feat: sieve transpilation to intermediate rule-list with parser and interpreter (#117)
Implements a three-phase Sieve email filtering pipeline: - Data models (SieveCondition, SieveAction, SieveRule) as sealed Dart classes - SieveParser: converts RFC 5228 Sieve scripts to a flat SieveRule list, supporting if/elsif/else, allof/anyof, header/size/exists tests, and all common actions (fileinto, keep, discard, flag, mark) - SieveInterpreter: evaluates compiled rules against a SieveEmailContext, tracking routing state in SieveExecutionContext with implicit keep behaviour - 40 unit tests covering parser correctness and interpreter execution Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
Thomas SharedInbox
co-authored by
Claude Sonnet 4.6
Claude Sonnet 4.6
parent
7a3661dda4
commit
606958e675
@@ -0,0 +1,17 @@
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sealed class SieveAction {}
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final class FileIntoAction extends SieveAction {
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FileIntoAction(this.folder);
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final String folder;
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}
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final class KeepAction extends SieveAction {}
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final class DiscardAction extends SieveAction {}
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final class MarkAsSeenAction extends SieveAction {}
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final class FlagAction extends SieveAction {
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FlagAction(this.flags);
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final List<String> flags;
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}
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@@ -0,0 +1,14 @@
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sealed class SieveCondition {}
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final class HeaderCondition extends SieveCondition {
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HeaderCondition(this.headers, this.matchType, this.keyList);
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final List<String> headers;
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final String matchType; // ':contains', ':is', ':matches'
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final List<String> keyList;
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}
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final class SizeCondition extends SieveCondition {
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SizeCondition(this.comparison, this.bytes);
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final String comparison; // ':over' or ':under'
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final int bytes;
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}
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@@ -0,0 +1,135 @@
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import 'package:sharedinbox/core/sieve/sieve_actions.dart';
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import 'package:sharedinbox/core/sieve/sieve_conditions.dart';
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import 'package:sharedinbox/core/sieve/sieve_rule.dart';
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/// A lightweight email representation used by [SieveInterpreter].
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/// Header names are lower-cased.
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class SieveEmailContext {
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const SieveEmailContext({required this.headers, this.sizeBytes = 0});
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final Map<String, List<String>> headers;
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final int sizeBytes;
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List<String> getHeader(String name) =>
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headers[name.toLowerCase()] ?? const [];
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}
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/// Tracks the outcome of running a Sieve script against one email.
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class SieveExecutionContext {
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bool isCancelled = false;
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Set<String> targetFolders = {};
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Set<String> flagsToAdd = {};
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bool keepInInbox = true;
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}
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/// Evaluates a compiled list of [SieveRule]s against a [SieveEmailContext].
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class SieveInterpreter {
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/// Executes [rules] and returns the resulting [SieveExecutionContext].
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///
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/// Rules produced by [SieveParser] may carry a [SieveRule.branchGroupId]
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/// to represent if/elsif/else chains; at most one branch per group fires.
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SieveExecutionContext execute(
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List<SieveRule> rules,
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SieveEmailContext email,
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) {
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final ctx = SieveExecutionContext();
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final firedGroups = <int>{};
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for (final rule in rules) {
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if (ctx.isCancelled) break;
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final groupId = rule.branchGroupId;
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if (groupId != null && firedGroups.contains(groupId)) continue;
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bool matches;
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if (rule.isElseBranch) {
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matches = true; // else fires unconditionally (group not yet consumed)
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} else {
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matches = _evaluateConditions(rule, email);
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}
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if (matches) {
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_applyActions(rule.actions, ctx);
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if (groupId != null) firedGroups.add(groupId);
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if (ctx.isCancelled) break;
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}
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}
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// Implicit keep: if no fileinto/discard was reached, email stays in inbox.
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return ctx;
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}
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bool _evaluateConditions(SieveRule rule, SieveEmailContext email) {
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if (rule.conditions.isEmpty) return true;
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return switch (rule.joinType) {
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'allof' => rule.conditions.every((c) => _evalCondition(c, email)),
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'anyof' => rule.conditions.any((c) => _evalCondition(c, email)),
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_ => rule.conditions.length == 1 &&
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_evalCondition(rule.conditions.first, email),
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};
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}
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bool _evalCondition(SieveCondition cond, SieveEmailContext email) {
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return switch (cond) {
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final HeaderCondition c => _evalHeader(c, email),
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final SizeCondition c => _evalSize(c, email),
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};
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}
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bool _evalHeader(HeaderCondition cond, SieveEmailContext email) {
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for (final header in cond.headers) {
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final values = email.getHeader(header);
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for (final value in values) {
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for (final key in cond.keyList) {
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if (_matchString(value, cond.matchType, key)) return true;
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}
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}
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}
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return false;
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}
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bool _evalSize(SizeCondition cond, SieveEmailContext email) {
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return switch (cond.comparison) {
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':over' => email.sizeBytes > cond.bytes,
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':under' => email.sizeBytes < cond.bytes,
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_ => false,
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};
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}
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bool _matchString(String value, String matchType, String key) {
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final v = value.toLowerCase();
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final k = key.toLowerCase();
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return switch (matchType) {
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':contains' => k.isEmpty || v.contains(k),
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':is' => v == k,
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':matches' => _globMatch(v, k),
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_ => false,
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};
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}
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bool _globMatch(String value, String pattern) {
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final regexStr =
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RegExp.escape(pattern).replaceAll(r'\*', '.*').replaceAll(r'\?', '.');
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return RegExp('^$regexStr\$').hasMatch(value);
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}
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void _applyActions(List<SieveAction> actions, SieveExecutionContext ctx) {
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for (final action in actions) {
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switch (action) {
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case final FileIntoAction a:
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ctx.targetFolders.add(a.folder);
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ctx.keepInInbox = false;
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case DiscardAction():
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ctx.isCancelled = true;
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ctx.keepInInbox = false;
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return;
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case KeepAction():
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ctx.keepInInbox = true;
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case MarkAsSeenAction():
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ctx.flagsToAdd.add(r'\Seen');
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case final FlagAction a:
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ctx.flagsToAdd.addAll(a.flags);
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}
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}
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}
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}
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@@ -0,0 +1,593 @@
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import 'package:sharedinbox/core/sieve/sieve_actions.dart';
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import 'package:sharedinbox/core/sieve/sieve_conditions.dart';
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import 'package:sharedinbox/core/sieve/sieve_rule.dart';
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/// Parses a Sieve script (RFC 5228 subset) into a flat list of [SieveRule]s.
