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RequestTemplate.java
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948 lines (847 loc) · 28.1 KB
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/**
* Copyright 2012-2020 The Feign Authors
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
* in compliance with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the License
* is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
* or implied. See the License for the specific language governing permissions and limitations under
* the License.
*/
package feign;
import feign.Request.HttpMethod;
import feign.template.*;
import java.io.Serializable;
import java.net.URI;
import java.nio.charset.Charset;
import java.util.AbstractMap.SimpleImmutableEntry;
import java.util.*;
import java.util.Map.Entry;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.stream.Collectors;
import static feign.Util.*;
/**
* Request Builder for an HTTP Target.
* <p>
* This class is a variation on a UriTemplate, where, in addition to the uri, Headers and Query
* information also support template expressions.
* </p>
*/
@SuppressWarnings("UnusedReturnValue")
public final class RequestTemplate implements Serializable {
private static final Pattern QUERY_STRING_PATTERN = Pattern.compile("(?<!\\{)\\?");
private final Map<String, QueryTemplate> queries = new LinkedHashMap<>();
private final Map<String, HeaderTemplate> headers = new TreeMap<>(String.CASE_INSENSITIVE_ORDER);
private String target;
private String fragment;
private boolean resolved = false;
private UriTemplate uriTemplate;
private BodyTemplate bodyTemplate;
private HttpMethod method;
private transient Charset charset = Util.UTF_8;
private Request.Body body = Request.Body.empty();
private boolean decodeSlash = true;
private CollectionFormat collectionFormat = CollectionFormat.EXPLODED;
private MethodMetadata methodMetadata;
private Target<?> feignTarget;
/**
* Create a new Request Template.
*/
public RequestTemplate() {
super();
}
/**
* Create a new Request Template.
*
* @param fragment part of the request uri.
* @param target for the template.
* @param uriTemplate for the template.
* @param bodyTemplate for the template, may be {@literal null}
* @param method of the request.
* @param charset for the request.
* @param body of the request, may be {@literal null}
* @param decodeSlash if the request uri should encode slash characters.
* @param collectionFormat when expanding collection based variables.
* @param feignTarget this template is targeted for.
* @param methodMetadata containing a reference to the method this template is built from.
*/
private RequestTemplate(String target,
String fragment,
UriTemplate uriTemplate,
BodyTemplate bodyTemplate,
HttpMethod method,
Charset charset,
Request.Body body,
boolean decodeSlash,
CollectionFormat collectionFormat,
MethodMetadata methodMetadata,
Target<?> feignTarget) {
this.target = target;
this.fragment = fragment;
this.uriTemplate = uriTemplate;
this.bodyTemplate = bodyTemplate;
this.method = method;
this.charset = charset;
this.body = body;
this.decodeSlash = decodeSlash;
this.collectionFormat =
(collectionFormat != null) ? collectionFormat : CollectionFormat.EXPLODED;
this.methodMetadata = methodMetadata;
this.feignTarget = feignTarget;
}
/**
* Create a Request Template from an existing Request Template.
*
* @param requestTemplate to copy from.
* @return a new Request Template.
*/
public static RequestTemplate from(RequestTemplate requestTemplate) {
RequestTemplate template =
new RequestTemplate(
requestTemplate.target,
requestTemplate.fragment,
requestTemplate.uriTemplate,
requestTemplate.bodyTemplate,
requestTemplate.method,
requestTemplate.charset,
requestTemplate.body,
requestTemplate.decodeSlash,
requestTemplate.collectionFormat,
requestTemplate.methodMetadata,
requestTemplate.feignTarget);
if (!requestTemplate.queries().isEmpty()) {
template.queries.putAll(requestTemplate.queries);
}
if (!requestTemplate.headers().isEmpty()) {
template.headers.putAll(requestTemplate.headers);
}
return template;
}
/**
* Resolve all expressions using the variable value substitutions provided. Variable values will
* be pct-encoded, if they are not already.
*
* @param variables containing the variable values to use when resolving expressions.
* @return a new Request Template with all of the variables resolved.
