Add assume role authentication for Redshift

Author: t3t5u

Diff for: embulk-output-redshift/README.md

@@ -24,7 +24,7 @@ Redshift output plugin for Embulk loads records to Redshift.
 - **transaction_isolation**: transaction isolation level for each connection ("read_uncommitted", "read_committed", "repeatable_read" or "serializable"). if not specified, database default value will be used.
 - **access_key_id**: deprecated. `aws_access_key_id` should be used (see "basic" in `aws_auth_method`).
 - **secret_access_key**: deprecated. `aws_secret_access_key` should be used (see "basic" in `aws_auth_method`).
-- **aws_auth_method**: name of mechanism to authenticate requests ("basic", "env", "instance", "profile", "properties", "anonymous", "session" or "default". default: "basic")
+- **aws_auth_method**: name of mechanism to authenticate requests ("basic", "env", "instance", "profile", "properties", "anonymous", "session", "assume_role" or "default". default: "basic")
 
   - "basic": uses `access_key_id` and `secret_access_key` to authenticate.
 
@@ -63,6 +63,14 @@ Redshift output plugin for Embulk loads records to Redshift.
 
     - **aws_session_token**: session token (string, required)
 
+  - "assume_role": uses temporary security credentials created by AssumeRole.
+
+    - **aws_account_id**: AWS account ID (string, required)
+
+    - **aws_role_name**: AWS role name (string, required)
+
+    - **aws_external_id**: External ID (string, required)
+
   - "default": uses AWS SDK's default strategy to look up available credentials from runtime environment. This method behaves like the combination of the following methods.
 
     1. "env"

Diff for: embulk-output-redshift/build.gradle

@@ -15,7 +15,7 @@ dependencies {
         exclude group: "com.fasterxml.jackson.core", module: "jackson-databind"
         exclude group: "com.fasterxml.jackson.core", module: "jackson-core"
     }
-    implementation("org.embulk:embulk-util-aws-credentials:0.4.0") {
+    implementation("org.embulk:embulk-util-aws-credentials:0.4.2") {
         exclude group: "org.slf4j", module: "slf4j-api"
     }
 

Diff for: embulk-output-redshift/gradle.lockfile

@@ -18,15 +18,15 @@ joda-time:joda-time:2.9.2=compileClasspath,runtimeClasspath
 org.apache.httpcomponents:httpclient:4.5.5=compileClasspath,runtimeClasspath
 org.apache.httpcomponents:httpcore:4.4.9=compileClasspath,runtimeClasspath
 org.embulk:embulk-spi:0.10.49=compileClasspath
-org.embulk:embulk-util-aws-credentials:0.4.0=compileClasspath,runtimeClasspath
+org.embulk:embulk-util-aws-credentials:0.4.2=compileClasspath,runtimeClasspath
 org.embulk:embulk-util-config:0.3.3=compileClasspath,runtimeClasspath
 org.embulk:embulk-util-json:0.2.1=compileClasspath,runtimeClasspath
 org.embulk:embulk-util-retryhelper:0.8.2=compileClasspath,runtimeClasspath
 org.embulk:embulk-util-rubytime:0.3.3=compileClasspath,runtimeClasspath
 org.embulk:embulk-util-timestamp:0.2.2=compileClasspath,runtimeClasspath
 org.msgpack:msgpack-core:0.8.24=compileClasspath
 org.postgresql:postgresql:9.4-1205-jdbc41=compileClasspath,runtimeClasspath
-org.slf4j:jcl-over-slf4j:1.7.12=compileClasspath,runtimeClasspath
+org.slf4j:jcl-over-slf4j:1.7.36=compileClasspath,runtimeClasspath
 org.slf4j:slf4j-api:2.0.7=compileClasspath
 software.amazon.ion:ion-java:1.0.2=compileClasspath,runtimeClasspath
 empty=