Post-GA nits (#1040)

* Fixes keyFactory type for ES vs EC keys in HTTP example (MQTT was done before) and adds more comprehensive examples to README * Correct environment variable and improved style in manager examples.
GoogleCloudPlatform · Mar 16, 2018 · 5710148 · 5710148
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diff --git a/iot/api-client/manager/README.md b/iot/api-client/manager/README.md
@@ -8,6 +8,10 @@ This sample app demonstrates device management for Google Cloud IoT Core.
 Note that before you can run the sample, you must configure a Google Cloud
 PubSub topic for Cloud IoT as described in [the parent README](../README.md).
 
+Before running the samples, you can set the `GOOGLE_CLOUD_PROJECT` and
+`GOOGLE_APPLICATION_CREDENTIALS` environment variables to avoid passing them to
+the sample every time you run it.
+
 ## Setup
 Run the following command to install the libraries and build the sample with
 Maven:
@@ -24,7 +28,7 @@ The following description summarizes the sample usage:
 
     Cloud IoT Core Commandline Example (Device / Registry management):
 
-    --cloud_region <arg>           GCP cloud region.
+    --cloud_region <arg>           GCP cloud region (default us-central1).
     --command <arg>                Command to run:
                                    create-iot-topic
                                    create-rsa
@@ -58,85 +62,109 @@ run the sample as:
 Create a PubSub topic, `hello-java`, for the project, `blue-jet-123`:
 
     mvn exec:java \
-        -Dexec.mainClass="com.example.cloud.iot.examples.DeviceRegistryExample" \
-        -Dexec.args="-project_id=blue-jet-123 \
-                     -command=create-iot-topic \
-                     -pubsub_topic=hello-java "
+      -Dexec.mainClass="com.example.cloud.iot.examples.DeviceRegistryExample" \
+      -Dexec.args="-project_id=blue-jet-123 \
+                   -command=create-iot-topic \
+                   -pubsub_topic=hello-java"
 
 Create an ES device:
 
-    java -cp target/cloudiot-manager-demo-1.0-jar-with-dependencies.jar \
-        com.example.cloud.iot.examples.DeviceRegistryExample \
-        -project_id=blue-jet-123 -pubsub_topic=hello-java \
-        -registry_name=hello-java -ec_public_key_file ../ec_public.pem \
-        -device_id="java-device-0" -command=create-es
+    mvn exec:java \
+      -Dexec.mainClass="com.example.cloud.iot.examples.DeviceRegistryExample" \
+      -Dexec.args="-project_id=blue-jet-123 \
+                   -pubsub_topic=hello-java \
+                   -cloud_region=us-central1 \
+                   -registry_name=hello-java \
+                   -ec_public_key_file ../ec_public.pem \
+                   -device_id=java-device-0 \
+                   -command=create-es"
 
 Create an RSA device:
 
-    java -cp target/cloudiot-manager-demo-1.0-jar-with-dependencies.jar \
-        com.example.cloud.iot.examples.DeviceRegistryExample \
-        -project_id=blue-jet-123 -pubsub_topic=hello-java \
-        -registry_name=hello-java -rsa_certificate_file ../rsa_cert.pem \
-        -device_id="java-device-1" -command=create-rsa
+    mvn exec:java \
+      -Dexec.mainClass="com.example.cloud.iot.examples.DeviceRegistryExample" \
+      -Dexec.args="-project_id=blue-jet-123 \
+                   -pubsub_topic=hello-java \
+                   -registry_name=hello-java \
+                   -rsa_certificate_file ../rsa_cert.pem \
+                   -device_id=java-device-1 \
+                   -command=create-rsa"
 
 Create a device without authorization:
 
-    java -cp target/cloudiot-manager-demo-1.0-jar-with-dependencies.jar \
-        com.example.cloud.iot.examples.DeviceRegistryExample \
-        -project_id=blue-jet-123 -pubsub_topic=hello-java \
-        -registry_name=hello-java -device_id="java-device-3" \
-        -command=create-unauth
+    mvn exec:java \
+      -Dexec.mainClass="com.example.cloud.iot.examples.DeviceRegistryExample" \
+      -Dexec.args="-project_id=blue-jet-123 \
+                   -pubsub_topic=hello-java \
+                   -registry_name=hello-java \
+                   -device_id=java-device-3 \
+                   -command=create-unauth"
 
