Add a secure backup service client.

service/src/main/java/org/whispersystems/textsecuregcm/configuration/SecureBackupServiceConfiguration.java

@@ -6,7 +6,11 @@
 package org.whispersystems.textsecuregcm.configuration;
 
 import com.fasterxml.jackson.annotation.JsonProperty;
+import javax.validation.Valid;
+import javax.validation.constraints.NotBlank;
 import javax.validation.constraints.NotEmpty;
+import javax.validation.constraints.NotNull;
+import com.google.common.annotations.VisibleForTesting;
 import org.apache.commons.codec.DecoderException;
 import org.apache.commons.codec.binary.Hex;
 
@@ -16,8 +20,51 @@ public class SecureBackupServiceConfiguration {
   @JsonProperty
   private String userAuthenticationTokenSharedSecret;
 
+  @NotBlank
+  @JsonProperty
+  private String uri;
+
+  @NotBlank
+  @JsonProperty
+  private String backupCaCertificate;
+
+  @NotNull
+  @Valid
+  @JsonProperty
+  private CircuitBreakerConfiguration circuitBreaker = new CircuitBreakerConfiguration();
+
+  @NotNull
+  @Valid
+  @JsonProperty
+  private RetryConfiguration retry = new RetryConfiguration();
+
   public byte[] getUserAuthenticationTokenSharedSecret() throws DecoderException {
     return Hex.decodeHex(userAuthenticationTokenSharedSecret.toCharArray());
   }
 
+  @VisibleForTesting
+  public void setUri(final String uri) {
+    this.uri = uri;
+  }
+
+  public String getUri() {
+    return uri;
+  }
+
+  @VisibleForTesting
+  public void setBackupCaCertificate(final String backupCaCertificate) {
+    this.backupCaCertificate = backupCaCertificate;
+  }
+
+  public String getBackupCaCertificate() {
+    return backupCaCertificate;
+  }
+
+  public CircuitBreakerConfiguration getCircuitBreakerConfiguration() {
+    return circuitBreaker;
+  }
+
+  public RetryConfiguration getRetryConfiguration() {
+    return retry;
+  }
 }