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handler.c
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handler.c
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/**
* @file
* Decide how to display email content
*
* @authors
* Copyright (C) 1996-2000,2002,2010,2013 Michael R. Elkins <[email protected]>
*
* @copyright
* This program is free software: you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation, either version 2 of the License, or (at your option) any later
* version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @page neo_handler Decide how to display email content
*
* Decide how to display email content
*/
#include "config.h"
#include <stddef.h>
#include <ctype.h>
#include <iconv.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include "mutt/lib.h"
#include "config/lib.h"
#include "email/lib.h"
#include "core/lib.h"
#include "mutt.h"
#include "handler.h"
#include "attach/lib.h"
#include "menu/lib.h"
#include "ncrypt/lib.h"
#include "pager/lib.h"
#include "copy.h"
#include "enriched.h"
#include "keymap.h"
#include "mailcap.h"
#include "mutt_globals.h"
#include "mutt_logging.h"
#include "muttlib.h"
#include "opcodes.h"
#include "options.h"
#include "rfc3676.h"
#ifdef ENABLE_NLS
#include <libintl.h>
#endif
#define BUFI_SIZE 1000
#define BUFO_SIZE 2000
#define TXT_HTML 1
#define TXT_PLAIN 2
#define TXT_ENRICHED 3
/**
* @defgroup handler_api Mime Handler API
*
* Prototype for a function to handle MIME parts
*
* @param b Body of the email
* @param s State of text being processed
* @retval 0 Success
* @retval -1 Error
*/
typedef int (*handler_t)(struct Body *b, struct State *s);
/**
* print_part_line - Print a separator for the Mime part
* @param s State of text being processed
* @param b Body of the email
* @param n Part number for multipart emails (0 otherwise)
*/
static void print_part_line(struct State *s, struct Body *b, int n)
{
char length[5] = { 0 };
mutt_str_pretty_size(length, sizeof(length), b->length);
state_mark_attach(s);
char *charset = mutt_param_get(&b->parameter, "charset");
if (n == 0)
{
state_printf(s, _("[-- Type: %s/%s%s%s, Encoding: %s, Size: %s --]\n"),
TYPE(b), b->subtype, charset ? "; charset=" : "",
charset ? charset : "", ENCODING(b->encoding), length);
}
else
{
state_printf(s, _("[-- Alternative Type #%d: %s/%s%s%s, Encoding: %s, Size: %s --]\n"),
n, TYPE(b), b->subtype, charset ? "; charset=" : "",
charset ? charset : "", ENCODING(b->encoding), length);
}
}
/**
* convert_to_state - Convert text and write it to a file
* @param cd Iconv conversion descriptor
* @param bufi Buffer with text to convert
* @param l Length of buffer
* @param s State to write to
*/
static void convert_to_state(iconv_t cd, char *bufi, size_t *l, struct State *s)
{
char bufo[BUFO_SIZE] = { 0 };
const char *ib = NULL;
char *ob = NULL;
size_t ibl, obl;
if (!bufi)
{
if (cd != (iconv_t) (-1))
{
ob = bufo;
obl = sizeof(bufo);
iconv(cd, NULL, NULL, &ob, &obl);
if (ob != bufo)
state_prefix_put(s, bufo, ob - bufo);
}
return;
}
if (cd == (iconv_t) (-1))
{
state_prefix_put(s, bufi, *l);
*l = 0;
return;
}
ib = bufi;
ibl = *l;
while (true)
{
ob = bufo;
obl = sizeof(bufo);
mutt_ch_iconv(cd, &ib, &ibl, &ob, &obl, 0, "?", NULL);
if (ob == bufo)
break;
state_prefix_put(s, bufo, ob - bufo);
