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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.hosted.controller.restapi.user;
import com.yahoo.config.provision.TenantName;
import com.yahoo.lang.MutableBoolean;
import com.yahoo.slime.Cursor;
import com.yahoo.slime.SlimeUtils;
import com.yahoo.vespa.flags.FetchVector;
import com.yahoo.vespa.flags.FlagDefinition;
import com.yahoo.vespa.flags.FlagId;
import com.yahoo.vespa.flags.Flags;
import com.yahoo.vespa.flags.RawFlag;
import com.yahoo.vespa.flags.UnboundFlag;
import com.yahoo.vespa.flags.json.Condition;
import com.yahoo.vespa.flags.json.FlagData;
import com.yahoo.vespa.flags.json.Rule;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.Set;
import java.util.function.Predicate;
import java.util.stream.Collectors;
import java.util.stream.Stream;
/**
* @author freva
*/
public class UserFlagsSerializer {
static void toSlime(Cursor cursor, Map<FlagId, FlagData> rawFlagData,
Set<TenantName> authorizedForTenantNames, boolean isOperator, String userEmail) {
FetchVector resolveVector = FetchVector.fromMap(Map.of(FetchVector.Dimension.CONSOLE_USER_EMAIL, userEmail));
List<FlagData> filteredFlagData = Flags.getAllFlags().stream()
// Only include flags that have CONSOLE_USER_EMAIL dimension, this should be replaced with more explicit
// 'target' annotation if/when that is added to flag definition
.filter(fd -> fd.getDimensions().contains(FetchVector.Dimension.CONSOLE_USER_EMAIL))
.map(FlagDefinition::getUnboundFlag)
.map(flag -> filteredFlagData(flag, Optional.ofNullable(rawFlagData.get(flag.id())), authorizedForTenantNames, isOperator, resolveVector))
.collect(Collectors.toUnmodifiableList());
byte[] bytes = FlagData.serializeListToUtf8Json(filteredFlagData);
SlimeUtils.copyObject(SlimeUtils.jsonToSlime(bytes).get(), cursor);
}
private static <T> FlagData filteredFlagData(UnboundFlag<T, ?, ?> definition, Optional<FlagData> original,
Set<TenantName> authorizedForTenantNames, boolean isOperator, FetchVector resolveVector) {
MutableBoolean encounteredEmpty = new MutableBoolean(false);
Optional<RawFlag> defaultValue = Optional.of(definition.serializer().serialize(definition.defaultValue()));
// Include the original rules from flag DB and the default value from code if there is no default rule in DB
List<Rule> rules = Stream.concat(original.stream().flatMap(fd -> fd.rules().stream()), Stream.of(new Rule(defaultValue)))
// Exclude rules that do not match the resolveVector
.filter(rule -> rule.partialMatch(resolveVector))
// Re-create each rule with value explicitly set, either from DB or default from code and
// a filtered set of conditions
.map(rule -> new Rule(rule.getValueToApply().or(() -> defaultValue),
rule.conditions().stream()
.flatMap(condition -> filteredCondition(condition, authorizedForTenantNames, isOperator, resolveVector).stream())
.collect(Collectors.toUnmodifiableList())))
// We can stop as soon as we hit the first rule that has no conditions
.takeWhile(rule -> !encounteredEmpty.getAndSet(rule.conditions().isEmpty()))
.collect(Collectors.toUnmodifiableList());
return new FlagData(definition.id(), new FetchVector(), rules);
}
private static Optional<Condition> filteredCondition(Condition condition, Set<TenantName> authorizedForTenantNames,
boolean isOperator, FetchVector resolveVector) {
// If the condition is one of the conditions that we resolve on the server, e.g. email, we do not need to
// propagate it back to the user
if (resolveVector.hasDimension(condition.dimension())) return Optional.empty();
// For the other dimensions, filter the values down to an allowed subset
switch (condition.dimension()) {
case TENANT_ID: return valueSubset(condition, tenant -> isOperator || authorizedForTenantNames.contains(TenantName.from(tenant)));
case APPLICATION_ID: return valueSubset(condition, appId -> isOperator || authorizedForTenantNames.stream().anyMatch(tenant -> appId.startsWith(tenant.value() + ":")));
default: throw new IllegalArgumentException("Dimension " + condition.dimension() + " is not supported for user flags");
}
}
private static Optional<Condition> valueSubset(Condition condition, Predicate<String> predicate) {
Condition.CreateParams createParams = condition.toCreateParams();
return Optional.of(createParams
.withValues(createParams.values().stream().filter(predicate).collect(Collectors.toUnmodifiableList()))
.createAs(condition.type()));
}
}
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