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mime: use percent-escaping for multipart form field and file names

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Until now, form field and file names where escaped using the
backslash-escaping algorithm defined for multipart mails. This commit
replaces this with the percent-escaping method for URLs.

As this may introduce incompatibilities with server-side applications, a
new libcurl option CURLOPT_MIME_OPTIONS with bitmask
CURLMIMEOPT_FORMESCAPE is introduced to revert to legacy use of
backslash-escaping. This is controlled by new cli tool option
--form-escape.

New tests and documentation are provided for this feature.

Reported by: Ryan Sleevi
Fixes #7789
Closes #7805
This commit is contained in:
Patrick Monnerat 2021-10-25 12:58:37 +02:00 • committed by Daniel Stenberg
parent 6ec28eb687
commit b20b364764
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23 changed files with 463 additions and 30 deletions
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3
src/tool_listhelp.c
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@ -193,6 +193,9 @@ const struct helptxt helptext[] = {
{"-F, --form <name=content>",
"Specify multipart MIME data",
CURLHELP_HTTP | CURLHELP_UPLOAD},
{" --form-escape",
"Escape multipart form field/file names using backslash",
CURLHELP_HTTP | CURLHELP_POST},
{" --form-string <name=string>",
"Specify multipart MIME data",
CURLHELP_HTTP | CURLHELP_UPLOAD},