Refactor extension functions to add_extensions scripts

src/scripts/extensions/blackfire.sh

@@ -0,0 +1,22 @@
+# Function to install blackfire extension.
+add_blackfire() {
+  local extension=$1
+  version=${version:?}
+  no_dot_version=${version/./}
+  platform=$(uname -s | tr '[:upper:]' '[:lower:]')
+  extension_version=$(echo "$extension" | cut -d '-' -f 2)
+  status='Enabled'
+  if ! shared_extension blackfire; then
+    status='Installed and enabled'
+    if [ "$extension_version" = "blackfire" ]; then
+      if [[ ${version:?} =~ 5.[3-6] ]]; then
+        extension_version='1.50.0'
+      else
+        extension_version=$(get -s -n "" https://blackfire.io/api/v1/releases | grep -Eo 'php":"([0-9]+.[0-9]+.[0-9]+)' | cut -d '"' -f 3)
+      fi
+    fi
+    get -q -n "${ext_dir:?}/blackfire.so" https://packages.blackfire.io/binaries/blackfire-php/"$extension_version"/blackfire-php-"$platform"_amd64-php-"$no_dot_version".so >/dev/null 2>&1
+  fi
+  enable_extension blackfire extension
+  add_extension_log blackfire "$status"
+}