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 # gdnotify
-google drive change notifier for AWS
+
+[![Documentation](https://godoc.org/github.com/mashiike/gdnotify?status.svg)](https://godoc.org/github.com/mashiike/gdnotify)
+![Latest GitHub release](https://img.shields.io/github/release/mashiike/gdnotify.svg)
+![Github Actions test](https://github.com/mashiike/gdnotify/workflows/Test/badge.svg?branch=main)
+[![License](https://img.shields.io/badge/license-MIT-blue.svg)](https://github.com/mashiike/gdnotify/blob/master/LICENSE)
+
+`gdnotify` is google drive change notifier for AWS
+
+Changes that occur in Google Drive are notified through Amazon EventBridge.
+
+## Install 
+### Homebrew (macOS and Linux)
+
+```console
+$ brew install mashiike/tap/awstee
+```
+### Binary packages
+
+[Releases](https://github.com/mashiike/awstee/releases)
+
+## Usage with AWS Lambda (serverless)
+
+gdnotify works with AWS Lambda, Amazon EventBridge and Amazon DynamoDB.
+
+Lambda Function requires a webhook and a maintainer
+
+
+```mermaid
+sequenceDiagram
+  autonumber
+  Maintainer lambda function->>+Google API: GET /drive/v3/changes/startPageToken
+  Google API-->>-Maintainer lambda function: PageToken
+  Maintainer lambda function->>+Google API: POST /drive/v3/changes/watch
+  Google API [push]--)Webhook lambda function:  sync request
+  Google API-->>-Maintainer lambda function: response
+  Maintainer lambda function->>+DynamoDB: put item
+  DynamoDB-->>-Maintainer lambda function: response
+  loop
+    Google API [push]->>+Webhook lambda function: change request
+    Webhook lambda function->>+Google API: GET /drive/v3/changes
+    Google API-->>-Webhook lambda function: changes info
+    Webhook lambda function->>+EventBridge: Put Events
+    EventBridge-->>-Webhook lambda function: response
+    Webhook lambda function->>+DynamoDB: update item
+    DynamoDB-->>-Webhook lambda function: response
+    Webhook lambda function->>+Google API [push]: Status Ok
+  end
+```
+
+
+The basic configuration file is as follows:
+```yaml
+required_version: ">=0.0.0"
+
+webhook: "{{ env `WEBHOOK_LAMBDA_URL`}}" #webhook mode lambda function URL
+expiration: 168h
+
+storage:
+  type: DynamoDB
+  table_name: gdnotify # DynamoDB Table Name
+
+notification:
+  type: EventBridge
+  event_bus: gdnotify # Event Bus Name. Although it is possible to use the `default`, it is recommended to create and use a custom event bus.
+
+drives:
+  - drive_id: __default__   # __default__ is a special setting, indicating a drive that is not tied to a specific Drive, 
+                            # but can be sensed with the given permissions. (For example, files that reside in MyDrive)
+  - drive_id: XXXXXXXXXXXXXXXXXXX  # Usually, you should specify the DriveID of the team drive
+```
+
+Let's solidify the Lambda package with the following configuration (runtime `provided.al2`)
+
+```
+lambda.zip
+├── bootstrap    # build binary
+└── config.yaml  # configuration file
+```
+
+A related document is [https://docs.aws.amazon.com/lambda/latest/dg/runtimes-custom.html](https://docs.aws.amazon.com/lambda/latest/dg/runtimes-custom.html)
+
+### Webhook lambda function 
+
+The Webhook's Lambda function receives notifications from the Google API. It then puts the Event into the EventBus of Amazon EventBridge.
+
+Set the following environment variables:
+
+- `GDNOTIFY_RUN_MODE`=webhook
+- `GDNOTIFY_CONFIG`=config.yaml
+
+The required IAM Role permissions are as follows.
