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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
src/tool_getparam.c
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@ -138,6 +138,7 @@ static const struct LongShort aliases[]= {
{"$h", "retry-delay", ARG_STRING},
{"$i", "retry-max-time", ARG_STRING},
{"$k", "proxy-negotiate", ARG_BOOL},
{"$l", "form-escape", ARG_BOOL},
{"$m", "ftp-account", ARG_STRING},
{"$n", "proxy-anyauth", ARG_BOOL},
{"$o", "trace-time", ARG_BOOL},
@ -988,6 +989,12 @@ ParameterError getparameter(const char *flag, /* f or -long-flag */
return PARAM_LIBCURL_DOESNT_SUPPORT;
break;
case 'l': /* --form-escape */
config->mime_options &= ~CURLMIMEOPT_FORMESCAPE;
if(toggle)
config->mime_options |= CURLMIMEOPT_FORMESCAPE;
break;
case 'm': /* --ftp-account */
GetStr(&config->ftp_account, nextarg);
break;