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///
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/// Supported commands: require, if, elsif, else, fileinto, keep, discard,
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/// flag, setflag, addflag, stop.
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/// Supported tests: header, address, size, exists, allof, anyof, not, true.
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/// Supported match types: :contains, :is, :matches.
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class SieveParser {
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List<SieveRule> parse(String script) {
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final scanner = _Scanner(script);
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final rules = <SieveRule>[];
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_parseStatements(scanner, rules);
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return rules;
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}
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void _parseStatements(_Scanner s, List<SieveRule> out) {
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while (!s.isAtEnd) {
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s.skipWhitespaceAndComments();
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if (s.isAtEnd) break;
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final word = s.peekWord();
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if (word == null) break;
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if (word == 'require') {
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_parseRequire(s);
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} else if (word == 'if') {
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_parseIf(s, out);
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} else if (word == 'elsif' || word == 'else') {
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// Reached by _parseIf, should not appear at top level.
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break;
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} else if (word == '}') {
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break;
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} else {
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final action = _tryParseAction(s);
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if (action != null) {
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out.add(
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SieveRule(
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joinType: 'single',
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conditions: const [],
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actions: [action],
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),
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);
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} else {
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s.skipToNextSemicolon();
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}
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}
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}
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}
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void _parseRequire(_Scanner s) {
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s.expectWord('require');
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s.skipWhitespaceAndComments();
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_parseStringOrList(s); // discard capability list
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s.skipWhitespaceAndComments();
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s.expectChar(';');
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}
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// Monotonically increasing id shared per parse run, threaded via closure.
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int _groupCounter = 0;
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void _parseIf(_Scanner s, List<SieveRule> out) {
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final groupId = ++_groupCounter;
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s.expectWord('if');
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s.skipWhitespaceAndComments();
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final (joinType, conditions) = _parseTest(s);
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s.skipWhitespaceAndComments();
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final ifActions = _parseBlock(s);
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out.add(
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SieveRule(
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joinType: joinType,
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conditions: conditions,
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actions: ifActions,
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branchGroupId: groupId,
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),
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);
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// Parse zero or more elsif branches.
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while (true) {
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s.skipWhitespaceAndComments();
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if (s.peekWord() != 'elsif') break;
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s.expectWord('elsif');
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s.skipWhitespaceAndComments();
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final (ej, ec) = _parseTest(s);
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s.skipWhitespaceAndComments();
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final elsifActions = _parseBlock(s);
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out.add(
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SieveRule(
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joinType: ej,
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conditions: ec,
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actions: elsifActions,
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branchGroupId: groupId,
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),
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);
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}
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// Optional else branch.
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s.skipWhitespaceAndComments();
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if (s.peekWord() == 'else') {
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s.expectWord('else');
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s.skipWhitespaceAndComments();
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final elseActions = _parseBlock(s);
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out.add(
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SieveRule(
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joinType: 'single',
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conditions: const [],
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actions: elseActions,
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branchGroupId: groupId,
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isElseBranch: true,
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),
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);
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}
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}
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List<SieveAction> _parseBlock(_Scanner s) {
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s.expectChar('{');
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final blockRules = <SieveRule>[];
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_parseStatements(s, blockRules);
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s.skipWhitespaceAndComments();
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s.expectChar('}');
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return blockRules.expand((r) => r.actions).toList();
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}
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/// Returns (joinType, conditions).
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(String, List<SieveCondition>) _parseTest(_Scanner s) {
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s.skipWhitespaceAndComments();
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final word = s.peekWord();
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if (word == 'allof' || word == 'anyof') {
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s.readWord();
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s.skipWhitespaceAndComments();
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s.expectChar('(');
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final conditions = <SieveCondition>[];
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while (true) {
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s.skipWhitespaceAndComments();
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if (s.peek() == ')') break;
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final (_, conds) = _parseTest(s);
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conditions.addAll(conds);
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s.skipWhitespaceAndComments();
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if (s.peek() == ',') {
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s.advance();
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} else {
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break;
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}
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}
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s.skipWhitespaceAndComments();
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s.expectChar(')');
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return (word!, conditions);
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}
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final cond = _parseSingleTest(s);
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return ('single', cond != null ? [cond] : []);
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}
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SieveCondition? _parseSingleTest(_Scanner s) {
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s.skipWhitespaceAndComments();
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final word = s.peekWord()?.toLowerCase();
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if (word == null) return null;
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if (word == 'not') {
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s.readWord();
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s.skipWhitespaceAndComments();
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// Negation is not represented in the flat rule model; the caller
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// should handle the negated condition separately. For now we parse
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// and return the inner condition unchanged (best-effort for this subset).
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return _parseSingleTest(s);
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}
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if (word == 'true') {
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s.readWord();
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return null; // no condition = always matches
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}
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if (word == 'header' || word == 'address') {
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s.readWord();
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s.skipWhitespaceAndComments();
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final matchType = _parseMatchType(s);
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s.skipWhitespaceAndComments();
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// Consume optional :comparator "..." tagged argument.
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if (s.peekTaggedArg() == ':comparator') {
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s.readWord();
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s.skipWhitespaceAndComments();
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_parseStringOrList(s); // discard comparator value
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s.skipWhitespaceAndComments();
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}
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final headers = _parseStringOrList(s);
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s.skipWhitespaceAndComments();
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final keys = _parseStringOrList(s);
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return HeaderCondition(headers, matchType, keys);
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}
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if (word == 'exists') {
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s.readWord();
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s.skipWhitespaceAndComments();
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final headers = _parseStringOrList(s);
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// Represent exists as :contains "" so any non-empty value matches.
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return HeaderCondition(headers, ':contains', const ['']);
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}
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if (word == 'size') {
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s.readWord();
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s.skipWhitespaceAndComments();
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final comp = s.readTaggedArg(); // :over or :under
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s.skipWhitespaceAndComments();
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final bytes = _parseSizeNumber(s);
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return SizeCondition(comp, bytes);
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}
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// Unknown test — skip to closing paren or brace.
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s.readWord();
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return null;
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}
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String _parseMatchType(_Scanner s) {
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s.skipWhitespaceAndComments();
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final tag = s.peekTaggedArg();
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if (tag == ':contains' || tag == ':is' || tag == ':matches') {
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s.readWord();
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return tag!;
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}
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// Default per RFC 5228 is :is.