+```json
+{
+    "Version": "2012-10-17",
+    "Statement": [
+        {
+            "Sid": "Webhook",
+            "Effect": "Allow",
+            "Action": [
+                "events:PutEvents",
+                "dynamodb:DescribeTable",
+                "dynamodb:GetItem",
+                "dynamodb:UpdateItem"
+            ],
+            "Resource": [
+                "*"
+            ]
+        }
+    ]
+}
+```
+
+It is necessary to set up a Lambda Function URL, or API gateway, ALB, etc.
+Here, the Lambda Function URL is assumed to be simple.
+lambda function URLs document is [https://docs.aws.amazon.com/lambda/latest/dg/lambda-urls.html](https://docs.aws.amazon.com/lambda/latest/dg/lambda-urls.html)
+Suppose you get the following URL: `https://xxxxxxxxxxxx.lambda-url.ap-northeast-1.on.aws`
+
+### Maintainer lambda function
+Maintainer's Lambda function registers a notification channel with the Google API. It is assumed that this Lambda function will be called at regular intervals to perform maintenance tasks such as re-registering those newly added to the monitoring or those about to expire at that time.
+
+Set the following environment variables:
+
+- `GDNOTIFY_RUN_MODE`=maintainer
+- `GDNOTIFY_CONFIG`=config.yaml
+- `WEBHOOK_LAMBDA_URL`=https://xxxxxxxxxxxx.lambda-url.ap-northeast-1.on.aws
+
+The required IAM Role permissions are as follows.
+```json
+{
+    "Version": "2012-10-17",
+    "Statement": [
+        {
+            "Sid": "Webhook",
+            "Effect": "Allow",
+            "Action": [
+                "dynamodb:CreateTable",
+                "dynamodb:PutItem",
+                "dynamodb:DeleteItem",
+                "dynamodb:Scan"
+            ],
+            "Resource": [
+                "*"
+            ]
+        }
+    ]
+}
+```
+
+EventBridge scheduling rules are required.
+The following tutorial will help you set it up. https://docs.aws.amazon.com/eventbridge/latest/userguide/eb-run-lambda-schedule.html
+
+## Usage as CLI
+
+```shell
+gdnotify -config <config file> [options] [command]
+version: v0.0.0
+
+commands:
+   list          list notification channels
+   serve         serve webhook server
+   register      register a new notification channel for a drive for which a notification channel has not yet been set
+   maintenance   re-register expired notification channels or register new unregistered channels.
+   cleanup       remove all notification channels
+
+options:
+  -config value
+        config list
+  -log-level string
+        run mode (default "info")
+  -port int
+        webhook httpd port
+  -run-mode string
+        run mode (cli|webhook|maintainer) (default "cli")
+```
+
+## For Local Development
+
+```yaml
+required_version: ">=0.0.0"
+
+webhook: "{{ env `HTTP_TUNNEL_URL` }}"
+expiration: 168h
+
+storage:
+  type: File
+  data_file: data/storage.gob
+
+notification:
+  type: File
+  event_file: data/events.json
+
+drives:
+  - drive_id: __default__
+```
+
+It can be run locally using the cloudflare tunnel command or ngrok.
+For example
+
+```shell
+$ HTTP_TUNNEL="cloudflared tunnel --url localhost{{ .Address }}" GDNOTIFY_RUN_MODE=webhook go run cmd/gdnotify/main.go -config local.yaml -log-level debug
+```
+
+see `tunnel.log`, get tunnel url 
+
+```shell 
+$  HTTP_TUNNEL_URL="https://..." go run cmd/gdnotify/main.go -config my-local/local.yaml -log-level debug maintenance
+$  HTTP_TUNNEL_URL="https://..." go run cmd/gdnotify/main.go -config my-local/local.yaml -log-level debug list
+$  HTTP_TUNNEL_URL="https://..." go run cmd/gdnotify/main.go -config my-local/local.yaml -log-level debug cleanup
+```
+
+## LICENSE
+
+MIT License
+
+Copyright (c) 2022 IKEDA Masashi