feat: Add support for additional_bindings (#993)

This PR depends on the corresponding one in gax: googleapis/gax-java#1680

gapic-generator-java/src/main/java/com/google/api/generator/gapic/composer/rest/HttpJsonServiceStubClassComposer.java

@@ -348,6 +348,16 @@ private List<Expr> getRequestFormatterExpr(Method protoMethod) {
                         "putPathParam")))
             .apply(expr);
 
+    if (!protoMethod.httpBindings().lowerCamelAdditionalPatterns().isEmpty()) {
+      expr =
+          methodMaker
+              .apply(
+                  "setAdditionalPaths",
+                  protoMethod.httpBindings().lowerCamelAdditionalPatterns().stream()
+                      .map(a -> ValueExpr.withValue(StringObjectValue.withValue(a)))
+                      .collect(Collectors.toList()))
+              .apply(expr);
+    }
     TypeNode fieldsVarGenericType =
         TypeNode.withReference(
             ConcreteReference.builder()

gapic-generator-java/src/main/java/com/google/api/generator/gapic/model/HttpBindings.java

@@ -18,8 +18,10 @@
 import com.google.auto.value.AutoValue;
 import com.google.common.collect.ImmutableSet;
 import java.util.HashMap;
+import java.util.List;
 import java.util.Map;
 import java.util.Set;
+import java.util.stream.Collectors;
 import javax.annotation.Nullable;
 
 @AutoValue
@@ -63,6 +65,8 @@ public int compareTo(HttpBinding o) {
 
   public abstract String pattern();
 
+  public abstract List<String> additionalPatterns();
+
   public abstract Set<HttpBinding> pathParameters();
 
   public abstract Set<HttpBinding> queryParameters();
@@ -84,8 +88,18 @@ public static HttpBindings.Builder builder() {
   //   in .proto file: "/global/instanceTemplates/{instance_template=*}"
   //   in .java file:  "/global/instanceTemplates/{instanceTemplate=*}"
   public String lowerCamelPattern() {
-    String lowerCamelPattern = pattern();
-    for (HttpBinding pathParam : pathParameters()) {
+    return lowerCamelPattern(pattern(), pathParameters());
+  }
+
+  public List<String> lowerCamelAdditionalPatterns() {
+    return additionalPatterns().stream()
+        .map(a -> lowerCamelPattern(a, pathParameters()))
+        .collect(Collectors.toList());
+  }
+
+  private static String lowerCamelPattern(String originalPattern, Set<HttpBinding> pathParameters) {
+    String lowerCamelPattern = originalPattern;
+    for (HttpBinding pathParam : pathParameters) {
       lowerCamelPattern =
           lowerCamelPattern.replaceAll(
               "\\{" + pathParam.name(), "{" + JavaStyle.toLowerCamelCase(pathParam.name()));
@@ -107,6 +121,8 @@ public abstract static class Builder {
 
     public abstract HttpBindings.Builder setPattern(String pattern);
 
+    public abstract HttpBindings.Builder setAdditionalPatterns(List<String> additionalPatterns);
+
     abstract String pattern();
 
     public abstract HttpBindings.Builder setPathParameters(Set<HttpBinding> pathParameters);

gapic-generator-java/src/main/java/com/google/api/generator/gapic/protoparser/HttpRuleParser.java

@@ -36,6 +36,7 @@
 import java.util.Set;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
+import java.util.stream.Collectors;
 
 public class HttpRuleParser {
   private static final String ASTERISK = "*";
@@ -68,11 +69,12 @@ private static HttpBindings parseHttpRuleHelper(
     // Get pattern.
     String pattern = getHttpVerbPattern(httpRule);
     ImmutableSet.Builder<String> bindingsBuilder = ImmutableSet.builder();
-    bindingsBuilder.addAll(PatternParser.getPattenBindings(pattern));
+    bindingsBuilder.addAll(PatternParser.getPatternBindings(pattern));
     if (httpRule.getAdditionalBindingsCount() > 0) {
       for (HttpRule additionalRule : httpRule.getAdditionalBindingsList()) {
         // TODO: save additional bindings path in HttpRuleBindings
-        bindingsBuilder.addAll(PatternParser.getPattenBindings(getHttpVerbPattern(additionalRule)));
+        bindingsBuilder.addAll(
+            PatternParser.getPatternBindings(getHttpVerbPattern(additionalRule)));
       }
     }
 
@@ -104,6 +106,10 @@ private static HttpBindings parseHttpRuleHelper(
     return HttpBindings.builder()
         .setHttpVerb(HttpBindings.HttpVerb.valueOf(httpRule.getPatternCase().toString()))
         .setPattern(pattern)
+        .setAdditionalPatterns(
+            httpRule.getAdditionalBindingsList().stream()
+                .map(HttpRuleParser::getHttpVerbPattern)
+                .collect(Collectors.toList()))
         .setPathParameters(
             validateAndConstructHttpBindings(
                 pathParamNames, message, messageTypes, patternSampleValues))

gapic-generator-java/src/main/java/com/google/api/generator/gapic/protoparser/PatternParser.java

