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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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GPG key ID: 5CC908FDB71E12C2
23 changed files with 463 additions and 30 deletions
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7
lib/setopt.c
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@ -2609,6 +2609,13 @@ CURLcode Curl_vsetopt(struct Curl_easy *data, CURLoption option, va_list param)
break;
#endif
#if (!defined(CURL_DISABLE_HTTP) && !defined(CURL_DISABLE_MIME)) || \
!defined(CURL_DISABLE_SMTP) || !defined(CURL_DISABLE_IMAP)
case CURLOPT_MIME_OPTIONS:
data->set.mime_options = va_arg(param, long);
break;
#endif
case CURLOPT_SASL_AUTHZID:
/* Authorisation identity (identity to act as) */
result = Curl_setstropt(&data->set.str[STRING_SASL_AUTHZID],