*/
public RequestTemplate resolve(Map<String, ?> variables) {
StringBuilder uri = new StringBuilder();
/* create a new template form this one, but explicitly */
RequestTemplate resolved = RequestTemplate.from(this);
if (this.uriTemplate == null) {
/* create a new uri template using the default root */
this.uriTemplate = UriTemplate.create("", !this.decodeSlash, this.charset);
}
String expanded = this.uriTemplate.expand(variables);
if (expanded != null) {
uri.append(expanded);
}
/*
* for simplicity, combine the queries into the uri and use the resulting uri to seed the
* resolved template.
*/
if (!this.queries.isEmpty()) {
/*
* since we only want to keep resolved query values, reset any queries on the resolved copy
*/
resolved.queries(Collections.emptyMap());
StringBuilder query = new StringBuilder();
Iterator<QueryTemplate> queryTemplates = this.queries.values().iterator();
while (queryTemplates.hasNext()) {
QueryTemplate queryTemplate = queryTemplates.next();
String queryExpanded = queryTemplate.expand(variables);
if (Util.isNotBlank(queryExpanded)) {
query.append(queryExpanded);
if (queryTemplates.hasNext()) {
query.append("&");
}
}
}
String queryString = query.toString();
if (!queryString.isEmpty()) {
Matcher queryMatcher = QUERY_STRING_PATTERN.matcher(uri);
if (queryMatcher.find()) {
/* the uri already has a query, so any additional queries should be appended */
uri.append("&");
} else {
uri.append("?");
}
uri.append(queryString);
}
}
/* add the uri to result */
resolved.uri(uri.toString());
/* headers */
if (!this.headers.isEmpty()) {
/*
* same as the query string, we only want to keep resolved values, so clear the header map on
* the resolved instance
*/
resolved.headers(Collections.emptyMap());
for (HeaderTemplate headerTemplate : this.headers.values()) {
/* resolve the header */
String header = headerTemplate.expand(variables);
if (!header.isEmpty()) {
/* split off the header values and add it to the resolved template */
String headerValues = header.substring(header.indexOf(" ") + 1);
if (!headerValues.isEmpty()) {
/* append the header as a new literal as the value has already been expanded. */
resolved.header(headerTemplate.getName(), Literal.create(headerValues));
}
}
}
}
if (this.bodyTemplate != null) {
resolved.body(this.bodyTemplate.expand(variables));
}
/* mark the new template resolved */
resolved.resolved = true;
return resolved;
}
/**
* Creates a {@link Request} from this template. The template must be resolved before calling this
* method, or an {@link IllegalStateException} will be thrown.
*
* @return a new Request instance.
* @throws IllegalStateException if this template has not been resolved.
*/
public Request request() {
if (!this.resolved) {
throw new IllegalStateException("template has not been resolved.");
}
return Request.create(this.method, this.url(), this.headers(), this.body, this);
}
/**
* Set the Http Method.
*
* @param method to use.
* @return a RequestTemplate for chaining.
*/
public RequestTemplate method(HttpMethod method) {
checkNotNull(method, "method");
this.method = method;
return this;
}
/**
* The Request Http Method.
*
* @return Http Method.
*/
public String method() {
return (method != null) ? method.name() : null;
}
/**
* Set whether do encode slash {@literal /} characters when resolving this template.
*
* @param decodeSlash if slash literals should not be encoded.
* @return a RequestTemplate for chaining.
*/
public RequestTemplate decodeSlash(boolean decodeSlash) {
this.decodeSlash = decodeSlash;
this.uriTemplate =
UriTemplate.create(this.uriTemplate.toString(), !this.decodeSlash, this.charset);
if (!this.queries.isEmpty()) {
this.queries.replaceAll((key, queryTemplate) -> QueryTemplate.create(
/* replace the current template with new ones honoring the decode value */
queryTemplate.getName(), queryTemplate.getValues(), charset, collectionFormat,
decodeSlash));
}
return this;
}
/**
* If slash {@literal /} characters are not encoded when resolving.
*
* @return true if slash literals are not encoded, false otherwise.
*/
public boolean decodeSlash() {
return decodeSlash;
}
/**
* The Collection Format to use when resolving variables that represent {@link Iterable}s or
* {@link Collection}s
*
* @param collectionFormat to use.