@@ -22,7 +22,7 @@ public class PatternParser {
 
   // This method tries to parse all named segments from pattern and sort in natual order
   // e.g. /v1beta1/{table_name=tests/*}/{routing_id=instances/*}/** -> (routing_id, table_name)
-  public static Set<String> getPattenBindings(String pattern) {
+  public static Set<String> getPatternBindings(String pattern) {
     ImmutableSortedSet.Builder<String> bindings = ImmutableSortedSet.naturalOrder();
     if (pattern.isEmpty()) {
       return bindings.build();

gapic-generator-java/src/main/java/com/google/api/generator/gapic/protoparser/RoutingRuleParser.java

@@ -49,7 +49,7 @@ public static RoutingHeaderRule parse(
         key = fieldName;
         pathTemplate = String.format("{%s=**}", key);
       } else {
-        Set<String> namedSegments = PatternParser.getPattenBindings(pathTemplate);
+        Set<String> namedSegments = PatternParser.getPatternBindings(pathTemplate);
         Preconditions.checkArgument(
             namedSegments.size() == 1,
             String.format(

gapic-generator-java/src/test/java/com/google/api/generator/gapic/composer/grpcrest/goldens/HttpJsonEchoStub.golden

@@ -302,6 +302,9 @@ public class HttpJsonEchoStub extends EchoStub {
                             fields, "fooBar.name", request.getFooBar().getName());
                         return fields;
                       })
+                  .setAdditionalPaths(
+                      "/v1beta1/{fooBar.name=cats/*/dogs/*}/echo:foo",
+                      "/v1beta1/{fooBar.name=turtles/*/parrots/*}/echo:foo")
                   .setQueryParamsExtractor(
                       request -> {
                         Map<String, List<String>> fields = new HashMap<>();

gapic-generator-java/src/test/java/com/google/api/generator/gapic/model/MethodTest.java

@@ -21,6 +21,7 @@
 import com.google.api.generator.gapic.model.HttpBindings.HttpVerb;
 import com.google.api.generator.gapic.model.RoutingHeaderRule.RoutingHeaderParam;
 import com.google.common.collect.ImmutableSet;
+import java.util.Arrays;
 import org.junit.Test;
 
 public class MethodTest {
@@ -35,6 +36,7 @@ public class MethodTest {
       HttpBindings.builder()
           .setPathParameters(ImmutableSet.of(HttpBinding.create("table", true, false, "")))
           .setPattern("/pattern/test")
+          .setAdditionalPatterns(Arrays.asList("/extra_pattern/test", "/extra_pattern/hey"))
           .setIsAsteriskBody(false)
           .setHttpVerb(HttpVerb.GET)
           .build();

gapic-generator-java/src/test/java/com/google/api/generator/gapic/protoparser/PatternParserTest.java

@@ -22,19 +22,19 @@
 public class PatternParserTest {
   @Test
   public void getPattenBindings_shouldReturnEmptySetIfPatternIsEmpty() {
-    assertThat(PatternParser.getPattenBindings("")).isEmpty();
+    assertThat(PatternParser.getPatternBindings("")).isEmpty();
   }
 
   @Test
   public void getPattenBindings_shouldFilterOutUnboundVariables() {
-    Set<String> actual = PatternParser.getPattenBindings("{routing_id=projects/*}/**");
+    Set<String> actual = PatternParser.getPatternBindings("{routing_id=projects/*}/**");
     assertThat(actual).hasSize(1);
   }
 
   @Test
   public void getPattenBindings_shouldReturnBindingsInNatualOrder() {
     Set<String> actual =
-        PatternParser.getPattenBindings("{routing_id=projects/*}/{name=instance/*}");
+        PatternParser.getPatternBindings("{routing_id=projects/*}/{name=instance/*}");
     assertThat(actual).containsExactly("name", "routing_id").inOrder();
   }
 }

gapic-generator-java/src/test/proto/echo_grpcrest.proto

@@ -125,6 +125,14 @@ service Echo {
     option (google.api.http) = {
       post: "/v1beta1/{foo_bar.name=projects/*/foobars/*}/echo:foo"
       body: "*"
+      additional_bindings {
+        post: "/v1beta1/{foo_bar.name=cats/*/dogs/*}/echo:foo"
+        body: "*"
+      }
+      additional_bindings {
+        post: "/v1beta1/{foo_bar.name=turtles/*/parrots/*}/echo:foo"
+        body: "*"
+      }
     };
   }
 }