}
memmove(bufi, ib, ibl);
*l = ibl;
}
/**
* decode_xbit - Decode xbit-encoded text
* @param s State to work with
* @param len Length of text to decode
* @param istext Mime part is plain text
* @param cd Iconv conversion descriptor
*/
static void decode_xbit(struct State *s, long len, bool istext, iconv_t cd)
{
if (!istext)
{
mutt_file_copy_bytes(s->fp_in, s->fp_out, len);
return;
}
state_set_prefix(s);
int c;
char bufi[BUFI_SIZE] = { 0 };
size_t l = 0;
while (((c = fgetc(s->fp_in)) != EOF) && len--)
{
if ((c == '\r') && len)
{
const int ch = fgetc(s->fp_in);
if (ch == '\n')
{
c = ch;
len--;
}
else
ungetc(ch, s->fp_in);
}
bufi[l++] = c;
if (l == sizeof(bufi))
convert_to_state(cd, bufi, &l, s);
}
convert_to_state(cd, bufi, &l, s);
convert_to_state(cd, 0, 0, s);
state_reset_prefix(s);
}
/**
* qp_decode_triple - Decode a quoted-printable triplet
* @param s State to work with
* @param d Decoded character
* @retval 0 Success
* @retval -1 Error
*/
static int qp_decode_triple(char *s, char *d)
{
/* soft line break */
if ((s[0] == '=') && (s[1] == '\0'))
return 1;
/* quoted-printable triple */
if ((s[0] == '=') && isxdigit((unsigned char) s[1]) && isxdigit((unsigned char) s[2]))
{
*d = (hexval(s[1]) << 4) | hexval(s[2]);
return 0;
}
/* something else */
return -1;
}
/**
* qp_decode_line - Decode a line of quoted-printable text
* @param dest Buffer for result
* @param src Text to decode
* @param l Bytes written to buffer
* @param last Last character of the line
*/
static void qp_decode_line(char *dest, char *src, size_t *l, int last)
{
char *d = NULL, *s = NULL;
char c = 0;
int kind = -1;
bool soft = false;
/* decode the line */
for (d = dest, s = src; *s;)
{
switch ((kind = qp_decode_triple(s, &c)))
{
case 0:
*d++ = c;
s += 3;
break; /* qp triple */
case -1:
*d++ = *s++;
break; /* single character */
case 1:
soft = true;
s++;
break; /* soft line break */
}
}
if (!soft && (last == '\n'))
{
/* neither \r nor \n as part of line-terminating CRLF
* may be qp-encoded, so remove \r and \n-terminate;
* see RFC2045, sect. 6.7, (1): General 8bit representation */
if ((kind == 0) && (c == '\r'))
*(d - 1) = '\n';
else
*d++ = '\n';
}
*d = '\0';
*l = d - dest;
}
/**
* decode_quoted - Decode an attachment encoded with quoted-printable
* @param s State to work with
* @param len Length of text to decode
* @param istext Mime part is plain text
* @param cd Iconv conversion descriptor
*
* Why doesn't this overflow any buffers? First, it's guaranteed that the
* length of a line grows when you _en_-code it to quoted-printable. That
* means that we always can store the result in a buffer of at most the _same_
* size.
*
* Now, we don't special-case if the line we read with fgets() isn't
* terminated. We don't care about this, since 256 > 78, so corrupted input
* will just be corrupted a bit more. That implies that 256+1 bytes are
* always sufficient to store the result of qp_decode_line.
*
* Finally, at soft line breaks, some part of a multibyte character may have
* been left over by convert_to_state(). This shouldn't be more than 6
* characters, so 256+7 should be sufficient memory to store the decoded
* data.
*
* Just to make sure that I didn't make some off-by-one error above, we just
* use 512 for the target buffer's size.
