Decompile, edit, rebuild and sign .apk files to accept https analyses (e.g. Charles Proxy)

apk_edit.sh

#!/bin/bash

###########
# kernoeb #
###########

apk_dir=.apk_dir # name of the build apk
keystore=key.keystore # name of the keystore
apktool=apktool.jar # apktool.jar location
alias_name=alias_name # temporary alias name
application=application.apk # temporary file name

function cat_security {
echo -e "\e[32mAdding or replacing network_security_config file\e[39m"
cat > "res/xml/network_security_config.xml" << EOF
<network-security-config> 
  <debug-overrides> 
    <trust-anchors> 
      <!-- Trust user added CAs while debuggable only -->
      <certificates src="user" /> 
    </trust-anchors> 
  </debug-overrides> 
</network-security-config>
EOF
}

trap "exit" INT # Force stop on ctrl+c
if [ ! $# -eq 0 ]
then
	rm -rf "$apk_dir"
	if [ ! -f "$keystore" ]
	then
		echo -e "\e[32mPlease generate the key!\e[39m" 
		keytool -genkey -v -keystore "$keystore" -alias "$alias_name" -keyalg RSA -keysize 2048 -validity 10000
	else
		echo -e "\e[32mKey $keystore found!\e[39m" 
	fi
	echo -e "\e[32mDecompiling application...\e[39m"
	java -jar "$apktool" d "$1" -o "$apk_dir"
	cd "$apk_dir"
	cat_security

	if grep 'android:networkSecurityConfig="@xml/network_security_config"' "AndroidManifest.xml"
	then
		echo -e "\e[32mAlready here : networkSecurityConfig\e[39m"
	else
		echo -e "\e[32mEditing AndroidManifest.xml with networkSecurityConfig\e[39m"
		tmp1="<application "
		tmp2="<application android:networkSecurityConfig=\"@xml\/network_security_config\" "
		sed -i -e "s/${tmp1}/${tmp2}/g" "AndroidManifest.xml"
	fi

	cd ..
	echo -e "\e[32mRebuilding application\e[39m"
	java -jar "$apktool" b -f -d "$apk_dir" -o "$apk_dir"/dist/"$application"
	echo -e "\e[32mSign the application\e[39m"
	jarsigner -verbose -sigalg SHA1withRSA -digestalg SHA1 -keystore "$keystore" "$apk_dir"/dist/"$application" "$alias_name"
	echo -e "\e[32mAlign the application\e[39m"
	if [ -n "$2" ]; then
		if [ -f "$2" ]; then
			rm "$2"
		fi
		zipalign -v 4 "$apk_dir"/dist/"$application" "$2"
	else
		zipalign -v 4 "$apk_dir"/dist/"$application" "application-aligned.apk"
	fi
	if [ -n "$3" ] && [ "$3" = "keep" ]; then
		echo -e "\e[32mKeeping build directory\e[39m"
	else
		rm -rf "$apk_dir"
	fi
else
	echo -e "\e[91mEnter as an argument the path of the apk\e[39m"
	echo -e "\e[32m$0 /path/to/file.apk [new_name.apk] [keep]\e[39m"
	for i in `seq ${#0}`; do printf " ";done # just print spaces
	echo -e "                                   ↳ keep directory"
fi