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curl_url query urlencoding ignores + character #6086

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Rattenhirn opened this issue Oct 15, 2020 · 3 comments
Closed

curl_url query urlencoding ignores + character #6086

Rattenhirn opened this issue Oct 15, 2020 · 3 comments
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libcurl API URL

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@Rattenhirn
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Rattenhirn commented Oct 15, 2020 •
edited

I did this

{
	Curl_URL* url = curl_url();

	const char* inQuery = "hash=Al2cO3tDkcDZ3EWE5Lh+LX8TPHs=";
	char* outQuery;

	curl_url_set(url, CURLUPART_QUERY, inQuery, CURLU_URLENCODE);
	curl_url_get(url, CURLUPART_QUERY, &outQuery, CURLU_URLDECODE);

	printf("In Query:  %s\n", inQuery);
	printf("Out Query: %s\n", outQuery);

	curl_free(outQuery);
	curl_url_cleanup(url);
}

and got:

In Query:  hash=Al2cO3tDkcDZ3EWE5Lh+LX8TPHs=
Out Query: hash=Al2cO3tDkcDZ3EWE5Lh LX8TPHs=

Note that the + is gone.

I expected the following

In Query:  hash=Al2cO3tDkcDZ3EWE5Lh+LX8TPHs=
Out Query: hash=Al2cO3tDkcDZ3EWE5Lh+LX8TPHs=

I debugged into it, and it seems that there is conflict between replacing spaces with pluses, and url encoding those pluses.
Moving the plus encode part in curl_url_set below the url encode part, and removing the exception for pluses in the url encode part will probably fix the issue in this case. However, it make break other things, as this function is very semantically loaded. :)

curl/libcurl version

Built from curl-7.72.0 tar

operating system

Windows
bagder added a commit that referenced this issue Oct 15, 2020
@bagder
urlapi: URL encode a '+' in the query part
c8d2345 
... when asked to with URL CURLU_URLENCODE.

Extended test 1560 to verify.
Reported-by: Dietmar Hauser
Fixes #6086
@bagder bagder mentioned this issue Oct 15, 2020
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@bagder
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bagder commented Oct 15, 2020

I could reproduce and #6087 fixes it for me. I also added a test to verify but it would be good if you could try out the fix for your use case!

@Rattenhirn
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Fix verified!

@bagder
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bagder commented Oct 15, 2020

Excellent, thanks!

@bagder bagder closed this as completed in b7ea3d2 Oct 15, 2020
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urlapi: URL encode a '+' in the query part curl/curl
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@bagder @Rattenhirn