*/
static void decode_quoted(struct State *s, long len, bool istext, iconv_t cd)
{
char line[256] = { 0 };
char decline[512] = { 0 };
size_t l = 0;
size_t l3;
if (istext)
state_set_prefix(s);
while (len > 0)
{
/* It's ok to use a fixed size buffer for input, even if the line turns
* out to be longer than this. Just process the line in chunks. This
* really shouldn't happen according the MIME spec, since Q-P encoded
* lines are at most 76 characters, but we should be liberal about what
* we accept. */
if (!fgets(line, MIN((ssize_t) sizeof(line), len + 1), s->fp_in))
break;
size_t linelen = strlen(line);
len -= linelen;
/* inspect the last character we read so we can tell if we got the
* entire line. */
const int last = (linelen != 0) ? line[linelen - 1] : 0;
/* chop trailing whitespace if we got the full line */
if (last == '\n')
{
while ((linelen > 0) && IS_SPACE(line[linelen - 1]))
linelen--;
line[linelen] = '\0';
}
/* decode and do character set conversion */
qp_decode_line(decline + l, line, &l3, last);
l += l3;
convert_to_state(cd, decline, &l, s);
}
convert_to_state(cd, 0, 0, s);
state_reset_prefix(s);
}
/**
* decode_byte - Decode a uuencoded byte
* @param ch Character to decode
* @retval num Decoded value
*/
static unsigned char decode_byte(char ch)
{
if ((ch < 32) || (ch > 95))
return 0;
return ch - 32;
}
/**
* decode_uuencoded - Decode uuencoded text
* @param s State to work with
* @param len Length of text to decode
* @param istext Mime part is plain text
* @param cd Iconv conversion descriptor
*/
static void decode_uuencoded(struct State *s, long len, bool istext, iconv_t cd)
{
char tmps[128] = { 0 };
char *pt = NULL;
char bufi[BUFI_SIZE] = { 0 };
size_t k = 0;
if (istext)
state_set_prefix(s);
while (len > 0)
{
if (!fgets(tmps, sizeof(tmps), s->fp_in))
goto cleanup;
len -= mutt_str_len(tmps);
if (mutt_str_startswith(tmps, "begin "))
break;
}
while (len > 0)
{
if (!fgets(tmps, sizeof(tmps), s->fp_in))
goto cleanup;
len -= mutt_str_len(tmps);
if (mutt_str_startswith(tmps, "end"))
break;
pt = tmps;
const unsigned char linelen = decode_byte(*pt);
pt++;
for (unsigned char c = 0; (c < linelen) && *pt;)
{
for (char l = 2; (l <= 6) && pt[0] && pt[1]; l += 2)
{
char out = decode_byte(*pt) << l;
pt++;
out |= (decode_byte(*pt) >> (6 - l));
bufi[k++] = out;
c++;
if (c == linelen)
break;
}
convert_to_state(cd, bufi, &k, s);
pt++;
}
}
cleanup:
convert_to_state(cd, bufi, &k, s);
convert_to_state(cd, 0, 0, s);
state_reset_prefix(s);
}
/**
* is_mmnoask - Metamail compatibility: should the attachment be autoviewed?
* @param buf Mime type, e.g. 'text/plain'
* @retval true Metamail "no ask" is true
*
* Test if the `MM_NOASK` environment variable should allow autoviewing of the
* attachment.
*
* @note If `MM_NOASK=1` then the function will automatically return true.
*/
static bool is_mmnoask(const char *buf)
{
const char *val = mutt_str_getenv("MM_NOASK");
if (!val)
return false;
char *p = NULL;
char tmp[1024] = { 0 };
char *q = NULL;
if (mutt_str_equal(val, "1"))
return true;
mutt_str_copy(tmp, val, sizeof(tmp));
p = tmp;
while ((p = strtok(p, ",")))
{
q = strrchr(p, '/');
if (q)
{
if (q[1] == '*')
{
if (mutt_istrn_equal(buf, p, q - p))
return true;
}
else
{
if (mutt_istr_equal(buf, p))
return true;
}
}
else
{
const size_t plen = mutt_istr_startswith(buf, p);
if ((plen != 0) && (buf[plen] == '/'))
