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Carrierwave download file

Classier solution for file uploads for Rails, Sinatra and other Ruby web frameworks This gem provides a simple and extremely flexible way to upload files from Ruby applications. It works well with Rack based web applications, such as Ruby on Rails. As of version 2.0, Carrier Wave requires Rails 5.0 or higher and Ruby 2.2or higher. Start off by generating an uploader: fortemporary storage. You can use different stores, including filesystemand cloud storage. Most of the time you are going to want to use Carrier Wave together with an ORM. It is quite simple to mount uploaders on columns in your model, so you cansimply assign files and get going: Make sure you are loading Carrier Wave after loading your ORM, otherwise you'llneed to require the relevant extension manually, e.g.: Now you can cache files by assigning them to the attribute, they willautomatically be stored when the record is saved.```rubyu = avatar = params[:file] # Assign a file like this, or File.open('somewhere') do |f| u.avatar = fendu.save! u.# =There are more extensions listed in the wiki Carrier Wave also has convenient support for multiple file upload fields. This could be an array column or a JSONcolumn for example. Your choice depends on what your database supports. Forexample, create a migration like this: Certain files might be dangerous if uploaded to the wrong location, such as PHPfiles or other script files. Carrier Wave allows you to specify a whitelist ofallowed extensions or content types. If you're mounting the uploader, uploading a file with the wrong extension willmake the record invalid instead. Otherwise, an error is raised.whitelist in your uploaders for this protection to be effective, and you MUST either disable Image Magick's default SVG delegate or use the RSVG delegate for SVG processing. A valid whitelist that will restrict your uploader to images only, and mitigate the CVE is: will not inspect the file headers, and thus still leaves your application open to the vulnerability. Another security issue you should care for is the file names (see Ruby On Rails Security Guide). By default, Carrier Wave provides only English letters, arabic numerals and some symbols aswhite-listed characters in the file name. If you want to support local scripts (Cyrillic letters, letters with diacritics and so on), youhave to override gem is a runtime dependency and the content type is set automatically. Often you'll want to add different versions of the same file. There is built in support for this*: You must have Imagemagick installed to do image resizing. Some documentation refers to RMagick instead of Mini Magick but Mini Magick is recommended. To install Imagemagick on OSX with homebrew type the following: which makes surethat the width and height specified are filled, only croppingif the aspect ratio requires it. The above uploader could be used like this:```rubyuploader = Avatar Uploader.newuploader.store! (my_file) # size: 1024x768# = variable points to the instance object the uploader is attached to. For performance reasons, it is often useful to create versions from existing onesinstead of using the original file. If your uploader generates several versionswhere the next is smaller than the last, it will take less time to generate froma smaller, already processed image.```rubyclass My Uploader version insteadof the original version, potentially resulting in faster processing. Often you'll notice that uploaded files disappear when a validation fails. Carrier Wave has a feature that makes it easy to remember the uploaded file evenin that case. Suppose your , then save the object.```erb@user.remove_avatar! @user.save```Your users may find it convenient to upload a file from a location on the Internetvia a URL. Carrier Wave makes this simple, just add the appropriate attribute to yourform and you're good to go: option, you'll need to handle thoseerrors yourself. In many cases, especially when working with images, it might be a good idea toprovide a default url, a fallback in case no file has been uploaded. You can dothis easily by overriding the method to recreate theversions from the base file. This uses a naive approach which will re-upload andprocess the specified version or all versions, if none is passed as an argument. When you are generating random unique filenames you have to call will throw an exception on records without an image. To avoid this, scope the records to those with images or check if an image exists within the block. If you're using Active Record, recreating versions for a user avatar might look like this: It's a good idea to test your uploaders in isolation. In order to speed up yourtests, it's recommended to switch off processing in your tests, and to use thefile storage. In Rails you could do that by adding an initializer with:setting from this initializer will be ignored. If you need to test your processing, you should test it in isolation, and enableprocessing only for those tests that need it. Carrier Wave comes with some RSpec matchers which you may find useful:```rubyrequire 'carrierwave/test/matchers'describe My Uploader do include Carrier Wave:: Test:: Matcherslet(:user) let(:uploader) before do My Uploader.enableto_file) endafter do My Uploader.enable_processing = false uploader.remove! endcontext 'the thumb version' do it "scales down a landscape image to be exactly 64 by 64 pixels" do expect(uploader.thumb)have_dimensions(64, 64) end endcontext 'the small version' do it "scales down a landscape image to fit within 200 by 200 pixels" do expect(uploader.small)belarger_than(200, 200) end endit "makes the image readable only to the owner and not executable" do