#!/usr/bin/env python
#
# Copyright (C) 2018 Igalia S.L.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice, this
#    list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright notice,
#    this list of conditions and the following disclaimer in the documentation
#    and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
# ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

import base64
import datetime
import hashlib
import json
import optparse
import os
import shutil
import subprocess
import sys
import tempfile
import zipfile

top_level_directory = os.path.normpath(os.path.join(os.path.dirname(__file__), '..', '..'))
sys.path.insert(0, os.path.join(top_level_directory, 'Tools', 'flatpak'))
sys.path.insert(0, os.path.join(top_level_directory, 'Tools', 'jhbuild'))
import jhbuildutils
import flatpakutils


# Ideally we should use something like lddtree or create our own version of that
# But in practice for jsc bundles there isn't recursive library entries, so we
# use standard ldd here just to avoid having to require lddtree.
def ldd_get_libs_and_interpreter(binary):
    lddCommand = ['ldd', binary]
    lddProcess = subprocess.Popen(lddCommand, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
    stdout, stderr = lddProcess.communicate()
    if lddProcess.returncode != 0:
        raise RuntimeError('The ldd command returned non-zero status')
    libs = []
    for line in stdout.splitlines():
        line = line.strip()
        if '=>' in line:
            line = line.split('=>')[1].strip()
            if 'not found' in line:
                raise RuntimeError('Some dependencies can not be found with ldd.')
            line = line.split(' ')[0].strip()
            if os.path.isfile(line):
                libs.append(line)
        else:
            line = line.split(' ')[0].strip()
            if os.path.isfile(line):
                interpreter = line
    return libs, interpreter


def generate_readme(bundleTmpDir, builderName, configuration, platform, revision):
    print('Generate README.txt file')
    readmeFile = os.path.join(bundleTmpDir, 'README.txt')
    with open(readmeFile, 'w') as readmeHandle:
        readmeHandle.write('JSC bundle details\n')
        readmeHandle.write(' Builder name: %s\n' % builderName)
        readmeHandle.write(' Builder date: %s\n' % datetime.datetime.now().isoformat())
        readmeHandle.write(' Configuration: %s\n' % configuration)
        readmeHandle.write(' WebKit Platform: %s\n' % platform)
        readmeHandle.write(' WebKit Revision: %s\n' % revision)
        readmeHandle.write('\nInstructions: Execute the run-jsc wrapper script.\n')
    return True


def generate_wrapper_script(bundleTmpDir, interpreter):
    print('Generate wrapper script run-jsc')
    scriptFile = os.path.join(bundleTmpDir, 'run-jsc')
    with open(scriptFile, 'w') as scriptHandle:
        scriptHandle.write('#!/bin/sh\n')
        scriptHandle.write('MYDIR="$(dirname $(readlink -f $0))"\n')
        scriptHandle.write('export LD_LIBRARY_PATH="${MYDIR}/lib"\n')
        scriptHandle.write('exec "${MYDIR}/lib/%s" "${MYDIR}/bin/jsc" "$@"\n' % os.path.basename(interpreter))
    os.chmod(scriptFile, 0755)


def copy_and_remove_rpath(origFile, destinationDir, type='bin'):
    if not os.path.isfile(origFile):
        raise ValueError('Can not find file %s' % origFile)
    print('Copy to bundle [%s]: %s' % (type, origFile))
    shutil.copy(origFile, destinationDir)
    try:
        patchElfCommand = ['patchelf', '--remove-rpath', os.path.join(destinationDir, os.path.basename(origFile))]
        if subprocess.call(patchElfCommand) != 0:
            print('WARNING: The patchelf command returned non-zero status')
    except OSError as e:
        if e.errno == os.errno.ENOENT:
            print('WARNING: patchelf not found. Not modifying rpath')
        else:
            raise


def createJSCBundle(configuration, revision=None, builderName=None, platform=None):
    buildDir = os.path.abspath(os.path.join(os.path.dirname(__file__), '..', '..', 'WebKitBuild'))
    binDir = os.path.join(buildDir, configuration.capitalize(), 'bin')
    libDir = os.path.join(buildDir, configuration.capitalize(), 'lib')
    jscBinary = os.path.join(binDir, 'jsc')
    if not os.path.isfile(jscBinary) or not os.access(jscBinary, os.X_OK):
        raise ValueError('Cannot find jsc at %s' % jscBinary)

    # Define names and paths for the generation of the bundle.
    bundleTmpDir = os.path.join(buildDir, 'jsc_tmp')
    bundleTmpLibDir = os.path.join(bundleTmpDir, 'lib')
    bundleTmpBinDir = os.path.join(bundleTmpDir, 'bin')
    bundleFileName = 'jsc_' + configuration
    bundleFileCompressed = os.path.join(buildDir, bundleFileName + '.zip')

    # Clean everything from previous runs
    if os.path.isdir(bundleTmpDir):
        shutil.rmtree(bundleTmpDir)
    if os.path.isfile(bundleFileCompressed):
        os.remove(bundleFileCompressed)

    # Create bundleTmpDir and put there everything needed.
    os.makedirs(bundleTmpDir)
    os.makedirs(bundleTmpLibDir)
    os.makedirs(bundleTmpBinDir)
    copy_and_remove_rpath(jscBinary, bundleTmpBinDir, type='bin')
    libraries, interpreter = ldd_get_libs_and_interpreter(jscBinary)
    copy_and_remove_rpath(interpreter, bundleTmpLibDir, type='interpreter')
    for library in libraries:
        copy_and_remove_rpath(library, bundleTmpLibDir, type='lib')
    generate_readme(bundleTmpDir, builderName, configuration, platform, revision)
    generate_wrapper_script(bundleTmpDir, interpreter)

