browser extension binaries are cached in the emsdk image to simplify testing

scripts/bash/npm-helpers/npm_download_browser_extensions.sh

+#!/bin/bash
+set -xeuo pipefail
+
+SCRIPTPATH="$( cd -- "$(dirname "$0")" >/dev/null 2>&1 ; pwd -P )"
+
+TARGET_DIR=${1:?"Missing arg #1 to specify target directory to save downloaded files"}
+
+abs_target_dir=`realpath -m --relative-base="$SCRIPTPATH" "$TARGET_DIR"`
+TARGET_DIR="${abs_target_dir}"
+
+mkdir -vp "${TARGET_DIR}"
+
+pushd "${TARGET_DIR}"
+
+declare -A EXTENSION_LIST=(
+  ["Hive-Keychain"]="jcacnejopjdphbnjgfaaobbfafkihpep"
+  ["Meta-mask"]="nkbihfbeogaeaoehlefnkodbefgpgknn"
+) 
+
+for i in "${!EXTENSION_LIST[@]}"; do
+    # echo "Key: $i value: ${EXTlist[$i]}"
+    extensionName=$i
+    extensionID=${EXTENSION_LIST[$i]}
+
+    # we could try to use Chrome documented way to specify extensions to be automatically installed, but it is not honored in headless version of Chromium
+    # https://developer.chrome.com/docs/extensions/how-to/distribute/install-extensions#preference-linux
+    #echo '{"external_update_url": "https://clients2.google.com/service/update2/crx"}' > /opt/google/chrome/extensions/${extensionID}.json
+
+    DOWNLOAD_FILE_NAME="crx?response=redirect&os=win&arch=x86-64&os_arch=x86-64&nacl_arch=x86-64&prod=chromecrx&prodchannel=unknown&prodversion=9999.0.9999.0&acceptformat=crx2,crx3&x=id=${extensionID}&uc"
+    DOWNLOAD_URL="https://clients2.google.com/service/update2/crx?response=redirect&os=win&arch=x86-64&os_arch=x86-64&nacl_arch=x86-64&prod=chromecrx&prodchannel=unknown&prodversion=9999.0.9999.0&acceptformat=crx2,crx3&x=id%3D${extensionID}%26uc"
+    wget -nc "${DOWNLOAD_URL}"
+
+    UNZIP_DIR="${TARGET_DIR}/${extensionName}"
+    if [[ -d "${UNZIP_DIR}" ]];
+    then
+      echo "${extensionName} extension directory exists. Skipping..."
+    else
+      echo "Unpacking ${extensionName} into directory: ${UNZIP_DIR}"
+
+      mkdir -vp "${UNZIP_DIR}"
+      pushd "${UNZIP_DIR}"
+
+      # unzip often failed with random errors, so instead of regular cp, let's try to fix it immediately
+      zip -FFv "$TARGET_DIR/${DOWNLOAD_FILE_NAME}" --out "${extensionName}.zip"
+      #cp -n "$TARGET_DIR/${DOWNLOAD_FILE_NAME}" "${extensionName}.zip"
+
+      unzip "./${extensionName}.zip"
+      popd
+    fi
+done
+
+popd