* @return a RequestTemplate for chaining.
*/
public RequestTemplate collectionFormat(CollectionFormat collectionFormat) {
this.collectionFormat = collectionFormat;
return this;
}
/**
* The Collection Format that will be used when resolving {@link Iterable} and {@link Collection}
* variables.
*
* @return the collection format set
*/
@SuppressWarnings("unused")
public CollectionFormat collectionFormat() {
return collectionFormat;
}
/**
* Set the Uri for the request, replacing the existing uri if set.
*
* @param uri to use, must be a relative uri.
* @return a RequestTemplate for chaining.
*/
public RequestTemplate uri(String uri) {
return this.uri(uri, false);
}
/**
* Set the uri for the request.
*
* @param uri to use, must be a relative uri.
* @param append if the uri should be appended, if the uri is already set.
* @return a RequestTemplate for chaining.
*/
public RequestTemplate uri(String uri, boolean append) {
/* validate and ensure that the url is always a relative one */
if (UriUtils.isAbsolute(uri)) {
throw new IllegalArgumentException("url values must be not be absolute.");
}
if (uri == null) {
uri = "/";
} else if ((!uri.isEmpty() && !uri.startsWith("/") && !uri.startsWith("{")
&& !uri.startsWith("?") && !uri.startsWith(";"))) {
/* if the start of the url is a literal, it must begin with a slash. */
uri = "/" + uri;
}
/*
* templates may provide query parameters. since we want to manage those explicity, we will need
* to extract those out, leaving the uriTemplate with only the path to deal with.
*/
Matcher queryMatcher = QUERY_STRING_PATTERN.matcher(uri);
if (queryMatcher.find()) {
String queryString = uri.substring(queryMatcher.start() + 1);
/* parse the query string */
this.extractQueryTemplates(queryString, append);
/* reduce the uri to the path */
uri = uri.substring(0, queryMatcher.start());
}
int fragmentIndex = uri.indexOf('#');
if (fragmentIndex > -1) {
fragment = uri.substring(fragmentIndex);
uri = uri.substring(0, fragmentIndex);
}
/* replace the uri template */
if (append && this.uriTemplate != null) {
this.uriTemplate = UriTemplate.append(this.uriTemplate, uri);
} else {
this.uriTemplate = UriTemplate.create(uri, !this.decodeSlash, this.charset);
}
return this;
}
/**
* Set the target host for this request.
*
* @param target host for this request. Must be an absolute target.
* @return a RequestTemplate for chaining.
*/
public RequestTemplate target(String target) {
/* target can be empty */
if (Util.isBlank(target)) {
return this;
}
/* verify that the target contains the scheme, host and port */
if (!UriUtils.isAbsolute(target)) {
throw new IllegalArgumentException("target values must be absolute.");
}
if (target.endsWith("/")) {
target = target.substring(0, target.length() - 1);
}
try {
/* parse the target */
URI targetUri = URI.create(target);
if (Util.isNotBlank(targetUri.getRawQuery())) {
/*
* target has a query string, we need to make sure that they are recorded as queries
*/
this.extractQueryTemplates(targetUri.getRawQuery(), true);
}
/* strip the query string */
this.target = targetUri.getScheme() + "://" + targetUri.getAuthority() + targetUri.getPath();
if (targetUri.getFragment() != null) {
this.fragment = "#" + targetUri.getFragment();
}
} catch (IllegalArgumentException iae) {
/* the uri provided is not a valid one, we can't continue */
throw new IllegalArgumentException("Target is not a valid URI.", iae);
}
return this;
}
/**
* The URL for the request. If the template has not been resolved, the url will represent a uri
* template.
*
* @return the url
*/
public String url() {
/* build the fully qualified url with all query parameters */
StringBuilder url = new StringBuilder(this.path());
if (!this.queries.isEmpty()) {
url.append(this.queryLine());
}
if (fragment != null) {
url.append(fragment);
}
return url.toString();
}
/**
* The Uri Path.
*
* @return the uri path.