 Create a device registry:
 
-    java -cp target/cloudiot-manager-demo-1.0-jar-with-dependencies.jar \
-        com.example.cloud.iot.examples.DeviceRegistryExample \
-        -project_id=blue-jet-123 -pubsub_topic=hello-java \
-        -registry_name=hello-java -command=create-registry
+    mvn exec:java \
+      -Dexec.mainClass="com.example.cloud.iot.examples.DeviceRegistryExample" \
+      -Dexec.args="-project_id=blue-jet-123 \
+                   -pubsub_topic=hello-java \
+                   -registry_name=hello-java \
+                   -command=create-registry"
 
 Delete a device registry:
 
-    java -cp target/cloudiot-manager-demo-1.0-jar-with-dependencies.jar \
-        com.example.cloud.iot.examples.DeviceRegistryExample \
-        -project_id=blue-jet-123 -pubsub_topic=hello-java \
-        -registry_name=hello-java -command=delete-registry
+    mvn exec:java \
+      -Dexec.mainClass="com.example.cloud.iot.examples.DeviceRegistryExample" \
+      -Dexec.args="-project_id=blue-jet-123 \
+                   -pubsub_topic=hello-java \
+                   -registry_name=hello-java \
+                   -command=delete-registry"
 
 Get a device registry:
 
-    java -cp target/cloudiot-manager-demo-1.0-jar-with-dependencies.jar \
-        com.example.cloud.iot.examples.DeviceRegistryExample \
-        -project_id=blue-jet-123 -pubsub_topic=hello-java \
-        -registry_name=hello-java -command=get-registry
+    mvn exec:java \
+      -Dexec.mainClass="com.example.cloud.iot.examples.DeviceRegistryExample" \
+      -Dexec.args="-project_id=blue-jet-123 \
+                   -pubsub_topic=hello-java \
+                   -registry_name=hello-java \
+                   -command=get-registry"
 
 List devices:
 
-    java -cp target/cloudiot-manager-demo-1.0-jar-with-dependencies.jar \
-        com.example.cloud.iot.examples.DeviceRegistryExample \
-        -project_id=blue-jet-123 -pubsub_topic=hello-java \
-        -registry_name=hello-java -command=list-devices
+    mvn exec:java \
+      -Dexec.mainClass="com.example.cloud.iot.examples.DeviceRegistryExample" \
+      -Dexec.args="-project_id=blue-jet-123 \
+                   -pubsub_topic=hello-java \
+                   -registry_name=hello-java \
+                   -command=list-devices"
 
 List device registries:
 
-    java -cp target/cloudiot-manager-demo-1.0-jar-with-dependencies.jar \
-        com.example.cloud.iot.examples.DeviceRegistryExample \
-        -project_id=blue-jet-123 -pubsub_topic=hello-java \
-        -registry_name=hello-java -command=list-registries
+    mvn exec:java \
+      -Dexec.mainClass="com.example.cloud.iot.examples.DeviceRegistryExample" \
+      -Dexec.args="-project_id=blue-jet-123 \
+                   -pubsub_topic=hello-java \
+                   -registry_name=hello-java \
+                   -command=list-registries"
 
 Patch a device with ES:
 
-    java -cp target/cloudiot-manager-demo-1.0-jar-with-dependencies.jar \
-        com.example.cloud.iot.examples.DeviceRegistryExample \
-        -project_id=blue-jet-123 -pubsub_topic=hello-java \
-        -registry_name=hello-java -ec_public_key_file ../ec_public.pem \
-        -device_id="java-device-1" -command=patch-device-es
+    mvn exec:java \
+      -Dexec.mainClass="com.example.cloud.iot.examples.DeviceRegistryExample" \
+      -Dexec.args="-project_id=blue-jet-123 \
+                   -pubsub_topic=hello-java \
+                   -registry_name=hello-java \
+                   -ec_public_key_file ../ec_public.pem \
+                   -device_id=java-device-1 -command=patch-device-es"
 
 Patch a device with RSA:
 