return true;
}
p = NULL;
}
return false;
}
/**
* is_autoview - Should email body be filtered by mailcap
* @param b Body of the email
* @retval 1 body part should be filtered by a mailcap entry prior to viewing inline
* @retval 0 otherwise
*/
static bool is_autoview(struct Body *b)
{
char type[256] = { 0 };
bool is_av = false;
snprintf(type, sizeof(type), "%s/%s", TYPE(b), b->subtype);
const bool c_implicit_autoview = cs_subset_bool(NeoMutt->sub, "implicit_autoview");
if (c_implicit_autoview)
{
/* $implicit_autoview is essentially the same as "auto_view *" */
is_av = true;
}
else
{
/* determine if this type is on the user's auto_view list */
mutt_check_lookup_list(b, type, sizeof(type));
struct ListNode *np = NULL;
STAILQ_FOREACH(np, &AutoViewList, entries)
{
int i = mutt_str_len(np->data) - 1;
if (((i > 0) && (np->data[i - 1] == '/') && (np->data[i] == '*') &&
mutt_istrn_equal(type, np->data, i)) ||
mutt_istr_equal(type, np->data))
{
is_av = true;
break;
}
}
if (is_mmnoask(type))
is_av = true;
}
/* determine if there is a mailcap entry suitable for auto_view
*
* @warning type is altered by this call as a result of 'mime_lookup' support */
if (is_av)
return mailcap_lookup(b, type, sizeof(type), NULL, MUTT_MC_AUTOVIEW);
return false;
}
/**
* autoview_handler - Handler for autoviewable attachments - Implements ::handler_t - @ingroup handler_api
*/
static int autoview_handler(struct Body *a, struct State *s)
{
struct MailcapEntry *entry = mailcap_entry_new();
char buf[1024] = { 0 };
char type[256] = { 0 };
struct Buffer *cmd = mutt_buffer_pool_get();
struct Buffer *tempfile = mutt_buffer_pool_get();
char *fname = NULL;
FILE *fp_in = NULL;
FILE *fp_out = NULL;
FILE *fp_err = NULL;
pid_t pid;
int rc = 0;
snprintf(type, sizeof(type), "%s/%s", TYPE(a), a->subtype);
mailcap_lookup(a, type, sizeof(type), entry, MUTT_MC_AUTOVIEW);
fname = mutt_str_dup(a->filename);
mutt_file_sanitize_filename(fname, true);
mailcap_expand_filename(entry->nametemplate, fname, tempfile);
FREE(&fname);
if (entry->command)
{
mutt_buffer_strcpy(cmd, entry->command);
/* mailcap_expand_command returns 0 if the file is required */
bool piped = mailcap_expand_command(a, mutt_buffer_string(tempfile), type, cmd);
if (s->flags & MUTT_DISPLAY)
{
state_mark_attach(s);
state_printf(s, _("[-- Autoview using %s --]\n"), mutt_buffer_string(cmd));
mutt_message(_("Invoking autoview command: %s"), mutt_buffer_string(cmd));
}
fp_in = mutt_file_fopen(mutt_buffer_string(tempfile), "w+");
if (!fp_in)
{
mutt_perror("fopen");
mailcap_entry_free(&entry);
rc = -1;
goto cleanup;
}
mutt_file_copy_bytes(s->fp_in, fp_in, a->length);
if (piped)
{
unlink(mutt_buffer_string(tempfile));
fflush(fp_in);
rewind(fp_in);
pid = filter_create_fd(mutt_buffer_string(cmd), NULL, &fp_out, &fp_err,
fileno(fp_in), -1, -1);
}
else
{
mutt_file_fclose(&fp_in);
pid = filter_create(mutt_buffer_string(cmd), NULL, &fp_out, &fp_err);
}
if (pid < 0)
{
mutt_perror(_("Can't create filter"));
if (s->flags & MUTT_DISPLAY)
{
state_mark_attach(s);
state_printf(s, _("[-- Can't run %s. --]\n"), mutt_buffer_string(cmd));
}
rc = -1;
goto bail;
}
if (s->prefix)
{
/* Remove ansi and formatting from autoview output in replies only. The
* user may want to see the formatting in the pager, but it shouldn't be
* in their quoted reply text too. */
struct Buffer *stripped = mutt_buffer_pool_get();
