docs: add support for docs versioning (#1239)

.github/workflows/on-doc-merge.yml

@@ -0,0 +1,21 @@
+name: Docs
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - "docs/**"
+      - "mkdocs.yml"
+
+jobs:
+  release-docs:
+    permissions:
+      contents: write
+      pages: write
+      id-token: write
+    secrets: inherit
+    uses: ./.github/workflows/reusable-publish-docs.yml
+    with:
+      version: main
+      alias: stage

.github/workflows/rebuild-latest-docs.yml

@@ -0,0 +1,39 @@
+name: Rebuild latest docs
+
+# PROCESS
+#
+# 1. Build User Guide and API docs
+# 2. Publish to GitHub Pages
+# 3. Publish to S3 (new home)
+
+# USAGE
+#
+# Only used for deploying a documentation hotfix to /latest and its associated version w/o a full release.
+#
+# Steps:
+#
+# 1. Trigger "Rebuild latest docs" workflow manually: https://docs.github.com/en/actions/managing-workflow-runs/manually-running-a-workflow
+# 2. Use the latest version released under Releases e.g. 2.0.0
+
+on:
+  workflow_dispatch:
+    inputs:
+      latest_published_version:
+        description: "Latest published version to rebuild latest docs for, e.g. 1.4.2"
+        default: "1.4.2"
+        required: true
+
+permissions:
+  contents: read
+
+jobs:
+  release-docs:
+    permissions:
+      contents: write  # push to gh-pages
+      pages: write     # deploy gh-pages website
+      id-token: write  # trade JWT token for AWS credentials in AWS Docs account
+    secrets: inherit
+    uses: ./.github/workflows/reusable_publish_docs.yml
+    with:
+      version: ${{ inputs.latest_published_version }}
+      alias: latest

.github/workflows/reusable-publish-docs.yml

@@ -0,0 +1,126 @@
+name: Reusable Publish docs
+
+env:
+  BRANCH: main
+  ORIGIN: aws-powertools/powertools-lambda-java
+  VERSION: ""
+
+on:
+  workflow_call:
+    inputs:
+      version:
+        description: "Version to build and publish docs (1.28.0, develop)"
+        required: true
+        type: string
+      alias:
+        description: "Alias to associate version (latest, stage)"
+        required: true
+        type: string
+      detached_mode:
+        description: "Whether it's running in git detached mode to ensure git is sync'd"
+        required: false
+        default: false
+        type: boolean
+
+permissions:
+  contents: write
+  id-token: write
+  pages: write
+
+jobs:
+  publish-docs:
+    runs-on: ubuntu-latest
+    environment: Docs
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@8e5e7e5ab8b370d6c329ec480221332ada57f0ab  # v3.5.2
+        with:
+          # While `fetch-depth` is used to allow the workflow to later commit & push the changes.
+          fetch-depth: 0
+      - name: Setup dependencies
+        uses: ./.github/actions/cached-node-modules
+      - name: Set up Python
+        uses: actions/setup-python@57ded4d7d5e986d7296eab16560982c6dd7c923b # v4.6.0
+        with:
+          python-version: "3.8"
+      - name: Install doc generation dependencies
+        run: |
+          pip install --upgrade pip 
+          pip install -r docs/requirements.txt
+      - name: Setup doc deploy
+        run: |
+          git config --global user.name Docs deploy
+          git config --global user.email aws-devax-open-source@amazon.com
+      - name: Git refresh tip (detached mode)
+        # Git Detached mode (release notes) doesn't have origin
+        if: ${{ inputs.detached_mode }}
+        run: |
+          git config pull.rebase true
+          git config remote.origin.url >&- || git remote add origin https://github.com/"$ORIGIN"
+          git pull origin "$BRANCH"
+      - name: Normalize Version Number
+        run: echo "VERSION=$(echo ${{ inputs.version }} | sed 's/v//')" >> $GITHUB_ENV
+      - name: Build docs website and API reference
+        env:
+          ALIAS: ${{ inputs.alias }}
+        run: |
+          rm -rf site
+          mkdocs build
+          mike deploy --update-aliases --no-redirect ${{ env.VERSION }} ${{ env.ALIAS }} --branch backup-gh-pages
+          # Set latest version as a default
+          mike set-default latest --branch backup-gh-pages
+      - name: Configure AWS credentials
+        uses: aws-actions/configure-aws-credentials@e1e17a757e536f70e52b5a12b2e8d1d1c60e04ef # v2.0.0
+        with:
+          aws-region: us-east-1
+          role-to-assume: ${{ secrets.AWS_DOCS_ROLE_ARN }}
+      - name: Copy API Docs
+        run: |
+          cp -r api site/
+
+## Uncomment to deploy to s3
+#      - name: Deploy Docs (Version)
+#        env:
+#          VERSION: ${{ inputs.version }}
+#          ALIAS: ${{ inputs.alias }}
+#        run: |
+#          aws s3 sync \
+#            site/ \
+#            s3://${{ secrets.AWS_DOCS_BUCKET }}/lambda-java/${{ env.VERSION }}/
+#      - name: Deploy Docs (Alias)
+#        env:
+#          VERSION: ${{ inputs.version }}
+#          ALIAS: ${{ inputs.alias }}
+#        run: |
+#          aws s3 sync \
+#            site/ \
+#            s3://${{ secrets.AWS_DOCS_BUCKET }}/lambda-java/${{ env.ALIAS }}/
+#      - name: Deploy Docs (Version JSON)
+#        env:
+#          VERSION: ${{ inputs.version }}
+#          ALIAS: ${{ inputs.alias }}
+
+
+        # We originally used "mike" from PyPi to manage versions for us, but since we moved to S3, we can't use it to manage versions any more.
+        # Instead, we're using some shell script that manages the versions.
+        #
+        # Operations:
+        #   1. Download the versions.json file from S3
+        #   2. Find any reference to the alias and delete it from the versions file
+        #   3. This is voodoo (don't use JQ):
+        #      - we assign the input as $o and the new version/alias as $n, 
+        #      - we check if the version number exists in the file already (for republishing docs)
+        #      - if it's an alias (stage/latest/*) or old version, we do nothing and output $o (original input)
+        #      - if it's a new version number, we add it at position 0 in the array.
+        #   4. Once done, we'll upload it back to S3.
+
+## Uncomment to deploy to s3
+#        run: |
+#          aws s3 cp \
+#            s3://${{ secrets.AWS_DOCS_BUCKET }}/lambda-java/versions.json \
+#            versions_old.json
+#          jq 'del(.[].aliases[] | select(. == "${{ env.ALIAS }}"))' < versions_old.json > versions_proc.json
+#          jq '. as $o | [{"title": "${{ env.VERSION }}", "version": "${{ env.VERSION }}", "aliases": ["${{env.ALIAS}}"] }] as $n | $n | if .[0].title | test("[a-z]+") or any($o[].title == "${{ env.VERSION }}";.) then $o else $n + $o end' < versions_proc.json > versions.json
+#          aws s3 cp \
+#            versions.json \
+#            s3://${{ secrets.AWS_DOCS_BUCKET }}/lambda-java/versions.json

mkdocs.yml

@@ -82,6 +82,9 @@ extra_javascript:
   - javascript/extra.js
 
 extra:
+  version:
+    provider: mike
+    default: latest
   powertools:
     version: 1.16.0 # to update after each release (we do not want snapshot version here)