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cmd-extracttext.c
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cmd-extracttext.c
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/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
*/
#include "lib.h"
#include "str.h"
#include "array.h"
#include "sieve-common.h"
#include "sieve-extensions.h"
#include "sieve-code.h"
#include "sieve-ast.h"
#include "sieve-commands.h"
#include "sieve-binary.h"
#include "sieve-message.h"
#include "sieve-validator.h"
#include "sieve-generator.h"
#include "sieve-interpreter.h"
#include "sieve-dump.h"
#include "sieve-ext-variables.h"
#include "ext-mime-common.h"
/*
* Extracttext command
*
* Syntax:
* extracttext [MODIFIER] [":first" number] <varname: string>
*/
static bool cmd_extracttext_registered
(struct sieve_validator *valdtr, const struct sieve_extension *ext,
struct sieve_command_registration *cmd_reg);
static bool cmd_extracttext_validate
(struct sieve_validator *valdtr, struct sieve_command *cmd);
static bool cmd_extracttext_generate
(const struct sieve_codegen_env *cgenv, struct sieve_command *ctx);
const struct sieve_command_def cmd_extracttext = {
.identifier = "extracttext",
.type = SCT_COMMAND,
.positional_args = 1,
.subtests = 0,
.block_allowed = FALSE,
.block_required = FALSE,
.registered = cmd_extracttext_registered,
.validate = cmd_extracttext_validate,
.generate = cmd_extracttext_generate
};
/*
* Extracttext command tags
*/
enum cmd_extracttext_optional {
CMD_EXTRACTTEXT_OPT_END,
CMD_EXTRACTTEXT_OPT_FIRST
};
static bool cmd_extracttext_validate_first_tag
(struct sieve_validator *valdtr, struct sieve_ast_argument **arg,
struct sieve_command *cmd);
static const struct sieve_argument_def extracttext_from_tag = {
.identifier = "first",
.validate = cmd_extracttext_validate_first_tag
};
/*
* Extracttext operation
*/
static bool cmd_extracttext_operation_dump
(const struct sieve_dumptime_env *denv, sieve_size_t *address);
static int cmd_extracttext_operation_execute
(const struct sieve_runtime_env *renv, sieve_size_t *address);
const struct sieve_operation_def extracttext_operation = {
.mnemonic = "EXTRACTTEXT",
.ext_def = &extracttext_extension,
.dump = cmd_extracttext_operation_dump,
.execute = cmd_extracttext_operation_execute
};
/*
* Compiler context
*/
struct cmd_extracttext_context {
ARRAY_TYPE(sieve_variables_modifier) modifiers;
};
/*
* Tag validation
*/
static bool cmd_extracttext_validate_first_tag
(struct sieve_validator *valdtr, struct sieve_ast_argument **arg,
struct sieve_command *cmd)
{
struct sieve_ast_argument *tag = *arg;
/* Detach the tag itself */
*arg = sieve_ast_arguments_detach(*arg,1);
/* Check syntax:
* :first <number>
*/
if ( !sieve_validate_tag_parameter
(valdtr, cmd, tag, *arg, NULL, 0, SAAT_NUMBER, FALSE) )
return FALSE;
/* Skip parameter */
*arg = sieve_ast_argument_next(*arg);
return TRUE;
}
/* Command registration */
static bool cmd_extracttext_registered
(struct sieve_validator *valdtr, const struct sieve_extension *ext,
struct sieve_command_registration *cmd_reg)
{
struct ext_extracttext_context *ectx =
(struct ext_extracttext_context *)ext->context;
sieve_validator_register_tag(valdtr, cmd_reg, ext,
&extracttext_from_tag, CMD_EXTRACTTEXT_OPT_FIRST);
sieve_variables_modifiers_link_tag
(valdtr, ectx->var_ext, cmd_reg);
return TRUE;
}
/*
* Command validation
*/
static bool cmd_extracttext_validate(struct sieve_validator *valdtr,
struct sieve_command *cmd)
{
const struct sieve_extension *this_ext = cmd->ext;
struct ext_extracttext_context *ectx =
(struct ext_extracttext_context *)this_ext->context;
struct sieve_ast_node *node = cmd->ast_node;
struct sieve_ast_argument *arg = cmd->first_positional;
pool_t pool = sieve_command_pool(cmd);
struct cmd_extracttext_context *sctx;
/* Create command context */
sctx = p_new(pool, struct cmd_extracttext_context, 1);
p_array_init(&sctx->modifiers, pool, 4);
cmd->data = (void *) sctx;
/* Validate modifiers */
if ( !sieve_variables_modifiers_validate
(valdtr, cmd, &sctx->modifiers) )
return FALSE;
/* Validate varname argument */
if ( !sieve_validate_positional_argument
(valdtr, cmd, arg, "varname", 1, SAAT_STRING) ) {
return FALSE;
}
if ( !sieve_variable_argument_activate
(ectx->var_ext, ectx->var_ext, valdtr, cmd, arg, TRUE) )
return FALSE;
/* Check foreverypart context */
i_assert(node != NULL);
while ( node != NULL ) {