*/
public String path() {
/* build the fully qualified url with all query parameters */
StringBuilder path = new StringBuilder();
if (this.target != null) {
path.append(this.target);
}
if (this.uriTemplate != null) {
path.append(this.uriTemplate.toString());
}
if (path.length() == 0) {
/* no path indicates the root uri */
path.append("/");
}
return path.toString();
}
/**
* List all of the template variable expressions for this template.
*
* @return a list of template variable names
*/
public List<String> variables() {
/* combine the variables from the uri, query, header, and body templates */
List<String> variables = new ArrayList<>(this.uriTemplate.getVariables());
/* queries */
for (QueryTemplate queryTemplate : this.queries.values()) {
variables.addAll(queryTemplate.getVariables());
}
/* headers */
for (HeaderTemplate headerTemplate : this.headers.values()) {
variables.addAll(headerTemplate.getVariables());
}
/* body */
if (this.bodyTemplate != null) {
variables.addAll(this.bodyTemplate.getVariables());
}
return variables;
}
/**
* @see RequestTemplate#query(String, Iterable)
*/
public RequestTemplate query(String name, String... values) {
if (values == null) {
return query(name, Collections.emptyList());
}
return query(name, Arrays.asList(values));
}
/**
* Specify a Query String parameter, with the specified values. Values can be literals or template
* expressions.
*
* @param name of the parameter.
* @param values for this parameter.
* @return a RequestTemplate for chaining.
*/
public RequestTemplate query(String name, Iterable<String> values) {
return appendQuery(name, values, this.collectionFormat);
}
/**
* Specify a Query String parameter, with the specified values. Values can be literals or template
* expressions.
*
* @param name of the parameter.
* @param values for this parameter.
* @param collectionFormat to use when resolving collection based expressions.
* @return a Request Template for chaining.
*/
public RequestTemplate query(String name,
Iterable<String> values,
CollectionFormat collectionFormat) {
return appendQuery(name, values, collectionFormat);
}
/**
* Appends the query name and values.
*
* @param name of the parameter.
* @param values for the parameter, may be expressions.
* @param collectionFormat to use when resolving collection based query variables.
* @return a RequestTemplate for chaining.
*/
private RequestTemplate appendQuery(String name,
Iterable<String> values,
CollectionFormat collectionFormat) {
if (!values.iterator().hasNext()) {
/* empty value, clear the existing values */
this.queries.remove(name);
return this;
}
/* create a new query template out of the information here */
this.queries.compute(name, (key, queryTemplate) -> {
if (queryTemplate == null) {
return QueryTemplate.create(name, values, this.charset, collectionFormat, this.decodeSlash);
} else {
return QueryTemplate.append(queryTemplate, values, collectionFormat, this.decodeSlash);
}
});
return this;
}
/**
* Sets the Query Parameters.
*
* @param queries to use for this request.
* @return a RequestTemplate for chaining.
*/
@SuppressWarnings("unused")
public RequestTemplate queries(Map<String, Collection<String>> queries) {
if (queries == null || queries.isEmpty()) {
this.queries.clear();
} else {
queries.forEach(this::query);
}
return this;
}
/**
* Return an immutable Map of all Query Parameters and their values.
*
* @return registered Query Parameters.
*/
public Map<String, Collection<String>> queries() {
Map<String, Collection<String>> queryMap = new LinkedHashMap<>();
this.queries.forEach((key, queryTemplate) -> {
List<String> values = new ArrayList<>(queryTemplate.getValues());
/* add the expanded collection, but lock it */
queryMap.put(key, Collections.unmodifiableList(values));
});
return Collections.unmodifiableMap(queryMap);
}
/**
* @see RequestTemplate#header(String, Iterable)
*/
public RequestTemplate header(String name, String... values) {
return header(name, Arrays.asList(values));
}
/**
* Add a header using the supplied Chunks.
*
* @param name of the header.
* @param chunks to add.
* @return a RequestTemplate for chaining.
*/
private RequestTemplate header(String name, TemplateChunk... chunks) {
if (chunks == null) {
throw new IllegalArgumentException("chunks are required.");
}
return appendHeader(name, Arrays.asList(chunks));
}
/**
* Specify a Header, with the specified values. Values can be literals or template expressions.
*
* @param name of the header.
* @param values for this header.
* @return a RequestTemplate for chaining.
