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+# Deploy to an S3 bucket from GitHub
+
+This guide gives a quick, secure way to build a simple static website in GitHub, and deploy it to an S3 bucket in AWS.
+
+For that to work, GitHub needs permissions on the S3 bucket. The standard approach is to use a specific AWS access_key and secret_token. But, even if you use GitHub Secrets, you're still then exposing an access token to GitHub.
+
+OIDC is an alternative approach whereby GitHub gets granted temporary access to a specific role in AWS. This further lets you limit that role using IAM: to specific buckets and actions.
+
+The process flow for OIDC is:
+
+1. GitHub Action triggers from your git commit
+2. GitHub Action assumes a role in AWS
+3. (behind the scenes, GitHub and AWS use OIDC: exchanging JWT tokens to grant GitHub temporary access to a specific role in AWS)
+4. GitHub Action uses that role to copy files into an S3 bucket
+
+One-time setup to get this working:
+
+1. Define GitHub as an Identity Provider in your AWS account
+2. Define what GitHub is allowed to do (IAM Role Policy)
+3. Define the GitHub role (IAM Role)
+4. Hook this into your GitHub Action
+
+NB: You should script as much of this as possible, where it is safe to do so.
+
+## Define GitHub as an identity provider in your AWS account
+
+This is done by adding GitHub as an IdP Provider in AWS.
+
+Follow steps to create IdP provider:
+<https://docs.github.com/en/actions/deployment/security-hardening-your-deployments/configuring-openid-connect-in-amazon-web-services>
+
+## Define what GitHub is allowed to do
+
+This is done by creating an AWS Role Profile, stating exactly which buckets GitHub will be allowed to deploy into.
+
+Create new Policy ("GitHubS3DeployPolicy")
+
+```json
+{
+    "Version": "2012-10-17",
+    "Statement": [
+        {
+            "Effect": "Allow",
+            "Action": [
+                "s3:*",
+                "s3-object-lambda:*"
+            ],
+            "Resource": [
+                "arn:aws:s3:::your-s3-bucket/*",
+                "arn:aws:s3:::your-s3-bucket"
+            ]
+        }
+    ]
+}
+```
+
+## Define the GitHub role
+
+This is the role that GitHub will assume. It:
+
+- Links to the policy created early
+- Links to the github OIDC created early
+- Explicitly states which GitHub repo, and branches are permitted
+
+This page includes many options, including using Cognito, etc.
+<https://docs.aws.amazon.com/IAM/latest/UserGuide/id_roles_create_for-idp_oidc.html>
+
+Below is a full, simple example that doesn't use Cognito.
+
+Create a new Role ("GitHubS3DeployRole")
+Trust policy:
+
+```json
+{
+  "Version": "2012-10-17",
+  "Statement": [
+    {
+      "Effect": "Allow",
+      "Principal": {
+        "Federated": "arn:aws:iam::<YOUR_AWS_ACCOUNT_NUMBER>:oidc-provider/token.actions.githubusercontent.com"
+      },
+      "Action": "sts:AssumeRoleWithWebIdentity",
+      "Condition": {
+        "StringEquals": {
+          "token.actions.githubusercontent.com:aud": "sts.amazonaws.com",
+          "token.actions.githubusercontent.com:sub": "repo:<YOUR_GITHUB_ORG>/<YOUR_GITHUB_REPO>:ref:refs/heads/main"
+        }
+      }
+    }
+  ]
+}
+```
+
+Attach the policy created earlier ("GitHubS3DeployPolicy")
+
+## Hook this into your GitHub Action
+
+Define two GitHub Secrets to hold the ASSUME_ROLE_ARN ("GitHubS3DeployRole" from earlier) and AWS_S3_BUCKET_NAME.
+Use "aws-actions/configure-aws-credentials@v2" to assume that role.
+Example below just syncs two folders into the s3 bucket.