-    java -cp target/cloudiot-manager-demo-1.0-jar-with-dependencies.jar \
-        com.example.cloud.iot.examples.DeviceRegistryExample \
-        -project_id=blue-jet-123 -pubsub_topic=hello-java \
-        -registry_name=hello-java -rsa_certificate_file ../rsa_cert.pem \
-        -device_id="java-device-0" -command=patch-device-rsa
+    mvn exec:java \
+      -Dexec.mainClass="com.example.cloud.iot.examples.DeviceRegistryExample" \
+      -Dexec.args="-project_id=blue-jet-123 \
+                   -pubsub_topic=hello-java \
+                   -registry_name=hello-java \
+                   -rsa_certificate_file ../rsa_cert.pem \
+                   -device_id=java-device-0 \
+                   -command=patch-device-rsa"
 
 
 # Cloud IoT Core Java HTTP example
@@ -169,16 +197,17 @@ The following command summarizes the sample usage:
                      -algorithm=<RS256|ES256>"
 ```
 
-For example, if your project ID is `blue-jet-123`, your service account
-credentials are stored in your home folder in creds.json and you have generated
-your credentials using the [`generate_keys.sh`](../generate_keys.sh) script
+For example, if your project ID is `blue-jet-123`, the Cloud region associated
+with your device registry is europe-west1, and you have generated your
+credentials using the [`generate_keys.sh`](../generate_keys.sh) script
 provided in the parent folder, you can run the sample as:
 
 ```
     mvn exec:java \
         -Dexec.mainClass="com.example.cloud.iot.examples.HttpExample" \
         -Dexec.args="-project_id=blue-jet-123 \
                      -registry_id=my-registry \
+                     -cloud_region=europe-west1 \
                      -device_id=my-java-device \
                      -private_key_file=../rsa_private_pkcs8 \
                      -algorithm=RS256"
@@ -191,6 +220,7 @@ To publish state messages, run the sample as follows:
         -Dexec.mainClass="com.example.cloud.iot.examples.HttpExample" \
         -Dexec.args="-project_id=blue-jet-123 \
                      -registry_id=my-registry \
+                     -cloud_region=us-central1 \
                      -device_id=my-java-device \
                      -private_key_file=../rsa_private_pkcs8 \
                      -message_type=state \
@@ -238,19 +268,21 @@ The following command summarizes the sample usage:
         -Dexec.mainClass="com.example.cloud.iot.examples.MqttExample" \
         -Dexec.args="-project_id=my-iot-project \
                      -registry_id=my-registry \
+                     -cloud_region=us-central1 \
                      -device_id=my-device \
                      -private_key_file=rsa_private_pkcs8 \
                      -algorithm=RS256"
 
-For example, if your project ID is `blue-jet-123`, your service account
-credentials are stored in your home folder in creds.json and you have generated
-your credentials using the [`generate_keys.sh`](../generate_keys.sh) script
+For example, if your project ID is `blue-jet-123`, your device registry is
+located in the `asia-east1` region, and you have generated your
+credentials using the [`generate_keys.sh`](../generate_keys.sh) script
 provided in the parent folder, you can run the sample as:
 
     mvn exec:java \
         -Dexec.mainClass="com.example.cloud.iot.examples.MqttExample" \
         -Dexec.args="-project_id=blue-jet-123 \
                      -registry_id=my-registry \
+                     -cloud_region=asia-east1 \
                      -device_id=my-device \
                      -private_key_file=../rsa_private_pkcs8 \
                      -algorithm=RS256"

diff --git a/iot/api-client/manager/src/main/java/com/example/cloud/iot/examples/HttpExample.java b/iot/api-client/manager/src/main/java/com/example/cloud/iot/examples/HttpExample.java
@@ -102,7 +102,7 @@ private static String createJwtEs(String projectId, String privateKeyFile) throw
 
     byte[] keyBytes = Files.readAllBytes(Paths.get(privateKeyFile));
     PKCS8EncodedKeySpec spec = new PKCS8EncodedKeySpec(keyBytes);
-    KeyFactory kf = KeyFactory.getInstance("ES256");
+    KeyFactory kf = KeyFactory.getInstance("EC");
 
     return jwtBuilder.signWith(SignatureAlgorithm.ES256, kf.generatePrivate(spec)).compact();
   }