @auth_params,    # Hash
    not_auth_codes: @not_auth_codes, # Array
    redirect_max:   @redirect_max,   # Integer
    headers:        @headers         # Hash
  }
end

#read(subpath, query = nil, **kwargs) ⇒ Object

Read: GET



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# File 'lib/aspera/rest.rb', line 583

def read(subpath, query = nil, **kwargs)
  kwargs[:headers] ||= {}
  kwargs[:headers]['Accept'] = Mime::JSON unless kwargs[:headers].key?('Accept')
  return call(operation: 'GET', subpath: subpath, query: query, **kwargs)
end

#update(subpath, params, **kwargs) ⇒ Object

Update: PUT



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# File 'lib/aspera/rest.rb', line 590

def update(subpath, params, **kwargs)
  kwargs[:headers] ||= {}
  kwargs[:headers]['Accept'] = Mime::JSON unless kwargs[:headers].key?('Accept')
  kwargs[:content_type] = Mime::JSON unless kwargs.key?(:content_type)
  return call(operation: 'PUT', subpath: subpath, body: params, **kwargs)
end