feat: add self signed jwt support

oauth2_http/java/com/google/auth/oauth2/AppEngineCredentials.java

@@ -69,6 +69,7 @@ class AppEngineCredentials extends GoogleCredentials implements ServiceAccountSi
   private static final String GET_SIGNATURE_METHOD = "getSignature";
 
   private final Collection<String> scopes;
+  private final Collection<String> defaultScopes;
   private final boolean scopesRequired;
 
   private transient Object appIdentityService;
@@ -79,19 +80,25 @@ class AppEngineCredentials extends GoogleCredentials implements ServiceAccountSi
   private transient Method getSignature;
   private transient String account;
 
-  AppEngineCredentials(Collection<String> scopes) throws IOException {
+  AppEngineCredentials(Collection<String> scopes, Collection<String> defaultScopes)
+      throws IOException {
     this.scopes = scopes == null ? ImmutableSet.<String>of() : ImmutableList.copyOf(scopes);
-    this.scopesRequired = this.scopes.isEmpty();
+    this.defaultScopes =
+        defaultScopes == null ? ImmutableSet.<String>of() : ImmutableList.copyOf(defaultScopes);
+    this.scopesRequired = this.scopes.isEmpty() && this.defaultScopes.isEmpty();
     init();
   }
 
-  AppEngineCredentials(Collection<String> scopes, AppEngineCredentials unscoped) {
+  AppEngineCredentials(
+      Collection<String> scopes, Collection<String> defaultScopes, AppEngineCredentials unscoped) {
     this.appIdentityService = unscoped.appIdentityService;
     this.getAccessToken = unscoped.getAccessToken;
     this.getAccessTokenResult = unscoped.getAccessTokenResult;
     this.getExpirationTime = unscoped.getExpirationTime;
     this.scopes = scopes == null ? ImmutableSet.<String>of() : ImmutableList.copyOf(scopes);
-    this.scopesRequired = this.scopes.isEmpty();
+    this.defaultScopes =
+        defaultScopes == null ? ImmutableSet.<String>of() : ImmutableList.copyOf(defaultScopes);
+    this.scopesRequired = this.scopes.isEmpty() && this.defaultScopes.isEmpty();
   }
 
   private void init() throws IOException {
@@ -129,7 +136,11 @@ public AccessToken refreshAccessToken() throws IOException {
       throw new IOException("AppEngineCredentials requires createScoped call before use.");
     }
     try {
-      Object accessTokenResult = getAccessTokenResult.invoke(appIdentityService, scopes);
+      Collection<String> scopesToUse = scopes;
+      if (scopes.isEmpty()) {
+        scopesToUse = defaultScopes;
+      }
+      Object accessTokenResult = getAccessTokenResult.invoke(appIdentityService, scopesToUse);
       String accessToken = (String) getAccessToken.invoke(accessTokenResult);
       Date expirationTime = (Date) getExpirationTime.invoke(accessTokenResult);
       return new AccessToken(accessToken, expirationTime);
@@ -145,7 +156,13 @@ public boolean createScopedRequired() {
 
   @Override
   public GoogleCredentials createScoped(Collection<String> scopes) {
-    return new AppEngineCredentials(scopes, this);
+    return new AppEngineCredentials(scopes, null, this);
+  }
+
+  @Override
+  public GoogleCredentials createScoped(
+      Collection<String> scopes, Collection<String> defaultScopes) {
+    return new AppEngineCredentials(scopes, defaultScopes, this);
   }
 
   @Override
@@ -165,13 +182,14 @@ public byte[] sign(byte[] toSign) {
 
   @Override
   public int hashCode() {
-    return Objects.hash(scopes, scopesRequired);
+    return Objects.hash(scopes, defaultScopes, scopesRequired);
   }
 
