Restore the browser, gaming, development, and Windows VM menus
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Executable
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#!/bin/bash
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# blob:summary=Create a desktop launcher for a web app
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# blob:args=[name url icon-url-or-name [custom-exec] [mime-types]]
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set -e
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ICON_DIR="$HOME/.local/share/icons/hicolor/256x256/apps"
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safe_icon_name() {
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printf '%s\n' "$1" \
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| tr '[:upper:]' '[:lower:]' \
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| sed 's/[^[:alnum:]]\+/-/g; s/^-//; s/-$//'
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}
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require_plain_name() {
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# The name becomes a filename. A slash would turn it into directory levels, so
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# the launcher lands somewhere blob-webapp-remove cannot address and the app
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# is stuck in the launcher; a leading ../ leaves the applications directory
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# altogether. Refuse rather than silently renaming what the user typed -- most
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# often it is a URL entered in the name field.
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if [[ $1 == */* ]]; then
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echo "App name cannot contain '/': $1"
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exit 1
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fi
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}
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icon_name_from_ref() {
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local ref="$1"
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local name
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name=$(basename "$ref")
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if [[ $name == *.* ]]; then
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safe_icon_name "${name%.*}"
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else
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printf '%s\n' "$name"
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fi
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}
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install_user_icon() {
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local source="$1"
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local name="$2"
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local ext="${source##*.}"
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[[ $ext == "$source" ]] && ext="png"
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mkdir -p "$ICON_DIR"
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cp "$source" "$ICON_DIR/$name.$ext"
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gtk-update-icon-cache "$HOME/.local/share/icons/hicolor" &>/dev/null || true
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printf '%s\n' "$name"
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}
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download_icon() {
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curl -fsSL --max-time 10 -o "$2" "$1" 2>/dev/null &&
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[[ -s $2 && $(file -b --mime-type "$2") == image/* ]]
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}
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# Chromium --app= treats javascript:, file:, and data: as a document to
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# run. Prefix schemeless input with https as before, then refuse anything
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# that is not http(s).
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normalize_webapp_url() {
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local url=$1
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if [[ ! $url =~ ^[a-zA-Z][a-zA-Z0-9+.-]*: ]]; then
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url="https://$url"
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fi
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printf '%s' "$url"
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}
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# Raw whitespace must be percent-encoded in a URL. Refuse it before serializing
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# the desktop entry; before Exec argument quoting, it also split browser flags
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# and additional URLs into separate arguments. Schemes are case-insensitive.
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require_http_url() {
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local url=$1
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if [[ $url =~ [[:space:]] ]]; then
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echo "Error: web app URL must not contain whitespace." >&2
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exit 1
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fi
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if [[ ! ${url,,} =~ ^https?:// ]]; then
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echo "Error: web app URL must be http or https." >&2
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exit 1
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fi
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}
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fetch_site_icon() {
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local site_url="$1" dest="$2"
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local origin page icon_url
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origin=$(sed -E 's|^(https?://[^/]+).*|\1|' <<<"$site_url")
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# Prefer the site's own high-res icon (apple-touch-icon is typically 180px+),
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# then the well-known path, then Google's favicon service as a last resort.
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page=$(curl -fsSL --max-time 5 "$site_url" 2>/dev/null | head -c 100000 | tr '\n' ' ')
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icon_url=$(grep -oiE "<link[^>]*rel=[\"'][^\"']*apple-touch-icon[^\"']*[\"'][^>]*>" <<<"$page" |
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grep -oiE "href=[\"'][^\"']+" | head -1 | sed -E "s/^href=[\"']//")
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case $icon_url in
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http://* | https://*) ;;
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//*) icon_url="https:$icon_url" ;;
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/*) icon_url="$origin$icon_url" ;;
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?*) icon_url="$origin/$icon_url" ;;
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esac
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{ [[ -n $icon_url ]] && download_icon "$icon_url" "$dest"; } ||
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download_icon "$origin/apple-touch-icon.png" "$dest" ||
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download_icon "https://www.google.com/s2/favicons?domain=${site_url}&sz=256" "$dest"
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}
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desktop_string_escape() {
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# Desktop Entry "string" value (freedesktop Desktop Entry Spec, "Value types"):
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# a raw newline would start a new key line and let a value inject a second
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# Exec=. Escape backslash first, then tab/CR/LF and a leading space. Every value
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# written into the .desktop file passes through here.
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#
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# Parameter expansion rather than sed: GNU sed's N auto-prints the pattern space
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# and exits at end of input, so a `:a;N;$!ba` slurp skips every following s///
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# for a value with no newline in it - which is every value except the injection
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# attempt this exists to stop.
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local value="$1"
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value=${value//\\/\\\\}
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value=${value//$'\t'/\\t}
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value=${value//$'\r'/\\r}
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value=${value//$'\n'/\\n}
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[[ $value == " "* ]] && value="\\s${value# }"
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printf '%s' "$value"
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}
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desktop_exec_arg() {
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# One Exec argument, double-quoted per the freedesktop Exec spec: inside quotes
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# " ` $ \ take a backslash and a literal % becomes %%. Only the default Exec's
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# URL needs this; $CUSTOM_EXEC stays a whole command line (file-syntax only).