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return ':is';
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}
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List<String> _parseStringOrList(_Scanner s) {
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s.skipWhitespaceAndComments();
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if (s.peek() == '[') {
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s.advance(); // consume '['
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final items = <String>[];
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while (true) {
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s.skipWhitespaceAndComments();
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if (s.peek() == ']') {
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s.advance();
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break;
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}
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items.add(_parseString(s));
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s.skipWhitespaceAndComments();
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if (s.peek() == ',') {
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s.advance();
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}
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}
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return items;
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}
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return [_parseString(s)];
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}
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String _parseString(_Scanner s) {
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s.skipWhitespaceAndComments();
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if (s.peek() == '"') {
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return s.readQuotedString();
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}
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// Multi-line text: text:...\r\n.\r\n (RFC 5228 §2.4.2)
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if (s.peekWord()?.toLowerCase() == 'text:') {
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return s.readTextBlock();
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}
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throw SieveParseException(
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'Expected string at position ${s.position}: "${s.remaining.substring(0, 20)}"',
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);
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}
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int _parseSizeNumber(_Scanner s) {
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final digits = s.readDigits();
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final value = int.parse(digits);
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final unit = s.peekSizeUnit();
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if (unit != null) {
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s.advance();
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return switch (unit.toUpperCase()) {
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'K' => value * 1024,
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'M' => value * 1024 * 1024,
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'G' => value * 1024 * 1024 * 1024,
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_ => value,
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};
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}
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return value;
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}
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SieveAction? _tryParseAction(_Scanner s) {
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s.skipWhitespaceAndComments();
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final word = s.peekWord()?.toLowerCase();
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if (word == null) return null;
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if (word == 'fileinto') {
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s.readWord();
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s.skipWhitespaceAndComments();
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final folder = _parseString(s);
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s.skipWhitespaceAndComments();
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s.expectChar(';');
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return FileIntoAction(folder);
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}
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if (word == 'keep') {
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s.readWord();
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s.skipWhitespaceAndComments();
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s.expectChar(';');
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return KeepAction();
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}
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if (word == 'discard') {
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s.readWord();
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s.skipWhitespaceAndComments();
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s.expectChar(';');
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return DiscardAction();
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}
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if (word == 'stop') {
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s.readWord();
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s.skipWhitespaceAndComments();
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s.expectChar(';');
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return KeepAction(); // stop with no prior action = implicit keep
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}
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if (word == 'flag' || word == 'setflag' || word == 'addflag') {
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s.readWord();
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s.skipWhitespaceAndComments();
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// Optional variable name (string arg before the flag list).
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final peek = s.peek();
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List<String> flags;
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if (peek == '"') {
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final first = _parseString(s);
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s.skipWhitespaceAndComments();
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if (s.peek() == '[' || s.peek() == '"') {
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// first was the variable name, next is the flag list
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flags = _parseStringOrList(s);
|
||||
} else {
|
||||
flags = [first];
|
||||
}
|
||||
} else {
|
||||
flags = _parseStringOrList(s);
|
||||
}
|
||||
s.skipWhitespaceAndComments();
|
||||
s.expectChar(';');
|
||||
if (flags.any(
|
||||
(f) => f.toLowerCase() == r'\seen' || f.toLowerCase() == r'\\seen',
|
||||
)) {
|
||||
return MarkAsSeenAction();
|
||||
}
|
||||
return FlagAction(flags);
|
||||
}
|
||||
if (word == 'mark') {
|
||||
s.readWord();
|
||||
s.skipWhitespaceAndComments();
|
||||
s.expectChar(';');
|
||||
return MarkAsSeenAction();
|
||||
}
|
||||
return null;
|
||||
}
|
||||
}
|
||||
|
||||
// ---------------------------------------------------------------------------
|
||||
// Low-level scanner
|
||||
// ---------------------------------------------------------------------------
|
||||
|
||||
class SieveParseException implements Exception {
|
||||
SieveParseException(this.message);
|
||||
final String message;
|
||||
@override
|
||||
String toString() => 'SieveParseException: $message';
|
||||
}
|
||||
|
||||
class _Scanner {
|
||||
_Scanner(this._src);
|
||||
|
||||
final String _src;
|
||||
int _pos = 0;
|
||||
|
||||
int get position => _pos;
|
||||
bool get isAtEnd => _pos >= _src.length;
|
||||
String get remaining => _pos < _src.length ? _src.substring(_pos) : '';
|
||||
|
||||
String? peek() {
|
||||
if (isAtEnd) return null;
|
||||
return _src[_pos];
|
||||
}
|
||||
|
||||
String advance() {
|
||||
if (isAtEnd) throw SieveParseException('Unexpected end of input');
|
||||
return _src[_pos++];
|
||||
}
|
||||
|
||||
void skipWhitespaceAndComments() {
|
||||
while (!isAtEnd) {
|
||||
final ch = _src[_pos];
|
||||
if (ch == ' ' || ch == '\t' || ch == '\r' || ch == '\n') {
|
||||
_pos++;
|
||||
} else if (ch == '#') {
|
||||
// Line comment — skip to end of line.
|
||||
while (!isAtEnd && _src[_pos] != '\n') {
|
||||
_pos++;
|
||||
}
|
||||
} else if (_pos + 1 < _src.length && ch == '/' && _src[_pos + 1] == '*') {
|
||||
// Block comment.
|
||||
_pos += 2;
|
||||
while (_pos + 1 < _src.length) {
|
||||
if (_src[_pos] == '*' && _src[_pos + 1] == '/') {
|
||||
_pos += 2;
|
||||
break;
|
||||
}
|
||||
_pos++;
|
||||
}
|
||||
} else {
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/// Peeks at the next word-like token (letters/digits/underscores/colons for
|
||||
/// tagged args, and special single-char tokens like `{`, `}`, `;`).
|
||||
String? peekWord() {
|
||||
if (isAtEnd) return null;
|
||||
final ch = _src[_pos];
|
||||
if ('{}();[],'.contains(ch)) return ch;
|
||||
if (ch == ':') {
|
||||
// Tagged arg like :contains
|
||||
final start = _pos;
|
||||
var end = _pos + 1;
|
||||
while (end < _src.length && _isWordChar(_src[end])) {
|
||||
end++;
|
||||
}
|
||||
return _src.substring(start, end).toLowerCase();
|
||||
}
|
||||
if (_isWordChar(ch)) {
|
||||
final start = _pos;
|
||||
var end = _pos + 1;
|
||||
while (
|
||||
end < _src.length && (_isWordChar(_src[end]) || _src[end] == ':')) {
|
||||
// Include trailing colon for "text:" multiline token.