   @Override
   public String toString() {
     return MoreObjects.toStringHelper(this)
         .add("scopes", scopes)
+        .add("defaultScopes", defaultScopes)
         .add("scopesRequired", scopesRequired)
         .toString();
   }
@@ -182,7 +200,9 @@ public boolean equals(Object obj) {
       return false;
     }
     AppEngineCredentials other = (AppEngineCredentials) obj;
-    return this.scopesRequired == other.scopesRequired && Objects.equals(this.scopes, other.scopes);
+    return this.scopesRequired == other.scopesRequired
+        && Objects.equals(this.scopes, other.scopes)
+        && Objects.equals(this.defaultScopes, other.defaultScopes);
   }
 
   private void readObject(ObjectInputStream input) throws IOException, ClassNotFoundException {

oauth2_http/java/com/google/auth/oauth2/ComputeEngineCredentials.java

@@ -99,6 +99,7 @@ public class ComputeEngineCredentials extends GoogleCredentials
   private final String transportFactoryClassName;
 
   private final Collection<String> scopes;
+  private final Collection<String> defaultScopes;
 
   private transient HttpTransportFactory transportFactory;
   private transient String serviceAccountEmail;
@@ -109,9 +110,13 @@ public class ComputeEngineCredentials extends GoogleCredentials
    * @param transportFactory HTTP transport factory, creates the transport used to get access
    *     tokens.
    * @param scopes scope strings for the APIs to be called. May be null or an empty collection.
+   * @param defaultScopes default scope strings for the APIs to be called. May be null or an empty
+   *     collection.
    */
   private ComputeEngineCredentials(
-      HttpTransportFactory transportFactory, Collection<String> scopes) {
+      HttpTransportFactory transportFactory,
+      Collection<String> scopes,
+      Collection<String> defaultScopes) {
     this.transportFactory =
         firstNonNull(
             transportFactory,
@@ -124,12 +129,26 @@ private ComputeEngineCredentials(
       scopeList.removeAll(Arrays.asList("", null));
       this.scopes = ImmutableSet.<String>copyOf(scopeList);
     }
+    if (defaultScopes == null) {
+      this.defaultScopes = ImmutableSet.<String>of();
+    } else {
+      List<String> scopeList = new ArrayList<String>(defaultScopes);
+      scopeList.removeAll(Arrays.asList("", null));
+      this.defaultScopes = ImmutableSet.<String>copyOf(scopeList);
+    }
   }
 
   /** Clones the compute engine account with the specified scopes. */
   @Override
   public GoogleCredentials createScoped(Collection<String> newScopes) {
-    return new ComputeEngineCredentials(this.transportFactory, newScopes);
+    return new ComputeEngineCredentials(this.transportFactory, newScopes, null);
+  }
+
+  /** Clones the compute engine account with the specified scopes. */
+  @Override
+  public GoogleCredentials createScoped(
+      Collection<String> newScopes, Collection<String> newDefaultScopes) {
+    return new ComputeEngineCredentials(this.transportFactory, newScopes, newDefaultScopes);
   }
 
   /**
@@ -138,22 +157,30 @@ public GoogleCredentials createScoped(Collection<String> newScopes) {
    * @return new ComputeEngineCredentials
    */
   public static ComputeEngineCredentials create() {
-    return new ComputeEngineCredentials(null, null);
+    return new ComputeEngineCredentials(null, null, null);
   }
 