while (fgets(buf, sizeof(buf), fp_out))
{
mutt_buffer_strip_formatting(stripped, buf, false);
state_puts(s, s->prefix);
state_puts(s, mutt_buffer_string(stripped));
}
mutt_buffer_pool_release(&stripped);
/* check for data on stderr */
if (fgets(buf, sizeof(buf), fp_err))
{
if (s->flags & MUTT_DISPLAY)
{
state_mark_attach(s);
state_printf(s, _("[-- Autoview stderr of %s --]\n"), mutt_buffer_string(cmd));
}
state_puts(s, s->prefix);
state_puts(s, buf);
while (fgets(buf, sizeof(buf), fp_err))
{
state_puts(s, s->prefix);
state_puts(s, buf);
}
}
}
else
{
mutt_file_copy_stream(fp_out, s->fp_out);
/* Check for stderr messages */
if (fgets(buf, sizeof(buf), fp_err))
{
if (s->flags & MUTT_DISPLAY)
{
state_mark_attach(s);
state_printf(s, _("[-- Autoview stderr of %s --]\n"), mutt_buffer_string(cmd));
}
state_puts(s, buf);
mutt_file_copy_stream(fp_err, s->fp_out);
}
}
bail:
mutt_file_fclose(&fp_out);
mutt_file_fclose(&fp_err);
filter_wait(pid);
if (piped)
mutt_file_fclose(&fp_in);
else
mutt_file_unlink(mutt_buffer_string(tempfile));
if (s->flags & MUTT_DISPLAY)
mutt_clear_error();
}
cleanup:
mailcap_entry_free(&entry);
mutt_buffer_pool_release(&cmd);
mutt_buffer_pool_release(&tempfile);
return rc;
}
/**
* text_plain_handler - Handler for plain text - Implements ::handler_t - @ingroup handler_api
* @retval 0 Always
*
* When generating format=flowed ($text_flowed is set) from format=fixed, strip
* all trailing spaces to improve interoperability; if $text_flowed is unset,
* simply verbatim copy input.
*/
static int text_plain_handler(struct Body *b, struct State *s)
{
char *buf = NULL;
size_t sz = 0;
while ((buf = mutt_file_read_line(buf, &sz, s->fp_in, NULL, MUTT_RL_NO_FLAGS)))
{
const bool c_text_flowed = cs_subset_bool(NeoMutt->sub, "text_flowed");
if (!mutt_str_equal(buf, "-- ") && c_text_flowed)
{
size_t len = mutt_str_len(buf);
while ((len > 0) && (buf[len - 1] == ' '))
buf[--len] = '\0';
}
if (s->prefix)
state_puts(s, s->prefix);
state_puts(s, buf);
state_putc(s, '\n');
}
FREE(&buf);
return 0;
}
/**
* message_handler - Handler for message/rfc822 body parts - Implements ::handler_t - @ingroup handler_api
*/
static int message_handler(struct Body *a, struct State *s)
{
struct Body *b = NULL;
LOFF_T off_start;
int rc = 0;
off_start = ftello(s->fp_in);
if (off_start < 0)
return -1;
if ((a->encoding == ENC_BASE64) || (a->encoding == ENC_QUOTED_PRINTABLE) ||
(a->encoding == ENC_UUENCODED))
{
b = mutt_body_new();
b->length = mutt_file_get_size_fp(s->fp_in);
b->parts = mutt_rfc822_parse_message(s->fp_in, b);
}
else
b = a;
if (b->parts)
{
CopyHeaderFlags chflags = CH_DECODE | CH_FROM;
const bool c_weed = cs_subset_bool(NeoMutt->sub, "weed");
if ((s->flags & MUTT_WEED) || ((s->flags & (MUTT_DISPLAY | MUTT_PRINTING)) && c_weed))
chflags |= CH_WEED | CH_REORDER;
if (s->prefix)
chflags |= CH_PREFIX;
if (s->flags & MUTT_DISPLAY)
chflags |= CH_DISPLAY;
mutt_copy_hdr(s->fp_in, s->fp_out, off_start, b->parts->offset, chflags, s->prefix, 0);
if (s->prefix)
state_puts(s, s->prefix);
state_putc(s, '\n');
rc = mutt_body_handler(b->parts, s);
}
if ((a->encoding == ENC_BASE64) || (a->encoding == ENC_QUOTED_PRINTABLE) ||
(a->encoding == ENC_UUENCODED))
{
mutt_body_free(&b);
}
return rc;
}
/**
* external_body_handler - Handler for external-body emails - Implements ::handler_t - @ingroup handler_api
*/