|
||||
if (_src[end] == ':') {
|
||||
end++;
|
||||
break;
|
||||
}
|
||||
end++;
|
||||
}
|
||||
return _src.substring(start, end).toLowerCase();
|
||||
}
|
||||
return null;
|
||||
}
|
||||
|
||||
String readWord() {
|
||||
final start = _pos;
|
||||
final ch = _src[_pos];
|
||||
if ('{}();[],'.contains(ch)) {
|
||||
_pos++;
|
||||
return ch;
|
||||
}
|
||||
if (ch == ':') {
|
||||
_pos++;
|
||||
while (!isAtEnd && _isWordChar(_src[_pos])) {
|
||||
_pos++;
|
||||
}
|
||||
} else {
|
||||
while (!isAtEnd && (_isWordChar(_src[_pos]) || _src[_pos] == ':')) {
|
||||
if (_src[_pos] == ':') {
|
||||
_pos++;
|
||||
break;
|
||||
}
|
||||
_pos++;
|
||||
}
|
||||
}
|
||||
return _src.substring(start, _pos).toLowerCase();
|
||||
}
|
||||
|
||||
String? peekTaggedArg() {
|
||||
if (!isAtEnd && _src[_pos] == ':') return peekWord();
|
||||
return null;
|
||||
}
|
||||
|
||||
String readTaggedArg() {
|
||||
if (!isAtEnd && _src[_pos] == ':') return readWord();
|
||||
throw SieveParseException(
|
||||
'Expected tagged argument at position $_pos',
|
||||
);
|
||||
}
|
||||
|
||||
String? peekSizeUnit() {
|
||||
if (isAtEnd) return null;
|
||||
final ch = _src[_pos].toUpperCase();
|
||||
if (ch == 'K' || ch == 'M' || ch == 'G') return ch;
|
||||
return null;
|
||||
}
|
||||
|
||||
String readDigits() {
|
||||
if (isAtEnd || !_isDigit(_src[_pos])) {
|
||||
throw SieveParseException(
|
||||
'Expected number at position $_pos',
|
||||
);
|
||||
}
|
||||
final start = _pos;
|
||||
while (!isAtEnd && _isDigit(_src[_pos])) {
|
||||
_pos++;
|
||||
}
|
||||
return _src.substring(start, _pos);
|
||||
}
|
||||
|
||||
String readQuotedString() {
|
||||
if (_src[_pos] != '"') {
|
||||
throw SieveParseException(
|
||||
'Expected " at position $_pos',
|
||||
);
|
||||
}
|
||||
_pos++; // skip opening quote
|
||||
final buf = StringBuffer();
|
||||
while (!isAtEnd) {
|
||||
final ch = _src[_pos];
|
||||
if (ch == '"') {
|
||||
_pos++;
|
||||
return buf.toString();
|
||||
}
|
||||
if (ch == '\\' && _pos + 1 < _src.length) {
|
||||
_pos++;
|
||||
buf.write(_src[_pos]);
|
||||
_pos++;
|
||||
} else {
|
||||
buf.write(ch);
|
||||
_pos++;
|
||||
}
|
||||
}
|
||||
throw SieveParseException('Unterminated string');
|
||||
}
|
||||
|
||||
/// Parses a `text:` multi-line block (RFC 5228 §2.4.2).
|
||||
/// Format: `text:\r\n<lines>\r\n.\r\n`
|
||||
String readTextBlock() {
|
||||
// Consume "text:"
|
||||
while (!isAtEnd && _src[_pos] != ':') {
|
||||
_pos++;
|
||||
}
|
||||
if (!isAtEnd) _pos++; // skip ':'
|
||||
// Skip optional whitespace then newline.
|
||||
while (!isAtEnd && (_src[_pos] == ' ' || _src[_pos] == '\t')) {
|
||||
_pos++;
|
||||
}
|
||||
if (!isAtEnd && _src[_pos] == '\r') _pos++;
|
||||
if (!isAtEnd && _src[_pos] == '\n') _pos++;
|
||||
final buf = StringBuffer();
|
||||
while (!isAtEnd) {
|
||||
// Check for terminator: a lone "." on its own line.
|
||||
if (_src[_pos] == '.' &&
|
||||
(_pos + 1 >= _src.length ||
|
||||
_src[_pos + 1] == '\r' ||
|
||||
_src[_pos + 1] == '\n')) {
|
||||
_pos++;
|
||||
if (!isAtEnd && _src[_pos] == '\r') _pos++;
|
||||
if (!isAtEnd && _src[_pos] == '\n') _pos++;
|
||||
break;
|
||||
}
|
||||
buf.write(_src[_pos]);
|
||||
_pos++;
|
||||
}
|
||||
return buf.toString();
|
||||
}
|
||||
|
||||
void expectChar(String ch) {
|
||||
skipWhitespaceAndComments();
|
||||
if (isAtEnd || _src[_pos] != ch) {
|
||||
throw SieveParseException(
|
||||
'Expected "$ch" at position $_pos, got '
|
||||
'"${isAtEnd ? "EOF" : _src[_pos]}"',
|
||||
);
|
||||
}
|
||||
_pos++;
|
||||
}
|
||||
|
||||
void expectWord(String word) {
|
||||
skipWhitespaceAndComments();
|
||||
final got = readWord();
|
||||
if (got.toLowerCase() != word.toLowerCase()) {
|
||||
throw SieveParseException(
|
||||
'Expected "$word" at position $_pos, got "$got"',
|
||||
);
|
||||
}
|
||||
}
|
||||
|
||||
void skipToNextSemicolon() {
|
||||
while (!isAtEnd && _src[_pos] != ';') {
|
||||
_pos++;
|
||||
}
|
||||
if (!isAtEnd) _pos++; // skip ';'
|
||||
}
|
||||
|
||||
static bool _isWordChar(String ch) {
|
||||
final c = ch.codeUnitAt(0);
|
||||
return (c >= 0x41 && c <= 0x5A) || // A-Z
|
||||
(c >= 0x61 && c <= 0x7A) || // a-z
|
||||
(c >= 0x30 && c <= 0x39) || // 0-9
|
||||
c == 0x5F || // _
|
||||
c == 0x2D; // -
|
||||
}
|
||||
|
||||
static bool _isDigit(String ch) {
|
||||
final c = ch.codeUnitAt(0);
|
||||
return c >= 0x30 && c <= 0x39;
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,21 @@
|
||||
import 'package:sharedinbox/core/sieve/sieve_actions.dart';
|
||||
import 'package:sharedinbox/core/sieve/sieve_conditions.dart';
|
||||
|
||||
class SieveRule {
|
||||
const SieveRule({
|
||||
required this.joinType,
|
||||
required this.conditions,
|
||||
required this.actions,
|
||||
this.branchGroupId,
|
||||
this.isElseBranch = false,
|
||||
});
|
||||
|
||||
// 'allof', 'anyof', or 'single'
|
||||
final String joinType;
|
||||
final List<SieveCondition> conditions;
|
||||
final List<SieveAction> actions;
|
||||
// Non-null groups this rule into an if/elsif/else chain.
