34 lines
1.4 KiB
Bash
34 lines
1.4 KiB
Bash
#!/bin/bash
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# This script reads a file from stdin, and moves it to a certain directory with the shortest name possible that doesn't conflict based on the sha1sum, then echos the URL the file will be available at
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#
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# Mainly meant to be used for images from scripts like open-screeny.sh, it can really be used for any file uploads, nothing is format specific
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#
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# Required dependencies are sha1sum, and standard unix utilities tee and cut
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#
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# https://github.com/moparisthebest/open-screeny
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#
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dir_name="$1" # directory to store images in
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url="$2" # url pointing to directory above
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extension="$3" # extension to put on file
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# put a . in front of the extension if it isn't empty
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[ ! -z "$extension" ] && extension=".$extension"
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tmp_name="/tmp/imgup-$$${extension}"
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sha1="$(tee "$tmp_name" | sha1sum | cut -d' ' -f1)"
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mkdir -p "$dir_name"
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# find shortest substring of hash that doesn't already exist for shortest url possible
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# you may change the 5 here to something longer or shorter for more or less security against people guessing your file name
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for x in {5..40}
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do
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new_name="${sha1:0:$x}"
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fname="${dir_name}/${new_name}${extension}"
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# if the file doesn't exist, or if it exists, but the hash is the same, break
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[ ! -e "$fname" ] || [ "$(sha1sum "$fname" | cut -d' ' -f1)" == "$sha1" ] && break
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done
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mv "$tmp_name" "$fname"
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echo "${url}/${new_name}${extension}"
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