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StringUtils.uriDecode decodes strings with non-ASCII characters incorrectly #32360

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Romanow88 opened this issue Mar 4, 2024 · 2 comments
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StringUtils.uriDecode decodes strings with non-ASCII characters incorrectly #32360

Romanow88 opened this issue Mar 4, 2024 · 2 comments
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@poutsma
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in: core Issues in core modules (aop, beans, core, context, expression) type: documentation A documentation task
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6.2.0-M1

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@Romanow88
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Romanow88 commented Mar 4, 2024 •
edited by sbrannen
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Affects: 6.1.3

StringUtils.uriDecode will take two different paths depending if "%" is found. One of these does not handle non-ASCII characters.

Fast path:

StringUtils.uriDecode("ü", StandardCharsets.UTF_8) // returns "ü"

Replace path:

StringUtils.uriDecode("%20ü", StandardCharsets.UTF_8) // returns " �"
@spring-projects-issues spring-projects-issues added the status: waiting-for-triage An issue we've not yet triaged or decided on label Mar 4, 2024
@sbrannen sbrannen added the in: core Issues in core modules (aop, beans, core, context, expression) label Mar 4, 2024
@sbrannen sbrannen changed the title StringUtils.uriDecode decodes strings with non-ascii characters incorrectly StringUtils.uriDecode decodes strings with non-ASCII characters incorrectly Mar 4, 2024
@sbrannen sbrannen added type: bug A general bug and removed status: waiting-for-triage An issue we've not yet triaged or decided on labels Mar 4, 2024
@sbrannen sbrannen self-assigned this Mar 4, 2024
@poutsma poutsma assigned poutsma and unassigned sbrannen Mar 4, 2024
@poutsma poutsma added type: documentation A documentation task and removed type: bug A general bug labels Mar 4, 2024
@poutsma poutsma added this to the 6.2.x milestone Mar 4, 2024
dumbbelloper added a commit to dumbbelloper/spring-framework that referenced this issue Mar 5, 2024
@dumbbelloper
Fix non-ASCII character handling in StringUtils.uriDecode
a353bf5 
StringUtils.uriDecode now correctly handles non-ASCII characters regardless of the presence of "%" encoding.

Previously, the method took two different paths depending on whether "%" was found, leading to incorrect handling of non-ASCII characters in the absence of "%" encoding.

This fix ensures that all characters, including non-ASCII ones, are properly decoded using the provided Charset, improving the method's reliability and consistency across all inputs.

This change addresses issues with decoding multibyte characters and ensures compatibility with a wider range of character encodings, enhancing the utility's overall functionality.

spring-projects#32360
@dumbbelloper dumbbelloper mentioned this issue Mar 5, 2024
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@dumbbelloper
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Hello, I've submitted a Pull Request that aims to address this issue: PR #32373

@poutsma
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poutsma commented Mar 5, 2024

StringUtils::uriDecode expects the input to be encoded, which means that the ü character should have been provided as %C3%BC instead. I will add a documentation note that makes this behavior clear.

Note that StringUtils::uriDecode is a low-level, internal utility method exposed via higher-level components, such as UriComponentsBuilder, that are better at dealing with [en|de]coded URIs.

@poutsma poutsma closed this as completed in 646bd7f Mar 5, 2024
@poutsma poutsma modified the milestones: 6.2.x, 6.2.0-M1 Mar 5, 2024
poutsma added a commit that referenced this issue Mar 5, 2024
@poutsma
Fix typo
6d9aba8 
See gh-32360
@sdeleuze sdeleuze mentioned this issue Mar 20, 2025
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