*/
public RequestTemplate header(String name, Iterable<String> values) {
if (name == null || name.isEmpty()) {
throw new IllegalArgumentException("name is required.");
}
if (values == null) {
values = Collections.emptyList();
}
return appendHeader(name, values);
}
/**
* Clear on reader from {@link RequestTemplate}
*
* @param name of the header.
* @return a RequestTemplate for chaining.
*/
public RequestTemplate removeHeader(String name) {
if (name == null || name.isEmpty()) {
throw new IllegalArgumentException("name is required.");
}
this.headers.remove(name);
return this;
}
/**
* Create a Header Template.
*
* @param name of the header
* @param values for the header, may be expressions.
* @return a RequestTemplate for chaining.
*/
private RequestTemplate appendHeader(String name, Iterable<String> values) {
if (!values.iterator().hasNext()) {
/* empty value, clear the existing values */
this.headers.remove(name);
return this;
}
if (name.equals("Content-Type")) {
// a client can only produce content of one single type, so always override Content-Type and
// only add a single type
this.headers.remove(name);
this.headers.put(name,
HeaderTemplate.create(name, Collections.singletonList(values.iterator().next())));
return this;
}
this.headers.compute(name, (headerName, headerTemplate) -> {
if (headerTemplate == null) {
return HeaderTemplate.create(headerName, values);
} else {
return HeaderTemplate.append(headerTemplate, values);
}
});
return this;
}
private RequestTemplate appendHeader(String name, List<TemplateChunk> chunks) {
if (chunks.isEmpty()) {
this.headers.remove(name);
return this;
}
this.headers.compute(name, (headerName, headerTemplate) -> {
if (headerTemplate == null) {
return HeaderTemplate.from(name, chunks);
} else {
return HeaderTemplate.appendFrom(headerTemplate, chunks);
}
});
return this;
}
/**
* Headers for this Request.
*
* @param headers to use.
* @return a RequestTemplate for chaining.
*/
public RequestTemplate headers(Map<String, Collection<String>> headers) {
if (headers != null && !headers.isEmpty()) {
headers.forEach(this::header);
} else {
this.headers.clear();
}
return this;
}
/**
* Returns an immutable copy of the Headers for this request.
*
* @return the currently applied headers.
*/
public Map<String, Collection<String>> headers() {
Map<String, Collection<String>> headerMap = new TreeMap<>(String.CASE_INSENSITIVE_ORDER);
this.headers.forEach((key, headerTemplate) -> {
List<String> values = new ArrayList<>(headerTemplate.getValues());
/* add the expanded collection, but only if it has values */
if (!values.isEmpty()) {
headerMap.put(key, Collections.unmodifiableList(values));
}
});
return Collections.unmodifiableMap(headerMap);
}
/**
* Sets the Body and Charset for this request.
*
* @param data to send, can be null.
* @param charset of the encoded data.
* @return a RequestTemplate for chaining.
*/
public RequestTemplate body(byte[] data, Charset charset) {
this.body(Request.Body.create(data, charset));
return this;
}
/**
* Set the Body for this request. Charset is assumed to be UTF_8. Data must be encoded.
*
* @param bodyText to send.
* @return a RequestTemplate for chaining.
*/
public RequestTemplate body(String bodyText) {
this.body(Request.Body.create(bodyText.getBytes(this.charset), this.charset));
return this;
}
/**
* Set the Body for this request.
*
* @param body to send.
* @return a RequestTemplate for chaining.
*/
private RequestTemplate body(Request.Body body) {
this.body = body;
/* body template must be cleared to prevent double processing */
this.bodyTemplate = null;
header(CONTENT_LENGTH, Collections.emptyList());
if (body.length() > 0) {
header(CONTENT_LENGTH, String.valueOf(body.length()));
}
return this;
}
/**
* Charset of the Request Body, if known.
*
* @return the currently applied Charset.
*/
public Charset requestCharset() {
if (this.body != null) {
return this.body.getEncoding()
.orElse(this.charset);
}
return this.charset;
}
/**
* The Request Body.
*
* @return the request body.
*/
public byte[] body() {
return body.asBytes();
}
/**
* Specify the Body Template to use. Can contain literals and expressions.