expect(uploader)have_permissions(0600) endit "has the correct format" do expect(uploader)be_format('png') endend```If you're looking for minitest asserts, checkout carrierwave_asserts. Setting the enable_processing flag on an uploader will prevent any of the versions from processing as well. Processing can be enabled for a single version by setting the processing flag on the version like so:directory (also known as a bucket) in an initializer. For the sake of performance it is assumed that the directory already exists, so please create it if it needs to be. You can also pass in additional options, as documented fully in lib/carrierwave/storage/ Here's a full example:ruby Carrier Wave.configure do |config| config.fog_credentials = config.fog_directory = 'name_of_bucket' # required config.fog_public = false # optional, defaults to true config.fog_attributes = # optional, defaults to # For an application which utilizes multiple servers but does not need caches persisted across requests, # uncomment the line :file instead of the default :storage. Otherwise, it will use AWS as the temp cache store. # config.cache_storage = :fileend You'll need to configure a directory (also known as a container), username and API key in the initializer. For the sake of performance it is assumed that the directory already exists, so please create it if need be. Using a US-based account: You'll need to configure a directory (also known as a bucket) and the credentials in the initializer. For the sake of performance it is assumed that the directory already exists, so please create it if need be. Please read the fog-google README on how to get credentials. For Google Storage JSON API (recommended): A couple of notes about versions:* This functionality was introduced in Fog v1.20.* This functionality is slated for Carrier Wave v1.0.0. If you're not relying on Gemfile entries alone and are requiring "carrierwave" anywhere, ensure you require "fog/rackspace/storage" before it. Ex: If you're uploading images, you'll probably want to manipulate them in some way,you might want to create thumbnail images for example. Carrier Wave comes with asmall library to make manipulating images with RMagick easier, you'll need toinclude it in your Uploader: callback, which will call that method any time afile is uploaded. Convert will only work if the file has the same file extension, thus the use of the filename method.```rubyclass Avatar Uploader fill: [200, 200] process convert: 'png'def filename super.chomp(File.extname(super)) '.png' if original_filename.present? method, which makes it easy for you to write your ownmanipulation methods. Mini Magick is similar to RMagick but performs all the operations using the 'convert'CLI which is part of the standard Image Magick kit. This allows you to have the powerof Image Magick without having to worry about installing all the RMagick libraries. See the Mini Magick site for more details:https://github.com/minimagick/minimagick And the Image Magick command line options for more for whats on offer: the Mini Magick carrierwave processor provides exactly the same methods asfor the RMagick processor.```rubyclass Avatar Uploader yamlerrors: messages: carrierwave_processing_error: failed to be processed carrierwave_integrity_error: is not of an allowed file type carrierwave_download_error: could not be downloaded extension_whitelist_error: "You are not allowed to upload % files, allowed types: %" extension_blacklist_error: "You are not allowed to upload % files, prohibited types: %" content_type_whitelist_error: "You are not allowed to upload % files, allowed types: %" content_type_blacklist_error: "You are not allowed to upload % files" rmagick_processing_error: "Failed to manipulate with rmagick, maybe it is not an image? " mini_magick_processing_error: "Failed to manipulate with Mini Magick, maybe it is not an image? Original Error: %" min_size_error: "File size should be greater than %" max_size_error: "File size should be less than %"library adds support for additional locales. By default, Carrier Wave copies an uploaded file twice, first copying the file into the cache, thencopying the file into the store. For large files, this can be prohibitively time consuming. You may change this behavior by overriding either or both of the methods return true, files will be moved (instead of copied) to the cache and store respectively. This has only been tested with the local filesystem store. By default, mounting an uploader into an Active Record model will add a fewcallbacks. For example, this code:rubybefore_save :write_avatar_identifierafter_save :store_previous_changes_for_avatarafter_commit :remove_avatar! , on: :destroyafter_commit :mark_remove_avatar_false, on: :updateafter_commit :remove_previously_stored_avatar, on: :updateafter_commit :store_avatar! , on: [:create, :update]See Copyright (c) 2008-2015 Jonas Nicklas Permission is hereby granted, free of charge, to any person obtaininga copy of this software and associated documentation files (the"Software"), to deal in the Software without restriction, includingwithout limitation the rights to use, copy, modify, merge, publish,distribute, sublicense, and/or sell copies of the Software, and topermit persons to whom the Software is furnished to do so, subject tothe following conditions: The above copyright notice and this permission notice shall beincluded in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OFMERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE ANDNONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BELIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTIONOF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTIONWITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. Classier