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是否有统一的方法来获取 Ruby 中 file:// 或 http:// URI 方案的内容？

发布于 2024-12-06 15:04:31 字数 113 浏览 0 评论 0原文

看来 Net::HTTP 库不支持通过 file:// 加载本地文件。我想根据环境配置从文件或远程加载内容。

是否有标准的 Ruby 方法可以以相同的方式访问任一类型，或者禁止一些简洁的分支代码？

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乜一 2024-12-13 15:04:31

你知道 open-uri 吗？

require 'open-uri'

open("/home/me/file.txt") { |f| ... }
open("http://www.google.com") { |f| ... }

因此，要在一个语句中支持“http://”或“file://”，只需从 uri 的开头删除“file://”（如果存在）（并且无需对“ http://")，像这样：

uri = ...
open(uri.sub(%r{^file://}, ''))

Do you know about open-uri?

require 'open-uri'

open("/home/me/file.txt") { |f| ... }
open("http://www.google.com") { |f| ... }

So to support either "http://" or "file://" in one statement, simply remove the "file://" from the beginning of the uri if it is present (and no need to do any processing for "http://"), like so:

uri = ...
open(uri.sub(%r{^file://}, ''))

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云裳 2024-12-13 15:04:31

下面是一些实验代码，教“open-uri”处理“file:”URI：

require 'open-uri'
require 'uri'

module URI

  class File < Generic
    def open(*args, &block)
      ::File.open(self.path, &block)
    end
  end

  @@schemes['FILE'] = File

end

Here's some experimental code that teaches "open-uri" to handle "file:" URIs:

require 'open-uri'
require 'uri'

module URI

  class File < Generic
    def open(*args, &block)
      ::File.open(self.path, &block)
    end
  end

  @@schemes['FILE'] = File

end

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痴情 2024-12-13 15:04:31

正如 Ben Lee 指出的那样， open-uri 就是这样去这里。我还将它与 paperclip 结合使用来存储与模型相关的资源，这使一切变得非常简单。

require 'open-uri'
class SomeModel < ActiveRecord::Base
  attr_accessor :remote_url

  has_attached_file :resource # etc, etc.

  before_validation :get_remote_resource, :if => :remote_url_provided?

  validates_presence_of :remote_url, :if => :remote_url_provided?,
                                     :message => 'is invalid or missing'

  def get_remote_resource
    self.resource = SomeModel.download_remote_resource(self.remote_url)
  end

  def self.download_remote_resource (uri)
    io = open(URI.parse(uri))
    def io.original_filename; base_uri.path.split('/').last; end
    io.original_filename.blank? ? nil : io
    rescue 
  end
end

# SomeModel.new(:remote_url => 'http://www.google.com/').save

As Ben Lee pointed out, open-uri is the way to go here. I've also used it in combination with paperclip for storing resources associated with models, which makes everything brilliantly simple.

require 'open-uri'
class SomeModel < ActiveRecord::Base
  attr_accessor :remote_url

  has_attached_file :resource # etc, etc.

  before_validation :get_remote_resource, :if => :remote_url_provided?

  validates_presence_of :remote_url, :if => :remote_url_provided?,
                                     :message => 'is invalid or missing'

  def get_remote_resource
    self.resource = SomeModel.download_remote_resource(self.remote_url)
  end

  def self.download_remote_resource (uri)
    io = open(URI.parse(uri))
    def io.original_filename; base_uri.path.split('/').last; end
    io.original_filename.blank? ? nil : io
    rescue 
  end
end

# SomeModel.new(:remote_url => 'http://www.google.com/').save

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