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local escaped
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escaped=$(printf '%s' "$1" \
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| sed -e 's/\\/\\\\/g' -e 's/"/\\"/g' -e 's/`/\\`/g' -e 's/\$/\\$/g' -e 's/%/%%/g')
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printf '"%s"' "$escaped"
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}
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if (( $# < 3 )); then
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echo -e "\e[32mLet's create a new web app you can start with the app launcher.\n\e[0m"
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APP_NAME=$(gum input --prompt "Name> " --placeholder "My favorite web app")
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require_plain_name "$APP_NAME"
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APP_URL=$(gum input --prompt "URL> " --placeholder "https://example.com")
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APP_URL=$(normalize_webapp_url "$APP_URL")
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require_http_url "$APP_URL"
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# Try to fetch the site's icon automatically first.
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mkdir -p "$ICON_DIR"
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ICON_VALUE=$(safe_icon_name "$APP_NAME")
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if fetch_site_icon "$APP_URL" "$ICON_DIR/$ICON_VALUE.png"; then
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gtk-update-icon-cache "$HOME/.local/share/icons/hicolor" &>/dev/null || true
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ICON_REF="$ICON_VALUE"
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else
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ICON_REF=$(gum input --prompt "Icon URL/name> " --placeholder "Could not fetch favicon automatically. Enter PNG icon URL or icon name")
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fi
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CUSTOM_EXEC=""
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MIME_TYPES=""
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INTERACTIVE_MODE=true
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else
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APP_NAME="$1"
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APP_URL=$(normalize_webapp_url "$2")
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require_http_url "$APP_URL"
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ICON_REF="$3"
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CUSTOM_EXEC="$4" # Optional custom exec command
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MIME_TYPES="$5" # Optional mime types
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INTERACTIVE_MODE=false
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fi
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# Ensure valid execution
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if [[ -z $APP_NAME || -z $APP_URL ]]; then
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echo "You must set app name and app URL!"
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exit 1
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fi
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require_plain_name "$APP_NAME"
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if [[ -z $ICON_REF ]]; then
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ICON_VALUE=$(safe_icon_name "$APP_NAME")
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mkdir -p "$ICON_DIR"
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if ! fetch_site_icon "$APP_URL" "$ICON_DIR/$ICON_VALUE.png"; then
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echo "Error: Failed to download icon."
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exit 1
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fi
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gtk-update-icon-cache "$HOME/.local/share/icons/hicolor" &>/dev/null || true
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elif [[ $ICON_REF =~ ^https?:// ]]; then
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ICON_VALUE=$(safe_icon_name "$APP_NAME")
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mkdir -p "$ICON_DIR"
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if ! download_icon "$ICON_REF" "$ICON_DIR/$ICON_VALUE.png"; then
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echo "Error: Failed to download icon."
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exit 1
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fi
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gtk-update-icon-cache "$HOME/.local/share/icons/hicolor" &>/dev/null || true
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elif [[ -f $ICON_REF ]]; then
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ICON_VALUE=$(install_user_icon "$ICON_REF" "$(safe_icon_name "$APP_NAME")")
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else
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# Bundled Blob icons are package-owned under /usr/share/icons/hicolor.
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# Accept either "HEY" or the historical "HEY.png" argument form.
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ICON_VALUE=$(icon_name_from_ref "$ICON_REF")
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fi
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# Default Exec quotes the URL as one Exec-spec argument; the whole line then gets
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# the file-syntax escaping below (unescaped first at read time per spec, so the
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# layers compose). $CUSTOM_EXEC is a full command line, so it gets file-syntax only.
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if [[ -n $CUSTOM_EXEC ]]; then
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EXEC_COMMAND=$CUSTOM_EXEC
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else
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EXEC_COMMAND="blob-launch-webapp $(desktop_exec_arg "$APP_URL")"
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fi
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# Create application .desktop file
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DESKTOP_DIR="$HOME/.local/share/applications"
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DESKTOP_FILE="$DESKTOP_DIR/$APP_NAME.desktop"
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mkdir -p "$DESKTOP_DIR"
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name_field=$(desktop_string_escape "$APP_NAME")
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exec_field=$(desktop_string_escape "$EXEC_COMMAND")
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icon_field=$(desktop_string_escape "$ICON_VALUE")
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cat >"$DESKTOP_FILE" <<EOF
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[Desktop Entry]
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Version=1.0
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Name=$name_field
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Comment=$name_field
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Exec=$exec_field
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Terminal=false
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Type=Application
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Icon=$icon_field
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StartupNotify=true
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EOF
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# Add mime types if provided
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if [[ -n $MIME_TYPES ]]; then
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printf 'MimeType=%s\n' "$(desktop_string_escape "$MIME_TYPES")" >>"$DESKTOP_FILE"
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fi
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chmod +x "$DESKTOP_FILE"
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if [[ $INTERACTIVE_MODE == "true" ]]; then
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echo -e "You can now find $APP_NAME using the app launcher (SUPER + SPACE)\n"
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fi
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