|
||||
final int? branchGroupId;
|
||||
// True for the unconditional else branch.
|
||||
final bool isElseBranch;
|
||||
}
|
||||
@@ -0,0 +1,343 @@
|
||||
import 'package:flutter_test/flutter_test.dart';
|
||||
import 'package:sharedinbox/core/sieve/sieve_actions.dart';
|
||||
import 'package:sharedinbox/core/sieve/sieve_conditions.dart';
|
||||
import 'package:sharedinbox/core/sieve/sieve_interpreter.dart';
|
||||
import 'package:sharedinbox/core/sieve/sieve_rule.dart';
|
||||
|
||||
SieveEmailContext _email({
|
||||
String subject = '',
|
||||
String from = '',
|
||||
String to = '',
|
||||
int size = 0,
|
||||
Map<String, List<String>> extra = const {},
|
||||
}) {
|
||||
return SieveEmailContext(
|
||||
headers: {
|
||||
if (subject.isNotEmpty) 'subject': [subject],
|
||||
if (from.isNotEmpty) 'from': [from],
|
||||
if (to.isNotEmpty) 'to': [to],
|
||||
...extra,
|
||||
},
|
||||
sizeBytes: size,
|
||||
);
|
||||
}
|
||||
|
||||
void main() {
|
||||
final interp = SieveInterpreter();
|
||||
|
||||
group('SieveInterpreter — no rules', () {
|
||||
test('empty rule list keeps inbox', () {
|
||||
final ctx = interp.execute([], _email());
|
||||
expect(ctx.keepInInbox, isTrue);
|
||||
expect(ctx.isCancelled, isFalse);
|
||||
});
|
||||
});
|
||||
|
||||
group('HeaderCondition :contains', () {
|
||||
test('matches subject substring (case-insensitive)', () {
|
||||
final rules = [
|
||||
SieveRule(
|
||||
joinType: 'single',
|
||||
conditions: [
|
||||
HeaderCondition(['subject'], ':contains', ['spam']),
|
||||
],
|
||||
actions: [DiscardAction()],
|
||||
),
|
||||
];
|
||||
|
||||
final ctx = interp.execute(rules, _email(subject: 'This is SPAM!'));
|
||||
expect(ctx.isCancelled, isTrue);
|
||||
expect(ctx.keepInInbox, isFalse);
|
||||
});
|
||||
|
||||
test('does not match unrelated subject', () {
|
||||
final rules = [
|
||||
SieveRule(
|
||||
joinType: 'single',
|
||||
conditions: [
|
||||
HeaderCondition(['subject'], ':contains', ['spam']),
|
||||
],
|
||||
actions: [DiscardAction()],
|
||||
),
|
||||
];
|
||||
|
||||
final ctx = interp.execute(rules, _email(subject: 'Meeting tomorrow'));
|
||||
expect(ctx.isCancelled, isFalse);
|
||||
expect(ctx.keepInInbox, isTrue);
|
||||
});
|
||||
});
|
||||
|
||||
group('HeaderCondition :is', () {
|
||||
test('exact match on from header', () {
|
||||
final rules = [
|
||||
SieveRule(
|
||||
joinType: 'single',
|
||||
conditions: [
|
||||
HeaderCondition(
|
||||
['from', 'reply-to'],
|
||||
':is',
|
||||
['boss@work.com'],
|
||||
),
|
||||
],
|
||||
actions: [
|
||||
FlagAction([r'\Important']),
|
||||
FileIntoAction('Work'),
|
||||
],
|
||||
),
|
||||
];
|
||||
|
||||
final ctx = interp.execute(rules, _email(from: 'boss@work.com'));
|
||||
expect(ctx.flagsToAdd, contains(r'\Important'));
|
||||
expect(ctx.targetFolders, contains('Work'));
|
||||
expect(ctx.keepInInbox, isFalse);
|
||||
});
|
||||
|
||||
test('does not match partial from address', () {
|
||||
final rules = [
|
||||
SieveRule(
|
||||
joinType: 'single',
|
||||
conditions: [
|
||||
HeaderCondition(['from'], ':is', ['boss@work.com']),
|
||||
],
|
||||
actions: [FileIntoAction('Work')],
|
||||
),
|
||||
];
|
||||
|
||||
final ctx = interp.execute(rules, _email(from: 'other-boss@work.com'));
|
||||
expect(ctx.targetFolders, isEmpty);
|
||||
expect(ctx.keepInInbox, isTrue);
|
||||
});
|
||||
});
|
||||
|
||||
group('HeaderCondition :matches (glob)', () {
|
||||
test('* matches any substring', () {
|
||||
final rules = [
|
||||
SieveRule(
|
||||
joinType: 'single',
|
||||
conditions: [
|
||||
HeaderCondition(['subject'], ':matches', ['*newsletter*']),
|
||||
],
|
||||
actions: [FileIntoAction('Bulk')],
|
||||
),
|
||||
];
|
||||
|
||||
final ctx =
|
||||
interp.execute(rules, _email(subject: 'Weekly Newsletter Issue'));
|
||||
expect(ctx.targetFolders, contains('Bulk'));
|
||||
});
|
||||
});
|
||||
|
||||
group('SizeCondition', () {
|
||||
test(':over threshold fires', () {
|
||||
final rules = [
|
||||
SieveRule(
|
||||
joinType: 'single',
|
||||
conditions: [SizeCondition(':over', 1024)],
|
||||
actions: [FileIntoAction('Large')],
|
||||
),
|
||||
];
|
||||
final ctx = interp.execute(rules, _email(size: 2048));
|
||||
expect(ctx.targetFolders, contains('Large'));
|
||||
});
|
||||
|
||||
test(':under threshold fires', () {
|
||||
final rules = [
|
||||
SieveRule(
|
||||
joinType: 'single',
|
||||
conditions: [SizeCondition(':under', 500)],
|
||||
actions: [FileIntoAction('Small')],
|
||||
),
|
||||
];
|
||||
final ctx = interp.execute(rules, _email(size: 100));
|
||||
expect(ctx.targetFolders, contains('Small'));
|
||||
});
|
||||
|
||||
test(':over threshold does not fire when size equals threshold', () {
|
||||
final rules = [
|
||||
SieveRule(
|
||||
joinType: 'single',
|
||||
conditions: [SizeCondition(':over', 1024)],
|
||||
actions: [DiscardAction()],
|
||||
),
|
||||
];
|
||||
final ctx = interp.execute(rules, _email(size: 1024));
|
||||
expect(ctx.isCancelled, isFalse);
|
||||
});
|
||||
});
|
||||
|
||||
group('allof / anyof join types', () {
|
||||
test('allof fires only when all conditions match', () {
|
||||
final rules = [
|
||||
SieveRule(
|
||||
joinType: 'allof',
|
||||
conditions: [
|
||||
HeaderCondition(['subject'], ':contains', ['deal']),
|
||||
HeaderCondition(['from'], ':contains', ['shop.com']),
|
||||
],
|
||||
actions: [FileIntoAction('Deals')],
|
||||
),
|
||||
];
|
||||
|
||||
// Both match.