solution for file uploads for Rails, Sinatra and other Ruby web frameworks This gem provides a simple and extremely flexible way to upload files from Ruby applications. It works well with Rack based web applications, such as Ruby on Rails. As of version 2.0, Carrier Wave requires Rails 5.0 or higher and Ruby 2.2or higher. Start off by generating an uploader: fortemporary storage. You can use different stores, including filesystemand cloud storage. Most of the time you are going to want to use Carrier Wave together with an ORM. It is quite simple to mount uploaders on columns in your model, so you cansimply assign files and get going: Make sure you are loading Carrier Wave after loading your ORM, otherwise you'llneed to require the relevant extension manually, e.g.: Now you can cache files by assigning them to the attribute, they willautomatically be stored when the record is saved.```rubyu = avatar = params[:file] # Assign a file like this, or File.open('somewhere') do |f| u.avatar = fendu.save! u.# =There are more extensions listed in the wiki Carrier Wave also has convenient support for multiple file upload fields. This could be an array column or a JSONcolumn for example. Your choice depends on what your database supports. Forexample, create a migration like this: Certain files might be dangerous if uploaded to the wrong location, such as PHPfiles or other script files. Carrier Wave allows you to specify a whitelist ofallowed extensions or content types. If you're mounting the uploader, uploading a file with the wrong extension willmake the record invalid instead. Otherwise, an error is raised.whitelist in your uploaders for this protection to be effective, and you MUST either disable Image Magick's default SVG delegate or use the RSVG delegate for SVG processing. A valid whitelist that will restrict your uploader to images only, and mitigate the CVE is: will not inspect the file headers, and thus still leaves your application open to the vulnerability. Another security issue you should care for is the file names (see Ruby On Rails Security Guide). By default, Carrier Wave provides only English letters, arabic numerals and some symbols aswhite-listed characters in the file name. If you want to support local scripts (Cyrillic letters, letters with diacritics and so on), youhave to override gem is a runtime dependency and the content type is set automatically. Often you'll want to add different versions of the same file. There is built in support for this*: You must have Imagemagick installed to do image resizing. Some documentation refers to RMagick instead of Mini Magick but Mini Magick is recommended. To install Imagemagick on OSX with homebrew type the following: which makes surethat the width and height specified are filled, only croppingif the aspect ratio requires it. The above uploader could be used like this:```rubyuploader = Avatar Uploader.newuploader.store! (my_file) # size: 1024x768# = variable points to the instance object the uploader is attached to. For performance reasons, it is often useful to create versions from existing onesinstead of using the original file. If your uploader generates several versionswhere the next is smaller than the last, it will take less time to generate froma smaller, already processed image.```rubyclass My Uploader version insteadof the original version, potentially resulting in faster processing. Often you'll notice that uploaded files disappear when a validation fails. Carrier Wave has a feature that makes it easy to remember the uploaded file evenin that case. Suppose your , then save the object.```erb@user.remove_avatar! @user.save```Your users may find it convenient to upload a file from a location on the Internetvia a URL. Carrier Wave makes this simple, just add the appropriate attribute to yourform and you're good to go: option, you'll need to handle thoseerrors yourself. In many cases, especially when working with images, it might be a good idea toprovide a default url, a fallback in case no file has been uploaded. You can dothis easily by overriding the method to recreate theversions from the base file. This uses a naive approach which will re-upload andprocess the specified version or all versions, if none is passed as an argument. When you are generating random unique filenames you have to call will throw an exception on records without an image. To avoid this, scope the records to those with images or check if an image exists within the block. If you're using Active Record, recreating versions for a user avatar might look like this: It's a good idea to test your uploaders in isolation. In order to speed up yourtests, it's recommended to switch off processing in your tests, and to use thefile storage. In Rails you could do that by adding an initializer with:setting from this initializer will be ignored. If you need to test your processing, you should test it in isolation, and enableprocessing only for those tests that need it. Carrier Wave comes with some RSpec matchers which you may find useful:```rubyrequire 'carrierwave/test/matchers'describe My Uploader do include Carrier Wave:: Test:: Matcherslet(:user) let(:uploader) before do My Uploader.enableto_file) endafter do My Uploader.enable_processing = false uploader.remove! endcontext 'the thumb version' do it "scales down a landscape image to be exactly 64 by 64 pixels" do expect(uploader.thumb)have_dimensions(64, 64) end endcontext 'the small version' do it "scales down a landscape image to fit within 200 by 200 pixels" do expect(uploader.small)belarger_than(200, 200) end endit "makes the image readable only to the owner and not executable" do expect(uploader)have_permissions(0600) endit "has the correct format" do