if ( node->command != NULL &&
sieve_command_is(node->command, cmd_foreverypart) )
break;
node = sieve_ast_node_parent(node);
}
if ( node == NULL ) {
sieve_command_validate_error(valdtr, cmd,
"the extracttext command is not placed inside "
"a foreverypart loop");
return FALSE;
}
return TRUE;
}
/*
* Code generation
*/
static bool cmd_extracttext_generate
(const struct sieve_codegen_env *cgenv, struct sieve_command *cmd)
{
const struct sieve_extension *this_ext = cmd->ext;
struct sieve_binary_block *sblock = cgenv->sblock;
struct cmd_extracttext_context *sctx =
(struct cmd_extracttext_context *) cmd->data;
sieve_operation_emit(sblock, this_ext, &extracttext_operation);
/* Generate arguments */
if ( !sieve_generate_arguments(cgenv, cmd, NULL) )
return FALSE;
/* Generate modifiers */
if ( !sieve_variables_modifiers_generate
(cgenv, &sctx->modifiers) )
return FALSE;
return TRUE;
}
/*
* Code dump
*/
static bool cmd_extracttext_operation_dump
(const struct sieve_dumptime_env *denv, sieve_size_t *address)
{
int opt_code = 0;
sieve_code_dumpf(denv, "EXTRACTTEXT");
sieve_code_descend(denv);
/* Dump optional operands */
for (;;) {
int opt;
bool opok = TRUE;
if ( (opt=sieve_opr_optional_dump(denv, address, &opt_code)) < 0 )
return FALSE;
if ( opt == 0 ) break;
switch ( opt_code ) {
case CMD_EXTRACTTEXT_OPT_FIRST:
opok = sieve_opr_number_dump(denv, address, "first");
break;
default:
return FALSE;
}
if ( !opok ) return FALSE;
}
/* Print both variable name and string value */
if ( !sieve_opr_string_dump(denv, address, "varname") )
return FALSE;
return sieve_variables_modifiers_code_dump(denv, address);
}
/*
* Code execution
*/
static int cmd_extracttext_operation_execute
(const struct sieve_runtime_env *renv, sieve_size_t *address)
{
const struct sieve_extension *this_ext = renv->oprtn->ext;
struct ext_extracttext_context *ectx =
(struct ext_extracttext_context *)this_ext->context;
struct sieve_variable_storage *storage;
ARRAY_TYPE(sieve_variables_modifier) modifiers;
struct ext_foreverypart_runtime_loop *sfploop;
struct sieve_message_part *mpart;
struct sieve_message_part_data mpart_data;
int opt_code = 0;
sieve_number_t first = 0;
string_t *value;
unsigned int var_index;
bool have_first = FALSE;
int ret = SIEVE_EXEC_OK;
/*
* Read the normal operands
*/
/* Optional operands */
for (;;) {
int opt;
if ( (opt=sieve_opr_optional_read
(renv, address, &opt_code)) < 0 )
return SIEVE_EXEC_BIN_CORRUPT;
if ( opt == 0 ) break;
switch ( opt_code ) {
case CMD_EXTRACTTEXT_OPT_FIRST:
ret = sieve_opr_number_read
(renv, address, "first", &first);
have_first = TRUE;
break;
default:
sieve_runtime_trace_error(renv, "unknown optional operand");
return SIEVE_EXEC_BIN_CORRUPT;
}
if ( ret <= 0 ) return ret;
}
/* Varname operand */
if ( (ret=sieve_variable_operand_read
(renv, address, "varname", &storage, &var_index)) <= 0 )
return ret;
/* Modifiers */
if ( (ret=sieve_variables_modifiers_code_read
(renv, address, &modifiers)) <= 0 )
return ret;
/*
* Determine and assign the value
*/
sieve_runtime_trace(renv, SIEVE_TRLVL_COMMANDS, "extracttext command");
sieve_runtime_trace_descend(renv);
sfploop = ext_foreverypart_runtime_loop_get_current(renv);
if ( sfploop == NULL ) {
sieve_runtime_trace_error(renv,
"outside foreverypart context");
return SIEVE_EXEC_BIN_CORRUPT;
}
/* Get current message part */
mpart = sieve_message_part_iter_current(&sfploop->part_iter);
i_assert( mpart != NULL );
/* Get message part content */
sieve_message_part_get_data(mpart, &mpart_data, TRUE);
/* Apply ":first" limit, if any */
if ( !have_first || (size_t)first > mpart_data.size ) {
value = t_str_new_const(mpart_data.content, mpart_data.size);
} else {
value = t_str_new((size_t)first);
str_append_data(value, mpart_data.content, (size_t)first);
}
/* Apply modifiers */
if ( (ret=sieve_variables_modifiers_apply
(renv, ectx->var_ext, &modifiers, &value)) <= 0 )
return ret;
/* Actually assign the value if all is well */
i_assert ( value != NULL );
if ( !sieve_variable_assign(storage, var_index, value) )
return SIEVE_EXEC_BIN_CORRUPT;
/* Trace */
if ( sieve_runtime_trace_active(renv, SIEVE_TRLVL_COMMANDS) ) {
const char *var_name, *var_id;
(void)sieve_variable_get_identifier(storage, var_index, &var_name);
var_id = sieve_variable_get_varid(storage, var_index);
sieve_runtime_trace_here(renv, 0, "assign `%s' [%s] = \"%s\"",
var_name, var_id, str_c(value));
}
return SIEVE_EXEC_OK;
}