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org.zalando.riptide.DefaultRequestArguments Maven / Gradle / Ivy
package org.zalando.riptide;
import lombok.AccessLevel;
import lombok.AllArgsConstructor;
import lombok.Getter;
import lombok.Singular;
import lombok.experimental.FieldDefaults;
import lombok.experimental.Wither;
import org.apiguardian.api.API;
import org.organicdesign.fp.collections.BaseMap;
import org.organicdesign.fp.collections.ImList;
import org.organicdesign.fp.collections.PersistentHashMap;
import org.organicdesign.fp.collections.PersistentTreeMap;
import org.organicdesign.fp.collections.PersistentVector;
import org.springframework.http.HttpMethod;
import org.springframework.web.util.UriComponentsBuilder;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import java.net.URI;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.concurrent.atomic.AtomicReference;
import static com.google.common.base.Preconditions.checkArgument;
import static java.lang.String.CASE_INSENSITIVE_ORDER;
import static org.apiguardian.api.API.Status.INTERNAL;
import static org.springframework.web.util.UriComponentsBuilder.fromUriString;
import static org.springframework.web.util.UriUtils.encode;
import static org.zalando.fauxpas.FauxPas.throwingBiConsumer;
@API(status = INTERNAL)
@FieldDefaults(makeFinal = true, level = AccessLevel.PRIVATE)
@AllArgsConstructor
final class DefaultRequestArguments implements RequestArguments {
@Getter
@Wither
HttpMethod method;
@Getter
@Wither
URI baseUrl;
@Getter
@Wither
UrlResolution urlResolution;
@Getter
@Wither
String uriTemplate;
@Getter
@Singular
ImList uriVariables;
@Getter
@Wither
URI uri;
BaseMap, Object> attributes;
@Getter
BaseMap> queryParams;
AtomicReference requestUri = new AtomicReference<>();
@Getter
BaseMap> headers;
@Getter
@Wither
Object body;
@Getter
@Wither
Entity entity;
public DefaultRequestArguments() {
this(null, null, null, null, PersistentVector.empty(), null, PersistentHashMap.empty(),
PersistentHashMap.empty(), PersistentTreeMap.empty(CASE_INSENSITIVE_ORDER), null, null);
}
@Override
public Optional getAttribute(final Attribute attribute) {
@SuppressWarnings("unchecked")
@Nullable final T value = (T) attributes.get(attribute);
return Optional.ofNullable(value);
}
public URI getRequestUri() {
/*
* The construction of the request URI is deferred until someone actually needs it and then it's cached. From
* the perspective of users of RequestArguments it's effectively immutable.
*
* This pattern gives us two benefits:
*
* 1. Plugins may inspect the current request URI and will always see the latest version.
* 2. The URI is only constructed when needed, i.e. when nobody needs it it will be constructed exactly once
* during the network phase when the actual request is being executed.
*/
return requestUri.updateAndGet(previous -> {
if (previous != null) {
return previous;
}
@Nullable final URI uri = getUri();
@Nullable final URI unresolvedUri;
if (uri == null) {
final String uriTemplate = getUriTemplate();
if (uriTemplate == null || uriTemplate.isEmpty()) {
unresolvedUri = null;
} else {
// expand uri template
unresolvedUri = fromUriString(uriTemplate)
.buildAndExpand(getUriVariables().toArray())
.encode()
.toUri();
}
} else {
unresolvedUri = uri;
}
@Nullable final URI baseUrl = getBaseUrl();
@Nonnull final URI resolvedUri;
if (unresolvedUri == null) {
checkArgument(baseUrl != null, "Either Base URL or absolute Request URI is required");
resolvedUri = baseUrl;
} else if (baseUrl == null || unresolvedUri.isAbsolute()) {
resolvedUri = unresolvedUri;
} else {
resolvedUri = getUrlResolution().resolve(baseUrl, unresolvedUri);
}
final UriComponentsBuilder components = UriComponentsBuilder.newInstance();
// encode query params
getQueryParams().forEach(throwingBiConsumer((key, values) ->
values.forEach(value ->
components.queryParam(key, encode(value, "UTF-8")))));
// build request uri
final URI requestUri = components.uri(resolvedUri)
.build(true).normalize().toUri();
checkArgument(requestUri.isAbsolute(), "Request URI is not absolute");
return requestUri;
});
}
@Override
public RequestArguments replaceUriVariables(final List additionalUriVariables) {
return new DefaultRequestArguments(
method, baseUrl, urlResolution, uriTemplate, PersistentVector.ofIter(additionalUriVariables), uri,
attributes, queryParams, headers, body, entity);
}
@Override
public RequestArguments withAttribute(final Attribute attribute, final T value) {
return new DefaultRequestArguments(
method, baseUrl, urlResolution, uriTemplate, uriVariables, uri, attributes.assoc(attribute, value),
queryParams, headers, body, entity);
}
@Override
public RequestArguments withQueryParam(final String name, final String value) {
return queryParams(queryParams.assoc(name, getOrDefault(queryParams, name).append(value)));
}
@Override
public RequestArguments withQueryParams(final Map> additionalQueryParams) {
return queryParams(merge(queryParams, additionalQueryParams));
}
@Override
public RequestArguments withoutQueryParam(final String name) {
return queryParams(queryParams.without(name));
}
@Override
public RequestArguments replaceQueryParams(final Map> queryParams) {
return queryParams(merge(PersistentHashMap.empty(), queryParams));
}
private DefaultRequestArguments queryParams(final BaseMap> queryParams) {
return new DefaultRequestArguments(
method, baseUrl, urlResolution, uriTemplate, uriVariables, uri, attributes,
queryParams, headers, body, entity);
}
@Override
public RequestArguments withHeader(final String name, final String value) {
return headers(headers.assoc(name, getOrDefault(headers, name).append(value)));
}
@Override
public RequestArguments withHeaders(final Map> additionalHeaders) {
return headers(merge(headers, additionalHeaders));
}
@Override
public RequestArguments withoutHeader(final String name) {
return headers(headers.without(name));
}
@Override
public RequestArguments replaceHeaders(final Map> headers) {
return headers(merge(PersistentHashMap.empty(), headers));
}
private DefaultRequestArguments headers(final BaseMap> headers) {
return new DefaultRequestArguments(
method, baseUrl, urlResolution, uriTemplate, uriVariables, uri, attributes, queryParams,
headers, body, entity);
}
private BaseMap> merge(final BaseMap> map,
final Map> additions) {
BaseMap> result = map;
for (final Map.Entry> entry : additions.entrySet()) {
result = result.assoc(entry.getKey(), getOrDefault(result, entry.getKey()).concat(entry.getValue()));
}
return result;
}
private ImList getOrDefault(final BaseMap> map, final String key) {
return (ImList) map.getOrDefault(key, PersistentVector.empty());
}
}
