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#!/bin/sh

set -eu

echo "Install the Tor Browser"

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# Import the TBB_INSTALL, TBB_PROFILE and TBB_EXT variables, which
# contains the paths we will split TBB's actual browser (binaries
# etc), user data and extension into. While this differs from how the
# TBB organizes the files, the end result will be the same, and it's
# practical since when creating a new browser profile we can simply
# copy the profile directory without duplicating all extensions.
. /usr/local/lib/tails-shell-library/tor-browser.sh

download_and_verify_files() {
    local base_url bundles destination apt_proxy
    base_url="${1}"
    bundles="${2}"
    destination="${3}"

    # Use the builder's caching APT proxy, if any
    apt_proxy="$(apt-config --format '%v' dump Acquire::http::Proxy)"
    if [ -n "${apt_proxy}" ]; then
        export HTTP_PROXY="${apt_proxy}"
        export http_proxy="${apt_proxy}"
        export HTTPS_PROXY="${apt_proxy}"
        export https_proxy="${apt_proxy}"
    fi

    echo "${bundles}" | while read expected_sha256 tarball; do
        (
            cd "${destination}"
            echo "Fetching ${base_url}/${tarball} ..."
            curl --remote-name "${base_url}/${tarball}"
        )
        actual_sha256="$(sha256sum "${destination}/${tarball}" | cut -d' ' -f1)"
        if [ "${actual_sha256}" != "${expected_sha256}" ]; then
            echo "SHA256 mismatch for ${tarball}" >&2
            exit 1
        fi
    done
}

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install_tor_browser() {
    local bundle destination tmp prep
    bundle="${1}"
    destination="${2}"

    tmp="$(mktemp -d)"
    tar -xf "${bundle}" -C "${tmp}" tor-browser_en-US
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    prep="${tmp}"/tor-browser_en-US/Browser
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    # Enable our myspell/hunspell dictionaries. TBB only provides the
    # one for en-US, but Debian's seems more comprehensive, so we'll
    # only use Debian's dictionaries.
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    rm -f "${prep}"/dictionaries/*
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    for f in /usr/share/hunspell/*.aff /usr/share/hunspell/*.dic; do
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        ln -s "${f}" "${prep}"/dictionaries/
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    done

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    # We don't need the Tor binary (and shared libraries) and
    # documentation shipped in the TBB.
    rm -r "${prep}"/TorBrowser/Tor "${prep}"/TorBrowser/Docs

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    # We don't want tor-launcher to be part of the regular browser
    # profile. Moreover, for the stand-alone tor-launcher we use, we
    # need our patched version. So, the version shipped in the TB
    # really is not useful for us.
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    rm "${prep}/TorBrowser/Data/Browser/profile.default/extensions/tor-launcher@torproject.org.xpi"
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    # Remove TBB's torbutton since the "Tor test" will fail and about:tor
    # will report an error. We'll install our own Torbutton later, which
    # has the extensions.torbutton.test_enabled boolean pref as a workaround.
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    rm "${prep}/TorBrowser/Data/Browser/profile.default/extensions/torbutton@torproject.org.xpi"
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    # The Tor Browser will fail, complaining about an incomplete profile,
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    # unless there's a readable TorBrowser/Data/Browser/Caches
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    # in the directory where the firefox executable is located.
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    mkdir -p "${prep}"/TorBrowser/Data/Browser/Caches

    mv "${prep}" "${destination}"
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    rm -r "${tmp}"
}

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install_langpacks_from_bundles() {
    local bundles_dir destination
    bundles_dir="${1}"
    destination="${2}"

    for tarball in "${bundles_dir}"/tor-browser-*.tar.xz; do
        locale="$(echo "${tarball}" | sed "s@^.*/tor-browser-.*_\(.*\)\.tar\.xz@\1@")"
        if [ "${locale}" = en-US ]; then
            continue
        fi
        xpi="tor-browser_${locale}/Browser/TorBrowser/Data/Browser/profile.default/extensions/langpack-${locale}@firefox.mozilla.org.xpi"
        (
            cd "${bundles_dir}"
            tar -xf "${tarball}" "${xpi}"
            mv "${xpi}" "${destination}"
        )
    done
}

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get_firefox_version() {
    # The application.ini file
    local appini
    appini="${1}"
    sed -n 's/^Version=\(.*\)$/\1/p' "${appini}"
}

# Create and install a fake iceweasel package so we can install our
# desired Debian-packaged Iceweasel addons
install_fake_iceweasel_pkg() {
    local fake_version tmp
    fake_version="${1}"
    tmp="$(mktemp -d)"
    apt-get install --yes equivs
    cat > "${tmp}"/iceweasel.control << EOF
Section: web
Priority: optional
Homepage: https://tails.boum.org/
Standards-Version: 3.6.2

Package: iceweasel
Version: ${fake_version}
Maintainer: Tails developers <amnesia@boum.org>
Architecture: all
Description: (Fake) Iceweasel
 Make it possible to install Debian's Iceweasel addons without having to
 install a real Iceweasel.
EOF
    (
        cd "${tmp}"
        equivs-build "${tmp}"/iceweasel.control
        dpkg -i "${tmp}"/iceweasel_"${fake_version}"_all.deb
    )
    rm -R "${tmp}"
}

install_debian_extensions() {
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    local packages destination
    packages="${1}"
    destination="${2}"
    apt-get install --yes ${packages}
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    ln -s /usr/share/xul-ext/adblock-plus/ \
          "${destination}"/'{d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d}'
    ln -s /usr/share/xul-ext/torbutton/ \
          "${destination}"/torbutton@torproject.org
}