expect(uploader)be_format('png') endend```If you're looking for minitest asserts, checkout carrierwave_asserts. Setting the enable_processing flag on an uploader will prevent any of the versions from processing as well. Processing can be enabled for a single version by setting the processing flag on the version like so:directory (also known as a bucket) in an initializer. For the sake of performance it is assumed that the directory already exists, so please create it if it needs to be. You can also pass in additional options, as documented fully in lib/carrierwave/storage/ Here's a full example:ruby Carrier Wave.configure do |config| config.fog_credentials = config.fog_directory = 'name_of_bucket' # required config.fog_public = false # optional, defaults to true config.fog_attributes = # optional, defaults to # For an application which utilizes multiple servers but does not need caches persisted across requests, # uncomment the line :file instead of the default :storage. Otherwise, it will use AWS as the temp cache store. # config.cache_storage = :fileend You'll need to configure a directory (also known as a container), username and API key in the initializer. For the sake of performance it is assumed that the directory already exists, so please create it if need be. Using a US-based account: You'll need to configure a directory (also known as a bucket) and the credentials in the initializer. For the sake of performance it is assumed that the directory already exists, so please create it if need be. Please read the fog-google README on how to get credentials. For Google Storage JSON API (recommended): A couple of notes about versions:* This functionality was introduced in Fog v1.20.* This functionality is slated for Carrier Wave v1.0.0. If you're not relying on Gemfile entries alone and are requiring "carrierwave" anywhere, ensure you require "fog/rackspace/storage" before it. Ex: If you're uploading images, you'll probably want to manipulate them in some way,you might want to create thumbnail images for example. Carrier Wave comes with asmall library to make manipulating images with RMagick easier, you'll need toinclude it in your Uploader: callback, which will call that method any time afile is uploaded. Convert will only work if the file has the same file extension, thus the use of the filename method.```rubyclass Avatar Uploader fill: [200, 200] process convert: 'png'def filename super.chomp(File.extname(super)) '.png' if original_filename.present? method, which makes it easy for you to write your ownmanipulation methods. Mini Magick is similar to RMagick but performs all the operations using the 'convert'CLI which is part of the standard Image Magick kit. This allows you to have the powerof Image Magick without having to worry about installing all the RMagick libraries. See the Mini Magick site for more details:https://github.com/minimagick/minimagick And the Image Magick command line options for more for whats on offer: the Mini Magick carrierwave processor provides exactly the same methods asfor the RMagick processor.```rubyclass Avatar Uploader yamlerrors: messages: carrierwave_processing_error: failed to be processed carrierwave_integrity_error: is not of an allowed file type carrierwave_download_error: could not be downloaded extension_whitelist_error: "You are not allowed to upload % files, allowed types: %" extension_blacklist_error: "You are not allowed to upload % files, prohibited types: %" content_type_whitelist_error: "You are not allowed to upload % files, allowed types: %" content_type_blacklist_error: "You are not allowed to upload % files" rmagick_processing_error: "Failed to manipulate with rmagick, maybe it is not an image? " mini_magick_processing_error: "Failed to manipulate with Mini Magick, maybe it is not an image? Original Error: %" min_size_error: "File size should be greater than %" max_size_error: "File size should be less than %"library adds support for additional locales. By default, Carrier Wave copies an uploaded file twice, first copying the file into the cache, thencopying the file into the store. For large files, this can be prohibitively time consuming. You may change this behavior by overriding either or both of the methods return true, files will be moved (instead of copied) to the cache and store respectively. This has only been tested with the local filesystem store. By default, mounting an uploader into an Active Record model will add a fewcallbacks. For example, this code:rubybefore_save :write_avatar_identifierafter_save :store_previous_changes_for_avatarafter_commit :remove_avatar! , on: :destroyafter_commit :mark_remove_avatar_false, on: :updateafter_commit :remove_previously_stored_avatar, on: :updateafter_commit :store_avatar! , on: [:create, :update]See Copyright (c) 2008-2015 Jonas Nicklas Permission is hereby granted, free of charge, to any person obtaininga copy of this software and associated documentation files (the"Software"), to deal in the Software without restriction, includingwithout limitation the rights to use, copy, modify, merge, publish,distribute, sublicense, and/or sell copies of the Software, and topermit persons to whom the Software is furnished to do so, subject tothe following conditions: The above copyright notice and this permission notice shall beincluded in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OFMERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE ANDNONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BELIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTIONOF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTIONWITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

date: 25-Aug-2021 22:02next


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