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64 lines
1.4 KiB
Org Mode
64 lines
1.4 KiB
Org Mode
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:PROPERTIES:
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:ID: 8750a413-7cb8-4160-b4b3-3b54265b2825
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:END:
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#+title: Percent encoding in Bash
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#+date: "2021-06-23 21:10:33 +08:00"
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#+date_modified: "2021-06-24 20:42:43 +08:00"
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#+language: en
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Percent-encoding is commonly used in URLs.
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Pretty nice especially when used with spaces.
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Based from [[https://gist.github.com/cdown/1163649][this implementation]].
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It was modified to be closer to the output from [[https://docs.python.org/3.8/library/urllib.parse.html#urllib.parse.urlencode][Python =urlencode=]].
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#+begin_src bash
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function urlencode {
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local msg=$1
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local length="${#1}"
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for (( i = 0; i < length; i++ )); do
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local ch="${msg:i:1}"
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case $ch in
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[a-zA-Z0-9.~_-])
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printf "%c" $ch;;
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,*)
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printf '%s' "$ch" | xxd -plain -cols 1 | {
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while read hex; do
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printf "%%%s" $hex
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done
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};;
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esac
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done
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printf "\n"
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}
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urlencode "El Doggo"
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urlencode "El Niño"
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urlencode "Whoa there, sonny!"
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#+end_src
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#+results:
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: ElDoggo
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: ElNi<4E>o
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: Whoatheresonny
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To decode percent-encoded strings:
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#+begin_src bash
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function urldecode {
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# urldecode <string>
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local url_encoded="${1//+/ }"
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printf '%b\n' "${url_encoded//%/\\x}"
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}
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urldecode "El%20Doggo"
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urldecode "%e9%bd%8b%e8%97%a4%e3%83%bbB%e3%83%bb%e6%a5%b5%e3%83%bb%e5%b0%86%e5%97%a3"
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#+end_src
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#+results:
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: El Doggo
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: 齋藤・ B ・極・将嗣
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