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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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6
include/curl/curl.h
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@ -2132,6 +2132,9 @@ typedef enum {
* (in seconds) */
CURLOPT(CURLOPT_MAXLIFETIME_CONN, CURLOPTTYPE_LONG, 314),
/* Set MIME option flags. */
CURLOPT(CURLOPT_MIME_OPTIONS, CURLOPTTYPE_LONG, 315),
CURLOPT_LASTENTRY /* the last unused */
} CURLoption;
@ -2291,6 +2294,9 @@ CURL_EXTERN int curl_strnequal(const char *s1, const char *s2, size_t n);
typedef struct curl_mime curl_mime; /* Mime context. */
typedef struct curl_mimepart curl_mimepart; /* Mime part context. */
/* CURLMIMEOPT_ defines are for the CURLOPT_MIME_OPTIONS option. */
#define CURLMIMEOPT_FORMESCAPE (1<<0) /* Use backslash-escaping for forms. */
/*
* NAME curl_mime_init()
*