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212 lines
7.8 KiB
Rust
212 lines
7.8 KiB
Rust
/*
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* Copyright (c) 2020-2023, Stalwart Labs Ltd.
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*
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* This file is part of the Stalwart Sieve Interpreter.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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* in the LICENSE file at the top-level directory of this distribution.
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* You can be released from the requirements of the AGPLv3 license by
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* purchasing a commercial license. Please contact licensing@stalw.art
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* for more details.
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*/
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use crate::sieve::{
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compiler::{
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grammar::actions::action_set::{Modifier, Set},
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VariableType,
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},
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runtime::Variable,
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Context, Event,
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};
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use std::fmt::Write;
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impl Set {
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pub(crate) fn exec(&self, ctx: &mut Context) {
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let mut value = ctx.eval_value(&self.value).into_owned();
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for modifier in &self.modifiers {
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value = modifier.apply(value.into_cow().as_ref(), ctx).into();
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}
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ctx.set_variable(&self.name, value);
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}
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}
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impl<'x> Context<'x> {
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pub(crate) fn set_variable(&mut self, var_name: &VariableType, mut variable: Variable<'x>) {
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if variable.len() > self.runtime.max_variable_size {
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let mut new_variable = String::with_capacity(self.runtime.max_variable_size);
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for ch in variable.into_cow().chars() {
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if ch.len_utf8() + new_variable.len() <= self.runtime.max_variable_size {
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new_variable.push(ch);
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} else {
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break;
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}
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}
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variable = new_variable.into();
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}
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match var_name {
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VariableType::Local(var_id) => {
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if let Some(var) = self.vars_local.get_mut(*var_id) {
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*var = variable.into_owned();
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} else {
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debug_assert!(false, "Non-existent local variable {var_id}");
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}
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}
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VariableType::Global(var_name) => {
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self.vars_global
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.insert(var_name.to_string().into(), variable.into_owned());
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}
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VariableType::Envelope(env) => {
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self.queued_events = vec![Event::SetEnvelope {
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envelope: *env,
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value: variable.into_string(),
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}]
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.into_iter();
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}
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_ => (),
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}
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}
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pub(crate) fn get_variable(&self, var_name: &VariableType) -> Option<&Variable<'x>> {
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match var_name {
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VariableType::Local(var_id) => self.vars_local.get(*var_id),
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VariableType::Global(var_name) => self.vars_global.get(var_name.as_str()),
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VariableType::Envelope(env) => {
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self.envelope.iter().find_map(
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|(name, val)| {
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if name == env {
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Some(val)
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} else {
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None
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}
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},
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)
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}
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_ => unreachable!(),
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}
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}
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}
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impl Modifier {
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pub(crate) fn apply(&self, input: &str, ctx: &Context) -> String {
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let max_len = ctx.runtime.max_variable_size;
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match self {
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Modifier::Lower => input.to_lowercase(),
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Modifier::Upper => input.to_uppercase(),
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Modifier::LowerFirst => {
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let mut result = String::with_capacity(input.len());
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for (pos, char) in input.chars().enumerate() {
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if result.len() + char.len_utf8() <= max_len {
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if pos != 0 {
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result.push(char);
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} else {
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for char in char.to_lowercase() {
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result.push(char);
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}
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}
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} else {
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return result;
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}
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}
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result
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}
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Modifier::UpperFirst => {
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let mut result = String::with_capacity(input.len());
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for (pos, char) in input.chars().enumerate() {
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if result.len() + char.len_utf8() <= max_len {
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if pos != 0 {
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result.push(char);
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} else {
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for char in char.to_uppercase() {
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result.push(char);
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}
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}
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} else {
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return result;
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}
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}
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result
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}
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Modifier::QuoteWildcard => {
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let mut result = String::with_capacity(input.len());
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for char in input.chars() {
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if ['*', '\\', '?'].contains(&char) {
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if result.len() + char.len_utf8() < max_len {
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result.push('\\');
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result.push(char);
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} else {
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return result;
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}
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} else if result.len() + char.len_utf8() <= max_len {
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result.push(char);
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} else {
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return result;
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}
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}
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result
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}
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Modifier::QuoteRegex => {
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let mut result = String::with_capacity(input.len());
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for char in input.chars() {
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if [
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'*', '\\', '?', '.', '[', ']', '(', ')', '+', '{', '}', '|', '^', '=', ':',
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'$',
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]
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.contains(&char)
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{
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if result.len() + char.len_utf8() < max_len {
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result.push('\\');
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result.push(char);
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} else {
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return result;
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}
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} else if result.len() + char.len_utf8() <= max_len {
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result.push(char);
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} else {
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return result;
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}
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}
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result
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}
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Modifier::Length => input.chars().count().to_string(),
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Modifier::EncodeUrl => {
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let mut buf = [0; 4];
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let mut result = String::with_capacity(input.len());
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for char in input.chars() {
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if char.is_ascii_alphanumeric() || ['-', '.', '_', '~'].contains(&char) {
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if result.len() < max_len {
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result.push(char);
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} else {
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return result;
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}
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} else if result.len() + (char.len_utf8() * 3) <= max_len {
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for byte in char.encode_utf8(&mut buf).as_bytes().iter() {
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write!(result, "%{byte:02x}").ok();
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}
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} else {
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return result;
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}
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}
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result
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}
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Modifier::Replace { find, replace } => input.replace(
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ctx.eval_value(find).into_cow().as_ref(),
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ctx.eval_value(replace).into_cow().as_ref(),
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),
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}
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}
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}
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