|
||||
var ctx = interp.execute(
|
||||
rules,
|
||||
_email(subject: 'Big deal today', from: 'offers@shop.com'),
|
||||
);
|
||||
expect(ctx.targetFolders, contains('Deals'));
|
||||
|
||||
// Only subject matches.
|
||||
ctx = interp.execute(
|
||||
rules,
|
||||
_email(subject: 'Big deal today', from: 'friend@example.com'),
|
||||
);
|
||||
expect(ctx.targetFolders, isEmpty);
|
||||
});
|
||||
|
||||
test('anyof fires when any condition matches', () {
|
||||
final rules = [
|
||||
SieveRule(
|
||||
joinType: 'anyof',
|
||||
conditions: [
|
||||
HeaderCondition(['subject'], ':contains', ['spam']),
|
||||
HeaderCondition(['subject'], ':contains', ['advertisement']),
|
||||
],
|
||||
actions: [DiscardAction()],
|
||||
),
|
||||
];
|
||||
|
||||
final ctx = interp.execute(rules, _email(subject: 'Huge advertisement!'));
|
||||
expect(ctx.isCancelled, isTrue);
|
||||
});
|
||||
});
|
||||
|
||||
group('discard stops processing', () {
|
||||
test('rules after discard are skipped', () {
|
||||
final rules = [
|
||||
SieveRule(
|
||||
joinType: 'single',
|
||||
conditions: [
|
||||
HeaderCondition(['subject'], ':contains', ['spam']),
|
||||
],
|
||||
actions: [DiscardAction()],
|
||||
),
|
||||
SieveRule(
|
||||
joinType: 'single',
|
||||
conditions: const [],
|
||||
actions: [FileIntoAction('Inbox')],
|
||||
),
|
||||
];
|
||||
|
||||
final ctx = interp.execute(rules, _email(subject: 'Spam'));
|
||||
expect(ctx.isCancelled, isTrue);
|
||||
expect(ctx.targetFolders, isEmpty);
|
||||
});
|
||||
});
|
||||
|
||||
group('MarkAsSeenAction', () {
|
||||
test('adds \\Seen flag', () {
|
||||
final rules = [
|
||||
SieveRule(
|
||||
joinType: 'single',
|
||||
conditions: const [],
|
||||
actions: [MarkAsSeenAction()],
|
||||
),
|
||||
];
|
||||
final ctx = interp.execute(rules, _email());
|
||||
expect(ctx.flagsToAdd, contains(r'\Seen'));
|
||||
});
|
||||
});
|
||||
|
||||
group('if/elsif/else branch groups', () {
|
||||
final rules = [
|
||||
SieveRule(
|
||||
joinType: 'single',
|
||||
conditions: [
|
||||
HeaderCondition(['subject'], ':contains', ['spam']),
|
||||
],
|
||||
actions: [DiscardAction()],
|
||||
branchGroupId: 1,
|
||||
),
|
||||
SieveRule(
|
||||
joinType: 'single',
|
||||
conditions: [
|
||||
HeaderCondition(['subject'], ':contains', ['work']),
|
||||
],
|
||||
actions: [FileIntoAction('Work')],
|
||||
branchGroupId: 1,
|
||||
),
|
||||
SieveRule(
|
||||
joinType: 'single',
|
||||
conditions: const [],
|
||||
actions: [KeepAction()],
|
||||
branchGroupId: 1,
|
||||
isElseBranch: true,
|
||||
),
|
||||
];
|
||||
|
||||
test('first branch fires, subsequent branches are skipped', () {
|
||||
final ctx = interp.execute(rules, _email(subject: 'spam message'));
|
||||
expect(ctx.isCancelled, isTrue);
|
||||
expect(ctx.targetFolders, isEmpty);
|
||||
});
|
||||
|
||||
test('second branch fires when first does not match', () {
|
||||
final ctx = interp.execute(rules, _email(subject: 'Work update'));
|
||||
expect(ctx.isCancelled, isFalse);
|
||||
expect(ctx.targetFolders, contains('Work'));
|
||||
});
|
||||
|
||||
test('else branch fires when no branch matched', () {
|
||||
final ctx = interp.execute(rules, _email(subject: 'Hello'));
|
||||
expect(ctx.isCancelled, isFalse);
|
||||
expect(ctx.targetFolders, isEmpty);
|
||||
expect(ctx.keepInInbox, isTrue);
|
||||
});
|
||||
});
|
||||
|
||||
group('multiple independent rules', () {
|
||||
test('both rules fire when conditions match', () {
|
||||
final rules = [
|
||||
SieveRule(
|
||||
joinType: 'single',
|
||||
conditions: [
|
||||
HeaderCondition(['subject'], ':contains', ['invoice']),
|
||||
],
|
||||
actions: [FileIntoAction('Finance')],
|
||||
),
|
||||
SieveRule(
|
||||
joinType: 'single',
|
||||
conditions: [
|
||||
HeaderCondition(['from'], ':contains', ['boss@']),
|
||||
],
|
||||
actions: [
|
||||
FlagAction([r'\Important']),
|
||||
],
|
||||
),
|
||||
];
|
||||
|
||||
final ctx = interp.execute(
|
||||
rules,
|
||||
_email(subject: 'Invoice #123', from: 'boss@corp.com'),
|
||||
);
|
||||
expect(ctx.targetFolders, contains('Finance'));
|
||||
expect(ctx.flagsToAdd, contains(r'\Important'));
|
||||
});
|
||||
});
|
||||
|
||||
group('implicit keep', () {
|
||||
test('keepInInbox stays true when no action changes routing', () {
|
||||
final rules = [
|
||||
SieveRule(
|
||||
joinType: 'single',
|
||||
conditions: [
|
||||
HeaderCondition(['subject'], ':contains', ['nope']),
|
||||
],
|
||||
actions: [DiscardAction()],
|
||||
),
|
||||
];
|
||||
final ctx = interp.execute(rules, _email(subject: 'Hi there'));
|
||||
expect(ctx.keepInInbox, isTrue);
|
||||
expect(ctx.isCancelled, isFalse);
|
||||
});
|
||||
});
|
||||
}
|
||||
@@ -0,0 +1,305 @@
|
||||
import 'package:flutter_test/flutter_test.dart';
|
||||