static int external_body_handler(struct Body *b, struct State *s)
{
const char *str = NULL;
char strbuf[1024] = { 0 };
const char *access_type = mutt_param_get(&b->parameter, "access-type");
if (!access_type)
{
if (s->flags & MUTT_DISPLAY)
{
state_mark_attach(s);
state_puts(s, _("[-- Error: message/external-body has no access-type parameter --]\n"));
return 0;
}
else
return -1;
}
const char *expiration = mutt_param_get(&b->parameter, "expiration");
time_t expire;
if (expiration)
expire = mutt_date_parse_date(expiration, NULL);
else
expire = -1;
const bool c_weed = cs_subset_bool(NeoMutt->sub, "weed");
if (mutt_istr_equal(access_type, "x-mutt-deleted"))
{
if (s->flags & (MUTT_DISPLAY | MUTT_PRINTING))
{
char pretty_size[10] = { 0 };
char *length = mutt_param_get(&b->parameter, "length");
if (length)
{
long size = strtol(length, NULL, 10);
mutt_str_pretty_size(pretty_size, sizeof(pretty_size), size);
if (expire != -1)
{
str = ngettext(
/* L10N: If the translation of this string is a multi line string, then
each line should start with "[-- " and end with " --]".
The first "%s/%s" is a MIME type, e.g. "text/plain". The last %s
expands to a date as returned by `mutt_date_parse_date()`.
Note: The size argument printed is not the actual number as passed
to gettext but the prettified version, e.g. size = 2048 will be
printed as 2K. Your language might be sensitive to that: For
example although '1K' and '1024' represent the same number your
language might inflect the noun 'byte' differently.
Sadly, we can't do anything about that at the moment besides
passing the precise size in bytes. If you are interested the
function responsible for the prettification is
mutt_str_pretty_size() in mutt/string.c. */
"[-- This %s/%s attachment (size %s byte) has been deleted --]\n"
"[-- on %s --]\n",
"[-- This %s/%s attachment (size %s bytes) has been deleted --]\n"
"[-- on %s --]\n",
size);
}
else
{
str = ngettext(
/* L10N: If the translation of this string is a multi line string, then
each line should start with "[-- " and end with " --]".
The first "%s/%s" is a MIME type, e.g. "text/plain".
Note: The size argument printed is not the actual number as passed
to gettext but the prettified version, e.g. size = 2048 will be
printed as 2K. Your language might be sensitive to that: For
example although '1K' and '1024' represent the same number your
language might inflect the noun 'byte' differently.
Sadly, we can't do anything about that at the moment besides
passing the precise size in bytes. If you are interested the
function responsible for the prettification is
mutt_str_pretty_size() in mutt/string.c. */
"[-- This %s/%s attachment (size %s byte) has been deleted --]\n",
"[-- This %s/%s attachment (size %s bytes) has been deleted --]\n", size);
}
}
else
{
pretty_size[0] = '\0';
if (expire != -1)
{
/* L10N: If the translation of this string is a multi line string, then
each line should start with "[-- " and end with " --]".
The first "%s/%s" is a MIME type, e.g. "text/plain". The last %s
expands to a date as returned by `mutt_date_parse_date()`.
Caution: Argument three %3$ is also defined but should not be used
in this translation! */
str = _("[-- This %s/%s attachment has been deleted --]\n[-- on %4$s --]\n");
}
else
{
/* L10N: If the translation of this string is a multi line string, then
each line should start with "[-- " and end with " --]".
