Adds action for building tracker js files (#15542)

This action will make it possible to automatically update the minified tracker js files.
It is triggered with a comment "build js" within a Pull Request.

It (currently) only works for Pull Requests that are based on a local branch.

1 files changed, 82 insertions, 0 deletions

diff --git a/.github/workflows/buildtrackerjs.yml b/.github/workflows/buildtrackerjs.yml
new file mode 100644
index 0000000000..f8c60c6a28
--- /dev/null
+++ b/.github/workflows/buildtrackerjs.yml
@@ -0,0 +1,82 @@
+name: Build Tracker JS files
+
+on:
+  issue_comment:
+    types: [created]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Detect branch for PR
+      id: vars
+      run: |
+        PR=$( echo "${{ github.event.comment.issue_url }}" | grep -oE 'issues/([0-9]+)$' | cut -d'/' -f 2 )
+        
+        PR_INFO=$( curl \
+                 --request GET \
+                 --header 'authorization: Bearer ${{ secrets.GITHUB_TOKEN }}' \
+                 --header 'content-type: application/json' \
+                 --url https://api.github.com/repos/$GITHUB_REPOSITORY/pulls/$PR )
+        REF=$(echo "${PR_INFO}" | jq -r .head.ref)
+        BASE=$(echo "${PR_INFO}" | jq -r .base.repo.full_name)
+        STATE=$(echo "${PR_INFO}" | jq -r .state)
+        
+        if [[ $STATE == "closed" ]]
+        then
+          echo "Pull Request already closed."
+          exit 0;
+        fi
+        
+        if [[ $BASE != $GITHUB_REPOSITORY ]]
+        then
+          echo "It's only possible to update local branches"
+          exit 0;
+        fi
+        
+        echo ::set-output name=branch::$REF
+    - uses: actions/setup-java@v1
+      with:
+        java-version: 9
+      if: steps.vars.outputs.branch != ''
+    - uses: actions/checkout@v2
+      with:
+        ref: ${{ steps.vars.outputs.branch }}
+        lfs: false
+      if: steps.vars.outputs.branch != ''
+    - name: Prepare git config
+      run: | 
+          cat <<- EOF > $HOME/.netrc
+            machine github.com
+            login $GITHUB_ACTOR
+            password $GITHUB_TOKEN
+            machine api.github.com
+            login $GITHUB_ACTOR
+            password $GITHUB_TOKEN
+          EOF
+          chmod 600 $HOME/.netrc
+          git config --global user.email "$GITHUB_ACTOR@users.noreply.github.com"
+          git config --global user.name "$GITHUB_ACTOR"
+      if: steps.vars.outputs.branch != ''
+    - name: Fetch YUICompressor
+      run: |
+        cd $GITHUB_WORKSPACE/js
+        wget https://github.com/yui/yuicompressor/releases/download/v2.4.8/yuicompressor-2.4.8.zip
+        unzip yuicompressor-2.4.8.zip
+      if: steps.vars.outputs.branch != ''
+    - name: Build JS files
+      run: |
+        cd $GITHUB_WORKSPACE/js
+        sed '/<DEBUG>/,/<\/DEBUG>/d' < piwik.js | sed 's/eval/replacedEvilString/' | java -jar yuicompressor-2.4.8.jar --type js --line-break 1000 | sed 's/replacedEvilString/eval/' | sed 's/^[/][*]/\/*!/' > piwik.min.js && cp piwik.min.js ../piwik.js && cp piwik.min.js ../matomo.js
+      if: steps.vars.outputs.branch != ''
+    - name: Push changes
+      run: |
+          if [[ $( git diff --numstat ) ]]
+          then
+            cd $GITHUB_WORKSPACE
+            git add piwik.js matomo.js js/piwik.min.js
+            git commit -m "rebuilt piwik.js"
+            git push
+          fi
+      if: steps.vars.outputs.branch != ''