import 'package:sharedinbox/core/sieve/sieve_actions.dart';
|
||||
import 'package:sharedinbox/core/sieve/sieve_conditions.dart';
|
||||
import 'package:sharedinbox/core/sieve/sieve_interpreter.dart';
|
||||
import 'package:sharedinbox/core/sieve/sieve_parser.dart';
|
||||
|
||||
SieveEmailContext _email({
|
||||
String subject = '',
|
||||
String from = '',
|
||||
String to = '',
|
||||
int size = 0,
|
||||
}) {
|
||||
return SieveEmailContext(
|
||||
headers: {
|
||||
if (subject.isNotEmpty) 'subject': [subject],
|
||||
if (from.isNotEmpty) 'from': [from],
|
||||
if (to.isNotEmpty) 'to': [to],
|
||||
},
|
||||
sizeBytes: size,
|
||||
);
|
||||
}
|
||||
|
||||
void main() {
|
||||
final parser = SieveParser();
|
||||
final interp = SieveInterpreter();
|
||||
|
||||
SieveExecutionContext run(String script, SieveEmailContext email) {
|
||||
return interp.execute(parser.parse(script), email);
|
||||
}
|
||||
|
||||
group('SieveParser — require', () {
|
||||
test('require is parsed without error', () {
|
||||
expect(
|
||||
() => parser.parse('require ["fileinto", "imap4flags"];'),
|
||||
returnsNormally,
|
||||
);
|
||||
});
|
||||
|
||||
test('require produces no rules', () {
|
||||
final rules = parser.parse('require ["fileinto"];');
|
||||
expect(rules, isEmpty);
|
||||
});
|
||||
});
|
||||
|
||||
group('SieveParser — basic if/discard', () {
|
||||
test('discard on subject :contains', () {
|
||||
const script = '''
|
||||
require ["fileinto"];
|
||||
if header :contains "Subject" "Spam" {
|
||||
discard;
|
||||
}
|
||||
''';
|
||||
var ctx = run(script, _email(subject: 'This is Spam!'));
|
||||
expect(ctx.isCancelled, isTrue);
|
||||
|
||||
ctx = run(script, _email(subject: 'Hello'));
|
||||
expect(ctx.isCancelled, isFalse);
|
||||
});
|
||||
});
|
||||
|
||||
group('SieveParser — fileinto + flag', () {
|
||||
test('flag and fileinto on :is match across multiple headers', () {
|
||||
const script = '''
|
||||
require ["fileinto", "imap4flags"];
|
||||
if header :is ["From", "Reply-To"] "boss@work.com" {
|
||||
flag ["\\\\Important"];
|
||||
fileinto "Work";
|
||||
}
|
||||
''';
|
||||
final ctx = run(script, _email(from: 'boss@work.com'));
|
||||
expect(ctx.targetFolders, contains('Work'));
|
||||
expect(ctx.keepInInbox, isFalse);
|
||||
});
|
||||
|
||||
test('no match means inbox is kept', () {
|
||||
const script = '''
|
||||
if header :is "From" "boss@work.com" {
|
||||
fileinto "Work";
|
||||
}
|
||||
''';
|
||||
final ctx = run(script, _email(from: 'other@example.com'));
|
||||
expect(ctx.targetFolders, isEmpty);
|
||||
expect(ctx.keepInInbox, isTrue);
|
||||
});
|
||||
});
|
||||
|
||||
group('SieveParser — anyof', () {
|
||||
test('anyof fires when any sub-condition matches', () {
|
||||
const script = '''
|
||||
if anyof (
|
||||
header :contains "Subject" "Newsletter",
|
||||
header :contains "Subject" "Promotion"
|
||||
) {
|
||||
fileinto "Bulk";
|
||||
}
|
||||
''';
|
||||
var ctx = run(script, _email(subject: 'Weekly Newsletter'));
|
||||
expect(ctx.targetFolders, contains('Bulk'));
|
||||
|
||||
ctx = run(script, _email(subject: 'Big Promotion Inside'));
|
||||
expect(ctx.targetFolders, contains('Bulk'));
|
||||
|
||||
ctx = run(script, _email(subject: 'Normal message'));
|
||||
expect(ctx.targetFolders, isEmpty);
|
||||
});
|
||||
});
|
||||
|
||||
group('SieveParser — allof', () {
|
||||
test('allof fires only when all conditions match', () {
|
||||
const script = '''
|
||||
if allof (
|
||||
header :contains "From" "shop.com",
|
||||
header :contains "Subject" "deal"
|
||||
) {
|
||||
fileinto "Deals";
|
||||
}
|
||||
''';
|
||||
var ctx = run(
|
||||
script,
|
||||
_email(from: 'offers@shop.com', subject: 'Hot deal today'),
|
||||
);
|
||||
expect(ctx.targetFolders, contains('Deals'));
|
||||
|
||||
ctx = run(
|
||||
script,
|
||||
_email(from: 'friend@example.com', subject: 'Hot deal today'),
|
||||
);
|
||||
expect(ctx.targetFolders, isEmpty);
|
||||
});
|
||||
});
|
||||
|
||||
group('SieveParser — size condition', () {
|
||||
test(':over with K suffix', () {
|
||||
const script = '''
|
||||
if size :over 100K {
|
||||
fileinto "Large";
|
||||
}
|
||||
''';
|
||||
var ctx = run(script, _email(size: 200 * 1024));
|
||||
expect(ctx.targetFolders, contains('Large'));
|
||||
|
||||
ctx = run(script, _email(size: 50 * 1024));
|
||||
expect(ctx.targetFolders, isEmpty);
|
||||
});
|
||||
|
||||
test(':under fires for small messages', () {
|
||||
const script = '''
|
||||
if size :under 1K {
|
||||
fileinto "Tiny";
|
||||
}
|
||||
''';
|
||||
final ctx = run(script, _email(size: 500));
|
||||
expect(ctx.targetFolders, contains('Tiny'));
|
||||
});
|
||||
});
|
||||
|
||||
group('SieveParser — if/elsif/else', () {
|
||||
const script = '''
|
||||