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create_default_profile() {
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    local tbb_profile extensions_dir destination
    tbb_profile="${1}"
    tbb_extensions_dir="${2}"
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    destination="${3}"

    rsync -a --exclude bookmarks.html --exclude extensions \
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          "${tbb_profile}"/ "${destination}"/
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    # Remove TBB's default bridges
    sed -i '/extensions\.torlauncher\.default_bridge\./d' "${destination}"/preferences/extension-overrides.js

    mkdir -p "${destination}"/extensions
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    for ext in "${tbb_extensions_dir}"/*; do
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        ln -s "${ext}" "${destination}"/extensions/
    done
}

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# Get the below with `grep "tor-browser-linux32-.*\.tar.xz" sha256sums.txt`
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BUNDLES="$(cat <<EOF
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473780a5145859a8d516e76cb27be25b0baf16007ba50cd8ba78a536bc806fc5  tor-browser-linux32-tbb-nightly_ar.tar.xz
3e3d6fd1ea47067fc00625b8cd62d23079ef71dc91734bfb823542c26ce192cf  tor-browser-linux32-tbb-nightly_en-US.tar.xz
df4745725e7b3fe99c218166ffbe38eef8e9d636c42b72c8a2b8229fc3bdd83b  tor-browser-linux32-tbb-nightly_ru.tar.xz
b624b1f9a16e4ff4cffb3478f63249ed73ae902732b64fca0f183ad73ed1b5ac  tor-browser-linux32-tbb-nightly_zh-CN.tar.xz
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EOF
)"

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# We'll use the en-US bundle as our basis; only langpacks will be
# installed from the other bundles.
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MAIN_BUNDLE="$(echo "${BUNDLES}" | grep -o "tor-browser-linux32-.*_en-US.tar.xz")"
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#VERSION="$(echo "${MAIN_BUNDLE}" | sed 's/tor-browser-linux32-\(.*\)_en-US.tar.xz/\1/')"
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VERSION=tbb-nightly-2014-10-07
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# Note that we cannot use https here since apt-cacher-ng (used by vagrant)
# gets confused and throws a 403. It doesn't matter, though, since we verify
# the checksums of each file downloaded.
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#TBB_DIST_URL="http://archive.torproject.org/tor-package-archive/torbrowser/${VERSION}"
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#TBB_DIST_URL="http://www.torproject.org/dist/torbrowser/${VERSION}/"
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#TBB_DIST_URL="http://people.torproject.org/~mikeperry/builds/${VERSION}/"
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#TBB_DIST_URL="http://people.torproject.org/~gk/testbuilds/${VERSION}"
TBB_DIST_URL="http://people.torproject.org/~linus/builds/${VERSION}"
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# The Debian Iceweasel extensions we want to install and make
# available in the Tor Browser.
DEBIAN_EXT="xul-ext-adblock-plus xul-ext-torbutton"

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TMP="$(mktemp -d)"
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download_and_verify_files "${TBB_DIST_URL}" "${BUNDLES}" "${TMP}"
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install_tor_browser "${TMP}/${MAIN_BUNDLE}" "${TBB_INSTALL}"
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mkdir -p "${TBB_EXT}"
install_langpacks_from_bundles "${TMP}" "${TBB_EXT}"
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rm -r "${TMP}"

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# Let's put all the extensions from TBB in the global extensions
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# directory...
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mv "${TBB_INSTALL}"/TorBrowser/Data/Browser/profile.default/extensions/* "${TBB_EXT}"
rmdir "${TBB_INSTALL}"/TorBrowser/Data/Browser/profile.default/extensions
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# ... and then install a few Iceweasel extension by using a fake
# Iceweasel equivs package to satisfy the dependencies.
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FIREFOX_VERSION=$(get_firefox_version "${TBB_INSTALL}"/application.ini)
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FAKE_ICEWEASEL_VERSION=${FIREFOX_VERSION}+fake1
install_fake_iceweasel_pkg "${FAKE_ICEWEASEL_VERSION}"
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install_debian_extensions "${DEBIAN_EXT}" "${TBB_EXT}"
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mkdir -p "${TBB_PROFILE}"
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create_default_profile "${TBB_INSTALL}"/TorBrowser/Data/Browser/profile.default "${TBB_EXT}" "${TBB_PROFILE}"
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chown -R root:root "${TBB_INSTALL}" "${TBB_PROFILE}" "${TBB_EXT}"
chmod -R a+rX "${TBB_INSTALL}" "${TBB_PROFILE}" "${TBB_EXT}"
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# Make the Tor Browser into the system's default web browser
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update-alternatives --install /usr/bin/x-www-browser x-www-browser /usr/local/bin/tor-browser 99
update-alternatives --install /usr/bin/gnome-www-browser gnome-www-browser /usr/local/bin/tor-browser 99