*
* @param bodyTemplate to use.
* @return a RequestTemplate for chaining.
*/
public RequestTemplate bodyTemplate(String bodyTemplate) {
this.bodyTemplate = BodyTemplate.create(bodyTemplate, this.charset);
return this;
}
/**
* Specify the Body Template to use. Can contain literals and expressions.
*
* @param bodyTemplate to use.
* @return a RequestTemplate for chaining.
*/
public RequestTemplate bodyTemplate(String bodyTemplate, Charset charset) {
this.bodyTemplate = BodyTemplate.create(bodyTemplate, charset);
this.charset = charset;
return this;
}
/**
* Body Template to resolve.
*
* @return the unresolved body template.
*/
public String bodyTemplate() {
if (this.bodyTemplate != null) {
return this.bodyTemplate.toString();
}
return null;
}
@Override
public String toString() {
return request().toString();
}<
47C2
/div>
/**
* Return if the variable exists on the uri, query, or headers, in this template.
*
* @param variable to look for.
* @return true if the variable exists, false otherwise.
*/
public boolean hasRequestVariable(String variable) {
return this.getRequestVariables().contains(variable);
}
/**
* Retrieve all uri, header, and query template variables.
*
* @return a List of all the variable names.
*/
public Collection<String> getRequestVariables() {
final Collection<String> variables = new LinkedHashSet<>(this.uriTemplate.getVariables());
this.queries.values().forEach(queryTemplate -> variables.addAll(queryTemplate.getVariables()));
this.headers.values()
.forEach(headerTemplate -> variables.addAll(headerTemplate.getVariables()));
return variables;
}
/**
* If this template has been resolved.
*
* @return true if the template has been resolved, false otherwise.
*/
@SuppressWarnings("unused")
public boolean resolved() {
return this.resolved;
}
/**
* The Query String for the template. Expressions are not resolved.
*
* @return the Query String.
*/
public String queryLine() {
StringBuilder queryString = new StringBuilder();
if (!this.queries.isEmpty()) {
Iterator<QueryTemplate> iterator = this.queries.values().iterator();
while (iterator.hasNext()) {
QueryTemplate queryTemplate = iterator.next();
String query = queryTemplate.toString();
if (query != null && !query.isEmpty()) {
queryString.append(query);
if (iterator.hasNext()) {
queryString.append("&");
}
}
}
}
/* remove any trailing ampersands */
String result = queryString.toString();
if (result.endsWith("&")) {
result = result.substring(0, result.length() - 1);
}
if (!result.isEmpty()) {
result = "?" + result;
}
return result;
}
private void extractQueryTemplates(String queryString, boolean append) {
/* split the query string up into name value pairs */
Map<String, List<String>> queryParameters =
Arrays.stream(queryString.split("&"))
.map(this::splitQueryParameter)
.collect(Collectors.groupingBy(
SimpleImmutableEntry::getKey,
LinkedHashMap::new,
Collectors.mapping(Entry::getValue, Collectors.toList())));
/* add them to this template */
if (!append) {
/* clear the queries and use the new ones */
this.queries.clear();
}
queryParameters.forEach(this::query);
}
private SimpleImmutableEntry<String, String> splitQueryParameter(String pair) {
int eq = pair.indexOf("=");
final String name = (eq > 0) ? pair.substring(0, eq) : pair;
final String value = (eq > 0 && eq < pair.length()) ? pair.substring(eq + 1) : null;
return new SimpleImmutableEntry<>(name, value);
}
@Experimental
public RequestTemplate methodMetadata(MethodMetadata methodMetadata) {
this.methodMetadata = methodMetadata;
return this;
}
@Experimental
public RequestTemplate feignTarget(Target<?> feignTarget) {
this.feignTarget = feignTarget;
return this;
}
@Experimental
public MethodMetadata methodMetadata() {
return methodMetadata;
}
@Experimental
public Target<?> feignTarget() {
return feignTarget;
}
/**
* Factory for creating RequestTemplate.
*/
interface Factory {
/**
* create a request template using args passed to a method invocation.
*/
RequestTemplate create(Object[] argv);
}
}