if header :contains "Subject" "Spam" {
|
||||
discard;
|
||||
} elsif header :contains "Subject" "Work" {
|
||||
fileinto "Work";
|
||||
} else {
|
||||
keep;
|
||||
}
|
||||
''';
|
||||
|
||||
test('if branch fires', () {
|
||||
final ctx = run(script, _email(subject: 'Spam message'));
|
||||
expect(ctx.isCancelled, isTrue);
|
||||
});
|
||||
|
||||
test('elsif branch fires when if does not match', () {
|
||||
final ctx = run(script, _email(subject: 'Work update'));
|
||||
expect(ctx.isCancelled, isFalse);
|
||||
expect(ctx.targetFolders, contains('Work'));
|
||||
});
|
||||
|
||||
test('else branch fires when no condition matched', () {
|
||||
final ctx = run(script, _email(subject: 'Hello'));
|
||||
expect(ctx.isCancelled, isFalse);
|
||||
expect(ctx.targetFolders, isEmpty);
|
||||
expect(ctx.keepInInbox, isTrue);
|
||||
});
|
||||
});
|
||||
|
||||
group('SieveParser — multiple independent if blocks', () {
|
||||
test('both fire independently', () {
|
||||
const script = '''
|
||||
if header :contains "Subject" "invoice" {
|
||||
fileinto "Finance";
|
||||
}
|
||||
if header :contains "From" "boss@" {
|
||||
flag ["\\\\Important"];
|
||||
}
|
||||
''';
|
||||
final ctx = run(
|
||||
script,
|
||||
_email(subject: 'Invoice #42', from: 'boss@corp.com'),
|
||||
);
|
||||
expect(ctx.targetFolders, contains('Finance'));
|
||||
expect(ctx.flagsToAdd, contains(r'\Important'));
|
||||
});
|
||||
});
|
||||
|
||||
group('SieveParser — keep and stop', () {
|
||||
test('keep action keeps inbox', () {
|
||||
const script = 'keep;';
|
||||
final ctx = run(script, _email());
|
||||
expect(ctx.keepInInbox, isTrue);
|
||||
expect(ctx.isCancelled, isFalse);
|
||||
});
|
||||
|
||||
test('stop acts as implicit keep', () {
|
||||
const script = 'stop;';
|
||||
final ctx = run(script, _email());
|
||||
expect(ctx.keepInInbox, isTrue);
|
||||
});
|
||||
});
|
||||
|
||||
group('SieveParser — comments', () {
|
||||
test('line comments are ignored', () {
|
||||
const script = '''
|
||||
# This is a comment
|
||||
if header :contains "Subject" "Spam" {
|
||||
discard; # inline comment
|
||||
}
|
||||
''';
|
||||
final ctx = run(script, _email(subject: 'Spam'));
|
||||
expect(ctx.isCancelled, isTrue);
|
||||
});
|
||||
|
||||
test('block comments are ignored', () {
|
||||
const script = '''
|
||||
/* block comment */
|
||||
if /* inline block */ header :contains "Subject" "Spam" {
|
||||
discard;
|
||||
}
|
||||
''';
|
||||
final ctx = run(script, _email(subject: 'Spam'));
|
||||
expect(ctx.isCancelled, isTrue);
|
||||
});
|
||||
});
|
||||
|
||||
group('SieveParser — exists test', () {
|
||||
test('exists fires when header is present and non-empty', () {
|
||||
const script = '''
|
||||
if exists "X-Spam-Flag" {
|
||||
discard;
|
||||
}
|
||||
''';
|
||||
const email = SieveEmailContext(
|
||||
headers: {
|
||||
'x-spam-flag': ['YES'],
|
||||
},
|
||||
);
|
||||
final ctx = interp.execute(parser.parse(script), email);
|
||||
expect(ctx.isCancelled, isTrue);
|
||||
});
|
||||
});
|
||||
|
||||
group('SieveParser — rule model', () {
|
||||
test('simple if produces one rule with branchGroupId', () {
|
||||
final rules =
|
||||
parser.parse('if header :contains "Subject" "x" { discard; }');
|
||||
expect(rules, hasLength(1));
|
||||
expect(rules.first.branchGroupId, isNotNull);
|
||||
expect(rules.first.conditions, hasLength(1));
|
||||
expect(rules.first.actions, hasLength(1));
|
||||
expect(rules.first.actions.first, isA<DiscardAction>());
|
||||
});
|
||||
|
||||
test('if/elsif produces two rules with the same branchGroupId', () {
|
||||
const script = '''
|
||||
if header :contains "Subject" "a" { discard; }
|
||||
elsif header :contains "Subject" "b" { keep; }
|
||||
''';
|
||||
final rules = parser.parse(script);
|
||||
expect(rules, hasLength(2));
|
||||
expect(rules[0].branchGroupId, equals(rules[1].branchGroupId));
|
||||
expect(rules[0].isElseBranch, isFalse);
|
||||
expect(rules[1].isElseBranch, isFalse);
|
||||
});
|
||||
|
||||
test('else rule has isElseBranch=true', () {
|
||||
const script = '''
|
||||
if header :contains "Subject" "a" { discard; }
|
||||
else { keep; }
|
||||
''';
|
||||
final rules = parser.parse(script);
|
||||
expect(rules, hasLength(2));
|
||||
expect(rules.last.isElseBranch, isTrue);
|
||||
});
|
||||
|
||||
test('HeaderCondition fields are populated', () {
|
||||
final rules = parser.parse(
|
||||
'if header :contains ["From","Reply-To"] "x@y.com" { keep; }',
|
||||
);
|
||||
final cond = rules.first.conditions.first as HeaderCondition;
|
||||
expect(cond.headers, containsAll(['From', 'Reply-To']));
|
||||
expect(cond.matchType, ':contains');
|
||||
expect(cond.keyList, contains('x@y.com'));
|
||||
});
|
||||
});
|
||||
}
|
||||
Reference in New Issue
Block a user