For this we'll use FileUtils mv which takes two arguments, the file name and the destination we want to move it to. Now we've downloaded the file safely and efficiently and stored it permanently on our hard drive. Down takes a bunch of other options too, to control the download experience.
This stops attacker tying up your server with giant image downloads. If you wanted to download a file that was at most 5MB in size with at most 5 redirects, you would use:. In this post we've seen how to download images using both open-uri and Down.
Down is much safer as it saves us from infinite redirect loops and remote code injection, and it is more user friendly as it always returns a Tempfile and lets us easily restrict file size. Have you used alternative methods for downloading images in Ruby? Let me know how in the comments below or on Twitter at philnash.
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I suspect not otherwise your code seems like a direct copy of your first example. And what happens when you replace the open "sample. Shadwell; this is the first example I've posted. Okay, so maerics' question still stands then. What have you tried so far? I assume more than just running the code from the first example and hoping it magically works! Add a comment.
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Thanks; I was looking for an httparty example in binary mode like this. Thanks : — Arup Rakshit. When you create a Tempfile object, it will create a temporary file with a unique filename.
A Tempfile objects behaves just like a File object, and you can perform all the usual file operations on it: reading data, writing data, changing its permissions, etc. So although this class does not explicitly document all instance methods supported by File, you can in fact call any File instance method on a Tempfile object.
When a Tempfile object is garbage collected, or when the Ruby interpreter exits, its associated temporary file is automatically deleted.
This means that's it's unnecessary to explicitly delete a Tempfile after use, though it's good practice to do so: not explicitly deleting unused Tempfiles can potentially leave behind large amounts of tempfiles on the filesystem until they're garbage collected.
The existence of these temp files can make it harder to determine a new Tempfile filename. Therefore, one should always call unlink or close in an ensure block, like this:. Note that Tempfile. This removes the filesystem entry without closing the file handle, so it ensures that only the processes that already had the file handle open can access the file's contents. It's strongly recommended that you do this if you do not want any other processes to be able to read from or write to the Tempfile , and you do not need to know the Tempfile's filename either.
For example, a practical use case for unlink-after-creation would be this: you need a large byte buffer that's too large to comfortably fit in RAM, e.
Please refer to unlink for more information and a code example. Tempfile's filename picking method is both thread-safe and inter-process-safe: it guarantees that no other threads or processes will pick the same filename. Tempfile itself however may not be entirely thread-safe. If you access the same Tempfile object from multiple threads then you should protect it with a mutex. Creates a temporary file as a usual File object not a Tempfile. It does not use finalizer and delegation, which makes it more efficient and reliable.
If no block is given, this is similar to Tempfile. In the latter form, the temporary file's base name will begin with the array's first element, and end with the second element. For example:. The temporary file will be placed in the directory as specified by the tmpdir parameter. By default, this is Dir. Please note that ENV values are tainted by default, and Dir.
You can also pass an options hash. Under the hood, Tempfile creates the temporary file using File. These options will be passed to File. This is mostly useful for specifying encoding options, e. If Tempfile. If no block is given, this is a synonym for Tempfile.
If a block is given, then a Tempfile object will be constructed, and the block is run with said object as argument. The Tempfile object will be automatically closed after the block terminates. Closes the file. Of course, you can choose to later call unlink if you do not unlink it now. If you don't explicitly unlink the temporary file, the removal will be delayed until the object is finalized.
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