Haketilo

#!/bin/sh

# Copyright (C) 2021 Wojtek Kosior

# Redistribution terms are gathered in the `copyright' file.

. ./shell_utils.sh

handle_export_line() {

    if [ "x$1" = "xEXPORTS_START" ]; then

	if [ "$STATE" = "before_block" ]; then

	    STATE="in_block"

	fi

    elif [ "x$1" = "xEXPORT" ]; then

	if [ "$STATE" != "in_block" ]; then

	    return

	fi

	EXPORTCODE="${EXPORTCODE}window.killtheweb.$2 = $2;$ENDL"

	PREVIOUS_FILE="$(map_get EXPORTS $2)"

	if [ "x$PREVIOUS_FILE" != "x" ]; then

	    errcho "export $2 present in both $PREVIOUS_FILE and $FILE"

	    return 1

	fi

	map_set_instr EXPORTS $2 "$FILE"

    elif [ "x$1" = "xEXPORTS_END" ]; then

	if [ "$STATE" = "in_block" ]; then

	    STATE="after_block"

	fi

    fi

}

translate_exports() {

    STATE="before_block"

    EXPORTCODE=''

    while read EXPORT_LINE; do

	handle_export_line $EXPORT_LINE || return 1

    done

    map_set_instr EXPORTCODES $FILEKEY "$EXPORTCODE"

}

add_exports() {

    FILE="$1"

    FILEKEY="$(sanitize "$FILE")"

    eval "$(grep -o 'EXPORT.\+' "$1" | translate_exports || exit 1)"

}

handle_import_line() {

    if [ "x$1" = "xIMPORTS_START" ]; then

	if [ "$STATE" = "before_block" ]; then

	    STATE="in_block"

	fi

    elif [ "x$1" = "xIMPORT" ]; then

	if [ "$STATE" != "in_block" ]; then

	    return

	fi

	IMPORTCODE="${IMPORTCODE}const $2 = window.killtheweb.$2;$ENDL"

	IMPORTS="$IMPORTS $2"

    elif [ "x$1" = "xIMPORTS_END" ]; then

	if [ "$STATE" = "in_block" ]; then

	    STATE="after_block"

	fi

    fi

}

translate_imports() {

    STATE="before_block"

    IMPORTCODE=''

    IMPORTS=''

    while read IMPORT_LINE; do

	handle_import_line $IMPORT_LINE || return 1

    done

    map_set_instr IMPORTCODES $FILEKEY "$IMPORTCODE"

    map_set_instr IMPORTS $FILEKEY "$IMPORTS"

}

add_imports() {

    FILE="$1"

    FILEKEY="$(sanitize "$FILE")"

    eval "$(grep -o 'IMPORT.\+' "$1" | translate_imports || exit 1)"

}

compute_scripts_list_rec() {

    local FILE="$1"

    local FILEKEY=$(sanitize "$1")

    local FILESTATE="$(map_get FILESTATES $FILEKEY)"

    if [ "xprocessed" = "x$FILESTATE" ]; then

	return

    fi

    if [ "xprocessing" = "x$FILESTATE" ]; then

	errcho "import loop on $FILE"

	return 1

    fi

    USED="$USED $FILEKEY"

    map_set FILESTATES $FILEKEY "processing"

    local IMPORT

    for IMPORT in $(map_get IMPORTS $FILEKEY); do

	NEXT_FILE="$(map_get EXPORTS $IMPORT)"

	if [ "x" = "x$NEXT_FILE" ]; then

	    errcho "nothing exports $IMPORT, required by $FILE"

	    return 1

	fi

	if ! compute_scripts_list_rec "$NEXT_FILE"; then

	    errcho "when satisfying $IMPORT for $FILE"

	    return 1

	fi

    done

    [ "x$FILE" = "xexports_init.js" ] || echo $FILE # exports_init.js is hardcoded to load first; the entire export system depends on it

    map_set FILESTATES $FILEKEY "processed"

}

compute_scripts_list() {

    USED=''

    echo COMPUTED_SCRIPTS=\"exports_init.js

    compute_scripts_list_rec "$1"

    echo \"

    for FILEKEY in $USED; do

	map_set_instr USED $FILEKEY yes

    done

}

as_json_list() {

    while true; do

	if [ "x" = "x$2" ]; then

	    echo -n '\\n'"\t\t\"$1\""'\\n\t'

	    return

	fi

	echo -n '\\n'"\t\t\"$1\","

	shift

    done

}

as_html_list() {

    while [ "x" != "x$1" ]; do

	echo -n '\\n'"    <script src=\"/$1\"></script>"

	shift

    done

}

set_browser() {

    if [ "x$1" = "xmozilla" -o "x$1" = "xchromium" ]; then

	BROWSER="$1"

    else

	errcho "usage:  $0 mozilla|chromium"

	exit 1

    fi

}

main() {

    set_browser "$1"

    # placate importers of these, as they are exported by the yet-to-be-created exports_init.js

    EXPORTS__browser=exports_init.js

    EXPORTS__is_chrome=exports_init.js

    EXPORTS__is_mozilla=exports_init.js

    SCRIPTDIRS='background html common content'

    SCRIPTS=$(find $SCRIPTDIRS -name '[^.#]*.js')

    for SCRIPT in $SCRIPTS; do

	add_exports $SCRIPT

	add_imports $SCRIPT

    done

    eval "$(compute_scripts_list background/main.js || exit 1)"