   public final Collection<String> getScopes() {
     return scopes;
   }
 
+  public final Collection<String> getDefaultScopes() {
+    return defaultScopes;
+  }
+
   /**
-   * If scopes is specified, add "?scopes=comma-separated-list-of-scopes" to the token url.
+   * If scopes or defaultScopes is specified, add "?scopes=comma-separated-list-of-scopes" to the
+   * token url. defaultScopes is not used unless scopes is empty.
    *
-   * @return token url with the given scopes
+   * @return token url with the given scopes or defaultScopes. defaultScopes is not used unless
+   *     scopes is emtpy.
    */
   String createTokenUrlWithScopes() {
     GenericUrl tokenUrl = new GenericUrl(getTokenServerEncodedUrl());
     if (!scopes.isEmpty()) {
       tokenUrl.set("scopes", Joiner.on(',').join(scopes));
+    } else if (!defaultScopes.isEmpty()) {
+      tokenUrl.set("scopes", Joiner.on(',').join(defaultScopes));
     }
     return tokenUrl.toString();
   }
@@ -345,7 +372,8 @@ public boolean equals(Object obj) {
     }
     ComputeEngineCredentials other = (ComputeEngineCredentials) obj;
     return Objects.equals(this.transportFactoryClassName, other.transportFactoryClassName)
-        && Objects.equals(this.scopes, other.scopes);
+        && Objects.equals(this.scopes, other.scopes)
+        && Objects.equals(this.defaultScopes, other.defaultScopes);
   }
 
   private void readObject(ObjectInputStream input) throws IOException, ClassNotFoundException {
@@ -438,12 +466,14 @@ private String getDefaultServiceAccount() throws IOException {
   public static class Builder extends GoogleCredentials.Builder {
     private HttpTransportFactory transportFactory;
     private Collection<String> scopes;
+    private Collection<String> defaultScopes;
 
     protected Builder() {}
 
     protected Builder(ComputeEngineCredentials credentials) {
       this.transportFactory = credentials.transportFactory;
       this.scopes = credentials.scopes;
+      this.defaultScopes = credentials.defaultScopes;
     }
 
     public Builder setHttpTransportFactory(HttpTransportFactory transportFactory) {
@@ -453,6 +483,13 @@ public Builder setHttpTransportFactory(HttpTransportFactory transportFactory) {
 
     public Builder setScopes(Collection<String> scopes) {
       this.scopes = scopes;
+      this.defaultScopes = null;
+      return this;
+    }
+
+    public Builder setScopes(Collection<String> scopes, Collection<String> defaultScopes) {
+      this.scopes = scopes;
+      this.defaultScopes = defaultScopes;
       return this;
     }
 
@@ -464,8 +501,12 @@ public Collection<String> getScopes() {
       return scopes;
     }
 
+    public Collection<String> getDefaultScopes() {
+      return defaultScopes;
+    }
+
     public ComputeEngineCredentials build() {
-      return new ComputeEngineCredentials(transportFactory, scopes);
+      return new ComputeEngineCredentials(transportFactory, scopes, defaultScopes);
     }
   }
 }

oauth2_http/java/com/google/auth/oauth2/DefaultCredentialsProvider.java

@@ -301,7 +301,8 @@ private GoogleCredentials tryGetAppEngineCredential() throws IOException {
     if (!onAppEngine) {
       return null;
     }
-    return new AppEngineCredentials(Collections.<String>emptyList());
+    return new AppEngineCredentials(
+        Collections.<String>emptyList(), Collections.<String>emptyList());
   }
 
   private final GoogleCredentials tryGetComputeCredentials(HttpTransportFactory transportFactory) {

oauth2_http/java/com/google/auth/oauth2/GoogleCredentials.java

@@ -235,6 +235,20 @@ public GoogleCredentials createScoped(Collection<String> scopes) {
     return this;
   }
 
+  /**
+   * If the credentials support scopes, creates a copy of the the identity with the specified scopes
+   * and default scopes; otherwise, returns the same instance. This is mainly used by client
+   * libraries.
+   *
+   * @param scopes Collection of scopes to request.
+   * @param defaultScopes Collection of default scopes to request.
+   * @return GoogleCredentials with requested scopes.
+   */
+  public GoogleCredentials createScoped(
+      Collection<String> scopes, Collection<String> defaultScopes) {
+    return this;
+  }
+
   /**
    * If the credentials support scopes, creates a copy of the the identity with the specified
    * scopes; otherwise, returns the same instance.