28 lines
838 B
Plaintext
28 lines
838 B
Plaintext
create or replace function hex2chr(pxx) as
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replace(pxx,'%','').from_hex().decode() ;
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create or replace function urldecode(url) as (
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WITH RECURSIVE cte AS (
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-- Base case: set xx as the first sequence of %XX encodings if any
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SELECT
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replace(url, '+', ' ') AS decoded,
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regexp_extract(replace(url, '+', ' '), '(%[0-9A-Fa-f]{2})+') AS xx
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UNION ALL
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-- Recursive case: replace the xx encodings with the decoded character(s)
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SELECT
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replace(decoded, xx, xx.hex2chr()) AS decoded,
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regexp_extract(replace(decoded, xx, ' '), '(%[0-9A-Fa-f]{2})+') as xx
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FROM cte
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WHERE xx != ''
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)
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SELECT decoded FROM cte
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WHERE xx = ''
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);
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SELECT s, url_decode(s), urldecode(s)
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FROM unnest( [
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'http%3A%2F%2Ffoo%20bar%2F',
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'google.com/search?q=%60Abdu%27l-Bah%C3%A1',
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'%25%32%35'
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]) _(s);
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