The first "%s/%s" is a MIME type, e.g. "text/plain". */
str = _("[-- This %s/%s attachment has been deleted --]\n");
}
}
snprintf(strbuf, sizeof(strbuf), str, TYPE(b->parts), b->parts->subtype,
pretty_size, expiration);
state_attach_puts(s, strbuf);
if (b->parts->filename)
{
state_mark_attach(s);
state_printf(s, _("[-- name: %s --]\n"), b->parts->filename);
}
CopyHeaderFlags chflags = CH_DECODE;
if (c_weed)
chflags |= CH_WEED | CH_REORDER;
mutt_copy_hdr(s->fp_in, s->fp_out, ftello(s->fp_in), b->parts->offset,
chflags, NULL, 0);
}
}
else if (expiration && (expire < mutt_date_epoch()))
{
if (s->flags & MUTT_DISPLAY)
{
/* L10N: If the translation of this string is a multi line string, then
each line should start with "[-- " and end with " --]".
The "%s/%s" is a MIME type, e.g. "text/plain". */
snprintf(strbuf, sizeof(strbuf),
_("[-- This %s/%s attachment is not included, --]\n[-- and the indicated external source has --]\n[-- expired. --]\n"),
TYPE(b->parts), b->parts->subtype);
state_attach_puts(s, strbuf);
CopyHeaderFlags chflags = CH_DECODE | CH_DISPLAY;
if (c_weed)
chflags |= CH_WEED | CH_REORDER;
mutt_copy_hdr(s->fp_in, s->fp_out, ftello(s->fp_in), b->parts->offset,
chflags, NULL, 0);
}
}
else
{
if (s->flags & MUTT_DISPLAY)
{
/* L10N: If the translation of this string is a multi line string, then
each line should start with "[-- " and end with " --]".
The "%s/%s" is a MIME type, e.g. "text/plain". The %s after
access-type is an access-type as defined by the MIME RFCs, e.g. "FTP",
"LOCAL-FILE", "MAIL-SERVER". */
snprintf(strbuf, sizeof(strbuf),
_("[-- This %s/%s attachment is not included, --]\n[-- and the indicated access-type %s is unsupported --]\n"),
TYPE(b->parts), b->parts->subtype, access_type);
state_attach_puts(s, strbuf);
CopyHeaderFlags chflags = CH_DECODE | CH_DISPLAY;
if (c_weed)
chflags |= CH_WEED | CH_REORDER;
mutt_copy_hdr(s->fp_in, s->fp_out, ftello(s->fp_in), b->parts->offset,
chflags, NULL, 0);
}
}
return 0;
}
/**
* alternative_handler - Handler for multipart alternative emails - Implements ::handler_t - @ingroup handler_api
*/
static int alternative_handler(struct Body *a, struct State *s)
{
struct Body *const head = a;
struct Body *choice = NULL;
struct Body *b = NULL;
bool mustfree = false;
int rc = 0;
if ((a->encoding == ENC_BASE64) || (a->encoding == ENC_QUOTED_PRINTABLE) ||
(a->encoding == ENC_UUENCODED))
{
mustfree = true;
b = mutt_body_new();
b->length = mutt_file_get_size_fp(s->fp_in);
b->parts = mutt_parse_multipart(s->fp_in, mutt_param_get(&a->parameter, "boundary"),
b->length, mutt_istr_equal("digest", a->subtype));
}
else
b = a;
a = b;
/* First, search list of preferred types */
struct ListNode *np = NULL;
STAILQ_FOREACH(np, &AlternativeOrderList, entries)
{
int btlen; /* length of basetype */
bool wild; /* do we have a wildcard to match all subtypes? */
char *c = strchr(np->data, '/');
if (c)
{
wild = ((c[1] == '*') && (c[2] == '\0'));
btlen = c - np->data;
}
else
{
wild = true;
btlen = mutt_str_len(np->data);
}
if (a->parts)
b = a->parts;
else
b = a;
while (b)
{
const char *bt = TYPE(b);
if (mutt_istrn_equal(bt, np->data, btlen) && (bt[btlen] == 0))
{
/* the basetype matches */
if (wild || mutt_istr_equal(np->data + btlen + 1, b->subtype))
{
choice = b;
}
}
b = b->next;
}
if (choice)
break;
}
/* Next, look for an autoviewable type */
if (!choice)
{
if (a->parts)
b = a->parts;
else
b = a;
while (b)
{
if (is_autoview(b))
choice = b;
b = b->next;