+
+```yaml
+name: deploy-app
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  build:
+    permissions:
+        id-token: write
+        contents: read
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Authenticate with AWS over OIDC
+        uses: aws-actions/configure-aws-credentials@v2
+        with:
+          role-to-assume: ${{ secrets.ASSUME_ROLE_ARN }}
+          role-session-name: mysessionname
+          aws-region: eu-west-2
+      - name: Copy files to the s3 website content bucket
+        run:
+          aws s3 sync myfolder s3://${{ secrets.AWS_S3_BUCKET_NAME }}/myfolder
+          aws s3 sync myotherfolder s3://${{ secrets.AWS_S3_BUCKET_NAME }}/myotherfolder
+```
+
+All done!
+
+## Testing
+
+Some basic test cases below to make sure you've secured this properly. Add your own too.
+You should look to automate these where possible.
+I've included my specific tests, and results - may be some helpful notes in there.
+
+```text
+Ensure success:
+- GitHub: edit "view-stack/index.html"
+- Commit to "main" branch
+- Expecting:
+  - Build should clearly pass
+  - Build should be quick (<10 min)
+  - Bucket contents updated
+  - Bucket timestamp updated
+  - No previous version stored in bucket (we're not versionsing)
+- RESULT: PASS. Took 21 seconds, 18 of those in copying the files. Expect that to grow as files get bigger, but remain under 10 mins. Add a timeout to the GitHub action to enforce that time limit.
+
+Ensure GitHub Action: only triggers on "main" branch:
+- GitHub: make a new branch and commit
+- Expecting:
+  - Action does NOT trigger
+  - S3 bucket is not updated
+- Because:
+  - Should only trigger on "main" branch (ci.yml:  on:push:branches: - main)
+- RESULT: PASS
+
+Ensure Role Policy: fails when has wrong S3 bucket name:
+- AWS: edit "GitHubS3DeployPolicy". Change S3 bucket name to something random.
+- Kick off another github workflow on "main"
+- Expecting:
+  - Build should clearly fail
+  - Nothing redeployed to S3 bucket
+- Because:
+  - Role Policy says explicitly which bucket name this role is allowed to deploy into
+  - Auth should still work, but aws s3 command should fail with access denied.
+- RESULT: PASS
+  - Run aws s3 sync view-stack s3://***/view-stack
+  10fatal error: An error occurred (AccessDenied) when calling the ListObjectsV2 operation: Access Denied
+  11Error: Process completed with exit code 1.
+
+Ensure Role: fails when has wrong GitHub Repo name:
+- AWS: edit "GitHubS3DeployRole" Trust Policy. Change GitHub Repo in "token.actions.githubusercontent.com:sub" to something random: "repo:NHSDigitalWRONG/tech-radar:ref:refs/heads/main"
+- Kick off another github workflow on "main"
+- Expecting:
+  - Build should clearly fail
+  - Nothing redeployed to S3 bucket
+- Because:
+  - Role's trust policy says explicitly which GitHub repo is allowed to use this role
+- RESULT: PASS, with notes:
+  - Authentication failed: Error: Not authorized to perform sts:AssumeRoleWithWebIdentity
+  - But took 2min, seemed to be timing out / retrying
+
+Ensure Role fails when has wrong GitHub Branch name:
+- AWS: edit "GitHubS3DeployRole" Trust Policy. Change GitHub branch in "token.actions.githubusercontent.com:sub" to something random: "repo:NHSDigital/tech-radar:ref:refs/heads/mainWRONG"
+- Kick off another github workflow on "main"
+- Expecting:
+  - Workflow SHOULD still trigger (GitHub action still has "main" as the branch to trigger on)
+  - Build should clearly fail
+  - Nothing redeployed to S3 bucket
+- Because:
+  - Role's trust policy says explicitly which branches of the GitHub repo are allowed to use this role
+- RESULT: PASS, with notes:
+  - Authentication failed: Error: Not authorized to perform sts:AssumeRoleWithWebIdentity
+  - But took 2min, seemed to be timing out / retrying
+```