    BGSCRIPTS="$(as_json_list $COMPUTED_SCRIPTS)"

    eval "$(compute_scripts_list content/main.js || exit 1)"

    CONTENTSCRIPTS="$(as_json_list $COMPUTED_SCRIPTS)"

    eval "$(compute_scripts_list html/display-panel.js || exit 1)"

    POPUPSCRIPTS="$(as_html_list $COMPUTED_SCRIPTS)"

    eval "$(compute_scripts_list html/options_main.js || exit 1)"

    OPTIONSSCRIPTS="$(as_html_list $COMPUTED_SCRIPTS)"

    BUILDDIR=build_$BROWSER

    rm -rf $BUILDDIR

    mkdir $BUILDDIR

    for DIR in $(find $SCRIPTDIRS -type d); do

	mkdir -p $BUILDDIR/$DIR

    done

    CHROMIUM_KEY=''

    GECKO_APPLICATIONS=''

    if [ "$BROWSER" = "chromium" ]; then

	CHROMIUM_KEY="$(dd if=/dev/urandom bs=32 count=1 2>/dev/null | base64)"

	echo "chromium key is" $CHROMIUM_KEY

	CHROMIUM_KEY="chromium-key-dummy-file-$CHROMIUM_KEY"

	CHROMIUM_KEY=$(echo $CHROMIUM_KEY | tr / -);

	touch $BUILDDIR/$CHROMIUM_KEY

	CHROMIUM_KEY="\n\

	// WARNING!!!\n\

	// EACH USER SHOULD REPLACE DUMMY FILE's VALUE WITH A UNIQUE ONE!!!\n\

	// OTHERWISE, SECURITY CAN BE TRIVIALLY COMPROMISED!\n\

	// Only relevant to users of chrome-based browsers.\n\

	// Users of Firefox forks are safe.\n\

	\"$CHROMIUM_KEY\"\

"

    else

	GECKO_APPLICATIONS="\n\

    \"applications\": {\n\

	\"gecko\": {\n\

	    \"id\": \"{6fe13369-88e9-440f-b837-5012fb3bedec}\",\n\

	    \"strict_min_version\": \"60.0\"\n\

	}\n\

    },"

    fi

    sed "\

s^_GECKO_APPLICATIONS_^$GECKO_APPLICATIONS^

s^_CHROMIUM_KEY_^$CHROMIUM_KEY^

s^_BGSCRIPTS_^$BGSCRIPTS^

s^_CONTENTSCRIPTS_^$CONTENTSCRIPTS^" \

	< manifest.json > $BUILDDIR/manifest.json

    ./process_html_file.sh html/display-panel.html |

	sed "s^_POPUPSCRIPTS_^$POPUPSCRIPTS^" \

	    > $BUILDDIR/html/display-panel.html

    ./process_html_file.sh html/options.html |

	sed "s^_OPTIONSSCRIPTS_^$OPTIONSSCRIPTS^" \

	    > $BUILDDIR/html/options.html

    for FILE in $SCRIPTS; do

	FILEKEY=$(sanitize "$FILE")

	if [ "xyes" != "x$(map_get USED $FILEKEY)" ]; then

	    errcho "WARNING! $FILE not used"

	else

	    (echo "\

\"use strict\";

({fun: (function() {

$(map_get IMPORTCODES $FILEKEY)

";

# A hack to insert the contents of default_settings.json at the appropriate location in background/main.js

if [ "$FILE" = "background/main.js" ]; then

    # Uses an internal sed expression to escape and indent the JSON file for use in the external sed expression

    sed 's/^        `DEFAULT SETTINGS`$/'"$(sed -E 's/([\\\&\/])/\\\1/g; s/^/        /; s/$/\\/' < default_settings.json) "/g < "$FILE"

else

    cat $FILE

fi

echo "

$(map_get EXPORTCODES $FILEKEY)

})}).fun();") > $BUILDDIR/$FILE

	fi

    done

    if [ "$BROWSER" = "chromium" ]; then

	cat > $BUILDDIR/exports_init.js <<EOF

window.killtheweb={is_chrome: true, browser: window.chrome};

EOF

    else

	cat > $BUILDDIR/exports_init.js <<EOF

/* Polyfill for IceCat 60. */

String.prototype.matchAll = String.prototype.matchAll || function(regex) {

    if (regex.flags.search("g") === -1)

        throw new TypeError("String.prototype.matchAll called with a non-global RegExp argument");

    for (const matches = [];;) {

        if (matches[matches.push(regex.exec(this)) - 1] === null)

	    return matches.splice(0, matches.length - 1);

    }

}

window.killtheweb={is_mozilla: true, browser: this.browser};

EOF

    fi

    cp -r copyright licenses/ $BUILDDIR

    cp html/*.css $BUILDDIR/html

    mkdir $BUILDDIR/icons

    cp icons/*.png $BUILDDIR/icons

    if [ "$BROWSER" = "chromium" ]; then

	for MOZILLA_FILE in $(find $BUILDDIR -name "MOZILLA_*"); do

	    echo > "$MOZILLA_FILE"

	done

    fi

    if [ "$BROWSER" = "mozilla" ]; then

	for CHROMIUM_FILE in $(find $BUILDDIR -name "CHROMIUM_*"); do

	    echo > "$CHROMIUM_FILE"

	done

    fi

}

main "$@"