#!/bin/bash
#
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements.  See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License.  You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#

# This script will download the release candidate artifacts and verify
# they are properly signed and authentic. The script assumes you have
# curl, git, python and gpg already installed and that your gpg is trusted.

# the location providing the rc distribution
RC_DIST=https://dist.apache.org/repos/dist/dev/openwhisk

# the location providing the KEYS
KEYS_DIST=https://dist.apache.org/repos/dist/release/openwhisk

# the artifact being released
NAME=${1?"missing artifact name e.g., openwhisk-client-js"}

# the name of the project (to match what is in the NOTICE file)
DESCRIPTION=${2?"missing project description e.g., 'OpenWhisk JavaScript Client Library'"}

# the version of the release artifact
V=${3?"missing version e.g., '3.19.0'"}

# the release candidate, usualy 'rc1'
RC=${4:-rc1}

# set to non-zero to download the artifacts to verify, this is the default
DL=${DL:-1}

# set to local dir containing artifacts; only used if DL is 0
# LOCAL_DIR=${LOCAL_DIR:-.}

# set to non-zero to import the release keys, this is the default
IMPORT=${IMPORT:-1}

# this is the construct name of the artifact
BASE=$NAME-$V
TGZ=$NAME-$V-sources.tar.gz

# this is a constructed name for the keys file
KEYS=$RC-$V-KEYS

NOTICE=$(cat << END
Apache $DESCRIPTION
Copyright 2016-2019 The Apache Software Foundation

This product includes software developed at
The Apache Software Foundation (http://www.apache.org/).
END
)

echo "$(basename $0) (script SHA1: $(gpg --print-md SHA1 $0 | cut -d' ' -f2-))"

DIR=$(mktemp -d)

echo working in the following directory:
echo "$(tput setaf 6)$DIR$(tput sgr0)"

if [ $DL -ne 0 ]; then
  SRC=$RC_DIST/$RC
  echo fetching tarball and signatures from $SRC

  echo fetching $TGZ
  curl $SRC/$TGZ -s -o "$DIR/$TGZ"

  echo fetching $TGZ.asc
  curl $SRC/$TGZ.asc -s -o "$DIR/$TGZ.asc"

  echo fetching $TGZ.sha512
  curl $SRC/$TGZ.sha512 -s -o "$DIR/$TGZ.sha512"
else
  echo copying from $LOCAL_DIR
  cp "$LOCAL_DIR/$TGZ" "$DIR/$TGZ" || exit 1
  cp "$LOCAL_DIR/$TGZ.asc" "$DIR/$TGZ.asc" || exit 1
  cp "$LOCAL_DIR/$TGZ.sha512" "$DIR/$TGZ.sha512" || exit 1
fi

if [ $IMPORT -ne 0 ]; then
  echo fetching release keys
  curl $KEYS_DIST/KEYS -s -o "$DIR/$KEYS"

  echo importing keys
  gpg --import "$DIR/$KEYS"
fi

function validate() {
  if [[ $1 == $2 ]]; then
    printf " $(tput setaf 2)passed$(tput sgr0)"
    if [[ $4 != "" ]]; then
      echo " ($4)"
    else
      printf "\n"
    fi
  else
    printf " $(tput setaf 1)failed$(tput sgr0)"
    if [[ $3 != "" ]]; then
      echo " ($3)"
    else
      printf "\n"
    fi
  fi
}

echo "unpacking tar ball"
tar zxf "$DIR/$TGZ" -C "$DIR"

echo "cloning scancode"
cd "$DIR" && git clone https://github.com/apache/openwhisk-utilities.git --depth 1

echo "computing sha512 for $TGZ"
EXPECTED=$(cat "$DIR/$TGZ.sha512")
CMD="cd $DIR && gpg --print-md SHA512 '$TGZ'"
SHA=$(eval $CMD)
echo "SHA512: $(tput setaf 6)$SHA$(tput sgr0)"
printf "validating sha512..."
validate "$EXPECTED" "$SHA" "$CMD"

printf "verifying asc..."  
CMD="gpg --verify '$DIR/$TGZ.asc' '$DIR/$TGZ'"
ASC=$(eval $CMD 2>&1)
RES=$?
if [[ $ASC =~ ^.*\"(.*)\".*$ ]]; then
  SIGNER=${BASH_REMATCH[1]}
else
  SIGNER="$(tput setaf 1)???$(tput sgr0)"
fi
validate $RES 0 "$CMD" "signed-by: $SIGNER"

printf "verifing notice..."
NTXT=$(cat "$DIR/$BASE/NOTICE.txt")
validate "$NOTICE" "$NTXT" "cat '$DIR/$BASE/NOTICE.txt'"

printf "verifying absence of DISCLAIMER.txt"
CMD="test -f '$DIR/$BASE/DISCLAIMER.txt'"
TEST_DIS=$(eval "$CMD")
validate $? 1 "$CMD"

# If a project bundles any dependencies, there will be additional
# text appended to LICENSE.txt to summarize the additional licenses.
# Therefore only enforce a prefix match between the project's
# LICENSE.txt and the official text of the Apache LICENSE-2.0.
printf "verifying license..."
curl http://www.apache.org/licenses/LICENSE-2.0 -s -o "$DIR/LICENSE-2.0"
LICENSE_LEN=$(wc -c "$DIR/LICENSE-2.0" | awk '{print $1}')
CMD="cmp -n $LICENSE_LEN '$DIR/LICENSE-2.0' '$DIR/$BASE/LICENSE.txt'"
CMP=$(eval "$CMD")
validate $? 0 "$CMD"

printf "verifying sources have proper headers..."
if [ -f '$DIR/$BASE/tools/travis/scancodeExlusions' ]; then
    SCANCODE_EXTRA_ARGS="--gitignore '$DIR/$BASE/tools/travis/scancodeExclusions'"
else
    SCANCODE_EXTRA_ARGS=""
fi
CMD="'$DIR/openwhisk-utilities/scancode/scanCode.py' --config '$DIR/openwhisk-utilities/scancode/ASF-Release.cfg' $SCANCODE_EXTRA_ARGS '$DIR/$BASE'"
SC=$(eval $CMD >& /dev/null)
validate $? 0 "$CMD"

printf "scanning for executable files..."
EXE=$(find "$DIR/$BASE" -type f ! -name "*.sh" ! -name "*.sh" ! -name "*.py" ! -name "*.php" ! -name "gradlew" ! -name "gradlew.bat" ! -name "exec" ! -path "*/bin/*" -perm -001)
validate "$EXE" "" "$EXE"

printf "scanning for unexpected file types..."
EXE=$(find "$DIR/$BASE" -type f -exec file --mime {} \; | grep -v ": text/" | grep -v ": inode/x-empty" | grep -v ": image/")
validate "$EXE" "" "$EXE"

printf "scanning for archives..."
EXE=$(find "$DIR/$BASE" -type f -name "*.tar" -name "*.tgz" -o -name "*.gz" -o -name ".zip" -o -name "*.jar")
validate "$EXE" "" "$EXE"

printf "scanning for packages..."
EXE=$(find "$DIR/$BASE" -type d -name "node_modules" -o -name ".gradle")
validate "$EXE" "" "$EXE"

echo $(tput setaf 6)
echo run the following command to remove the scratch space:
echo "  rm -rf '$DIR'"
echo $(tput sgr0)