    # jsvu project prefers .zip rather than .tar.xz
    with zipfile.ZipFile(bundleFileCompressed, 'w', compression=zipfile.ZIP_DEFLATED) as zipHandle:
        for dirname, subdirs, files in os.walk(bundleTmpDir):
            for filename in files:
                systemFilePath = os.path.join(dirname, filename)
                zipFilePath = systemFilePath.replace(bundleTmpDir, '', 1).lstrip('/')
                zipHandle.write(systemFilePath, zipFilePath)

    if not os.path.isfile(bundleFileCompressed):
        raise RuntimeError('Unable to create the file %s' % bundleFileCompressed)
    return bundleFileCompressed


def sha256sum(bundleFilePath):
    hash = hashlib.sha256()
    with open(bundleFilePath, 'rb') as f:
        for chunk in iter(lambda: f.read(4096), b''):
            hash.update(chunk)
    return hash.hexdigest()


# The expected format for --remote-config-file is something like:
# {
# "servername": "webkitgtk.org",
# "serveraddress": "webkitgtk.intranet-address.local",
# "serverport": "23",
# "username": "upload-bot-64",
# "baseurl": "https://webkitgtk.org/jsc-built-products/x86_64",
# "sshkey": "output of the priv key in base64. E.g. cat ~/.ssh/id_rsa|base64 -w0"
# }
def uploadJSCBundle(bundleFilePath, remoteConfigFile, configuration, revision):
    remoteData = json.load(open(remoteConfigFile))
    remoteFileName = str(revision) + '.zip'
    remoteFileBundlePathName = os.path.join(configuration, remoteFileName)
    remoteFileHashPathName = os.path.join(configuration, str(revision) + '.sha256sum')
    with tempfile.NamedTemporaryFile() as sshkeyfile:
        # In theory NamedTemporaryFile() is already created 0600. But it don't hurts ensuring this again here.
        os.chmod(sshkeyfile.name, 0600)
        sshkeyfile.write(base64.b64decode(remoteData['sshkey']))
        sshkeyfile.flush()
        # Generate and upload also a sha256 hash
        with tempfile.NamedTemporaryFile() as hashcheckfile:
            hashforbundle = sha256sum(bundleFilePath)
            os.chmod(hashcheckfile.name, 0644)
            hashcheckfile.write('%s %s\n' % (hashforbundle, remoteFileName))
            hashcheckfile.flush()
            with tempfile.NamedTemporaryFile() as uploadinstructionsfile:
                uploadinstructionsfile.write('progress\n')
                uploadinstructionsfile.write('put %s %s\n' % (bundleFilePath, remoteFileBundlePathName))
                uploadinstructionsfile.write('put %s %s\n' % (hashcheckfile.name, remoteFileHashPathName))
                uploadinstructionsfile.write('quit\n')
                uploadinstructionsfile.flush()
                # The idea of this is to ensure scp doesn't ask any question (not even on the first run).
                # This should be secure enough according to https://www.gremwell.com/ssh-mitm-public-key-authentication
                sftpCommand = ['sftp',
                               '-o', 'StrictHostKeyChecking=no',
                               '-o', 'UserKnownHostsFile=/dev/null',
                               '-o', 'LogLevel=ERROR',
                               '-P', remoteData['serverport'],
                               '-i', sshkeyfile.name,
                               '-b', uploadinstructionsfile.name,
                               '%s@%s' % (remoteData['username'], remoteData['serveraddress'])]
                print('Uploading bundle to %s as %s with sha256 hash %s' % (remoteData['servername'], remoteFileBundlePathName, hashforbundle))
                if subprocess.call(sftpCommand) != 0:
                    raise RuntimeError('The sftp command returned non-zero status')

    print('Done: archive sucesfully uploaded to %s/%s' % (remoteData['baseurl'], remoteFileBundlePathName))
    return 0


def main():
    parser = optparse.OptionParser('usage: %prog [options]')
    parser.add_option('--platform', dest='platform')
    parser.add_option('--debug', action='store_const', const='debug', dest='configuration')
    parser.add_option('--release', action='store_const', const='release', dest='configuration')
    parser.add_option('--revision', action='store', type='string', dest='revision')
    parser.add_option('--builder-name', action='store', type='string', dest='buildername')
    parser.add_option('--remote-config-file', action='store',  type='string', dest='remoteConfigFile')
    options, args = parser.parse_args()

    if not options.platform:
        parser.error('Platform is required')
        return 1
    if not options.configuration:
        parser.error('Configuration is required')
        return 1

    platform = options.platform.lower()
    configuration = options.configuration.lower()
    if platform == 'gtk':
        flatpakutils.run_in_sandbox_if_available(sys.argv)
        if not flatpakutils.is_sandboxed():
            jhbuildutils.enter_jhbuild_environment_if_available("gtk")
    else:
        raise NotImplementedError('Unsupported platform')

    bundleFilePath = createJSCBundle(configuration, options.revision, options.buildername, platform)
    print('Bundle file created at: %s' % bundleFilePath)
    if options.remoteConfigFile is not None and os.path.isfile(options.remoteConfigFile):
        return uploadJSCBundle(bundleFilePath, options.remoteConfigFile, options.configuration, options.revision)
    return 0


if __name__ == '__main__':
    sys.exit(main())